Study On The Influence Of High-rise Buildings Layout On Urban Regional Thermal Environment

As the development of cities, the consumption of land resource is much bigger today. High-rise buildings have become the main choice in urban construction. There are more and more high-rise buildings in cities, and different layout of high-rise buildings will have different effects on the environment. At present domestic and international study on city and environment is mainly focused in two ways. The first one is the study on geographical environment—study on the rules of climate changes within certain region. The second one is the local environment of the city. They both ignore that the development of the city is the basic factor of the changes of the city’s local environment. These studies can not explain the principle of environmental changes reasonably. Fields of studies are scattered and circumscribed, and the contents and methods about the research are lack of innovation.There is no systemic interpretive theory to describe rules and effects on environment change from interspace of high-rise buildings in the city. Study on layout of high-rise buildings and study of correlation between space among buildings and environment change are limited. Knowledge of city space structure and environment change is separate. Research achievement lags the development of cities and it can not be used in the development of cities.Based on the above-mentioned research actualities, this paper presents the systemic study of the effects on urban thermal environment from high-rise buildings layout and new conception and research methods are proposed by combining architecture, urban planning, building environment and heat transfer and so on. Firstly, factors of urban thermal environment are analyzed. Effects on environment from urban high-rise buildings are described systematically. Through field investigation of representative regions, influence and characteristic between building space and environment are studied in different regions and different kinds of buildings. Measured data is used as the basis for numerical simulation. Secondly, three-dimensional numerical model for Changsha urban area is established, and distribution and space characteristic of high-rise buildings in urban area are analyzed. Thirdly, urban environment in large scale, middle scale, and small scale are simulated by using CFD. Urban regional thermal environment is analyzed and studied combined with measured data and methods improving regional thermal environment are proposed to avoid worse environment in city construction and to make urban environment comfortable.The innovative studies in this paper are:(1)Effects on thermal environment from high-rise buildings layout are studied firstly in provincial capital city from urban area to urban center and then to group area. The three study levels are systemic, continuous and consistent.(2)Urban regional thermal environment are systematically studied firstly from two-dimension to three-dimension. Three-dimensional numerical model of the whole city is established, and the study is developed in multi-dimensions and multi-levels.(3)Enclosure level of multi-dimensional space of high-rise buildings layout is proposed, which means block enclosure and group buildings enclosure.(4)Ventilation corridor of the city structured by roads is suggested, and low dimensional ventilation network combined with rivers is developed.(5)High dimensional ventilation corridor structured by high-rise buildings is proposed.Qualitative and quantitative research methods are adopted synthetically in this paper. Multi-scale and multi-level analysis is developed in the city which has the climate of hot summer and cold winter. Effect on thermal environment from high-rise buildings is further studied by using numerical simulation combined with actual measurement synthetically. It provides clear synthetic transdisciplinary research mentality and methods to study urban regional thermal environment quantitatively and urban planning and building design qualitatively. And research conclusions of the paper can be valuable referenced suggestion to development and adjustment of urbanization.