A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated ammonia vapor at -18°C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of -10°C from water at 27°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.
A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated ammonia vapor at -18°C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of -10°C from water at 27°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.
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 single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated
ammonia vapor at -18°C and discharges it at 1514.3 kPa. The system is used to produce
ice at a final temperature of -10°C from water at 27°C. The compressor runs at 450 rpm
with an actual volumetric efficiency of 78%. Assume compression and
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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