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Effect of Illumination Angle on the Performance of Dusted Thermal Control Surfaces in a Simulated Lunar EnvironmentJSC-1A lunar simulant has been applied to AZ93 and AgFEP thermal control surfaces on aluminum substrates in a simulated lunar environment. The temperature of these surfaces was monitored as they were heated with a solar simulator using varying angles of incidence and cooled in a 30 K coldbox. Thermal modeling was used to determine the solar absorptivity (a) and infrared emissivity (e) of the thermal control surfaces in both their clean and dusted states. It was found that even a sub-monolayer of dust can significantly raise the a of either type of surface. A full monolayer can increase the a/e ratio by a factor of 3 to 4 over a clean surface. Little angular dependence of the a of pristine thermal control surfaces for both AZ93 and AgFEP was observed, at least until 30 from the surface. The dusted surfaces showed the most angular dependence of a when the incidence angle was in the range of 25 to 35 . Samples with a full monolayer, like those with no dust, showed little angular dependence in a. The e of the dusted thermal control surfaces was within the spread of clean surfaces, with the exception of high dust coverage, where a small increase was observed at shallow angles.
Document ID
20090040686
Document Type
Technical Memorandum (TM)
Authors
Gaier, James R. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 8, 2013
Publication Date
October 1, 2009
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
NASA/TM-2009-215647
2009-01-2420
E-16959
Meeting Information
39th International Conference on Environmental Systems (ICES)(Savannah, GA)
Funding Number(s)
WBS: WBS 119103.04.05.04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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