R22 refrigerant will be replaced by a new environmentally friendly refrigerant

At present, countries around the world are phasing out traditional refrigerants such as R22, and advocate the use of environmentally friendly refrigerants. Countries are racing to carry out research on R22 refrigerant alternative technology. After several years of experimentation and evaluation, the more mature refrigerant substitutes for R22 are as follows:

1. R407c refrigerant: It is the most popular R22 substitute among many candidate alternative refrigerants. This is because the thermal properties of R407c are similar to R22, and their working pressure and cooling capacity are relatively close. This makes the replacement simple and easy. After the original R22 machinery and equipment are changed to R407c refrigerant, except for replacing the lubricating oil, adjusting the system injection volume and throttling components, the compressor and other equipment can be unchanged. However, the cooling capacity and energy efficiency ratio of the machine after using R407c are slightly lower than when using R22, and the big defect of R407c refrigerant may be the large temperature slip.

2. 134a refrigerant: This non-azeotropic mixture has good thermodynamic properties at 30/70%. Many reports have pointed out that the cooling capacity of air-conditioning equipment after the optimization of the system injection volume and heat exchanger adopts this mixed working fluid is completely equivalent to R22, and the energy efficiency ratio can be increased by several percentage points. Its disadvantage is that it is flammable under certain conditions, although it is non-flammable under normal working conditions.

3. r410a refrigerant: Its thermal performance is very close to that of a single working fluid. Although its thermal properties are not very similar to R22, it may be a promising HFC substitute for R22. The refrigeration system using R410a needs to be modified, but the modified machine becomes more compact. Its other advantage is the high thermal conductivity of the liquid phase and low viscosity, which makes it have better transmission characteristics than R22. R410a refrigerant has a higher energy efficiency ratio than R22 after optimization in a proper pressure range, and the overall efficiency can be increased by about 5% at the same cost, which is enough to make up for the cost of retrofit design.

Fourth, R134a refrigerant: Compared with R22, the pressure and cooling capacity will be reduced. Most of the pipelines, including the heat exchanger, should be expanded to reduce pressure loss, and the displacement of the compressor should also be increase. After replacing R22 with it, the refrigeration capacity of the system has dropped drastically, and the energy efficiency ratio has also dropped slightly. The cost of system modification is relatively high, so it is unlikely to use it for small residential or commercial air conditioners, but it is more suitable for large chillers, especially when screw or centrifugal compressors are used.

Generally speaking, refrigerant replacement is not only as simple as Ru0026D and trial production, but also requires companies to invest a lot of manpower and material resources and experience a long period of time to complete, so R22 refrigerant will still be used by consumers Used for a period of time, it will be eliminated by the new environmentally friendly refrigerant.

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