Solar concentration properties of flat fresnel lenses with large F-numbers. Final Report
Technical Report
·
OSTI ID:6070317
The solar concentration performances of flat, line-focusing sun-tracking Fresnel lenses with selected f-numbers between 0.9 and 2.0 were analyzed. Lens transmittance was found to have a weak dependence on f-number, with a 2% increase occuring as the f-number is increased from 0.9 to 2.0. The geometric concentration ratio for perfectly tracking lenses peaked for an f-number near 1.35. Intensity profiles were more uniform over the image extent for large f-number lenses when compared to the f/0.9 lens results. Substantial decreases in geometric concentration ratios were observed for transverse tracking errors equal to or below 1 degree for all f-number lenses. With respect to tracking errors, the solar performance is optimum for f-numbers between 1.25 and 1.5.
- Research Organization:
- Ball State Univ., Muncie, IN (USA)
- OSTI ID:
- 6070317
- Report Number(s):
- N-8231109; NASA-CR-162050
- Country of Publication:
- United States
- Language:
- English
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