Reconsider Prob. 11–120E. The refrigeration system of that problem cools one reservoir at −15°F and one at 40°F while rejecting heat to a reservoir at 80°F. Which process has the highest exergy destruction?

Data From Reconsider Prob. 11–120E:

A two-evaporator compression refrigeration system  as shown in Fig. P11–120E uses refrigerant-134a as the  working fluid. The system operates evaporator 1 at 30°F, evaporator  2 at −29.5°F, 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.

Transcribed Image Text:

m, + m2 (3) Condenser Evaporator 1 Pressure reducing valve Evaporator 2