The hottest glass curtain wall and door and window

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Abstract: starting from the energy-saving situation of glass curtain walls and doors and windows, this paper systematically expounds the expectations and calls for the innovation and development of energy-saving glass

key words: tunnel strategy, energy-saving life, performance integration, hollow Low-E glass, multi-color Low-E glass, vacuum glass, energy-saving laminated glass, photoelectric laminated glass

1 the energy conservation situation is grim

according to the data of the National Bureau of statistics, in 2007, the energy consumption per unit of GDP decreased in 29 regions in 30 provinces, autonomous regions and municipalities directly under the central government (excluding Tibet). Among them, there are 17 regions with a decrease of more than 3%, 6 regions with a decrease of 2% to 3%, and 6 regions with a decrease of 1% to 2%. However, with the exception of Beijing, other regions in the country have not completed the target task of reducing the energy consumption per unit of GDP in 2006

according to the "Eleventh Five Year Plan" passed 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%. The leading year failed to achieve the target of 4%, which has accumulated greater pressure for the next four years. The situation of energy conservation is grim

2 building energy conservation is urgent

2。 The more developed the productivity is, the higher the people's living standard is, and the building energy consumption will increase year by year. At present, China's building energy consumption accounts for 27% of the total energy consumption. However, this proportion is increasing by one percentage point every year, and the proportion of building energy consumption will soon exceed that of the whole primary and secondary industries

distribution of energy consumption in China

transportation: 34%

industry: 35%

Construction: 28%

Others: 3%

building energy conservation and sustainable development of the construction industry are not only related to the quality of life of the people, but also related to the national economy and the people's livelihood

2。 China is in a period of rapid urbanization and industrialization, with an annual area of 2billion square meters, nearly half of the global total annual construction. By 2020, half of the existing buildings in our country will be built in the next 15 years, which is a historical opportunity. Whether China's new buildings and the existing 40billion square meters of existing buildings can save energy is not only related to whether China can alleviate energy tension, but also related to global climate change and sustainable development. It is also related to whether China can take the path of resource conservation and environmental friendliness, whether it can contribute to the sustainable development of the world, and whether it can improve the quality of life in the most economical way. It is related to the realization of the goal of energy conservation and consumption reduction in the "Eleventh Five Year Plan"

2。 "Although the energy consumption per unit of GDP slowed down for the first time in 2006, the rebound in energy consumption per unit of GDP in the first two months of this year shows that the situation of energy conservation and consumption reduction in China is still serious. As the construction industry in the three major energy consumption fields, energy conservation and consumption reduction cannot be slowed down at any time."

3 China's energy conservation is not "foolish men climbing the mountain", but "wise old men walking through the mountain"

if all mankind consumes resources according to today's European lifestyle, we need three earths; According to the American lifestyle, five earth resources are needed; If we follow the lifestyle of Dubai, we need the resources of 10 earths

with the rapid economic development of large developing countries such as China and India, the global climate and environment situation will become increasingly severe. International agencies predict that China may overtake the United States as the world's leading energy consumer as early as 2008. So which way does China take to save energy? The experience of energy conservation and consumption reduction in western countries shows that the energy consumption per unit of GDP relative to per capita GDP usually follows a bell curve as shown in the figure. This curve can be compared to a hill. In order to develop the economy and improve the income level, a country must "climb the mountain". Developed countries are already at the downhill end behind the mountain, while most developing countries are still climbing hard at the uphill end. They are experiencing a more energy intensive development model, which can be compared to "foolish men climbing the mountain". The challenge facing China is to avoid this old path and not reduce energy consumption per unit of GDP until the economy has developed to a certain extent. The way to achieve this is to change the "foolish man climbing the mountain" to "wise old man walking through the mountain". This is equivalent to building a tunnel on the mountain of energy consumption per unit of GDP and directly leading to the other end of the slope. This is the "tunnel strategy" that China should adopt in the process of modernization

'wise old people walk through the mountains' lies in' wisdom ', that is, using technological progress to achieve energy conservation and consumption reduction. According to relevant data analysis, China's energy efficiency is 33%, 10 percentage points lower than the international advanced level, and the average unit energy consumption of major products is 40% higher than the international advanced level, while Shanxi Province is lower. Some data show that at present, the energy conservation achieved by adjusting the industry and product structure accounts for about 70% to 80% of the energy conservation potential of the industrial sector, and the energy conservation achieved by reducing the energy consumption per unit product based on technological progress accounts for 20% to 30%. Therefore, the potential of using technological progress to achieve energy conservation and consumption reduction is still considerable. Therefore, we should focus on the development of key energy-saving technologies

4 building energy conservation should focus on energy conservation of curtain wall, door and window glass

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 door and window (mainly outer window) subsystem. The key is that the outer window subsystem of curtain wall has a very close relationship with building energy conservation, which should be highly valued by our whole industry. The phenomenon of hot summer and cold winter is very prominent in most cities in China. The energy-saving of curtain wall doors and windows cannot blindly apply the schemes of foreign cold areas. Inviting foreign experts to design may not necessarily serve the local "water and soil"; Energy saving building is essentially a climate (or even geological) adaptive building, which must be aimed at and make use of the regional microclimate conditions; Pay close attention to the establishment of regional public database of building energy conservation; Carry out energy efficiency

pre evaluation and analysis of the "foreign" scheme and strictly review it

curtain wall windows are one of the openings of the peripheral structure of the building and the "eyes" of the building. 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 unit area of curtain wall windows in China can reach 2-3 times that of developed countries. Building energy conservation should be "wise old people walk through the mountain". We should first pay attention to the energy conservation of curtain wall doors and windows. Grasp the key faucet of curtain wall doors and windows (especially external windows) glass to make it truly meet the standard of energy conservation. We may not be "foolish men climbing the mountain" but "wise old men walking through the mountain"

5 market of energy-saving glass

it is estimated that the average annual market demand for energy-saving glass is about 22000 square meters

in terms of time coordinates, the energy-saving glass used for curtain wall doors and windows in China is undergoing a development process from ordinary white glass - darker color heat absorbing glass (commonly known as brown glass) - light green heat absorbing glass and coated glass with anchor screws - hollow glass - low glass - hollow low glass - vacuum glass. However, China's geography and climate are complex, and it is impossible to cut across different climatic divisions across the country. Therefore, from the regional coordinates, a variety of energy-saving glasses will be used at the same time. Since the 1960s, more than 200 production lines of hollow glass have been established in China, including 70 foreign production lines. From the perspective of the domestic market, the production and demand of insulating glass are increasing year by year. In 1995: 700000 square meters, in 1999: 5million square meters, in 2005: 45million square meters, in 2006: 70million square meters. In Europe, about 90% of buildings use coated insulating glass, while in China, less than 40% of buildings use coated insulating glass, and less than 10% of all insulating glass., Although the price of coated insulating glass is five times that of ordinary glass, it can enable users to obtain more energy-saving benefits. In the next five years, the market scale of domestic coated insulating glass is expected to expand by four times. Low-E glass was introduced in 2001 and is in the ascendant in China. It is the fastest growing energy-saving glass market in recent years. Its output was 3.5 million square meters in 2004 and 6 million square meters in 2005, with a growth rate of about 70%; In 2006, it was about 10million square meters, and it is expected to grow at a high rate of 50% in the future. It is estimated that the demand in 2010 will reach more than 50million square meters. In recent years, high-grade energy-saving glass has been mainly used in public buildings and high-rise buildings, but from the recent market, the market for energy-saving glass in civil housing is also heating up rapidly. Doors and windows of well-known buildings such as' Vanke 'and' China Resources' in Guangdong Province have begun to use energy-saving glass in a large number of civil housing. According to the Ministry of construction, during the 15 plan period, China will add 2.1 billion square meters of new buildings, renovate 3.8 billion square meters of old buildings, and the total consumption of energy-saving consumables will exceed 400 billion 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 500 billion yuan in the next 10 years. Even if 5% is used for building energy-saving glass, it will reach 250billion yuan

low-e and other high-end energy-saving glasses are currently mainly produced by large coastal glass enterprises such as Xinyi, yaopi, CSG, grant, Lanxing, Qinhuangdao, epithelial, etc., but 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 has begun to take shape

whoever attaches importance to today's Chinese environment will have tomorrow's market. 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 and invested in the establishment of production lines such as off line coated glass, low radiation coated glass and strong convection tempering furnace. Although the localization development behavior of multinational companies in China further intensifies the competition in China's energy-saving glass industry, it will promote the promotion and application of energy-saving technology in the whole glass industry and the development of building energy conservation

6 glass curtain walls need to be beautiful and energy-saving at the same time. The market of energy-saving glass curtain walls calls for rich colors, different optical parameters, and multiple types of Low-E glass

at present, the hue of Low-E glass curtain walls in China is affected by the hue of European Low-E glass curtain walls and constrained by the existing process and technology level, and they are basically gray and gray blue. Some cases are as follows:

6. 1 glass parameters: visible light transmittance 43%, reflectance 33%, reflection color blue gray, sc=0. 36,U=1。 79,

visible light transmittance 43%, reflectance 33%, reflectance blue gray, sc=0. 36,U=1。 79。

6。 2 glass parameters:

visible light transmittance 53%, reflectance 17%, reflection color light blue gray, sc=0. 46,U=1。 84。

visible light transmittance 53%, reflectance 17%, reflection color light blue gray, sc=0. 46,U=1。 84。

6。 3 glass parameters:

visible light transmittance 48%, reflectance 18%, reflection color light gray, sc=0. 42,U=1。 86。

6。 4. Glass parameters are:

visible light transmittance 36%, reflectance 29%, reflection color silver gray, sc=0. 30,U=1。 76。

6。 5 the technical parameters of glass are as follows:

visible light transmittance 74%, reflectance 12%, light blue gray,

sc=0. 65,U=1。 86。

6。 6. The technical parameters of glass are:

visible light transmittance is 65%, reflectance is 12%, light blue gray,

sc=0. 55,U=1。 84。

visible light transmittance is 65%, reflectance is 12%, light blue gray

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