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首页> 外文期刊>Building and Environment >Analysing the impact of reflectance distributions and well geometries on vertical surface daylight levels in atria for overcast skies
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Analysing the impact of reflectance distributions and well geometries on vertical surface daylight levels in atria for overcast skies

机译：分析多云天空中反射率分布和井眼几何形状对心房垂直表面日光水平的影响

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摘要

This study investigated the impacts of different diffuse reflectance distributions and well geometries on vertical daylight factors and vertical internally reflected components in atria. Two forms of reflectance distribution patterns of wall surface were examined: horizontal and vertical reflectance band variation. The square atrium models studied have a broader WI range of 0.25-2.0, which represent shallow, medium and high atria. Radiance, a powerful package based on backward ray tracing technique, was used for the simulations of vertical daylight levels. The results show that different reflectance distributions of square atrium walls do have an impact on the vertical daylight factors and vertical internally reflected components under overcast sky condition. The impact relates to the orientation of the band with different reflectance distributions on the wall. Compared with the vertical band surface, the horizontal band surface has a much more complicated effect The horizontal distributions of the reflectances significantly affects the vertical daylight levels at the locations more than 30% atrium height on the wall. For an atrium with a height more than 1/2 the width, the effect tends to increase with the increasing well index. The vertical distributions of the reflectance, nevertheless, do not substantially take effect on the vertical daylight levels in atria except for some special reflectance distribution patterns.
机译：这项研究调查了不同的漫反射率分布和井的几何形状对心房中垂直日光因子和垂直内部反射分量的影响。研究了两种形式的壁面反射率分布模式：水平和垂直反射率带变化。所研究的方形中庭模型的WI范围更广，为0.25-2.0，分别代表浅，中和高心房。 Radiance是一种基于后向光线跟踪技术的功能强大的软件包，用于模拟垂直日光水平。结果表明，在阴天条件下，方形中庭墙的不同反射率分布确实会对垂直日光因子和垂直内部反射分量产生影响。该影响与在壁上具有不同反射率分布的波段的方向有关。与垂直波段表面相比，水平波段表面的影响要复杂得多。反射率的水平分布会显着影响墙壁上中庭高度超过30％的位置的垂直日光水平。对于高度大于宽度的1/2的中庭，效果会随着井指数的增加而增加。但是，除了某些特殊的反射率分布模式外，反射率的垂直分布基本上不会影响心房中的垂直日光水平。

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