By dividing the heat removed from the cold reservoir Qcold by the labor required to do so, the coefficient of performance, or COP, of a refrigerator is calculated (i.e., the work done by the compressor). The coefficient of performance is greatly influenced by both the desired inside temperature and the outside temperature (COP).
For a given desired cooling effect, the COP is inversely proportional to the work input delivered to the compressing unit. The evaporator or chilled chamber in a residential refrigerator has a lower temperature than the air conditioner.
The power (kW) that is delivered to the compressor and the power (kW) that is extracted from the heat pump as heat or cooling is known as the coefficient of performance, or COP. Consider this: A specific heat pump with air cooling has a COP of 2.
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