Thermal conductivity measurement using modulated photothermal radiometry for nitrate and chloride molten salts

Chung, Ka Man; Feng, Tianshi; Zeng, Jian; Adapa, Sarath Reddy; Zhang, Xintong; Zhao, Andrew Z.; Zhang, Ye; Li, Peiwen; Zhao, Youyang; Garay, Javier E.; Chen, Renkun

doi:10.1016/j.ijheatmasstransfer.2023.124652

Thermal conductivity measurement using modulated photothermal radiometry for nitrate and chloride molten salts

Journal Article · Mon Sep 11 04:00:00 EDT 2023 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2023.124652· OSTI ID:2005537

^[1]; Feng, Tianshi ^[1]; ^[1]; Adapa, Sarath Reddy ^[1]; Zhang, Xintong ^[1]; ^[1]; Zhang, Ye ^[2]; ^[2]; ^[3]; Garay, Javier E. ^[1]; ^[1]

Univ. of California, San Diego, CA (United States)
Univ. of Arizona, Tucson, AZ (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Molten salts are being used or explored for thermal energy storage and conversion systems in concentrating solar power and nuclear power plants. Thermal conductivity of molten salts is an important thermophysical property dictating the performance and cost of these systems, but its accurate measurement has been challenging, as evidenced by wide scattering of existing data in literature. The corrosive and conducting nature of these fluids also leads to time consuming sample preparation processes of many contact-based measurements. Here, in this work, we report the measurement of thermal conductivity of molten salts using a modulated photothermal radiometry (MPR) technique, which is a laser-based, non-contact, frequency-domain method adopted for molten salts for the first time. By unitizing the advantages of front side sensing of frequency-domain measurements and the vertical holder orientation, the technique can minimize the natural convection and salt creeping effects, thus yielding accurate molten salt thermal conductivity . The MPR technique is first calibrated using standard molten materials including paraffin wax and sulfur. It is then applied on measuring pure nitrate salts (NaNO₃ and KNO₃), solar salt (NaNO₃–KNO₃ mixture), and chloride salt (NaCl–KCl–MgCl₂). The measurement results are compared with data from literature, especially those obtained from laser flash analysis (LFA). Our results demonstrate that the MPR is a convenient and reliable technique of measuring thermal conductivity of molten salts. Accurate thermal conductivity data of molten salts will be valuable in developing the next-generation high-temperature thermal energy storage and conversion systems.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

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

Grant/Contract Number:: AC36-08GO28308; EE0008379

OSTI ID:: 2005537

Alternate ID(s):: OSTI ID: 2001023
OSTI ID: 2229618

Report Number(s):: NREL/JA--5700-82490; MainId:83263; UUID:2c5689af-505e-46d1-88a1-6a1c315cdca7; MainAdminID:70567

Journal Information:: International Journal of Heat and Mass Transfer, Journal Name: International Journal of Heat and Mass Transfer Vol. 217; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Thermal conductivity measurement using modulated photothermal radiometry for nitrate and chloride molten salts

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