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Techniques to Measure Solar Flux Density Distribution on Large-Scale Receivers

Röger, Marc and Herrmann, Patrik and Ulmer, Steffen and Ebert, Miriam and Prahl, Christoph and Göhring, Felix (2014) Techniques to Measure Solar Flux Density Distribution on Large-Scale Receivers. Journal of Solar Energy Engineering (136), 031013-1. DOI: 10.1115/1.4027261. ISSN 0199-6231.

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Abstract

Flux density measurement applied to central receiver ystems delivers the spatial distribution of the concentrated solar radiation on the receiver aperture, measures receiver input power, and monitors and might control heliostat aimpoints. Commercial solar tower plants have much larger aperture surfaces than the receiver prototypes tested in earlier research and development (R&D) projects. Existing methods to measure the solar flux density in the receiver aperture face new challenges regarding the receiver size. Also, the requirements regarding costs, accuracy, spatial resolution, and measuring speed are different. This paper summarizes existent concepts, presents recent research results for techniques that can be applied to large-scale receivers and assesses them against a catalog of requirements. Direct and indirect moving bar techniques offer high measurement accuracy, but also have the disadvantage of large moving parts on a solar tower. In the case of external receivers, measuring directly on receiver surfaces avoids moving parts and allows continuous measurement but may be not as precise. This promising technique requires proper scientific evaluation due to specific reflectance properties of current receiver materials. Measurement-supported simulation techniques can also be applied to cavity receivers without installing moving parts. They have reasonable uncertainties under ideal conditions and require comparatively low effort.

Document Type:Article
Title:Techniques to Measure Solar Flux Density Distribution on Large-Scale Receivers
Authors:
AuthorsInstitution or Email of Authors
Röger, Marcmarc.roeger@dlr.de
Herrmann, PatrikUNSPECIFIED
Ulmer, SteffenUNSPECIFIED
Ebert, MiriamUNSPECIFIED
Prahl, Christophchristoph.prahl@dlr.de
Göhring, Felixfelix.goehring@dlr.de
Date:August 2014
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1115/1.4027261
Page Range:031013-1
ISSN:0199-6231
Status:Published
Keywords:flux density measurement, receiver input power, central receiver system, solar tower
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems
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: Anja Kruschinski
Deposited On:07 Aug 2014 15:47
Last Modified:07 Aug 2014 15:47

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