Refrigeration effect produced by one tonne of ice cube is known as 1TR.... 

Rate of heat removal required to convert 1 Tonne of water at 0°C to 1 Tonne of ice at 0°C in 24 hour is known as 1 Tonne refrigeration. 

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.