Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and humidified
Cooled and dehumidified
Heated and dehumidified
Heated and humidified

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

The positive work in isentropic expansion of liquid is very small
It considerably reduces mass of the system
It improves the C.O.P., as the condenser is small
It leads to significant cost reduction

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