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Título : Shadow-band radiometer measurement of diffuse solar irradiance: Calculation of geometrical and total correction factors
Autor : Simón Martín, Miguel de
Diez Mediavilla, Montserrat
Alonso Tristán, Cristina
Publicado en: Solar Energy. 2016, V. 139, p. 85-99
Editorial : Elsevier
Fecha de publicación : dic-2016
ISSN : 0038-092X
DOI: 10.1016/j.solener.2016.09.026
Resumen : Among the various methods of measuring diffuse solar irradiance, shadowing devices are ones of the most commonly used in solar research all over the world. These instruments work with a basic pyranometer, properly calibrated for the measurement of solar irradiance, with a shadowing element, which can be a disk or a band (Drummond’s shadow-band), that prevents the direct incidence of solar beam irradiance on the sensor. This method is capable of precise measurements, but sensor outputs have to be corrected, so as to quantify the amount of diffuse irradiance that the band blocks from reaching the sensor. Several authors have advanced different expressions for this correction factor, most of which only apply to horizontal and equator-oriented tilting pyranometers. In this work, we present a general approach to calculate the geometrical correction factor for a tilted sensor, oriented towards all possible azimuth and zenith angles, which permits the measurement of solar diffuse irradiance on any tilted and oriented surfaces. Furthermore, five total correction models are adapted for measurement in any given direction and evaluated on vertical walls pointing the four cardinal directions. Our results show that geometrical correction improves the Mean Bias Difference (MBD), the Root Mean Squared Difference (RMSD) and the l0:99 statistics by 60%, 62% and 56%, respectively, in contrast with the raw data. The LeBaron et al. model gives the most accurate figure for total correction according to MBD, RMSD and l0:99 statistics, with promising average performances of 97%, 91%, and 96%, respectively
Palabras clave: Solar diffuse irradiance
Correction factor
Materia: Ingeniería eléctrica
Electric engineering
Licencia: http://creativecommons.org/licenses/by-nc-nd/4.0/
URI : http://hdl.handle.net/10259/4756
Versión del editor: https://doi.org/10.1016/j.solener.2016.09.026
Aparece en las colecciones: Artículos SWIFT

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