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Heat Rejection Concepts for Lunar Fission Surface Power ApplicationsThis paper describes potential heat rejection design concepts for lunar surface Brayton power conversion systems. Brayton conversion systems are currently under study by NASA for surface power applications. Surface reactors may be used for the moon to power human outposts enabling extended stays and closed loop life support. The Brayton Heat Rejection System (HRS) must dissipate waste heat generated by the power conversion system due to inefficiencies in the thermal-to-electric conversion process. Space Brayton conversion system designs tend to optimize at efficiencies of about 20 to 25 percent with radiator temperatures in the 400 K to 600 K range. A notional HRS was developed for a 100 kWe-class Brayton power system that uses a pumped water heat transport loop coupled to a water heat pipe radiator. The radiator panels employ a tube and fin construction consisting of regularly-spaced circular heat pipes contained within two composite facesheets. The water heat pipes interface to the coolant through curved sections partially contained within the cooling loop. The paper evaluates various design parameters including radiator panel orientation, coolant flow path, and facesheet thickness. Parameters were varied to compare design options on the basis of H2O pump pressure rise and required power, heat pipe unit power and radial flux, radiator area, radiator panel areal mass, and overall HRS mass.
Document ID
Document Type
Contractor Report (CR)
Siamidis, John
(Analex Corp. Brook Park, OH, United States)
Date Acquired
August 24, 2013
Publication Date
November 1, 2006
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA Paper 2006-4196
Meeting Information
Fourth International Energy Conversion Engineering Conference and Exhibit (IECEC)(San Diego, CA)
Funding Number(s)
WBS: WBS 169.04.03
Distribution Limits
Work of the US Gov. Public Use Permitted.
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