Coefficient of performance

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The coefficient of performance (or COP) is the ratio of the energy output to work input. 

 or  C.O.P.= heat transferred
             -----------------
             electricity input

For example in a heat pump the COP will be the heat transferred by the pump over the electricity input. It can also be expressed in terms of power as the rate of energy transfer into or out of the house.

The COP of a heat pump decreases as the outside temperature drops. As the temperature decreases there is less heat pumped and therefore the COP is lowered.

COP=benefit this means that COP=Qc/W, where W is the work and Qc is the heat sucked out of the cold reservoir (for a refrigerator) 

         ------                                         COP=Qh/W     Where Qh is the heat pushed into the hot reservoir (for a heat engine)
         cost



--Fatima 12:50, 5 October 2007 (PDT)

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