Refrigeration and Air Conditioning
In which of the following refrigeration system, waste heat can be effectively used?

Vapour compression cycle
None of the listed here
Vapour absorption cycle
Air refrigeration cycle

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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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