260407
20190619220053.0
0199-6231
doi
10.1115/1.4042227
1528-8986
ARTICLE
Inverse Analysis of Radiative Flux Maps for the Characterization of High Flux Sources
2019
2019
Journal Articles
The reconstruction of the angular and spatial intensity distribution from radiative flux maps measured in high flux solar simulators or optical concentrators is an ill-posed inverse problem requiring special solution strategies. We aimed at providing a solution strategy for the determination of intensity distributions of arbitrarily complicated concentrating facilities. The approach consists of the inverse reconstruction of the intensities from multiple radiative flux maps recorded at various positions around the focal plane. The approach was validated by three test cases including uniform spatial, Gaussian spatial, and uniform angular distribution for which we successfully predicted the intensity for a square-shaped target with edge length of 0.5 m and for a displacement range spanning 10 cm at a resolution of 3.2·106 elements, yielding relative errors between 19.8 – 26.4% and 15.7 – 25.6% when using Tikhonov regularization and the conjugate gradient least square method, respectively. The latter method showed superior performance and was used at a resolution of 20·106 elements to analyze EPFL’s high flux solar simulator comprising 18 lamps. The inverse solution for a single lamp retrieved from experimentally measured and simulated radiative flux maps showed peak intensities of 13.7 MW/m2/sr and 16.0 MW/m2/sr, respectively, with a relative error of 81.1%. The inverse reconstruction of the entire simulator by superimposing the single lamp intensities retrieved from simulated flux maps resulted in a maximum intensity of 18.8 MW/m2/sr with a relative error of 80%. The inverse method proved to provide reasonable intensity predictions with limited resolution of details imposed by the high gradients in the radiative flux maps.
250404
Suter, Clemens Gregor
275847
Meouchi Torbey, Antoine
248685
Levêque, Gaël Jean Clément
253760
247143
Haussener, Sophia
207354
141
2
021011
Journal of Solar Energy Engineering
sophia.haussener@epfl.ch
252472
sophia.haussener@epfl.ch
LRESE
U12656
oai:infoscience.epfl.ch:260407
STI
article
sophia.haussener@epfl.ch
pierre.devaud@epfl.ch
EPFL
REVIEWED
PUBLISHED
ARTICLE
overwrite