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Measurement of DNI Angular Distribution with a Sunshape Profiling Irradiometer

Armstrong, Peter and Kalapatapu, Ragini and Chiesa, Matteo and Wilbert, Stefan (2012) Measurement of DNI Angular Distribution with a Sunshape Profiling Irradiometer. SolarPACES 2012, 11.-14. Sept. 2012, Marrakesch, Marokko.

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Abstract

A low cost, field-deployable instrument for retrieving the radial profile of solar radiance across the sun´s disk and trough the circumsolar region is described. A prototype of the sunshape Profiling Irradiometer (SPI) has been built by modifying a stepping.motor-based Rotating Shadowband Irradiometer (RSI) with straghtforward changes to the control and data collection program and mechanical modifications that are novel but simple. A slit, rather than circular, reciever aperture is disposed on the bank axis such that penumbra crosses the aperture with a very small angualar displacement of the shadowband. because a single detectzor with diffusing fore-optic is used to generate the sunshape profiles, calibrationa nd soliling problems commonly associated with high resolution cameras are avoided. The circumsolar ratio (CSR) of the generated SPI trajectory is estimatedby finding the best match of the normalized measured profile to the family of simulated profiles using a single-parameter model. Results of CSRs obtained by this inverse method are compared to teh broadband CSR given by the sun aureole measurement system and sun photometer. Applications of SPI include optimizing concetration rations of CSP plants based on local CSR distiribution. adjusting normal-incidence- and IAM-test results for the direct normal irradiation (DNI) within a concentrator´s acceptance angele, and inferring aerosol distributions for climate studies or as input to remote sensing models.

Item URL in elib:https://elib.dlr.de/78577/
Document Type:Conference or Workshop Item (Paper)
Title:Measurement of DNI Angular Distribution with a Sunshape Profiling Irradiometer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Armstrong, Peterparmstrong (at) masdar.ac.aeUNSPECIFIED
Kalapatapu, RaginiMasdar InstituteUNSPECIFIED
Chiesa, MatteoMasdar InstituteUNSPECIFIED
Wilbert, Stefanstefan.wilbert (at) dlr.deUNSPECIFIED
Date:11 September 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:sunshape retrieval, cirumsolar, aerosol, scattering, DNI, CSR; angular distribution
Event Title:SolarPACES 2012
Event Location:Marrakesch, Marokko
Event Type:international Conference
Event Dates:11.-14. Sept. 2012
Organizer:IEA SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:06 Dec 2012 17:19
Last Modified:12 Dec 2013 21:51

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