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 journalArticle


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 languageEnglish
Pages (from-to)37-43
Number of pages7
JournalKagaku Kogaku Ronbunshu
Issue number1
Publication statusPublished - 1992
Externally publishedYes



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

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this