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

Zhang, Ye; Wang, Xiaoxin; Hu, Qichao; Li, Peiwen; Liu, Qibin; Xu, Ben

doi:10.1115/1.4053974

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

Journal Article · 18 March 2022 · Journal of Solar Energy Engineering

DOI:https://doi.org/10.1115/1.4053974· OSTI ID:1980697

Zhang, Ye; Wang, Xiaoxin; Hu, Qichao; Li, Peiwen; Liu, Qibin; Xu, Ben

Abstract

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

Research Organization:: Univ. of Arizona, Tucson, AZ (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0005942

OSTI ID:: 1980697

Journal Information:: Journal of Solar Energy Engineering, Vol. 144, Issue 4; ISSN 0199-6231

Publisher:: ASME

Country of Publication:: United States

Language:: English

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