Analyzes Of Architectural Energy Consumption And Optimizing Selection Of Shading Product In Beijing District

The average summer temperature of Beijing reaches 30.2 degree. Spot check shows that the ratio of electricity usage of the marketplace, office building and lofty groggery is 50%, 37%, 43% respectively; the air condition quantity of 100 civil constructions have changed from 35.8 in 2001 to 87.8 in 2006, the air condition is the second largest energy consumption in construction, building shade is the effective to save the energy consumption of air condition and improve indoor comfort. This paper studies how to select the appropriate way and products of shade, and how to coordinate the sun heat in winter and sun-shading in summer to optimize the overall energy saving effect, thus provide the basis for application of shading product in Beijing.The paper uses public building and residential construction as objects, and glass shade and external shade as the two main ways. The evaluation method is comprehensive energy saving rate of sun light gain in winter and sun-shading in summer. We analyze the influence law of different orientation and different shading coefficient on comprehensive energy saving rate by the energy consumption simulation software DeST. By that, we optimize the choice of glass shade and external shade products and product performance design.The analysis of normal hollow glass, hollow glass with low sunlight permeation, hollow glass with high sunlight permeation, composite vacuum glass with low sunlight permeation and composite vacuum glass with high sunlight permeation shows that optimized combination of glass types of the residential construction is glass with high sunlight permeation in south and north and glass with low sunlight permeation in east and west, Comparing to the normal hollow glass in all orientations, the optimized combination of hollow glass types reaches comprehensive energy saving rate to 4.0%, and the optimized combination of composite vacuum glass types can reach the highest comprehensive energy saving rate to 8.5%; optimized combination of glass types of the public building whose area ratio of window to wall is 0.7 is glass with low sunlight permeation in south, east and west, and glass with high sunlight permeation in north, the optimized combination of hollow glass types reaches comprehensive energy saving rate to 24.9%, and the optimized combination of composite vacuum glass types can reach the highest comprehensive energy saving rate to 31.2%.The analysis of external shade shows that as each orientation's sunshading coefficient of the residential construction reduces from 0.8 to 0.3, comprehensive energy saving rate of active shade in south improves obviously and reaches 5.8%. But sunshading effect of the east and west is not obvious, mainly because its smaller area. In other aspect, the living condition has greatly improved. The choice of active shade in Beijing can reach better effect, and shutter shade, fabric shade, sun blinds shade are better products of shade.As the sunshading coefficient of the public building reduces from 0.7 to 0.2, the total energy consumption of the south, north, east and west decreases by 9%, 5%, 8%, 7%, the comprehensive energy saving rate of active shade is much higher than fixed shade, it is 16%, 7%, 12%, 11% of south, north east and west separately. As the public buildings are mostly high-rise building, aluminum wing shade and aluminum grille shade with strong wind resistance performance become the fist choice for large public buildings. At the same time, the simulation of the level wing shading in the office building shows that the appropriate width of the panel of south is 255 millimeter, and that of north is 155 millimeter. From the comprehensive energy saving rate of each orientations, the effect of shade is obvious in south, north to the second, but it is not good in east and west. The active shade is the recommend way.