Document Type : Original Article
School of Architecture and Environmental Design, Iran University of Science and Technology
As an alternative technique, considering microclimates in cities could be guideline to proper natural ventilation (NV) systems for better indoor thermal conditions in buildings. During the warm seasons, spatially in a hot and arid climate, cross ventilation is highly applicable for improving indoor thermal comfort. Solar chimney (SC) systems enhance NV through buildings via buoyancy forces as an alternative for improving comfortable conditions. In this study, two high-rise buildings in two different microclimates (Artesh highway and Mojahedin Eslam Street) in Tehran city are chosen that both use cross ventilation as a passive strategy. Also, the LEED survey is used to assess how much occupants are satisfied with indoor thermal comfort. The field experiment was carried out in the fourth story of each building to investigate the impact of cross ventilation on indoor air temperature and wind velocity. Additionally, CFD method is employed to simulate cross ventilation and SC in buildings. The results show that SC can decrease about 2 ˚C of room temperature by boosting NV which improves the thermal comfort zone inside the houses. according to the survey, 23.1% and 7.5% of residents are respectively dissatisfied with the non-response of the cooling system and the stillness of the air, so the use of SC can significantly increase indoor thermal comfort zone and residents’ satisfaction.