At present, all countries in the world in phasing out traditional refrigerants such as R22
, advocate using environmental protection refrigerants.
Competing has carried out the study of R22 refrigerant alternative technologies.
After several years of experiment and evaluation, R22 refrigerant alternatives more mature has the following several: a, refrigerant R407c: is numerous calls for higher R22 alternative candidate alternative refrigerants.
This is because the R407c thermodynamic properties and R22 is similar, their work pressure and refrigerating capacity are close to.
Which alternative is simple, the original R22 machine after using refrigerant R407c except oil change, adjust the volume of injection system impact and throttling element, the compressor and the rest of the equipment are not change.
But after using R407c the refrigerating capacity of the machine and a slight decline than when using R22, what effect the refrigerant R407c great defects may be large temperature glide.
2, 134 - a refrigerant, the non azeotropic mixture in 30/70% has the very good thermodynamic performance.
Many report points out that the volume of injection system to rush, to optimize the heat exchanger after the air conditioning refrigerating capacity after the equipment adopts the mixed working medium completely with R22, and also what effect can raise a few percentage points.
Its disadvantage is that under certain conditions the flammability, though it is under normal working conditions is not flammable.
Three, R410a refrigerant: its thermal performance is very close to the single working medium, although it is similar to the thermal properties of R22 are not very, but it may be a promising HFC class R22 alternative.
Using R410a refrigeration system need to retrofit, but after retrofit machines become more compact.
Another advantage is its high thermal conductivity of liquid phase, low viscosity, make its have is better than that of the transmission properties of R22.
R410a refrigerant in the proper pressure range of Canon of optimization has higher than that of R22, what under the cost of the same overall efficiency can be improved about 5%, enough to make up for the retrofit design of the required fees.
Four, R134a has a refrigerant: compared with R22, pressure, will reduce the cooling capacity, most of the pipeline, including heat exchanger should be expanded to reduce the pressure loss, compressor capacity will increase.
The refrigerating capacity of the system after using it instead of R22 has reduced greatly, can effect comparing also fell slightly.
System retrofit cost is higher, so for small residential or commercial air conditioning is unlikely to use it, but for the big water chiller especially when using a screw or centrifugal compressor is more appropriate.
Overall, the research and development of alternative refrigerants are not just as simple and trial-produce, also need to invest a lot of manpower material resources, experience a long period to complete, so consumers will also be used as refrigerant R22 a period of time, will be eliminated by the new environmental protection refrigerant.
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