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Evaluating the cooling effects of greening for improving the outdoor thermal environment at an institutional campus in the summer

机译：在夏天评估机构校园中绿化的冷却效果以改善室外热环境

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摘要

The thermal environment can have several effects on people who use outdoor spaces; especially on university campuses were the thermal environments of educational living spaces are important. This study focuses on the importance of greening as a potential method for passive cooling and for use in reducing ambient air temperatures, especially at a pedestrian level. There are two main strategies of greening modification. These two strategies have been proposed to improve campus environments and aim to include more greening area by adding trees to current green areas and by growing a grass layer on the rooftop of educational buildings. In this study, two approaches are presented, including an on-site measurement and a numerical simulation model that uses ENVI-met. These greening modification methods were investigated regarding their local cooling effect. This study was conducted at the institutional campus of Saga University, Japan. We hypothesized that the average maximum temperature would decrease and reach 2.27 ℃in the peak of the summer (at 15:00) when the quantity of trees was increased by 20%. Furthermore, combining both modification methods led to the largest air temperature decrease with an average and maximum of 0.24 ℃ and 2.29 ℃, respectively. The results of this study allow university decision makers and planners to identify more precise green campus policies, which are necessary for improving the educational environment.
机译：高温环境会对使用室外空间的人产生多种影响。特别是在大学校园里，教育居住空间的热环境很重要。这项研究的重点是将绿化作为一种​​潜在的被动冷却方法，并用于降低环境空气温度，尤其是在行人水平的空气中，这一重要性。绿化改造主要有两种策略。已经提出了这两种策略来改善校园环境，并旨在通过向当前的绿地增加树木并在教育建筑物的屋顶上生长草层来包括更多的绿地。在这项研究中，提出了两种方法，包括现场测量和使用ENVI-met的数值模拟模型。研究了这些绿化改性方法的局部冷却效果。这项研究是在日本佐贺大学的机构校园内进行的。我们假设当树木数量增加20％时，夏季最高峰（15:00）的平均最高温度将降低并达到2.27℃。此外，两种修改方法的组合导致最大的空气温度下降，分别为平均和最大0.24℃和2.29℃。这项研究的结果使大学的决策者和计划者可以确定更精确的绿色校园政策，这对于改善教育环境是必不可少的。

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