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

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

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Refrigeration and Air Conditioning
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

Which is lower than the dew point temperature of the incoming stream
Which lies between the wet bulb and dew point temperatures of the incoming stream
Of adiabatic saturation of incoming stream
Which lies between the dry bulb and wet bulb temperatures of the incoming stream

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