A vapor-compression refrigeration system, using ammonia as the working fluid, has evaporator and condenser pressures of 40 and 200 Ibf/in2, respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop. At the inlet and exit of the compressor, the temperatures are 20°F and 300°F, respectively. The heat transfer rate from the working fluid passing through the condenser is 60,000 Btu/h, and liquid exits at 200 lf/in?, 90°F. The compressor operates adiabatically.

(a) Determine the refrigerating capacity, in tons.

(b) Compressor power

(c) COP

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