Common refrigerants

Update:10 Feb 2020
Summary:

There are many kinds of refrigerants. This paper briefl […]

There are many kinds of refrigerants. This paper briefly introduces Freon 12 and 22, R410A
Freon 12
a. Freon 12 (cf2cl2) code R12 Freon 12 is a colorless, odorless, transparent, almost non toxic refrigerant, but when the air content is more than 80%, it will cause suffocation. Freon 12 does not burn or explode. When it is in contact with an open fire or at a temperature above 400 ℃, it can decompose hydrogen fluoride, hydrogen chloride and phosgene (CoCl2) harmful to human body. R12 is a widely used medium temperature refrigerant, suitable for small and medium-sized refrigeration systems, such as refrigerators, freezers, etc. R12 can dissolve a variety of organic matters, so it is not allowed to use ordinary rubber gasket (ring), usually chloroprene rubber or butadiene rubber sheet or sealing ring. [10]
Freon 22
b. Freon 22 (chf2cl) code R22 R22 does not burn or explode, and its toxicity is slightly greater than R12. Although the solubility of water is greater than R12, it may cause "ice jam" in the refrigeration system. R22 can partially dissolve with lubricating oil, its solubility changes with the type and temperature of lubricating oil, so the refrigeration system using R22 must have oil return measures. [11]
The corresponding evaporation temperature of R22 under standard atmospheric pressure is - 40.8 ℃, the condensation pressure under normal temperature is not more than 15.68 × 105 PA, and the refrigerating capacity per unit volume is more than 60% larger than R12. R22 refrigerant is mostly used in air conditioning equipment
R410A
c. R410A: it is a new type of environmental protection refrigerant, and its working pressure is about 1.6 times of that of ordinary R22 air conditioner,
Higher cooling (heating) efficiency. Improve the performance of air conditioning without destroying the ozone layer. R410A new refrigerant is composed of two quasi azeotropic mixtures, mainly composed of hydrogen, fluorine and carbon elements (HFC). It is stable, nontoxic and excellent in performance. At the same time, because there is no chlorine element, it will not react with ozone, that is, it will not damage the ozone layer. In addition, the performance of air conditioning with new refrigerant will also be improved. R410A is internationally recognized as the most suitable refrigerant to replace R22, and it is widely used in Europe, America, Japan and other countries. The global trend and Prospect of R410A replacement in major international markets and the trend of entering the international market.