Evaluation and selection of eutectic salts combined with metal foams for applications in high-temperature latent heat thermal energy storage

Kim, Hansol; Seo, Joseph; Hassan, Yassin A.; Yoo, JunSoo; Qin, Sunming; Hartvigsen, Jeremy L.

doi:10.1016/j.est.2023.109790

Evaluation and selection of eutectic salts combined with metal foams for applications in high-temperature latent heat thermal energy storage

Journal Article · Tue Nov 21 23:00:00 EST 2023 · Journal of Energy Storage

DOI:https://doi.org/10.1016/j.est.2023.109790· OSTI ID:2367529

Kim, Hansol ^[1]; Seo, Joseph ^[1]; Hassan, Yassin A. ^[1]; Yoo, JunSoo ^[2]; Qin, Sunming ^[2]; Hartvigsen, Jeremy L. ^[2]

Texas A & M Univ., College Station, TX (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

This study presents a systematic process for selecting eutectic salts for use in latent heat thermal energy storage (LHTES), and provides experimental evidence regarding their performance. One primary goal was to identify the most suitable eutectic salt for use with metallic foams over a temperature range of 450 °C–500 °C. Twenty-one eutectic salts were preselected for comparison. Here, the performance and cost-effectiveness of each were evaluated based on the Ragone relation, enabling a fair comparison of each salt's heat storage capacity and power density relative to cost. As a result, MgCl-NaCl, CaCl₂-NaCl, and FLiNaK were selected as the most promising candidates. Subsequently, experiments were performed to demonstrate the compatibility of the selected salts with metal foams while the copper and aluminum foams were immersed in the salts at 550 °C for 120 h. Combining C10100 (copper alloy) foam with CaCl₂-NaCl was observed to generate the least surface corrosion due to oxidation. The charge/discharge performance and thermal stability of CaCl₂-NaCl, both with and without the copper foam, were also tested to confirm the feasibility of this combination. The capsule with the copper foam showed enhanced performance (a 13 % reduced discharge rate) in comparison to the capsule without copper foam. The melting point of the CaCl₂-NaCl remained unchanged for 300-h duration of the cyclic melting/solidification experiments, and no thermal stability issues were observed.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2367529

Alternate ID(s):: OSTI ID: 2217641

Report Number(s):: INL/JOU--23-73886-Rev000

Journal Information:: Journal of Energy Storage, Journal Name: Journal of Energy Storage Vol. 76; ISSN 2352-152X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
Eutectic salts
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high-temperature corrosion
metal foams

Evaluation and selection of eutectic salts combined with metal foams for applications in high-temperature latent heat thermal energy storage

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