Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Evaporator and compressor
Condenser and receiver
Receiver and evaporator
Compressor and condenser

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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 leads to significant cost reduction
It improves the C.O.P., as the condenser is small
It considerably reduces mass of the system

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