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The required refrigeration capacity of a vapor compression refrigeration system  (with R-22 as refrigerant) is 180,000 KJ/h at –30oC evaporator temperature.  Initially the system was single stage with a single compressor compressing the  refrigerant vapor from evaporator to a condenser operating at 1500 kPa pressure. Later the system was modified to a two-stage system operating on the  cycle shown below. At the intermediate pressure of 600 kPa there is intercooling  but no removal of flash gas. Find  a) Power requirement of the original single-stage system.  b) Total power requirement of the two compressors in the revised two-stage  system.

The required refrigeration capacity of a vapor compression refrigeration system  (with R-22 as refrigerant) is 180,000 KJ/h at –30oC evaporator temperature.  Initially the system was single stage with a single compressor compressing the  refrigerant vapor from evaporator to a condenser operating at 1500 kPa pressure. Later the system was modified to a two-stage system operating on the  cycle shown below. At the intermediate pressure of 600 kPa there is intercooling  but no removal of flash gas. Find  a) Power requirement of the original single-stage system.  b) Total power requirement of the two compressors in the revised two-stage  system.

Elements Of Electromagnetics
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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The required refrigeration capacity of a vapor compression refrigeration system 
(with R-22 as refrigerant) is 180,000 KJ/h at –30oC evaporator temperature. 
Initially the system was single stage with a single compressor compressing the 
refrigerant vapor from evaporator to a condenser operating at 1500 kPa
pressure. Later the system was modified to a two-stage system operating on the 
cycle shown below. At the intermediate pressure of 600 kPa there is intercooling 
but no removal of flash gas. Find 
a) Power requirement of the original single-stage system.
 b) Total power requirement of the two compressors in the revised two-stage 
system. 

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