Document Type : Original Article
Author
Assistant Professor, Department of Architecture, Ilam Branch, Islamic Azad University, Ilam, Iran.
Abstract
This study compares the effect of trees on the thermal comfort of pedestrians in urban streets with and without trees. This study used a survey and field method to investigate the effect of removing old trees and vegetation (boxwood, grass, and flowering shrubs) on the thermal comfort of pedestrians in four streets of Ilam. The statistical population consisted of 384 people (96 people per street) who were selected by simple random sampling. Data were collected using the American ASHRAE-55 standard questionnaire for subjective assessment of thermal comfort and MIC98586 data logger tools for recording climatic variables, Fluke 975 Air Meter for recording CO₂ concentration values, and TES1326 laser thermometer for recording skin surface temperature. Then, the data were analyzed using Pearson correlation and multivariate linear regression in SPSS27 software to examine the relationship between climatic variables and thermal comfort. The findings showed that the mean and standard deviation of the thermal comfort status of pedestrians for the treeless streets of Taleghani and Samandari are 0.52 ± 0.049 and 1.67 ± 0.745, respectively, and for the tree-lined streets of Pasdaran West and Pasdaran East-Middle, they are 1.43 ± 0.125 and 1.54 ± 0.325, respectively. The results showed that the presence of vegetation and trees in the walls of urban streets, due to their stable environmental reactivity, plays an important role in reducing the thermal crisis and the city's thermal island and preventing changes in thermal comfort status in urban microclimates.
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