3. A vapor-compression refrigeration system for a house-hold refrigerator has refrigerating capacity of 1000 Btu/h. Refrigerant enters the evaporator after being throttled to a saturated mixture temperature of -10 F and exits at 0 F. The isentropic compressor efficiency is 80%. The refrigerant condenses (changes from vapor to liquid) at a condensing temperature of 95 F and exits the condenser subcooled at 90 F. There are no significant pressure drops in the flows through the evaporator and condenser. Determine the mass flow rate of refrigerant in lbm/s and the COP