Numerical Analysis Of Human Comfort Based On Outdoor Wind And Thermal Environment

Due to the accelerating process of urbanization and the improvement of human life quality,the contradiction between the rationality of the existing urban architectural design and the increasing suitability of people for the living environment is becoming more and more obvious.The reasonable planning of residential area based on the comfort degree of wind thermal environment in the design stage can reduce the cost of later optimization,reduce the potential safety hazards of pedestrians induced by wind environment,increase the comfort degree of residents,and effectively solve the demand problems of residents in the existing urban architectural design.This paper aims to analyze the internal comfort of the community under different building orientations and the comfort of the community under more suitable building orientations,and put forward the corresponding planning opinions.The main contents are as follows:(1)Conduct field test on the target community,and obtain the data of three parameters of wind speed,temperature and humidity in the wind and thermal environment through the test.Use the test data and The Sware(THS)software simulation data for error analysis,so as to verify the accuracy and rationality of the model and ensure the accuracy of subsequent simulation.(2)Simulate and analyze the wind and thermal environment under seven directions and extract the data respectively.Determine the membership function equations of the three parameters by using fuzzy set theory,matrix and correlation analysis,and distribute the weight of the three membership function equations to establish a New Air Diffusion Performance Indexmathematical(NADPI)model that integrates three elements to measure comfort.Through error analysis and verification with the comprehensive comfort index,the slope of trend lines at each measuring point under the two numerical models is similar,indicating that the calculated values of NADPI mathematical model are within the allowable error range.(3)The three parameters of wind speed,temperature and humidity of a residential area under seven different building orientations were obtained by using thyswell fluid simulation software.Through model calculation and comparison,the NADPI value of the residential area was the largest,which was 0.61,when the seven orientations were 15°west-central.Then,the wind-thermal environment of the residential area at 15° w was simulated and NADPI values of six measuring points A,B,C,D,E and F were calculated,so as to analyze its comfort characteristics and provide planning suggestions for building planning.