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ade still have dirt problem. Dirt accumulated inbetween the fa231。ade is hard to clean ? Interior recycling ventilated double fa231。BBRT 2022 05/31 建筑遮陽和日光照明 Building shading and daylighting control 許鵬 教授 博士 博導(dǎo) 機(jī)械工程學(xué)院 Peng Xu Professor, PhD, PE, MBA College of Mechanical Engineering Contents 內(nèi)容綱要 ? Importance of shading control and daylighting 遮陽和自然采光的重要性 ? Shading strategies 常見遮陽策略 ? Day lighting and building envelope 日光照明與建筑立面 ? Sample projects and successful stories 成功案例 ? Software 計(jì)算軟件 2 Windows, architecture love them, occupants love them. They are modern, stylish, provide better view, easy to build, easy to maintain What is the pain? Public buildings Office Residential Small mercials 3 But engineers hate them, regulators do not want them, because they are wasting energy What is the pain? Building codes all over the world are using description or energy budget method to regulate the window to wall ratio In summer, direct solar heat gain accounts for more than 50% of cooling load In winter, wall insulation value is about 10 times higher than that of conventional windows. Therefore, buildings in cold climate can only have small windows ? Windows are more important than any other building ponents in term of energy impact ? In cold climate, more than 50% heat loss are through windows ? In hot climate, direct solar heat gain is about 1/3 of cooling load ? Lighting energy consumption is more than heating and cooling bined in mercial buildings Lowenergy intensity design and windows Lowenergy intensity design and windows T h e Eff e c t o f W i n d o w o n B u i l d i n g En e r g y C o n s u m p ti o nF re s h a i r l o a d30%Eq u i p m e n t 2 5 %D i re ct s o l a rg a i n 2 5 %En v e l o p e h e a tg a i n 2 0 %W i n d o w 5 0 %W a l l 3 0 %R o o f 2 0 %0%20%40%60%80%100%120%A C p e a k l o a d E n v e l o p e h e a t g a i nAir conditioning peak load analysis in summer ? 50% of building envelope load are caused by windows ? Window shading in summer and window insulation in winter are two critical issues Year of Built, Government office building built at different years Energy survey results Year of