What happens
of the COP of a heat pump, when the temperature difference between source and
sink is decreased?
जब स्रोत और सिंक के बीच तापमान का अंतर कम हो जाता है, तो ताप पंप के सीओपी का क्या होता है?
Decreases
First decreases, then increases
First increases, then decreases
Increases
Increases
The
efficiency of the cycle is given
Here, T1= Source temperature
TS= Sink temperature
If the
difference between temperature of the source and the sink is increased (i.e.
temperature of source increase or temperatures of sink decreases)
The 
value decreases and
thus efficiency increases.
Whereas, COP 
If (T1- T2)decreases,(COP)HP increases with
decrease in difference source and sink.
Hence, the
correct option is (D).
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