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Chapter 21: Q. 9 (page 594)

Do the energy-transfer diagrams inFIGUREQ21.9represent possible refrigerators? If not, what is wrong?

Short Answer

Expert verified

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

b. In figure K<Kc,so it is refrigerator engine.

c. In figure K>Kc,so it is not refrigerator engine.

Step by step solution

01

Possible of refrigerators for part a

a.

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

Win=QH鈭�QC

Consider the figure of part a,

20=(10-10)

20鈮�0

02

Possible of refrigerators for part b

b.

Consider the part b of figure,


The efficiency of normal refrigerator engine is,

K=QCWin

K=10/20=0.5

The efficiency of carnot refrigerator engine is,

Kc=T1T2-T1

Kc=300/300=1

So it's a possibility.

03

 Possible of refrigerators for part c

c.

Consider the figure,


The efficiency of normal refrigerator engine is,

K=QCWin

K=20/10=2

The efficiency of carnot refrigerator engine is,

Kc=T1T2-T1

Kc=300/300=1

So it's a possibility.

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