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Article: Computer modeling of displacement ventilation systems based on plume rise in stratified environment

TitleComputer modeling of displacement ventilation systems based on plume rise in stratified environment
Authors
KeywordsDisplacement Ventilation
Displacement Zone Height
Plume
Temperature Gradient
Temperature Gradient Ratio
Issue Date2007
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuild
Citation
Energy And Buildings, 2007, v. 39 n. 4, p. 427-436 How to Cite?
AbstractA model for displacement ventilation system based on plume rise of single point heat source was developed. The errors for temperature gradient ratio were less than 6% in most cases. Errors for temperature gradient and displacement zone height were relatively higher (up to 28.1%) which might be due to the derivation of the parameters from experimental data. Still, the errors were lower than those from design model/method of some other workers (68.5% for the temperature gradient ratio and 15.7% for the temperature difference between the supply air and at 0.1 m above floor level). With a room height of 2.4 m (common for office in Hong Kong) and design room temperature 25.5 °C defined at 1.1 m above floor level under the normal load to air flow ratio of 12,000 W/m3/s (typical values for sub-tropical region) and minimum supply temperature of 18 °C, there existed a zone capacity range from 1000 to 5000 W that stand alone operation displacement ventilation system was feasible and that the displacement zone height (minimum 2.2 m) was above normal breathing level. The feasible zone capacity range diminished with decrease in design room temperature and/or room height. In this case, the load to air flow ratio had to be reduced, resulting in a higher flow rate when compared to a mixing ventilation system, or an auxiliary cooling facility such as a chilled ceiling had to be used. © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156876
ISSN
2015 Impact Factor: 2.973
2015 SCImago Journal Rankings: 2.073
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLee, CKen_US
dc.contributor.authorLam, HNen_US
dc.date.accessioned2012-08-08T08:44:23Z-
dc.date.available2012-08-08T08:44:23Z-
dc.date.issued2007en_US
dc.identifier.citationEnergy And Buildings, 2007, v. 39 n. 4, p. 427-436en_US
dc.identifier.issn0378-7788en_US
dc.identifier.urihttp://hdl.handle.net/10722/156876-
dc.description.abstractA model for displacement ventilation system based on plume rise of single point heat source was developed. The errors for temperature gradient ratio were less than 6% in most cases. Errors for temperature gradient and displacement zone height were relatively higher (up to 28.1%) which might be due to the derivation of the parameters from experimental data. Still, the errors were lower than those from design model/method of some other workers (68.5% for the temperature gradient ratio and 15.7% for the temperature difference between the supply air and at 0.1 m above floor level). With a room height of 2.4 m (common for office in Hong Kong) and design room temperature 25.5 °C defined at 1.1 m above floor level under the normal load to air flow ratio of 12,000 W/m3/s (typical values for sub-tropical region) and minimum supply temperature of 18 °C, there existed a zone capacity range from 1000 to 5000 W that stand alone operation displacement ventilation system was feasible and that the displacement zone height (minimum 2.2 m) was above normal breathing level. The feasible zone capacity range diminished with decrease in design room temperature and/or room height. In this case, the load to air flow ratio had to be reduced, resulting in a higher flow rate when compared to a mixing ventilation system, or an auxiliary cooling facility such as a chilled ceiling had to be used. © 2006 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuilden_US
dc.relation.ispartofEnergy and Buildingsen_US
dc.subjectDisplacement Ventilationen_US
dc.subjectDisplacement Zone Heighten_US
dc.subjectPlumeen_US
dc.subjectTemperature Gradienten_US
dc.subjectTemperature Gradient Ratioen_US
dc.titleComputer modeling of displacement ventilation systems based on plume rise in stratified environmenten_US
dc.typeArticleen_US
dc.identifier.emailLam, HN:hremlhn@hkucc.hku.hken_US
dc.identifier.authorityLam, HN=rp00132en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.enbuild.2006.08.007en_US
dc.identifier.scopuseid_2-s2.0-33846929350en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33846929350&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume39en_US
dc.identifier.issue4en_US
dc.identifier.spage427en_US
dc.identifier.epage436en_US
dc.identifier.isiWOS:000244971500005-
dc.publisher.placeSwitzerlanden_US
dc.identifier.scopusauthoridLee, CK=36882462000en_US
dc.identifier.scopusauthoridLam, HN=7202774923en_US

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