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

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Refrigeration and Air Conditioning
A refrigeration system

Removes heat from a high temperature body and delivers it to a low temperature body
None of the listed here
Rejects energy to a low temperature body
Removes heat from a low temperature body and delivers it to a high temperature body

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