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Experimental evaluation of a pilot-scale thermochemical storage System for a concentrated solar power plant

Tescari, Stefania and Singh, Abhishek Kumar and Agrafiotis, Christos and de Oliveira, Lamark and Breuer, Stefan and Schlögl-Knothe, Bärbel and Roeb, Martin and Sattler, Christian (2017) Experimental evaluation of a pilot-scale thermochemical storage System for a concentrated solar power plant. Applied Energy, 189, pp. 66-75. Elsevier. doi: 10.1016/j.apenergy.2016.12.032. ISSN 0306-2619.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0306261916317950


A first of its kind pilot-scale redox-based thermochemical storage system has been set up and operated under near-realistic conditions inside a solar power tower plant. The storage unit is made of inert honeycomb supports (cordierite) coated with 88 kg of redox active material (cobalt oxide). An experimental campaign has been carried out consisting of 22 thermochemical charge-discharge cycles. The heat absorbed or released by the chemical reaction became clearly evident through the temperature Evolution inside the reactive material. It allows to store or release energy at constant temperature when crossing respectively the reduction/oxidation temperature of the Co3O4/CoO pair. A storage performance factor (PF) was defined to evaluate how each experiment approaches the ideal behavior. During the complete campaign no measurable cycle-to-cycle degradation was observed and the system average capacity was very close to the ideal case of PF = 0.84. The advantage of thermochemical storage could be quantified by comparing the storage capacity, to that of a sensible-only storage unit made of uncoated cordierite honeycombs. The thermochemical system offered almost double storage capacity (47.0 kW h) cf. the same volume of the sensible-only case (25.3 kW h).

Item URL in elib:https://elib.dlr.de/110332/
Document Type:Article
Title:Experimental evaluation of a pilot-scale thermochemical storage System for a concentrated solar power plant
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Tescari, StefaniaStefania.Tescari (at) dlr.deUNSPECIFIED
Singh, Abhishek KumarAbhishek.Singh (at) dlr.deUNSPECIFIED
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
de Oliveira, Lamarklamark.de-oliveira (at) dlr.deUNSPECIFIED
Breuer, StefanStefan.Breuer (at) dlr.deUNSPECIFIED
Schlögl-Knothe, Bärbelbaerbel.schloegl (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:January 2017
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.apenergy.2016.12.032
Page Range:pp. 66-75
Keywords:Concentrated solar energy, Energy storage, thermochemical storage, Cobalt oxide, Redox cycles, Pilot-scale system
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: Jülich , Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Institute of Solar Research > Großanlagen und solare Materialien
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:11 Jan 2017 15:11
Last Modified:20 Jun 2021 15:48

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