[Er.Pankaj Garg]

Unit of refrigeration
A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the rate of heat transfer that results in the melting of 1 short ton of pure ice at 0 °C (32 °F) in 24 hours.

Unit of refrigeration Domestic and commercial refrigerators may be rated in kJ/s, or Btu/h of cooling. Prior to the introduction of mechanical refrigeration, cooling was accomplished by delivering ice. Installing one ton of mechanical refrigeration capacity replaced the daily delivery of one ton of ice.

Latent heat of ice (i.e., heat of fusion) = 333.55 kJ/kg = 144 Btu/lb

One short ton = 2000 lb = 907 kg

Heat extracted   = 2000 x 144/24 hr   = 288000 Btu/24 hr   = 12000 Btu/hr   = 200 Btu/min

1 ton   = 200 Btu/min   = 3.517 kJ/s   = 3.517 kW   = 4.713 HP


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[jirzasogna]

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