Radiance of the circumsolar and background parts of skydome for buildings under random obstructions

Radiance of the circumsolar and background parts of skydome for buildings under random obstructions
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随机障碍物下建筑物天幕环日和背景部分的辐射度

DOI:
10.1016/j.enbuild.2021.110796
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发表时间:
2021-02
影响因子:
6.7
通讯作者:
Yang Yanping
Yang Yanping
中科院分区:
工程技术2区
文献类型:
--
作者:
Lou Siwei;Li Danny H. W.;Lun Isaac Y. F.;Huang Yu;Chen Wenqiang;Xia Dawei;Yang Yanping

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建筑围护结构上的漫射辐射是研究建筑热环境和能量的重要手段。在城市环境中,由于部分天穹会被不规则遮挡,因此需要确定天穹上的漫射辐射分布,以准确评估其辐射。在本研究中,通过几个有代表性的天空方向来描述这种分布,以指定天穹上的辐射变化特征,特别是太阳周围的衰减。每个天空元素的辐照度(通过水平漫射归一化)与常规的全球辐射和太阳高度相关,作为简单工程使用的全天空模型。根据对香港湿热地区不规则障碍物下垂直辐照度的两组为期一个月的野外测量(不同地点),其决定系数(R2)分别比许多模拟工具采用的经典的单向各向异性扩散模型高0.041和0.142,而在部分阴天,其ther2差值可达0.38。与分布模型相比,所提出的模型的ther2性能仍然可以达到0.057。因此,该方法对城市环境中的太阳辐射研究是有效的。
The diffuse radiation on building envelopes can be essential to the thermal environment and the energy study of buildings. Because a part of the skydome can be obstructed irregularly in city environments, the diffuse radiance distribution over the skydome should be determined to evaluate the radiation accurately. In this study, this distribution is described by several representative sky directions to specifying the radiance variation features over the skydome, especially the attenuation around the sun. The irradiance of each sky element (normalized by the horizontal diffuse) is correlated to the routine global radiation and the solar altitude as an all-sky model for simple engineering uses. According to two sets of one-month field measurements (in different sites) of the vertical irradiance under irregular obstructions in the hot and humid Hong Kong, the coefficient of determination (R2) is 0.041 and 0.142 higher than the classical single-direction anisotropic diffuse model that is adopted by many simulation tools, and theR2difference can be up to 0.38 for partly cloudy days. When compared to the distribution models, theR2outperformance of the proposed model can still be 0.057. The proposed approach is thus effective to the solar radiation studies in the city environments.
专为城市规模的太阳辐照度预测而定制的简化的基于矢量的模型
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发表时间: 2019-05
期刊: Solar Energy
影响因子: 6.7
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DOI: 10.7498/aps.60.069601
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