Specular reflectance properties of solar mirrors as a function of incident angle
The specular reflectance properties of several solar mirror materials have been measured as a function of wavelength, polarization and incident angle. Results for a 3-mm thick, silvered float glass mirror and an aluminized acrylic stretched film are presented. For the silvered glass mirror, measured specular and hemispherical reflectance properties are in excellent agreement with reflectance values calculated from a multiple beam reflectance model. At 65/sup 0/ from normal, the average solar reflectance is decreased only approx. 4% from the value at normal incidence. For the aluminized acrylic mirror, measured specular reflectance values at 15 mrad were in agreement with hemispherical reflectance values, while calculated reflectance values are as much as 2% high for one polarization. The average solar reflectance decreases only 2% at an incident angle of 65/sup 0/ from normal, while the width of the specular beam increases slightly with incident angle.
- Research Organization:
- Albuquerque Academy, NM (USA); Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 6113708
- Report Number(s):
- SAND-78-2047C; CONF-790541-29
- Resource Relation:
- Conference: International Solar Energy Society meeting, Atlanta, GA, USA, 28 May 1979; Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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