icepak教程

D-1ModelBuilding:IcepakObjectsD-2Topics•SimpleObjectsNoflowobjectsCabinet(default)WallsBlocksPlatesSourcesFlowobjectsOpeningsGrilleVolumetricResistances2D-FansHeatExchangersMaterialsSolidFluidSurface•CompositeObjects3D–FansEnclosuresPCBsAssembliesHeatSinksPackagesNetworksD-3CreatingNewObjectsWaystocreateandpositionobjectsinIcepakClickonobjecticonandeditit,orusethealignmenttoolstocreateitDragtheobjecticonintographicsdisplayareaIfusingthisoption,itissensibletoseta“snap”gridinOptions/Interactivemenutoensurethatre-location/positioningislimitedtothesnapgrid.Forexampleyoumaysetthesnapto1mmthenpositionislimitedtonearestmmChangeobjecttypeetc….TochangepropertiesofanobjectSelecttheobjectEnterchangesintheobjecteditformdiscussedintheprevioussectionD-4•Definesthecomputationaldomain–itisalwayscuboidalshape•Existsbydefaultwhenanewmodelisstarted•Defaultdimensions:1x1x1m3(orequivalentinotherunits)•Defaultfornewobjects-theywillbe1/5ththecabinetsizeandcentered•Noobjectmaywhollyorpartlyexistoutsidethecabinet–awarningmessagewillprompttheuserforanactionasinthefigurebelowUndotheoperationthatcausedtheobjecttogooutofcabinetObjectcanremainoutsidetemporarily,butthismessagewillreappear•AutoscalebuttoninthecabinetformorCOGresizesthecabinettojustfitallobjectsinthemodel•Scaling/movingthecabinetusingthemoveformscales/movestheentiremodelCabinetD-5Cabinet:PropertiesDefaultcabinetproperties:WallsareadiabaticWallshavezerovelocityOvercometheseconstraintsbyplacingfollowingobjectsoncabinetsides:walls–energytransferonlyopenings,ventsandfans–flowandenergytransferThecabinetformletsyouimposeanyoftheseobjectsontheentireside(s)ofthecabinet–theseobjectswillautomaticallyresizewhenthecabinetsizeischangedOpeningOpeningWallWallDefaultD-6Walls•Canonlybeplacedoncabinetsidesoronfacesofhollowblocks•Innersideofwallsseethefluid,whileoutersidesfacetheexteriorconditionsThreeTypes:•Stationary•Symmetry•Moving•Wallthicknessmayberealoreffective•Externalmaterialisalwaysspecified•SolidandinternalsurfacearespecifiedonlyforwallswiththicknessSolidmaterialSurfacematerialsDefaultIcon:Defaultcolor:GreyD-7Walls:ThermaldataDefaultIcon:Defaultcolor:GreyStationarywalls–mayhaveheattransferspecificationtotheoutsideOutsideheatfluxOutsidetemperatureExternalconditions/heattransfercoefficientSymmetrywalls-reducemodelsizewhenthemodelissymmetricaboutaplaneAdiabaticandFrictionlessZerofluxandflowthroughwallCanspecifyspatiallyvaryingprofileMovingwalls-accountformotionintheplaneofthewallThermalinputsofstationarywallsWallvelocityvectorD-8BlocksDefaultIcon:Defaultcolor:PinkCanbemeshedwitheitherMesherMustbemeshedwithTetrahedral-MesherD-9Blocks:ThermalmodelsDefaultIcon:Defaultcolor:Pink4ThermalModelsHollowblocks•Nomeshwithintheblocknoequationssolvedinsidehollowblock•NoheatconductionintheplanardirectionalongthesidesoftheblockHollowPolygonblocksusedtomodifydomainUsesofhollowblocks:•Maskoffregionsofthedomain•SimplifiedrepresentationofmodulesD-10Blocks:ThermalmodelsDefaultIcon:Defaultcolor:PinkSolidblocks•Versatileuses-canbeusedforalmostanysolidcomponent•Openings/fans/ventswillcutthroughsolidblocksiftheirdimensionsaresmallerthantheblockFluidblocks-uses•Multi-fluidmodels•CarveoutportionsfromsolidblocksNetworkblocks•Hollowblockwiththermalresistancenetworkinsidetheblock•4Typesofnetworks(Tworesistor,Star,ShuntandGeneral)•NetworkvaluesvisibleuponselectingblockUsesofnetworkblocks:•Simplifiedrepresentationofpackages/prismaticcomponentswithheatgenerationGeneralnetwork–3Junctionnetwork2ResistorStarnetworkFullshuntnetworkD-11Blocks:ThermaldataDefaultIcon:Defaultcolor:PinkSurfacedata–allblocktypes•RadiationDiscussedLater•IndividualSideSpecificationsThermalProperties-TotalPower,FluxorFixedTemperatureHeattransfercoefficienttomodelconductanceperunitareacontactresistanceRadiationspecificationforasideD-12Blocks:ThermaldataDefaultIcon:Defaultcolor:PinkThermaldata-Solidandfluidblocks•Materialspecification•Totalpower–uniformthroughthevolume•Poweroptions–temperaturedependence,Jouleheating,transientpower•Note:Inmulti-fluidproblems,fluidblocksmustnothaveacommoninterfaceNetworkblocks•Marktheboardside•Junctionpower•ResistancevaluesHollowblocks•Adiabaticinsideandonsurface•NoHeatTransfertootherobjectsD-13PlatesDefaultIcon:Defaultcolor:Orange6Thermalmodels:•Conductingthick–forcompactPCBs,solidobjectswithsmallthickness•Conductingthin–forsolidobjectswithsmallthickness,thinlayers(givesreducedmeshcount)•Contactresistance–foradhesives,interfacematerials•Adiabaticthin–forbaffles,non-conductingenclosures•HollowthickandFluid–identicaltohollowblocksandfluidblocksSurfacethermaldata:•Only2facesavailable–cannotspecifydataforthe“edgefaces”•Heattransfercoefficient/contactresistancecanbespecified•Nopoweronindividualsides•LocalRadiationcontrolsD-14Plates:ThermalmodelsDefaultIcon:Defaultcolor:OrangeConductingthick:•Platethicknessismodeledandmeshed•Poweroptions–constant,temperaturedependence,Jouleheating,transientpowerConductingthin:•Platethicknessiseffectiveonly–nomeshinthethickness•Conductioninboththein-planeandthr