Novel high thermal stability LiF-Na sub(2)CO sub(3)-K sub(2)CO sub(3) eutectic ternary system for thermal energy storage applications

A novel eutectic composition in the LiF-Na sub(2)CO sub(3)-K sub(2)CO sub(3) ternary system was predicted using thermodynamic modeling based on Gibbs energy of fusion and designed for thermal energy storage or metal heat treatment. The Differential Calorimetry Scanning (DSC) technique was used to ex...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2015-09, Vol.140, p.366-375
Main Authors: Wang, Tao, Mantha, Divakar, Reddy, Ramana G
Format: Article
Language:English
Subjects:
Energy storage
Eutectic composition
Heat transfer
Mathematical models
Ternary systems
Thermal conductivity
Thermal energy
Thermal stability
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Summary:A novel eutectic composition in the LiF-Na sub(2)CO sub(3)-K sub(2)CO sub(3) ternary system was predicted using thermodynamic modeling based on Gibbs energy of fusion and designed for thermal energy storage or metal heat treatment. The Differential Calorimetry Scanning (DSC) technique was used to experimentally measure the melting point of the eutectic composition in the ternary system which was determined to be 694.40 K. Heat capacity of the eutectic composition of the ternary system was also measured using DSC from solid to liquid state and the results were plotted as function of temperature. The upper temperature limit for thermal stability of the eutectic mixture was determined in different atmospheres using the Thermogravimetric Analyzer (TGA). The high upper temperature limit for thermal stability ensures the large working temperature range of the LiF-Na sub(2)CO sub(3)-K sub(2)CO sub(3) ternary system. Thermal conductivity of the ternary system was also studied by using a simplified inverse method. The relatively high thermal conductivity indicates its high efficiency of energy storage. Based on the measured thermodynamic properties, physical properties and its high energy storage density, this ternary system can be used as heat transfer fluid for thermal energy storage application.
ISSN:0927-0248
DOI:10.1016/j.solmat.2015.04.033