A mini-fridge needs to maintain a temperature of 277 K. The air outside the mini

Question

A mini-fridge needs to maintain a temperature of 277 K. The air outside the mini-fridge has a temperature of 306 K. Every fifteen minutes, 2.32 × 105 J of energy is transferred out of the mini-fridge and 2.9 × 105 J of energy is transferred into the surrounding air.

1) What is the power output (that is, the work done per second) of the compressor in the mini-fridge?

2)What is the coefficient of performance of this mini-fridge?

3)If this mini-fridge were instead cooled by a Carnot engine used as a refrigerator, what would its coefficient of performance be?

4)If the mini-fridge were cooled by a Carnot engine, how much energy would be transferred out of the mini-fridge every fifteen minutes if the power output of the compressor was the same as above?

Explanation / Answer

a)power out put=(2.9 × 105-2.32 × 105)15X60=0.58X105/900 calculating we will get the answer.

b)the coefficient of performance of this mini-fridge=1-(277/306) calculating we will get the answer.

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