摘要
Finding sustainable energy resources is essential to face the increasing energy demand.Trees are an important part of ancient architecture but are becoming rare in urban areas.Trees can control and tune the pedestrian-level wind velocity and thermal condition.In this study,a numerical investigation is employed to assess the role of trees planted in the windward direction of the building complex on the thermal and pedestrian wind velocity conditions around/inside a pre-education building located in the center of the complex.Compared to the previous studies(which considered only outside buildings),this work considers the effects of trees on microclimate change both inside/outside buildings.Effects of different parameters including the leaf area density and number of trees,number of rows,far-field velocity magnitude,and thermal condition around the main building are assessed.The results show that the flow velocity in the spacing between the first-row buildings is reduced by 30%-40% when the one-row trees with 2 m height are planted 15 m farther than the buildings.Furthermore,two rows of trees are more effective in higher velocities and reduce the maximum velocity by about 50%.The investigation shows that trees also could reduce the temperature by about 1℃around the building.
面对日益增长的能源需求,寻找可持续的能源资源至关重要。树木是古建筑的重要组成部分,但在城市地区却越来越稀少。树木可以控制和调节行人高度的风速和热环境。本论文采用数值研究的方法评估在建筑综合体迎风方向种植的树木对建筑综合体中心的学前教育建筑周围/内部的热环境和行人风速条件的作用。与以前的研究(只考虑建筑物外部)相比,本研究考虑了树木对建筑物内外小气候变化的影响。评估了不同参数包括叶面积密度和树的数量、行数、远场速度大小和主楼周围热环境对建筑的影响。结果表明:在距建筑物15 m处种植2 m高的单行树木,可使第一排建筑物间距内的流速降低30%~40%;此外,在更高的速度下,种植两行树更有效,可以使最大速度降低约50%。调查显示,树木还可以使建筑物周围的温度降低约1℃。
