A certain walk-in freezer requires an average of 3000 W of thermal power to be removed from it to maintain a temperature of 4C on a hot day in July,…

A certain walk-in freezer requires an average of 3000 W of thermal power to be removed from it to maintain a temperature of −4◦C on a hot day in July, when the ambient temperature is 35◦C. (a) What is the coefficient of performance of cooling, for the freezer, assuming an ideal (reversible) heat pump? (b) What would be the new COP if the freezer were installed in the basement, where the air temperature is 19◦C? (c) How much electrical power does the freezer use (for 3000 W of cooling) when installed in each of the two locations?

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