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Optimizing the beam and sky diffuse radiation calculations under random obstructions of urban environments

机译：在城市环境随机障碍下优化光束和天空散射辐射计算

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摘要

Solar radiation is important in studies of the energy and environment of buildings. Calculations of the direct beam and sky diffuse radiation, however, usually rely on numerical approaches, which can lead to notable calculation burdens. This research evaluates the update interval of the daily solar position series and the skydome discretization densities as they affect the estimation accuracies of the direct beam and sky diffuse radiation, respectively. Additionally, an approach is proposed for studying the direct beam radiation using a number of representative sun directions, the density of which is optimized for efficient radiation studies under external obstructions. Field measurements and simulations show that 61 sky elements can be sufficient for diffuse radiation estimations in low-latitude regions. For the direct beam, on the other hand, more than 1100 representative sun directions are necessary. The accuracy is comparable to that of the approach in which the sun position is updated in the calculation interval every 2?10 days. The representative sun direction approach and the results of the optimized day interval and sky discretization density are essential to efficient building simulations conducted at high frequencies.
机译：太阳辐射在建筑物能源和环境的研究中是重要的。然而，直接梁和天空漫射辐射的计算通常依赖于数值方法，这可能导致显着的计算负担。该研究评估了每日太阳能位置系列的更新间隔和Skydome离散化密度，因为它们分别影响直接梁和天空漫射辐射的估计精度。另外，提出了一种方法，用于使用多种代表性的太阳方向研究直接光束辐射，其密度优化了外部障碍物下的有效辐射研究。现场测量和模拟表明，在低纬度地区的漫射辐射估计，61天空元素可以足够。另一方面，对于直接梁，需要超过1100个代表性的太阳方向。准确性与每2天在计算间隔中更新太阳位置的方法的准确性相当。代表性的太阳方向方法和优化的日间间隔和天空离散化密度的结果对于高频率进行高效的建筑模拟至关重要。

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  • 来源
    《Building and Environment》 |2021年第6期|107806.1-107806.13|共13页
  • 作者

    Lou Siwei; Huang Yu; Li Danny H. W.; Xia Dawei; Zhou Xiaoqing; Zhao Yang;

  • 作者单位

    Guangzhou Univ Sch Civil Engn 230 Guangzhou Higher Educ Mega Ctr West Outer Guangzhou 510006 Peoples R China;

    Guangzhou Univ Sch Civil Engn 230 Guangzhou Higher Educ Mega Ctr West Outer Guangzhou 510006 Peoples R China;

    City Univ Hong Kong Dept Architecture & Civil Engn Bldg Energy Res Grp Kowloon Tat Chee Ave Hong Kong Peoples R China;

    Guangzhou Univ Sch Architecture & Urban Planning 230 Guangzhou Higher Educ Mega Ctr West Outer Guangzhou 510006 Peoples R China;

    Guangzhou Univ Acad Bldg Energy Efficiency Guangzhou 510006 Peoples R China|Guangzhou Univ Guangdong Prov Key Lab Bldg Energy Efficiency & A Guangzhou 510006 Peoples R China;

    Guangzhou Univ Sch Architecture & Urban Planning 230 Guangzhou Higher Educ Mega Ctr West Outer Guangzhou 510006 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar radiation; Direct beam; Sky diffuse; Calculation efficiency; Skylines;

    机译：太阳辐射;直束;天空扩散;计算效率;天际线;

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