Latent thermal storage using sodium hydroxide-based molten salts - Demonstration of 30kWh-scale storage units

Yoshiyuki Abe; Yoshio Takahashi; Kotaro Tanaka; Katsuhiko Kanari; Ryuji Sakamoto; Masayuki Kamimoto; Takeo Ozawa

doi:10.1252/kakoronbunshu.18.37

Latent thermal storage using sodium hydroxide-based molten salts - Demonstration of 30kWh-scale storage units

Yoshiyuki Abe, Yoshio Takahashi, Kotaro Tanaka, Katsuhiko Kanari, Ryuji Sakamoto, Masayuki Kamimoto, Takeo Ozawa

Research output: Contribution to journal › Article

Abstract

The present paper describes experimental results of the operation of 30kWh-scale molten salt latent thermal storage units using a eutectic of sodium hydroxide and sodium nitrate which is suitable for thermal storage around 250°C. The main problems of molten salt as a latent thermal storage material are its large volume change on phase change and its feasibility for use with structural materials. Using mild steel, two different U-tube storage units were built for testing heat transfer performance, structural feasibility and compatibility with the molten salt. From thorough and comprehensive material analyses after 1,000 melting-freezing (charge-discharge) cycle tests, it was concluded that the present storage unit structure (horizontal U-tube and multiple-path type) and material selection were fairly feasible for a latent thermal storage unit with this particular molten salt.

Original language	English
Pages (from-to)	37-43
Number of pages	7
Journal	Kagaku Kogaku Ronbunshu
Volume	18
Issue number	1
DOIs	https://doi.org/10.1252/kakoronbunshu.18.37
Publication status	Published - 1992
Externally published	Yes

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Keywords

Corrosion
Energy
High temperature
Latent heat
Molten salt
Sodium hydroxide
Thermal storage

ASJC Scopus subject areas

Chemical Engineering(all)
Chemistry(all)

Cite this

Abe, Y., Takahashi, Y., Tanaka, K., Kanari, K., Sakamoto, R., Kamimoto, M., & Ozawa, T. (1992). Latent thermal storage using sodium hydroxide-based molten salts - Demonstration of 30kWh-scale storage units. Kagaku Kogaku Ronbunshu, 18(1), 37-43. https://doi.org/10.1252/kakoronbunshu.18.37

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abstract = "The present paper describes experimental results of the operation of 30kWh-scale molten salt latent thermal storage units using a eutectic of sodium hydroxide and sodium nitrate which is suitable for thermal storage around 250°C. The main problems of molten salt as a latent thermal storage material are its large volume change on phase change and its feasibility for use with structural materials. Using mild steel, two different U-tube storage units were built for testing heat transfer performance, structural feasibility and compatibility with the molten salt. From thorough and comprehensive material analyses after 1,000 melting-freezing (charge-discharge) cycle tests, it was concluded that the present storage unit structure (horizontal U-tube and multiple-path type) and material selection were fairly feasible for a latent thermal storage unit with this particular molten salt.",

keywords = "Corrosion, Energy, High temperature, Latent heat, Molten salt, Sodium hydroxide, Thermal storage",

author = "Yoshiyuki Abe and Yoshio Takahashi and Kotaro Tanaka and Katsuhiko Kanari and Ryuji Sakamoto and Masayuki Kamimoto and Takeo Ozawa",

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AU - Sakamoto, Ryuji

AU - Kamimoto, Masayuki

AU - Ozawa, Takeo

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AB - The present paper describes experimental results of the operation of 30kWh-scale molten salt latent thermal storage units using a eutectic of sodium hydroxide and sodium nitrate which is suitable for thermal storage around 250°C. The main problems of molten salt as a latent thermal storage material are its large volume change on phase change and its feasibility for use with structural materials. Using mild steel, two different U-tube storage units were built for testing heat transfer performance, structural feasibility and compatibility with the molten salt. From thorough and comprehensive material analyses after 1,000 melting-freezing (charge-discharge) cycle tests, it was concluded that the present storage unit structure (horizontal U-tube and multiple-path type) and material selection were fairly feasible for a latent thermal storage unit with this particular molten salt.

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10.1252/kakoronbunshu.18.37