9.) A cascade refrigeration system is composed of two ideal vapor compressions cycles with an inter-cooling heat exchanger. Data are given below. The refrigerating capacity is 40 tons. Determine (a) Totalpower input of the compressor (b) the coefficient of performance (e) the rate of exergy destruction in theintermediate heat exchanger.Solution:800 kPacondenserR-225 T= -15C2P2=400 kPaNH,evaporator1 T= -25CQA=40TR

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power input of the compressor (b) the coefficient of performance (c) the rate of exergy

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

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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Question

9.) A cascade refrigeration system is composed of two ideal vapor compressions cycles with an inter-
cooling heat exchanger. Data are given below. The refrigerating capacity is 40 tons. Determine (a) Total
power input of the compressor (b) the coefficient of performance (e) the rate of exergy destruction in the
intermediate heat exchanger.
Solution:
800 kPa
condenser
R-22
5 T= -15C
2
P2=400 kPa
NH,
evaporator
1 T= -25C
QA=40TR

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