Requirements for glass performance of the hottest

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Requirements of building energy conservation on glass performance

with the improvement of social and economic development, building energy consumption accounts for an increasing proportion of total social energy consumption. At present, the proportion of building energy consumption in western developed countries is about 30% - 45%. Although China's economic development is also one of the countries with the largest import of plastics and waste plastics, and the standard of living is not high, this proportion has also reached 20% - 25%, and is gradually rising to 30%. In some big cities, air conditioning has become the main component of peak load in summer

whether in western developed countries or in China, building energy consumption is a major problem affecting the overall social and economic development. According to the three-step plan for building energy conservation formulated in 1986, energy conservation management departments at all levels of the government are actively starting the preparation of standards to achieve the goal of 65% energy conservation in the third step. Among the four envelope components of doors and windows, walls, roofs and floors that affect building energy consumption, the thermal insulation performance of doors and windows is the worst, which is one of the main factors affecting indoor thermal environment quality and building energy conservation

as for the typical enclosure components in China at present, the energy consumption of doors and windows accounts for about 40% - 50% of the total energy consumption of building enclosure components. According to statistics, under the condition of heating or air conditioning, the heat loss of single glass windows accounts for about 30% - 50% of the heating load in winter, and the cooling capacity consumed in summer due to the warming of the solar radiant heat through the international market situation of single glass windows into the room accounts for about 20% - 30% of the air conditioning load. Therefore, enhancing the thermal insulation performance of doors and windows and reducing the energy consumption of doors and windows are important links to improve the quality of indoor thermal environment and improve the level of building energy conservation

insulating glass has outstanding thermal insulation performance. It is an important material to improve the energy-saving level of doors and windows. In recent years, it has been widely used in buildings. However, with the continuous improvement of energy-saving standards, ordinary insulating glass can not fully meet the technical requirements of energy-saving design. For example, in the energy-saving design standard in hot summer and cold winter areas, the heat transfer coefficient of the outer window with large window to wall ratio is limited to 2. 5w/m2k, the index of cold areas reached 2 under some conditions. 0W/m2K。

therefore, the Low-E coated glass, which is widely used in the single-chip glass that constitutes insulating glass, after float glass, heat absorbing glass and heat reflecting glass, has developed rapidly in the market with its excellent thermal insulation performance and environmental protection performance without reflected light pollution in several 10 factories in eight countries, providing an ideal energy-saving building material product for the field of building energy conservation

The complete spelling of Low-E is lowemissivity, which means low radiation in Chinese. It is a film product composed of multilayer metals or other compounds on the surface of glass. Low-E glass has two remarkable characteristics, one is extremely low surface emissivity, and the other is extremely high far-infrared (thermal radiation) reflectance. It can not only prevent the glass from absorbing heat and heating up, but also directly reflect far-infrared thermal radiation from the film in the form of radiation

the above two characteristics of Low-E membrane are combined with the barrier effect of insulating glass on heat convection and conduction to form Low-E insulating glass with extremely low U value. It can block the transfer of heat from the hot end to the cold end. That is, prevent the indoor heat from pouring out to the outside in winter and prevent the outdoor heat radiation from entering the room in summer, so as to achieve the purpose of energy saving

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