Effects of street orientation and tree species thermal comfort within urban canyons in a hot,dry climate |
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| Institution: | 1. Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran;3. Department of Landscape and Architecture, Texas A&M University, College Station, TX, United States;1. College of Architecture and Art, Hefei University of Technology,Hefei 230601, China;2. School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture, Beijing 106216, China;3. School of Architecture and Urban Planning, Anhui Jianzhu University, Hefei 230601, China;1. School of Atmospheric Sciences, Sun Yat-sen University and Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Zhuhai, China;2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China;3. Guangdong Provincial Field Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Guangzhou, China;4. Department of Architecture, National University of Singapore, Singapore;5. Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Israel |
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| Abstract: | Urban valleys as a primary element of the urban environment have played an undeniable role in the intensification of urban heat islands as climate change has increased in the past century. However, appropriate solutions can help improve outdoor thermal comfort (OTC) in these areas. In the present study, parameters related to thermal comfort outdoors such as air temperature (Ta), wind speed (Ws), sky view factor (SVF), mean radiant temperature (MRT) and physiological equivalent temperature (PET) in an urban street were analyzed using ENVI-met simulation. Furthermore, the influence of tree species and street orientation in the study area was also examined to improve thermal comfort conditions. Similarly, with field measurements on site, a questionnaire was used to determine the OTC range of visitors to the urban valley. The study also integrates with ENVI-met microclimatic modeling to improve thermal comfort in the urban street canyon, which was used to simulate the current situation and validated with field measurements, showing a good correlation. The results have revealed that, although SVF has been extensively used in previous studies, it is not an exact indicator to determine the amount of radiation and OTC conditions. The simulation study expressed that orientations' effect on thermal comfort is less prominent than tree cover. However, significant changes in orientation have a remarkable effect on improving OTC in the urban valley. |
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