(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28 C and has heat transfer to another environment at 49 ° C? COP, = 3.18 ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = 1316.4 kJ (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)? Cost in cents = 3.66 (d) How many kJ of heat transfer, Q, occurs into the warm environment? Qn = 1314.5
(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28 C and has heat transfer to another environment at 49 ° C? COP, = 3.18 ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = 1316.4 kJ (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)? Cost in cents = 3.66 (d) How many kJ of heat transfer, Q, occurs into the warm environment? Qn = 1314.5
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 21P
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Question
![(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28
C and has heat transfer to another environment at 49 ° C?
COP,
= 3.18
ref
(b) How much work must be done for a heat transfer of 4186 kJ from the cold environment?
W = 1316.4
kJ
(c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)?
Cost in cents = 3.66
(d) How many kJ of heat transfer, Q, occurs into the warm environment?
Qn
= 1314.5](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F43af04e8-6dc7-4823-b768-db5c1dd480a9%2Fe2ae3909-9d8b-4200-9a6d-311bd77e3142%2Fzf9vlgn.png&w=3840&q=75)
Transcribed Image Text:(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28
C and has heat transfer to another environment at 49 ° C?
COP,
= 3.18
ref
(b) How much work must be done for a heat transfer of 4186 kJ from the cold environment?
W = 1316.4
kJ
(c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)?
Cost in cents = 3.66
(d) How many kJ of heat transfer, Q, occurs into the warm environment?
Qn
= 1314.5
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