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首页> 外文期刊>The Science of the Total Environment >Investigation of extensive green roof outdoor spatio-temporal thermal performance during summer in a subtropical monsoon climate
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Investigation of extensive green roof outdoor spatio-temporal thermal performance during summer in a subtropical monsoon climate

机译：亚热带季风气候下夏季大面积绿化屋顶室外时空热性能的研究

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摘要

The thermal performance of green roofs is usually site-specific and changes temporally. Hence, thermal performance evaluation is necessary to optimize green roof design and its cooling effect. In this paper, we evaluated the outdoor spatio-temporal performance of a full-scale extensive green roof (EGR) inNanjing, China throughout a summer at three heights (30, 60and 120cm). We found the EGR exhibited an overall slight diurnal cooling effect at all three heights (-0.09, -0.23, and - 0.09 degrees C, respectively), but there was an obvious warming effect at a couple of specific hours during daytime. Especially on sunny days, the maximum warming effect at all three heights was 1.59, 0.59, and 0.38 degrees C, respectively. During the night, the EGR had a pronounced cooling effect of -0.63, -0.40, and - 0.15 degrees C, respectively. Among the weather scenarios, sunny days had the highest impact on the EGR's thermal performance, while effects were less pronounced on cloudy and rainy days. The average range of hourly air temperature difference at 30 cm between EGR and a bare roof on selected days was 4.02 (sunny), 2.67 (cloudy), and 0.74 degrees C (rainy). The results ofmultiple-regression analyses showed strong and significant correlations of air temperature difference between the EGR and a bare roof with differences in relative humidity, net radiation, several measures of soil and surface temperature, and soil moisture as well as average solar radiation, air temperature and wind speed. The results implied that both the components of the EGR, such as green vegetation and the soil substrate layer, and the microclimate created by the EGR can feed back and contribute to the thermal performance of an EGR. Through this full-scale EGR research in a subtropical monsoon climate, we provide the scientific basis and actionable practices for green roof planning and design to alleviate the urban heat island effect towards designing climate-resilient cities. (C) 2019 Published by Elsevier B.V.
机译：绿屋顶的热力性能通常因地而异，并且会随时间变化。因此，必须进行热性能评估以优化屋顶绿化设计及其冷却效果。在本文中，我们评估了整个夏季在三个高度（30、60和120厘米）的南京大尺度绿化屋顶（EGR）的室外时空性能。我们发现EGR在所有三个高度（分别为-0.09，-0.23和-0.09摄氏度）都表现出总体轻微的昼夜降温效果，但是在白天的几个特定小时内有明显的变暖效果。特别是在晴天，三个高度的最大变暖效应分别为1.59、0.59和0.38摄氏度。在夜间，EGR的冷却效果分别为-0.63，-0.40和-0.15摄氏度。在天气情况中，晴天对EGR的热性能影响最大，而在阴天和雨天的影响较小。在选定的日期，EGR与裸露的屋顶之间30 cm处每小时平均气温差的平均范围为4.02（晴天），2.67（多云）和0.74摄氏度（阴雨）。多元回归分析的结果表明，EGR和裸露屋顶之间的空气温差与相对湿度，净辐射，土壤和地表温度的几种测量以及土壤湿度以及平均太阳辐射，空气的差异之间存在强烈且显着的相关性。温度和风速。结果表明，EGR的两个组件（例如绿色植被和土壤基质层）以及由EGR产生的微气候都可以反馈并有助于EGR的热性能。通过在亚热带季风气候下进行的大规模EGR研究，我们为屋顶绿化规划和设计提供了科学依据和可操作的实践，以减轻城市热岛效应对设计具有气候适应性的城市的影响。 （C）2019由Elsevier B.V.发布

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