Reconsider Prob. 11-107. Using EES (or other) software, investigate the effect of evaporator pressure on the COP and the power input. Let the evaporator pressure vary from 120 to 380 kPa. Plot the COP and the power input as functions of evaporator pressure, and discuss the results.
Prob. 11-107
A large refrigeration plant is to be maintained at - 15oC, and it requires refrigeration at a rate of 100 kW. The condenser of the plant is to be cooled by liquid water, which experiences a temperature rise of 88C as it flows over the coils of the condenser. Assuming the plant operates on the ideal vapor-compression cycle using refrigerant- 134a between the pressure limits of 120 and 700 kPa, determine
(a) The mass flow rate of the refrigerant.
(b) The power input to the compressor.
(c) The mass flow rate of the cooling water.