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/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Title: | Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation | ||||||||||||
Authors: |
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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) | ||||||||||||
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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