Study On The Temperature Expressivity Of Outdoor Thermal Environment Measurement Point Based On Numerical Simulation

Measurement method is one of the most commonly used methods in outdoor thermal environment research.The data obtained from measurement is the basis of relevant research.Perfect measurement method is very important for accurate data acquisition.At present,there is a shortage in the research on the measured thermal environment.Scholars mostly focus on the law analysis of the measured data and ignore the measured process itself,resulting in this part appears to be a little scattered and simple,and the selection and arrangement of the measured points in the measurement also has a certain degree of randomness.In this paper,the existing thermal environment measurement methods are sorted out and the measured measurement points are studied.Based on the air temperature,an important thermal environment parameter,the temperature expressivity degree of the measured measurement points is defined.Taking the public green space and green roads in residential areas as examples,the influence of different factors on the temperature expressivity degree of the measured measurement points is studied.First of all,literature research was carried out on the research on outdoor thermal environment in recent ten years.Based on the actual content in the literature related to the description on the basis of the testing process on the preparation and preliminary combing,summed up in three existing arrangement of measuring points,based on the specific environmental conditions around certain factors comparison of the control variable measuring-point arrangement method,based on the test in advance,or combined with the results of numerical simulation of comprehensive arrangement of measuring points and the central station layout method based on lumped parameter method.This paper summarizes the human controllable factors and objective meteorological factors in the actual measurement,analyzes the radiation prevention measures in the actual measurement process,and puts forward Suggestions for improvement from the aspects of installation method and ventilation method.Secondly,the temperature expressivity indicator of the measured points are defined,the measured point temperature expressivity indicator is on behalf of a certain temperature range of one parameter,for the location of measuring points along the range of temperature gradient on the same contour surface,analysis the influence factors of the measured point expressivity indicator,and expressivity indicator for measuring point temperature measurement experiment,determine the subsequent simulation using horizontal resolution.Finally,public green space of residential landscape and greening road a numerical simulation of the thermal environment according to the result of simulation to calculate the measured point temperature expressivity,analysis of the measuring point temperature under different forms of expression,the change rule of the public green space in different plant species and planting density,and road landscape in different road material,the width and the influence of the greening form expression of the measured point temperature.The main conclusions are as follows:(1)different plant planting densities in the public green space have a greater impact on the temperature expressivity of the measuring point,and the temperature expressivity of the measuring point under the uniform planting mode is less than that of the single linear planting;(2)When the public green space is planted with the two plants common in Guangzhou,Ficus Microcarpa and Dracontomelon Duperreanum,when the planting density is 3 trees/100m~2,4 trees/100m~2and 5 trees/100m~2,the temperature expressivity of the measuring point is generally 7m-8m;(3)In the greening road,the material and width of the road have a significant influence on the temperature expressivity of the measuring point.When the greening forms of the road are Ficus Microcarpa plus Ivy Tree Bark,Ficus Microcarpa plus grass,and Ficus Microcarpa plus Ivy Tree Bark plus grass,the influence on the temperature expressivity of the measuring point is not significant.