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Q. 9

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 594

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Short Answer

Do the energy-transfer diagrams in represent possible refrigerators? If not, what is wrong?

a. The figure is not refrigerator ,because this engine dumps heat in the cold reservoir which is not a refrigerator does.

b. In figure ,so it is refrigerator engine.

c. In figure ,so it is not refrigerator engine.

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Step by Step Solution

Step 1: Possible of refrigerators for part a

a.

Work is used to compress a coolant and raise its temperature over that of the surrounding environment.

Consider the figure of part a,

Step 2: Possible of refrigerators for part b

b.

Consider the part b of figure,

The efficiency of normal refrigerator engine is,

The efficiency of carnot refrigerator engine is,

So it's a possibility.

Step 3:  Possible of refrigerators for part c

c.

Consider the figure,

The efficiency of normal refrigerator engine is,

The efficiency of carnot refrigerator engine is,

So it's a possibility.

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