3. The system in Problem 2 assumes the AT for heat transfer between the refrigeration system condenser and the environment is zero, and the AT between the refrigeration system evaporator and the cold space is zero. This gives us the best possible performance, but it is unrealistic as you need some reasonable AT to drive the heat transfer. Assume you have a Carnot refrigerator that provides the same 10.55 kW of cooling, but the condenser operates at 35°C and the evaporator is at -15°C. These then, respectively, push heat to the environment at 20°C and pull heat out of the 0°C cold space, as shown in the figure. Assuming the cycle itself (i.e., inside the dashed line) still operates as a Carnot refrigerator, find the electric power needed to generate the 3-tons of cooling capacity, the daily cost for this electricity, and COPR. Environment=20°C QH QH Q₁ Q₁ Cold Space=0°C 35°C W -15°C

3. The system in Problem 2 assumes the AT for heat transfer between the refrigeration system condenser and the environment is zero, and the AT between the refrigeration system evaporator and the cold space is zero. This gives us the best possible performance, but it is unrealistic as you need some reasonable AT to drive the heat transfer. Assume you have a Carnot refrigerator that provides the same 10.55 kW of cooling, but the condenser operates at 35°C and the evaporator is at -15°C. These then, respectively, push heat to the environment at 20°C and pull heat out of the 0°C cold space, as shown in the figure. Assuming the cycle itself (i.e., inside the dashed line) still operates as a Carnot refrigerator, find the electric power needed to generate the 3-tons of cooling capacity, the daily cost for this electricity, and COPR. Environment=20°C QH QH Q₁ Q₁ Cold Space=0°C 35°C W -15°C

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

3. The system in Problem 2 assumes the AT for heat transfer between
the refrigeration system condenser and the environment is zero,
and the AT between the refrigeration system evaporator and the
cold space is zero. This gives us the best possible performance, but
it is unrealistic as you need some reasonable AT to drive the heat
transfer. Assume you have a Carnot refrigerator that provides the
same 10.55 kW of cooling, but the condenser operates at 35°C and
the evaporator is at -15°C. These then, respectively, push heat to
the environment at 20°C and pull heat out of the 0°C cold space, as
shown in the figure. Assuming the cycle itself (i.e., inside the
dashed line) still operates as a Carnot refrigerator, find the electric
power needed to generate the 3-tons of cooling capacity, the daily
cost for this electricity, and COPR.
Environment=20°C
QH
QH
Q₁
Q₁
Cold Space=0°C
35°C
W
-15°C

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