A cyclic heat engine produces 10 kW of power while receiving 25 kW of heat as an input. Determine the heat rejection rate to the cool space, and the thermal efficiency of the heat engine.
Given: W?=10 kW; Q?H=25 kW
Assume: The heat engine is operating as a cycle.
What will be an ideal response?
Solution: For a cycle: Wcycle = Qcycle
There are two heat transfers and one power, so Q?cycle=Q?H+Q?C=W?
So, ????? ????= -15 kW
For a Heat Engine: n=W?/Q?H = 0.40
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