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A Numerical Study of the Temperature Reduction by Water Spray Systems within Urban Street Canyons

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  • Ying-Chen Lee

    (Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan)

  • Tsang-Jung Chang

    (Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan)

  • Cheng-I Hsieh

    (Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan)

Abstract

To reduce energy demand (both fossil fuel and renewable energy) for cooling the urban heat island environment, some solutions have been studied. Among these methods, the water spray system is considered more flexible due to its dynamic controls. This study investigated the cooling effect of water spray systems in the street canyon under different aspect ratios and high relative humidity environments using a computational fluid dynamics model. This model was validated with water channel and wind tunnel experiments. The results showed that the most effective cooling area was the area just under the spray nozzles. However, in a narrow street canyon, people in the middle of the street may feel the cooling effect because of the dispersion and accumulation of the cooled air. Our simulations demonstrated that air under the nozzles was saturated and this revealed that under drier conditions the water spray systems will have higher cooling performance. We also found that using large water droplets created a wider cooling area in the middle of the street canyon, and this phenomenon was not changed much if the nozzle height was increased from 2.5 m to 3.5 m.

Suggested Citation

  • Ying-Chen Lee & Tsang-Jung Chang & Cheng-I Hsieh, 2018. "A Numerical Study of the Temperature Reduction by Water Spray Systems within Urban Street Canyons," Sustainability, MDPI, vol. 10(4), pages 1-28, April.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:4:p:1190-:d:141151
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    References listed on IDEAS

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    1. Isaac, Morna & van Vuuren, Detlef P., 2009. "Modeling global residential sector energy demand for heating and air conditioning in the context of climate change," Energy Policy, Elsevier, vol. 37(2), pages 507-521, February.
    2. Runsheng, Tang & Etzion, Y. & Erell, E., 2003. "Experimental studies on a novel roof pond configuration for the cooling of buildings," Renewable Energy, Elsevier, vol. 28(10), pages 1513-1522.
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    Cited by:

    1. Xiaodong Xu & Xinhan Xu & Peng Guan & Yu Ren & Wei Wang & Ning Xu, 2018. "The Cause and Evolution of Urban Street Vitality under the Time Dimension: Nine Cases of Streets in Nanjing City, China," Sustainability, MDPI, vol. 10(8), pages 1-19, August.
    2. Chih-Chun Kung & Bruce A. McCarl, 2018. "Sustainable Energy Development under Climate Change," Sustainability, MDPI, vol. 10(9), pages 1-4, September.
    3. Jingming Qian & Shujiang Miao & Nigel Tapper & Jianguang Xie & Greg Ingleton, 2020. "Investigation on Airport Landscape Cooling Associated with Irrigation: A Case Study of Adelaide Airport, Australia," Sustainability, MDPI, vol. 12(19), pages 1-16, October.

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