Question

To make ice, a freezer that is a reverse Carnot engine extracts 42 k) as heat at -13°C during each cycle, with coefficient of performance 6.0. The room temperature is 29.9°C. How much (a) energy per cycle is delivered as heat to the room and (b) work per cycle is required to run the freezer? (a) Number Units (b) Number Units Click if you would like to Show Work for this question: Open Show Work

Answer 1

Reverse Carnot Engine Heat extractedhat -13°C = 42 kJ Loefficient of the Room tom s performances B= 6 Room temperature = 99.9°C Heat delivered by engine to room = 49k t - Work done to run freezer - 42 = 7 kJ as f = theat extracted - Work done * Work done = 48 = 7 kJ Heat rejected = t48 = 49 kJ

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