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Validation of optical modeling of parabolic trough collectors by flux measurement

Schiricke, Björn and Pitz-Paal, Robert and Lüpfert, Eckhard and Neumann, Andreas and Pottler, Klaus and Pfänder, Markus and Riffelmann, Klaus-Jürgen (2007) Validation of optical modeling of parabolic trough collectors by flux measurement. In: Energy Sustainability 2007. ES2007, 2007-06-27 - 2007-06-30, Long Beach, Ca (USA).

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Abstract

In order to optimize the solar field output of parabolic trough collectors (PTC) it is essential to study the influence of collector and absorber geometry on the optical performance. The optical ray-tracing model of PTC conceived for this purpose uses photogrammetrically measured concentrator geometry in commercial Monte Carlo ray tracing software. The model has been validated with measurements of a scanning flux measurement system, measuring the solar flux density distribution close to the focal line of the PTC. The tool uses fiber optics and a CCD-camera to scan the focal area of a PTC module. Since it is able to quantitatively detect spilled light with good spatial resolution it provides an evaluation of the optical efficiency of the PTC. For comparison of ray tracing predictions with measurements, both flux maps and collector geometry have been measured under identical conditions on the Eurotrough prototype collector at PSA. The validation of the model is provided by three methods: the comparison of measured intercept factors with corresponding simulations; comparison of measured flux density distributions with corresponding ray tracing predictions; and comparison of thermographically measured temperature distribution on the absorber surface with flux density distribution predicted for this surface. Examples of sensitivity studies performed with the validated model are shown.

Document Type:Conference or Workshop Item (Paper)
Title:Validation of optical modeling of parabolic trough collectors by flux measurement
Authors:
AuthorsInstitution or Email of Authors
Schiricke, BjörnUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIED
Lüpfert, EckhardUNSPECIFIED
Neumann, AndreasUNSPECIFIED
Pottler, KlausUNSPECIFIED
Pfänder, MarkusUNSPECIFIED
Riffelmann, Klaus-JürgenFlagsol GmbH
Date:27 June 2007
Journal or Publication Title:Energy Sustainability 2007
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:parabolic trough collector, PTC, optical performance, ray-tracing model, concentrator geometry, flux measurement, flux density distribution, fiber optics, Eurotrough, intercept factors, absorber surface
Event Title:ES2007
Event Location:Long Beach, Ca (USA)
Event Type:international Conference
Event Dates:2007-06-27 - 2007-06-30
Organizer:ASME
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: Köln-Porz , other
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Dr. Björn Schiricke
Deposited On:11 Jan 2008
Last Modified:27 Apr 2009 14:20

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