Antireflection Pyrex envelopes for parabolic solar collectors
Journal Article
·
· J. Sol. Energy Eng.; (United States)
Antireflective (AR) coatings, applied to the glass envelopes used in parabolic trough solar collectors around the receiver tube in order to reduce thermal losses, can increase solar transmittance by 7 percent. An AR surface has been formed on Pyrex by first heat treating the glass to cause a compositional phase separation, removing a surface layer after heat treatment through the use of a preetching solution, and finally etching in a solution that contains hydrofluorosilic and ammonium bifluoride acids. AR-coated samples with solar transmittance values of more than 0.97, by comparison to an untreated sample value of 0.91, have been obtained for the 560-630 C range of heat treatment temperatures. Optimum values have also been determined for the other processing parameters. 19 references.
- Research Organization:
- Sandia National Lab., Albuquerque, NM
- OSTI ID:
- 6644424
- Journal Information:
- J. Sol. Energy Eng.; (United States), Journal Name: J. Sol. Energy Eng.; (United States) Vol. 105; ISSN JSEED
- Country of Publication:
- United States
- Language:
- English
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