Effect of damper and heat source on wind catcher natural ventilation performance

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1、EnergyandBuildings38(2006)939–948www.elsevier.com/locate/enbuildEffectofdamperandheatsourceonwindcatchernaturalventilationperformanceAbbasAliElmualimInnovativeConstructionResearchCentre,SchoolofConstructionManagement&Engineering,TheUniversityofReading,ReadingRG66AW,UnitedKingdomReceived19Ma

2、y2005;receivedinrevisedform14October2005;accepted5November2005AbstractExperimentalwindtunnelandsmokevisualisationtestingandCFDmodellingwereconductedtoinvestigatetheeffectofairflowcontrolmechanismandheatsourceinsideroomsonwindcatchers/towersperformance.Forthispurpose,afull-scalewindcatcherwas

3、connectedtoatestroomandpositionedcentrallyinanopenboundarywindtunnel.Pressurecoefficients(Cp’s)aroundthewindcatcherandairflowintothetestroomwereestablished.Theperformanceofthewindcatcherdependsgreatlyonthewindspeedanddirection.Theincorporationofdampersandeggcrategrilleatceilinglevelreducesand

4、regulatestheairflowratewithanaveragepressurelosscoefficientof0.01.Theoperationofthewindcatcherinthepresenceofheatsourceswillpotentiallylowertheinternaltemperaturesinlinewiththeexternaltemperatures.#2005ElsevierB.V.Allrightsreserved.Keywords:Windcatcher;Ventilation;Visualisationtesting1.Introd

5、uctionoftakingairsuppliedatrooflevel,whichisoftencleanerthanairsuppliedatgroundlevel,particularlywherethebuildingisWindcatchers/towerssystemswereemployedinbuildingsadjacenttoaroadinurbanareas.ThewindcatchersystemsintheMiddleEastformanycenturiesandtheyareknownbycomeinvariousconfigurationstosu

6、itvariousbuildingtypeanddifferentnamesindifferentpartsoftheregion[1–3].Theywererequirementssuchastheincorporationofsolarpanel(solarconstructed,traditionally,fromwood-reinforcedmasonrywithchimney)andlightpipestobooststackeffect[12,13].Recently,openingsatheightabovethebuildingroofrangingfrom2

7、tothewindcatchersystemsareincreasinglybeinginstalledin20m.WithtallertowerscapturingwindsathigherspeedsandbuildingsaroundtheUK.Inmostofthesemoderninstallations,withlessdust[1,4,5].Theirapplicationinthehotaridregionofthewindcatchersterminateattheceilinglev