(5) Asingle-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. Ans. (a) 17.04 TR, (b) 32 hp, (c) 8.37 tons, (d) 3.4, 2.79

(5) Asingle-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. Ans. (a) 17.04 TR, (b) 32 hp, (c) 8.37 tons, (d) 3.4, 2.79

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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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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(5) Asingle-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.
Ans. (a) 17.04 TR, (b) 32 hp, (c) 8.37 tons, (d) 3.4, 2.79

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