摘要
鉴于真空冷冻干燥机制冷工质R22将于若干年后被淘汰(发达国家2020年前淘汰,发展中国家2040前被淘汰,中国可能于2030年前淘汰),为此上海远东制药机械总厂冻干设备厂进行了一系列实验研究,最终采用R404A替代R22,并取得了成功。R404A替代R22前几年已在中央空调、低温热泵、商业制冷机上获得应用(制冷温度一般在-30℃以上,常见诸报道),但在冷冻干燥低温领域(制冷温度-60～-80℃)尚未见有报道。
R22 which is in common use for vacuum freezing dryer will be out of market at 2030 therefore Shanghai YUANDONG has done a lot of experimental researches to use the R404a instead of R22 and finally succeeded. R404a has been applied to HAVC, low temperature heat pump area, and commercial refrigerant system （freezing temperature below -30℃） for several years. This article gived some introduce of R404a which used in vacuum freezing dryer （freezing temperature of -60-80℃）.
关键词
真空冷冻干燥机
制冷剂替代
环保
vacuum freeze dryer
alternative refrigerant
environment-friendly
