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| Title: |
The Effect of Simulated Lunar Dust on the Absorptivity, Emissivity, and Operating Temperature on AZ-93 and Ag/FEP Thermal Control Surfaces
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| Author(s): |
Gaier, James R.; Siamidis, John; Panko, Scott R.; Rogers, Kerry J.; Larkin, Elizabeth M. G.
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| Abstract: |
JSC-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.
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| NASA Center: |
Glenn Research Center
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| Publication Date: |
December 2008
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| Document Source: |
CASI |
| No Digital Version Available: |
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| Document ID: |
20090005996
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| Publication Information: |
Number of Pages = 21 |
| Report Number: |
E-16723; NASA/TM-2008-215492
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| Contract-Grant-Task Number: |
WBS 936374.04.08.03 |
| Price Code: |
A03 |
| Keywords: |
LUNAR DUST; LUNAR ENVIRONMENT; LUNAR SOIL; ABSORPTIVITY; EMISSIVITY; OPERATING TEMPERATURE; THERMAL CONTROL COATINGS; CONTROL SURFACES; STEADY STATE; DEGRADATION; SUBSTRATES;
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| Accessibility: |
Unclassified; Copyright; Unlimited; Publicly available; |
| Updated/Added to NTRS: |
2009-02-11 |
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