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R2 90具有较高的汽化潜热和较大的容积制冷量 ,它的ODP、GWP都为零 ,是一种优秀的绿色天然环保工质 ,因而倍受欧洲人的重视 ,在欧洲使用R2 90的空调器、电冰箱总量已超过 10 0 0万台。然而因其具有可燃性而遭美国、日本的抵制 ,在我国也存在较大的分歧。为此我们对R2 90的可燃性、相容性和经济性进行了实验和分析 ,发现R2 90的燃烧和爆炸需要 2个条件 ,即与空气的混和浓度要在 2 .5 %～8.9%之间 ,温度在 810℃以上。在机组运行过程中 ,2个小概率事件同时出现的概率几乎为零 ,因此 ,只要在设计和运行中采用必要的防范措施 ,在制冷机组中使用R2 90为工质同样是安全的。
R2 90 has a high latent heat of vaporization and a large volumetric cooling capacity, its ODP, GWP are zero, is an excellent green natural environmental refrigerant, which is much European attention, the use of R2 90 in Europe Air conditioners, refrigerators total more than 10 million units. However, because of its combustibility, it was boycotted by the United States and Japan and there are still big differences in our country. For this reason, we have carried on the experiment and analysis to R290 flammability, compatibility and economy, found R290 combustion and explosion need two conditions, namely the air mix density should be in 2.5% ~ 8.9% Between, the temperature is above 810 ℃. During the operation of the unit, the probability of two small probability events occurring at the same time is almost zero. Therefore, it is equally safe to use R290 as a working medium in a chiller unit provided the necessary precautions are taken during design and operation.