A refrigerator uses refrigerant R-134a as working fluid and operates on the idea

Question

A refrigerator uses refrigerant R-134a as working fluid and operates on the ideal vapor-compression
refrigeration cycle, except for the compression process. The refrigerant enter the evaporator at 120 kPa with
a quality of 30%, and leaves the compressor at 60 ?C. The compressor has an isentropic efficiency of 90%.
Plot the cycle in a T -s diagram, identify all the properties following the same directives than in HW5-Prob.
2, and determine the COP of the refrigerator.
and Determine the COP of the same device if it is used as a Heat Pump
instead of as refrigerator.

Explanation / Answer

efficiency is given in the problem. so its easy to find input power= 450w
as for a refrigerator

Qh-QL/Win = efficiency

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