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Experimental Verification of Optical Modeling of Parabolic Trough Collectors by Flux Measurement

Schiricke, Björn and Pitz-Paal, Robert and Lüpfert, Eckhard and Pottler, Klaus and Pfänder, Markus and Riffelmann, Klaus-Jürgen and Neumann, Andreas (2008) Experimental Verification of Optical Modeling of Parabolic Trough Collectors by Flux Measurement. Journal of Solar Energy Engineering, 131 (1). DOI: 10.1115/1.3027507.

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In order to optimize the solar field output of parabolic trough collectors (PTCs), 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 verified 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 charged coupled device 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 the Plataforma Solar de Almería. The verification 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:Article
Title:Experimental Verification of Optical Modeling of Parabolic Trough Collectors by Flux Measurement
AuthorsInstitution or Email of Authors
Schiricke, BjörnUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIED
Lüpfert, EckhardUNSPECIFIED
Pfänder, MarkusUNSPECIFIED
Riffelmann, Klaus-JürgenFlagsol GmbH
Neumann, AndreasSolar Systems Pty Ltd
Date:6 January 2008
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In ISI Web of Science:Yes
Keywords:Solarthermische Kraftwerke – Parabolrinnenkollektoren – PTC – Strahlverfolgung – Interceptfaktor – Strahlungsflussdichte – Modellierung – Simulation – Messung
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
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Dr. Björn Schiricke
Deposited On:26 Feb 2009
Last Modified:15 Jan 2010 00:50

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