发布日期:2016/2/19 9:09:09
Building energy efficiency performance requirements for glass

  With a higher level of social and economic development, building energy consumption in total energy consumption in society a growing proportion of the current Western countries is about 30% to 45%, although China's economic development level and living standards are not high , but this proportion has reached 20% to 25% is gradually increased to 30%. In some cities, the summer air conditioning has become a major part of the electricity peak load.

Regardless of Western countries, is China, building energy situation is a big problem affecting the overall socio-economic development. Established in 1986, according to China's building energy-efficient three-step plan, the current government energy management departments at all levels are actively start the third step to achieve the target of 65% energy saving standard preparation. The impact of building energy consumption in the doors and windows, walls, roofs, floors four envelope components, the worst performance of thermal insulation of windows and doors, is one of the main factors affecting the quality of indoor thermal environment and energy efficiency in buildings.

Our current typical envelope components, the doors and windows energy consumption accounts for about 40% to 50% of the total energy consumption of the building envelope components. According to statistics, in the conditions of heating or air conditioning, heat and winter single glass window for the loss of about 30% to 50% of the heat load in summer due to solar radiation incident on the indoor heat through the glass window and a single cold consuming about 20% to 30% of the air conditioning load. Thus, enhanced thermal insulation properties of windows, doors and windows to reduce energy consumption, improve indoor thermal environment to improve building energy efficiency and quality level of an important link.

IG has outstanding thermal insulation properties, it is to improve the energy efficiency of windows important material in recent years has been very widely used in the construction. But with the continuous improvement of energy efficiency standards, ordinary insulating glass can not fully meet the technical requirements of energy-saving design. For example, in energy-saving design standard hot summer and cold winter area, the outer windows large window wall heat transfer coefficient than the limit indicators to 2.5W / m 2K, cold regions this indicator in the lower part of the conditions to 2.0W / m 2K.

Therefore, low-emissivity (Low -E) in the composition of the insulating glass monolithic glass, following the float glass, heat-absorbing glass, heat-reflective glass, coated glass began to spread the use of its excellent thermal insulation properties and non-reflective light pollution environmental performance in the market has been rapid development, building energy conservation areas provide an ideal energy-saving building materials.

LO W -E The spelling is LO WE m issivity, translated into Chinese is the meaning of low emissivity. It is in the glass surface of the multilayer coated metal or other compounds composed of film-based products. Low -E glass has two significant characteristics, namely low surface emissivity, the second is extremely high far-infrared (heat radiation) reflectivity. It can form a barrier to the heat radiation from the outer membrane facing the glass after endothermic heating, but also directly reflect the far infrared radiation.

Barrier effect of the above two properties LO W -E hollow glass film to convection heat conduction mate, it constitutes a very low U-value LO W -E insulating glass. It can block heat transfer from the hot end to the cold end. That winter the indoor heat barrier spilled to the outside, summer outdoor thermal radiation barrier into the room, so as to achieve energy-saving purposes.

                                                                                                    Shandong Weihua Glass Co., Ltd