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Non-Stoichiometric Redox Thermochemical Energy Storage Analysis for High Temperature Applications

Roeder, Timo and Risthaus, Kai and Monnerie, Nathalie and Sattler, Christian (2022) Non-Stoichiometric Redox Thermochemical Energy Storage Analysis for High Temperature Applications. Energies, 15 (5982). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/en15165982. ISSN 1996-1073.

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Official URL: https://www.mdpi.com/1996-1073/15/16/5982


Concentrated solar power is capable of providing high-temperature process streams to different applications. One promising application is the high-temperature electrolysis process demanding steam and air above 800 °C. To overcome the intermittence of solar energy, energy storage is required. Currently, thermal energy at such temperatures can be stored predominately as sensible heat in packed beds. However, such storage suffers from a loss of usable storage capacity after several cycles. To improve such storage, a one-dimensional packed bed thermal energy storage model using air as a heat transfer medium is set up and used to investigate and quantify the benefit of the incorporation of different thermochemical materials from the class of perovskites. Perovskites undergo a non-stoichiometric reaction extension which offers the utilization of thermochemical heat over a larger temperature range. Three different perovskites were considered: SrFeO3, CaMnO3 and Ca0.8Sr0.2MnO3. In total, 15 vol% of sensible energy storage has been replaced by one perovskite and different positions of the reactive material are analyzed. The effect of reactive heat on storage performance and thermal degradation over 15 consecutive charging and discharging cycles is studied. Based on the selected variation and reactive material, storage capacity and useful energy capacity are increased. The partial replacement close to the cold inlet/outlet of the storage system can increase the overall storage capacity by 10.42%. To fully utilize the advantages of thermochemical material, suitable operation conditions and a fitting placement of the material are vital.

Item URL in elib:https://elib.dlr.de/192115/
Document Type:Article
Title:Non-Stoichiometric Redox Thermochemical Energy Storage Analysis for High Temperature Applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sattler, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-4314-1124UNSPECIFIED
Date:18 August 2022
Journal or Publication Title:Energies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:thermal energy storage; thermochemical energy; packed bed; perovskites; solar energy
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Jülich , Köln-Porz
Institutes and Institutions:Institute of Future Fuels
Institute of Future Fuels > Solar Production Assessment
Deposited By: Bülow, Mark
Deposited On:14 Dec 2022 09:34
Last Modified:14 Dec 2022 09:34

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