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Evaluation of energy saving potential of an urban green space and its water bodies

机译：城市绿地及其水体的节能潜力评估

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摘要

Urban green space in modern cities displays a cooling effect on hot summer days, based on which its energy saving potential can be estimated. The current work studies the energy saving potential (ESP) of a Chinese traditional garden in Beijing on a hot summer day and provides the corresponding spatiotemporal distribution maps, with a specific focus on the effect of the garden's water body. For this purpose, numerical simulation using ENVI-met model is created and validated by field measurement. The maximum cooling effect in the garden is a change of 1.3 degrees C in air temperature reduction at 14:00. Of this change, over 0.8 degrees C is caused by the water body. The center of the water body has a significant cooling effect due to evaporation, absorption of short wave solar radiation and desirable ventilation conditions. Based on the cooling effect, the spatial distribution and time evolution of heat reduction and ESP for the garden and its water body is obtained. Time evolution of spatial 3D heat reduction and ESP of the entire garden shows that the best performance is achieved at around 14:00 within a vertical height of 0-20.5 m. The corresponding values are 1.0 x 10(8)J and 80.7 kWh. The best performance of the water body occurs at around 14:00-15:00 when the heat reduction and ESP are 5.4 x 10(7)J and 43.6 kWh. Finally, the distribution maps of spatiotemporal heat reduction and ESP caused by the water body and entire garden within a height of 0-20.5 m from 8:00 to 18:00 are constructed. The total heat reduction values caused by the water body and the entire garden were 4.7 x 10(8) and 8.6 x 10(8)J, and the corresponding ESP values were 379.3 and 694.1 kWh. (C) 2019 Elsevier B.V. All rights reserved.
机译：现代城市中的城市绿地在炎热的夏季表现出降温效果，据此可以估算其节能潜力。当前的工作研究了炎热的夏天在北京的中国传统花园的节能潜力（ESP），并提供了相应的时空分布图，重点关注花园水体的影响。为此，创建了使用ENVI-met模型的数值模拟并通过现场测量进行了验证。花园中最大的降温效果是在14:00降低空气温度1.3摄氏度。在这种变化中，水体导致温度超过0.8摄氏度。由于蒸发，吸收短波太阳辐射以及理想的通风条件，水体中心具有明显的冷却效果。根据降温效果，得到花园及其水体降温和ESP的空间分布和时间演化。整个花园的空间3D减少热量和ESP的时间演变表明，在14:00左右的垂直高度0-20.5 m内可获得最佳性能。相应的值为1.0 x 10（8）J和80.7 kWh。水体的最佳性能出现在14：00-15：00左右，此时的热量减少和ESP为5.4 x 10（7）J和43.6 kWh。最后，绘制了08:00至18:00之间0-20.5 m高度的水体和整个花园引起的时空热量减少和ESP的分布图。水体和整个花园造成的总热量减少值为4.7 x 10（8）和8.6 x 10（8）J，相应的ESP值为379.3和694.1 kWh。 （C）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《Energy and Buildings》 |2019年第4期|58-70|共13页
  • 作者

    Xu Xiyan; Liu Shuming; Sun Shibo; Zhang Wenwei; Liu Ying; Lao Zhaoming; Guo Guancheng; Smith Kate; Cui Yong; Liu Wei; Garcia Ester Higueras; Zhu Jianning;

  • 作者单位

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Beijing Forestry Univ, Coll Landscape Architecture, Beijing 100083, Peoples R China;

    Beijing Orient East Design Landscape Co Inc, Beijing 100015, Peoples R China;

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Zhongshan Meteorol Serv, Zhongshan 528400, Peoples R China;

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Boda Water Co Ltd, Beijing 100176, Peoples R China;

    Beijing Forestry Univ, Coll Landscape Architecture, Beijing 100083, Peoples R China;

    Univ Politecn Madrid, Escuela Tecn Super Arquitectura, E-28040 Madrid, Spain;

    Beijing Forestry Univ, Coll Landscape Architecture, Beijing 100083, Peoples R China;

  • 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

    Energy saving; Cooling effect; Green space; Water body; ENVI-met; Urban heat island;

    机译：节能;制冷效果;绿色空间;水体;ENVI-met;城市热岛;

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