Physics, 30.08.2019 19:20, kobiemajak

Fred has the idea to improve the efficiency of a certain heat engine exploiting a high-temperature reservoir, by using part of its output to run a refrigerator which cools a low-temperature (finite-sized) heat sink to a temperature below the environmental temperature. fiona tells fred that his efforts are futile. who is correct? in particular, what can you say about the overall efficiency of fred's scheme, assuming everything operates reversibly?

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Fred has the idea to improve the efficiency of a certain heat engine exploiting a high-temperature r...