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COP(Heat Pump)=COP(Refrigerator)+1

Heat PUmp:

Heat pump is a device that transfers heat from a colder area to a hotter area by using mechanical energy, as in a refrigerator. In heat pump how much heat is rejected at higher temperature is an important quantity.

Coefficient of performance of Heat Pump $\displaystyle {{(COP)}_{H}}=\frac{{{Q}_{1}}}{W}$

$\displaystyle {{Q}_{1}}=W+{{Q}_{2}}$ ⇒ $\displaystyle W={{Q}_{1}}-{{Q}_{2}}$

∴ $\displaystyle {{(COP)}_{H}}=\frac{{{Q}_{1}}}{{{Q}_{1}}-{{Q}_{2}}}$ ……….(1)

Refrigerator:

A refrigerator is a device which is designed to remove heat from a space that is at lower temperature than its surroundings. In refrigerator heat extracted from lower temperature is an important quantity.