Abstract

MILIAN, Yanio E.  and  USHAK, Svetlana. Development of shape stabilized thermal energy storage materials based on inorganic chloride salts by direct sol-gel method. RevActaNova. [online]. 2020, vol.9, n.5-6, pp.754-772. ISSN 1683-0789.

The potential of several improved materials was analyzed for thermal energy storage in this work, specifically for latent heat storage (LHS) and for thermochemical energy storage (TCS). The use of a direct sol-gel process, using tetraethyl orthosilicate as monomer, was applied to obtain shape stabilized -thermal energy storage materials (SS-TES material) based on different inorganic salts (MgCl₂·6H₂O, MnCL and LiCl) and wastes from non-metallic mining industry: bischofite (95% of MgCl₂·6H₂O) and carnallite (73% of KCl-MgCl₂·6H₂O). A detailed analysis was offered for the developed materials based on x-ray diffraction, scanning electronic microscopy and thermal analyses. A new low-cost material of carnallite/SiO₂ showed an atypical absorption peak at 50 °C, which increase with the content of carnallite in the final material, indicating a possible potential as a thermochemical storage medium, for low temperature applications, below 100 °C. However, the application of the sol-gel method under the conditions studied in this work did not allow to obtain SS-TES materials based on MgCl₂·6H₂O, MnCl₂ and carnallite for LHS, which indicates that future adjustments are necessary to obtain satisfactory results.

Keywords : shape stabilized thermal energy storage materials; bischofite; carnallite; sol-gel; tetraethyl orthosilicate; silicon dioxide.

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