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

Kotaro Tanaka

doi:10.1002/htj.1013

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

Kotaro Tanaka

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	234-244
Number of pages	11
Journal	Heat Transfer - Asian Research
Volume	30
Issue number	3
DOIs	https://doi.org/10.1002/htj.1013
Publication status	Published - 2001 May 1
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Condensed Matter Physics
Fluid Flow and Transfer Processes

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10.1002/htj.1013

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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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