Novel inorganic binary mixture for low‐temperature heat storage applications
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In this study, an inorganic mixture based on bischofite (industrial by‐product) was developed and characterized for its application as a phase change material for low‐temperature thermal energy storage. The most appropriate composition was established as 40 wt% bischofite and 60 wt% Mg(NO3)2 · 6H2O. Thermophysical properties were defined and compared with those of the mixture with synthetic MgCl2 · 6H2O. The heat of fusion and melting temperature were measured as 62.0°C and 132.5 kJ kg−1 for the mixture with MgCl2 · 6H2O and 58.2°C and 116.9 kJ kg−1 for the mixture with bischofite. The specific heat capacity values, cycling, and thermal stability for both mixtures were also determined. For the mixture with MgCl2 · 6H2O, the densities of the solid and liquid states were 1517 kg m−3 (ambient temperature) and 1515 kg m−3 (at 60‐70°C), respectively. For the mixture with bischofite, the densities of the solid and liquid states were 1525 kg m−3 (ambient temperature) and 1535 kg m−3 (at 60‐70°C), respectively. Both mixtures show supercooling of about 23.4 and 34.1°C for the mixture with bischofite and MgCl2 · 6H2O, respectively. In addition, it was shown that supercooling may be reduced by increasing the quantity of material tested. Thereby, it was established that an inorganic mixture based on bischofite is a promising PCM for low‐temperature thermal energy storage applications.
Is part ofInternational Journal of Energy Research, 2017, vol. 41, num. 14, p. 2356-2364
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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 ...
Characterization of wastes based on inorganic double salt hydrates as potential thermal energy storage materials Gutiérrez, Andrea; Ushak, Svetlana; Mamani, Veronica; Vargas, Pedro; Barreneche Güerisoli, Camila; Cabeza, Luisa F.; Grágeda, Mario (Elsevier, 2017)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 ...
Compatibility of materials for macroencapsulation of inorganic phase change materials: experimental corrosion study Ushak, Svetlana; Marín, Paula; Galazutdinova, Yana; Cabeza, Luisa F.; Farid, Mohammed M.; Grágeda, Mario (Elsevier, 2016)The potential of the use of salt hydrates MgCl2·6H2O (bischofite) with typical impurities of the Salar de Atacama as a thermal energy storage material was evaluated with special attention to its corrosion behavior. Bischofite ...