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http://dx.doi.org/10.13087/kosert.2021.24.6.109

The effect of Temperature Reduction of Green Roof using Rainwater Storage Tank  

Yun, Seok-Hwan (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University)
Kim, Eun-Sub (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University)
Piao, Zheng-Gang (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
Jeon, Yoon-Ho (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
Kang, Hye-Won (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
Kim, Sang-Hyuck (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
Kim, Ji-Yeon (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University)
Kang, Han-Min (Korea institute of green infrastructure)
Ham, Eun-Kyung (Korea institute of green infrastructure)
Lee, Dong-Kun (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Environmental Restoration Technology / v.24, no.6, 2021 , pp. 109-119 More about this Journal
Abstract
Thermal environment of city is getting worse due to severe urban heat island caused by climate change and urbanization. Green roof improves the urban thermal environment and save the cooling energy in buildings. This study presented a green roof combined with a storage system that stores rain-water and supplies water through a wick and evaluated the temperature reduction effect as surface temperature and amount of evapotranspiration. For about a week, the surface temperature using a infrared thermal imager and the evapotranspiration by recording change of module weight were measured at intervals of 30 minutes from sunrise to sunset. The results show that the mean surface temperature of the green roof was 15.4 degrees lower than that of the non-green roof from 12:00 P.M. to 14:00 P.M. There was no significant difference between mean surface temperature of green roof with and without storage system immediately after rain, but more than a week after rain, there was a difference with average of 2.49 degrees and maximum of 4.72 degrees. The difference in daily amount of evapotranspiration was measured to be 1.66 times on average. As drought stress increased over time, the difference in daily amount of evapotranspiration and surface temperature between with/without storage system increased simultaneously. The results of the study show a more excellent cooling effect of green roof combined with the rainwater storage system.
Keywords
Urban heat island; Surface temperature; latent heat; Cooling effect; Evapotranspiration; Sponge city;
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