China will become an important production base of

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China will become an important production base of energy-saving glass. As an important building energy-saving material, energy-saving glass is playing an increasingly important role in promoting building energy conservation in China. Focusing on the current situation and development trend of energy-saving glass in China, experts and scholars at the "2007 China Glass Industry Annual Conference and technical seminar" hosted by China architectural glass and Industrial Glass Association listened to the discussion on the topic of building energy-saving and energy-saving glass. Long Wenzhi, head of the expert group of the Technical Committee for standardization of curtain wall doors and windows of the Ministry of construction, Shi Xinyong, Wu Jie, Han song, Liu Haibo of China building materials inspection and Certification Center, Li Wei of Luobo group, Tong Dewei of Qinhuangdao Yaohua Glass Co., Ltd. and other experts and scholars have expressed many valuable views

the situation of energy conservation in China is grim, and building energy conservation is urgent. Long Wenzhi, an expert, said that the current energy-saving situation in China is grim. According to the data of the National Bureau of statistics, in 2006, the energy consumption per unit of GDP decreased in 29 regions in 30 provinces and cities (excluding Tibet), of which about 17 regions decreased by more than 3%, 6 regions decreased by 2% to 3%, and 6 regions decreased by 1% to 2%. However, in addition to Beijing, other regions in the country have not completed the target task of reducing the energy consumption per unit of GDP in 2006 due to the advantages of flame retardant PP in easy processing and low price. According to the 11th five year plan approved by the National People's Congress last year, by 2010, the national energy consumption per 10000 yuan of GDP will drop from 1.22 tons of standard coal in 2005 to less than 1 ton of standard coal, a decrease of about 20%. This means that from 2006 to 2010, the average annual reduction rate of energy consumption per unit of GDP should be 4%. If the target of 4% is not achieved in the leading year, it will accumulate greater pressure for the next four years

according to the requirements of the Ministry of construction, green energy-saving buildings will become the mainstream of domestic buildings in the future, and the Ministry of construction will promote energy-saving buildings by implementing energy-saving logo certification and corresponding tax preferential policies. Therefore, whether the new buildings and existing buildings can save energy at present is not only related to whether the tension between China's energy supply and demand can be alleviated, but also related to the realization of the goal of energy conservation and consumption reduction in the eleventh five year plan. As the three major areas of energy consumption, energy conservation and consumption reduction in the construction industry is urgent

China must follow its own path of energy conservation. If all mankind consumes energy according to today's European lifestyle, we need three earths; According to the American way of life, five earths are needed; If you follow the lifestyle of Dubai, you need ten earths. With the rapid economic development of developing countries such as China and India, the global climate and environment situation will become more and more serious. International agencies predict that China may overtake the United States as the world's leading energy consumer as early as 2008. Therefore, China must follow its own path of energy conservation

the first thing to do well in building energy conservation is to save energy in curtain walls, doors and windows. Building energy conservation is a complex system engineering, including exterior wall subsystem, roof subsystem, ground subsystem, heating and refrigeration subsystem, health ventilation subsystem and curtain wall doors and windows (mainly doors and windows) subsystem, of which the external subsystem of curtain wall is the most closely related to building energy conservation, which should attract our great attention. The phenomenon of hot summer and cold winter in most cities in China is very prominent. The energy-saving of curtain wall doors and windows must not blindly apply the model of foreign cold areas

the building energy consumption in China accounts for more than a quarter of the total energy consumption, and the energy consumption of building doors and windows is about half of the building energy consumption. Since China has not paid much attention to the energy conservation of doors and windows for a long time, more than 95% of buildings with an area of more than 40 billion M2 now use non energy-saving window frames and glass, and the same is true of buildings with an annual increase of more than 2 billion m2. The vast majority of billions of square meters of public buildings and tens of millions of square meters of glass curtain walls also use non energy-saving monolithic glass or ordinary insulating glass

curtain walls and windows are the "eyes" of buildings. Curtain wall windows account for about half of the energy consumption of the whole building. 80% of the energy consumption of curtain wall doors and windows is borne by the glass of curtain wall doors and windows, while the energy consumption per unit area of curtain wall windows in China is 2-3 times that of developed countries. Therefore, building energy conservation should first pay attention to the energy conservation of curtain wall doors and windows glass. Curtain wall doors and windows (especially external windows) glass is one of the keys to building energy conservation

China's energy-saving glass market has large capacity and rapid development. Market demand for energy-saving glass. The results of preliminary statistics show that the output of glass curtain walls in China in 2005 was about 17million m2, and the output of glass for external doors and windows was about 300million m2. This scale will be maintained in the next 15 years. If the energy-saving requirements are met by 70%, it can be estimated that the average annual market demand for energy-saving glass is 220million m2 The energy-saving glass used in curtain wall doors and windows in China is undergoing a development process from ordinary white glass to darker color heat absorbing glass (commonly known as brown glass), to light green heat absorbing glass and coated glass to hollow glass, and then to Low-E glass to vacuum glass. However, China's geography and climate are complex, and it is impossible to cut across different climatic zones across the country, so there will be a market situation in which a variety of energy-saving glasses will be used together geographically. Some experts also believe that the key to building energy conservation is the outer wall glass of the building. In the building energy consumption, the energy consumed by the heat exchange between the outer protective structure of the building and the outdoor environment accounts for a large share. The huge amount of coal consumption used for heating in winter in the cold regions of northern China, and the power consumption of air conditioning in summer in southern China and even the whole country in summer are mostly caused by the heat exchange between the enclosure and the external environment. Therefore, the focus of building energy conservation is to improve the thermal performance of the envelope, reduce the heat transfer coefficient and reduce the heat loss. Especially when the energy-saving potential of heating, ventilation and air conditioning technology is close to the limit, the realization of the goal of building energy conservation will increasingly rely on the improvement of the thermal performance of the outer envelope

China is forming an important production base of energy-saving glass. Since the 1960s, more than 200 insulating glass production lines have been established in China, including more than 70 foreign production lines. In terms of the domestic market, the production and demand of insulating glass are increasing year by year. It was 700000 m2 in 1995, 5million m2 in 1999, 45million m2 in 2005 and 70million W-E glass in 2006. It was introduced into the Chinese market in 2001. At present, it is in the ascendant in the Chinese market. It is the energy-saving glass with the fastest market demand growth in recent years. The consumption in 2005 was about 5million m2, and that in 2006 was about 10million m2. It is expected that the demand will reach more than 50million M2 by 2010. In recent years, high-grade energy-saving glass is mainly used in public buildings and high-rise buildings, but in recent years, the residential energy-saving glass market in some economically developed areas has also begun to heat up rapidly. According to the Ministry of construction, during the "Eleventh Five Year Plan", China will add 2.1 billion m2 of new buildings, transform 3.8 billion m2 of old buildings, and the total consumption of energy-saving consumables will exceed 4trillion yuan. According to the budget made by the Ministry of construction for the domestic energy-saving market, the national expenditure on energy-saving subsidies and conventional consumption, as well as the purchase of energy-saving products, will reach as high as 5trillion yuan in the next decade, even if 5% of them use building energy-saving glass and doors and windows, it will reach 250billion yuan

large glass enterprises at home and abroad have set their sights on China's energy-saving glass market and showed the corresponding experimental results. At present, high-grade energy-saving glass such as Low-E is mainly produced by Xinyi, yaopi, CSG, grant, Bluestar, Qinhuangdao and other large glass manufacturers along the EPS external insulation market represented by South Korea in Europe, Germany and Asia. However, the trend of inward migration of coastal products is becoming increasingly obvious, and the nationalization and comprehensiveness of the high-end energy-saving glass market have begun to take shape. In view of the expanding market of China's energy-saving glass industry, international manufacturers such as Saint Gobain of France, Tim bavaronne of Finland and Asahi of Japan have entered China one after another, investing in the establishment of offline coated glass, low radiation coated glass, strong convection tempering furnace and other production lines. Although the development of large international glass companies in China has further intensified the competition in China's energy-saving glass industry, it will promote the promotion and application of energy-saving technologies in the whole glass industry and the development of building energy conservation

the promotion and application of energy-saving glass urgently needs the protection of laws and policies. China's policies, regulations and regulatory measures for building energy efficiency, as well as the R & D and industrialization of building energy-saving products, have lagged behind developed countries for at least more than ten years. Take the energy conservation of doors and windows as an example. Since the 1970s, energy conservation of doors and windows has attracted the attention of Western society. The glass window is the "opening" of the building envelope, and its design purpose is to achieve the basic attribute of the window, such as light transmission, viewing, ventilation, etc., that is, functionality. The "energy crisis" caused by the Middle East war in 1973 caused the western world to have a sense of crisis about energy, and thus began to intensify the research on building energy conservation. After years of research, it has been found that in western buildings, windows are the weak link of thermal insulation compared with walls, and the energy lost through windows is extremely considerable. The Research Report of American experts pointed out that at that time, the energy loss of building windows in the United States due to poor thermal insulation performance accounted for about 3% of the total energy consumption in the United States, while the Swedish research results showed that this proportion was as high as 7% Driven by these studies, western countries continue to issue strict building energy-saving laws and regulations, and make clear provisions on the energy-saving indicators of windows according to their own climate and building characteristics. Moreover, these laws and regulations have been continuously revised and the indicators have been continuously improved for decades, and the energy-saving of windows, that is, glass, has been paid more and more attention. In more than 30 years since the 1970s, breakthroughs have been made in new technologies and products of energy-saving glass. At present, in western developed countries, Low-E insulating glass has become the mainstream product of "energy-saving window glass"

The popularization and application of energy-saving glass will produce huge economic and social benefits. According to the report of the European flat glass association in 2005: in 1991, after European countries announced that Low-E insulating glass was forcibly adopted in 1995, the market share of Low-E insulating glass rose sharply, exceeding 50% in 1995 and approaching 100% in 1998. The usage increased from less than 2million m2 at the beginning to 36million m2 in 2004 By 2009, the consumption of Low-E glass in Western Europe will reach 120million m2. In 2004, the production capacity of Low-E insulating glass in the United States will be 60million m2 The energy-saving effect of Low-E insulating glass is very obvious. A low-E glass coating production line worth US $8million with a service life of ten years can produce at least 3.7 million m2 of residential glass every year. The energy saved by these glasses in the first ten years alone is equivalent to 36million barrels of oil (compared with the energy saving rate of ordinary insulating glass). To produce these oil, it needs to invest US $300million to build an offshore oil production platform with a service life of more than ten years. The environmental protection effect of Low-E insulating glass is more obvious. The flat glass industry in the 25 member states of the European Union emits about 4.6 million tons of carbon dioxide every year, while the greenhouse gas emissions caused by building energy consumption are 765 million tons every year. If all buildings use Low-E insulating glass, the carbon dioxide emissions can be reduced by 1.4T every year, reducing 18.3% As the original piece of energy-saving glass, the output of Low-E glass in China was about 5.9 million m2 in 2005 and 9.2 million m2 in 2006, less than one sixth of the annual output of the United States in 2004. Therefore, there is still a big gap between China and developed countries in the promotion and application of energy-saving glass

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