The effect of thermal performance of dominant materials used in building facades on thermal comfort conditions in urban areas of hot and dry climate

This study investigates the effect of facades on the changes in thermal comfort level in open urban spaces. Isfahan city is selected as a case study for warm climate. Brick, travertine, marble, ceramic, aluminum and granite with their own thermal properties were selected as covering materials of the vertical walls of urban valley buildings and data on air temperature, mean radiation temperature, relative humidity and wind velocity were extracted from Envi-met software. Using thermal comfort index of Riemann software, PET is calculated. The results of this study show that the change of the vertical wall-to-granite wall materials in the ratio of 0.5 and East-West facets reduced the air temperature to 1 to 1.1 ° C, 14.1 to 17.9 ° C mean radiation temperature and 8 to 8.3 ° C, respectively. Can be. The same change in materials ratio of 1 reduced the air temperature from 1.38 to 1.49 ° C, 16.45 to 20.92 ° C and 9.23 to 9.63 ° C, respectively. In addition, the use of granite instead of bricks in the aspect ratio of 2 reduces the air temperature to 1.35 to 1.36 ° C, the mean radiation temperature from 28.19 to 30.15 ° C and the PET index from 7.23 to 9.23 ° C. These divergences have also been calculated in the street with a north-south orientation. Finally, using regression method, it can be concluded that among the variables related to the material properties, the material release rate is the most effective material properties on PET index.