A refrigerator that consumes 3 kW of electricity when running and has a coefficient of performance of 1.5 is placed in a well-sealed room, and is plugged in with its door open. The rate of cooling or heating this refrigerator will provide to the air in the room when running is

Question

Engineering

Korbin Sherman

11 March, 23:31

A refrigerator that consumes 3 kW of electricity when running and has a coefficient of performance of 1.5 is placed in a well-sealed room, and is plugged in with its door open. The rate of cooling or heating this refrigerator will provide to the air in the room when running is

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Answers (1)

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Dwayne Ferguson · Answer 1

The 3 kW input power would go in heating the well-sealed room as an overall result regardless of the coefficient of performance.

Explanation:

The answer is 3 kJ/s, or 3 kW, same as the work input. If it was higher, then energy would come out of thin air, if it was lower then energy would be destroyed.

A classic First Law of Thermodynamics question.

The first law of thermodynamics, also known as Law of Conservation of Energy which states that energy can neither be created nor destroyed.

It results in that energy can only be transferred or changed from one form to another.

The 3 kW input power would go in heating the well-sealed room as an overall result regardless of how much is the coefficient of performance.