The coefficient of performance (COP) of a refrigerator working as a heat pump is given by

1
(COP)heat pump = (COP)refrigerator
2
(COP)heat pump = (COP)refrigerator – 1
3
(COP)heat pump = (COP)refrigerator + 1
4
(COP)heat pump = (COP)refrigerator + 2

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