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一些氯氟烃(如R12)或它们故混合物(如R502)因其具有无毒和不可燃性,常称之为安全制冷剂。自30年代初用一些氯氟烃作制冷剂以来,大大地推动了制冷技术的发展及开拓了制冷技术的应用领域(例如在美国就有近一亿台家用制冷设备。)但是近一、二十年来的研究表明,R12等氯氟烃制冷剂排放到大气中去以后,能够不发生分解地上升到距地面15～50公里的同温层,一方面使臭氧层遭到破坏,另一方面,大气中氯氟烃气体浓度的增大也可能是使地球出现“温室效应”的原因之一。因此,自70年代起,一些国际
Some chlorofluorocarbons (such as R12) or their mixtures (such as R502) are often referred to as safe refrigerants because of their non-toxic and non-flammable properties. Since the early introduction of some chlorofluorocarbon refrigerants in the early 1930s, the development of refrigeration technology has been greatly promoted and the application of refrigeration technology has been opened up (for example, there are nearly 100 million domestic refrigeration equipment in the United States.) However, nearly one and two Decades of research have shown that after the CFC refrigerant such as R12 is released into the atmosphere, it can rise to the stratosphere 15 to 50 kilometers away from the ground without being decomposed, and on the one hand, the ozone layer is destroyed. On the other hand, The increase in atmospheric concentrations of chlorofluorocarbons may also be one of the causes of the “greenhouse effect” on Earth. Therefore, since the 1970s, some international