Question: A vapor-compression refrigeration system (as shown below) is conventional except that a countercurrent heat exchanger is installed to subcool the liquid from the condenser by

A vapor-compression refrigeration system (as shown below) is conventional except that a countercurrent heat exchanger is installed to subcool the liquid from the condenser by heat exchange with the vapor stream from the evaporator. The minimum temperature difference for heat transfer is 5C. Tetrafluoroethane is the refrigerant evaporating at -6C and condensing at 26C. The heat load on the evaporator is 2000 kJ-s1. If the compressor efficiency is 75%, what is the power requirement? How does this result compare with the power required by the compressor if the system operates without the heat exchanger? How do the refrigerant circulation rates compare for the two cases? Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). T S Vapor-compression refrigeration cycle The power requirement is 2 kW. Throttle valve Condenser Evaporator Compressor 2 The refrigerant circulation rate is kg-s1 If the system operates without the

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