Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
One tonne is the total mass of machine
One tonne of water can be converted into ice
One tonne refrigerant is used

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

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

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Refrigeration and Air Conditioning
One ton of the refrigeration is

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
The refrigeration effect to produce 1 ton of ice at NTP conditions

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Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
Heat supplied by the gas burner to the heat absorbed by the evaporator
Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

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