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Proceedings Paper

Testing a model of IR radiative losses
Author(s): Frank Vignola; Charles N. Long; Ibrahim Reda
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Paper Abstract

Thermopile pyranometers exhibit IR radiative losses that affect global and diffuse shortwave measurements made with first class thermopile based instruments. Pyrgeometers can be used to measure the sky temperature and are used to calculate the pyranometer's IR radiative losses. Few solar monitoring sites are equipped with pyrgeometers necessary to account for the IR radiative losses associated with the pyranometers. High quality data from the Solar Radiation Research Laboratory (SRRL) at the National Renewable Energy Laboratory are used to test and further develop a model for the IR radiative losses without the use of pyrgeometer data. The various methods for obtaining IR radiative loss values are compared and contrasted using the SRRL data. A simple scaling method is proposed and tested to adjust the non-pyrgeometer based correlation models to sites with different sky temperature characteristics.

Paper Details

Date Published: 20 August 2009
PDF: 8 pages
Proc. SPIE 7410, Optical Modeling and Measurements for Solar Energy Systems III, 741003 (20 August 2009); doi: 10.1117/12.826325
Show Author Affiliations
Frank Vignola, Univ. of Oregon (United States)
Charles N. Long, Pacific Northwest National Lab. (United States)
Ibrahim Reda, National Renewable Energy Lab. (United States)

Published in SPIE Proceedings Vol. 7410:
Optical Modeling and Measurements for Solar Energy Systems III
Benjamin K. Tsai, Editor(s)

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