Next Article in Journal
The Total Economic Value of Sport Tourism in Belt and Road Development—An Environmental Perspective
Next Article in Special Issue
Security-Constrained Unit Commitment Considering Differentiated Regional Air Pollutant Intensity
Previous Article in Journal
Identifying Habitat Type Conservation Priorities under the Habitats Directive: Application to Two Italian Biogeographical Regions
Previous Article in Special Issue
Improving Design Performance by Alliance between Contractors and Designers in International Hydropower EPC Projects from the Perspective of Chinese Construction Companies
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Sustainability 2018, 10(4), 1190; https://doi.org/10.3390/su10041190

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

Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan
*
Author to whom correspondence should be addressed.
Received: 24 February 2018 / Revised: 10 April 2018 / Accepted: 11 April 2018 / Published: 15 April 2018
(This article belongs to the Special Issue Sustainable Energy Development under Climate Change)
  |  
PDF [48198 KB, uploaded 3 May 2018]
  |  

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. View Full-Text
Keywords: urban street canyon; water spray system; thermal comfort simulation urban street canyon; water spray system; thermal comfort simulation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Lee, Y.-C.; Chang, T.-J.; Hsieh, C.-I. A Numerical Study of the Temperature Reduction by Water Spray Systems within Urban Street Canyons. Sustainability 2018, 10, 1190.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top