A vapor-compression refrigeration system for a household refrigerator has a refrigerating capacity of 1500 Btu/h and uses R-134a as the refrigerant. The refrigerant enters the evaporator at30 lbf/in2 and exits at 20F. The isentropic compressor efficiency is 70%. The refrigerant condenses at 123 lbf/in2 and exits the condenser as subcooled at 91.97oF. There are no significant pressure drops in the flows through the evaporator and condenser. Determine
(a) The mass flow rate of refrigerant in lb/min,
(b) The compressor power input in horsepower and
(c) The coefficient of performance.