In-situ thermophysical measurement of flowing molten chloride salt using modulated photothermal radiometry

Chung, Ka Man; Zhang, Ye; Zeng, Jian; Haddad, Fouad; Adapa, Sarath; Feng, Tianshi; Li, Peiwen; Chen, Renkun

doi:10.1016/j.solener.2023.112124

In-situ thermophysical measurement of flowing molten chloride salt using modulated photothermal radiometry

Journal Article · Tue Oct 24 00:00:00 EDT 2023 · Solar Energy

DOI:https://doi.org/10.1016/j.solener.2023.112124· OSTI ID:2229616

Chung, Ka Man ^[1]; Zhang, Ye ^[2]; ^[3]; Haddad, Fouad ^[2]; Adapa, Sarath ^[3]; Feng, Tianshi ^[3]; Li, Peiwen ^[2]; Chen, Renkun ^[3]

University of California, San Diego, La Jolla, CA (United States); The Regents of the University of California; University of California San Diego.
University of Arizona, Tucson, AZ (United States)
University of California, San Diego, La Jolla, CA (United States)

Molten salts are leading candidates for high-temperature heat transfer fluids (HTFs) for thermal energy storage and conversion systems in concentrated solar power (CSP) and nuclear energy power plants. The ability to probe molten salt thermal transport properties in both stationary and flowing status is important for the evaluation of their heat transfer performance under realistic operational conditions, including the temperature range and potential degradation due to corrosion and contamination. However, accurate thermal transport properties are usually challenging to obtain even for stagnant molten salts due to different sources of errors from convection, radiation, and corrosion, let alone at flowing status. To the best of authors’ knowledge, there is no available in-situ technique for measuring flowing molten salt thermal conductivity. Here, we report the first in-situ flowing molten salt thermal conductivity measurement using modulated photothermal radiometry (MPR). We could successfully perform the first in-situ thermal conductivity measurement of flowing molten NaCl-KCl-MgCl₂ in the typical operating temperature (520 and 580 °C) with flow velocities ranging from around 0.3 to 1.0 m s^-1. The relative change of the molten salt thermal conductivity was measured. Gnielinski’s correlation was also used to estimate the heat transfer coefficient h of the flowing NaCl-KCl-MgCl₂ in the given experimental condition. Furthermore, the work showed the potential of the MPR technique serving as an in-situ diagnostics tool to evaluate the heat transfer performance of flowing molten salts and other high-temperature HTFs.

View Accepted Manuscript (DOE)

Research Organization:: University of California, San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008379

OSTI ID:: 2229616

Alternate ID(s):: OSTI ID: 2369179

Journal Information:: Solar Energy, Journal Name: Solar Energy Vol. 265; ISSN 0038-092X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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