solution

To determine the effect of changing condenser pressure on the performance of an ideal vapor-compression refrigeration cycle, plot the coefficient of performance and the refrigerating capacity, in tons, for the cycle in Problem 8.44 for condenser pressures ranging from 8 to 16 bar. All other conditions are the same as in Problem 8.44.

A vapor-compression refrigeration system, using ammonia as the working fluid, has evaporator and condenser pressures of 2 and 12 bar, respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop. At the inlet and exit of the compressor, the temperatures are 10C and 140C, respectively. The heat transfer rate from the working fluid passing through the condenser is 15 kW, and liquid exits at 12 bar, 28C. If the compressor operates adiabatically, determine

(a) the compressor power input, in kW.

(b) the coefficient of performance.