In a mechanical refrigerator, the low temperature coils of the evaporator are at -23°C and the compressed gas in t}le condenser has a temperature of 77°C. The coefficient of performance is
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a
70%
b
20%
c
0.23
d
2.5
answer is D.
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Detailed Solution
β=T2T1âT2,T1=77âC=350K and T2=â23âC=250K β=250350â250=250100=2â 5