Computer Science – Performance
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1103...51t&link_type=abstract
SPACE, PROPULSION & ENERGY SCIENCES INTERNATIONAL FORUM: SPESIF-2009. AIP Conference Proceedings, Volume 1103, pp. 51-56 (2009)
Computer Science
Performance
Heat Engines, Heat Pumps, Heat Pipes, Lunar, Planetary, And Deep-Space Probes, Properties Of Nuclei, Nuclear Energy Levels
Scientific paper
A long titanium-water thermosyphon heat pipe was designed and tested in support of NASA's lunar surface power system. With a ΔT of 11.6 C, a prototype has been shown to meet the temperature drop specification of 15 C at 400 W and 400 K. The heat pipe is designed to be embedded in a composite radiator panel to spread waste heat delivered by a circulating pumped loop. The major challenge was managing the fluid inventory to balance the conflicting requirements of power capacity and freeze-thaw tolerance. A unique hybrid wick was designed to achieve the required thermal performance and yet store all the working fluid during idle periods in a freeze-thaw tolerant fashion. A non-condensable gas charge was used to boost power capacity at lower operating temperatures. Eighteen prototypes will be built and tested.
Semenov Sergey
Thayer John
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