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Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation

Stengler, Jana and Bürger, Inga and Linder, Marc (2020) Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation. Applied Energy, 277 (115432). Elsevier. doi: 10.1016/j.apenergy.2020.115432. ISSN 0306-2619.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0306261920309442?via%3Dihub

Abstract

The potential of thermochemical energy storage and heat transformation has been soundly highlighted in literature. For applications in the temperature range from approximately 150 °C to 300 °C, the inorganic salt strontium bromide, which reacts with water vapor in an exothermic reaction, is a promising candidate: SrBr2 (s) + H2O (g) ⇌ SrBr2·H2O (s) + ΔRH. This chemical reaction offers a specific energy density of 291 kJ/kg SrBr2 (or 81 kWh/t). The feasibility of a thermochemical energy storage and heat transformer based on the SrBr2/H2O working pair has already been successfully demonstrated on a 1 kW scale in a lab-scale storage unit. Here, we report on the steam pressure-dependent reaction temperatures of the dehydration and hydration reactions as well as the reaction rate and the cycle stability of the reactive system over 100 reaction cycles using thermogravimetric analysis. For distinct operating points, e.g. running the hydration reaction at 180 °C and 69 kPa, specific thermal powers up to 4 kW/kg SrBr2 were experimentally determined. Running the dehydration reaction at 210 °C and 5 kPa steam pressure showed specific thermal powers of 2.5 kW/kg of SrBr2·H2O, thus proving the suitability of SrBr2/H2O as thermochemical working pair for high-power storage applications. Our results provide fundamental material-related data for the design of high-power reactor modules as well as for numerical studies on the potential of thermochemical energy storage and heat transformation based on SrBr2/H2O.

Item URL in elib:https://elib.dlr.de/135638/
Document Type:Article
Title:Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Date:25 July 2020
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:277
DOI :10.1016/j.apenergy.2020.115432
Publisher:Elsevier
ISSN:0306-2619
Status:Published
Keywords:Thermochemical energy storage, Heat transformation, Strontium bromide, Thermodynamic equilibrium, Thermal hysteresis, Gas–solid reaction kinetics
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Stengler, Jana
Deposited On:07 Dec 2020 12:10
Last Modified:07 Dec 2020 12:10

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