These two years environmental protection become one of the hot issues  , people pay more and more attention to environmental issues, this is embodied in various aspects, such as car odd number, the fluorine forbidden policies, Today we want to talk  about environmental issue for refrigerant.  Compared with refrigerant R22 and R134a ,  determine which gas  more environmentally friendly, more practical.

       

      The so-called green refrigerant R134a , R410A and R407C etc. also belong to the family of freon, so the concept of fluorine bans confuse the ban and should not be banned content. The ban fluorine refers to the various media banned  CFCs material, and not HCFCs and HFCs.

       

       Application characteristic analysis  of R22 and R134a  as follows:

1. A 10% drop in R134a of thermal conductivity than that of R22, so R134a  unit heat exchanger heat transfer area need to be bigger. 

2. R134a has a strong water imbibition, 20 times than that of R22, so greater demands of the dryer in the unit system, to avoid ice blocking phenomenon.

3. R134a has a specific volume is 1.47 times than that of R22 and latent heat of evaporation is small, so R134a unit refrigerating capacity  is only 60% of R22 unit. Calculated on unit refrigerating capacity price, the price of R22 unit about  60% of the R134a unit.

4. R134a and R22 both belongs to the greenhouse gas 

 

5. R134a??s  ODP  is 0, R22 is 0.06, this is the reason for R134a become environmentally friendly refrigerants.

6. R134a is stronger than that of R22 in rubber material swelling effect , in actual operation and mid-cooling medium leakage rate is higher. In additional , copper corrosion resistance is stronger, in use process will happen "copper plating phenomenon", so must add additive in the system.

7. R134a system requires a dedicated compressor and special lipid lubricating oil, lipid lubricating oil has high water absorbability, high foaming ability and high diffusivity, on the stability ,the system performance is inferior to R22 system used  mineral oil.

8. R134a such as all kinds of HFCs refrigerant and its special lipid oil prices are higher than that of R22, the operation of the equipment maintenance cost is higher.

   HFCs called environmental protection refrigerants of other refrigerant like R410A, R404A, R407C, although in terms of efficiency is superior than R134a, but there is also work pressure is too high, the piping components optimization and high pressure requirements, must improve the heat exchanger and unit design, investment, operation maintenance cost higher shortcomings. 

   In our country present stage compared with R134a  refrigerant R22 still possesses the advantages of high efficiency, stability, cheap, in the aspect of the application of large refrigeration unit will also be in a dominant position, in an ideal refrigerant before birth, R22 refrigerant can also be consumption by 2040.