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Question

The coefficient of performance of a carnot refrigerator is 5/3. If the refrigerator operating at an intake temperature of 23C, then what will be the exhaust temperature?

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Solution

Given:
Coefficient of performance, β=53
Source temperature, T1=23°C=(23+273)K=250K
To find:
Exhaust temperature, T2=?
We know the coefficient of performance,
β=T2T1T253=T2250T212505T2=3T28T2=1250T2=156.25K=(156.25273)°C=116°C
Hence, the exhaust temperature is -116°C

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