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Sunshape Measurements with Conventional Rotating Shadowband Irradiometers

Wilbert, Stefan and Röger, Marc and Csambor, Jonas and Breitbach, M. and Klinger, Florian and Nouri, Bijan and Hanrieder, Natalie and Wolfertstetter, Fabian and Schüler, David and Shaswattam, S. and Goswami, N and Kumar, S. and Ghennioui, Abdellatif and Affolter, Roman and Geuder, Norbert and Kraas, Birk (2018) Sunshape Measurements with Conventional Rotating Shadowband Irradiometers. In: AIP Conference Proceedings, 2033 (190016). SolarPACES Conference, 26. - 29. Sep 2017, Santiago de Chile. DOI: 10.1063/1.5067201

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Official URL: https://aip.scitation.org/doi/10.1063/1.5067201


Because of forward scattered radiation in the atmosphere, the circumsolar region closely surrounding the solar disk looks very bright. The radiation coming from this region, the circumsolar radiation, is in large part included in direct normal irradiance (DNI) measurements at the usual 2.5° pyrheliometer opening half angle, but only partially intercepted by the receivers of focusing solar collectors. Therefore, circumsolar radiation measurements are recommended to be included in solar resource assessment. Circumsolar radiation can be characterized using the radial angular distribution of the radiance around the center of the sun – the so-called sunshape. Several sunshape measurement methods have been developed recently. Most approaches use cameras or pyrheliometers with different apertures which require daily maintenance. The Rotating Shadowband Irradiometer (RSI) based method discussed here uses a conventional RSI without any hardware modification to enable sunshape measurements without affecting the RSI’s fundamental function as a DNI measurement device. Thus, it allows to measure circumsolar radiation without any additional hardware and with significantly lower maintenance requirements. The presented RSI-based sunshape measurement algorithm has been validated with four RSIs and more than two years of data. After a short description of the method to derive the circumsolar contribution, the validation results are shown. Then the required calibration method is discussed, followed by the results from the measurement campaigns at four sites in Spain, India and Morocco. It was found that no individual calibration is required per instrument and the algorithm can be used for automatic data processing so that common RSI stations can measure the sunshape with comparably low extra effort. Furthermore, we explain how to derive sunshapes from the RSI measurements.

Item URL in elib:https://elib.dlr.de/115646/
Document Type:Conference or Workshop Item (Speech)
Title:Sunshape Measurements with Conventional Rotating Shadowband Irradiometers
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wilbert, StefanStefan.Wilbert (at) dlr.dehttps://orcid.org/0000-0003-3573-3004
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Csambor, Jonassf-qlfUNSPECIFIED
Klinger, Floriansf-qlfUNSPECIFIED
Nouri, BijanBijan.Nouri (at) dlr.deUNSPECIFIED
Hanrieder, Natalienatalie.hanrieder (at) dlr.dehttps://orcid.org/0000-0002-9671-351X
Wolfertstetter, Fabianfabian.wolfertstetter (at) dlr.dehttps://orcid.org/0000-0003-4323-8433
Ghennioui, AbdellatifiresenUNSPECIFIED
Affolter, Romancsp servicesUNSPECIFIED
Geuder, NorbertNorbert.Geuder (at) dlr.deUNSPECIFIED
Kraas, Birkcsp servicesUNSPECIFIED
Date:8 November 2018
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1063/1.5067201
Keywords:RSI, irradiance, circumsolar, sunshape
Event Title:SolarPACES Conference
Event Location:Santiago de Chile
Event Type:international Conference
Event Dates:26. - 29. Sep 2017
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2017 14:07
Last Modified:08 Nov 2019 03:00

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