Freon refrigerant 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 and other refrigerants that are similar.
R22 refrigerant is not easy to burn and explode, but when R22 comes into contact with an open flame, it will decompose a toxic gas called (CoCl2). Therefore, if an open flame is to be used when servicing the refrigeration compressor, the refrigeration system should be fully ventilated (blowing).
R22 refrigerant can work at a temperature of 135-150℃ for a long time in steel and copper containers, and it will gradually decompose when the temperature exceeds the temperature. It interacts with refrigerating oil, in addition to acid and water, it can free the carbon in the oil to form carbon deposits, and in the case of coexistence with iron, it will decompose when the temperature reaches 550°C.
The standard boiling point of R22 is -40. 8℃. R22 is a medium-temperature refrigerant. When water is used as a cooling medium, its condensation pressure should generally not exceed 1.53 MPa. When the wind is used as a cooling medium, the condensing pressure should generally not exceed 2.16MPa (except for tropical air-conditioning).
The solubility of R22 refrigerant in water is more than 10 times greater than that of R12 and the lower the temperature, the higher the proportion of its water content. Therefore, it is required that the water content in R22 does not exceed 40-60mg/L when used.
R22 refrigerant dissolves slightly with lubricating oil, dissolves in the compressor pump casing and condenser, and separates in the evaporator, and 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 refrigerant has good electrical properties and excellent insulation properties, but it has a high dielectric constant and low insulation resistance during liquefaction. The high dielectric constant means that there is a greater tendency for the insulation resistance to decrease due to trace impurities. For example, when mixed with lubricating oil, the insulation strength will decrease sharply. Therefore, when used in a closed system, special attention should be paid to whether the electrically insulating material contains impurities.
The specific nature of the refrigerant will directly affect the cooling effect of the entire refrigeration system, so we must understand the characteristics of the R22 refrigerant. If you want to know more about R22 refrigerant after reading the above content, you can get professional solutions by contacting us.
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