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 humidification
Cooling and dehumidification
Dehumidification and pure sensible cooling
Dehumidification

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Refrigeration and Air Conditioning
A good refrigerant should have

High operating pressures and low freezing point
High latent heat of vaporisation and low freezing point
High specific volume and high latent heat of vaporisation
Low C.O.P. and low freezing point

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