Plate heat exchangers for refrigeration

PlateheatexchangersforrefrigerationProductcatalogueforsemi-weldedandall-weldedplateheatexchangers3InsideviewSemi-welded4Generaldescription10M6-MWFGRevaporator11M10-BWREFevaporator12M10-BWFTREFcascade13MK15-BWFGRevaporator14T20-BWFGevaporator15T20-MWFGevaporator16M6-MWFDRcondenser17M10-BWREFcondenser18M10-BWFDRcondenser19MK15-BWFDRcondenser20T20-BWFScondenser21T20-MWFScondenser22StandardconnectionsAll-welded(AlfaRex)23Generaldescription25TM10-BFDR26TM10-BFTR27TM20-BFFR28TM20-BFKR29TM20-BFNRThisproductbrochureisacollectionofgeneraltechnicalinformationabouttheAlfaLavalsemi-weldedplateheatexchangerandall-weldedplateheatexchanger(AlfaRex)designedforrefrigerationduties.Generaldescription-Semi-weldedplateheatexchangersThechannelsfortherefrigerantandthebrinearesealedbylaserweldsandgaskets.SWPHEasanevaporatorinabreweryinstallation.ThecompleterangeofAlfaLavalplatesforSWPHE.Semi-weldedplateheatexchangerTheAlfaLavalsemi-weldedheatexchanger(SWPHE)alternatesweldedchannelsandtraditionalgasketedchannels.Therefrigerantflowsinweldedchannelsandtheonlygasketsincontactwiththerefrigerantaretwocircularportholegas-ketsbetweentheweldedplatepairs.Thesegasketsaremadefromhighlyresistantmaterials,attachedforeasyreplacementbyaglue-freeconstruction.Thesecondarymediumflowsinchan-nelssealedbytraditionalelastomergaskets.Doublesealingandcorrosionresistantplatematerialspreventintermixtureofmedia,theabsenceofpressure-retain-ingsealweldsandaflexible,yetvibra-tion-resistantdesign.ApplicationsTheAlfaLavalsemi-weldedheatexchangersareusedasevaporatorsandcondensersforrefrigerationsystemsinawholeseriesofapplica-tions,eg:•Dairy,breweryandvineyardproduction•Marine•Fishingvesselsandfishprocessing•Slaughterhouses•Chemicalandpharmaceuticalindustries•Icemanufacturing,ice-skatingrinks•Coldandfrozenstorage•FoodretailoutletWhenthegasketedsideisfoodapproveditcouldbeusedindirectcoolingoffoodliquids,eg.NH3/beer,juiceorwater.Otherapplicationlikeheatpumps,organicrankinecyclesandabsorptionsystemscouldalsorequestSWPHEfordifferentduties.FeaturesTheSWPHEisveryflexibleandvariableandcanbearrangedinTwinortwo-units-in-onedesign,e.g.desuperheater/condenser,oilcooler/condenser.Thesefeaturesgivesthepossibilitytomanufacturetwodutiesinoneframeatalowercost,smallervolumeandshorterfootprint.DisassemblingandassemblingpossibilitiesTheplateheatexchangerconceptallowstheSWPHEtobeopenedandreclosedseveraltimes.Thismakesassemblyonsitepiecebypiecepossible,whichisanadvantagewhentransportationspaceislimited.ItalsoallowsopeningtheSWPHEforservice.Sinceallconnectionsarenormallyloca-tedatoneend,nopipeworkremovalforserviceisnecessary.Theheattransfersurfacecouldalsobeaugmentedifthecapacityisincreasedorifthetemperatureprogramischanged.ααβββαααβββαααβββα5GeneraldescriptionSWPHEbecomesmorecompactandrequestalowerfillingofrefrigerantforthesameduty.AdvantagesTheplateheatexchangerconcept,withflow-throughchannelsformedbycorrugatedplatesandtheheattransfertakingplacethroughthethinplates,isanextremelyefficientheatexchangetechnique.Theturbulentflow,coupledwithlowfoulingfactorsandhighheattransfercoefficients,meansthatitispossibletooperatewithasmalltemperaturediffe-renceinevaporatingandchilledwatertemperatures.ThisinturnprovidesagoodoperationaleconomywithhighC.O.P.values.Italsomeansthatasemi-weldedplateheatexchangerbecomesmuchmorecompactthanashell&tubeheatex-changerforthesameduty.Thepracticaladvantagesare:•lowerweight•smallerspacerequirements•lowerrefrigerantfillingCharacteristicsofcassettesThecassettesaredesignedinthreedifferentanglesofcorrugation:LowTheta=forhigherflowandhightemperatureapproachMediumTheta=formediumflowandmediumtemperatureapproachHighTheta=forlowerflowandlowtemperatureapproachTheMediumThetacassetteisamixtureofHighandLowThetaplates.Newplatecassettesinalternativematerialcanbeinsertedwhenmorecorrosivecoolingwaterisintroduced.Thefollowingplatematerialsarestandard:•AISI304•AISI316onrequest:•Titanium•Alloy254•AlloyC-276HighThetaMediumThetaαβLowTheta6GeneraldescriptionDuetoflexibledesign,nodamagewilloccurwhenfreezing.MechanicalaspectsandfreezingTheSWPHEisnotsensitivetotempe-ratureshocks,andthereisnovibrationduetothesmalldistancebetweenthesupportpoints.ThereisnopressureretainingweldsintheSWPHE.Duetotheturbulentflow,freezingrisksaresmall,buttheflexibledesignwillaccommodateexpansion,andnodamagewillbecausedshouldfreezingoccur.LeakdetectionIntermixingofmediaisnotpossiblewiththedoublesealing.Thediagonalgas-ketsformtheweakestcomponents,andanyleakwilloccurthroughagas-ket,whichisexternallydetectableforbothmediasides.TheAlfaLavalSWPHEisdesignedwithnointernalwelds,andhencetherewillbenointernalleaks.GuaranteeandmaintenanceTheguaranteefortheSWPHEis12monthsfromthedeliverydate.Theguaranteeisnotvalidiftheunitisope-ratedunderconditionsotherthanthosespecified.Itisveryimportantthattheunitisinstalledandsetupaccordingtotheinstructions.GasketreplacementofSWPHEwillberecommendedforevaporator/condenseratanintervalof5/4yearsforringgasketsand10/8yearsforfieldgaskets.Incaseoffoulinggrowth,theSWPHEcanbecleanedbyCIPonsite.Amobi