Several kinds of HFCS refrigerant R22 alternative

refrigerant R22 is widely used in refrigeration and air conditioning industry, the refrigerant since since its launch in 1936, with its superior comprehensive performance across the entire refrigeration industry, and in the design, manufacture, operation and maintenance has accumulated rich experience in success.

however, due to the effect of loss of the R22 to the ozone layer and higher values of the greenhouse effect, 1992 Copenhagen international conference will be included in the scope gradually disable, 1995 Vienna international conference on the provisions of the schedule of disabled for, according to the performance requirements, our country should be in July 1, 1999 the CFC class material consumption of frozen in 1995 to 1997, on average, to a 50% cut in 2005, 2010.

refrigeration express the reporter understands, at present, countries around the world compete to carried out the study of HCFC22 alternative technology. After several years of experiment and evaluation, R22 more mature HFCS substitutes has the following several kinds:

a, 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. The alternative is simple, original R22 machine after using 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 the refrigerating capacity of the machine after using R407c and eer than a slight decline when using R22, R407c big defects may be large temperature glide. According to new data prediction, R407c in low refrigerating capacity range ( 5 - 20千瓦) Household air conditioner and high except screw compressor refrigerating capacity range ( 20 - 350千瓦) Positive displacement compressor of chiller is very promising.

2, R32/134 a: the non azeotropic mixture has good thermodynamic performance on 30/70%. Many reports pointed 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 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: 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 after proper pressure range optimization Canon than higher eer R22, under the same cost overall efficiency can be improved about 5%, enough to make up for the retrofit design of the required fees. So it can be used as a substitute for a long time, R22 in ordinary air conditioning unit or air-cooled, water-cooled integral chiller ( Except for the large capacity) And larger residential air conditioning cooling capacity have broad application prospects.

4, everything: 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.

5 and R1270: by R1270 and thermal physical properties and thermodynamic cycle of R22, hydrocarbon R1270 environment to accept performance is good, the main thermal physical properties similar to R22, the gasification of latent heat are higher than that of R22 and R290, high heat transfer efficiency, and R1270 flammable explosive sex can also through the production process and the improvement of the safety measures and overcome in refrigeration equipment. Lubricating oil with R22 system and other parts are compatible, and differ with R22 refrigerating capacity volume is not large, do not need compressor retrofit. High capacity, high coefficient of performance, filling quantity greatly reduced, the advantages of overall consideration is a kind of excellent performance of refrigerants.

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