Refrigerant R22 and R410A, which is better?
R22 and R410A are commonly used in central air conditioners. However, the average user does not understand the difference between the two refrigerants, and does not know which refrigerant to use. Let's take a look at these two refrigerants together.
1. What is R22 and R410A?
1. The chemical name of R22 is difluorochloromethane, which is a member of the Freon family and belongs to hydrochlorofluorocarbons.
Prior to the advent of the R410A, most of the refrigerant used in air conditioners was R22. Because this refrigerant is very harmful to the ozone layer, it will be completely phased out by 2020 according to the Montreal Protocol.
2. R410A is a new type of refrigerant.
R410A new refrigerant is made up of two quasi-azeotropic mixtures, mainly composed of hydrogen, fluorine and carbon. It is stable, non-toxic and superior in performance. At the same time, since it does not contain chlorine, it will not react with ozone, that is, it will not destroy the ozone layer.
In addition, air conditioners using new refrigerants will also have some improvement in performance. R410A is the most widely used refrigerant to replace R22, and has been popularized in Europe, America and Japan.
Second, why should I replace R22 with R410A?
1. R410A is low in toxicity and shows no combustion propagation.
2. The ozone layer damage coefficient of R410A is 0, and the ozone layer destruction coefficient of R22 is 0.05.
3. When using R410A, the total heat transfer characteristics of the system are larger than R22, so the system efficiency can be improved and the heat transfer area of the heat exchanger can be reduced.
Third, the different characteristics of R410A and R22
1. R410A is a refrigerant obtained by mixing HFC-32 (R32) and HFC-125 at a weight ratio of 50%, and is a near-azeotropic mixed refrigerant. R22 is a single substance refrigerant.
2. The operating pressure of R410A is about 50~70% higher than R22.
3. R410A has a higher vapor density than R22. For systems of the same capability, the required mass flow rate of the refrigerant is the same. Since the gas piping is the same diameter, the R410A vapor flow rate is about 30% slower than that of R22.