Comparison of direct normal irradiance derived from silicon and thermopile global hemispherical radiation detectors

Daryl R. Myers

doi:10.1117/12.859732

19 August 2010 Comparison of direct normal irradiance derived from silicon and thermopile global hemispherical radiation detectors

Daryl R. Myers

Author Affiliations +

Proceedings Volume 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III; 77730G (2010) https://doi.org/10.1117/12.859732
Event: SPIE Solar Energy + Technology, 2010, San Diego, California, United States

Abstract

Concentrating solar applications utilize direct normal irradiance (DNI) radiation, a measurement rarely available. The solar concentrator industry has begun to deploy numerous measurement stations to prospect for suitable system deployment sites. Rotating shadowband radiometers (RSR) using silicon photodiodes as detectors are typically deployed. This paper compares direct beam estimates from RSR to a total hemispherical measuring radiometer (SPN1) multiple fast thermopiles. These detectors simultaneously measure total and diffuse radiation from which DNI can be computed. Both the SPN1 and RSR-derived DNI are compared to DNI measured with thermopile pyrheliometers. Our comparison shows that the SPN1 radiometer DNI estimated uncertainty is somewhat greater than, and on the same order as, the RSR DNI estimates for DNI magnitudes useful to concentrator technologies.

Citation Download Citation

Daryl R. Myers "Comparison of direct normal irradiance derived from silicon and thermopile global hemispherical radiation detectors", Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730G (19 August 2010); https://doi.org/10.1117/12.859732

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