2. • It Is unit of refrigeration.
• The rating of a refrigeration machine is given by a standard unit of
refrigeration called Ton of Refrigeration.
• One ton of refrigeration (1TR) means capacity to freeze 1 ton of water
from and at 0’ in 24 Hrs.
• In USA 1 ton is taken as 2000lbs and its latent of fusion 144 B.Th. U/lb
(334.9 KJ/Kg).
1 TR = (2000x144)/24
= 12000 B Th U/hr
= 200 B Th U /Min
1 B Th U =1.055 KJ
1 TR =200 x1.055 KJ/Min
= 211 KJ/Min
1 TR = 3.517 KJ/s or KW
TR - Tons of Refrigeration
