Microclimatic modeling of the urban thermal environment of Singapore to mitigate urban heat island
Priyadarsini, R. Hien, W.N. Wai David, C.K.
Priyadarsini, R.
Wai David, C.K.
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Abstract
This study investigates the urban heat island effect in Singapore and examines the key factors causing this effect. The possibilities of improving heat extraction rate by optimizing air flow in selected hot spots were explored. The effect of building geometry, façade materials and the location of air-conditioning condensers on the outdoor air temperature was explored using computational fluid dynamics (CFD) simulations. It was found that at very low wind speeds, the effect of façade materials and their colours was very significant and the temperature at the middle of a narrow canyon increased up to 2.5 °C with the façade material having lower albedo. It was also found that strategically placing a few high-rise towers will enhance the air flow inside the canyon thereby reducing the air temperature. Adopting an optimum H/W ratio for the canyons increased the velocity by up to 35% and reduced the corresponding temperature by up to 0.7 °C. © 2008 Elsevier Ltd. All rights reserved.
Keywords
CFD, Façade materials, Geometry, Temperature, Urban heat island, Velocity
Source Title
Solar Energy
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Series/Report No.
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Date
2008
DOI
10.1016/j.solener.2008.02.008
Type
Article