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A two – stage compressor with a clearance of 6% receives 80 lb/min of air at 14  psia and 850 F and delivers it at 120 psia. The compressions are polytropic with n=1.30,

A two – stage compressor with a clearance of 6% receives 80 lb/min of air at 14  psia and 850 F and delivers it at 120 psia. The compressions are polytropic with n=1.30,

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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A two – stage compressor with a clearance of 6% receives 80 lb/min of air at 14  psia and 850 F and delivers it at 120 psia. The compressions are polytropic with n=1.30, and the intercooler cools the air back to 850F. Find (a) the work, (b) the heat transferred in the various processes, (c) the work for a single – stage machine, (d) the corresponding percentage saving for the two – stage machine, and (f) the mass of water to be circulated through the intercooler if its temperature rise is 15% F
Ans. (a) -171.6 hp; (b) -802.8 Btu/min; (c) -2938 Btu/min; (d) -196 hp; (e) 
12.45%; (f) 196 lb/mi

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