Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(h2 - hA)/ (h1 - h2)
(hA - h2)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h1 - h2)/ (hA - h2)

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Refrigeration and Air Conditioning
The relative humidity is defined as

The mass of water vapour present in 1 m3 of dry air
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure
The mass of water vapour present in 1 kg of dry air
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

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