A refrigerator is to maintain eatables kept inside at $9^{\circ} C .$ If room temperature is $36^{\circ} C$ calculate the coefficient of performance.
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Temperature inside the refrigerator, $T_{1}=9^{\circ} C =282 K$
Room temperature, $T_{2}=36^{\circ} C =309 K$
Coefficient of performance $=\frac{T_{1}}{T_{2}-T_{1}}$
$=\frac{282}{309-282}$
$=10.44$
Therefore, the coefficient of performance of the given refrigerator is $10.44$
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