A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?

Answer 1

680C = 273+680 = 953 K
220 C = 273 + 220 = 493 K

e = (953-493)/953 = .483

IF and ONLY IF it is a Carnot cycle heat engine (maximum efficiency)

Answer 2

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Answer 3

545