Evaluation of the Performance of Alkali Metal Thermoelectric Converter with Potassium β”-Alumina solid Electrolyte

Kotaro Tanaka, Akira Negishi, Toshihisa Masuda

Research output: Contribution to journalArticle


The replacement of working fluid of the alkali metal themoelectric converter (AMTEC) is eminently suitable for achieving higher performance under lower operating temperatures. Potassium is a reasonable condidate because it has lower latent heat of vaporization and higher vapor pressure than sodium over the AMTEC operating conditions. The performance of the AMTEC cycle with potassium as the working fluid has been evaluated and discussed based on the recently reported ionic conductivity data of potassium-β”-alumina solid electrolyte. The calculated results show that the replacement of working fluid increases the peak efficiency from 28% to 31% at 1100 K with 1 mm thick β”-alumina solid electrolyte. If the thinner solid electrolyte is practically developed, the improvement of the performance can obviously be recognized because of the decrease of ionic conductivity.

Original languageEnglish
Pages (from-to)2857-2862
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number553
Publication statusPublished - 1992
Externally publishedYes



  • Alkali Metal
  • Direct Energy Conversion
  • Energy Conversion
  • Ionic Conductivity
  • Solid Electrolyte
  • Thermal Efficiency

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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