Experimental evaluation on electrode conversion efficiency of alkali metal thermal to electric converter

Kotaro Tanaka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The alkali metal thermal to electric converter (AMTEC) system which utlizes the sodium ion conductivity of beta"-alumina solid electrolyte (BASE) is expected to have high conversion efficiency above 30% including practical heat loss. However, the achieved experimental efficiency- have been around 15%. In this paper, current-voltage characteristics and heat and mass transfer processes on a single cell have been examined experimentally and thermal electrode conversion efficiency has been discussed. Measured electrode conversion efficiency without thermal losses showed that it was about 40% at a power density of 0.3 W/cm2 A theoretical analysis on the thermal losses has also been conducted and these losses are estimated 0.3 W/cm2 in a practical tube type cell, so it is obtained that the actual cell system efficiency of 30% will be expected.

Original languageEnglish
Pages (from-to)301
Number of pages1
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number629
Publication statusPublished - 1999
Externally publishedYes


  • Direct energy conversion
  • Energy conversion
  • Heat transfer
  • Solid electrolyte
  • Thermal efficiency
  • Thermoelectric conversion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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