First slide

Refrigerator

Question

An ideal refrigerator has a freezer at a temperature of -13 °C. The coefficient of performance of the engine is 5.The temperature of the air (to which heat is rejected) will be :

Easy

A

325°C
B

325 K
C

39°C
D

320°C

Solution

$COP = \frac{T_{2}}{T_{1} - T_{2}} \Rightarrow 5 = \frac{260}{T_{1} - 260} \Rightarrow T_{1} = 312 K = 39^{o} C$

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