NTRS - NASA Technical Reports Server

Back to Results
Reduction of intensity variations on a photovoltaic array with compound parabolic concentratorsThe reduction of nonuniformities in the intensity distribution of light focused on a photovoltaic array by a compound parabolic concentrator is investigated. The introduction of small distortions into the surfaces of the reflector in order to diffuse the incident collimated light to fill the angular acceptance of the concentrator is calculated by means of ray tracing to decrease the irradiance nonuniformity at the cost of a lowered effective concentration of the concentrator. Measurements of the intensity distribution on a scale test model in terrestrial sunlight with corrugated aluminized mylar reflectors are shown to be in good agreement with the ray tracing results. A two-stage concentrator consisting of a focusing primary and a nonimaging secondary is also shown to result in a fairly uniform intensity distribution except in the case of a 4-deg incidence angle, which may be corrected by the introduction of distortions into one or both concentration stages.
Document ID
Document Type
Conference Proceedings
Greenman, P.
(Chicago State Univ. Chicago, IL, United States)
Ogallagher, J.
(Chicago State Univ. Chicago, IL, United States)
Winston, R.
(Chicago, University Chicago, Ill., United States)
Costogue, E.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
Energy Production And Conversion
Meeting Information
Meeting: Sun II
Location: Atlanta, GA
Start Date: May 28, 1979
End Date: June 1, 1979
Accession Number
Funding Number(s)
Distribution Limits

Available Downloads

There are no available downloads for this record.
No Preview Available