Novel inorganic binary mixture for low-temperature heat storage applications

Abstract

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(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.

Development of the inorganic composite phase change materials for passive thermal management of Li‐ion batteries: material characterization

“…Paraffin wax was used as reference material since the composite PCM (graphite matrix/wax) is currently commercialized by AllCell Technologies, LLC (Chicago, IL) and the material properties are well investigated . Concerning the inorganic PCMs (2) and (3), their properties were previously studied and described in …”

“…In order to prepare composite materials with expanded graphite, three types of PCM were tested: (1) paraffin wax (T m = 55 C), ( [15][16][17] Concerning the inorganic PCMs (2) and (3), their properties were previously studied and described in. 18,19…”

A Comprehensive Review of Thermal Energy Storage

“…Melting point and latent heat of fusion for selected metallics [46]. An inorganic mixture based on an industrial by-product (bischofite) was developed and characterized for its application as a PCM for low-temperature thermal energy storage [47]. The most appropriate composition was established as 40 wt % bischofite and 60 wt % Mg(NO 3 ) 2 ·6H 2 O. Thermo-physical properties, specific heat capacity, cycling, and thermal stability were determined.…”

Development and Results from Application of PCM-Based Storage Tanks in a Solar Thermal Comfort System of an Institutional Building—A Case Study

“…Thus, the replacement strategy was applied, and the proposed novel low-cost mixture based on Mg(NO 3 ) 2 •6H 2 O/bischofite had a melting temperature of 58.2 • C and the heat of fusion of 116.9 kJ•kg −1 . The details of their thermal and physical properties, as well as their characterization and optimization can be found in [27,28]. This waste material was studied as a possible PCM at different scales, from laboratory to pilot plant [25,26], demonstrating that bischofite has similar thermophysical characteristics to synthetic MgCl2•6H2O, but a lower cost.…”

“…Thus, the replacement strategy was applied, and the proposed novel low-cost mixture based on Mg(NO3)2•6H2O/bischofite had a melting temperature of 58.2 °C and the heat of fusion of 116.9 kJ•kg −1 . The details of their thermal and physical properties, as well as their characterization and optimization can be found in [27,28].…”