On the heating environment in street canyon |
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Authors: | Rizwan Ahmed Memon D Y C Leung |
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Institution: | 1.Department of Mechanical Engineering,Mehran University of Engineering & Technology,Jamshoro, Sindh,Pakistan;2.Department of Mechanical Engineering,University of Hong Kong,Pokfulam,Hong Kong |
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Abstract: | This study investigates the impact of building aspect ratio (building-height-to-street-canyon-width-ratio), wind speed and
surface and air-temperature difference (Δθs−a) on the heating environment within street canyon. The Reynolds-averaged Navier-Stokes (RANS) and energy transport equations
were solved with Renormalization group (RNG) theory version of k-e{\varepsilon} turbulence model. The validation process demonstrated that the model could be trusted for simulating air-temperature and
velocity trends. The temperature and velocity patterns were discussed in idealized street canyons of different aspect ratios
(0.5–2.0) with varying ambient wind speeds (0.5–1.5 m/s) and Δθs−a (2–8 K). Results show that air-temperatures are directly proportional to bulk Richardson number (R
b
) for all but ground heating situation. Conversely, air-temperatures increase significantly across the street canyon with
a decrease in ambient wind speed; however, the impact of Δθs−a was negligible. Clearly, ambient wind speed decreases significantly as it passes over higher AR street canyons. Notably,
air-temperatures were the highest when the windward wall was heated and the least during ground heating. Conversely, air-temperatures
were lower along the windward side but higher within the street canyon when the windward wall was heated. |
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