Refrigeration and Air Conditioning
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

Absorber, generator and liquid pump
Liquid pump
Absorber and generator
Generator

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with plants and cause greenhouse effect
These react with ozone layer
These react with water vapour and cause acid rain
These react with oxygen and cause its depletion

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