Predicting daylight illuminance and solar irradiance on vertical surfaces based on classified standard skies
Predicting daylight illuminance and solar irradiance on vertical surfaces based on classified standard skies
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DOI：
10.1016/j.energy.2013.02.049
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发表时间：
2013-05
期刊：
影响因子：
9
通讯作者：
D. Li;Natalie T.C. Chau;K. K. Wan-K.
中科院分区：
文献类型：
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作者：
D. Li;Natalie T.C. Chau;K. K. Wan-K.
太阳辐照度和室外照度，特别是垂直表面上的太阳辐照度和室外照度，对于节能建筑设计和采光方案至关重要。在香港，只有每小时的水平太阳总辐射数据已被系统地记录了很长一段时间，但没有测量的日光照度存在。2003年，国际照明委员会（CIE）采用了15个标准天空，涵盖了世界上所有可能的天空光谱。同一类别的标准天空将具有相同的明确定义的天空辐射率和亮度分布。一旦确定了天空，就可以获得感兴趣的表面处的基本太阳辐照度和日光照度，涉及简单的数学表达式。本文提出了一种基于CIE标准天空的太阳垂直辐照度和日光照度的数值计算方法。分析中使用了2004年1月至2005年12月期间记录的气候参数。计算方法的性能是根据同期测量的数据进行评估的。年RMSE范围为17.7%-20.8%的日光照度预测和17.9%-19.8%的太阳辐照度估计。研究结果提供了一种替代方法来计算太阳辐照度和日光照度的垂直表面上面临的各种方向。
Solar irradiance and outdoor illuminance, particularly on vertical surfaces are crucial to energy-efficient building designs and daylighting schemes. In Hong Kong, only hourly horizontal global solar radiation data have been systematically recorded for a long period but no measurements of daylight illuminance exist. In 2003, the International Commission on Illumination (CIE) adopted a range of 15 standard skies covering the whole probable spectrum of skies in the world. Standard skies of the same category would have the identical well-defined sky radiance and luminance distributions. Once the skies are identified, the basic solar irradiance and daylight illuminance at the surfaces of interest can be obtained, involving simple mathematical expressions. This study presents a numerical approach to predict the vertical solar irradiance and daylight illuminance based on the CIE standard skies. Climatic parameters recorded between January 2004 and December 2005 are used in the analysis. The performance of the calculation method is evaluated against data measured in the same period. The annual RMSEs were found ranging from 17.7% to 20.8% for daylight illuminance prediction and 17.9%–19.8% for solar irradiance estimation. The findings provide an alternative to compute solar irradiance and daylight illuminance on vertical surfaces facing various orientations.