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Numerical modeling and experimental validation of a solar thermochemical energy storage reactor

Singh, Abhishek Kumar and Tescari, Stefania and Lantin, Gunnar and Lange, Matthias and Agrafiotis, Christos and Roeb, Martin and Sattler, Christian (2016) Numerical modeling and experimental validation of a solar thermochemical energy storage reactor. ASME 8th International Conference on Power Energy 2016, 26.-30. Jun. 2016, Charlotte, USA.

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Abstract

Thermochemical energy storage (TCES) systems utilize reversible reactions to store solar energy in chemical form. Several reversible systems such as oxides carbonation/decarbonation, ammonia-based cycle, hydroxide systems, organic and redox cycles are currently under study. In the aforementioned systems, reactive materials are mainly in the form of fluid or powders. The present work focuses on the cobalt oxide (Co3O4/CoO pair) based redox cycle in which cobalt 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 test facility of Solar Tower Jülich, 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 (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 understand the effect of variation of boundary conditions on the system.

Item URL in elib:https://elib.dlr.de/108884/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical modeling and experimental validation of a solar thermochemical energy storage reactor
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
Lange, MatthiasMatthias.Lange (at) dlr.dehttps://orcid.org/0000-0003-4747-0010
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:28 June 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermochemical energy storage, numerical modeling
Event Title:ASME 8th International Conference on Power Energy 2016
Event Location:Charlotte, USA
Event Type:international Conference
Event Dates:26.-30. Jun. 2016
Organizer:ASME American Society of Mechanical Engineers
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:05 Dec 2016 12:40
Last Modified:05 Dec 2016 12:40

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