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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Grahic Jump Location
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.
Grahic Jump Location
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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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
Grahic Jump Location
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
Grahic Jump Location
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
Grahic Jump Location
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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