A large fridge freezer is to extract 80 kJ of energy every second from inside of the fridge, maintained at temperature of -3 0C, and to dump it to the air outside which is at 30 0 To do so, the fridge consumes 7 kW of electrical energy which is also converted and dissipated as heat to the surrounding air. Calculate the entropy change per second in the surrounding air and that inside the fridge.Show that such a fridge freezer can never be realised in practice.What is the minimal electrical power necessary to achieve the operation of this fridge?If the electrical power used is to remain at 7kJ/s, but we still require to extract 80 kW of heat from inside, what is the lowest temperature in the fridge that we could theoretically hope to achieve?

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Answered: A large fridge freezer is to extract 80…

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 large fridge freezer is to extract 80 kJ of energy every second from inside of the fridge, maintained at temperature of -3 ⁰C, and to dump it to the air outside which is at 30 ⁰ To do so, the fridge consumes 7 kW of electrical energy which is also converted and dissipated as heat to the surrounding air.

Calculate the entropy change per second in the surrounding air and that inside the fridge.
Show that such a fridge freezer can never be realised in practice.
What is the minimal electrical power necessary to achieve the operation of this fridge?
If the electrical power used is to remain at 7kJ/s, but we still require to extract 80 kW of heat from inside, what is the lowest temperature in the fridge that we could theoretically hope to achieve?

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