Reconsider Prob. 11-114E. The refrigeration system of that problem cools one reservoir at - 15oF and one at 40oF while rejecting heat to a reservoir at 80oF. Which process has the highest exergy destruction?
Prob. 11-114E
A two-evaporator compression refrigeration system as shown in Fig. P11-114E uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 30oF, evaporator 2 at 229.5oF, and the condenser at 160 psia. The cooling load of evaporator 1 is double that of evaporator 2. Determine the cooling load of both evaporators per unit of flow through the compressor, as well as the COP of this system. The refrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic.