Define COP of Heat pump and refrigerator and derive the relationship between the two.
COP of Pump = Ratio of heat transferred to work done.
= Qh/W … i
COP of refrigerater = Ratio of heat removed to work done.
= Ql/W … ii
By first law, Qh = W + Ql
Put in i
(W + QL)/W = 1+ Cop ref (from ii)
COP pump = 1 + COP ref
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