Study Of Office Building Energy Efficiency By External Shading For Window In Tianjin

In china, building energy consumption is constantly growing with the development of economy, and building energy efficiency becomes a very important task. This dissertation points out that pulic buildings consume a great deal of energy, and chooses the office buildings which take a large propotion of public buildings as the main research objects in this article. Aircondition energy consumption takes a large extent to office buiding energy consumption, because there are many unsuitable sun-shading of building in the city which makes room hot for the greenhouse effect, which cost more and more air-condition energy. So, a good shading design is an effective way in building energy efficiency.Currently, the application and research of shading system of building is extensively paid attention to south china. Along with temperature rising in cold area, it is as hot as in south china, but it is advers for energy saving that we do not attach adequate importance to shading design in cold area. Shading design is correlative with regional and climatic characteristic. We should not onl take the shading into accout in summer, but also the obtaining solar radiation in winter.This thesis bases on the climatc characteristic of cold area where tianjin sits and study the shading theory, and works out the shading period, the shading time of different orientations. The shading type and shading angle also has been figured out by the graphic method. Utilizing design program energy plus and radiance, we analyze the effect of different shading types for energy efficiency and light in an office model created by the simulation program, the economy of shading products, and get a result of efficacy about different shading type which will be useful for architect to design a good shading system.