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

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Refrigeration and Air Conditioning
The reciprocating refrigerant compressors are very suitable for

Large displacements and low condensing pressures
Small displacements and low condensing pressures
Small displacements and high condensing pressures
Large displacements and high condensing pressures

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