Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Expansion valve and evaporator
Compressor and evaporator
Compressor and condenser
Condenser and expansion valve

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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

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

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