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1、EnergyandBuildings38(2006)534–542www.elsevier.com/locate/enbuildEffectivenessofpersonalventilationsystemusingrelativedecreaseoftracergasinthefirstminuteparameterSimonMuhicˇ,VincencButala*UniversityofLjubljana,CenterforEnergy&EnvironTech.,FacultyofMechanical
2、Engineering,Asˇkercˇeva6,SI-1000Ljubljana,SloveniaReceived23March2005;receivedinrevisedform21August2005;accepted2September2005AbstractVentilationeffectivenesswasmeasuredonaprototypesystemforlocalair-conditioningnamedpersonalmicroclimatesystem(PERMICS).Base
3、donsimultaneousmeasurementsofvelocityfieldandoftracergasconcentration,anewparameterbasedontherelativedecreaseoftracergasinthefirstminuteofsystemoperationwasintroduced.Theusefulnessofthisparameterhasbeenverifiedbysimulationresultsfromcommercialcomputationalflui
4、ddynamics(CFD)software.Thisparametermakesquickmeasurementsofthelocalefficiencyofventilationsystemspossible.#2005ElsevierB.V.Allrightsreserved.Keywords:Airdistribution;Localair-conditioning;Relativedecreaseofconcentration;Ventilationefficiency1.IntroductionIn
5、doorairqualityalsohasaneconomicimpact.Aftertheenergycrisis,thereweresavingsinspiteofincreasedThemainpurposeofheating,ventilation,andair-ventilationratesandtheincreasedenergyusethisentailed.conditioningsystemsistoprovideahealthyandcomfortableBuildingswithSB
6、Sareexpensivebecauseofdecreasedenvironmentfortheoccupantsofthespace.Whatisthermalproductivityandabsencefromwork,aswellasconsequentlycomfort?Thermalcomfortisthatconditionofmind,whichhigherhealthcarecosts[3].Thereisastrongconnectionexpressessatisfactionwitht
7、hethermalenvironment[1].Whilebetweenproductivityandindoorenvironment[4,5].thisdefinitionhasitsmerits,itcannotbeeasilytranslatedintoStudiescarriedoutinSlovenia[6–10]showthatpeoplearephysicalparametersbecausethermalcomfortdependsonmanydissatisfiedwiththeindoor
8、environment,especiallyinparameters(ambienttemperature,clothing,bodyconstitution,mechanicallyventilatedbuildings[11].Anotherfindingshowshealth,ageofindividual,activity,lighting,noiseinenviron-thesignificanceofps
