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冰堵一般是指空調制冷系統(tǒng)工作時,在膨脹閥處發(fā)生結冰而形成的堵塞現(xiàn)象。冰堵故障原因是制冷系統(tǒng)中混入了水分,而水結冰造成冰堵。冰堵只能發(fā)生在制冷系統(tǒng)中的節(jié)流部位,即膨脹閥節(jié)流孔處。因為R-12制冷劑與水一般是互不相溶的,當液態(tài)R-12流經(jīng)膨脹閥的節(jié)流小孔時,溫度突然下降,這些混入在液態(tài)制冷劑中的水分就容易在節(jié)流小孔或閥針孔周圍
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Air Conditioning Systems Air conditioning has rapidly grown over the past 50 years, from a luxury to a standard system included in most residential and commercial buildings. In 1970, 36% of residences in the U.S. were either fully air conditioned or utilized a room air conditioner for cooling (Blue, et al., 1979). By 1997, this number had more than doubled to 77%, and that year also marked the
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