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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S4 — Jul. 2, 2012
  • pp: A554–A559

Absorption to reflection transition in selective solar coatings

Kyle D. Olson and Joseph J. Talghader  »View Author Affiliations


Optics Express, Vol. 20, Issue S4, pp. A554-A559 (2012)
http://dx.doi.org/10.1364/OE.20.00A554


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Abstract

The optimum transition wavelength between high absorption and low emissivity for selective solar absorbers has been calculated in several prior treatises for an ideal system, where the emissivity is exactly zero in the infrared. However, no real coating can achieve such a low emissivity across the entire infrared with simultaneously high absorption in the visible. An emissivity of even a few percent radically changes the optimum wavelength separating the high and low absorption spectral bands. This behavior is described and calculated for AM0 and AM1.5 solar spectra with an infrared emissivity varying between 0 and 5%. With an emissivity of 5%, solar concentration of 10 times the AM1.5 spectrum the optimum transition wavelength is found to be 1.28µm and have a 957K equilibrium temperature. To demonstrate typical absorptions in optimized solar selective coatings, a four-layer sputtered Mo and SiO2 coating with absorption of 5% across the infrared is described experimentally and theoretically.

© 2012 OSA

OCIS Codes
(350.6050) Other areas of optics : Solar energy
(310.3915) Thin films : Metallic, opaque, and absorbing coatings
(310.4165) Thin films : Multilayer design

ToC Category:
Solar Thermal

History
Original Manuscript: April 25, 2012
Revised Manuscript: June 9, 2012
Manuscript Accepted: June 12, 2012
Published: June 27, 2012

Citation
Kyle D. Olson and Joseph J. Talghader, "Absorption to reflection transition in selective solar coatings," Opt. Express 20, A554-A559 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S4-A554


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