Refrigerant 134a is the working fluid in a vapor-compressionheat pump system with a heating capacity of 60,000 Btu/h. Thecondenser operates at 180 lbf/in.2, and the evaporatortemperature is 0°F. The refrigerant is a saturated vapor at theevaporator exit and a liquid at 110°F at the condenser exit.Pressure drops in the flows through the evaporator and condenserare negligible. The compression process is adiabatic, and thetemperature at the compressor exit is 180°F. Determine
| (a) the mass flow rate of refrigerant, inlb/min |
| (b) the compressor power input, inhorsepower |
| (c) the isentropic compressor efficiency |
| (d) the coefficient of performance |
Round answers to 3 significant digits.
