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.
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ASME 2007 Energy Sustainability Conference
July 27–30, 2007
Long Beach, California, USA
Conference Sponsors:
- Solar Energy Division and Advanced Energy Systems Division
ISBN:
0-7918-4797-7
PROCEEDINGS PAPER
Validation of Optical Modeling of Parabolic Trough Collectors by Flux Measurement
Bjo¨rn Schiricke,
Bjo¨rn Schiricke
DLR – German Aerospace Center, Ko¨ln, Germany
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Robert Pitz-Paal,
Robert Pitz-Paal
DLR – German Aerospace Center, Ko¨ln, Germany
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Eckhard Lu¨pfert,
Eckhard Lu¨pfert
DLR – German Aerospace Center, Ko¨ln, Germany
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Andreas Neumann,
Andreas Neumann
DLR – German Aerospace Center, Ko¨ln, Germany
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Klaus Pottler,
Klaus Pottler
DLR – German Aerospace Center, Tabernas, Almeri´a, Spain
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Markus Pfa¨nder,
Markus Pfa¨nder
DLR – German Aerospace Center, Tabernas, Almeri´a, Spain
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Klaus-Ju¨rgen Riffelmann
Klaus-Ju¨rgen Riffelmann
Flagsol GmbH, Ko¨ln, Germany
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Bjo¨rn Schiricke
DLR – German Aerospace Center, Ko¨ln, Germany
Robert Pitz-Paal
DLR – German Aerospace Center, Ko¨ln, Germany
Eckhard Lu¨pfert
DLR – German Aerospace Center, Ko¨ln, Germany
Andreas Neumann
DLR – German Aerospace Center, Ko¨ln, Germany
Klaus Pottler
DLR – German Aerospace Center, Tabernas, Almeri´a, Spain
Markus Pfa¨nder
DLR – German Aerospace Center, Tabernas, Almeri´a, Spain
Klaus-Ju¨rgen Riffelmann
Flagsol GmbH, Ko¨ln, Germany
Paper No:
ES2007-36216, pp. 1071-1076; 6 pages
Published Online:
February 24, 2009
Citation
Schiricke, B, Pitz-Paal, R, Lu¨pfert, E, Neumann, A, Pottler, K, Pfa¨nder, M, & Riffelmann, K. "Validation of Optical Modeling of Parabolic Trough Collectors by Flux Measurement." Proceedings of the ASME 2007 Energy Sustainability Conference. ASME 2007 Energy Sustainability Conference. Long Beach, California, USA. July 27–30, 2007. pp. 1071-1076. ASME. https://doi.org/10.1115/ES2007-36216
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