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Stefan Breuer , Dennis Thomey DLR Institute for Solar research

Development of a solar driven tube receiver to superheat steam for the high temperature electrolysis. Stefan Breuer , Dennis Thomey DLR Institute for Solar research. Content. Overview Designstudy Thermal balancing Constructing and assembling the receiver Outlook .

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Stefan Breuer , Dennis Thomey DLR Institute for Solar research

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  1. > IRES 2012> Breuer > 14.11.2012 Development of a solar driventubereceivertosuperheatsteamforthe high temperatureelectrolysis Stefan Breuer, Dennis Thomey DLR Institute for Solar research

  2. > IRES 2012> Breuer > 14.11.2012 Content • Overview • Designstudy • Thermal balancing • Constructingandassemblingthereceiver • Outlook

  3. > IRES 2012> Breuer > 14.11.2012 OverviewOverall Process Development and experimental analysisof a solar receiver in the DLR high flux solar simulator 2011-14 2012-14 Techno-economicanalysis:Flowsheetingandsimulationof a MW-scalefacility.

  4. > IRES 2012> Breuer > 14.11.2012 OverviewMotivation (HTE) • Electricalenergydemanddrops • Heatdemandrises • Total demandrisesveryfew • Overall efficiencyimprovesat highertemperature

  5. > IRES 2012> Breuer > 14.11.2012 OverviewSolarsimulator • Solar Simulator in Cologne • 10 Xenon Lamps • Max. peak power outputat 36 kW • 90% radiationhitstargetof 9 cm • Max solar fluxdensity ~5 MW/m² • Implementing a shuttersystemforfluxcontrol

  6. > IRES 2012> Breuer > 14.11.2012 Designstudyvolumetricandtubulardifferences Open system: windowneeded Closedsystem: nowindowneeded Sealingproblemswithwindow Lots oftubeconnectors Useofstandardparts (tubes) Extrusion ofmonolithstructure SiSiC Structure High temperaturesteel/alloy

  7. > IRES 2012> Breuer > 14.11.2012 Thermal balancinggeometricallayout - integral calculation • Calculation of an integral system • Front (1) isopen • Assumptionof wall temperature • Calculatetheradiationofside (2) and back (3) tothe front • Viewfactorcalculationby VDI-Heatatlas • Calculationofneeded power forbackradiationand fluid heating • Cylinderhasgoodradiationandconstructingproperties 2 1 3

  8. > IRES 2012> Breuer > 14.11.2012 Thermal balancingthermal layout - differential calculation 2 • Segmentation into 10 ringelements • View factorscalculatedby MATLAB® • Wall temperaturecalculation via raytracing (OptiCAD ®) • Convectionalheattransferonto fluid per ringelement • Radiation heatexchangecalculation • Implementing a flux-densitycontroller (shutter-system) 2.1 2.2 2.3 2.4 2.n 1 3

  9. > IRES 2012> Breuer > 14.11.2012 Thermal balancingcalculationmethods - raytracing • Raytracingexecutedby OptiCAD • Implemented solar simulatordata • Division of wall into 10 ringelementswitheach 40 segments • Summation ofincoming power per ringelement • Focus distancevariationforoptimizedusageofincomingradiation

  10. > IRES 2012> Breuer > 14.11.2012 Thermal balancing Thermal balancing - focusvariationforincoming power

  11. > IRES 2012> Breuer > 14.11.2012 Thermal balancingcalculationmethods - heattransfer • Convectional heattransfercalculationby Nusselt-correlation VDI-HA • Logarithmicaveragetemperaturedepends on walltemperature • Wall temperaturedepends on incoming power and radiation • Radiation heattransfer

  12. > IRES 2012> Breuer > 14.11.2012 Designing a testreceiverforuse in theThermal balancing - variationofmassflow (examplecalculation)

  13. > IRES 2012> Breuer > 14.11.2012 ConstructingandassemblingEngingeering - construction & development • Construction was carried out in a 3D CAD system • Material researchfor high temperaturesteel (1.4841) • Insulation material usedforbuildingthecavity (Al2O3) • Implementingthemeasurementsensorsfortemperature & pressure • Programming a controllingsystemwith LabView®

  14. > IRES 2012> Breuer > 14.11.2012 ConstructingandassemblingEngingeering - assemblingthereceiverfor solar simulator Thermocouples Solar radiation Steaminlet Steamoutlet Pressuremeasurement

  15. > IRES 2012> Breuer > 14.11.2012 Outlook • Thermal testcampains will beexecuted in novemberanddecember • Bilancingoftheexistingsystemwith experimental data • Optimizingthesystemwith experimental results • Build a full high temperatureelectrolysiscycle • Improvethereceiverandrebuilditwithnewlyadapteddata

  16. > IRES 2012> Breuer > 14.11.2012 Solar driventubularheatexchanger Thankyouforyourattention!

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