Refrigeration

Refrigeration
Refrigeration is defined as the process of removing heat from a substance under controlled condition or it means a continous extraction of heat from a body whose temperature is already below the temperature of surroundings.
Unit of Refrigeration
Practical Unit of refrigeration is expressed in terms of tonne of refrigeration (TR)
Which is defined as the amount of refrigeration effect produced by the uniform melting of 1 tonne of ice from and at 0 degree celcius in 24 hours.

latent heat of ice =335 KJ/Kg
1TR =1000*335/(24*60)
=232.6 KJ/min
In actual practice 1 tonne of ice is taken as equalent to 210 KJ/min or 3.5KW or KJ/s