Answered: The figure shows a two-stage,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The figure shows a two-stage, vapor-compression refrigeration system with two evaporators and a direct contact heat exchanger. Saturated vapor ammonia from evaporator 1 enters compressor 1 at 12 lbf/in² and exits the compressor at 62 lbf/in². Evaporator 2 operates at 62 lbf/in², with saturated vapor exiting at state 8. The condenser pressure is 200 lbf/in², and saturated liquid refrigerant exits the condenser. Each compressor stage has an isentropic efficiency of 80%. The refrigeration capacity of each evaporator is shown on the figure.

Determine the temperature, in °F, of the refrigerant in evaporator 2.

Qout
Condenser
-4
Compressor
2
Expansion
valve
-3
Direct
8
Evaporator
2
contact
heat
exchanger
Qin.2 = 10 tons
-2
W
VExpansion
valve
c,1
Compressor
1
7
1
Evaporator
1
Čin.1 = 5 tons

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