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HEAT ENGINES

Working Substance

Heating Substance can be any system preferably having high heat capacity

The system is made to undergo a process that results in conversion of heat to work

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Heat Source and Heat Sink

The working substance goes through  several processes

Hot Reservoir is having infinite thermal capacity  kept at a high temperature T1. The working substance heat Q1 from the Hot Reservoir

Cold Reservoir is having infinite thermal capacity  kept at a low temperature T2. The working substance heat Q2 to the Cold Reservoir after performing work W

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Efficiency of Heat Engine

eff

For Q2 = 0, η = 1, i.e., the engine will have % efficiency in converting heat into work. First law of thermodynamics never rules out such situation

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