Refrigeration and Air Conditioning
A refrigeration system

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