Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be higher
Will be lower
Will remain unaffected
May be higher or lower depending upon the nature of non-condensable gases

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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 humidification
Dehumidification
Dehumidification and pure sensible cooling
Cooling and dehumidification

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