Characterization of wastes based on inorganic double salt hydrates as potential thermal energy storage materials
MetadataShow full item record
Thermal energy storage (TES) is seen today as a key technology to reduce the existing gap between energy demand and energy supply in many energy systems. There are, currently, three well known methods to store thermal energy and they are: sensible heat storage (SHS), latent heat storage (LHT) and thermochemical heat storage. Every method has its own thermophysical requirements for the mediums of storage, such as thermal stability, high enthalpy of phase change or reaction, high heat capacity and suitable temperature of the thermal phenomenon for a respective application, among others. In this regard, the composition of materials usually needs to be modified in order to improve their performance or to reach a determined requirement. As a consequence, the costs of potential TES materials to be applied in renewable energy systems are too high to compete with traditional systems using fossil fuels. On the other hand, several wastes and by-products from the nonmetallic mining, such as salt hydrates and double salts, are available without any application but accumulating in the mining sites. This is the case for astrakanite (Na2SO4·MgSO4·4H2O) and lithium carnallite (LiCl·MgCl2·7H2O) with no current application, and potassium carnallite (KCl·MgCl2·6H2O) used as a supplementary raw material to obtain KCl. Since the costs of these materials are close to zero, they were characterized as TES materials taking into account the properties required for the three methods of storage. Results showed that astrakanite and potassium carnallite have potential to be applied as thermochemical material at lowmedium temperature (< 300 °C). Also, a dehydrated product obtained from astrakanite showed potential to be applied as phase change material (PCM) at high temperature, from 550 °C to 750 °C. Nevertheless, lithium carnallite did not show potential to be applied as TES material due to it low thermal stability, presenting partial decomposition below 200 °C.
Is part ofSolar Energy Materials and Solar Cells, 2017, vol. 170, p. 149-159
European research projects
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Ushak, Svetlana; Gutiérrez, Andrea; Galazutdinova, Yana; Barreneche Güerisoli, Camila; Cabeza, Luisa F.; Grágeda, Mario (John Wiley & Sons, 2016)Brines coming from salted lakes such as that at the Atacama desert in Chile produce by-products or wastes which today are stored in the nearby from the production areas. Bischofite is one of those by-products, and therefore, ...
Ushak, Svetlana; Gutiérrez, Andrea; Barreneche Güerisoli, Camila; Fernández Renna, Ana Inés; Grágeda, Mario; Cabeza, Luisa F. (Elsevier, 2016)The use of by-products or wastes as phase change materials (PCM) in thermal energy storage (TES) systems is a good option to decrease the cost of such systems. One of the main disadvantages of PCM if inorganic materials ...
Ushak, Svetlana; Gutiérrez, Andrea; Galleguillos, Hector; Fernández, Ángel G.; Cabeza, Luisa F.; Grágeda, Mario (Elsevier, 2015)Physical characterization and thermal properties of bischofite, a by-product from the non-metallic industry, were determined and compared with those to MgCl2 6H2O with the idea of using it as phase change material in ...