Exercise 5.50The refrigerator shown in Fig operates atRefrigeratorB = 4.5steady state with a coefficient of performance of 4.5and a power input of 0.8 kW. Energy is rejected fromthe refrigerator to the surroundings at 20°C by heattransfer from metal coils whose average surfacetemperature is 28°C.Surroundings, 20°C- Coils, 28°CDetermine(a) the rate energy that is rejected, in kW.(b) the lowest theoretical temperature inside therefrigerator, in K.(c) the maximum theoretical power, in kW, that couldbe developed by a power cycle operating between thecoils and the surroundings. Would you recommendmaking use of this opportunity for developing power?0.8 kW49Chapler

here for a). apply Cop formula so we will get Q evaporator then by energy balance Qrejected=…

steady state with a coefficient of performance of 4.5 and a power input of 0.8 kW. Energy is rejected from the refrigerator to the surroundings at 20°C by heat transfer from metal coils whose average surface temperature is 28°C.

steady state with a coefficient of performance of 4.5 and a power input of 0.8 kW. Energy is rejected from the refrigerator to the surroundings at 20°C by heat transfer from metal coils whose average surface temperature is 28°C.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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Question

Exercise 5.50
The refrigerator shown in Fig operates at
Refrigerator
B = 4.5
steady state with a coefficient of performance of 4.5
and a power input of 0.8 kW. Energy is rejected from
the refrigerator to the surroundings at 20°C by heat
transfer from metal coils whose average surface
temperature is 28°C.
Surroundings, 20°C
- Coils, 28°C
Determine
(a) the rate energy that is rejected, in kW.
(b) the lowest theoretical temperature inside the
refrigerator, in K.
(c) the maximum theoretical power, in kW, that could
be developed by a power cycle operating between the
coils and the surroundings. Would you recommend
making use of this opportunity for developing power?
0.8 kW
49
Chapler

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