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High carnallite-bearing material for thermochemical energy storage: Thermophysical characterization

Gutierrez Rojas, Andrea Lucia and Ushak, Svetlana and Linder, Marc Philipp (2018) High carnallite-bearing material for thermochemical energy storage: Thermophysical characterization. ACS Sustainable Chemistry and Engineering, 6 (5), pp. 6135-6145. American Chemical society (ACS). doi: 10.1021/acssuschemeng.7b04803. ISSN 2168-0485.

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Official URL: https://pubs.acs.org/doi/10.1021/acssuschemeng.7b04803


Thermochemical energy storage has a high material-related energy density and low energy losses over time compared to sensible and latent energy storage. Considering economic and ecological aspects, there is a great opportunity in using low cost or even waste materials from the mining industry, as thermochemical energy storage medium. In this study, a systematic analysis of a high carnallite-bearing material, comparable to the natural waste, for thermochemical energy storage was performed. The material displays gradual decomposition and poor reversibility of hydration reaction at temperatures above 150°C. However, the reversibility is significantly higher and the decomposition is slower between 100°C and 150°C under pH2O=25 kPa. The reversible behavior of hydration reaction of carnallite, between 100°C and 150°C, is stable for 15 cycles when the material is exposed at 150°C for short periods of time (t < 20 min). Following this path, any potential application of this material is definitely limited to low temperature thermal storage or thermal upgrade. Taking the low material cost into account one of the potential applications of this material could be in the context of long-term heat storage. For this purpose, the temperatures of dehydration can be below 150°C and the temperatures of rehydration close to 40°C.

Item URL in elib:https://elib.dlr.de/119560/
Document Type:Article
Title:High carnallite-bearing material for thermochemical energy storage: Thermophysical characterization
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gutierrez Rojas, Andrea LuciaAndrea.GutierrezRojas (at) dlr.dehttps://orcid.org/0000-0002-6313-8264
Ushak, Svetlanasvetlana.ushak (at) uantof.clUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Date:23 March 2018
Journal or Publication Title:ACS Sustainable Chemistry and Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1021/acssuschemeng.7b04803
Page Range:pp. 6135-6145
EditorsEmailEditor's ORCID iD
Allen, Davidallen@sustain.acs.orgUNSPECIFIED
Publisher:American Chemical society (ACS)
Series Name:ACS Publications
Keywords:Thermochemical energy storage; low-cost material; salt hydrates; potassium carnallite; magnesium chloride hexahydrate; solid-gas reaction
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: Gutierrez Rojas, Andrea Lucia
Deposited On:16 Jul 2018 16:40
Last Modified:01 Oct 2019 03:00

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