Analysis Of The Plant Configuration Mode' Impact On The Microclimate In The Enclosed Residential Area During Summer

The common goal of building a healthy and comfortable living environment has increasingly being concerned with the accelerate urbanization and the improvement of people's living standards.It is universialy acknowledged that as the key part of city residential area,the green land plays an important role in maintaining ecological balance,regulating residential area and improving micro-climate environment,which occupied a crucial part of the landscape and urban ecosystem.Currently,the analysis about the influence of the green space on the micro-climate in the residential area is mostly focusing on the study of the quantity and composition in greening rather than the quantitative analysis of the tree patch.With the development of numerical simulation technology,the Envi-met and other urban micro-climate simulation softwares have been applied to amount of researches under the development of numerical simulation technology and the evaluation of outdoor thermal comfort,which has been gradually added based on the previous thermal environment and wind environment researches.By the help of Micro-climate Simulation Software,this study takes the enclosed residential area central area in Shenyang as an example,which simulates the establishment of multiple cases in central greenbelt under the premise of limitating the same amount of green space to determine the quantitative indicators which includes plant species composition and placement scheme.Accordingly,we continue to anlayze the micro-climate environment through four aspects:air temperature,air humidity,wind speed and expected thermal comfort index PMV(Predicted Mean Vote)values.The conclusions are as follows:1.The effect of the the lawn + tree model is better than both the lawn model and lawn + shrub model in the aspects of reducing air temperature,slowing down wind speed,adjusting PMV value and increasing the relative humidity.With the increase of tree height,the increased amplitude of relative humidity and decreased amplitude of wind speed will reduce,while there is slightly change on the air temperature and PMV value during the typical summer day;in addition,the increased degree of relative humidity and decreased degree of PMV value will increase,while the decreased rate of wind speed will reduce and slightly change was found on the air temperature during the extreme summer day.2.When the tree pattern is center located,its impact on air temperature,the range of wind speed reducing and the range of relative humidity increasing are superior to the other positions that tree located in;however,as for the range of PMV value reducing the tree pattern that located in the enclosed position take the largest effect.Moreover,the region of the comparably decent thermal comfort and the location of the tree patem have the obvious coincidence.The impact of the tree pattern on the range of air temperature decrease,wind speed increase,the PMY value reduce and relative humidity increase at residential area,being center located are superior to scattered arrangement.What's more,the region of the comparably decent thermal comfort will disperse with the reduction of the tree patern contagion.The location and contagion of tree pattern had slightly effect on the amplitude of air temperature,wind speed,the magnitude of PMV reduction and the magnitude of relative humidity increase.