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Wind Conditions and Ventilation in high rise long Street Models
University of Hong Kong.
University of Hong Kong.
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Byggvetenskap - installationsteknik. (Inomhusmiljö)
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, BMG Labbet.
2010 (engelsk)Inngår i: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 45, nr 6, s. 1353-1365Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We regarded high-rise cities as obstacles and channels to wind. We first studied wind conditions and ventilations in idealized high-rise long street models experimentally and numerically with a constant street width (W = 30 mm), variable street heights (H = 2 W, 2.5W, 3W, 4W), variable street lengths (L = 47.4W, 79W. 333W, 667W) and a parallel approaching wind. The flow rates penetrating into windward entries are a little larger than the reference flow rate in the far upstream free flow through the same area with windward entries in all models. The stream-wise velocity decreases along the street as some air leaves upwardly across street roofs. Near the leeward entry, there is a downward flow which brings some air into the street and results in an accelerating process. In the neighborhood scale long streets (L = 47.4W and 79W), wind in taller streets is stronger and the ventilation is better than a lower one. For the city scale long streets (L = 333W and 667W), a constant flow region exists where the vertical velocity is zero and the stream-wise velocity remains constant. In such regions, turbulent fluctuations across the street roof are more important to air exchange than vertical mean flows. In a taller street, the process to establish the constant flow conditions is longer and the normalized balanced horizontal flow rate is smaller than those in a lower street. In the city scale long streets, the turbulence exchange rate can be 5-10 times greater than the mean flow rate. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

sted, utgiver, år, opplag, sider
2010. Vol. 45, nr 6, s. 1353-1365
Emneord [en]
Urban ventilation
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-10116DOI: 10.1016/j.buildenv.2009.11.019ISI: 000275515400001Scopus ID: 2-s2.0-75949084439OAI: oai:DiVA.org:hig-10116DiVA, id: diva2:441128
Tilgjengelig fra: 2011-09-14 Laget: 2011-09-14 Sist oppdatert: 2018-12-03bibliografisk kontrollert

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