In a refrigerator, the low temperature coil of evaporator is at -23℃ and the compressed gas in the condenser has a temperature of 77℃. The amount of…

Question

In a refrigerator, the low temperature coil of evaporator is at -23℃ and the compressed gas in the condenser has a temperature of 77℃. The amount of electrical energy spent in freezing 1 kg of water at 0℃ is

MARKS Content Team · Accepted Answer

Correct answer: (A) 134400 J. COP=T_2/(T_1-T_2)=(273-23)/(273+77-273-23)=250/100=2.5 As COP=Q_2/W ∴ 2.5=(1000×80×4.2)/W or W=(1000×80×4.2)/2.5=134400 J

In a refrigerator, the low temperature coil of evaporator is at $- 23 ℃$ and the compressed gas in the condenser has a temperature of $77 ℃$ . The amount of electrical energy spent in freezing 1 kg of water at $0 ℃ is$

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