ENVI-met Simulation of Summer Thermal Environment and Thermal Comfort Changes in Guangzhou Urban Blocks
LI Haiyan
SUN Jiaren
LI Jiangbo
PAN Weijuan
WU Xiaoxuan
ZHAI Zhihong
Abstract：Based on the ENVI-met microclimate numerical model,this study simulated and analyzed the thermal environment and comfort responses within Guangzhou urban blocks during periods of high temperature in summer.The results showed that the model accurately reproduced the daily variations in regional temperature and humidity,with root mean square errors of 0.99 ℃ and 6.1％,respectively.The green coverage of the underlying surface within the study area significantly impacted the temperature at pedestrian height.The temperature of local heat island in the hardened ground area of meteorological observation field was close to 38 ℃,while areas shaded by buildings and vegetation experienced localized cooling.Extremely hot areas(with a physiological equivalent temperature exceeding 41 ℃)accounted for 66.82％of the study area,primarily observed at hardened ground.In the absence of vegetation,the overall temperature within the study area increased,with the average regional temperature rising by 2.0 ℃,the high-temperature area expanding by 34.4％,and the cooling effect of vegetation extending up to 13 m vertically.The maximum wind speed increase was 1.0 m·s-1,the area with higher mean radiant temperature(MRT,MRT＞58 ℃)expanded by 36.96％,and the extremely hot areas increased by 23.13％.Therefore,a favorable wind environment,effective use of shade,and well-planned greenery may help optimize outdoor thermal comfort within urban blocks.
Keywords：Guangzhou modelGuangzhou urban streetsthermal environmentthermal comfort
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 55-65 )