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Definition: A
thermodynamic heat pump or refrigerator transfers heat from one
system to another system at higher temperature obtaining the necessary
work from a third system.
If the purpose is to
heat a system, the mechanism is called a heat pump. If the purpose is
to cool a system, the mechanism is called a refrigerator. A
thermodynamic heat pump or refrigerator is a thermodynamic engine run in
reverse, thus solving equation (9.5) for the coefficient of
refrigerator performance
 and
the coefficient of heat pump performance
 yields
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(C) 2005-2014 Wayne M. Angel.
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