A one tonne refrigerating machine means that

A one tonne refrigerating machine means that Correct Answer One tonne of ice when melts from and at 0°C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

1 tonne of refrigeration is the rate of heat removal required to freeze a metric ton (1000 kg) of water at 0°C in 24 hours. Based on the heat of fusion being 333.55 kJ/kg, 1 tonne of refrigeration = 13,898 kJ/h = 3.861 kW
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