Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Increases heat transfer rate
Can be avoided by proper design
Is immaterial
Results in loss of heat due to poor heat transfer

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

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

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