Solar tests of aperture plate materials for solar thermal dish collectors
- Jaffe, L. D.
- Aug 15, 1983.
- Physical Description:
- 1 electronic document
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available. and Free-to-read Unrestricted online access
- In parabolic dish solar collectors, walk-off of the spot of concentrated sunlight is a hazard if a malfunction causes the concentrator to stop following the Sun. Therefore, a test program was carried out to evaluate the behavior of various ceramics, metals, and polymers under solar irradiation of about 7000 kW/sq m. (peak) for 15 minutes. The only materials that did not slump or shatter were two grades of medium-grain 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 on-Sun operation).
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19840013942., Accession ID: 84N22010., JPL-5105-121., DOE/JPL-1060-62., NAS 1.26:173462., JPL-PUB-83-68., and NASA-CR-173462.
- No Copyright.
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