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

Kotaro Tanaka

doi:10.1299/kikaib.65.301

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

Kotaro Tanaka

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

1 Citation (Scopus)

Abstract

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 language	English
Number of pages	1
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	65
Issue number	629
DOIs	https://doi.org/10.1299/kikaib.65.301
Publication status	Published - 1999 Jan 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
Mechanical Engineering

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AB - 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.

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KW - Heat transfer

KW - Solid electrolyte

KW - Thermal efficiency

KW - Thermoelectric conversion

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