Volume 5, 2018
|Number of page(s)||10|
|Published online||01 June 2018|
Green chemistry solutions for sol–gel micro-encapsulation of phase change materials for high-temperature thermal energy storage
INESCOP, Centre for Technology and Innovation,
2 National R&D Institute for Nonferrous and Rare Metals, 102 Biruintei Blvd, Pantelimon, Ilfov, Romania
* e-mail: email@example.com
Accepted: 18 January 2018
NaNO3 has been selected as phase change material (PCM) due to its convenient melting and crystallization temperatures for thermal energy storage (TES) in solar plants or recovering of waste heat in industrial processes. However, incorporation of PCMs and NaNO3 in particular requires its protection (i.e. encapsulation) into containers or support materials to avoid incompatibility or chemical reaction with the media where incorporated (i.e. corrosion in metal storage tanks). As a novelty, in this study, microencapsulation of an inorganic salt has been carried out also using an inorganic compound (SiO2) instead of the conventional polymeric shells used for organic microencapsulations and not suitable for high temperature applications (i.e. 300–500 °C). Thus, NaNO3 has been microencapsulated by sol–gel technology using SiO2 as shell material. Feasibility of the microparticles synthetized has been demonstrated by different experimental techniques in terms of TES capacity and thermal stability as well as durability through thermal cycles. The effectiveness of microencapsulated NaNO3 as TES material depends on the core:shell ratio used for the synthesis and on the maximum temperature supported by NaNO3 during use.
Key words: thermal energy storage / microencapsulation / sol–gel / inorganic salt / phase change material / NaNO3 / concentrated solar power
© M.D. Romero-Sanchez et al., Published by EDP Sciences 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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