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