Co-efficient of Performance (c.o.p)

It is defined as the ratio of heat extracted in the refrigerator to the work done one the refrigerant
Theo. C.O.P =Q/W

Q= Amount of heat extracted in the refrigerator
W=Amount of work done

Relative C.O.P =actual c.o.p/theo. c.o.p

Problem 1.
1.Find the C.O.P of a refrigerator system if work input is 80KJ/Kg and the refrigeration effect produced is 160KJ/Kg of refrigerant flowing ?

Ans.
C.O.P =Q/W ( Q=160KJ/Kg)
=160/80 (W=80KJ/Kg)
=2KJ/Kg