UNIT OF REFRIGERATION

The capacity of a refrigeration unit is given in tons of refrigeration. A ton of refrigeration is defined as the quantity of heat to be removed in order to form one ton of ice in 24 hours when the initial temperature of water is 0°C. 1 ton of refrigeration, TR = 211 kJ/min or 3.5167 kW. Taking latent heat of freezing of water equal to 336 kJ/kg, we have

Coefficient of performance (COP): The COP of a refrigeration system is a ratio of the heat removed (cooling effect produced) from a system to the work supplied to achieve the heat removal.

where P = energy required in kW

T_n = capacity of plant in tons