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Double-tailored nonimaging reflector optics for maximum-performance solar concentration.

Alex Goldstein¹, Jeffrey M Gordon

¹Department of Solar Energy and Environmental Physics, Blaustein Institutes for Desert Research,Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|September 3, 2010

Summary

This study explores nonimaging optics, tailoring mirror shapes for solar energy concentration. It identifies limitations and categories of double-tailored optics, with examples achieving high concentration and wide acceptance angles.

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Area of Science:

Optics and Photonics
Solar Energy Engineering

Background:

Nonimaging optics are crucial for solar applications requiring a gap between optic and absorber.
Existing methods face limitations in achieving maximum concentration near the étendue limit.

Purpose of the Study:

To explore a nonimaging strategy for tailoring two mirror contours for concentration.
To identify limitations of the simultaneous multiple surface method.
To categorize double-tailored reflective optics and assess their concentration potential.

Main Methods:

Developing a nonimaging strategy to tailor two mirror contours.
Applying the edge-ray principle to define phase space boundaries.
Analyzing the fundamental categories of double-tailored reflective optics.

Main Results:

Subtle limitations of the simultaneous multiple surface method were derived.
Fundamental categories of double-tailored reflective optics were identified.
A minority of designs pragmatically offer maximum concentration at high collection efficiency.

Conclusions:

The study confirms that specific double-tailored optics can achieve high flux concentration (approx. 1000) with large acceptance half-angles (up to 30 mrad).
This approach is suitable for solar applications demanding a significant optic-absorber gap.