- 2nd law of thermodynamics and Carnot heat engine
Main Question or Discussion Point
In heat engine we define a heat source from where heat is transferred to the system, we say that heat source has a temperature ##T_h## , When we define a Carnot heat engine, the first process we have is an isothermal expansion and we say heat has to come in system through this process and here the ##T_h## is the constant temperature of that isothermal process .Are they both same? I'm getting confused in getting what actually is the source and sink in both cases and what are their temperature? Also in the entropy equation $$\oint dQ_r/T=0$$ what is the temperature T?