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1、OpticaApplicata,Vol.XL,No.2,2010HighporositymaterialsasvolumetricreceiversforsolarenergeticsTHOMASFENDGermanAerospaceCenter,InstituteofTechnicalThermodynamics,SolarTechnologyDepartment,LinderHoehe,51143Köln,Germany;e-mail:Thomas.Fend@dlr.deThispapergivesabriefoverviewontheresear
2、chactivitiesoftheSolarTechnologyDepartmentoftheGermanAerospaceCenteronporousmaterialsforsolartowertechnology.Firstly,abriefintroductiontosolartowertechnologyisgiven.Then,thefunctionofthecentralcomponentoftowertechnology,thevolumetricairreceiver,isdescribedindetailandexamplesaswe
3、llasexperimentalresultsofreceivertestsaregiven.Resultsofnumericalstudiesarepresented,whichhavebeencarriedouttocharacterizeairflowstabilityinreceiversystems.Approachespresentlyusedtomodeltheinteriortemperaturesofthereceiveraredescribed.Nextspin-offapplicationssuchasparticlefilter
4、sorcoolingsystemsarepresented,whicharedominatedbysimilarphysicalphenomenaandwhichcanbetreatedwiththesameexperimentalandnumericalmethods.Finally,informationisgivenabouttheJülichSolarTower,whichisthefirsttestpowerstationthatmakesuseofthesolarairreceivertechnology.Keywords:solartow
5、ertechnology,porousmaterials,volumetricairreceiver,concentratingsolarpower.1.IntroductionSolartowertechnologyisapromisingwaytogeneratelargeamountsofelectricityfromconcentratedsolarpowerincountrieswithhighsolarresourcessuchasNorthAfricaandtheMiddleEast,India,AustraliaorpartsofNor
6、thandSouthAmerica,countriesknowntobelongtotheso-called“sun-belt”oftheEarth.Theconcentratedradiationisgeneratedbyalargenumberofcontrolledmirrors(heliostats),eachofwhichredirectsthesolarradiationontothereceiverasacommontargetonthetopofatower.Here,atthefocalpointtheso-called“solara
7、irreceiver”islocated,whichabsorbstheradiationandconvertsitintohightemperatureheat.Cellularhightemperatureresistantmaterialsareusedasreceivers.Asaheattransfermediumairisused,whichisheatedupbyflowingthroughtheopencellsofthehotreceivermaterialandwhichthenfeedsaconventionalboilerofa
8、steamturbine.Asanexample,a3MWsolartowertestplan
