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The Effect of Simulated Lunar Dust on the Absorptivity, Emissivity, and Operating Temperature on AZ-93 and Ag/FEP Thermal Control SurfacesJSC-1AF lunar simulant has been applied to AZ-93 and AgFEP thermal control surfaces on aluminum or composite substrates in a simulated lunar environment. The temperature of these surfaces was monitored as they were heated with a solar simulator and cooled in a 30 K coldbox. Thermal modeling was used to determine the absorptivity ( ) and emissivity ( ) of the thermal control surfaces in both their clean and dusted states. Then, a known amount of power was applied to the samples while in the coldbox and the steady state temperatures measured. It was found that even a submonolayer of simulated lunar dust can significantly degrade the performance of both white paint and second-surface mirror type thermal control surfaces under these conditions. Contrary to earlier studies, dust was found to affect as well as . Dust lowered the emissivity by as much as 16 percent in the case of AZ-93, and raised it by as much as 11 percent in the case of AgFEP. The degradation of thermal control surface by dust as measured by / rose linearly regardless of the thermal control coating or substrate, and extrapolated to degradation by a factor 3 at full coverage by dust. Submonolayer coatings of dust were found to not significantly change the steady state temperature at which a shadowed thermal control surface will radiate.
Document ID
20090005996
Document Type
Technical Memorandum (TM)
Authors
Gaier, James R. (NASA Glenn Research Center Cleveland, OH, United States)
Siamidis, John (NASA Glenn Research Center Cleveland, OH, United States)
Panko, Scott R. (ASRC Aerospace Corp. Cleveland, OH, United States)
Rogers, Kerry J. (Manchester Coll. North Manchester, IN, United States)
Larkin, Elizabeth M. G. (Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
December 1, 2008
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
NASA/TM-2008-215492
E-16723
Funding Number(s)
WBS: WBS 936374.04.08.03
Distribution Limits
Public
Copyright
Public Use Permitted.

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