Study On Algorithm Design Of Dynamic Louver Shading Board For Glass Curtain Wall Buildings

With the rise of glass curtain wall buildings trend,the high energy consumption and light pollution of glass curtain wall buildings have also attracted people's attention.The dynamic louver shading board plays an important role in improving indoor comfort of glass curtain wall buildings,reducing building energy consumption and increasing the effect of building energy saving.Therefore,the horizontal and vertical louver shading boards are selected as the research objects in this thesis.Taking Chengdu as an example,the algorithm design of dynamic louver shading board for glass curtain wall buildings is studied.By analyzing the geographical and climate characteristics,especially the distribution of solar radiation,sunshine,temperature and humidity in Chengdu area,the shading date is determined in Chengdu area.Then,the solar altitude angle and azimuth angle in the shading date are calculated and analyzed,and the suitable shading ways for different orientations of the building in Chengdu area are obtained:the south and the north are suitable for horizontal and vertical fixed external shading,and the east and west are suitable for adjustable external shading.Therefore,this thesis studies the algorithm design of dynamic louver shading board in the east and west directions of the building.The vertical shadow angle(?=tan^-1?tan h?cos?)is used as the judgment basis for the horizontal louver shading board turning.The width of the shading board is equal to the blade spacing of the shading board as the design condition.And the calculation formulas of the turning angle of the horizontal louver shading board during the cooling and heating periods are obtained:?=90-2×?and?=?.During the cooling period,when the vertical shadow angle is increased,It is designed directly according to the calculation formula of the turning angle;When the vertical shadow angle is reduced,the design method of advance time turning is adopted.During the heating period,the design methods of the middle point and the middle point angle turning are adopted.Taking an hour as the time interval,the turning angle of the building's eastern and western horizontal louver shading boards in different dates and different time nodes are obtained;Taking 20 degrees as the angle interval,the turning time of the building's eastern and western horizontal louver shading boards in different dates and different angle nodes are obtained.Unlike horizontal louver shading board,the horizontal shadow angle?r=A-?is used as the judgment basis for the vertical louver shading board turning.The width of the shading board is equal to the blade spacing of the shading board as the design condition.And the calculation formula of the turning angle of the vertical louver shading board during the cooling period is obtained:?=90+2×r;The calculation formula of the turning angle of the vertical louver shading board during the heating period is obtained:r?0,?=r;r<0,r=180+r.During the cooling period,when the horizontal shadow angle is morn than or equal to0,It is designed directly according to the calculation formula of the turning angle;When the horizontal shadow angle is less than 0,the design method of advance time turning is adopted.During the heating period,the design methods of the middle point and the middle point angle turning are adopted.Taking an hour as the time interval,the turning angle of the building's eastern and western vertical louver shading boards in different dates and different time nodes are obtained;Taking 20 degrees as the angle interval,the turning time of the building's eastern and western vertical louver shading boards in different dates and different angle nodes are obtained.By analyzing and summarizing the algorithm design process of dynamic louver shading board for glass curtain wall buildings in Chengdu area,the algorithm design idea and the intelligent operation principle of dynamic louver shading board are obtained.