Ton of refrigeration

ton of refrigeration
Unit ofPower
SymbolTR
Conversions
1 TR in ...... is equal to ...
   SI units   3.51685 kW
   Non-SI metric   3,025.97 kcal/h
   US Customary and Imperial   12,000.00 BtuIT/h
2,593.90 ft⋅lbf/s

A ton of refrigeration (TR or TOR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours.[1][2]

The modern definition is exactly 12,000 BtuIT/h (3.516853 kW). Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of refrigeration). Many manufacturers also specify capacity in Btu/h, especially when specifying the performance of smaller equipment.

  1. ^ Marks' Standard handbook for Mechanical Engineers, 8th Ed., McGraw Hill, p. 19–3
  2. ^ "NIST Guide to the SI". National Institute of Standards and Technology. Retrieved 2007-05-18.