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Flux Density Measurement on Large-Scale Receivers

Röger, Marc and Herrmann, Patrik and Ebert, Miriam and Prahl, Christoph and Ulmer, Steffen and Göhring, Felix (2011) Flux Density Measurement on Large-Scale Receivers. In: Proc. of SolarPACES 2011. SolarPACES 2011, Sept. 20-23, 2011, Granada, Spain.

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Abstract

Commercial solar tower plants have much larger aperture surfaces than the receiver prototypes tested in earlier 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. Flux density measurement delivers the spatial distribution of the concentrated solar radiation on a receiver aperture, measures receiver input power, and monitors and might control heliostat aimpoints. This paper resumes existent concepts, presents new ones and evaluates them against a catalogue 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 is not as precise. This promising technique requires, due to specific reflectance properties of current receiver materials, proper scientific evaluation. 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:Conference or Workshop Item (Speech, Paper)
Title:Flux Density Measurement on Large-Scale Receivers
Authors:
AuthorsInstitution or Email of Authors
Röger, MarcDLR
Herrmann, PatrikUNSPECIFIED
Ebert, MiriamDLR
Prahl, ChristophDLR
Ulmer, SteffenDLR
Göhring, FelixDLR
Date:September 2011
Journal or Publication Title:Proc. of SolarPACES 2011
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:flux density measurement, receiver input power, central receiver system, solar tower
Event Title:SolarPACES 2011
Event Location:Granada, Spain
Event Type:international Conference
Event Dates:Sept. 20-23, 2011
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: other
Institutes and Institutions:Institute of Solar Research
Deposited By: Marc Röger
Deposited On:15 Dec 2011 14:07
Last Modified:12 Dec 2013 21:29

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