Consider a refrigerator and a heat pump working on the

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Consider a refrigerator and a heat pump working on the reversed Carnot cycle between the same temperature limits. Which of the following is correct?

1. COP of refrigerator = COP of heat pump
2. COP of refrigerator = COP of heat pump + 1
3. COP of refrigerator = COP of heat pump –1
4. COP of refrigerator = Inverse of the COP of heat pump

Correct Option: C

COP of refrigerator = COP of heat pump –1