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

Ying-Chen Lee, Tsang-Jung Chang and Cheng-I Hsieh
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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

Sustainability, 2018, vol. 10, issue 4, 1-28

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.

Keywords: urban street canyon; water spray system; thermal comfort simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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