dada-engine.org - User contributions [en]

Main Page/fr

2026-10-13T09:53:08Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<span id="Presentation"></span>
==Présentation==

Le moteur Dada est une machine thermique inversible, qui fait travailler un gaz en circuit fermé entre deux cylindres de volumes différents, à travers deux échangeurs thermiques sélectionnés par des clapets passifs, de manière à approcher un [https://fr.wikipedia.org/wiki/Cycle_de_Brayton cycle de Brayton/Joule]. Il peut aussi bien servir de moteur à chaleur externe que de pompe à chaleur. Le gaz de travail peut être inerte : hélium, azote, ou de l’air.

{{Webp|Crankcooler|1200}}

Il peut être considéré comme une variante du moteur Ericsson à cycle fermé sans régénérateur. Ses particularités résident dans sa cinématique et son architecture hydraulique spécifiquement arrangées. Chaque cylindre joue un rôle prépondérant durant le cycle, mais l'autre piston peut intervenir lors de la compression ou de la détente, permettant ainsi aux deux volumes balayés de contribuer aux variations de pression. Les clapets passifs ne séparent pas les échangeurs thermiques des cylindres, compressions et détentes agissent sur l'ensemble du système.

Durant son cycle la machine réalise une compression et une détente, entrecoupées de phases d’échanges thermiques idéalement isobares. Les clapets déterminent le sens de circulation dans les échangeurs. Entre la fin de la compression et le début de la détente, la totalité du gaz passe à travers l’échangeur chaud. Pendant la détente et jusqu’au début de la compression la totalité du gaz traverse l’échangeur froid.

Sur un principe proche existe depuis deux siècles le [https://fr.wikipedia.org/wiki/Moteur_Stirling moteur Stirling], ce dernier réalise les transferts thermiques au niveau des cylindres, l’idée ici est de transférer la chaleur quand le gaz passe d’un cylindre à l’autre.

Les échangeurs thermiques sont un élément clé de cette machine, ils doivent offrir une surface d’échange maximale pour un volume interne et des pertes de charges minimales. Pour l’instant seuls des échangeurs à microtubes ont été envisagés, mais les échangeurs à microcannaux semblent prometteurs, particulièrement s’ils peuvent remplacer des clapets mobiles à l’aide d’un profil de valve Tesla.

Les cylindres et pistons sont conçus dans un matériau faiblement conducteur de chaleur. La cinématique des pistons peut être assurée par différents procédés, atteindre un rendement maximal demande un mouvement complexe qui peut être fidèlement approché avec un assemblage 6 barres, et un simple système bielle-manivelle permettra un fonctionnement avec un rendement dégradé. Pour un usage en réfrigération de nombreux mécanismes sont envisageables comme cames, vérins, solénoïdes, pistons liquides …

Il n’existe pas encore de prototype du moteur Dada. Une [[Thermodynamic_and_Mechanical_Study/fr|étude thermodynamique et mécanique complète]] a été réalisée, et a servi de base à la conception d’un [[Dada_Engine_Solver/fr|simulateur 0D]]. C’est un projet ouvert et libre, toute aide est bienvenue.

<span id="Motor_cycle"></span>
==Cycle moteur==

{{Webp|Motor cycle|640}}

===Phase I — échange basse pression, idéalement isobare===
La quasi-totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur froid, de la chaleur est extraite du gaz, son volume et sa température diminuent.

===Phase II — Compression, idéalement adiabatique===
Le grand cylindre se ferme complètement, le petit cylindre compresse le gaz, le volume diminue, pression et température augmentent.

===Phase III — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du petit cylindre vers le grand cylindre à travers l’échangeur chaud, il absorbe de la chaleur, son volume et sa température augmentent.

===Phase IV — Détente, idéalement adiabatique===
Le grand cylindre s’ouvre entièrement, le petit cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

<span id="Receiver_cycle_(heat_pump,_refrigerator)"></span>
==Cycle récepteur (pompe à chaleur, réfrigérateur)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, idéalement adiabatique===
Le petit cylindre se ferme complètement, le grand cylindre se ferme partiellement, le volume diminue, pression et température augmentent.

===Phase II — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur chaud, le gaz y cède de la chaleur, son volume et sa température diminuent.

===Phase III — Détente, idéalement adiabatique===
Le petit cylindre s’ouvre entièrement, le grand cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

===Phase IV — échange basse pression, idéalement isobare===
la quasi-totalité du gaz est transféréé du petit cylindre au grand cylindre à travers l’échangeur froid, le gaz y absorbe de la chaleur, son volume et sa température augmentent.

<span id="Way_to_a_real_machine"></span>
==Vers une machine réelle==

Dans le moteur Dada les échangeurs thermiques restent actifs tout au long du cycle, compression et détente ne peuvent pas être parfaitement adiabatiques. Afin de limiter les irréversibilités ces phases doivent être brèves par rapport aux constantes de temps thermiques, les volumes morts et volumes internes des échangeurs seront ajustés au minimum.

Les transferts à travers les échangeurs engendrent des pertes de charge, l’isobare parfait est irréalisable. Afin de limiter ces pertes la durée des transferts est allongée de manière à limiter le débit, et les échangeurs doivent opposer le moins possible de résistance au passage du gaz.

Une étude thermodynamique complète du cycle a été réalisée à l’aide d’un usage massif de l’IA. J’ai appris beaucoup de choses au cours de cette écriture, et bien que ce travail me semble rigoureux il nécessite une relecture : [[Thermodynamic_and_Mechanical_Study/fr|Étude thermodynamique et mécanique]].

À partir des équations établies dans cette étude, un simulateur 0D a été développé en Python (entièrement par IA, y compris la documentation) afin de rechercher les dimensions et paramètres optimaux de cette machine dans différentes configurations : [[Dada_Engine_Solver/fr|Dada Engine Solver]]. Je l’ai utilisé pour dimensionner une [[Pedal_Cooling_Cell/fr|cellule de refroidissement]] utilisant de l'air comme gaz de travail et actionnée par pédalier. Je prévois de dimensionner un petit moteur de démonstration à air dans les prochaines semaines, puis une pompe à chaleur et un moteur utilisant l'hélium comme gaz de travail.

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Main Page/en

2026-10-13T09:40:10Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
==Presentation==

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

{{Webp|Crankcooler|1200}}

It can be regarded as a variant of the closed-cycle [https://en.wikipedia.org/wiki/Ericsson_cycle Ericsson engine] without a regenerator. Its distinctions lies in the specifically arranged kinematics, and hydraulic architecture. Each cylinder has a dominant role during the cycle, but the other piston may assist during compression or expansion, allowing both swept volumes to contribute to the pressure-changing phases. Passive valves do not separate heat exchangers from the cylinders, compressions and expansions act on the whole system.

During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

On a slightly similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another.

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. Although only microtubes have been studied so far, microchannel heat exchangers are a promising avenue to explore, particularly if they can act as a valve by adopting a Tesla valve profile.

The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be done using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, liquid pistons, etc.

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[Dada_Engine_Solver|0D simulator]]. This is a free open-source project, any help is welcome.

==Motor cycle==

{{Webp|Motor cycle|640}}

===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.

===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.

===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.

===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.

==Receiver cycle (heat pump, refrigerator)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

==Way to a real machine==

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a [[Pedal_Cooling_Cell|cooling cell]] using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

== Is it free? ==

Totally! The description of this invention is published here under [https://creativecommons.org/publicdomain/zero/1.0/deed.en Creative Commons Zero] license, however I cannot guarantee that all or part of this machine is not currently protected by a patent.

I sincerely hope that this idea will help reduce greenhouse gases emissions, and I'm convinced that making it free is the best thing I can do to facilitate its development and rapid spread.

== You can help! ==

By contributing with your ideas, knowledge, translations, corrections to the wiki; and also links to your work in case you don't want to contribute under the CC0 license.

Just register and edit.

You can also make a donation.

Main Page/fr

2026-10-13T09:40:08Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<span id="Presentation"></span>
==Présentation==

Le moteur Dada est une machine thermique inversible, qui fait travailler un gaz en circuit fermé entre deux cylindres de volumes différents, à travers deux échangeurs thermiques sélectionnés par des clapets passifs, de manière à approcher un [https://fr.wikipedia.org/wiki/Cycle_de_Brayton cycle de Brayton/Joule]. Il peut aussi bien servir de moteur à chaleur externe que de pompe à chaleur. Le gaz de travail peut être inerte : hélium, azote, ou de l’air.

{{Webp|Crankcooler|1200}}

<div lang="en" dir="ltr" class="mw-content-ltr">
It can be regarded as a variant of the closed-cycle [https://en.wikipedia.org/wiki/Ericsson_cycle Ericsson engine] without a regenerator. Its distinctions lies in the specifically arranged kinematics, and hydraulic architecture. Each cylinder has a dominant role during the cycle, but the other piston may assist during compression or expansion, allowing both swept volumes to contribute to the pressure-changing phases. Passive valves do not separate heat exchangers from the cylinders, compressions and expansions act on the whole system.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.
</div>

<div class="mw-translate-fuzzy">
Sur un principe proche existe depuis deux siècles le [https://fr.wikipedia.org/wiki/Moteur_Stirling moteur Stirling], ce dernier réalise les transferts thermiques au niveau des cylindres, l’idée ici est de transférer la chaleur quand le gaz passe d’un cylindre à l’autre. Durant son cycle la machine réalise une compression et une détente, entrecoupées de phases d’échanges thermiques idéalement isobares. Les clapets déterminent le sens de circulation dans les échangeurs. Entre la fin de la compression et le début de la détente, la totalité du gaz passe à travers l’échangeur chaud. Pendant la détente et jusqu’au début de la compression la totalité du gaz traverse l’échangeur froid.
</div>

<div class="mw-translate-fuzzy">
Les échangeurs thermiques sont un élément clé de cette machine, ils doivent offrir une surface d’échange maximale pour un volume interne et des pertes de charges minimales. Pour l’instant seuls des échangeurs à microtubes ont été envisagés. Les cylindres et pistons sont conçus dans un matériau faiblement conducteur de chaleur. La cinématique des pistons peut être assurée par différents procédés, atteindre un rendement maximal demande un mouvement complexe qui peut être fidèlement approché avec un assemblage 6 barres, et un simple système bielle-manivelle permettra un fonctionnement avec un rendement dégradé. Pour un usage en réfrigération de nombreux mécanismes sont envisageables comme cames, vérins, solénoïdes …
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be done using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, liquid pistons, etc.
</div>

<div class="mw-translate-fuzzy">
Il n’existe pas encore de prototype du moteur Dada. Une [[Thermodynamic_and_Mechanical_Study/fr|étude thermodynamique et mécanique complète]] a été réalisée, et a servi de base à la conception d’un [[Dada_Engine_Solver/fr|simulateur 0D]]. C’est un projet ouvert et libre, toute aide est bienvenue.
</div>

<span id="Motor_cycle"></span>
==Cycle moteur==

{{Webp|Motor cycle|640}}

===Phase I — échange basse pression, idéalement isobare===
La quasi-totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur froid, de la chaleur est extraite du gaz, son volume et sa température diminuent.

===Phase II — Compression, idéalement adiabatique===
Le grand cylindre se ferme complètement, le petit cylindre compresse le gaz, le volume diminue, pression et température augmentent.

===Phase III — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du petit cylindre vers le grand cylindre à travers l’échangeur chaud, il absorbe de la chaleur, son volume et sa température augmentent.

===Phase IV — Détente, idéalement adiabatique===
Le grand cylindre s’ouvre entièrement, le petit cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

<span id="Receiver_cycle_(heat_pump,_refrigerator)"></span>
==Cycle récepteur (pompe à chaleur, réfrigérateur)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, idéalement adiabatique===
Le petit cylindre se ferme complètement, le grand cylindre se ferme partiellement, le volume diminue, pression et température augmentent.

===Phase II — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur chaud, le gaz y cède de la chaleur, son volume et sa température diminuent.

===Phase III — Détente, idéalement adiabatique===
Le petit cylindre s’ouvre entièrement, le grand cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

===Phase IV — échange basse pression, idéalement isobare===
la quasi-totalité du gaz est transféréé du petit cylindre au grand cylindre à travers l’échangeur froid, le gaz y absorbe de la chaleur, son volume et sa température augmentent.

<span id="Way_to_a_real_machine"></span>
==Vers une machine réelle==

Dans le moteur Dada les échangeurs thermiques restent actifs tout au long du cycle, compression et détente ne peuvent pas être parfaitement adiabatiques. Afin de limiter les irréversibilités ces phases doivent être brèves par rapport aux constantes de temps thermiques, les volumes morts et volumes internes des échangeurs seront ajustés au minimum.

Les transferts à travers les échangeurs engendrent des pertes de charge, l’isobare parfait est irréalisable. Afin de limiter ces pertes la durée des transferts est allongée de manière à limiter le débit, et les échangeurs doivent opposer le moins possible de résistance au passage du gaz.

Une étude thermodynamique complète du cycle a été réalisée à l’aide d’un usage massif de l’IA. J’ai appris beaucoup de choses au cours de cette écriture, et bien que ce travail me semble rigoureux il nécessite une relecture : [[Thermodynamic_and_Mechanical_Study/fr|Étude thermodynamique et mécanique]].

À partir des équations établies dans cette étude, un simulateur 0D a été développé en Python (entièrement par IA, y compris la documentation) afin de rechercher les dimensions et paramètres optimaux de cette machine dans différentes configurations : [[Dada_Engine_Solver/fr|Dada Engine Solver]]. Je l’ai utilisé pour dimensionner une [[Pedal_Cooling_Cell/fr|cellule de refroidissement]] utilisant de l'air comme gaz de travail et actionnée par pédalier. Je prévois de dimensionner un petit moteur de démonstration à air dans les prochaines semaines, puis une pompe à chaleur et un moteur utilisant l'hélium comme gaz de travail.

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Translations:Main Page/80/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[Dada_Engine_Solver|0D simulator]]. This is a free open-source project, any help is welcome.

Translations:Main Page/100/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be done using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, liquid pistons, etc.

Translations:Main Page/79/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. Although only microtubes have been studied so far, microchannel heat exchangers are a promising avenue to explore, particularly if they can act as a valve by adopting a Tesla valve profile.

Translations:Main Page/78/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

On a slightly similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another.

Translations:Main Page/99/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

Translations:Main Page/98/en

2026-10-13T09:40:07Z

FuzzyBot: Importing a new version from external source

It can be regarded as a variant of the closed-cycle [https://en.wikipedia.org/wiki/Ericsson_cycle Ericsson engine] without a regenerator. Its distinctions lies in the specifically arranged kinematics, and hydraulic architecture. Each cylinder has a dominant role during the cycle, but the other piston may assist during compression or expansion, allowing both swept volumes to contribute to the pressure-changing phases. Passive valves do not separate heat exchangers from the cylinders, compressions and expansions act on the whole system.

Pedal Cooling Cell/en

2026-10-13T07:14:38Z

FuzzyBot: Updating to match new version of source page

__NOTOC__
This page presents an example of a model created using dada-engine-solver, you can find it in the folder [https://github.com/99epep/dada-engine-solver/tree/master/examples/pedal_cooling_cell examples/pedal_cooling_cell/]. This research has not been carried out in sufficient depth to claim that it provides an optimal result.

The aim is to size the motor for a low-tech cooling cell driven by a pedal mechanism. The working gas is air, the initial load corresponds to a pressure of 1 bar when the machine is in its maximum volume position. The target power for the input work is 150W, the work required to circulate the external heat-transfer fluids, as well as mechanical losses, have not been estimated.

A few tests have shown that the maximum speed is reached quickly, and efficiency is at its highest when the frequency approaches 0, at the expense of power. A frequency of 1.4 Hz is recognised as comfortable for pedalling, ideally a machine operating at 2.8 Hz would have benefit from one pedal stroke per compression, but I haven’t found a solution at those frequencies. I did, however, find a solution at 0.933 Hz, which equates to one compression every three pedal strokes, that might be acceptable with a suitable flywheel.

Sources temperatures were set at 25°C for the hot source and -15°C for the cold source, with the aim of producing ice. The wiped volumes of the cylinders are approximately 14.2 and 10.8 l. Each microtube heat exchangers consist of approximately 220 tubes with an internal diameter of 3 mm, measuring approximately 48 cm in length for the hot exchanger and 31 cm for the cold exchanger. Simulations show that efficiency improves by increasing the number of tubes, combined with a reduction in their length and internal diameter, which takes us away from the low-tech objective.

I achieved a COP of 1.64, equivalent to 25% of the Carnot COP, by operating this configuration using a synthetic law of motion. This is a purely thermodynamic COP, the only losses taken into account are the pressure drops in the heat exchangers.

I then adapted mechanical assemblies to approximate this law of motion, before optimising these mechanisms by seeking the maximum COP they could produce in this configuration, I subsequently sought further optimisation by jointly modifying both the mechanism and the thermodynamic component, which explains the final differences in dimensions. The maximum coefficients obtained with the slider-crank, 4-bar and 6-bar linkage mechanisms are 1.53, 1.57 and 1.6 respectively.

Below are animations of the three mechanisms tested, along with a link to the detailed HTML report generated by the software, you’ll have to download the file and open it from your drive. The mechanisms were deliberately chosen asymmetrical in order to give an idea of the variety of possible solutions.

{{Webp|Crankcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/slider/slider_coolcell.html Slider-crank html report]

{{Webp|Fourbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/fourbar/fourbar_coolcell.html Four bar html report]

{{Webp|Sixbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/sixbar/sixbar_coolcell.html Six bar html report]

Pedal Cooling Cell/fr

2026-10-13T07:14:33Z

FuzzyBot: Updating to match new version of source page

__NOTOC__
Cette page présente un exemple de modélisation réalisée avec dada-engine-solver, vous le trouverez dans le dossier [https://github.com/99epep/dada-engine-solver/tree/master/examples/pedal_cooling_cell examples/pedal_cooling_cell/]. Cette recherche n’a pas été suffisamment approfondie pour prétendre fournir un résultat optimal.

L’objectif est de dimensionner le moteur d’une cellule de refroidissement low-tech actionnable par pédalier. Le gaz de travail est de l’air, la charge initiale correspond à une pression de 1 bar lorsque la machine est dans sa position de volume maximal. La puissance visée pour le travail d’entrée est de 150W, le travail nécessaire pour la circulation des fluides caloporteurs externes ainsi que les pertes mécaniques n’ont pas été estimés.

<div class="mw-translate-fuzzy">
Quelques essais m’ont montré que la vitesse maximale est vite atteinte, et le rendement est maximal quand la fréquence tend vers 0, au détriment de la puissance. La fréquence de 1,4Hz est reconnue comme confortable pour le pédalage, l’idéal aurait été une machine fonctionnant à 2,8Hz pour bénéficier d’un coup de pédale par compression, mais je n’ai pas trouvé de solution à ces fréquences là. J’en ai trouvé à 0,933Hz, soit une compression tous les 3 coups de pédale, ce qui pourrait être acceptable avec une roue d’inertie adaptée.
</div>

Les températures des sources ont été fixées à 25°C pour la source chaude, et -15°C pour la source froide dans le but de produire de la glace. Les volumes balayés des cylindres sont d’environ 14,2 et 10,8 l. Les échangeurs thermiques à microtubes sont constitués chacun d’environ 220 tubes de 3 mm de diamètre intérieur, longs d’environ 48 cm pour l’échangeur chaud et 31 cm pour l’échangeur froid. Les simulations montrent que le rendement s’améliore par la multiplication du nombre de tubes, combiné à la diminution de leur longueur et diamètre intérieur, ce qui nous éloigne de l’objectif low-tech.

J’ai obtenu un COP de 1,64 soit 25% du COP de Carnot en actionnant cette configuration avec une loi de mouvement synthétique. C’est un COP thermodynamique pur, les seules pertes comptabilisées sont les pertes de charge dans les échangeurs.

J’ai ensuite adapté des assemblages mécaniques pour approcher cette loi de mouvement, puis optimisé ces mécanismes en cherchant le COP maximal qu’ils peuvent produire sur cette configuration, et encore cherché à optimiser en modifiant conjointement le mécanisme et la partie thermodynamique, ce qui explique les différences dimensionnelles finales. Les coefficients maximaux qui ont été obtenus avec les mécanismes bielle-manivelle, 4 barres, 6 barres, sont respectivement de 1,53 1,57 et 1,6.

Ci-dessous les animations des 3 mécanismes testés, accompagnées d’un lien vers le rapport html détaillé généré par le logiciel, vous devez télécharger le fichier pour l’ouvrir depuis votre disque. Les mécanismes ont volontairement été sélectionnés assymétriques pour donner une idée de la variété de solutions envisageables.

{{Webp|crankcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/slider/slider_coolcell.html Rapport html bielle-manivelle]

{{Webp|fourbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/fourbar/fourbar_coolcell.html Rapport html 4 barres]

{{Webp|sixbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/sixbar/sixbar_coolcell.html Rapport html 6 barres]

Translations:Pedal Cooling Cell/3/en

2026-10-13T07:14:32Z

FuzzyBot: Importing a new version from external source

A few tests have shown that the maximum speed is reached quickly, and efficiency is at its highest when the frequency approaches 0, at the expense of power. A frequency of 1.4 Hz is recognised as comfortable for pedalling, ideally a machine operating at 2.8 Hz would have benefit from one pedal stroke per compression, but I haven’t found a solution at those frequencies. I did, however, find a solution at 0.933 Hz, which equates to one compression every three pedal strokes, that might be acceptable with a suitable flywheel.

Dada Engine Solver/en

2026-10-11T01:51:02Z

FuzzyBot: Updating to match new version of source page

[https://github.com/99epep/dada-engine-solver https://github.com/99epep/dada-engine-solver]

[https://github.com/99epep/dada-engine-solver DADA Engine Solver] is a [https://www.gnu.org/licenses/gpl-3.0.en.html GPL-licensed] research tool dedicated to the thermodynamic simulation and optimization of the Dada engine.

The software enables thermodynamic modelling, mechanical synthesis, heat exchanger design and numerical optimization within a modular architecture. It allows users to investigate how different piston motion laws, mechanical linkages and thermal configurations influence machine performance.

The project includes comprehensive technical documentation, automated tests and [[Pedal_Cooling_Cell|reproducible examples]] accompanied by HTML reports displaying animated mechanisms.

This simulator does not yet verify a technology that has been experimentally validated. Its physical assumptions, numerical limitations and validation constraints are explicitly documented. Optimization results represent the best solutions found within the framework of the chosen models and constraints, not proven global optima.

This software is made available to encourage scientific exploration, independent verification and further development. Future progress will focus on additional examples, improved physical models and experimental validation as resources become available.

Dada Engine Solver/fr

2026-10-11T01:51:02Z

FuzzyBot: Updating to match new version of source page

[https://github.com/99epep/dada-engine-solver https://github.com/99epep/dada-engine-solver]

[https://github.com/99epep/dada-engine-solver DADA Engine Solver] est un outil de recherche [https://www.gnu.org/licenses/gpl-3.0.fr.html GPL] dédié à la simulation thermodynamique et à l'optimisation de Dada engine.

Le logiciel permet la modélisation thermodynamique, la synthèse mécanique, la conception d’échangeurs de chaleur et l’optimisation numérique dans une architecture modulaire. Il permet d’étudier comment différentes lois de mouvement des pistons, liaisons mécaniques et configurations thermiques influencent les performances de la machine.

<div class="mw-translate-fuzzy">
Le projet comprend une documentation technique exhaustive, des tests automatisés et des exemples reproductibles accompagnés de rapports HTML affichant les mécanismes animés.
</div>

Ce simulateur ne vérifie pas encore une technologie validée expérimentalement. Ses hypothèses physiques, ses limites numériques et ses contraintes de validation sont explicitement documentées. Les résultats d’optimisation représentent les meilleures solutions trouvées dans le cadre des modèles et des contraintes choisis, et non des optimums globaux réels.

Ce logiciel est mis à disposition afin d’encourager l’exploration scientifique, la vérification indépendante et la poursuite du développement. Les progrès futurs porteront sur des exemples supplémentaires, l’amélioration des modèles physiques et la validation expérimentale, à mesure que les ressources seront disponibles.

Translations:Dada Engine Solver/3/en

2026-10-11T01:51:00Z

FuzzyBot: Importing a new version from external source

The project includes comprehensive technical documentation, automated tests and [[Pedal_Cooling_Cell|reproducible examples]] accompanied by HTML reports displaying animated mechanisms.

Main Page/fr

2026-10-11T01:42:23Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<span id="Presentation"></span>
==Présentation==

Le moteur Dada est une machine thermique inversible, qui fait travailler un gaz en circuit fermé entre deux cylindres de volumes différents, à travers deux échangeurs thermiques sélectionnés par des clapets passifs, de manière à approcher un [https://fr.wikipedia.org/wiki/Cycle_de_Brayton cycle de Brayton/Joule]. Il peut aussi bien servir de moteur à chaleur externe que de pompe à chaleur. Le gaz de travail peut être inerte : hélium, azote, ou de l’air.

{{Webp|Crankcooler|1200}}

Sur un principe proche existe depuis deux siècles le [https://fr.wikipedia.org/wiki/Moteur_Stirling moteur Stirling], ce dernier réalise les transferts thermiques au niveau des cylindres, l’idée ici est de transférer la chaleur quand le gaz passe d’un cylindre à l’autre. Durant son cycle la machine réalise une compression et une détente, entrecoupées de phases d’échanges thermiques idéalement isobares. Les clapets déterminent le sens de circulation dans les échangeurs. Entre la fin de la compression et le début de la détente, la totalité du gaz passe à travers l’échangeur chaud. Pendant la détente et jusqu’au début de la compression la totalité du gaz traverse l’échangeur froid.

Les échangeurs thermiques sont un élément clé de cette machine, ils doivent offrir une surface d’échange maximale pour un volume interne et des pertes de charges minimales. Pour l’instant seuls des échangeurs à microtubes ont été envisagés. Les cylindres et pistons sont conçus dans un matériau faiblement conducteur de chaleur. La cinématique des pistons peut être assurée par différents procédés, atteindre un rendement maximal demande un mouvement complexe qui peut être fidèlement approché avec un assemblage 6 barres, et un simple système bielle-manivelle permettra un fonctionnement avec un rendement dégradé. Pour un usage en réfrigération de nombreux mécanismes sont envisageables comme cames, vérins, solénoïdes …

Il n’existe pas encore de prototype du moteur Dada. Une [[Thermodynamic_and_Mechanical_Study/fr|étude thermodynamique et mécanique complète]] a été réalisée, et a servi de base à la conception d’un [[Dada_Engine_Solver/fr|simulateur 0D]]. C’est un projet ouvert et libre, toute aide est bienvenue.

<span id="Motor_cycle"></span>
==Cycle moteur==

{{Webp|Motor cycle|640}}

===Phase I — échange basse pression, idéalement isobare===
La quasi-totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur froid, de la chaleur est extraite du gaz, son volume et sa température diminuent.

===Phase II — Compression, idéalement adiabatique===
Le grand cylindre se ferme complètement, le petit cylindre compresse le gaz, le volume diminue, pression et température augmentent.

===Phase III — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du petit cylindre vers le grand cylindre à travers l’échangeur chaud, il absorbe de la chaleur, son volume et sa température augmentent.

===Phase IV — Détente, idéalement adiabatique===
Le grand cylindre s’ouvre entièrement, le petit cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

<span id="Receiver_cycle_(heat_pump,_refrigerator)"></span>
==Cycle récepteur (pompe à chaleur, réfrigérateur)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, idéalement adiabatique===
Le petit cylindre se ferme complètement, le grand cylindre se ferme partiellement, le volume diminue, pression et température augmentent.

===Phase II — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur chaud, le gaz y cède de la chaleur, son volume et sa température diminuent.

===Phase III — Détente, idéalement adiabatique===
Le petit cylindre s’ouvre entièrement, le grand cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

===Phase IV — échange basse pression, idéalement isobare===
la quasi-totalité du gaz est transféréé du petit cylindre au grand cylindre à travers l’échangeur froid, le gaz y absorbe de la chaleur, son volume et sa température augmentent.

<span id="Way_to_a_real_machine"></span>
==Vers une machine réelle==

Dans le moteur Dada les échangeurs thermiques restent actifs tout au long du cycle, compression et détente ne peuvent pas être parfaitement adiabatiques. Afin de limiter les irréversibilités ces phases doivent être brèves par rapport aux constantes de temps thermiques, les volumes morts et volumes internes des échangeurs seront ajustés au minimum.

Les transferts à travers les échangeurs engendrent des pertes de charge, l’isobare parfait est irréalisable. Afin de limiter ces pertes la durée des transferts est allongée de manière à limiter le débit, et les échangeurs doivent opposer le moins possible de résistance au passage du gaz.

Une étude thermodynamique complète du cycle a été réalisée à l’aide d’un usage massif de l’IA. J’ai appris beaucoup de choses au cours de cette écriture, et bien que ce travail me semble rigoureux il nécessite une relecture : [[Thermodynamic_and_Mechanical_Study/fr|Étude thermodynamique et mécanique]].

<div class="mw-translate-fuzzy">
À partir des équations établies dans cette étude, un simulateur 0D a été développé en Python (entièrement par IA, y compris la documentation) afin de rechercher les dimensions et paramètres optimaux de cette machine dans différentes configurations : [[Dada_Engine_Solver/fr|Dada Engine Solver]]. Je l’ai utilisé pour dimensionner une cellule de refroidissement utilisant de l'air comme gaz de travail et actionnée par pédalier. Je prévois de dimensionner un petit moteur de démonstration à air dans les prochaines semaines, puis une pompe à chaleur et un moteur utilisant l'hélium comme gaz de travail.
</div>

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Main Page/en

2026-10-11T01:42:23Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
==Presentation==

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

{{Webp|Crankcooler|1200}}

On a similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another. During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. So far, only microtube heat exchangers have been considered. The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be achieved using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, etc.

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[Dada_Engine_Solver|0D simulator]]. This is an open-source project, any help is welcome.

==Motor cycle==

{{Webp|Motor cycle|640}}

===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.

===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.

===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.

===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.

==Receiver cycle (heat pump, refrigerator)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

==Way to a real machine==

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a [[Pedal_Cooling_Cell|cooling cell]] using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

== Is it free? ==

Totally! The description of this invention is published here under [https://creativecommons.org/publicdomain/zero/1.0/deed.en Creative Commons Zero] license, however I cannot guarantee that all or part of this machine is not currently protected by a patent.

I sincerely hope that this idea will help reduce greenhouse gases emissions, and I'm convinced that making it free is the best thing I can do to facilitate its development and rapid spread.

== You can help! ==

By contributing with your ideas, knowledge, translations, corrections to the wiki; and also links to your work in case you don't want to contribute under the CC0 license.

Just register and edit.

You can also make a donation.

Translations:Main Page/97/en

2026-10-11T01:42:21Z

FuzzyBot: Importing a new version from external source

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a [[Pedal_Cooling_Cell|cooling cell]] using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

Pedal Cooling Cell/en

2026-10-11T00:35:14Z

FuzzyBot: Updating to match new version of source page

__NOTOC__
This page presents an example of a model created using dada-engine-solver, you can find it in the folder [https://github.com/99epep/dada-engine-solver/tree/master/examples/pedal_cooling_cell examples/pedal_cooling_cell/]. This research has not been carried out in sufficient depth to claim that it provides an optimal result.

The aim is to size the motor for a low-tech cooling cell driven by a pedal mechanism. The working gas is air, the initial load corresponds to a pressure of 1 bar when the machine is in its maximum volume position. The target power for the input work is 150W, the work required to circulate the external heat-transfer fluids, as well as mechanical losses, have not been estimated.

A few tests have shown me that the maximum speed is reached quickly, and efficiency is at its highest when the frequency approaches 0, at the expense of power. A frequency of 1.4 Hz is recognised as comfortable for pedalling, ideally a machine operating at 2.8 Hz would have benefit from one pedal stroke per compression, but I haven’t found a solution at those frequencies. I did, however, find a solution at 0.933 Hz, which equates to one compression every three pedal strokes, that might be acceptable with a suitable flywheel.

Sources temperatures were set at 25°C for the hot source and -15°C for the cold source, with the aim of producing ice. The wiped volumes of the cylinders are approximately 14.2 and 10.8 l. Each microtube heat exchangers consist of approximately 220 tubes with an internal diameter of 3 mm, measuring approximately 48 cm in length for the hot exchanger and 31 cm for the cold exchanger. Simulations show that efficiency improves by increasing the number of tubes, combined with a reduction in their length and internal diameter, which takes us away from the low-tech objective.

I achieved a COP of 1.64, equivalent to 25% of the Carnot COP, by operating this configuration using a synthetic law of motion. This is a purely thermodynamic COP, the only losses taken into account are the pressure drops in the heat exchangers.

I then adapted mechanical assemblies to approximate this law of motion, before optimising these mechanisms by seeking the maximum COP they could produce in this configuration, I subsequently sought further optimisation by jointly modifying both the mechanism and the thermodynamic component, which explains the final differences in dimensions. The maximum coefficients obtained with the slider-crank, 4-bar and 6-bar linkage mechanisms are 1.53, 1.57 and 1.6 respectively.

Below are animations of the three mechanisms tested, along with a link to the detailed HTML report generated by the software, you’ll have to download the file and open it from your drive. The mechanisms were deliberately chosen asymmetrical in order to give an idea of the variety of possible solutions.

{{Webp|Crankcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/slider/slider_coolcell.html Slider-crank html report]

{{Webp|Fourbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/fourbar/fourbar_coolcell.html Four bar html report]

{{Webp|Sixbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/sixbar/sixbar_coolcell.html Six bar html report]

Translations:Pedal Cooling Cell/10/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

{{Webp|Sixbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/sixbar/sixbar_coolcell.html Six bar html report]

Translations:Pedal Cooling Cell/9/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

{{Webp|Fourbarcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/fourbar/fourbar_coolcell.html Four bar html report]

Translations:Pedal Cooling Cell/8/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

{{Webp|Crankcooler|1200}}
[https://github.com/99epep/dada-engine-solver/blob/master/examples/pedal_cooling_cell/slider/slider_coolcell.html Slider-crank html report]

Translations:Pedal Cooling Cell/7/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

Below are animations of the three mechanisms tested, along with a link to the detailed HTML report generated by the software, you’ll have to download the file and open it from your drive. The mechanisms were deliberately chosen asymmetrical in order to give an idea of the variety of possible solutions.

Translations:Pedal Cooling Cell/6/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

I then adapted mechanical assemblies to approximate this law of motion, before optimising these mechanisms by seeking the maximum COP they could produce in this configuration, I subsequently sought further optimisation by jointly modifying both the mechanism and the thermodynamic component, which explains the final differences in dimensions. The maximum coefficients obtained with the slider-crank, 4-bar and 6-bar linkage mechanisms are 1.53, 1.57 and 1.6 respectively.

Translations:Pedal Cooling Cell/5/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

I achieved a COP of 1.64, equivalent to 25% of the Carnot COP, by operating this configuration using a synthetic law of motion. This is a purely thermodynamic COP, the only losses taken into account are the pressure drops in the heat exchangers.

Translations:Pedal Cooling Cell/4/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

Sources temperatures were set at 25°C for the hot source and -15°C for the cold source, with the aim of producing ice. The wiped volumes of the cylinders are approximately 14.2 and 10.8 l. Each microtube heat exchangers consist of approximately 220 tubes with an internal diameter of 3 mm, measuring approximately 48 cm in length for the hot exchanger and 31 cm for the cold exchanger. Simulations show that efficiency improves by increasing the number of tubes, combined with a reduction in their length and internal diameter, which takes us away from the low-tech objective.

Translations:Pedal Cooling Cell/3/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

A few tests have shown me that the maximum speed is reached quickly, and efficiency is at its highest when the frequency approaches 0, at the expense of power. A frequency of 1.4 Hz is recognised as comfortable for pedalling, ideally a machine operating at 2.8 Hz would have benefit from one pedal stroke per compression, but I haven’t found a solution at those frequencies. I did, however, find a solution at 0.933 Hz, which equates to one compression every three pedal strokes, that might be acceptable with a suitable flywheel.

Translations:Pedal Cooling Cell/2/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

The aim is to size the motor for a low-tech cooling cell driven by a pedal mechanism. The working gas is air, the initial load corresponds to a pressure of 1 bar when the machine is in its maximum volume position. The target power for the input work is 150W, the work required to circulate the external heat-transfer fluids, as well as mechanical losses, have not been estimated.

Translations:Pedal Cooling Cell/1/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

This page presents an example of a model created using dada-engine-solver, you can find it in the folder [https://github.com/99epep/dada-engine-solver/tree/master/examples/pedal_cooling_cell examples/pedal_cooling_cell/]. This research has not been carried out in sufficient depth to claim that it provides an optimal result.

Translations:Pedal Cooling Cell/Page display title/en

2026-10-11T00:35:12Z

FuzzyBot: Importing a new version from external source

Pedal Cooling Cell

Dada Engine Solver/fr

2026-10-10T17:34:33Z

FuzzyBot: Updating to match new version of source page

[https://github.com/99epep/dada-engine-solver https://github.com/99epep/dada-engine-solver]

[https://github.com/99epep/dada-engine-solver DADA Engine Solver] est un outil de recherche [https://www.gnu.org/licenses/gpl-3.0.fr.html GPL] dédié à la simulation thermodynamique et à l'optimisation de Dada engine.

Le logiciel permet la modélisation thermodynamique, la synthèse mécanique, la conception d’échangeurs de chaleur et l’optimisation numérique dans une architecture modulaire. Il permet d’étudier comment différentes lois de mouvement des pistons, liaisons mécaniques et configurations thermiques influencent les performances de la machine.

Le projet comprend une documentation technique exhaustive, des tests automatisés et des exemples reproductibles accompagnés de rapports HTML affichant les mécanismes animés.

Ce simulateur ne vérifie pas encore une technologie validée expérimentalement. Ses hypothèses physiques, ses limites numériques et ses contraintes de validation sont explicitement documentées. Les résultats d’optimisation représentent les meilleures solutions trouvées dans le cadre des modèles et des contraintes choisis, et non des optimums globaux réels.

Ce logiciel est mis à disposition afin d’encourager l’exploration scientifique, la vérification indépendante et la poursuite du développement. Les progrès futurs porteront sur des exemples supplémentaires, l’amélioration des modèles physiques et la validation expérimentale, à mesure que les ressources seront disponibles.

Dada Engine Solver/en

2026-10-10T17:34:32Z

FuzzyBot: Updating to match new version of source page

[https://github.com/99epep/dada-engine-solver https://github.com/99epep/dada-engine-solver]

[https://github.com/99epep/dada-engine-solver DADA Engine Solver] is a [https://www.gnu.org/licenses/gpl-3.0.en.html GPL-licensed] research tool dedicated to the thermodynamic simulation and optimization of the Dada engine.

The software enables thermodynamic modelling, mechanical synthesis, heat exchanger design and numerical optimization within a modular architecture. It allows users to investigate how different piston motion laws, mechanical linkages and thermal configurations influence machine performance.

The project includes comprehensive technical documentation, automated tests and reproducible examples accompanied by HTML reports displaying animated mechanisms.

This simulator does not yet verify a technology that has been experimentally validated. Its physical assumptions, numerical limitations and validation constraints are explicitly documented. Optimization results represent the best solutions found within the framework of the chosen models and constraints, not proven global optima.

This software is made available to encourage scientific exploration, independent verification and further development. Future progress will focus on additional examples, improved physical models and experimental validation as resources become available.

Main Page/en

2026-10-10T17:29:02Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
==Presentation==

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

{{Webp|Crankcooler|1200}}

On a similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another. During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. So far, only microtube heat exchangers have been considered. The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be achieved using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, etc.

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[Dada_Engine_Solver|0D simulator]]. This is an open-source project, any help is welcome.

==Motor cycle==

{{Webp|Motor cycle|640}}

===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.

===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.

===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.

===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.

==Receiver cycle (heat pump, refrigerator)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

==Way to a real machine==

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a cooling cell using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

== Is it free? ==

Totally! The description of this invention is published here under [https://creativecommons.org/publicdomain/zero/1.0/deed.en Creative Commons Zero] license, however I cannot guarantee that all or part of this machine is not currently protected by a patent.

I sincerely hope that this idea will help reduce greenhouse gases emissions, and I'm convinced that making it free is the best thing I can do to facilitate its development and rapid spread.

== You can help! ==

By contributing with your ideas, knowledge, translations, corrections to the wiki; and also links to your work in case you don't want to contribute under the CC0 license.

Just register and edit.

You can also make a donation.

Main Page/fr

2026-10-10T17:28:59Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<span id="Presentation"></span>
==Présentation==

<div class="mw-translate-fuzzy">
Le moteur Dada est une machine thermique inversible, qui fait travailler un gaz en circuit fermé entre deux cylindres de volumes différents, à travers deux échangeurs thermiques sélectionnés par des clapets passifs, de manière à approcher un [[https://fr.wikipedia.org/wiki/Cycle_de_Brayton cycle de Brayton/Joule]]. Il peut aussi bien servir de moteur à chaleur externe que de pompe à chaleur. Le gaz de travail peut être inerte : hélium, azote, ou de l’air.
</div>

{{Webp|Crankcooler|1200}}

Sur un principe proche existe depuis deux siècles le [https://fr.wikipedia.org/wiki/Moteur_Stirling moteur Stirling], ce dernier réalise les transferts thermiques au niveau des cylindres, l’idée ici est de transférer la chaleur quand le gaz passe d’un cylindre à l’autre. Durant son cycle la machine réalise une compression et une détente, entrecoupées de phases d’échanges thermiques idéalement isobares. Les clapets déterminent le sens de circulation dans les échangeurs. Entre la fin de la compression et le début de la détente, la totalité du gaz passe à travers l’échangeur chaud. Pendant la détente et jusqu’au début de la compression la totalité du gaz traverse l’échangeur froid.

Les échangeurs thermiques sont un élément clé de cette machine, ils doivent offrir une surface d’échange maximale pour un volume interne et des pertes de charges minimales. Pour l’instant seuls des échangeurs à microtubes ont été envisagés. Les cylindres et pistons sont conçus dans un matériau faiblement conducteur de chaleur. La cinématique des pistons peut être assurée par différents procédés, atteindre un rendement maximal demande un mouvement complexe qui peut être fidèlement approché avec un assemblage 6 barres, et un simple système bielle-manivelle permettra un fonctionnement avec un rendement dégradé. Pour un usage en réfrigération de nombreux mécanismes sont envisageables comme cames, vérins, solénoïdes …

<div class="mw-translate-fuzzy">
Il n’existe pas encore de prototype du moteur Dada. Une [[Thermodynamic_and_Mechanical_Study/fr|étude thermodynamique et mécanique complète]] a été réalisée, et a servi de base à la conception d’un [[Dada_Engine_Solver/fr|simulateur 0D]]. C’est un projet ouvert et libre, toute aide est bienvenue.
</div>

<span id="Motor_cycle"></span>
==Cycle moteur==

{{Webp|Motor cycle|640}}

===Phase I — échange basse pression, idéalement isobare===
La quasi-totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur froid, de la chaleur est extraite du gaz, son volume et sa température diminuent.

===Phase II — Compression, idéalement adiabatique===
Le grand cylindre se ferme complètement, le petit cylindre compresse le gaz, le volume diminue, pression et température augmentent.

===Phase III — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du petit cylindre vers le grand cylindre à travers l’échangeur chaud, il absorbe de la chaleur, son volume et sa température augmentent.

===Phase IV — Détente, idéalement adiabatique===
Le grand cylindre s’ouvre entièrement, le petit cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

<span id="Receiver_cycle_(heat_pump,_refrigerator)"></span>
==Cycle récepteur (pompe à chaleur, réfrigérateur)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, idéalement adiabatique===
Le petit cylindre se ferme complètement, le grand cylindre se ferme partiellement, le volume diminue, pression et température augmentent.

===Phase II — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur chaud, le gaz y cède de la chaleur, son volume et sa température diminuent.

===Phase III — Détente, idéalement adiabatique===
Le petit cylindre s’ouvre entièrement, le grand cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

===Phase IV — échange basse pression, idéalement isobare===
la quasi-totalité du gaz est transféréé du petit cylindre au grand cylindre à travers l’échangeur froid, le gaz y absorbe de la chaleur, son volume et sa température augmentent.

<span id="Way_to_a_real_machine"></span>
==Vers une machine réelle==

Dans le moteur Dada les échangeurs thermiques restent actifs tout au long du cycle, compression et détente ne peuvent pas être parfaitement adiabatiques. Afin de limiter les irréversibilités ces phases doivent être brèves par rapport aux constantes de temps thermiques, les volumes morts et volumes internes des échangeurs seront ajustés au minimum.

Les transferts à travers les échangeurs engendrent des pertes de charge, l’isobare parfait est irréalisable. Afin de limiter ces pertes la durée des transferts est allongée de manière à limiter le débit, et les échangeurs doivent opposer le moins possible de résistance au passage du gaz.

Une étude thermodynamique complète du cycle a été réalisée à l’aide d’un usage massif de l’IA. J’ai appris beaucoup de choses au cours de cette écriture, et bien que ce travail me semble rigoureux il nécessite une relecture : [[Thermodynamic_and_Mechanical_Study/fr]].

À partir des équations établies dans cette étude, un simulateur 0D a été développé en Python (entièrement par IA, y compris la documentation) afin de rechercher les dimensions et paramètres optimaux de cette machine dans différentes configurations : [[Dada_Engine_Solver/fr]]. Je l’ai utilisé pour dimensionner une cellule de refroidissement utilisant de l'air comme gaz de travail et actionnée par pédalier. Je prévois de dimensionner un petit moteur de démonstration à air dans les prochaines semaines, puis une pompe à chaleur et un moteur utilisant l'hélium comme gaz de travail.

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Translations:Main Page/76/en

2026-10-10T17:28:59Z

FuzzyBot: Importing a new version from external source

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

Main Page/fr

2026-10-10T17:25:15Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<span id="Presentation"></span>
==Présentation==

<div class="mw-translate-fuzzy">
Le moteur Dada est une machine thermique inversible, qui fait travailler un gaz en circuit fermé entre deux cylindres de volumes différents, à travers deux échangeurs thermiques sélectionnés par des clapets passifs, de manière à approcher un [[https://fr.wikipedia.org/wiki/Cycle_de_Brayton cycle de Brayton/Joule]]. Il peut aussi bien servir de moteur à chaleur externe que de pompe à chaleur. Le gaz de travail peut être inerte : hélium, azote, ou de l’air.
</div>

{{Webp|Crankcooler|1200}}

Sur un principe proche existe depuis deux siècles le [[https://fr.wikipedia.org/wiki/Moteur_Stirling moteur Stirling]], ce dernier réalise les transferts thermiques au niveau des cylindres, l’idée ici est de transférer la chaleur quand le gaz passe d’un cylindre à l’autre. Durant son cycle la machine réalise une compression et une détente, entrecoupées de phases d’échanges thermiques idéalement isobares. Les clapets déterminent le sens de circulation dans les échangeurs. Entre la fin de la compression et le début de la détente, la totalité du gaz passe à travers l’échangeur chaud. Pendant la détente et jusqu’au début de la compression la totalité du gaz traverse l’échangeur froid.

Les échangeurs thermiques sont un élément clé de cette machine, ils doivent offrir une surface d’échange maximale pour un volume interne et des pertes de charges minimales. Pour l’instant seuls des échangeurs à microtubes ont été envisagés. Les cylindres et pistons sont conçus dans un matériau faiblement conducteur de chaleur. La cinématique des pistons peut être assurée par différents procédés, atteindre un rendement maximal demande un mouvement complexe qui peut être fidèlement approché avec un assemblage 6 barres, et un simple système bielle-manivelle permettra un fonctionnement avec un rendement dégradé. Pour un usage en réfrigération de nombreux mécanismes sont envisageables comme cames, vérins, solénoïdes …

<div class="mw-translate-fuzzy">
Il n’existe pas encore de prototype du moteur Dada. Une [[Thermodynamic_and_Mechanical_Study/fr|étude thermodynamique et mécanique complète]] a été réalisée, et a servi de base à la conception d’un [[Dada_Engine_Solver/fr|simulateur 0D]]. C’est un projet ouvert et libre, toute aide est bienvenue.
</div>

<span id="Motor_cycle"></span>
==Cycle moteur==

{{Webp|Motor cycle|640}}

===Phase I — échange basse pression, idéalement isobare===
La quasi-totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur froid, de la chaleur est extraite du gaz, son volume et sa température diminuent.

===Phase II — Compression, idéalement adiabatique===
Le grand cylindre se ferme complètement, le petit cylindre compresse le gaz, le volume diminue, pression et température augmentent.

===Phase III — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du petit cylindre vers le grand cylindre à travers l’échangeur chaud, il absorbe de la chaleur, son volume et sa température augmentent.

===Phase IV — Détente, idéalement adiabatique===
Le grand cylindre s’ouvre entièrement, le petit cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

<span id="Receiver_cycle_(heat_pump,_refrigerator)"></span>
==Cycle récepteur (pompe à chaleur, réfrigérateur)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, idéalement adiabatique===
Le petit cylindre se ferme complètement, le grand cylindre se ferme partiellement, le volume diminue, pression et température augmentent.

===Phase II — échange haute pression, idéalement isobare===
La totalité du gaz est transférée du grand cylindre vers le petit cylindre à travers l’échangeur chaud, le gaz y cède de la chaleur, son volume et sa température diminuent.

===Phase III — Détente, idéalement adiabatique===
Le petit cylindre s’ouvre entièrement, le grand cylindre participe à la détente et s’ouvre légèrement, le volume du gaz augmente, pression et température diminuent.

===Phase IV — échange basse pression, idéalement isobare===
la quasi-totalité du gaz est transféréé du petit cylindre au grand cylindre à travers l’échangeur froid, le gaz y absorbe de la chaleur, son volume et sa température augmentent.

<span id="Way_to_a_real_machine"></span>
==Vers une machine réelle==

Dans le moteur Dada les échangeurs thermiques restent actifs tout au long du cycle, compression et détente ne peuvent pas être parfaitement adiabatiques. Afin de limiter les irréversibilités ces phases doivent être brèves par rapport aux constantes de temps thermiques, les volumes morts et volumes internes des échangeurs seront ajustés au minimum.

Les transferts à travers les échangeurs engendrent des pertes de charge, l’isobare parfait est irréalisable. Afin de limiter ces pertes la durée des transferts est allongée de manière à limiter le débit, et les échangeurs doivent opposer le moins possible de résistance au passage du gaz.

Une étude thermodynamique complète du cycle a été réalisée à l’aide d’un usage massif de l’IA. J’ai appris beaucoup de choses au cours de cette écriture, et bien que ce travail me semble rigoureux il nécessite une relecture : [[Thermodynamic_and_Mechanical_Study/fr]].

À partir des équations établies dans cette étude, un simulateur 0D a été développé en Python (entièrement par IA, y compris la documentation) afin de rechercher les dimensions et paramètres optimaux de cette machine dans différentes configurations : [[Dada_Engine_Solver/fr]]. Je l’ai utilisé pour dimensionner une cellule de refroidissement utilisant de l'air comme gaz de travail et actionnée par pédalier. Je prévois de dimensionner un petit moteur de démonstration à air dans les prochaines semaines, puis une pompe à chaleur et un moteur utilisant l'hélium comme gaz de travail.

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Main Page/en

2026-10-10T17:25:15Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
==Presentation==

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [[https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

{{Webp|Crankcooler|1200}}

On a similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another. During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. So far, only microtube heat exchangers have been considered. The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be achieved using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, etc.

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[Dada_Engine_Solver|0D simulator]]. This is an open-source project, any help is welcome.

==Motor cycle==

{{Webp|Motor cycle|640}}

===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.

===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.

===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.

===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.

==Receiver cycle (heat pump, refrigerator)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

==Way to a real machine==

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a cooling cell using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

== Is it free? ==

Totally! The description of this invention is published here under [https://creativecommons.org/publicdomain/zero/1.0/deed.en Creative Commons Zero] license, however I cannot guarantee that all or part of this machine is not currently protected by a patent.

I sincerely hope that this idea will help reduce greenhouse gases emissions, and I'm convinced that making it free is the best thing I can do to facilitate its development and rapid spread.

== You can help! ==

By contributing with your ideas, knowledge, translations, corrections to the wiki; and also links to your work in case you don't want to contribute under the CC0 license.

Just register and edit.

You can also make a donation.

Translations:Main Page/80/en

2026-10-10T17:25:12Z

FuzzyBot: Importing a new version from external source

Translations:Main Page/76/en

2026-10-10T17:25:12Z

FuzzyBot: Importing a new version from external source

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a [[https://en.wikipedia.org/wiki/Brayton_cycle Brayton/Joule cycle]]. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

Main Page/en

2026-10-10T16:57:55Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
==Presentation==

The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a Brayton/Joule cycle. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.

{{Webp|Crankcooler|1200}}

On a similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another. During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.

Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. So far, only microtube heat exchangers have been considered. The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be achieved using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, etc.

There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[0D simulator]]. This is an open-source project, any help is welcome.

==Motor cycle==

{{Webp|Motor cycle|640}}

===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.

===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.

===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.

===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.

==Receiver cycle (heat pump, refrigerator)==

{{Webp|Receiver cycle|640}}

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

==Way to a real machine==

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a cooling cell using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

== Is it free? ==

Totally! The description of this invention is published here under [https://creativecommons.org/publicdomain/zero/1.0/deed.en Creative Commons Zero] license, however I cannot guarantee that all or part of this machine is not currently protected by a patent.

I sincerely hope that this idea will help reduce greenhouse gases emissions, and I'm convinced that making it free is the best thing I can do to facilitate its development and rapid spread.

== You can help! ==

By contributing with your ideas, knowledge, translations, corrections to the wiki; and also links to your work in case you don't want to contribute under the CC0 license.

Just register and edit.

You can also make a donation.

Main Page/fr

2026-10-10T16:57:53Z

FuzzyBot: Updating to match new version of source page

<languages/>
__NOTOC__
<div lang="en" dir="ltr" class="mw-content-ltr">
==Presentation==
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
The Dada engine is a dual-mode operation heat engine which moves a working gas in a closed circuit between two cylinders of different volumes, via two heat exchangers selected by passive valves, so as to approach a Brayton/Joule cycle. It can function either as an external heat engine or as a heat pump, refrigerator. The working gas may be inert: helium, nitrogen or air.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
{{Webp|Crankcooler|1200}}
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
On a similar principle, the [https://en.wikipedia.org/wiki/Stirling_engine Stirling engine], which has been in existence for two centuries, carries out heat transfer within the cylinders; the idea here is to transfer heat as the gas passes from one cylinder to another. During its cycle, the engine undergoes a compression and an expansion, interspersed with phases of heat exchange that are ideally isobaric. The valves determine the direction of flow through the heat exchangers. Between the end of compression and the start of expansion, all of the gas passes through the hot heat exchanger. During expansion and until the start of compression, all of the gas passes through the cold heat exchanger.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
Heat exchangers are a key component of this machine, they must provide maximum heat transfer surface area relative to internal volume, while minimising pressure drops. So far, only microtube heat exchangers have been considered. The cylinders and pistons are made from a material with low thermal conductivity. The piston kinematics can be achieved using various methods, achieving maximum efficiency requires a complex motion which can be accurately approximated using a 6-bar linkage, while a simple crank-connecting rod system will allow operation at reduced efficiency. For refrigeration applications, numerous mechanisms are possible, such as cams, actuators, solenoids, etc.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
There still exist no prototype of the Dada engine. A comprehensive [[Thermodynamic_and_Mechanical_Study|thermodynamic and mechanical study]] has been carried out, which served as the basis for the design of a [[0D simulator]]. This is an open-source project, any help is welcome.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
==Motor cycle==
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
{{Webp|Motor cycle|640}}
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase I — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the large cylinder to the small cylinder via the cold heat exchanger, heat is extracted from gas, causing its volume and temperature to decrease.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase II — Compression, ideally adiabatic===
The large cylinder closes completely, the small cylinder compresses the gas, causing its volume to decrease while its pressure and temperature increase.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase III — High-pressure heat exchange, ideally isobaric===
All of the gas is transferred from the small cylinder to the large cylinder via the hot heat exchanger, it absorbs heat, causing its volume and temperature to increase.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase IV — Expansion, ideally adiabatic===
The large cylinder opens fully, the small cylinder participates in the expansion and opens slightly, the volume of the gas increases, while the pressure and temperature decrease.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
==Receiver cycle (heat pump, refrigerator)==
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
{{Webp|Receiver cycle|640}}
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
==Way to a real machine==
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].
</div>

<div lang="en" dir="ltr" class="mw-content-ltr">
Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a cooling cell using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.
</div>

<span id="Is_it_free?"></span>
== C’est libre ? ==

Totalement ! La description de cette invention est publiée ici sous licence [https://creativecommons.org/publicdomain/zero/1.0/deed.fr Creative Commons Zero], cependant je ne peux vous garantir que tout ou partie de cette machine ne soit pas actuellement protégé par un brevet.

J’espère profondément que cette idée participe à la réduction des émissions de gaz à effet de serre, et je suis convaincu que la rendre libre est la meilleure chose à faire pour faciliter son développement et sa diffusion rapide.

<span id="You_can_help!"></span>
== Vous pouvez aider ! ==

En apportant au wiki vos idées, vos connaissances, des traductions, des corrections ; et aussi des liens vers vos réalisations au cas où vous ne souhaiteriez pas contribuer sous licence CC0.

Il suffit de s’inscrire, et éditer.

Vous pouvez aussi faire un don.

Translations:Main Page/97/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

Based on the equations established in this study, a 0D simulator was developed in Python (entirely by AI, including documentation) in order to determine the optimal dimensions and parameters of this machine in various configurations: [[Dada_Engine_Solver]]. I used it to size a cooling cell using air as working gas, powered by a pedal mechanism. I hope to size an air small demonstrator engine in the coming weeks, followed by a heat pump and a motor using helium as working gas.

Translations:Main Page/96/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

A comprehensive thermodynamic analysis of the cycle was carried out using extensive AI. I learnt a great deal while writing this, and although I believe this work to be rigorous, it requires an expert review: [[Thermodynamic_and_Mechanical_Study]].

Translations:Main Page/95/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

Heat transfer through the heat exchangers results in pressure drops, a perfect isobaric process is unachievable. To minimise these losses, the duration of the heat transfer is extended to limit the flow rate, and the heat exchangers must offer as little resistance as possible to the passage of the gas.

Translations:Main Page/94/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

In Dada engine, the heat exchangers remain active throughout the cycle, compression and expansion cannot be perfectly adiabatic. In order to minimise irreversibilities, these phases must be brief in relation to the thermal time constants, dead volumes and internal volumes of the heat exchangers will be kept to a minimum.

Translations:Main Page/93/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

==Way to a real machine==

Translations:Main Page/92/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

===Phase IV — low-pressure heat exchange, ideally isobaric===
Almost all of the gas is transferred from the small cylinder to the large cylinder via the cold heat exchanger, the gas absorbs heat there, and its volume and temperature increase.

Translations:Main Page/91/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

===Phase III — Expansion, ideally adiabatic===
The small cylinder opens fully, the large cylinder participates in the expansion and opens slightly, the volume of the gas increases, while pressure and temperature decrease.

Translations:Main Page/90/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

===Phase II — High-pressure heat exchange, ideally isobaric===
All the gas is transferred from the large cylinder to the small cylinder via the hot heat exchanger, the gas releases heat there, its volume and temperature decrease.

Translations:Main Page/89/en

2026-10-10T16:57:53Z

FuzzyBot: Importing a new version from external source

===Phase I — Compression, ideally adiabatic===
The small cylinder closes completely, the large cylinder closes partially, the volume decreases, while the pressure and temperature increase.