Study On The Method Of Evaluating Residential Thermal Environment At The Scheme Design Stage In The City With Hot And Humid Climate

Urbanization is an inevitable trend in the development of society,and the problem of urban heat island effect and urban high temperature are becoming more and more serious.Especially in the hot-humid region in south China,which summer is hot and long with humid air,the problem of urban thermal environment is particularly serious.As an important part of a city,the thermal environment of urban residential area is related to urban heat island,building energy consumption and human health.Through effective planning and design means to create a good residential thermal environment has become urgent.In order to create a good residential thermal environment,planners and designers need to predict and evaluate the thermal environment of the residential project.However,there is still a lack of a tool which can evaluate the thermal environment of the residential area at the design stage.In order to solve the existing problems,this paper proposes a method of evaluating residential thermal environment which is suitable for the scheme design stage,and takes Nanning as the research object.Through this method,the regulation rules of residential thermal environment in the research site can be mastered,and a tool which can be used to evaluate residential thermal environment rapidly at the scheme design stage will be provided for local planners and designers.Firstly,the typical planning indexes at the scheme design stage are selected according to the formation principle of residential thermal environment and the task requirements at the scheme design stage.It includes:residential layout pattern,building size,building orientation,building density,average building height,greening rate,distance between buildings and stilt floor rate.Secondly,by means of network information collection,geographic information system and field research,the basic data of the residential districts in Nanning which were built in the last ten years were obtained.By analyzing the basic data of residential district in Nanning,the representative model of residential district in Nanning has been established and the value range of each planning index has also been determined.According to the method of univariate analysis,the regulation principle of residential districts in Nanning was analyzed by using DUTE(an analysis tool for building thermal environment).According to the simulation results,the effects of different planning indexes on improveing the thermal environment of residential districts in Nanning are summarized.The simulation results show that the building density has the greatest influence on the thermal environment of residential districts in Nanning.Finally,by comparing the influence degree on residential thermal environment and the correlation with thermal environment indexes of planning indexes,building density,average building height,greening rate,East-West distance between buildings and stilt floor rate are selected as variables of the evaluation model.Then the evaluation model of residential thermal environment at typical time in Nanning was obtained by the multifactor combination simulation and multiple regression analysis.Actual projects are selected to simulate and verify the evaluation model.Comparison results show that Average error throughout the day of the evaluation model is between 0.1 ? and 0.5?,which can meet the demand of preliminary evaluation at the scheme design stage.It also proves the feasibility of the evaluation method proposed in this paper.The evaluation method has universal applicability and will play a positive role in improving the thermal environment of residential districts and promoting the construction of green and low-carbon cities.