Chapter-5 2 nd Law
Chapter-5 2 nd Law
Chapter-5 2 nd Law
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.<br />
Coefficient of Performance:<br />
‣ The efficiency of a refrigerator is<br />
expressed in terms of the coefficient of<br />
performance (COP).<br />
‣ The objective of a refrigerator is to<br />
remove heat (Q L ) from the refrigerated space.<br />
For a refrigerator COPR =<br />
<br />
Q<br />
W<br />
L<br />
Desired output<br />
Required input<br />
Q<br />
( or<br />
W<br />
L<br />
net, in net,<br />
in<br />
)<br />
W<br />
net,<br />
in<br />
<br />
Q<br />
H<br />
Q<br />
L<br />
( kJ )<br />
COP<br />
Notice that COPR, can be greater than unity.<br />
R<br />
<br />
Q<br />
H<br />
QL<br />
Q<br />
L<br />
<br />
Q<br />
H<br />
1<br />
Q<br />
L<br />
1
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