Recent Progress in Reducing the Uncertainty in and Improving Pyranometer Calibrations

[+] Author and Article Information
Daryl R. Myers, Thomas L. Stoffel, Ibrahim Reda, Stephen M. Wilcox, Afshin M. Andreas

National Renewable Energy Laboratory, Distributed Energy Resources Center, 1617 Cole Blvd., Golden, CO 80401

J. Sol. Energy Eng 124(1), 44-50 (Apr 01, 2001) (7 pages) doi:10.1115/1.1434262 History: Revised April 01, 2001; Received October 01, 2001
Copyright © 2002 by ASME
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Pyrheliometers measuring direct-normal solar radiation
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Pyranometer measuring total global hemispherical radiation
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Shade/Unshade and component summation calibrations
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ASTM sequence for shade/unshade calibration procedures
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Tracking shading disks for pyranometer measurement of diffuse-sky radiation
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All-black (top unit) and black-and-white thermopile pyranometers under tracking shading disks
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Black-and-White (top line) and all-black sensor clear sky diffuse irradiance demonstrating 20 W/m2 thermal offset in all-black pyranometer
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Reference global, direct, and diffuse components (top); Ratio of diffuse-sky irradiance to total global reference irradiance (bottom)
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Typical meteorological data for RCC data collection. Aerosol optical depth or turbidity (top), relative humidity (middle), and ambient temperature (bottom)
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Pyranometer cosine response curve generated by RCC. Morning data is top leg, afternoon data the bottom leg. Horizontal bars are mean responsivity in zenith angle ranges spanned by the bars.
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Top curve (GLO PSP) is measured global irradiance using a single responsivity. The next curve down (thick black line, Gcor[Z]) is the corrected data using responsivity for the appropriate zenith-angle bin. The third line down (thin gray line, B&W+DN GLO) is the computed irradiance from beam and diffuse.



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