Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
Heat supplied by the gas burner to the heat absorbed by the evaporator
Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner

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Refrigeration and Air Conditioning
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

0.622 Pv / (Pb - Pv)
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
μ/[1 - (1 - μ) (Ps/Pb)]
None of these

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