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Proceedings Paper

Evaluation of thermal control coatings exposed to ambient weather conditions at Haleakala High Altitude Observatory
Author(s): L. Phelps
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Paper Abstract

The derived heat loads from thermal models are used to size the equipment that controls exterior enclosure seeing for the Advanced Technology Solar Telescope. These loads are highly dependent on the radiative properties assumed for the surface coatings of the enclosure. The properties of traditional white coatings and paints are known to degrade with time as they are exposed to the elements, but not by how much or how quickly. The solar reflectance and thermal emissivity of coatings considered for use on the enclosure, in a weathered condition, are not readily available from coatings manufacturers or in the scientific literature. The results from a one-year test of nine different coatings that were weathered at the summit of Haleakala on the island of Maui, Hawaii are reported and discussed.

Paper Details

Date Published: 10 July 2008
PDF: 9 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701230 (10 July 2008); doi: 10.1117/12.789156
Show Author Affiliations
L. Phelps, National Solar Observatory (United States)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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