Analyze the characteristics of Freon R-22 refrigerant

Freon is a widely used refrigerant at present. It is the general term for saturated hydrocarbons. It is characterized by slight toxicity, odorless, non-combustible, no explosion hazard, good chemical stability, does not react with water, and has no corrosive effect on metals. . What are the characteristics of the commonly used R-22 refrigerant? Freon is a widely used refrigerant at present. It is the general term for saturated hydrocarbons. It is characterized by slight toxicity, odorless, non-combustible, no explosion hazard, good chemical stability, does not react with water, and has no corrosive effect on metals. . There are many types of Freon. In order to avoid the trouble of writing its molecular formula and to facilitate memory, people have developed a set of simplified codes to represent various Freon refrigerants, such as R12, R22, R502, etc. Let's take R22 (CHLF2) as an example to introduce its characteristics. Other refrigerants are similar.　　　　 R22 is not easy to burn and not easy to explode. When R22 comes into contact with an open flame, it will decompose a toxic gas called (CoCl2). Therefore, when overhauling the open flame for refrigeration compressors, the refrigeration system should be fully ventilated (blowing), and the environment should be ventilated during operation. The container can work at a temperature of 135～150℃ for a long time, and it will gradually decompose if the temperature exceeds the temperature. It interacts with refrigerating oil, in addition to acid and water, it frees the carbon in the oil to form carbon deposits, and in the case of coexistence with iron, it will decompose when the temperature rises to 550°C.　　　　 will show you what are the characteristics of Freon R-22 refrigerant? The standard boiling point of R22 is -40.8℃. R22 is a medium-temperature refrigerant. When water is used as a cooling medium, its condensing pressure should generally not exceed 1.53MPa; when cooled by air, its condensing pressure should generally not exceed 2. 16MPa (except tropical air conditioners). The solubility of 　　　　 water in R22 is more than 10 times greater than that in R12, and the lower the temperature, the higher the proportion of its water content. Therefore, the water content in R22 is required to not exceed 40-60mg/L (parts per million).　　　　R22 is slightly soluble with lubricating oil, and it dissolves in the compressor pump casing and the condenser, and when it is separated in the evaporator, its solubility changes with the change of temperature. R22 has strong permeability and is easier to leak than R12, so its tightness requirements are higher, and the unit volume refrigeration capacity is about 40% larger than R12. R22 has good electrical properties and excellent insulation properties, but the dielectric constant in the liquid phase is high and the insulation resistance is low; the high dielectric constant means that the tendency of the insulation resistance to decrease due to trace impurities is increased, just like the mixture of lubricating oil, The insulation strength will decrease sharply. Therefore, when using Scope 2 in a closed system, special attention should be paid to impurities in the electrical insulation material factory.

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