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Q. 33

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 596

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Short Answer

The coefficient of performance of a refrigerator is. The compressor usesof energy per cycle.

a. How much heat energy is exhausted per cycle

b. If the hot-reservoir temperature is, what is the lowest possible temperature inof the cold reservoir?

a.Heat energy is exhausted per cycle is.

b.Lowest possible temperatureis.

See the step by step solution

Step by Step Solution

Step 1: Calculation for heat energy is exhausted per cycle  (part a)


As a result of the first law that was applied to refrigerators, we now have

Substituting this we get,

Step 2: Calculation for lowest possible temperature (part b)


When the coefficient of performance is that of a Carnot refrigerator, the lowest value of the temperature of the cold reservoir is reached.

That is,

The value of the lower temperature can be separated as follows:

The minimum temperature ,

In degrees centigrade,

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