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Novel inorganic binary mixture for low‐temperature heat storage applications
Author(s) -
Galazutdinova Yana,
Grágeda Mario,
Cabeza Luisa F.,
Ushak Svetlana
Publication year - 2017
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3805
Subject(s) - supercooling , thermal energy storage , enthalpy of fusion , temperature cycling , chemistry , thermal stability , thermodynamics , materials science , fusion , phase change material , thermal , chemical engineering , analytical chemistry (journal) , melting point , chromatography , organic chemistry , physics , engineering , linguistics , philosophy
Summary 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(NO 3 ) 2 · 6H 2 O. Thermophysical properties were defined and compared with those of the mixture with synthetic MgCl 2 · 6H 2 O. The heat of fusion and melting temperature were measured as 62.0°C and 132.5 kJ kg −1 for the mixture with MgCl 2 · 6H 2 O 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 MgCl 2 · 6H 2 O, 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 MgCl 2 · 6H 2 O, 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.