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Screening of Tree Species for Improving Outdoor Human Thermal Comfort in a Taiwanese City

机译：改善台湾城市户外人类热舒适性的树种筛选

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摘要

Tropical cities can use urban greening designs featuring trees that provide shade and cooling in hot outdoor environments. The cooling effect involves numerous tree characteristics that are not easy to control during planting design, such as the canopy size and the optical properties of leaves. Planting the appropriate tree species dominates the cooling effects and the human thermal environment. Based on environmental and plant data, including the tree species, crown diameter of trees, physiologically equivalent temperature (PET), and sky view factor (SVF) in an outdoor space, a series of hierarchical cluster analysis (HCA) procedures was implemented to identify the tree species that are appropriate for improving thermal comfort. The results indicated strong correlations between SVF, average crown diameter, and PET. SVF decreased as the average crown diameter increased. For the average crown diameter of trees in an area wider than 1.5 m, the cooling effect was especially dominated by the tree species. Therefore, 15 species were screened by HCA procedures, based on a similar cooling effect. These species had various cooling effects, and were divided into four categories. Tree species, such as Spathodea campanulata and Cinnamomum camphora , had the appropriate crown diameter and cooling effect for the most comfortable thermal environment.
机译：热带城市可以使用带有树木的城市绿化设计，这些树木可以在炎热的室外环境中提供遮荫和降温。冷却效果涉及许多树木特征，这些特征在种植设计期间不易控制，例如树冠尺寸和树叶的光学特性。种植适当的树种将主导降温效果和人类热环境。基于环境和植物数据，包括树木，树冠直径，生理等效温度（PET）和室外空间中的天空视野因子（SVF），实施了一系列层次聚类分析（HCA）程序来识别适合改善热舒适性的树木。结果表明SVF，平均牙冠直径和PET之间有很强的相关性。 SVF随着平均牙冠直径的增加而降低。对于大于1.5 m的区域中树木的平均树冠直径，冷却效果尤其受树木的影响。因此，基于类似的冷却效果，通过HCA程序筛选了15种。这些种类具有不同的降温作用，分为四类。树木种类，例如Spathodea campanulata和Cinnamomum camphora，具有合适的树冠直径和降温效果，可提供最舒适的热环境。

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