路面反射率对室外热舒适度的提升效应研究

Study on Enhancement Effect of Pavement Reflectivity on Outdoor Thermal Comfort

摘要:

针对路面反射率对室外热舒适度的提升效应，其量化分析还不够清晰，采用透水/非透水下垫面的现场实测和ENVI-met数值模拟对比分析，研究发现：反射率与孔隙率存在一定相关性，反射率随孔隙率增大而减小；反射率在潮湿状态低于干燥状态，随着下垫面由潮湿变为干燥，其反射率也逐渐变大；透水混凝土下垫面因具有较低的反射率，可以有效改善室外热环境；多个优化因素组合，如低反射率＋潮湿状态＋树荫配置，使PMV值大致降低0.3，PET值大致降低2 ℃。研究成果对改善城市室外活动空间的环境质量，实现绿色低碳出行环境具有重要的现实意义。

Abstract:

Aiming at the enhancement effect of pavement reflectivity on the outdoor thermal comfort, its quantitative analysis is not clear. The field measurement and ENVI-met numerical simulation of permeable / non-permeable underlying surface are used for comparative analysis. The research finds that there is a certain correlation between reflectivity and porosity, and the reflectivity decreases with the increase of porosity. The reflectivity in the wet state is lower than that in the dry state, and the reflectivity gradually increases as the underlying surface changes from wet to dry. The underlying surface of permeable concrete can effectively improve the outdoor thermal environment because of its low reflectivity. The combination of multiple optimization factors, such as low reflectivity + damp conditions + tree shade configuration, will make the PMV value reduce by approximately 0.3 and the PET value reduce by approximately 2 ℃. The research result has the important practical significance for improving the environmental quality of urban outdoor activity space, and realizing the green and low-carbon travel environment.