Question: A heat engine's high temperature TH could be ambient temperature, because liquid nitrogen at 77 K TL could be and is cheap. What would be

A heat engine's high temperature TH could be ambient temperature, because liquid nitrogen at 77 K TL could be and is cheap. What would be the efficiency of a Carnot engine that made use of heat transferred from air at room temperature (293 K) to the liquid nitrogen "fuel" (Fig.15-25)?

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