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Proceedings Paper

A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure
Author(s): Michael J. Brooks; Lance W. Roberts
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Paper Abstract

A preliminary assessment of perforated shadow band performance is given under partly cloudy and overcast conditions. Decomposition of daily 1-minute pyranometer data into diffuse and global values and subsequent reconstitution of the separate curves is achieved using an interpolating algorithm and a ray trace model of pyranometer exposure. Accuracy of the reconstituted curves relative to reference data is a strong function of clearness index, KT, with a reduction in relative error for KT < 0.3 and KT > 0.7. As expected, algorithm performance degrades under highly variable conditions, when interpolation fails to capture the instantaneous fluctuations in irradiance associated with clouds drifting into the sun path.

Paper Details

Date Published: 19 August 2010
PDF: 9 pages
Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730W (19 August 2010); doi: 10.1117/12.860123
Show Author Affiliations
Michael J. Brooks, Univ. of KwaZulu-Natal (South Africa)
Lance W. Roberts, Univ. of KwaZulu-Natal (South Africa)

Published in SPIE Proceedings Vol. 7773:
Reliability of Photovoltaic Cells, Modules, Components, and Systems III
Neelkanth G. Dhere; John H. Wohlgemuth; Kevin Lynn, Editor(s)

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