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Calibration methods for rotating shadowband irradiometers and optimizing the calibration duration

Jessen, Wilko and Wilbert, Stefan and Nouri, Bijan and Geuder, Norbert and Fritz, H. (2016) Calibration methods for rotating shadowband irradiometers and optimizing the calibration duration. Atmospheric Measurement Techniques, 9, pp. 1601-1612. Copernicus Publications. doi: 10.5194/amt-9-1601-2016. ISSN 1867-1381.

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Official URL: http://www.atmos-meas-tech.net/9/1601/2016/


Resource assessment for concentrated solar power (CSP) needs accurate direct normal irradiance (DNI) measurements. An option for such measurement campaigns is the use of thoroughly calibrated rotating shadowband irradiometers (RSIs). Calibration of RSIs and Si-sensors is complex because of the inhomogeneous spectral response of these sensors and incorporates the use of several correction functions. One calibration for a given atmospheric condition and air mass might not be suitable under different conditions. This paper covers procedures and requirements of two calibration methods for the calibration of rotating shadowband irradiometers. The necessary duration of acquisition of test measurements is examined with regard to the site-specific conditions at Plataforma Solar de Almería (PSA) in Spain. Seven data sets of long-term test measurements were collected. For each data set, calibration results of varying durations were compared to its respective long-term result. Our findings show that seasonal changes of environmental conditions are causing small but noticeable fluctuation of calibration results. Calibration results within certain periods (i.e. November to January and April to May) show a higher likelihood of deviation. These effects can partially be attenuated by including more measurements from outside these periods. Consequently, the duration of calibrations at PSA can now be selected depending on the time of year in which measurements commence.

Item URL in elib:https://elib.dlr.de/108962/
Document Type:Article
Title:Calibration methods for rotating shadowband irradiometers and optimizing the calibration duration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wilbert, StefanUNSPECIFIEDhttps://orcid.org/0000-0003-3573-3004UNSPECIFIED
Nouri, BijanUNSPECIFIEDhttps://orcid.org/0000-0002-9891-1974UNSPECIFIED
Date:April 2016
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1601-1612
Publisher:Copernicus Publications
Keywords:rotating shadowband irradiometers, calibration
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Impact of Desert Environment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:05 Dec 2016 14:34
Last Modified:08 Nov 2023 15:23

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