Björn Schiricke
German Aerospace Center
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Featured researches published by Björn Schiricke.
Journal of Solar Energy Engineering-transactions of The Asme | 2007
Eckhard Lüpfert; Klaus Pottler; Steffen Ulmer; Klaus-J. Riffelmann; Andreas Neumann; Björn Schiricke
Analysis of geometry and optical properties of solar parabolic trough collectors uses a number of specific techniques that have demonstrated to be useful tools in prototype evaluation. These are based on photogrammetry, flux mapping, ray tracing, and advanced thermal testing. They can be used to assure the collector quality during construction and for acceptance tests of the solar field. The methods have been applied on EuroTrough collectors, cross checked, and compared. This paper summarizes results in collector shape measurement, flux measurement, ray tracing, and thermal performance analysis for parabolic troughs. It is shown that the measurement methods and the parameter analysis give consistent results. The interpretation of the results and their annual evaluation give hints on identified relevant improvement potentials for the following generation of solar power plant collectors.
Journal of Solar Energy Engineering-transactions of The Asme | 2009
Björn Schiricke; Robert Pitz-Paal; Eckhard Lüpfert; Klaus Pottler; Markus Pfänder; Klaus-Jürgen Riffelmann; Andreas Neumann
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 Almeria. 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.
SOLARPACES 2016: International Conference on Concentrating Solar Power and Chemical Energy Systems | 2017
Timo Effertz; Johannes Pernpeintner; Björn Schiricke
At DLR’s QUARZ Center a test bench has been established to measure, using steady state calorimetric method, the total hemispherical emittance of cylindrical solar thermal absorber samples at temperatures up to 450 °C. Emittance measurement of solar absorber surfaces is commonly performed by direct-hemispherical reflectance measurements with spectrophotometers. However, the measurement of cylindrical samples with spectrophotometers can be considered still a challenge as integrating spheres, reference samples and calibration services by national metrology institutions are optimized for flat sample measurement. Additionally samples are typically measured at room temperature. The steady state calorimetric method does not rely on reference samples and the measurement is performed at operating temperature. In the steady state calorimetric method electrical power input used to heat the sample is equated to the radiative heat loss from a heated sample to the environment. The total emittance can be calculated usin...
SOLARPACES 2016: International Conference on Concentrating Solar Power and Chemical Energy Systems | 2017
Johannes Pernpeintner; Björn Schiricke; Fabienne Sallaberry; Alberto García de Jalón; Rafael López-Martín; Loreto Valenzuela; Antonio de Luca; Andreas Georg
A round robin for parabolic trough receiver heat loss and optical efficiency in the laboratory was performed between five institutions using five receivers in 2015/2016. Heat loss testing was performed at three cartridge heater test benches and one Joule heating test bench in the temperature range between 100 °C and 550 °C. Optical efficiency testing was performed with two spectrometric test bench and one calorimetric test bench. Heat loss testing results showed standard deviations at the order of 6% to 12 % for most temperatures and receivers and a standard deviation of 17 % for one receiver at 100 °C. Optical efficiency is presented normalized for laboratories showing standard deviations of 0.3 % to 1.3 % depending on the receiver.
international conference on fuel cell science engineering and technology fuelcell collocated with asme international conference on energy sustainability | 2012
Siw Meiser; Christoph Kleine-Büning; Ralf Uhlig; Eckhard Lüpfert; Björn Schiricke; Robert Pitz-Paal
Deviations from the ideal shape of reflector panels for parabolic trough solar power plants have relevant impact on field efficiency and thus on the performance of the whole power plant. Analyzing the gravity-induced deformation of mirror shape for different mirror angles is relevant for performance calculation of solar parabolic trough collectors and identifying optimization potential of the mirror panels.Two mirror model versions (stiff and elastic supports) are evaluated in four angles: in horizontal laboratory angle (mirrors facing upward with mounting points horizontally aligned), and in 0°, 45° and 90° collector angle. The resulting slope maps are calculated in a separate post-processing.In order to evaluate the effect of gravity load on mirror shape, the deformed mirror in each evaluated angle is compared to the non-deformed mirror shape, and to the shapes in 0° (zenith) collector angle, respectively. The resulting slope deviation maps show the mirror deformation in different mirror angles. Stiffness of the mounting to the support structure has a relevant impact. Mirror deformation on elastic brackets (SDx up to 1.6 mrad) is much more pronounced than on an ideal stiff support structure (SDx up to 1.0 mrad).Copyright
Archive | 2006
Eckhard Lüpfert; Markus Pfänder; Björn Schiricke; Markus Eck
Archive | 2009
Johannes Pernpeintner; Björn Schiricke; Eckhard Lüpfert; Niels Lichtenthäler; Ansgar Macke; Karin Wiesemeyer
Energy Procedia | 2015
Johannes Pernpeintner; Christoph Happich; Eckhard Lüpfert; Björn Schiricke; Niels Lichtenthäler; Jan Weinhausen
Energy Procedia | 2015
Johannes Pernpeintner; Florian Sutter; Ch. Happich; Eckhard Lüpfert; Björn Schiricke; Niels Lichtenthäler; J. Thoss; F. Schumacher
Applied Energy | 2017
Siw Meiser; Simon Schneider; Eckhard Lüpfert; Björn Schiricke; Robert Pitz-Paal