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Redox-oxide-based modular structures of porous ceramic foams and honeycombs for efficient sensible/thermochemical solar energy storage

Agrafiotis, Christos and de Oliveira, Lamark and Roeb, Martin and Sattler, Christian (2016) Redox-oxide-based modular structures of porous ceramic foams and honeycombs for efficient sensible/thermochemical solar energy storage. 6th International Congress on Ceramics, 21.-25. Aug. 2016, Dresden, Deutschland.

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Abstract

The current, sensible regenerative heat storage in porous solid materials in air-operated solar thermal plants can be hybridized with thermochemical storage within the same volume via coating the heat exchange modules with oxides of multivalent metals undergoing reduction/oxidation reactions accompanied by heat effects (e.g. Co3O4/CoO, Mn2O3/Mn3O4) or by manufacturing them entirely of such oxides. In this way solar-heated air from the receiver in addition to sensibly heating the porous solid can induce the endothermic chemical reduction of the oxide from its state with the higher metal valence to that of the lower; the thermal energy can be entirely recovered by the reverse exothermic oxidation reaction (in addition to sensible heat) during off-sun operation. The construction modularity of these systems provides for the design of the entire storage reactor/heat exchanger as a structure with rational 3-D spatial variation of redox oxide materials chemistry and solid material porosity, tailored to the local temperature and flow conditions, to enhance the utilization of the heat transfer fluid and the storage of its enthalpy. Comparative sensible-only and sensible-thermochemical storage studies on a variety of redox-oxide-coated porous ceramic honeycomb and foam cascades have been performed from laboratory test rigs up to the level of a solar-irradiated receiver–heat storage module combination. The effects of oxide composition and porous support on heat storage efficiency, process cyclability and system longevity are presented and discussed in conjunction to issues for further research.

Item URL in elib:https://elib.dlr.de/108879/
Document Type:Conference or Workshop Item (Speech)
Title:Redox-oxide-based modular structures of porous ceramic foams and honeycombs for efficient sensible/thermochemical solar energy storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
de Oliveira, Lamarklamark.de-oliveira (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:24 August 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermochemical heat storage, sensible heat storage, redox cycles, oxide ceramics, porous ceramics
Event Title:6th International Congress on Ceramics
Event Location:Dresden, Deutschland
Event Type:international Conference
Event Dates:21.-25. Aug. 2016
Organizer:International Ceramic Federation (ICF)
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Fuels (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:05 Dec 2016 12:40
Last Modified:05 Dec 2016 12:40

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