2017 Volume 11 Issue 9
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YU Xiaohui, YANG Yajun, TAN Shenglin, LI Ruili, QIN Huapeng, QIU Guoyu. Evapotranspiration and its cooling effect of urban green roof[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5333-5340. doi: 10.12030/j.cjee.201612039
Citation: YU Xiaohui, YANG Yajun, TAN Shenglin, LI Ruili, QIN Huapeng, QIU Guoyu. Evapotranspiration and its cooling effect of urban green roof[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5333-5340. doi: 10.12030/j.cjee.201612039
shu

Evapotranspiration and its cooling effect of urban green roof

  • 1.

    School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China

  • Received Date: 15/01/2017
    Accepted Date: 07/12/2016
    Available Online: 26/08/2017
    Fund Project:
  • Green roof has an obvious cooling effect due to its evapotranspiration (ET). However, quantitative estimation of its ET is still a challenge, which in turn limits the research on the cooling mechanism of green roof and its wide applications. The objectives of this study, therefore, are to use the approach of infrared remote sensing+three-temperatures model to investigate the ET of green roof and its cooling effect in Shenzhen. Results showed that the daily ET decreased during four days after a rain of 40.15 mm, which were 1.95, 1.91, 1.66 and 1.55 mm·d-1, respectively. Correspondingly, daily average green roof surface temperature gradually increased, which were 21.62, 22.50,23.67 and 24.74℃, respectively. The differences of surface temperature between green roof and reference leaf also decreased gradually, which were 9.08, 8.66, 7.97 and 7.38℃, respectively. The cooling effect (1 000 m3 air column) gradually decreased, which were 1.82, 1.79, 1.17 and 1.10℃, respectively. These results indicated that ET can significantly reduce the temperature of roof and ambient air. On clear days, daytime ET rates of green roof were 0.04 to 0.54 mm·h-1 in summer and 0.03 to 0.09 mm·h-1 in winter. The temperature differences between green roof and cement roof were 9.94℃ in summer and 9.35℃ in winter. The temperature differences between green roof and marble roof were 4.54℃ in summer and 4.35℃ in winter. Green roof had a significant effect on reducing roof surface temperature. In summer, the daily surface temperature variation range were 10.3℃ (green roof), 14.80℃ (marble roof) and 20.70℃ (cement roof), which indicated that green roof can effectively reduce the volatility of roof temperature.
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Evapotranspiration and its cooling effect of urban green roof

  • Received Date: 15/01/2017
  • Accepted Date: 07/12/2016
  • Available Online: 26/08/2017
Fund Project:

Abstract: Green roof has an obvious cooling effect due to its evapotranspiration (ET). However, quantitative estimation of its ET is still a challenge, which in turn limits the research on the cooling mechanism of green roof and its wide applications. The objectives of this study, therefore, are to use the approach of infrared remote sensing+three-temperatures model to investigate the ET of green roof and its cooling effect in Shenzhen. Results showed that the daily ET decreased during four days after a rain of 40.15 mm, which were 1.95, 1.91, 1.66 and 1.55 mm·d-1, respectively. Correspondingly, daily average green roof surface temperature gradually increased, which were 21.62, 22.50,23.67 and 24.74℃, respectively. The differences of surface temperature between green roof and reference leaf also decreased gradually, which were 9.08, 8.66, 7.97 and 7.38℃, respectively. The cooling effect (1 000 m3 air column) gradually decreased, which were 1.82, 1.79, 1.17 and 1.10℃, respectively. These results indicated that ET can significantly reduce the temperature of roof and ambient air. On clear days, daytime ET rates of green roof were 0.04 to 0.54 mm·h-1 in summer and 0.03 to 0.09 mm·h-1 in winter. The temperature differences between green roof and cement roof were 9.94℃ in summer and 9.35℃ in winter. The temperature differences between green roof and marble roof were 4.54℃ in summer and 4.35℃ in winter. Green roof had a significant effect on reducing roof surface temperature. In summer, the daily surface temperature variation range were 10.3℃ (green roof), 14.80℃ (marble roof) and 20.70℃ (cement roof), which indicated that green roof can effectively reduce the volatility of roof temperature.

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