Experimental investigation of a thermionic converter with Molybdenum electrodes for low temperature applications

Details Experimental investigation of a thermionic converter with Molybdenum electrodes for low temperature applications Experimental investigation of a thermionic converter with Molybdenum electrodes for low temperature applications

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..552.1142m&link_type=abstract

Space Technology and Applications International Forum - 2001. AIP Conference Proceedings, Volume 552, pp. 1142-1151 (2001).

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Theory, Design, And Computerized Simulation, Spaceborne And Space Research Instruments, Apparatus, And Components, Thermionic And Filament-Based Sources

Scientific paper

Experiments performed, which investigated the suitability of Molybdenum electrodes, planar converter with 0.5-mm inter-electrode gap for low temperature, energy conversion applications. Results confirmed that for TE<1773 K, the performance of the present converter is superior to that with a tungsten emitter, when operated at near same conditions. The largest difference occurred at TE~1600 K and Tc~1000 K, at which the maximum electric power density (3.0 Wc/cm2) is 70% higher than that of the converter with a W emitter, at more than double the output voltage (0.43 vs. 0.21 V) and at lower cesium pressure (~105 Pa vs. 245 Pa). Differences in the maximum electric power density of 25% and 50% occurred at TE=1700 K, Tc=1000 K and TE=1600 K and Tc=800 K, respectively, and consistently at lower cesium pressure and higher output voltage, which are major advantages for practical applications. The measured electric power density of the present converter of ~3.22 Wc/cm2 occurred at TE=1673 K, TC=973 K, at slightly higher output voltage (0.49 V), and PC (241 Pa), and at an estimated conversion efficiency of 12.74%. .

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