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Technical Brief

Thermal and Transport Properties of NaCl–KCl–ZnCl2 Eutectic Salts for New Generation High-Temperature Heat-Transfer Fluids

[+] Author and Article Information
Peiwen Li, Edgar Molina, Kai Wang, Xiankun Xu, Ghazal Dehghani, Amit Kohli, Qing Hao

Department of Aerospace and Mechanical Engineering,
The University of Arizona,
Tucson, AZ 85721

Mohamad H. Kassaee, Sheldon M. Jeter, Amyn S. Teja

Department of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received December 6, 2015; final manuscript received May 25, 2016; published online June 27, 2016. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 138(5), 054501 (Jun 27, 2016) (8 pages) Paper No: SOL-15-1412; doi: 10.1115/1.4033793 History: Received December 06, 2015; Revised May 25, 2016

Three eutectic salts from a system of halide salts NaCl–KCl–ZnCl2 were chosen for detailed study of thermal and transport properties with the objective of developing a next generation high-temperature heat-transfer fluid (HTF) for concentrated solar thermal power (CSP) technology. The acceptable range of the working temperatures for the HTF is from below 250 °C to at least 800 °C. The tested properties are presented here for the three candidate eutectic salts, including melting point, heat of fusion, heat capacity, vapor pressure, viscosity, density, and thermal conductivity. Data-fitted equations are provided for all the measured properties for convenience in engineering application. It is concluded that the three eutectic salts can satisfy the needs for a high-temperature HTF and thus are recommended as a new generation high-temperature HTF.

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Figures

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Fig. 1

Schematic of the high-temperature molten salt vapor pressure test system

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Fig. 2

Details of the structure of the quartz test tube for vapor pressure measurement

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Fig. 3

Multiple measurements and comparison of vapor pressures of all the three ZnCl2–KCl–NaCl salts: (a) salt #1, (b) salt #2, (c) salt #3, and (d) all the salts

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Fig. 4

Multiple measurements and comparison of viscosity of all the three ZnCl2–KCl–NaCl salts: (a) salt #1, (b) salt #2, (c) salt #3, and (d) all the salts

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Fig. 5

Multiple measurements and comparison of density of all the three ZnCl2–KCl–NaCl salts: (a) salt #1, (b) salt #2, (c) salt #3, and (d) all the salts

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Fig. 6

Multiple measurements and comparison of thermal conductivity of all the three ZnCl2–KCl–NaCl salts: (a) salt #1, (b) salt #2, (c) salt #3, and (d) all the salts

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