In this study, the minimum melting temperature composition for the MgCl 2–KCl–NaCl mixture was estimated by FactSage simulation, while the binary and ternary phase diagrams of the MgCl 2–KCl–NaCl salt system, including their phase transitions, were studied. This ternary MgCl 2–KCl–NaCl salt mixture with a low material cost (<0.35 $/kg) is a promising salt for high-temperature TES/HTF applications, for example, it could enable next-generation CSP plants to have significant power cycle efficiency and lower levelized cost of electricity (LCOE). Molten chloride mixtures such as MgCl 2–KCl–NaCl are potential thermal energy storage (TES) materials and heat transfer fluids (HTFs) for next-generation concentrating solar power (CSP) systems due to their high operation temperatures (>700☌) and low costs. 2Institute of Engineering Thermodynamics, German Aerospace Center (DLR), Cologne, Germany.
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