A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and rejects 24 kJ into the room per cycle. What is the coefficient of performance?

Question

Quizplus · Accepted Answer

The coefficient of performance (COP) for a refrigerator is given by the formula COP = Qc/W, where Qc is the heat removed from the cold reservoir (freezing compartment) and W is the work input. Here, Qc = 20 kJ and the total heat rejected Qh = 24 kJ. The work done W = Qh - Qc = 24 kJ - 20 kJ = 4 kJ. Therefore, COP = 20 kJ / 4 kJ = 5.

A Refrigerator Removes Heat from the Freezing Compartment at the Rate