A refrigerator is to maintain eatables kept inside at 9^oC. If room temperature is 36 ^oC, calculate the coefficient of performance.

A refrigerator is a device which is maintained at some low temperature by transferring heat to surrounding at high temperature We know coefficient of performance of a refrigerator in terms of temperature is given by the relation

Where is the coefficient of Performance , T₂ is temperature of surrounding , T₁ is the temperature at which refrigerator is maintained

we are given temperature of refrigerator

T₁ = 9 ^oC

Converting it to Kelvin

T₁ = 9 + 273 = 282 K

and we are given temperature of surrounding

T₂ = 36 ^oC

Converting it to Kelvin

T₂ = 36 + 273 = 309 K

So we the coefficient of performance is

= 10.44

So the coefficient of performance of refrigerator is 10.44