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  4. A refrigerator works between temperature -10° C and 27° C, the coefficient of performance is :

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Q. A refrigerator works between temperature $-10^{\circ} C$ and $27^{\circ} C$, the coefficient of performance is :

Solution:

$COP =\frac{ T _{2}}{ T _{1}- T _{2}}$
$T _{1}=300\, K$
$T _{2}=263\, K$
$COP =\frac{263}{300-263} $
$=7.1$