资源描述：
《ASHRAE.4506-2002 Flow of Refrigerant 134a Through Orifice Tubes》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、4506ReprintedfromtheInternationalJournalofHeating,Ventilating,Air-ConditioningandRefrigeratingResearch.FlowofRefrigerant134aThroughOrificeTubesG.M.SinghP.S.HrnjakC.W.BullardStudentMemberASHRAEMemberASHRAEMemberASHRAEInthispaper,experimentaldataandamodelforpredictingrefrigerantflo
2、wthroughorificetubesusedasexpansiondevicesinautomotiveandotherairconditioningsystemsarepresented.Theresultsareanalyzedforanextensiveset(933datapoints)ofmeasurementsofmassflowrateof1,1,1,2,-tetrafluoroethane(CH2FCF3,betterknownasrefrigerantR-134a)throughori-ficetubesofdifferentdia
3、metersandlengths,withandwithoutinletandoutletscreens,overawiderangeofoperatingconditions,andintherangeofinletqualitiesfrom0to1andsubcool-ingupto40°C.Themassflowratethroughorificetubeswasfoundtobeastrongfunctionofinletpressure,inletsubcooling,anddiameter,butarelativelyweakfunction
4、oflength.Thesemi-empiricalmodelisdevelopedusingthedatasetandisapplicableoverthecompleterangeofoperatingconditionscoveringtransientsandveryhighvaporqualityinletsthatarecommoninautomotiveairconditioningapplications.INTRODUCTIONTheorificetubeisasimpleexpansiondevice.Itissimilarinpri
5、ncipletocapillarytubesandthedivisionisarbitrary.Mostlybecauseofsimplicityofdesign,reliability,easeofreplacement,andcosteffectiveness,orificetubesarebecomingverypopularinmobileandresidentialaircon-ditioningsystems.Single-phaseincompressiblefluidflowthroughorificesiswellunderstooda
6、ndmathemati-callydescribedtosuchadegreethat,ifgeometricaltolerancesaremet,orificesareoftenusedasflowmeters.Two-phaseflowthroughorificeandcapillarytubesismuchmorecomplexandlesswellunderstood.Themajorityofresearchtodatehasfocusedoncapillarytubes.Onlyasmallfractionoftheresearchintot
7、hefixedareaexpansiondeviceshasbeenfocusedonorificetubephenomena.Dataareavailableforjustafewrefrigerants:Pasqua(1953),Mei(1982),AaronandDomanski(1990),KimandO’Neal(1993),PayneandO’Neal(1998)andothers.ThearticlesavailableinopenliteraturepriortothisstudyaresummarizedinFigure1.Mostof
8、theearlierpapersfocusedontheflowofwatert
