Translations:Thermodynamic and Mechanical Study/457/en

${\dot{H}}_{𝒞}^{\mathrm{e}\mathrm{x}\mathrm{t}}=\sum _{\mathrm{i}\mathrm{n}}\dot{m}{C}_p{T}_u-\sum _{\mathrm{o}\mathrm{u}\mathrm{t}}\dot{m}{C}_p{T}_u.$