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
The positive work in isentropic expansion of liquid is very small
It considerably reduces mass of the system
It leads to significant cost reduction

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Refrigeration and Air Conditioning
The reciprocating refrigerant compressors are very suitable for

Small displacements and high condensing pressures
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Large displacements and low condensing pressures

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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 dehumidification
Cooling and humidification
Dehumidification and pure sensible cooling
Dehumidification

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