The Thermodynamic Analysis of Chemistry Stability of Eutectic Salt Phase Change Materials

This paper analyses the chemistry stability of eutectic salt phase change materials according to chemical thermodynamic principle, and introduces the methods and steps of thermodynamic calculation and analysis during the process of confecting eutectic salt materials. The paper takes thermodynamic calculation according to the two phase-change materials, Na₂CO₃-SiO₂ and Na₂SO₄-SiO₂. By comparing the relational graph of Gibbs free energy and the temperature, we found out that Na₂SO₄-SiO₂ bears a more stable chemical and thermal performance, which indicates the important role of thermodynamic calculation in studying the eutectic salt storage phase-change materials.