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. 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?
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.
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?
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Please help me find out where you got the s values from for the exergies for each of the processes, particularly s4&s6, thank you.
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