AMESim的热库

TechnicalBulletinn°115TitreTheAMESimThermalLibraries–@[e-mail][e-mail]®andAMESet®aretheregisteredtrademarkofIMAGINESA.AllotherproductnamesaretrademarksorregisteredtrademarksoftheirrespectivecompaniesLatestupdate:Feb.26th,2002TheAMESimThermalLibraries3/17–âThermal,Thermal-hydraulicandCoolingSystemLibraries.1.TheThermallibraryInthiscategoryallthecomponentshavethermalportsonlyandthevariablespassedattheseportsare:ÄTemperature[degC]ÄHeatflowrate[W]Figure1:TheAMESimâThermalLibraryTheAMESimThermalLibraries4/17–:ÄanalyticalformulaeÄempiricaldatatoprescribeheatflow.Forempiricaldata,thiswouldbedefinedbysignalinput.Figure2:convectiveexchangeFigure3:radiativeexchangeForexample,inanenginecylinder,theconvectiveandtheradiativeheattransfercoefficientcanbesuppliedbyempiricaldata,whicharefunctionoftheenginespeedandtheeffectivemeanpressure.Acombinationofconductanceandmasscomponentsenablesyoutomodelcomplextemperatureandheatflowboundaryconditions.Figure4:temperatureboundaryFigure5:heatflowboundaryconditionconditionTheAMESimThermalLibraries5/17–(capacity)1DconductionTable1:ModelsoftheThermalLibrary2.TheThermal-hydraulicLibraryTheAMESimâThermal-hydrauliclibrarycomprisesasetofbasiccomponentsfromwhich,itiseasytomodellargethermal-hydraulicnetworksanddevelopthedesignofthesystemsstudied.TheAMESimThermalLibraries6/17–:ÄAbsolutepressure[barA]ÄTemperature[degC]ÄMassflowrate[kg/s]ÄHeatflowrate[W]Figure6:AMESimâThermal-hydraulicLibrary-Thermal-hydrauliccategoryByusingtheThermal-hydrauliccategoryitispossibletopredictpressures,fluidflowrates,temperaturesandenthalpyflowratesinahydraulicsystemtakingintoaccountheatexchangeswithenvironment.Thiscategoryoffersasetofcomponentsallowingyoutomodelsystemscontaining:ÄThermal-hydraulicresistancecomponents:theseareorifices,expansions/contractions,diffusers,annularpipes,bends,T-junctions…TheAMESimThermalLibraries7/17–:theseareadiabaticpipes/hosesandpipes/hoseswithexternalheatexchanged.Forhosemodelsthepressureiscomputedtakingintoaccountthehosewallexpansion.Also,inthethermal-hydraulicresistanceandpipes/hosesmodels,theincreaseoffluidtemperatureduetothepressuredropisalsotakenintoaccount.ÄThermal-hydraulicaccumulatorcomponents:thesecontainaconstantmassofgasorapneumaticportcompatiblewithAMESimâPneumaticLibrary.ÄThermal-hydraulicpumpcomponents:thesearevolumetricpumpsandcentrifugalpumps.Thetemperatureofthefluidflowingoutofthepumpiscomputedusinganoverallfractionalefficiencyparameterdefinedbytheuser.ÄThermal-hydraulictransducers:thesearepressure,temperatureandfluidflowratetransducers.Theyareusedtoconvertthermal-hydraulicvariablesintosignalsfromwhichitispossibletocontrolorpilotcomponents,forexample,itispossibletocontroltheradiator'sfanoperatingsequenceasafunctionofthecoolanttemperatureatradiator'soutlet,orevenbyobservingthevolumetricflowratebetweenanythermal-hydraulicconnection.ÄMultiplethermal-fluids:InAMESimâThermal-hydraulicLibrary,thefluidpropertiesareevaluatedatworkingpressureandtemperature.AfluidisdefinedintheAMESimâThermal-hydraulicLibrarybyaspecialicon.Byusingseveralofthesespecialiconsonthesketch,theusercaneasilymodelsystemscontainingdifferentfluids.Forexample,itispossibletomodelonthesamesketchanenginecoolingcircuitcoupledwiththelubricatingcircuitandstudytheheatexchangesbetweenthem.Thefollowingtablepresentsthethermalcomponents:TheAMESimThermalLibraries8/17–