A novel method for fast sky conditions identification from global solar radiation measurements

A novel method for fast sky conditions identification from global solar radiation measurements
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一种根据全球太阳辐射测量快速识别天空状况的新方法

DOI:
10.1016/j.renene.2020.06.114
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发表时间:
2020-12
期刊:
影响因子:
8.7
通讯作者:
Yang Zhao
Yang Zhao
中科院分区:
工程技术1区
文献类型:
--
作者:
Siwei Lou;Yu Huang;Danny H.W. Li;Dawei Xia;Xiaoqing Zhou;Yang Zhao

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天空条件以及相应的亮度和辐射率分布模式对于采光、能源和热环境研究是必不可少的。CIE标准天空通过严格的亮度分布直观地定义了多云、部分多云和晴朗的天空条件,然而,这些亮度分布通常由复杂和不常见的测量(例如多个垂直方向上的辐射)确定。本研究提出了一种简单的方法来确定每小时的天空条件,从全球水平辐照度(EHG),这是最广泛的访问气象站与基本的辐射测量设施。因此,对于简单的应用,避免了复杂的测量。尤其是部分多云的天空,其EHG测量值与理论无云条件的显著差异是可以识别的。该方法成功地解释了ISO/CIE标准天空条件及其漫反射亮度和辐射亮度分布。从两个不同气候的地点的数据集,该方法正确识别7%以上的天空条件比以前的工作时,直接光束和散射辐射测量是不可访问的。因此,该模型对于只有地面太阳辐射测量的地方的太阳能研究至关重要。
Sky conditions, and the corresponding luminance and radiance distribution patterns are essential to daylighting, energy and thermal environmental studies. The CIE Standard Skies define the overcast, partly cloudy, and clear sky conditions intuitively by rigorous luminance distributions, which are, however, usually determined by sophisticated and uncommon measurements (e.g. radiation in multiple vertical directions). This study proposes a simple approach to identifying the hourly sky conditions from the global horizontal irradiance (EHG) that is most widely accessible in weather stations with basic radiation measurement facilities. The sophisticated measurements are, therefore, avoided for simple applications. The partly cloudy sky, especially, is identified by the notable disparity of itsEHGmeasurement from the theoretical cloudless condition. The proposed approach interprets the ISO/CIE Standard Sky conditions and their diffuse luminance and radiance distributions successfully. From the datasets at two sites with different climates, the approach correctly identifies 7% more sky conditions than a previous work when the direct beam and diffuse radiation measurements were not accessible. The model can thus be essential to solar energy studies for places with ground-based solar radiation measurements only.
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发表时间: 2003-06
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