Identify the difference in application of refrigerant R134a and R22 refrigerant

At present, for the layman, the impression of fluorine refrigerants is still at the beginning of the original Freon, which pollutes the atmosphere seriously and is the chief culprit of the greenhouse effect. So much attention was paid to fluorine refrigerants in the later period, and rapid development. From R12 refrigerant to R22 refrigerant, to R134a refrigerant and R410A and other new environmentally friendly refrigerants are widely used. In recent years, environmental protection has become one of the hot issues of concern in various industries. Everyone is paying more and more attention to environmental protection issues. A comparison between refrigerant R22 refrigerant and R134a refrigerant is made to determine which refrigerant is more environmentally friendly and more practical?

The so-called environmentally friendly refrigerants R134a, r410a and R407C also belong to the Freon family, so the concept of fluorine prohibition confuses the content that should not be prohibited. The so-called ban on fluorine in various media refers to the ban on the use of CFCs, not HCFCs and HFCs. There is still a big difference between the two.

The main application of refrigerant R134a and R22 refrigerant

R134a refrigerant is the most widely used medium and low temperature environmentally friendly refrigerant, due to the good integration of R-134a The performance makes it a very effective and safe alternative to R12, which is mainly used in most areas where R12 refrigerant is used, including: refrigerators, freezers, water dispensers, automobile air conditioners, central air conditioners, dehumidifiers, cold storage, commercial Refrigeration, ice water machine, ice cream machine, freezing and condensing unit and other refrigeration equipment, and can also be used in aerosol propellants, medical aerosols, insecticide propellants, polymer (plastic) physical foaming agents, and magnesium Alloy shielding gas, etc. R134a refrigerant can be widely used as a refrigerant in automobile air conditioners, refrigerators, central air conditioners, commercial refrigeration and other industries, and can be used in medicine, pesticides, cosmetics, and cleaning industries.

As the most widely used medium and low temperature refrigerant today, R22 is mainly used in household air conditioners, commercial air conditioners, central air conditioners, mobile air conditioners, heat pump water heaters, dehumidifiers, refrigeration drying Refrigeration equipment such as refrigerators, cold storage, food refrigeration equipment, marine refrigeration equipment, industrial refrigeration, commercial refrigeration, refrigeration condensing units, supermarket display cabinets, etc. Difluoromonochloromethane can also be used as a raw material for the production of polytetrafluoroethylene resin and an intermediate for fire extinguishing agent 1121, as well as a physical foaming agent for polymers (plastics).

Analysis of the characteristics of refrigerant R134a and R22 refrigerant

1. The thermal conductivity of R134a is 10% lower than that of R22, so R134a The heat exchange area of u200bu200bthe heat exchanger of the unit needs to be larger.

2. The water absorption of R134a is very strong, which is 20 times that of R22, so the dryer in the unit system has higher requirements to avoid ice blocking.

3. The specific volume of R134a is 1.47 times that of R22, and the latent heat of evaporation is small, so the refrigeration capacity of the R134a unit is only 60% of that of the R22 unit. Calculated according to the price of unit cooling capacity, the price of the R22 unit is about 60% of that of the R134a unit.

4. R134a and R22 are both greenhouse gases.

5. The Ozone Depletion Potential (ODP) of R134a is 0 and R22 is 0.06. This is the reason why R134a has become an environmentally friendly refrigerant.

6. R134a has a stronger swelling effect on rubber substances than R22, and the refrigerant leakage rate is higher in actual operation. In addition, it is highly corrosive to copper, and 'copper plating' occurs during use, so additives must be added to the system.

7. The R134a system requires a dedicated compressor and dedicated grease lubricating oil. Due to its high water absorption, high foaming and high diffusibility, grease lubricating oil is stable in system performance. Inferior to the mineral oil used in the R22 system.

8. The price of HFCs refrigerants such as R134a and their special lipid oils is higher than that of R22, and the operation and maintenance costs of the equipment are higher.

Compared with R134a environmentally friendly refrigerants at this stage in my country, R22 refrigerant still has the advantages of high efficiency, stability and low price. It will also be used in the application of large refrigeration units. In an advantageous position, R22 refrigerant can be consumed until 2040 before the ideal refrigerant is born. The above is the difference between the use of refrigerant R22 and R134a. From this we can also see that there is no ideal refrigerant in the short term. The development of environmentally friendly refrigerants needs continuous improvement, looking for the best performance, application, cost and other aspects. Suitable refrigerant models require global efforts in the future.

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