Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

The mass of water vapour present in 1 kg of dry air
The mass of water vapour present in 1 m³ 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
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

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Refrigeration and Air Conditioning
The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

(td₁ -td₃)/( td₂ -td₃)
(td₃ -td₁)/( td₂ -td₃)
(td₂ -td₃)/( td₁ -td₃)
(td₃ -td₂)/( td₁ -td₃)

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Refrigeration and Air Conditioning
It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be

Cooling and dehumidification
Dehumidification
Dehumidification and pure sensible cooling
Cooling and humidification

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