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从过滤效率和滤网寿命来比较HEPA过滤网与静电过滤网哪个好

发布时间:2020-01-15 丨 阅读次数:0次

从过滤效率和滤网寿命来比较HEPA过滤网与静电过滤网哪个好

       HEPAfiltersbyChrisWoodford.Lastupdated:June2,2019.Wetendtothinkofairpollutionassomethingthathappensoutside—butthat\snotalwaysthecase.Eveninsideyourhome,therearethingslikedustmitesanddirttroddeninfromoutdoorstoworryabout.Indoorairpollutionfromsourceslikethiscanirritateyourlungsandcontributetoallergiesandasthma.Thetroubleis,ifyouuseanordinaryvacuumcleaner,youmightsimplybe"rearrangingthedirt":yourcleanerwilltrapsomeofthedustinsidethebagorcyclonefilterbutlettherestpassstraightbackintotheroom.Ifyousufferfromasthmaoranotherbreathingdifficulty,youmayfindaHEPA(sometimesdefinedas"high-efficiencyparticulateair,"sometimesas"high-energyparticulatearresting")airpurifier(oravacuumwithaHEPAfilter)wellworththeinvestment.Let\stakealookathowtheywork.Photo:AtypicalHEPAfilterfromahouseholdvacuumcleaner.Youcanseethewhite,paper-like,fibermaterialfoldedandwrappedaroundlikeaconcertinaundertheorangeplastictopandbottomcase.Thefoldinggreatlyincreasestheareaofthefilterincontactwiththeairstream—effectivelyimprovingthefiltrationwithoutreducingtheairflow.AdvertisementHowHEPAfiltersworktotrapdustanddirt

       Photo:ThesameHEPAfilterwithitsgrayoutergauzefilterattached.Theairmovesfromtheoutsidetotheinside.Youcanseethatthegauzeworksherelikeasievetostoplargerbitsofdirtgettinganywherenearthefilterinside.However,theinnerHEPAfilterworksinacompletelydifferentway.Theoutergauze"pre-filter"cangreatlyextendthelifeoftheinnerHEPAfilter.Thesimplestkindoffilterisasieve:somethingwithholesthatarebigenoughtotrapsomeparticlesandsmallenoughtoletothersthrough.Somevacuumcleanersdousefilterslikethistostopbiggerparticlesofdustanddirt—buthowdoyoucatchsmallerdirtparticlesaswell?Youcouldmakeaveryfinefilteroryoucouldputseveralfiltersontopofoneanother,butinavacuumcleanertheywouldclogupveryquicklyandstopthemachinefromworking.Notonlythat,you\dneedamorepowerfulelectricmotortopulltheairthroughthemachine,anditwouldusemoreenergyandcostmoretorun.HEPAfiltersinvacuumcleanerstendtousetwoquitedifferentmechanismstocleantheairstream.First,thereareoneormoreouterfiltersthatworklikesievestostopthelargerparticlesofdirt,dust,andhair.Insidethosefilters,thereisaconcertinaofwhatlookslikefoldedpaperdesignedtotrapthesmallerparticles.Thepaperisactuallyamatofverydenseglassfibersand,unlikethegauze,itdoesn\tsimplyfilteroutsmalldustparticleslikeasieve.Instead,itusesthreedifferentmechanismstocatchdustparticlesastheypassthroughinthemovingairstream.Athighairspeeds,someparticlesarecaughtandtrappedastheysmashdirectlyintothefibers,whileotherssnagonthefibersastheytrytobrushby.Atlowerairspeeds,dustparticlestendtowanderaboutmorerandomlythroughthefilter(aprocessknownasBrownianmotionafteritsdiscoverer,ScottishbotanistRobertBrown)andmaysticktoitsfibersastheydoso.Together,thesethreemechanismsallowHEPAfilterstocatchparticlesthatarebothlargerandsmallerthanacertaintargetsize.

       Artwork:ThefibersinHEPAfilters(shownhereasgraybars)trapdustanddirtparticlesinthreeways.Someparticlescrashintofilterfibersandareabsorbedbyimpact.Somearecaughtastheyflowalonginthemovingairstream,movetooclosetoafiberandaretrappedbyinterception.Atlowerairspeeds,somearetrappedbydiffusion(whenrandomlymovingdustandairparticlescrashintooneanotherandsomearepushedintothefilterfibers).HEPAwasoriginallydevelopedbythenuclearindustrytohelpcleanupdangerous,radioactiveparticles.Fortunately,mostofusdon\thavetodealwithsuchthings—butHEPAfiltrationisstillveryusefulandimportantinfactoriesandworkplaces,especiallyinenvironmentswheredustisproducedaspartofthemanufacturingprocess.TypesofHEPAfiltersAccordingtoNIOSH(theUSNationalInstituteforOccupationalSafetyandHealth),atrueHEPAfilterisonethatcantrap99.97percentofdustparticlesthatare0.3micronsindiameter(whereamicronisonemillionthofameter).There\snothingparticularlysignificantaboutparticles0.3micronsindiameter:theyaresimplytheonesmostlikelytogetthroughthefilter,andsmallerandlargerparticlesthanthisaretrappedevenmoreeffectively.Toput0.3micronsinperspective,it\sworthrememberingthatatypicalhumanhairisroughly50–150micronsindiameter,soaHEPAfilteristrappingdustseveralhundredtimesthinner.Thecoarse,sootyparticulatesthatspewfromdieselcarexhaustsaregenerallydescribedasPM10(particleslessthan10microns)orPM2.5(lessthan2.5microns),soyoucanseethatHEPAfiltersareworkingatascaleatleast10timessmaller.AgenuineHEPAfilterismuchmorehygienicthananordinaryonebecauseitwillstopmoldsporesandevensomebacteriaandviruses.It\scleaningatthemicroscopicscale.

       Artwork:HEPAfiltersscreenouttrulytinyparticlesdowntoabout0.3microns(blueline,bottom),whichis10–30timessmallerthanPM10andPM2.5sootpollution(black/gray,middle),andhundredsoftimesthinnerthanatypicalhumanhair(brown,top).Whenitcomestofiltersusedin_respiratoryequipment_,NIOSHrecognizesninedifferentgrades,basedonthreedifferentlevelsofefficiency(95,99,and99.97percent)andthreelevelsofresistancetofilterdegradation(N,R,andP).Nmeansnotresistanttooil,Risoilresistant,andPisoilproof.SoyoumightseeafilterlabeledN95(95percentefficientandnotresistanttooil)orP100(99.97percentefficientandoilproof).YoumightalsoseeHEPAfiltersclassifiedusingthefivelettersAthroughE,basedonhowwelltheycaptureparticlesandresistairflow.TypeAaretheleasteffectivethatstillmeetthebasiccriteriaforHEPA,whiletypeE(attheoppositeendofthescale)aremilitarygradefilterscapableofcopingwithchemical,radiological,orbiologicalparticles.There\salsoaclassificationbasedonwhetherfiltersarefireresistant(type1)orsemi-combustible(type2).

       Photo:ThetwoHEPAfiltersinaDysonvacuumcleaner(oneaboveandonebelowthedirtcylinder)helptostopdustreturningtotheroom.ThingstoconsiderbeforebuyingEvenifyou\reanallergysufferer,thesesortsofclassificationprobablyaren\tgoingtoberelevantifallyou\redoingisbuyingasimpleairpurifierorvacuumcleaner.Formostpeople,thekeythingistomakesurewhatyou\rebuyinghasgenuineHEPAfiltration(remember,that\s99.97percentofparticlesat0.3microns—oftendescribedas"trueHEPA"or"absoluteHEPA")bycheckingtheparticulatesizequotedbythemanufacturer.Avoidmanufacturerswhomakevague,meaninglessdescriptionslike"HEPA-like"and"HEPA-type"thataren\tquantifiedinanyway.AtrueHEPAfilterwillalwaysquotethenumbers.Someprofessional-gradevacuumswillhaveextramechanismsfordealingwithparticlesevensmallerthan0.3microns,suchasactivatedcarbongranules(similartothoseinwaterfilters).Finally,ifyouneedindustrial-strengthaircleaning,there\satougherstandardcalledULPA(Ultra-LowPenetrationAir)thatcancatch99.99percentofparticles0.12micronsandabove.Knowingabitabouthowfiltersworkcomesinhandywhenyou\redecidingwhattobuy.AvacuumwithproperHEPAfiltrationwillchannelvirtuallyall(over90percent)ofthedirtyairstreamthroughthefilter;ifitdoesn\tdothis,it\ssimplyrearrangingthedirt.HEPAfiltersobstructtheairstreaminvacuumcleaners:ittakesquitealotofsuctiontopullairpastallthoseconvolutedfibers.That\swhyvacuumswithtrueHEPAfiltrationneedmorepowerfulmotorsandoneswithlowpowermaynotcleaneffectively.AirpurifiersthatuseHEPAfiltrationmayhavehigherpowerconsumptionforthesamereason(whichmeansthey\remoreexpensivetorunforlongperiodsandnoisierthanrivaltechnologies,suchasphotocatalysis,thatworkindifferentways).AHEPAfilterwillalsoneedcleaningorreplacingperiodicallyaswell(whichwilladdtotherunningcosts);youmightwanttocheckhowmuchreplacementfilterscostbeforeyoucommityourself.

       Photo:Airfiltersingasmasks:HEPAfilterswereoriginallydevelopedinthe1940sformilitaryuse—andtheyremainanimportantlineofdefenseagainstprotectionagainstchemical,biological,andradiologicalwarfaretothisday.PhotobyLamelJ.HintoncourtesyofUSNavy.WhoinventedHEPAfilters?Likemanyotherinventions,HEPAfiltersdevelopedovertime:theredoesn\tappeartobeasingleinventorwhodeservessolecredit.Fiber-basedairfilterswereoriginallydevelopedduringtheManhattanProject(whichproducedtheworld\sfirstatomicbomb)asawayoftrappingextremelydangerous,tinyradioactiveparticles.Afterthewar,GermanbrothersKlausandManfredHammesbegandevelopingrelativelyinexpensiveairfilteringsystemsduringtheearly1960storeducesootparticlesproducedbycoal-firedstoves;theywentontofoundacompanycalledIQAir,whichhasbeenapioneerofairfilteringequipmenteversince.Thefirstinexpensive,pleatedairfilterwaspatentedonApril19,1966byKennethW.DeBaunandyoucanreadallaboutitinhisUSPatent3,246,457:PleatedAirFilterCartridge.,高效大气过滤,也时常被行叫作HEPA(HighEfficiencyParticulateairFilter)。

       在大气条件不佳的地域应用,得以有效的掩护透气康健。

       一般来说咱证验的那样,虽说滤网洗刷后表盘看起来清洁了很多,但并且也失掉了净化力量,因而,HEPA滤网真的不许水洗,如其感过硬里的HEPA滤网应用很长一段时刻后已经变脏了,那样最好囡囡的换一块新的吧,别心疼钱。

       人力透气机中HEPA过滤器的规程值:过滤器频率性能基准和极小值一是等效的NIOSHN100规程值。

       想懂得缩小大气是不是能用于清洗HEPA?我在Quora上也议论了这情况。

       咱引荐应用级别较高的HEPA过滤网(HighefficiencyparticulateairFilter),别称为高效大气过滤器,HEPA大气过滤网利用的高效滤纸不一样,过滤频率也不一样。

       它的材径直反应着芬尼新风净化机的性能与使用寿命。

       !(过滤器它们如何职业?!(大大部分当代的HEPA过滤器由交织的水玻璃纤维组成,扭曲并在无数方位转悠以形成纤维迷宫。

       只是有很多洁净渴求比高的场合,要紧使用的抑或水玻璃纤维滤纸,也即HEPA过滤器。

       ULPA滤芯用超细水玻璃纤维滤料经打胶沁而成,外框可依据客户渴求定制,普通选用木板、镀锌小钱、不锈誊写钢版及铝合金板,品质轻、漏器量大。

       这是一个在工上有理的系布置做法。

       如其径直译者美国能源部的界说,则为一样具有刚性壳包袱、全深褶皱、扩充介质的摈弃式干性滤网。

       要想大气净化器过滤高功用的久,你务须会调养HEPA滤网。

       HEPA滤网借助着本身的众多长处很多场合取得了广阔的应用。

       欧洲的基准更为人们所常用,从欧标EN779-1993、EN1882-1998肇始,体系分开成G1-G4、F5-F9、H10-H14、U15-U17共4个档次,17个等第。

       而雷同每日24小时不住开机用户和一周只开一天的用户,她们滤网更替次数也大不一样。

       清洗完毕后,将滤网晒干并装回到大气净化器内。

       如其没效果,咱提议你径直更替滤芯。

       五类不一样材的HEPA滤网网个别有其优缺欠,要紧的使用天地也各有不一样。

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