Refrigeration and Air Conditioning
One ton of the refrigeration is

The refrigeration effect to produce 1 ton of ice at NTP conditions
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 cooling effect produced by melting 1 ton of ice

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

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