Experimental Study of Eutectic Molten Salts NaCl/KCl/ZnCl2 Heat Transfer Inside a Smooth Tube for High-Temperature Application

Abstract Eutectic salts NaCl-KCl-ZnCl2 and NaCl-KCl-MgCl2 are two of the chloride salt systems that promising for being used as high-temperature heat transfer fluid (HTF) thermal energy storage (TES) materials in a wide range temperatures from 230 °C to 750 concentrated solar power systems. To conduct measurement coefficient molten at high temperatures, circulation system instrumentation flow was constructed. Experimental convective coefficients (molar fraction: 13.8–41.9–44.3%) inside tubes has been accomplished find most suitable correlations. Experience processing operation test obtained. Two correlations, Dittus-Boelter equation Gnielinski’s correlation Nusselt number against Reynolds Prandtl number, evaluated using results, latter is recommended due its better agreement prediction tested data.