1. A vapor-compression refrigeration system usestetrafluoroethane (HFC134a) as refrigerant. For the following sets of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Evaporation t=30F; condensation t=80F; (compressor) =0.79; refrigeration rate =600(Btu)(s)1. Assume both the throttling and compression are adiabatic. Repeat the calculation assuming the rate of heat loss from the compressor surface is 50 Btu/s with an environmental temperature of 70F and all other conditions are the same