Main Page/en - Revision history

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	{{Webp\|Crankcooler\|1200}}		{{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~~.		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.

	~~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~~.		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.

	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.		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==		==Motor cycle==

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	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]].		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.		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? ==		== Is it free? ==

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	==Presentation==		==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.		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}}		{{Webp\|Crankcooler\|1200}}

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	==Presentation==		==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.		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}}		{{Webp\|Crankcooler\|1200}}
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	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.		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.		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==		==Motor cycle==

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	== Thermodynamics ==		== Thermodynamics ==


	(Updated September 2026)		(Updated September 2026)
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	An analytical study of the receptor cycle is available here:		An analytical study of the receptor cycle is available here:
	[[Special:MyLanguage/Thermodynamic_and_Mechanical_Study]]		[[Special:MyLanguage/Thermodynamic_and_Mechanical_Study\|Thermodynamic and Mechanical Study]]

	{{~~warning~~\|1=I made extensive use of AI to complete this work; I have carefully proofread and edited it, and I consulted three major LLMs to obtain different perspectives. At this stage, validation by a qualified human is required.}}		{{Caution\|1=I made extensive use of AI to complete this work; I have carefully proofread and edited it, and I consulted three major LLMs to obtain different perspectives. At this stage, validation by a qualified human is required.}}


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	The development of a software solver and the first numerical applications will follow shortly.		The development of a software solver and the first numerical applications will follow shortly.




	== Mechanics ==		== Mechanics ==

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	In the theoretical machine that [https://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carnot Sadi Carnot] used to describe his ideal cycle, the hot and cold sources must act alternately in the same place, which seems technically unfeasible. The use of two cylinders and two heat exchangers makes it possible to imitate this machine, but induces friction and dead volume.<br clear=all>		In the theoretical machine that [https://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carnot Sadi Carnot] used to describe his ideal cycle, the hot and cold sources must act alternately in the same place, which seems technically unfeasible. The use of two cylinders and two heat exchangers makes it possible to imitate this machine, but induces friction and dead volume.<br clear=all>


	== Ideal cycle ==		== Ideal cycle ==
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	== Thermodynamics ==		== Thermodynamics ==

	~~=== Operating temperatures ===~~

	~~The extreme temperatures reached by the gas depend on~~ the ~~nature~~ of ~~the gas~~, ~~its initial pressure~~, ~~and the stroke of the pistons during adiabatic phases~~. ~~A machine capable~~ of ~~modifying~~ the ~~latter parameter would allow working with variable temperatures~~.		(Updated September 2026)

			=== First Study ===

			An analytical study of the receptor cycle is available here:
			[[Special:MyLanguage/Thermodynamic_and_Mechanical_Study]]

			{{warning\|1=I made extensive use of AI to complete this work; I have carefully proofread and edited it, and I consulted three major LLMs to obtain different perspectives. At this stage, validation by a qualified human is required.}}


			=== Numerical Application ===

			The development of a software solver and the first numerical applications will follow shortly.


	~~=== Heat transfer ===~~

	~~The realization of isothermal phases in the ideal cycle requires the matching of :~~
	* the nature of the gas and its initial pressure,
	* the characteristics of the heat exchangers, the difference between the temperatures of the hot and cold sources and the extreme temperatures of the gas,
	* the volume ratio of the two cylinders.

	== Mechanics ==		== Mechanics ==

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	\|}		\|}

	=== ~~Receiving~~ cycle ===		=== Receiver cycle ===

	{\| class="wikitable"		{\| class="wikitable"
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	\|-		\|-
	\|'''2 Isothermal expansion:''' The gas expands from the small cylinder to the large cylinder, capturing heat in the first heat exchanger.		\|'''2 Isothermal expansion:''' The gas expands from the small cylinder to the large cylinder, capturing heat in the first heat exchanger.
	\|[[File:Recept_detente_isotherme.png\|frameless\|the small cylinder empties completely, while the large cylinder ~~remains empty.~~]]		\|[[File:Recept_detente_isotherme.png\|frameless\|the small cylinder empties completely, while the large cylinder fills completely]]
	\|-		\|-
	\|'''3 Adiabatic compression:''' The gas is compressed in the large cylinder, increasing its temperature.		\|'''3 Adiabatic compression:''' The gas is compressed in the large cylinder, increasing its temperature.
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	== Mechanics ==		== Mechanics ==

	The technical possibilities for animating the pistons are numerous, particularly for the receiver cycle, solenoids, camshafts, cylinders … but a simple [[4-bar mechanism]] seems promising for the realization of an efficient low tech heat pump:[[File:Animation recepteur 4 barres.gif\|center\|Heat pump animated by two symmetrical 4-bar mechanisms]]		The technical possibilities for animating the pistons are numerous, particularly for the receiver cycle, solenoids, camshafts, cylinders … but a simple [[Special:MyLanguage/4-bar mechanism\|4-bar mechanism]] seems promising for the realization of an efficient low tech heat pump:[[File:Animation recepteur 4 barres.gif\|center\|Heat pump animated by two symmetrical 4-bar mechanisms]]

	== Is it free? ==		== Is it free? ==
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	== You can help! ==		== 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~~.		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.

	You can also ~~[https://www.papayoux-solidarite.com/en/collecte/machine-thermique-libre~~ make a donation].		Just register and edit.

			You can also make a donation.

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	<languages/>		<languages/>
	== Goal ==		== Goal ==

	[[File:Animation cycle recepteur ideal.gif\|frame\|right\|receiver cycle<br />(heat pump)]]		[[File:Animation cycle recepteur ideal.gif\|frame\|right\|receiver cycle<br />(heat pump)]]
	To develop a reversible [https://en.wikipedia.org/wiki/Heat_engine heat engine], which circulates a gas in a closed circuit between two insulating cylinders of different volumes, through two heat exchangers, in order to approach the [https://en.wikipedia.org/wiki/Carnot_cycle Carnot cycle].		To develop a reversible [https://en.wikipedia.org/wiki/Heat_engine heat engine], which circulates a gas in a closed circuit between two insulating cylinders of different volumes, through two heat exchangers, in order to approach the [https://en.wikipedia.org/wiki/Carnot_cycle Carnot cycle].
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	== Mechanics ==		== Mechanics ==

	The technical possibilities for animating the pistons are numerous, particularly for the receiver cycle, solenoids, camshafts, cylinders ~~...~~ but a simple [[4-bar mechanism]] seems promising for the realization of an efficient ''low tech'' heat pump:[[File:Animation recepteur 4 barres.gif\|center\|Heat pump animated by two symmetrical 4-bar mechanisms]]		The technical possibilities for animating the pistons are numerous, particularly for the receiver cycle, solenoids, camshafts, cylinders … but a simple [[4-bar mechanism]] seems promising for the realization of an efficient low tech heat pump:[[File:Animation recepteur 4 barres.gif\|center\|Heat pump animated by two symmetrical 4-bar mechanisms]]

	== Is it free? ==		== Is it free? ==

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