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Operation strategies for gas solid reactions in thermal energy storage systems

Bürger, Inga and Linder, Marc Philipp (2021) Operation strategies for gas solid reactions in thermal energy storage systems. Journal of Energy Storage, 40, p. 102767. Elsevier. ISSN 2352-152X.

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Official URL: https://doi.org/10.1016/j.est.2021.102767


Thermochemical energy storages are so far considered and operated as passive systems, where the mass flow rate and the temperature of the heat transfer fluid determine the resulting thermal power. However, the basic storage principle is a gas solid reaction that can in general be looked at from two different perspectives: Not only by the thermochemical energy storage perspective, but by a gas storage perspective. The latter is based on a rather active gas flow-controlled strategy, that is e.g. very common for gaseous hydrogen storage in solid state reactions. In this manuscript, this gas flow-controlled strategy is transferred to thermochemical energy storage applications and its impact on flexibility of storage operation is discussed. First, using analytical expressions, an equation characterizing the thermal power limit of a plate type reactor is deduced and the two operation regimes are described. Second, using simulations, the behavior of a thermochemical energy storage that is controlled not only by the heat transfer fluid, but also by the released gas flow rate is analyzed. It is shown that the control strategy can lead to significantly different profiles for temperature and pressure inside of the reactor. Especially the axially dominated profiles for the passive, step-response like, systems differ from rather radial temperature and conversion profiles for the gas-controlled, active, operation. These findings are crucial in the context of part-load operations and open new possibilities for the design and control of thermal energy storage systems based on thermochemical gas solid reactions.

Item URL in elib:https://elib.dlr.de/143138/
Document Type:Article
Title:Operation strategies for gas solid reactions in thermal energy storage systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Energy Storage
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 102767
Keywords:Thermochemical energy storage Operation strategy Gas flow control Metal hydride Gas solid reaction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bürger, Inga
Deposited On:29 Oct 2021 11:09
Last Modified:05 Nov 2021 11:18

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