Natural environmentally friendly refrigerants are sought after

Starting from 2010, my country has fulfilled the task of accelerating the phase-out of HCFC in the Montreal Protocol. In 2013, the production and use of HCFC will be frozen at the average level of 2009 and 2010, and 10% will be phased out in 2015. The use of HCFC in new products will be completely stopped in 2030. At present, R22 refrigerant is widely used in the refrigeration industry. This refrigerant not only has a significant destructive effect on the ozone layer, but also has a significant greenhouse effect. According to regulations, the world will fully restrict the use of R22 in 2030. Finding an alternative working fluid for R22 has become the most urgent task of the refrigeration industry.

- According to the reporter’s understanding, starting from 2010, my country has fulfilled the task of accelerating the phase-out of HCFCs in the Montreal Protocol. In 2013, the production and use of HCFCs will be frozen between 2009 and 2010. On average, 10% of the consumption will be eliminated in 2015, and the use of HCFC in new products will be completely stopped in 2030. At present, R22 refrigerant is widely used in the refrigeration industry. This refrigerant not only has a significant destructive effect on the ozone layer, but also has a significant greenhouse effect. According to regulations, the world will fully restrict the use of R22 in 2030. Finding an alternative working fluid for R22 has become the most urgent task of the refrigeration industry.

It is reported that on July 14, 2011, the world's first hydrocarbon refrigerant R290 split air-conditioning demonstration production line was officially completed in Zhuhai Gree Electric Appliances, and successfully passed the on-site inspection and acceptance by the Sino-German joint expert group. Reaching the 'international leading' level, this marks the official mass production of the R290 refrigerant air conditioner that has attracted much attention from the industry.

When many domestic companies are developing new refrigerants, foreign companies led by compressor giant Danfoss have begun to promote CO2 refrigerants. In fact, CO2 refrigerants have been used many years ago, and they were ignored by the industry only when artificial synthetic agents appeared. When people started to look at refrigerants again, natural refrigerants once again attracted the attention of the industry.

It is understood that carbon dioxide has high density and low viscosity, its flow loss is small, and its heat transfer effect is good. By strengthening the heat transfer effect, it can make up for its shortcomings of low circulation. At the same time, carbon dioxide has excellent environmental performance, low cost, easy access, good stability, and is conducive to reducing the volume of the device. The most important thing is that it is safe, non-toxic and non-flammable, which has obvious advantages over R290.

Currently, the research and application of carbon dioxide are mainly concentrated in the following three aspects: On the one hand, in the field of automobile air-conditioning, due to the large amount of refrigerant emissions, it is also harmful to the environment. Refrigerant; The second aspect is the heat pump water heater. The carbon dioxide releases heat under supercritical conditions and there is a considerable temperature slip, which is conducive to heating the hot water to a higher temperature; the third aspect is considering the good low carbon dioxide , Temperature fluidity and heat exchange characteristics, it is used as a low-temperature refrigerant in a cascade refrigeration cycle.

Experts in the large air-conditioning and refrigeration market believe that with the elimination of HCFC refrigerants, as the air-conditioning industry, it is necessary to speed up the development of new environmentally friendly refrigerants, and natural refrigerants will receive more Sought after.

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