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Development of low-cost inorganic salt hydrate as a thermochemical energy storage material

Mamani, V und Gutierrez Rojas, Andrea Lucia und Ushak, S (2018) Development of low-cost inorganic salt hydrate as a thermochemical energy storage material. Solar Energy Materials and Solar Cells. Elsevier. doi: 10.1016/j.solmat.2017.10.021. ISSN 0927-0248.

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Offizielle URL: https://www.journals.elsevier.com/solar-energy-materials-and-solar-cells

Kurzfassung

Thermochemical storage is based on a reversible chemical reaction; energy can be stored when an endothermic chemical reaction occurs and then, energy is released when it is reversed in an exothermic reaction. According to literature and based on the energy storage density (esd), MgCl2·6H2O is a promising candidate material for thermochemical energy storage. Bischofite is an inorganic salt obtained as a by-product material from extraction processes of non-metallic minerals, from Salar de Atacama in Chile, containing approximately 95% of MgCl2·6H2O. Thus, the purpose of this study was to characterize the dehydration reaction of bischofite ore, studied as a low-cost thermochemical storage material. Thermogravimetric data for bischofite were obtained using a TGA instrument coupled to a DSC, at four different isotherms 70 °C, 80 °C, 90 °C and 100 °C. The results of conversion reaction (alpha-t) from the thermal dehydration experiments, demonstrated the first phase of dehydration with the loss of two water molecules. The study showed a typical sigmoid curve with a significant acceleration in the conversion at the beginning of the reaction until it reaches a maximum rate, where the curve keeps constant. The same behavior was observed for all the temperatures used. The kinetics of bischofite dehydration model was determined using the isothermal kinetics method. For this, the thermogravimetric data were fitted to the most used kinetic models (D, F, R, A) and then their respective correlation coefficients R were evaluated. The results indicated that the dehydration reaction of bischofite was described by the kinetics of chemical reaction of cylindrical particles R2. The rate of dehydration reaction and esd of bischofite are lower as compared to synthetic MgCl2·6H2O, at temperatures higher than 80 °C. However, the cost of materials to store 1 MJ of energy is three times lower for bischofite, which is an evident advantage to promote the reuse of this material left as waste by the non-metallic industry.

elib-URL des Eintrags:https://elib.dlr.de/116536/
Dokumentart:Zeitschriftenbeitrag
Titel:Development of low-cost inorganic salt hydrate as a thermochemical energy storage material
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Mamani, VUniversity of AntofagastaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gutierrez Rojas, Andrea LuciaAndrea.GutierrezRojas (at) dlr.dehttps://orcid.org/0000-0002-6313-8264NICHT SPEZIFIZIERT
Ushak, Ssvetlana.ushak (at) uantof.clNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2018
Erschienen in:Solar Energy Materials and Solar Cells
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1016/j.solmat.2017.10.021
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
Lampert, CarlNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verlag:Elsevier
ISSN:0927-0248
Status:veröffentlicht
Stichwörter:Thermochemical storage material; Bischofite; Isothermal kinetics; Dehydration reaction; Salt hydrate
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Thermische Energiespeicher
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse (Speicher) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Gutierrez Rojas, Andrea Lucia
Hinterlegt am:16 Jan 2018 15:34
Letzte Änderung:23 Jul 2022 13:44

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