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Effects of tree shading and transpiration on building cooling energy use

机译：树木遮荫和蒸腾作用对建筑制冷能耗的影响

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摘要

Building cooling energy use is regarded as the hot topic of building research due to its increasing trend at a rate proportional to the total direct energy use in urban areas nowadays. Urban greening as an effective countermeasure in reducing building cooling load has been attracting close attention although there is a shortage of quantitative measures for applying the general idea to a specific site or building. This study addresses this problem. The cooling effect of trees around buildings and the influence of tree characteristics on building cooling load reduction was quantified using microclimate field measurements and sap flow rate of trees. By integrating approaches of field measurements of microclimate and tree characteristics into EnergyPlus simulation of building energy use, the cooling effects of trees due to both shading and transpiration on buildings were quantified and discussed. Four scenarios were developed based on different tree characteristics for quantifying the influence of trees oh saving of building energy use: Scenario 1 with treeless condition, Scenario 2 with existing trees condition in a case of Nanjing City, Scenario 3 with more tree shading condition, and Scenario 4 with more tree transpiration condition. The simulation results showed that compared to Scenario 1, Scenario 2 can reduce building energy use by 10.3% due to the benefits from existing trees shading and transpiration. More shading in Scenario 3 and a higher transpiration rate in Scenario 4 can reduce building energy use by 15.2% and 12.4%, respectively in comparison to that in Scenario 1. (C) 2017 Elsevier B.V. All rights reserved.
机译：建筑冷却能源的使用被认为是建筑研究的热门话题，因为它的发展趋势与当今城市地区直接能源使用总量成正比。尽管缺乏将总体思路应用于特定场所或建筑物的定量措施，但城市绿化作为减少建筑物制冷负荷的有效对策一直受到密切关注。这项研究解决了这个问题。利用微气候场测量和树木的树液流量来量化建筑物周围树木的降温效果以及树木特性对建筑物降温负荷的影响。通过将微气候和树木特征的现场测量方法整合到EnergyPlus模拟的建筑能耗中，量化并讨论了由于阴影和蒸腾作用对建筑物造成的树木的冷却效果。根据不同的树木特征，开发了四个方案，以量化树木对节省建筑能耗的影响：在无树情况下的方案1，在南京市情况下，在已有树木情况下的方案2，在树荫下的情况较多的方案3，以及场景4中有更多的树木蒸腾条件。仿真结果表明，与方案1相比，方案2由于现有树木遮荫和蒸腾作用的有益效果，可将建筑能耗降低10.3％。与方案1相比，方案3中更多的阴影和方案4中更高的蒸腾速率可以分别减少建筑能耗15.2％和12.4％。（C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Energy and Buildings》 |2018年第1期|382-397|共16页
  • 作者

    Hsieh Chun-Ming; Li Juan-Juan; Zhang Liman; Schwegler Ben;

  • 作者单位

    Tongji Univ, Coll Architecture & Urban Planning, Big Data & Urban Analyt LAB, Dept Urban Planning, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Walt Disney Co China Ltd, Disney Res CHINA, 624 West Jianguo Rd, Shanghai 200031, Peoples R China;

    Tongji Univ, Coll Architecture & Urban Planning, Dept Landscape Architecture, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Building cooling energy; EnergyPlus; Microclimate; Trees shading; Transpiration;

    机译：建筑冷却能;EnergyPlus;微气候;树木遮荫;蒸腾作用;

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