Computational analysis of reduced-mixing personal ventilation jets

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1、BuildingandEnvironment44(2009)1559–1567ContentslistsavailableatScienceDirectBuildingandEnvironmentjournalhomepage:www.elsevier.com/locate/buildenvComputationalanalysisofreduced-mixingpersonalventilationjetsJackieS.Russo,ThongQ.Dang,H.EzzatKhalifa*SyracuseUniversity,Syracuse,NY,U

2、SAarticleinfoabstractArticlehistory:Inthispaperwedevelopadetailedcomputationalfluiddynamics(CFD)modelofapersonalventilationReceived10August2008(PV)setupcomprisingaPVnozzle,seatedthermalmanikinandfloordiffuser,thenuseexperimentalReceivedinrevisedformvelocityandtracergasconcentratio

3、ndataforthesamesetuptovalidatetheCFDmodel.Specifically,we8November2008compareCFDresultswiththeexperimentalresultsobtainedwithbothaconventionalroundnozzleandAccepted11November2008anovellow-mixingco-flownozzledirectingaPVfreshairjettowardthebreathingzone(BZ)ofaseatedthermalmanikinin

4、athermallycontrolledchamberventilatedalsobyafloordiffuserbehindtheKeywords:manikin.TheCFDmodelshowsexcellentagreementwiththeexperimentaldata.WethenexercisetheAirqualityCFDmodeltostudytheeffectofnozzleexitboundaryconditionssuchasturbulenceintensityandlengthVentilationPersonalizedv

5、entilationscale,flowrateandtemperature,andmanikintemperatureontheairqualityintheBZoftheheatedmanikin.ItisshownthattheairqualityofthenovelPVsystemissensitivetothenozzleexitturbulenceintensityandflowrate,andinsensitivetojettemperaturewithinthe20–26Crange,andtobodytemperaturewithina

6、clorangeof0–1.AcompanionpaperpresentsindetailtheexperimentalsetupandresultsusedtovalidatetheCFDmodeldiscussedinthispaper.Ó2008ElsevierLtd.Allrightsreserved.1.Introductiondesignandplacementofnovelenergy-efficientPVsystemsthatareaimedatachievinghighBZairqualitywithonlyasmallfractio

7、nofThequalityoftheairinthebreathingzone(BZ)ofapersonthefreshairindicatedbyANSI/ASHRAEStandard62.1-2004[16].receivingfreshairthroughadirectedpersonalizedventilation(PV)Inthispaperwepresentadetailed,high-fidelityCFDmodelofjetisstronglyaffectedbyturbulententrainmentofthesurroundinga

8、PVset-upandcompareitsresultswithexperimentaldat