Investigation of PPD index in thermal comfort of urban open spaces in Summer , case study: sidewalk river side Khorramabad

Nowadays, the issue of thermal comfort has been raised as one of the important factors in the quality of urban spaces along with physical factors. In fact, the quality of urban spaces is important for the use of citizens and should be considered. However, due to the impact of various parameters in urban open spaces that affect the thermal comfort of users and the lack of codified principles in this field has made it difficult for designers to identify and meet the climatic needs in an urban area. The present study, considering the discussion of thermal comfort in urban sidewalks, investigates climatic and environmental factors in the area in which the city of Khorramabad is located in the vicinity of the castle of the celestial sphere, and through the application of computer simulation technique ( Envi met software (examines the thermal comfort index (PPD predicted percentage of dissatisfaction) which is one of the important indicators in this field in different parts of the designed sidewalk and the results are concluded that factors such as choosing the direction of the sidewalk Walking time, sidewalk width, the presence of trees, shade and water as well as some user characteristics such as metabolic rate, activity rate, coverage rate have affected the amount of thermal comfort.