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Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods

Stengler, Jana and Bürger, Inga and Linder, Marc Philipp (2021) Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods. International Journal of Heat and Mass Transfer, 167 (120797). Elsevier. doi: 10.1016/j.ijheatmasstransfer.2020.120797. ISSN 0017-9310.

[img] PDF - Only accessible within DLR bis April 2024 - Postprint version (accepted manuscript)

Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0017931020337352?via%3Dihub


Thermochemical energy storage is not only discussed for the long-term storage of thermal energy with large capacities, but also for applications requiring high specific thermal powers, e.g. the thermal upgrade of waste heat via thermochemical heat transformers in continuous operation. Our work aims at the quantitative analysis of the dominating processes in storage designs for gas-solid reactions, which specifically target high-power applications. As reference storage design, we chose a 1 kW prototype featuring axial aluminum fins for an increased effective bulk conductivity. It was operated with strontium bromide, which reacts with steam in a reversible gas-solid reaction in the 160 – 320 °C temperature range, reaching specific thermal powers up to 250 W/kg anhydrous salt. By combining our experimental work with numerical studies based on the finite element method, we quantitatively evaluate the influence of the heat transfer-related parameters on the storage’s maximum thermal power. Based on a thermal sensitivity study, the largest contributor turns out to be the heat transfer coefficient between the reactive bulk phase and the heat exchanger. The experimentally validated simulation tool allows us to draw further conclusions on the scale-up of the current storage design for large-scale applications. In particular, it provides the necessary data to estimate the exergy efficiency of a broad variety of storage application scenarios of the investigated storage system.

Item URL in elib:https://elib.dlr.de/142058/
Document Type:Article
Title:Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods
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.dehttps://orcid.org/0000-0002-6091-0431
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Date:March 2021
Journal or Publication Title:International Journal of Heat and Mass Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijheatmasstransfer.2020.120797
Keywords:Thermochemical energy storage; heat transformation; strontium bromide
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Stengler, Jana
Deposited On:23 Dec 2021 15:33
Last Modified:24 May 2022 23:47

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