An industrial freezer is maintained at -26 oC with a vapor compression refrigeration unit using R-134a (HFC-134a) as the working fluid. A throttle is used in the refrigeration cycle and the compressor is 80% efficient. Assuming that the exit of the condenser is at 32 oC and 100% saturated liquid, the exit of the evaporator is 100% saturated vapor,

a) Calculate the COP

b) Calculate the circulation rate of the refrigeration to deliver 126,500 kJ/h of cooling capacity.

c) If I had large amounts of free cooling water available at 25 oC , could it be used to improve the efficiency of the process? Explain why or why not.