The building in the winter from the window disappearing quantity of heat is very big.According to American statistics, building through window disappearing energy composition building expended energy 30%.The proportion occupies which in Sweden is bigger, approximately 70%.Our country statistical data indicated approximately composes 50%.The domestic and foreign practices proved that, enhances the building surrounding protection structure the heat preservation performance, specially enhances the window the heat preservation performance is prevents building quantity of heat disappearing economically, the most effective method.Spatial glass in construction application key function.According to the American material reported that, the high-level office building uses in the silver-gray color spatial glass window each square foot every year to heat the energy consumption is 5494KJ, the ratio uses the single-layer glass window energy conservation 2/3 (single-layer glass window each square foot every year to heat energy consumption is approximately 17775KJ).
Along with our country national economy development, the country to question requests and so on environmental protection, energy conservation, improvement housing conditions is more and more high, has formulated one batch of technical laws and regulations correspondingly.In 1995 revised "Civil construction Energy conservation Design standard" <JGJ26095> (to hereafter refer to as new standard) to request the building to heat the energy consumption to reduce 50% compared to the 80's standards (building to undertake 30%, heating system undertakes 20%), encircled to the building expands the structural material and the windows and doors heat transfer coefficient set the new request.The single-layer glass window heat transfer coefficient is 6W/m2.K Shan Kuangshuang the Bolivia steel models the compound window the heat transfer coefficient is 3.5W/m2.K, Shan Kuangshuang the Bolivia plastic window heat transfer coefficient is 2.6 W/m2.K.The window heat transfer coefficient must achieve below 2.5 W/m2.K must use the spatial glass.
According to the new standard, places such as Beijing, Tianjin, Shenyang, Dalian use double Bolivia to be able to satisfy the request.But double Bolivia easy to have the condensation question, when specially double Bolivia seals not not strictly, the dead level glass internal surface easy knot fog to affect the operational performance.Therefore, substitutes for the double Bolivian window with the spatial glass is the inevitably trend of development.
Although our country new standard had the very big enhancement to the window heat transfer coefficient request compared to the original standard, but with overseas compares also has certain disparity.
At present in our country architecture industry use the spatial glass main question constructs the construction cost increase.The construction construction cost increase may take back very quickly from the energy conservation.The plan department does in the building use the spatial glass technical economy computed result indicated, in our country cold area (northeast, Inner Mongolia) uses the energy conservation effect which the spatial glass obtains, may compensate the construction construction cost in 4-5 year which increases.