RT info:eu-repo/semantics/article
T1 Shadow-band radiometer measurement of diffuse solar irradiance: Calculation of geometrical and total correction factors
A1 Simón Martín, Miguel de
A1 Diez Mediavilla, Montserrat
A1 Alonso Tristán, Cristina
K1 Solar diffuse irradiance
K1 Shadow-band
K1 Instrumentation
K1 Correction factor
K1 Electrotecnia
K1 Electrical engineering
AB Among the various methods of measuring diffuse solar irradiance, shadowing devices are ones of themost 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, whichcan be a disk or a band (Drummond’s shadow-band), that prevents the direct incidence of solar beamirradiance on the sensor. This method is capable of precise measurements, but sensor outputs have tobe corrected, so as to quantify the amount of diffuse irradiance that the band blocks from reaching thesensor. Several authors have advanced different expressions for this correction factor, most of which onlyapply to horizontal and equator-oriented tilting pyranometers. In this work, we present a generalapproach to calculate the geometrical correction factor for a tilted sensor, oriented towards all possibleazimuth and zenith angles, which permits the measurement of solar diffuse irradiance on any tilted andoriented surfaces. Furthermore, five total correction models are adapted for measurement in any givendirection and evaluated on vertical walls pointing the four cardinal directions. Our results show that geometricalcorrection 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
PB Elsevier
SN 0038-092X
YR 2016
FD 2016-12
LK http://hdl.handle.net/10259/4756
UL http://hdl.handle.net/10259/4756
LA eng
NO Spanish Government (grant ENE2011-27511).
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024