Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when

None of the listed here
Its bulb is surrounded by a wet cloth exposed to the air
It is not affected by the moisture present in the air
The moisture present in it begins to condense

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The refrigeration effect to produce 1 ton of ice at NTP conditions
The cooling effect produced by melting 1 ton of ice
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The standard unit used in refrigeration problems

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Refrigeration and Air Conditioning
A good refrigerant should have

Low C.O.P. and low freezing point
High specific volume and high latent heat of vaporisation
High latent heat of vaporisation and low freezing point
High operating pressures and low freezing point

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