级联式二氧化碳和氨原型制冷系统制冷过程应用的实验性探究——外文翻译.docx
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1、Experimenta1eva1uationofacascaderefrigerationsystemprototypewithCO2andNH3forfreezingprocessapp1icationsABSTRACT:AprototypeofacascaderefrigerationsystemusingNH3andCO2asrefrigerantshasbeendesignedandbui1t.Theprototypeisusedtosupp1ya9RWrefrigerationcapacityhorizonta1p1atefreezeratanevaporatingtemperatu
2、reof50aCasdesignconditions.Theprototypeinc1udesaspecificcontro1systemandadataacquisitionsystem.Theexperimenta1eva1uationstartedwiththerea1conditionswithinthedesignoperatingparameters.Subsequent1y,severa1testswereperformedfixingfourCO2evaporatingtemperatures(-50aC,-45aC,-40aCand-35aC).Ateachoneofthee
3、vaporatingtemperatureseva1uated,theCO2condensingtemperaturewasvariedfrom-17.5aCto-7.5aCandanexperimenta1optimumva1ueofCO2condensingtemperaturewasdetermined.Thediscussionsontheexperimenta1resu1tsinc1udetheinf1uenceoftheoperatingparametersonthecascadesystem,sperformance.Inaddition,theexperimenta1resu1
4、tsarecomparedwithtwocommondoub1estagerefrigerationsystemsusingNH3asrefrigerant.Keywords:RefrigerationsystemCascadesystemCarbondioxideAmmonia-deve1opmentPrototype-experimentIntroductionCurrent1ytherefrigerationindustryiswitnessingimportantchangesowingtothefactthatthesyntheticrefrigerants,whichhaveane
5、gativeimpactontheozone1ayerorconsideredresponsib1eforg1oba1warming,havebeenbannedorareintheprocessofbeingout1awedorrestrictedinthenearfuture.Asbetter1ong-terma1ternativesrep1acethem,1orentzen(1994)suggestedtheuseofnatura1substancessuchasammonia,carbondioxideandthehydrocarbonsasrefrigerants,thuscausi
6、ngarenewedinterestinthisarea.Atthebeginningofthe1astcenturyanothernatura1substance,C02,wasusedasrefrigerant.Thiswasrep1acedinthemidd1eofthe1900sbyartificia1refrigerantspresent1ybanned(Kimeta1.,2004).Recent1ypub1ishedresearchesby1orentzen(1994)andPearson(2005)pointoutthattorecommencetheemp1oymentofCO
7、2asarefrigerantoffershighpotentia1whenusedinIowtemperaturerefrigerationSystemsJnc1udedwithintheadvantagesofCO2isthatitisenvironmenta11yfriend1y,non-toxic,non-exp1osive,easi1yavai1ab1eandcanbeusedinrefrigerationprocesseswithinawiderangeoftemperatures(from50C).Inaddition,itiscompatib1ewiththeoi1scommo
8、n1yusedinactua1refrigerationsystems(Bao1ianandYufeng,2007).Itoffers1owpressureratiosandIowspecificvo1umeva1ues,whichwhencoup1edwithhighpressure1eve1sa11owsforreductioninsizeofrefrigerationcomponents(Cabe11oeta1.,2008).ThemaindisadvantagesofCO2asarefrigerantarethehighworkpressures(7.2MPaat30C).1orent
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