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Numerical models of advanced ceramic absorbers for volumetric solar receivers

Capuano, Raffaele und Fend, Thomas und Schwarzbözl, Peter und Smirnova, Olena und Stadler, Hannes und Hoffschmidt, Bernhard und Pitz-Paal, Robert (2016) Numerical models of advanced ceramic absorbers for volumetric solar receivers. Renewable and Sustainable Energy Reviews. Elsevier. doi: 10.1016/j.rser.2015.12.068. ISSN 1364-0321.

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Kurzfassung

Nowadays, due to the pressing global energy demand, a possible source of renewable energy is represented by solar energy. Concentrated solar power (CSP) represents an excellent alternative, or add-on to existing systems for large-scale energy production. In those systems and, particularly, in solar tower plants (STP), mirroring surfaces reflect sunlight, focusing it on the core-component defined as volumetric receiver. Here, a porous structure (absorber) is responsible for converting the solar radiation into heat with the use of evolving air under natural convection. The proper design of this element is essential in order to achieve high efficiencies that can make such facilities extremely advantageous. In this paper, an overview of the different approaches for the numerical modeling developed at the German Aerospace Center (DLR), are presented, based both on detailed and homogeneous representation (discrete and continuum approaches, respectively) of the absorber. The corresponding numerical models were run again and compared where possible, using as reference case pre-exiting experimental evaluation, pointing out shortcomings and differences. Temperature profiles for solid and fluid phase, as well as efficiency value, are used as key parameters in the comparison, showing a substantial gap between numerical and experimental results. This inconsistency can be addressed both to inherent difficulties in the experiments butalso on the lack of a proper characterization of the absorber radiative behavior that directly affects the heat transfer process. This gap is even more pronounced when the use of a continuum approach is considered, due to implicit approximation introduced by the homogeneous representation of the porous volume. For those reasons, a better representation of the radiative heat transfer must be introduced in future conjugate numerical models and the use of a continuum approach can be addressed to a preliminary design procedure, given the possibility to quickly manipulate geometric and thermodynamic parameters of porous structures.

elib-URL des Eintrags:https://elib.dlr.de/107499/
Dokumentart:Zeitschriftenbeitrag
Titel:Numerical models of advanced ceramic absorbers for volumetric solar receivers
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Capuano, RaffaeleRaffaele.Capuano (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Fend, ThomasThomas.Fend (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schwarzbözl, PeterPeter.Schwarzboezl (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Smirnova, OlenaOlena.Smirnova (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stadler, HannesHannes.Stadler (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hoffschmidt, BernhardBernhard.Hoffschmidt (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391NICHT SPEZIFIZIERT
Datum:2016
Erschienen in:Renewable and Sustainable Energy Reviews
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1016/j.rser.2015.12.068
Verlag:Elsevier
ISSN:1364-0321
Status:veröffentlicht
Stichwörter:Volumetric solar receiver; CSP; Numerical simulation; Analytical model
HGF - Forschungsbereich:Energie
HGF - Programm:Energieeffizienz, Materialien und Ressourcen
HGF - Programmthema:Methoden und Konzepte für Materialentwicklung
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E VG - Verbrennungs- und Gasturbinentechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Materialien für die Energietechnik (alt)
Standort: Jülich
Institute & Einrichtungen:Institut für Solarforschung > Großanlagen und solare Materialien
Hinterlegt von: Fend, Dr.-Ing. Thomas
Hinterlegt am:24 Nov 2016 14:34
Letzte Änderung:06 Nov 2023 08:51

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