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Mn-based combined oxide systems and porous structures for hybrid sensible / thermochemical solar energy storage in air-operated solar thermal power plants

Agrafiotis, Christos and Block, Tina and Tescari, Stefania and Roeb, Martin and Sattler, Christian (2017) Mn-based combined oxide systems and porous structures for hybrid sensible / thermochemical solar energy storage in air-operated solar thermal power plants. 12th Pacific Rim Conference on Ceramic and Glass Technology, 21.-26. Mai 2017, Waikoloa, USA.

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Official URL: http://ceramics.org/meetings/pacrim12

Abstract

The concept of regenerative sensible heat storage in porous solids employed in air-operated solar thermal power plants can be hybridized with thermochemical storage by coating/manufacturing entirely the heat exchange modules with oxides of multivalent metals undergoing reduction/oxidation reactions with significant heat effects. In this perspective a specific Mn2O3-Fe2O3 composition and CaMn1-xBxO3-δ perovskites doped in the B site with Ti, Al or Mg were investigated. The work involved the feasibility of shaping the powders to porous foams which, together with pellets, were comparatively tested to clarify the effect of structure porosity on redox performance. The Mn2O3-Fe2O3 composition underwent cyclic, reproducible reduction/oxidation with significant reaction enthalpies within a wide range of heating/cooling rates, even in the form of foams that maintained their structural integrity. The attribute of perovskites for continuous, quasi-linear oxygen uptake/release can be beneficial to hybridization of thermochemical with sensible storage within a wider temperature range. Addition of Ti was found to improve the perovskites’ long-term redox stability. However the induced heat effects of the perovskites’ redox reactions were substantially lower and need to be improved for commercial-scale applications.

Item URL in elib:https://elib.dlr.de/117151/
Document Type:Conference or Workshop Item (Speech)
Title:Mn-based combined oxide systems and porous structures for hybrid sensible / thermochemical solar energy storage in air-operated solar thermal power plants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Block, TinaTina.Block (at) dlr.deUNSPECIFIED
Tescari, StefaniaStefania.Tescari (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:21 May 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermochemical storage, redox oxides, ceramic foams, perovskites
Event Title:12th Pacific Rim Conference on Ceramic and Glass Technology
Event Location:Waikoloa, USA
Event Type:international Conference
Event Dates:21.-26. Mai 2017
Organizer:The American Ceramic Society
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:18 Dec 2017 11:58
Last Modified:18 Dec 2017 11:58

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