Refrigeration and Air Conditioning
In Electrolux refrigerator

Ammonia is absorbed in water
Hydrogen evaporates in ammonia
Ammonia evaporates in hydrogen
Ammonia is absorbed in hydrogen

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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
It considerably reduces mass of the system
It leads to significant cost reduction
The positive work in isentropic expansion of liquid is very small

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