Mixed inorganic hydrate salts as sustainable thermal energy storage technology: Synthesis and thermal behavior investigation

5^th International Conference on Organic and Inorganic Chemistry

July 12-13, 2018 | Paris, France

H Ait Ousaleh, A Zaki, A Faik and A El Bouari

University Hassan II of Casablanca, Morocco
CIC EnergiGUNE, Spain

Posters & Accepted Abstracts: J Chemical Sci

Abstract :

Thermochemical energy storage is a qualified indirect storage. In contrast to sensible or latent heat storage, energy is stored through a physico-chemical process that consumes energy during the charging (dehydration) phase and releases it during the discharging (hydration) phase. It is not directly accessible, which has the advantage of not causing significant losses. Hydrate salts used for thermal energy storage have been always attracting topic within the research community thanks to their good performance on energy conservation applied for energy efficiency in buildings, such applications as solar domestic hot water systems. Thermochemical storage materials (TCMs) should have a high-energy storage density, multiple sources, rational price and relatively good thermal conductivity. This characteristic make of hydrate salts a worthy candidate used for heat storage. This study is focused on development of new mixed hydrated salts in order to explore new temperature range by means of salts incorporated. For the present work, structural and thermal investigations of bl�¶dite-type structure Na2M (SO4)2.4H2O (M=Zn, Mg) and Kr�¶hnkite compounds Na2Cu (SO4)2.2H2O are reported. The preliminary results show a complete reversibility of mixed salts confirmed by XRD, FTIR and Raman spectroscopy. On other hand, the thermal analyses show different dehydration temperatures for each material. The mechanism and kinetics of dehydration/hydration reactions under water vapor sorption measurements were studied as well as the thermal efficiency to evaluate the promising salt for solar domestic hot water systems application.