Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

Any value
As low as possible (3 to 11°C)
High, of the order of 25°
Zero

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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 refrigerant is used
One tonne of water can be converted into ice

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