Solar Tests of Aperture Plate Materials for Solar Thermal Dish Collectors

[+] Author and Article Information
L. D. Jaffe

Solar Thermal Power Systems, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, Calif. 91109

J. Sol. Energy Eng 106(4), 408-415 (Nov 01, 1984) (8 pages) doi:10.1115/1.3267619 History: Received January 01, 1984; Online November 11, 2009


In parabolic dish solar collectors, walk-off of the spot of concentrated sunlight can be a hazard if a malfunction causes the concentrator to stop following the sun. A test program, therefore, was carried out to evaluate the behavior of various ceramics, metals, and polymers under solar irradiation of about 7000 kW/m2 (peak) for 15 min. The only materials that did not slump or shatter were two grades of medium-grained extruded graphite. High-purity slip-cast silica might be satisfactory at somewhat lower flux. Oxidation of the graphite appeared acceptable during tests simulating walk-off, acquisition (2000 cycles on/off sun), and spillage (continuous exposure of a receiver aperture lip).

Copyright © 1984 by ASME
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