Revising and Validating Spectral Irradiance Reference Standards for Photovoltaic Performance Evaluation

[+] Author and Article Information
Daryl R. Myers, Keith Emery

National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401

C. Gueymard

174 Bluebird Lane, Bailey, CO 80421e-mail: Chris@SolarConsultingServices.com

J. Sol. Energy Eng 126(1), 567-574 (Feb 12, 2004) (8 pages) doi:10.1115/1.1638784 History: Received April 01, 2003; Revised May 01, 2003; Online February 12, 2004
Copyright © 2004 by ASME
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ASTM direct (dash) and tilted hemispherical (line) spectra compared with mean measured FSEC (open square, n=120), PG&E (circle, n=20), and Denver (cross square, n=500) DNI spectra
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Percent difference between atmospheric transmittance predicted by SMARTS2 Version 2.8 and 2.9 and MODTRAN4 for the same ASTM-E891 (G159 Direct Normal) conditions
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Percent difference between SMARTS2 modeled spectra and LI-1800 measured spectrum compared with Spectroradiometer measurement uncertainty envelope
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SMARTS2 results smoothed to 5 nm resolution (lines) and measurements (symbols) at 5 nm resolution for 3 different air mass conditions on a clear day at NREL Sep 28 2001
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Present reference hemispherical tilt (HT), Normalized HT, and direct (DNI) ASTM G-159 standard spectra (symbols) compared with proposed SMARTS2 Ver. 2.9.2 modeled spectra (lines) for new reference condition AOD of 0.084 and light soil spectral albedo
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Solar geometry for reference spectral distributions. The solar azimuth is 180°, in the same plane as the normal to the “south facing” (in the northern hemisphere) surface tilted toward the equator. Normal to the tilted plane is n.
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World Meteorological Organization (WMO) Wehrli extraterrestrial (ETR) spectrum and ASTM G159 direct and Hemispherical, 37° south facing tilted surface spectra tabulated in the current standard




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