Heat question?

Calculate the maximum possible efficiency of a heat engine that uses surface lake water at 18.0°C as a source of heat and rejects waste heat to the water 0.100 km below the surface where the temperature is 4.1°C.

Answer:
The maximum possible efficiency will be given by the Carnot cycle, where efficiency = 1 - (Tc/Th). So for your system:

n = 1 - (4.1/18) = 0.772 = 77.2%

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