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Article: Pressure loss characteristics of thin single-blade flat dampers for square airflow branch ducts

TitlePressure loss characteristics of thin single-blade flat dampers for square airflow branch ducts
Authors
Issue Date2003
Citation
Hvac And R Research, 2003, v. 9 n. 3, p. 327-345 How to Cite?
AbstractThis paper describes an experimental study of the pressure loss characteristics of thin, single-blade flat dampers in square branch ducts in the turbulent region. The damper pressure loss characteristics and the interactions between the damper blade and shaft have been studied at various damper width ratios to take account of the damper leakage effects. At damper angles > 10 °, the damper pressure loss characteristics determined for damper -width ratios of 0.5 to 1.414 are found to be independent of the shaft sizes for typical rectangular and circular shafts with blockage area ratios ≤ 0.16. The damper pressure loss coefficients are observed to have collapsed onto a single curve within a ±10% accuracy for damper width ratios of 0.9 to 1.414. By applying this relationship to square, flat airtight dampers in square branch ducts, the desired flow characteristics for branch ducts fitted with proportional damper controller-actuators can be achieved within a maximum deviation of ±10%. This helps solve the nonlinearity problem in the installed damper characteristics for large, complex, variable air volume systems having branch ducts with different resistances. Using a graphical approach, the required tuning parameter values for square, single-blade airtight dampers have also been determined for use by control system designers.
Persistent Identifierhttp://hdl.handle.net/10722/156676
ISSN
2015 Impact Factor: 0.871
References

 

DC FieldValueLanguage
dc.contributor.authorHung, CYSen_US
dc.contributor.authorLam, HNen_US
dc.date.accessioned2012-08-08T08:43:29Z-
dc.date.available2012-08-08T08:43:29Z-
dc.date.issued2003en_US
dc.identifier.citationHvac And R Research, 2003, v. 9 n. 3, p. 327-345en_US
dc.identifier.issn1078-9669en_US
dc.identifier.urihttp://hdl.handle.net/10722/156676-
dc.description.abstractThis paper describes an experimental study of the pressure loss characteristics of thin, single-blade flat dampers in square branch ducts in the turbulent region. The damper pressure loss characteristics and the interactions between the damper blade and shaft have been studied at various damper width ratios to take account of the damper leakage effects. At damper angles > 10 °, the damper pressure loss characteristics determined for damper -width ratios of 0.5 to 1.414 are found to be independent of the shaft sizes for typical rectangular and circular shafts with blockage area ratios ≤ 0.16. The damper pressure loss coefficients are observed to have collapsed onto a single curve within a ±10% accuracy for damper width ratios of 0.9 to 1.414. By applying this relationship to square, flat airtight dampers in square branch ducts, the desired flow characteristics for branch ducts fitted with proportional damper controller-actuators can be achieved within a maximum deviation of ±10%. This helps solve the nonlinearity problem in the installed damper characteristics for large, complex, variable air volume systems having branch ducts with different resistances. Using a graphical approach, the required tuning parameter values for square, single-blade airtight dampers have also been determined for use by control system designers.en_US
dc.languageengen_US
dc.relation.ispartofHVAC and R Researchen_US
dc.titlePressure loss characteristics of thin single-blade flat dampers for square airflow branch ductsen_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.scopuseid_2-s2.0-0041308041en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0041308041&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume9en_US
dc.identifier.issue3en_US
dc.identifier.spage327en_US
dc.identifier.epage345en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridHung, CYS=7403166405en_US
dc.identifier.scopusauthoridLam, HN=7202774923en_US

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