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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/hK
m/h
m²/hK

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Carbon dioxide
Sulphur dioxide
Ammonia
R-12

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
R-12
R-11
Ammonia

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Restriction to refrigerant flow
Corrosion of steel plates
All of these
Freezing at the expansion valve

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Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Heat of compression
All of these
Enthalpy increase in compressor
Work done by compressor

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

Four heat exchangers
Three heat exchangers
Two heat exchangers
One heat exchanger

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