A refrigeration unit is cooling a space to -5°C by rejecting energy to the atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to a value of -25°C. Calculate (a) the coefficient of performance for the initial condition assuming a Carnot refrigerator, and (b) the minimum fractional increase in work required for the same amount of energy removed, (that is, find the ratio of the new work to the initial work).
A refrigeration unit is cooling a space to -5°C by rejecting energy to the atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to a value of -25°C. Calculate (a) the coefficient of performance for the initial condition assuming a Carnot refrigerator, and (b) the minimum fractional increase in work required for the same amount of energy removed, (that is, find the ratio of the new work to the initial work).
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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Question
A refrigeration unit is cooling a space to -5°C by rejecting energy to the
atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to a
value of -25°C. Calculate (a) the coefficient of performance for the initial condition
assuming a Carnot refrigerator, and (b) the minimum fractional increase in work required
for the same amount of energy removed, (that is, find the ratio of the new work to the
initial work).
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