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

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5 Citations (Scopus)

Abstract

The alkali metal thermal to electric converter (AMTEC) system which utilizes the sodium ion conductivity of a beta"-alumina solid electrolyte (BASE) is expected to have high conversion efficiency above 30% including practical heat losses. However, the achieved experimental 0efficiencies 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 to be 0.3 W/cm2 in a practical tube type cell, so that an actual cell system efficiency of 30% is expected.

Original languageEnglish
Pages (from-to)234-244
Number of pages11
JournalHeat Transfer - Asian Research
Volume30
Issue number3
DOIs
Publication statusPublished - 2001 May
Externally publishedYes

Fingerprint

Electric converters
Alkali Metals
Alkali metals
alkali metals
Conversion efficiency
converters
Electrodes
electrodes
evaluation
cells
thermodynamic efficiency
Aluminum Oxide
Solid electrolytes
solid electrolytes
Current voltage characteristics
Heat losses
mass transfer
radiant flux density
Alumina
Mass transfer

Keywords

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

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

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abstract = "The alkali metal thermal to electric converter (AMTEC) system which utilizes the sodium ion conductivity of a beta{"}-alumina solid electrolyte (BASE) is expected to have high conversion efficiency above 30{\%} including practical heat losses. However, the achieved experimental 0efficiencies 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 to be 0.3 W/cm2 in a practical tube type cell, so that an actual cell system efficiency of 30{\%} is expected.",
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journal = "Heat Transfer - Asian Research",
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AB - The alkali metal thermal to electric converter (AMTEC) system which utilizes the sodium ion conductivity of a beta"-alumina solid electrolyte (BASE) is expected to have high conversion efficiency above 30% including practical heat losses. However, the achieved experimental 0efficiencies 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 to be 0.3 W/cm2 in a practical tube type cell, so that an actual cell system efficiency of 30% is expected.

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