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Solar thermochemical heat storage via the Co3O4/CoO looping cycle: Storage reactor modelling and experimental validation

Singh, Abhishek Kumar and Tescari, Stefania and Lantin, Gunnar and Agrafiotis, Christos and Roeb, Martin and Sattler, Christian (2017) Solar thermochemical heat storage via the Co3O4/CoO looping cycle: Storage reactor modelling and experimental validation. Solar Energy, 144, pp. 453-465. Elsevier. DOI: 10.1016/j.solener.2017.01.052 ISSN 0038-092X

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Official URL: http://www.sciencedirect.com/science/article/pii/S0038092X17300713

Abstract

Thermochemical energy storage (TCES) systems utilize reversible reactions to store solar energy in chemical form. The present work focuses on the cobalt/cobaltous oxide (Co3O4/CoO pair) based redox cycle in which the active oxide is coated on a cordierite honeycomb structure. During the redox cycle, cobalt oxide uptakes and releases oxygen from/to an air stream coming in direct contact with it. Thus air acts as a reaction medium as well as a heat transfer fluid (HTF). In this configuration, the storage material works as a heat storage medium and also a heat exchanger. A two-dimensional, axisymmetric numerical model to simulate the heat and mass transfer and the chemical reaction in the thermochemical heat storage reactor has been developed. Experimental results from a 74 kWhth-capacity prototype reactor installed at the Solar Tower Jülich test facility, Germany, were used to validate the numerical model. The time-dependent boundary conditions in the form of inlet temperature and inlet mass flow rate from the experiments were employed in the numerical model. The temperatures of the redox material at different locations inside the prototype thermochemical storage/heat exchanger reactor were used for the numerical model validation. Total energy stored/released (sensible as well as chemical) during the experiments was also compared with the numerical model results. From this study, it is concluded that the numerical model can accurately predict charging/discharging processes for the cobalt oxide based thermochemical storage reactor system for multiple redox looping cycles. The model allows a better understanding of the complete process and helps to identify the effect of variation of boundary conditions on the system.

Item URL in elib:https://elib.dlr.de/111126/
Document Type:Article
Title:Solar thermochemical heat storage via the Co3O4/CoO looping cycle: Storage reactor modelling and experimental validation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Singh, Abhishek KumarAbhishek.Singh (at) dlr.deUNSPECIFIED
Tescari, StefaniaStefania.Tescari (at) dlr.deUNSPECIFIED
Lantin, GunnarGunnar.Lantin (at) dlr.deUNSPECIFIED
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:23 January 2017
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:144
DOI :10.1016/j.solener.2017.01.052
Page Range:pp. 453-465
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Thermochemical heat storage Prototype reactor Numerical model Experimental validation Co3O4
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: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:22 May 2017 15:05
Last Modified:22 May 2017 15:05

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