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.
|Title:||Experimental Verification of Optical Modeling of Parabolic Trough Collectors by Flux Measurement|
|Date:||06 January 2008|
|Journal or Publication Title:||Journal of Solar Energy Engineering|
|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|
|DLR - Research area:||Energy|
|DLR - Program:||E SF - Solar research|
|DLR - Research theme (Project):||E - Qualifizierung (old)|
|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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