Research On The Optimization Of Thelouver Sunshade Of The Exterior Wall In Hefei Area

With the development of the economy,the situation of energy supply in our country is becoming more and more seriously.In recent years,rapid development of the national construction industry makes the building energy consumption gradually prominently.Globally,the building energy consumption accounts for the primary energy consumption of 20%-40%.even as high as 45% in some developed areas.Therefore,building energy efficiency has become the current focus.In order to alleviate the energy crisis,the corresponding measures should be taken to reduce building energy consumption,Simultaneously,building shade is provided with highly efficient energy-saving potential,therefore,all kinds of shading forms are the key to the building energy saving.This paper put forward reasonable model of sunshade in Hefei area,and studied the optimization of the blind angle by theory and simulation.Firstly,the paper used Designbuilder software to study the variation of solar azimuth and altitude in Hefei area;The annual variation of the solar radiation intensity and its contribution to the building heat were analyzed by using the data of Chinese special meteorological data.The surface temperature variation of the outer wall was simulated through the software simulation of the typical office building in summer.and the temperatures of the west wall and the east wall are generally higher in the extreme weather.By comparing the measured data with the simulation results,and combining with the high temperature of west wall,the phenomenon of overheating in the west room was analyzed.Secondly,the paper put forward that south wall adopt horizontal shading,meanwhile,the external wall of the east and west wall adopt the vertical angle of blind sunshade,supplemented by horizontal shading pattern.Various factors affecting the comprehensive shading were analyzed by theoretical approach.By analyzing the numerical relationship between the solar azimuth with the height angle and the sun shading,the general formula of the vertical dig angle of the blind was obtained,the paper put forward several patterns of vertical blind shading,and get a better shade pattern by analyzing the different patterns of the summer sun shading and winter sunshine effects,and proved the reasonable width of the horizontal shading in theory.Finally,the paper used Energy-Plus to simulate the air conditioning energyconsumption of typical office building room.With the minimum air conditioning energy consumption as the control index,the best blind angle of the best sun shading pattern was obtained,the paper verified the accuracy of the theoretical results of horizontal plate width and analyzed the energy saving effect of air conditioning system when building adopted comprehensive shading pattern.