Ammonia is the working fluid in a vapor-compression heat pump system with a heating capacity of 24,000 Btu/h. The condenser operates at 250 lbf/in.2 , and the evaporator temperature is 10F. The refrigerant is a saturated vapor at the evaporator exit and a liquid at 105F at the condenser exit. Pressure drops in the flows through the evaporator and condenser are negligible. The compression process is adiabatic, and the temperature at the compressor exit is 360F. Determine

(a) the mass flow rate of refrigerant, in lb/min.

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(b) the compressor power input, in horsepower.

(c) the isentropic compressor efficiency.

(d) the coefficient of performance.


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