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  4. A refrigerator is to maintain eatables kept inside at 9 degree Celsius. If the room temperature is 36 degree Celsius, then what is the coefficient of performance?

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Q. A refrigerator is to maintain eatables kept inside at $ 9 $ degree Celsius. If the room temperature is $ 36 $ degree Celsius, then what is the coefficient of performance?

J & K CETJ & K CET 2019Thermodynamics

Solution:

Coefficient of performance , $\beta=\frac{T_{2}}{T_{1}-T_{2}}$
$=\frac{273+9}{\left(273+36\right)-\left(273+9\right)}$
$=10.44$