PROGRESS IN THERMAL ENERGY STORAGE MODELING

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1、ProceedingsoftheASME20093rdInternationalConferenceofEnergySustainabilityProceedingsofES2009EnergySustainability2009ES2009July19-23,2009,SanFrancisco,California,July19-23,2009,SanFrancisco,CaliforniaUSAUSAES2009-ES2009-9011990119PROGRESSINTHERMALENERGYSTORAGEMODELINGDesikanBharathan

2、andGregC.GlatzmaierNationalRenewableEnergyLaboratoryGolden,COUSAABSTRACTThefeasibilityofusingmolten-saltstorageforparabolicEconomicanalysesforconcentratedsolarpower(CSP)troughpowerplantswasinvestigatedbyKellyetal.[1].Theysystemsindicatethatthecostofelectricitycanbereducedenvisioned

3、usingtwoseparatetankstostorecoldandhotsaltsthroughtheuseamolten-saltthermalenergystoragesystemineachforthestoragesystem.Figure1isasimplified(TES).Useofathermoclineinthetankstokeepcoldandhotschematicofthesystemstudied.fluidsseparateinthetankhasbeenproposedtofurtherreduceThetwo-tankc

4、onceptwastestedintheSolarTwoprojectthecostforTEStoabout$30/kWhthermal.Thispaperstudiesusingmoltensaltasthestoragefluidmedium[2].Nomajorthedetailsformolten-saltstoragewherethetankisfilledwithtechnicalbarrierswereidentified,soHerrmannetal.[3]nominally1-inch-sizequartziterocksand¼-inc

5、hsandundertookastudytoevaluatetwo-tankmolten-saltstorageforparticles.Thesefillermaterialsareenvisionedtooccupy75%aparabolictroughsolarpowerplantofnominal50-MWeofthetank’svolume.ExperimentsatSandiaNationalcapacity.By“two-tank,”theymeantthatthehotandcoldLaboratoriesindicatethatthesef

6、illermaterialsarecompatiblestoragefluidsaremaintainedseparately.Thestoragesystemwiththemoltensalt,andawell-establishedthermoclinecanbewasdesignedtovaryincapacitytokeeptheplantrunningfrommaintainedinthesetanks.TheNationalRenewableEnergy1to15hours,usingthestoragecapacityalone.Theycon

7、cludedLaboratoryattemptstolookintothenextlevelforthetankthatthestoragesystembecomesattractiveifitcanprovideadesign,modelingheattransferbetweensolidfillerandmoltenminimumstoragecapacityfor3hours.Theyestimatedthatthesalt.Loosefillermaterialsexertaddedhoopstressesinthetankspecificcost

8、foratwo-tankmolten-saltsto