19 August 2010 A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure
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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.
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Michael J. Brooks, Michael J. Brooks, Lance W. Roberts, Lance W. Roberts, } "A data processing algorithm for the perforated shadow band incorporating a ray trace model of pyranometer exposure", Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730W (19 August 2010); doi: 10.1117/12.860123; https://doi.org/10.1117/12.860123
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