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SECOND LAW OF THERMODYNAMICS
Wnet = Qnet (First law of thermodynamics)
Q2 = 0 , Wnet = Q1 , hth = 1
Such a heat engine is called as PMM2.
(Figure: Schematic diagram of Refrigeration plant and heat pump.)
Coefficient Of Performance(COP) =
(COP) ref =
(COP) H.P =
(COP) H.P = (COP) ref + 1
Carnot Theorem: It states that all heat engines operating between a given constant temperature source and given constant temperature sink, none has higher efficiency than a reversible engine.