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Question

A Carnot refrigerator extracts 150 kJ of heat per minute from space which is maintained at 23C and is discharged to atmosphere at 27C. The work required to run the compressor is

A
40 kJ/min
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B
20 kJ/min
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C
10 kJ/min
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D
30 kJ/min
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Solution

The correct option is D 30 kJ/min
TR=23+273=250K,

To=27+273=300K

(COP)carsot=TRToTR=250300250=5

Now, RC = 150 kJ/min

COP=RCP

P=1505=30kJ/min

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