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

It leads to significant cost reduction
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

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Refrigeration and Air Conditioning
In a saturated air-water vapour mixture, the

Dry bulb, wet bulb and dew point temperature are same
Dew point temperature is lower than wet bulb temperature
Dry bulb temperature is higher than wet bulb temperature
Dry bulb temperature is higher than dew point temperature

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