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A solar receiver-storage modular cascade based on porous ceramic structures for hybrid sensible/thermochemical solar energy storage

Agrafiotis, Christos and de Oliveira, Lamark and Roeb, Martin and Sattler, Christian (2015) A solar receiver-storage modular cascade based on porous ceramic structures for hybrid sensible/thermochemical solar energy storage. In: SolarPACES 2015 Book of Abstracts, pp. 323-324. SolarPACES 2015, 13.-16. Okt. 2015, Kapstadt, Südafrika.

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Abstract

The current state-of-the-art solar heat storage concept in air-operated Solar Tower Power Plants is to store the solar energy provided during on-sun operation as sensible heat in porous solid materials that operate as recuperators during off-sun operation. The technology is operationally simple; however its storage capacity is limited to 1.5 hours. An idea for extending this capacity is to render this storage concept from “purely” sensible to “hybrid” sensible/ thermochemical one, via coating the porous heat exchange modules with oxides of multivalent metals for which their reduction/oxidation reactions are accompanied by significant heat effects, or by manufacturing them entirely of such oxides. In this way solar heat produced during on-sun operation can be used (in addition to sensibly heating the porous solid) to power the endothermic 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. Such sensible and thermochemical storage concepts were tested on a solar-irradiated receiver–heat storage module cascade for the first time. Parametric studies performed so far involved the comparison of three different SiC-based receivers with respect to their capability of supplying solar-heated air at temperatures sufficient for the reduction of the oxides, the effect of air flow rate on the temperatures achieved within the storage module, as well as the comparison of different porous storage media made of cordierite with respect to their sensible storage capacity.

Item URL in elib:https://elib.dlr.de/99233/
Document Type:Conference or Workshop Item (Speech)
Title:A solar receiver-storage modular cascade based on porous ceramic structures for hybrid 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.deUNSPECIFIED
Date:15 October 2015
Journal or Publication Title:SolarPACES 2015 Book of Abstracts
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 323-324
Status:Published
Keywords:Solar thermal power Generation, heat storage, thermochemical cycles, metal oxide,
Event Title:SolarPACES 2015
Event Location:Kapstadt, Südafrika
Event Type:international Conference
Event Dates:13.-16. Okt. 2015
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:06 Nov 2015 15:14
Last Modified:06 Nov 2015 15:14

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