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Their largest plant (located in Roseville, California) produced 1,200 short tons (1,100 t) of ice daily, and Roseville's docks could accommodate up to 254 cars. At the industry's peak, 1,300,000 short tons (1,200,000 t) of ice was produced for refrigerator car use annually.
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 Btu IT /h (3.516853 kW). Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of ...