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Article: Thermal conditions and ventilation in an ideal city model of Hong Kong

TitleThermal conditions and ventilation in an ideal city model of Hong Kong
Authors
KeywordsCity ventilation
Thermal buoyancy
Thermal stratification
Urban thermal environment
Issue Date2011
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuild
Citation
Energy And Buildings, 2011, v. 43 n. 5, p. 1139-1148 How to Cite?
AbstractUrban heat island can significantly increase the demand for cooling of buildings in cities. This paper investigates one of the main causes of the urban heat island phenomenon, i.e. reduced city ventilation. Two simple Hong Kong city models with relatively complex terrain were considered here under different atmospheric conditions. A 3D RNG k-ε turbulence model was used for modeling turbulence effects. The simulation results showed that the influence of thermal stratification can be significant on city ventilation driven partially by thermal buoyancy. When the wind speed is relatively large, the impact of thermal stratification on air flow in city street canyons is minor. When the wind speed is small relative to the buoyancy force, the airflow in the street canyons is dependent on thermal stratification. When there is an adverse vertical temperature gradient, the greater the instability, the stronger the vertical mixing and the greater the flow rate caused by turbulence. The heat and pollutants can easily accumulate under stable atmospheric conditions when there is only a weak background wind or none at all. © 2010 Elsevier B.V. All rights reserved.
DescriptionTackling building energy consumption challenges - Special Issue of ISHVAC 2009, Nanjing, China
Persistent Identifierhttp://hdl.handle.net/10722/124073
ISSN
2015 Impact Factor: 2.973
2015 SCImago Journal Rankings: 2.073
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYang, Len_HK
dc.contributor.authorLi, Yen_HK
dc.date.accessioned2010-10-20T04:32:14Z-
dc.date.available2010-10-20T04:32:14Z-
dc.date.issued2011en_HK
dc.identifier.citationEnergy And Buildings, 2011, v. 43 n. 5, p. 1139-1148en_HK
dc.identifier.issn0378-7788en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124073-
dc.descriptionTackling building energy consumption challenges - Special Issue of ISHVAC 2009, Nanjing, China-
dc.description.abstractUrban heat island can significantly increase the demand for cooling of buildings in cities. This paper investigates one of the main causes of the urban heat island phenomenon, i.e. reduced city ventilation. Two simple Hong Kong city models with relatively complex terrain were considered here under different atmospheric conditions. A 3D RNG k-ε turbulence model was used for modeling turbulence effects. The simulation results showed that the influence of thermal stratification can be significant on city ventilation driven partially by thermal buoyancy. When the wind speed is relatively large, the impact of thermal stratification on air flow in city street canyons is minor. When the wind speed is small relative to the buoyancy force, the airflow in the street canyons is dependent on thermal stratification. When there is an adverse vertical temperature gradient, the greater the instability, the stronger the vertical mixing and the greater the flow rate caused by turbulence. The heat and pollutants can easily accumulate under stable atmospheric conditions when there is only a weak background wind or none at all. © 2010 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuilden_HK
dc.relation.ispartofEnergy and Buildingsen_HK
dc.subjectCity ventilationen_HK
dc.subjectThermal buoyancyen_HK
dc.subjectThermal stratificationen_HK
dc.subjectUrban thermal environmenten_HK
dc.titleThermal conditions and ventilation in an ideal city model of Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0378-7788&volume=&spage=In Press, Corrected Proof&epage=&date=2010&atitle=Thermal+conditions+and+ventilation+in+an+ideal+city+model+of+Hong+Kong-
dc.identifier.emailLi, Y:liyg@hkucc.hku.hken_HK
dc.identifier.authorityLi, Y=rp00151en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.enbuild.2010.06.005en_HK
dc.identifier.scopuseid_2-s2.0-79953027578en_HK
dc.identifier.hkuros172735-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79953027578&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1139en_HK
dc.identifier.epage1148en_HK
dc.identifier.isiWOS:000290012800013-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridYang, L=13806737800en_HK
dc.identifier.scopusauthoridLi, Y=7502094052en_HK
dc.identifier.citeulike7405387-

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