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Hybrid sensible/thermochemical solar energy storage concepts based on porous ceramic structures and redox pair oxides chemistry

Agrafiotis, Christos and Roeb, Martin and Sattler, Christian (2014) Hybrid sensible/thermochemical solar energy storage concepts based on porous ceramic structures and redox pair oxides chemistry. In: SolarPACES 2014 Book of Abstracts, pp. 367-368. SolarPACES 2014, 16.-19. Sep. 2014, Beijing, China.

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Official URL: http://www.solarpaces2014.solarpaces.org/cms/home.html

Abstract

The enthalpy effects of reversible chemical reactions can be exploited for the so-called thermochemical storage of solar energy. Oxides of multivalent metals in particular, capable of being reduced and oxidized under air atmosphere with significant heat effects are perfect candidates for air-operated Concentrated Solar Power plants since in this case air can be used as both the heat transfer fluid and the reactant (O2) and therefore can come to direct contact with the storage material (oxide). Based on the characteristics of the oxide redox pair Co3O4/CoO as a thermochemical heat storage medium and the advantages of porous ceramic structures like honeycombs and foams in heat exchange applications, the idea of employing such structures either coated with or entirely made of a redox material like Co3O4, as a hybrid sensible-thermochemical solar energy storage system in air-operated Concentrated Solar Power plants has been set forth and tested. At first, small-scale, redox-inert, cordierite foams and honeycombs were coated with Co3O4 and tested for cyclic reduction-oxidation operation in Thermo-Gravimetric Analysis studies. Such Co3O4-coated supports exhibited repeatable, cyclic reduction-oxidation operation within the temperature range 800-1000oC for many cycles, employing all the redox material incorporated, even at very high redox oxide loading levels. To further improve the volumetric heat storage capacity of such reactors, monolithic porous ceramic foams made entirely of Co3O4 were manufactured. Such foams sintered at 1300oC exhibited satisfactory structural integrity and were comparatively tested vs. the “plain” Co3O4 powder and the Co3O4-coated, porous cordierite supports under the same cyclic redox conditions up to 15 consecutive cycles. The Co3O4-made porous foams were proved also capable of cyclic reduction–oxidation, exploiting the entire amount of Co3O4 used in their manufacture, maintaining simultaneously their structural integrity.

Item URL in elib:https://elib.dlr.de/91443/
Document Type:Conference or Workshop Item (Speech)
Title:Hybrid sensible/thermochemical solar energy storage concepts based on porous ceramic structures and redox pair oxides chemistry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Agrafiotis, Christoschristos.agrafiotis (at) dlr.deUNSPECIFIED
Roeb, Martinmartin.roeb (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Date:16 September 2014
Journal or Publication Title:SolarPACES 2014 Book of Abstracts
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 367-368
Editors:
EditorsEmail
Wang, ZhifengUNSPECIFIED
Status:Published
Keywords:solar energy thermochemical heat storage redox reactions cobalt oxide structured reactors ceramic honeycombs ceramic foams
Event Title:SolarPACES 2014
Event Location:Beijing, China
Event Type:international Conference
Event Dates:16.-19. Sep. 2014
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Process Technology (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:05 Nov 2014 15:42
Last Modified:05 Nov 2014 15:42

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