A vapor-compression refrigeration system with a capacity of 10 tons has superheated Refrigerant 134a vapor entering the compressor at 158C, 4 bar, and exiting at 12 bar. The compression process can be modeled by py1.01 5 constant. At the condenser exit, the pressure is 11.6 bar, and the temperature is 448C. The condenser is water-cooled, with water entering at 208C and leaving at 308C with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. Determine
(a) the mass flow rate of the refrigerant, in kg/s.
(b) the power input and the heat transfer rate for the compressor, each in kW.
(c) the coefficient of performance.
(d) the mass flow rate of the cooling water, in kg/s.
(e) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the power input. Let T0 5 208C.