Cascaded thermionic converters

Fitzpatrick, G. O.; Allen, Daniel T.; McVey, J. B.

doi:10.1063/1.41814

Cited by 2 publications

(1 citation statement)

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“…Thermal efficiencies for thermionic power converters up to 17% have been reported. 13 Again, scaling to MW e levels for thermionic systems is not practical.…”

Section: Other Cooling Optionsmentioning

confidence: 99%

Multi Megawatt Power System Analysis Report

Longhurst¹,

Harvego²,

Schnitzler³

et al. 2001

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Missions to the outer planets or to near-by planets requiring short times and/or increased payload carrying capability will benefit from nuclear power. A concept study was undertaken to evaluate options for a multi-megawatt power source for nuclear electric propulsion. The nominal electric power requirement was set at 15 MW e with an assumed mission profile of 120 days at full power, 60 days in hot standby, and another 120 days of full power, repeated several times for 7 years of service. Of the numerous options considered, two that appeared to have the greatest promise were a gas-cooled reactor based on the NERVA Derivative design, operating a closed cycle Brayton power conversion system; and a molten lithium-cooled reactor based on SP-100 technology, driving a boiling potassium Rankine power conversion system. This study examined the relative merits of these two systems, seeking to optimize the specific mass. Conclusions were that either concept appeared capable of approaching the specific mass goal of 3-5 kg/kW e estimated to be needed for this class of mission, though neither could be realized without substantial development in reactor fuels technology, thermal radiator mass efficiency, and power conversion and distribution electronics and systems capable of operating at high temperatures. Though the gas-Brayton systems showed an apparent advantage in specific mass, differences in the degree of conservatism inherent in the models used suggests expectations for the two approaches may be similar. Brayton systems eliminate the need to deal with two-phase flows in the microgravity environment of space.iii CONTENTS

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“…Thermal efficiencies for thermionic power converters up to 17% have been reported. 13 Again, scaling to MW e levels for thermionic systems is not practical.…”

Section: Other Cooling Optionsmentioning

confidence: 99%