Refrigerant 22 in a refrigeration system enters one side of a counter-flow heat exchanger at 12 bar, 28°C. The refrigerant exits at 12 bar, 20°C. A separate stream of R-22 enters the other side of the heat exchanger as saturated vapor at 2 bar and exits as superheated vapor at 2 bar. The mass flow rates of the two streams are equal. Stray heat transfer from the heat exchanger to its surroundings and kinetic and potential energy effects are negligible. Determine the entropy production in the heat exchanger, in kJ/K per kg of refrigerant flowing. What gives rise to the entropy production in this application? Show state point 1 and 2, then 3 and 4 on a T-s diagram, show the process from 1 to 2 and from 3 to 4.

Refrigerant 22 in a refrigeration system enters one side of a counter-flow heat exchanger at 12 bar, 28°C. The refrigerant exits at 12 bar, 20°C. A separate stream of R-22 enters the other side of the heat exchanger as saturated vapor at 2 bar and exits as superheated vapor at 2 bar. The mass flow rates of the two streams are equal. Stray heat transfer from the heat exchanger to its surroundings and kinetic and potential energy effects are negligible. Determine the entropy production in the heat exchanger, in kJ/K per kg of refrigerant flowing. What gives rise to the entropy production in this application? Show state point 1 and 2, then 3 and 4 on a T-s diagram, show the process from 1 to 2 and from 3 to 4.

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

Refrigerant 22 in a refrigeration system enters one side of a counter-flow heat exchanger at 12
bar, 28°C. The refrigerant exits at 12 bar, 20°C. A separate stream of R-22 enters the other side
of the heat exchanger as saturated vapor at 2 bar and exits as superheated vapor at 2 bar. The
mass flow rates of the two streams are equal. Stray heat transfer from the heat exchanger to its
surroundings and kinetic and potential energy effects are negligible. Determine the entropy
production in the heat exchanger, in kJ/K per kg of refrigerant flowing. What gives rise to the
entropy production in this application?
Show state point 1 and 2, then 3 and 4 on a T-s diagram, show the process from 1 to 2 and from 3 to 4.
,(2) 12 bar
20°C
12 bar
(1)
28°C
(4)
2 bar
(3)
2 bar
sup. vapor
sat. vapor

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