Answered: produce ice at a final temperature of -…

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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5. A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated ammonia vapor at - 18 degrees * C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of - 10 degrees * C from water at 27 degrees * C . The compressor runs at 450 rpm with an actual volumetric efficiency of 78%. Assume compression and mechanical efficiencies to be 82% and 88%, respectively. Calculate the following: (a) capacity of the system in tons of refrigeration, (b) brake hp required by the compressor, (c) tons of ice produced per day if compressor runs only 20 hours a day. Assume losses to be 10% of the refrigeration required to produce the ice, and (d) ideal and actual COP.

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