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Light distribution in air-supported pneumatic structures: Comparison of experimental and computer calculated daylight factors

机译：空气支撑气动结构中的光分布：实验和计算机计算的日光因子的比较

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摘要

This study examines daylight distribution and illumination levels with daylight factors (DFs) inside an air-supported (pneumatic) structure (50.0 m long, 25.0 m wide and 11.0 m high). The DFs values were determined experimentally for 45 different points on the playground floor. Two sets (set1 and set2) of time dependent illuminance measurements were performed at overcast but variable (5400-2400 lx) sky conditions similar to the CIE overcast sky. Results revealed that the DFs values were in the range from 1.1% to 1.7% and were not evenly distributed across the interior, with the greatest values at the centre and the smallest at the edges of the playground floor. Composition of the membrane was studied with SEM micrographs and by measuring the Raman and Infrared spectra. Hemispherical (total) transmittance (TT(lambda)) and reflectance (TR(lambda)) spectra (300-2500 nm) of the membrane used were measured and averaged over the visible spectral region giving TTvis and TRvis and haze, the latter confirming that fabrics strongly scattered the incoming solar radiation. The surface of the fabrics was characterized by contact angle measurements which indicates that the fabrics were weakly hydrophobic and strongly soiled. Daylight factor values obtained from the DAYSIM computer simulations matched well the experimental ones allowing further studies of daylighting inside the translucent dome. It was found that various colour patterns substantially affected the DFs values. DAYSIM calculations also demonstrated the possible use of aerogel insulation blanket as composite fabrics for air-supported structures. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项研究通过空气支撑（气动）结构（长50.0 m，宽25.0 m和高11.0 m）中的日光因子（DF）来检查日光分布和照明水平。 DF值是通过实验确定操场上45个不同点的值。在阴天但与CIE阴天相似的可变（5400-2400 lx）天空条件下，进行了两组时间依赖性照度测量（set1和set2）。结果显示，DFs值在1.1％到1.7％的范围内，并且在整个内部分布不均匀，其中操场中心的最大值最大，而边缘则最小。用SEM显微照片并通过测量拉曼和红外光谱研究膜的组成。测量所用膜的半球（总）透射率（TTλ）和反射率（TRλ）光谱（300-2500 nm），并在可见光谱范围内取平均值，得到TTvis和TRvis以及雾度，后者证实了织物强烈散射了入射的太阳辐射。织物的表面通过接触角测量来表征，这表明织物是弱疏水的和强污染的。从DAYSIM计算机模拟获得的日光因子值与实验值非常匹配，从而可以进一步研究半透明圆顶内部的日光。发现各种颜色图案基本上影响了DF值。 DAYSIM的计算还表明，可以将气凝胶隔热毯用作空气支撑结构的复合面料。 （C）2017 Elsevier Ltd.保留所有权利。

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