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A ton of refrigeration (commonly abbreviated as TR) 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 is defined as the heat of fusion absorbed by melting of pure ice at in 24 hours.〔Marks' Standard handbook for Mechanical Engineers, 8th Ed., McGraw Hill, p. 19–3〕〔(【引用サイトリンク】title=NIST Guide to the SI )〕 It is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. A refrigeration ton is approximately equivalent to . 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. ==See also== * British thermal unit * HVAC * Joule * Kilowatt * Short ton * Ton 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ton of refrigeration」の詳細全文を読む スポンサード リンク
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