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Effects of Urban Vegetation on Microclimate and Building Energy Demand in Winter: an Evaluation Using Coupled Simulations

SUSTAINABLE CITIES AND SOCIETY(2024)

Xi An Jiao Tong Univ

Cited 8|Views21
Abstract
As an important landscape, the evergreen vegetation is prevailing, even in cold region cities. However, the impacts of promoting vegetation on microclimate and building heating load (BHL) are still inexplicit. This study validated the feasibility of a new-developed coupled model that linked ENVI-met and EnergyPlus, for predicting the microclimate and BHL in winter. The impacts of vegetation configuration changes on the performances of three typical urban blocks in Xi'an, a high-density city in the cold region of China, were then evaluated. When the leaf area index of green lands increased from 0.79 to 4.77 m2/m2, a decrease of 3.27 degrees C on mean radiant temperature, a decrease of 0.48 m/s on wind speed, and an increase of 0.47 degrees C on air temperature at the block scale could be observed. To the three blocks, the BHL of thermal zones in the height range of tree canopy increased by 7.16 %, 1.52 % and 3.57 % during a sunny day, and decreased by 2.80 %, 0.55 %, and 0.06 % during a cloudy day maximally. Overall, the evergreen vegetation produced negative impacts on the building energy efficiency of cold region cities. For urban planners, it's advisable to concentrate evergreen plants in highrise blocks to mitigate such disadvantages.
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Key words
Urban vegetation,Microclimate,Building energy,Coupled simulation
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要点】:研究利用耦合模拟方法评估了城市植被对冬季微气候和建筑能耗的影响,发现常绿植被会对寒冷地区城市建筑能效产生负面影响。

方法】:研究开发了一种新的耦合模型,将ENVI-met和EnergyPlus软件结合,用于预测冬季的微气候和建筑能耗。

实验】:在西安三个典型的高密度城市街区进行了植被配置改变对微气候和建筑能耗影响的评估,实验使用的数据集为冬季的气候和建筑能耗数据,结果表明植被增加会导致辐射温度降低、风速减小和空气温度升高,同时在不同天气条件下对建筑能耗有不同的影响。