Question: A Carnot heat engine receives energy from a reservoir at Tres through a heat exchanger where the heat transferred is proportional to the temperature difference

A Carnot heat engine receives energy from a reservoir at Tres through a heat exchanger where the heat transferred is proportional to the temperature difference as QH = K (Tres - TH). It rejects heat at a given low temperature TL. To design the heat engine for maximum work output show that the high temperature, TH in the cycle should be selected as TH = √Tres TL

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