Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park
Regarding the significant impact of thermal comfort on users’ attendance in urban parks, there is an intense interest in studies on the outdoor thermal comfort in parks especially in regions with hot summers. This research examines the determinant factors of thermal environment and also strategies r...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484720302638 |
| _version_ | 1818385547989614592 |
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| author | Alireza Karimi Hanyieh Sanaieian Hamed Farhadi Saeid Norouzian-Maleki |
| author_facet | Alireza Karimi Hanyieh Sanaieian Hamed Farhadi Saeid Norouzian-Maleki |
| author_sort | Alireza Karimi |
| collection | DOAJ |
| description | Regarding the significant impact of thermal comfort on users’ attendance in urban parks, there is an intense interest in studies on the outdoor thermal comfort in parks especially in regions with hot summers. This research examines the determinant factors of thermal environment and also strategies related to albedo and greenery in a medium-scale park using ENVI-met software. In this regard, the environmental situation is analyzed using air (Ta) and surface temperature (Ts), wind speed (WS), sky view factor (SVF), the mean radiant temperature (MRT), and physiological equivalent temperature (PET). Subsequently, low- and high-albedo pavements, plane and pine trees, and Buxus shrubs strategies are investigated that can significantly influence the parameters. According to the results, SVF is not a precise indicator for determining radiation exposure and thermal comfort conditions despite its wide application in previous studies. Further, there is a significant correlation between SVF and PET only during sunlight and sunset. In addition, the best thermal comfort condition can be reached by combining the low-albedo pavements, and trees with wide crowns and high trunks. The crown height from the ground is an important factor due to its effect on the airflow that can also counteract the impact of slightly increased radiation. Field investigation and simulation studies reveal that the effect of albedo on thermal comfort is lower than the vegetation coverage. Nevertheless, the significant changes in albedo values and urban heat island mitigation do not have any considerable effect on thermal comfort improvement in urban parks. |
| first_indexed | 2024-12-14T03:39:54Z |
| format | Article |
| id | doaj.art-4cb12bcd82b3490d8cc333aeee3a9295 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-12-14T03:39:54Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-4cb12bcd82b3490d8cc333aeee3a92952022-12-21T23:18:30ZengElsevierEnergy Reports2352-48472020-11-01616701684Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban parkAlireza Karimi0Hanyieh Sanaieian1Hamed Farhadi2Saeid Norouzian-Maleki3Faculty of Art and Architecture, Islamic Azad University, South Tehran Branch, Iran; Building and Environment Research Laboratory, Iran University of Science and Technology, Tehran, IranSchool of Architecture and Environmental Design, Building and Environment Research Laboratory, Iran University of Science and Technology, Tehran, IranBuilding and Environment Research Laboratory, Iran University of Science and Technology, Tehran, IranDepartment of Landscape Architecture, Faculty of Architecture and Urban Planning, Shahid Beheshti University, 19839-69411, Tehran, Iran; Corresponding author.Regarding the significant impact of thermal comfort on users’ attendance in urban parks, there is an intense interest in studies on the outdoor thermal comfort in parks especially in regions with hot summers. This research examines the determinant factors of thermal environment and also strategies related to albedo and greenery in a medium-scale park using ENVI-met software. In this regard, the environmental situation is analyzed using air (Ta) and surface temperature (Ts), wind speed (WS), sky view factor (SVF), the mean radiant temperature (MRT), and physiological equivalent temperature (PET). Subsequently, low- and high-albedo pavements, plane and pine trees, and Buxus shrubs strategies are investigated that can significantly influence the parameters. According to the results, SVF is not a precise indicator for determining radiation exposure and thermal comfort conditions despite its wide application in previous studies. Further, there is a significant correlation between SVF and PET only during sunlight and sunset. In addition, the best thermal comfort condition can be reached by combining the low-albedo pavements, and trees with wide crowns and high trunks. The crown height from the ground is an important factor due to its effect on the airflow that can also counteract the impact of slightly increased radiation. Field investigation and simulation studies reveal that the effect of albedo on thermal comfort is lower than the vegetation coverage. Nevertheless, the significant changes in albedo values and urban heat island mitigation do not have any considerable effect on thermal comfort improvement in urban parks.http://www.sciencedirect.com/science/article/pii/S2352484720302638AlbedoENVI-metOutdoor thermal comfortUrban heat islandUrban parkVegetation species |
| spellingShingle | Alireza Karimi Hanyieh Sanaieian Hamed Farhadi Saeid Norouzian-Maleki Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park Energy Reports Albedo ENVI-met Outdoor thermal comfort Urban heat island Urban park Vegetation species |
| title | Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park |
| title_full | Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park |
| title_fullStr | Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park |
| title_full_unstemmed | Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park |
| title_short | Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park |
| title_sort | evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium sized urban park |
| topic | Albedo ENVI-met Outdoor thermal comfort Urban heat island Urban park Vegetation species |
| url | http://www.sciencedirect.com/science/article/pii/S2352484720302638 |
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