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① The historical change of refrigerant
In 1989, the Montreal Protocol, the first international agreement to limit the use of CFCS, was signed, accelerating the process of protecting ozone from chemical destruction. At that time, R22 was the preferred substitute, and most commercial air conditioners and other electrical appliances are still in use today. However, the massive consumption of R22 will bring another catastrophic damage to the earth -- the greenhouse gas effect, so it has also been banned: in 2003, it was reduced to 65%, in 2010 to 35%, in 2015 to 10%, and in 2020 to completely ban (after adjusting to 2030)! And has been used to R134a, R407C, R410a and other new environmental refrigeration, and the first in the car air conditioning system to obtain mandatory use (EU regulations in 1996, China regulations in 2002). R410a with high pressure and high gas density is widely used. It can not only use compressors with smaller displacement capacity, but also pipelines and valves with smaller diameter. Therefore, it has become the best choice for commercial refrigerant in the world. The parallel flow micro-flow evaporator and condenser with high pressure resistance have become the best choice for home and commercial air conditioning systems.
② Vehicle air conditioning takes the lead in entering the era of microchannel
Micro-channel heat exchanger (commonly known as parallel flow evaporator and condenser) was first developed by two professors of Stanford University in 1981. In 1996, it began to be mandatory used in automobile air conditioning system with R134a as refrigerant. At present, all automobile air conditioning systems in the world use this kind of micro-channel heat exchanger.
③ Household and commercial air conditioners are ready to launch
The application of microchannel heat exchangers in domestic and commercial air conditioning systems was much later. First, the Japanese market, where R410a is the fastest market, has started to use small air conditioners with less than two units, and is gradually moving into large air conditioners. Meanwhile, it will expand the heat exchange area of air conditioners to increase the energy efficiency ratio to achieve high efficiency. And the preferred component to expand the heat exchange area of air conditioning is undoubtedly all aluminum microchannel heat exchanger.
As the ban period is approaching, more and more well-known air conditioning enterprises at home and abroad have begun to develop and use all aluminum micro-channel heat exchanger. As early as nine years ago, the United States began to use all-aluminum micro-channel heat exchangers on home air conditioners. The aircraft carrier "York" of the United States air conditioning industry has 100% used all-aluminum micro-channel heat exchangers on its products. Air conditioning manufacturers in Japan and South Korea, such as Sharp, Samsung, etc., started the research of micro-channel heat exchanger several years ago.
In China, it is more urgent to accelerate the upgrading of home and commercial air conditioners:
First of all, China's air conditioning output has been the world's largest for many years, and in recent years it has accounted for more than 70 percent of the world's annual air conditioning output. China bears the brunt of restrictions and bans.
Secondly, China's home and commercial air conditioning market competition is extremely fierce, coupled with the high price of copper makes it difficult for enterprises to bear, forcing enterprises to accelerate the pace of "aluminum instead of copper" and the application of new technology, that is, to meet the environmental protection, efficiency, energy saving, and at the same time to greatly reduce the cost, and the same volume of aluminum price is only one twelfth of the price of copper. The application of parallel flow technology has become the main direction of cost reduction.
Third, the state has introduced a series of mandatory energy-saving policies, laws and regulations and industrial standards. And air conditioning to achieve energy saving there are three main: one is to use frequency conversion control, but the frequency converter will increase a lot of costs; The second is to replace the refrigerant directly with R410a refrigerant on the copper tube heat exchanger, but it will lead to higher cost. Third, the use of parallel flow micro-channel heat exchanger, not only in line with environmental protection, effective energy saving, and can reduce the cost of more than 50%. Therefore, microchannel has become the best choice and outlet for home and commercial air conditioning upgrading.