CaCl2+ KCl + NaCl molten-salt mixtures. Experimental and estimated enthalpies of mixing

Abstract

The CaCl₂+ KCl + NaCl molten-salt mixture is a candidate system for thermal-energy storage. Estimates of the amount of energy which can be stored by such a system requires knowledge of the enthalpies of formation of the liquid mixtures. We have therefore performed direct measurements of the enthalpy of mixing at 1083 K for the three limiting binary systems and the ternary mixture. However, estimates of the ternary enthalpy of mixing were made from those referring to the binary limiting systems using either Kolher's equation or the results derived from the surrounded-ion model, which was extended in the present work to ternary asymmetrical systems of the kind AX₂+ BX + CX.