A coal-fired power-plant receives heat at a rate of 625 MW from the combustion of coal, and rejects 430 MW of heat to cooling water received from a lake. Determine the thermal efficiency of the power plant.
Given: Q?C=?430 MW; Q?H=625 MW
Assume: The power plant is operating as a cyclic heat engine.
What will be an ideal response?
For a cycle: Wcycle = Qcycle
There are two heat transfers and one power, so Q?cycle=Q?H+Q?C=W?
Therefore, W?=195 MW
Then, the thermal efficiency is n = W/QH = 0.312
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