Performance of heat pumps is valued usually by
Coefficient of Performance (COP for short). COP stands for the amount of heat transferred
to the high-temperature objects from the low-temperature ones divided by the
motive power amount needed. Generally COP stays between 3 and 4, which means
heat pumps can transfer heat three or four times higher than what it consumes to
the high-temperature objects. So heat pumps are in fact a heat elevator. They
consume very little electricity when working but they can absorb heat four to
seven times higher than electricity from the environmental medium such as
water, air and soil. It is one of their environmentally-friendly point for they
elevate the temperature and use it.
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