欧美的空调制冷工程师们已重新认识到,基于螺杆式压缩机使用对环境安全的制冷剂HCFC22的机组的优越性,越来越多的制冷机制造商正向这一市场进军。制冷剂生产商们正在探索可以替代R11、R12的新工质,然而,任何其它新的代用品都将使造价昂贵,而效率比所替代工质要低,且应用于现有机器上并不是一拍即合。颇有吸引力的代用品就是R22,一种广泛应用于民用建筑及商业空调达数十年之久的 Air-conditioning and refrigeration engineers in Europe and the United States have re-recognized that more and more refrigerator manufacturers are entering this market based on the superiority of screw-type compressors in using HCFC22 units that are environmentally safe refrigerants. Refrigerant manufacturers are exploring new refrigerants that can replace R11 and R12, however, any other new substitute will make it expensive and less efficient than the replacement and will not work on existing machines Hit it off. The attractive alternative is R22, a widely used in residential and commercial air-conditioning for decades