Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

T₂/ (T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₁ / (T₂ - T₁)

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