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

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, 134400 J, 1344 J, 80000 J, 3200 J

MARKS App · Accepted Answer

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

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