Maximally concentrating optics for photovoltaic solar energy conversion. Technical progress report, [July 1, 1985--February 15, 1986] [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1986. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 54 pages : digital, PDF file
- Additional Creators:
- United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- The use of a two-stage concentrator with a fresnel lens primary and a non-imaging dielectric totally internally reflecting secondary, has unique advantages for photovoltaic concentration. This new design has a much larger acceptance angle than the conventional lens-cell concentrating system. In the continuation of this research, an optimally designed prototype which employs a 13.6-cm diameter flat fresnel tons as the primary focusing device, a dielectric compound hyperbolic concentrator (DCHC) as secondary and a 1-cm diameter high-concentration cell for electricity conversion has been built, tested and analyzed. Measurements under sunlight show that it has an angular acceptance of ±3.6 degrees, which is dramatically better than the ±0.5 degree achievable without a secondary concentrator. This performance agrees well with theoretical ray-tracing predictions. The secondary shows an optical efficiency of (91±2)% at normal incidence. Combining with the primary fresnel tens which has an optical efficiency of (82±2)%, tho two-stage system yields a total optical efficiency of (7l±2)%. The measurement of the system electrical performance yielded a net electrical efficiency of 11.9%. No problems associated with non-uniform cell illumination were found, as evidenced by the excellent fill factor of (79±2)% measured under concentration. The secondary geometrical properties and the optimal two-stage design procedures for various primary- cell combinations were systematical studied. A general design principle has been developed.
- Published through SciTech Connect., 02/27/1986., "doe/ch/10201--t4", "DE93002845", Winston, R.; Ning, X.; O`Gallagher, J., and Chicago Univ., IL (United States). Enrico Fermi Inst.
- Type of Report and Period Covered Note:
- Annual; 01/01/1985 - 12/31/1986
- Funding Information:
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