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Experimentally assessed efficiency improvement of innovative 3D-shaped structures as volumetric absorbers

Broeske, Robin Tim and Schwarzbözl, Peter and Birkigt, Lisa and Vasic, Srdan and Dung, Sebastian and Doerbeck, Till and Hoffschmidt, Bernhard (2023) Experimentally assessed efficiency improvement of innovative 3D-shaped structures as volumetric absorbers. Renewable Energy (218). Elsevier. doi: 10.1016/j.renene.2023.119220. ISSN 0960-1481.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0960148123011357


Solar tower plants are predicted to take on a significant role in the ongoing global energy transition. The open volumetric air receiver technology can provide an alternative to molten salt receivers due to its proven and effective storage capabilities. The key component of this technology are porous absorber structures which are responsible for the absorption of the solar irradiation. Research of porous structures has consistently shown that 3D-shaped absorber designs offer the highest efficiency potential. The realization of such designs is made possible by newer manufacturing techniques. In this publication, experimental results for two groups of new volumetric absorbers are presented. The StepRec absorber is manufactured via ceramic 3D screen printing, its characteristic step-pin sections allow for deep penetration of the solar irradiation. Additionally, metallic foil absorbers were evaluated, they exhibit particularly high specific surface areas due to low wall thicknesses. The new absorbers were tested for flux densities up to 650kWm2 and air exit temperatures up to 735°C. The experiments successfully confirmed the new absorbers' great potential: They outperformed the HiTRec reference, a ceramic honeycomb structure, for all air temperatures. At 650°C, thermal efficiencies up to 91.8% were recorded, an improvement of 6.5%-points w.r.t. to the HiTRec result.

Item URL in elib:https://elib.dlr.de/196771/
Document Type:Article
Title:Experimentally assessed efficiency improvement of innovative 3D-shaped structures as volumetric absorbers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Broeske, Robin TimUNSPECIFIEDhttps://orcid.org/0000-0001-5157-6251142101352
Schwarzbözl, PeterUNSPECIFIEDhttps://orcid.org/0000-0001-9339-7884UNSPECIFIED
Birkigt, LisaExentis Technology GmbH, Otto-Schott-Straße 15, 07745 Jena, GermanyUNSPECIFIEDUNSPECIFIED
Vasic, SrdanExentis Technology GmbH, Otto-Schott-Straße 15, 07745 Jena, GermanyUNSPECIFIEDUNSPECIFIED
Dung, SebastianVitesco Technologies Emitec GmbH, Hauptstraße 128, 53797 Lohmar, GermanyUNSPECIFIEDUNSPECIFIED
Doerbeck, TillKraftanlagen Energies & Services GmbH, Ridler Straße 31c, 80339 München, GermanyUNSPECIFIEDUNSPECIFIED
Date:24 August 2023
Journal or Publication Title:Renewable Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Concentrated solar power, Open volumetric receiver, Porous absorbers, Experimental efficiency evaluation
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Smart Operation
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Broeske, Robin Tim
Deposited On:11 Sep 2023 10:01
Last Modified:11 Sep 2023 10:01

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