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Article: Effects of building aspect ratio and wind speed on air temperatures in urban-like street canyons

TitleEffects of building aspect ratio and wind speed on air temperatures in urban-like street canyons
Authors
KeywordsAspect Ratio
Numerical Modeling
Street Canyon
Urban Heating
Wind Speed
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building and Environment, 2010, v. 45 n. 1, p. 176-188 How to Cite?
AbstractThe objective of this study is to simulate the characteristic role of building aspect ratio (AR) and wind speed on air temperatures during different street canyon heating situations. A two-dimensional Renormalization Group (RNG) k-ε turbulence model is employed to solve the Reynolds-averaged Navier-Stokes (RANS) and energy transport equations. A comparison of the results from the adopted model with those reported by similar experimental and numerical works demonstrated that the model is quite reliable when simulating temperature and wind profiles. The model is employed to predict air temperatures in idealized street canyons of aspect ratios (building-height-to-street-width ratio) of 0.5-8 with ambient wind speeds of 0.5-4 m/s. Three situations were identified for simulating diurnal heating of street canyon. It is noted that air temperatures are positively correlated with the bulk Richardson number (Rb) in most of the cases. The results show that the air temperature difference between high and low AR street canyon (ΔθAR) was the highest during the nighttime (i.e., around 7.5 K between AR8 and AR0.5), but low or even negative during the daytime. It is also found that air temperatures rose as high as 1.3 K when ambient wind speed decreased from 4 m/s to 0.5 m/s. It is also revealed that the ΔθAR during different diurnal situations and the nighttime and daytime air temperature difference between urban and rural areas (Urban Heat Island, UHI) closely resemble one another. Conclusively, the results of this study have highlighted the importance of street canyon AR and wind speed on urban heating. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/157026
ISSN
2015 Impact Factor: 3.394
2015 SCImago Journal Rankings: 2.121
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMemon, RAen_US
dc.contributor.authorLeung, DYCen_US
dc.contributor.authorLiu, CHen_US
dc.date.accessioned2012-08-08T08:45:00Z-
dc.date.available2012-08-08T08:45:00Z-
dc.date.issued2010en_US
dc.identifier.citationBuilding and Environment, 2010, v. 45 n. 1, p. 176-188en_US
dc.identifier.issn0360-1323en_US
dc.identifier.urihttp://hdl.handle.net/10722/157026-
dc.description.abstractThe objective of this study is to simulate the characteristic role of building aspect ratio (AR) and wind speed on air temperatures during different street canyon heating situations. A two-dimensional Renormalization Group (RNG) k-ε turbulence model is employed to solve the Reynolds-averaged Navier-Stokes (RANS) and energy transport equations. A comparison of the results from the adopted model with those reported by similar experimental and numerical works demonstrated that the model is quite reliable when simulating temperature and wind profiles. The model is employed to predict air temperatures in idealized street canyons of aspect ratios (building-height-to-street-width ratio) of 0.5-8 with ambient wind speeds of 0.5-4 m/s. Three situations were identified for simulating diurnal heating of street canyon. It is noted that air temperatures are positively correlated with the bulk Richardson number (Rb) in most of the cases. The results show that the air temperature difference between high and low AR street canyon (ΔθAR) was the highest during the nighttime (i.e., around 7.5 K between AR8 and AR0.5), but low or even negative during the daytime. It is also found that air temperatures rose as high as 1.3 K when ambient wind speed decreased from 4 m/s to 0.5 m/s. It is also revealed that the ΔθAR during different diurnal situations and the nighttime and daytime air temperature difference between urban and rural areas (Urban Heat Island, UHI) closely resemble one another. Conclusively, the results of this study have highlighted the importance of street canyon AR and wind speed on urban heating. © 2009 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenven_US
dc.relation.ispartofBuilding and Environmenten_US
dc.subjectAspect Ratioen_US
dc.subjectNumerical Modelingen_US
dc.subjectStreet Canyonen_US
dc.subjectUrban Heatingen_US
dc.subjectWind Speeden_US
dc.titleEffects of building aspect ratio and wind speed on air temperatures in urban-like street canyonsen_US
dc.typeArticleen_US
dc.identifier.emailLeung, DYC: ycleung@hku.hken_US
dc.identifier.emailLiu, CH: chliu@hkucc.hku.hken_US
dc.identifier.authorityLeung, DYC=rp00149en_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.buildenv.2009.05.015en_US
dc.identifier.scopuseid_2-s2.0-70249151012en_US
dc.identifier.hkuros157268-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70249151012&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume45en_US
dc.identifier.issue1en_US
dc.identifier.spage176en_US
dc.identifier.epage188en_US
dc.identifier.isiWOS:000271350500023-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridMemon, RA=26656757300en_US
dc.identifier.scopusauthoridLeung, DYC=7203002484en_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.citeulike5352313-

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