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Cobalt oxide-based structured thermochemical reactors/heat exchangers for solar thermal energy storage in Concentrated Solar Power plants

Agrafiotis, Christos and Roeb, Martin and Sattler, Christian (2014) Cobalt oxide-based structured thermochemical reactors/heat exchangers for solar thermal energy storage in Concentrated Solar Power plants. In: Proceedings ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology, ES2014-6336 pp. V001T02A005; (8 pages). ASME. ASME 2014 8th International Conference on Energy Sustainability (ES2014), 30. Jun. - 02. Jul. 2014, Boston, MA, USA. DOI: 10.1115/ES2014-6336 ISBN 978-0-7918-4586-8

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Abstract

Based on the characteristics of the oxide redox pair system 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 ceramic structures coated with or manufactured entirely from a redox material like Co3O4, has been implemented. Thermo-Gravimetric Analysis (TGA) experiments have demonstrated that laboratory-scale Co3O4-coated, redox-inert ceramic foams and honeycombs exhibited repeatable, cyclic reduction-oxidation operation within the temperature range 800-1000oC, employing all the redox material incorporated, even at loading levels exceeding 100 wt% loading percentages. To further improve the volumetric heat storage capacity, monolithic porous ceramic foams made entirely of Co3O4 were manufactured, together with analogous pellets. Such porous structures were also capable of cyclic reduction–oxidation, exploiting the entire amount of Co3O4 used in their manufacture. In this perspective, “open” porous structures like the ones of ceramic foams seem to have significant Advantages in addressing problems associated with cyclic expansioncontraction that could be detrimental to structural integrity.

Item URL in elib:https://elib.dlr.de/91449/
Document Type:Conference or Workshop Item (Speech)
Title:Cobalt oxide-based structured thermochemical reactors/heat exchangers for solar thermal energy storage in Concentrated Solar Power plants
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:30 June 2014
Journal or Publication Title:Proceedings ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1115/ES2014-6336
Page Range:ES2014-6336 pp. V001T02A005; (8 pages)
Publisher:ASME
ISBN:978-0-7918-4586-8
Status:Published
Keywords:Cobalt , Heat exchangers , Solar thermal power , Concentrating solar power , Storage , Ceramic foam , oxidation , Heat storage , Ceramics , Heat , Temperature , Foams (Chemistry) thermochemical cycles heat storage
Event Title:ASME 2014 8th International Conference on Energy Sustainability (ES2014)
Event Location:Boston, MA, USA
Event Type:international Conference
Event Dates:30. Jun. - 02. Jul. 2014
Organizer:American Society of Mechanical Engineers
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 16:34
Last Modified:08 Jan 2015 09:20

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