Optical In-Situ Assessment of a Nonimaging Secondary Concentrator in a Solar Tower

[+] Author and Article Information
Abraham Kribus

Environmental Sciences and Energy Research Department, Weizmann Institute of Science, Rehovot 76100, Israele-mail: avi.kribus@weizmann.ac.il

Andreas Timinger

Optics & Energy Concepts, Paul-Gerhardt-Allee 42, D-81245 Munich, Germany

J. Sol. Energy Eng 124(3), 223-229 (Aug 01, 2002) (7 pages) doi:10.1115/1.1488668 History: Received November 01, 2000; Revised February 01, 2002; Online August 01, 2002
Copyright © 2002 by ASME
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(a) The geometry of the rectangular concentrator used for the remote in-situ measurement. Eight plane facets of trapezoidal shape interconnect a rectangular entrance aperture and a rectangular exit aperture. (b) Representative rays entering the aperture through a transmission region (white) and a rejection region (hatched); white circles indicate the points of penetration at the inlet aperture. Rays 1 and 2 reach the exit aperture directly and after one reflection, respectively. Ray 3 is rejected after two reflections.
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(a) The layout of the Weizmann Institute heliostat field. The positions of the heliostats are marked as squares. The lines are equal transmission contours as predicted by ray-tracing simulations. The positions of observation for the measurement are shown as numbered dots. (b) The measurement system.
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Transmission pattern photograph corresponding to position 1. Transmission regions are the two relatively uniform horizontal gray strips (bright orange in the original color photograph).
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Photographs of the transmission patterns after pre-processing. Numbers indicate the positions of observation. The different resolution of the photographs is due to the different camera distance to the concentrator for the different positions within the field.
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(a) Simulated transmission pattern for the observation position 1. Gray levels correspond to different numbers of reflections. (b) The differences between the measured and simulated patterns; simulated geometry of the concentrator was according to the original design.
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Pixel mismatch and the difference in geometric transmission for observation position 1. (a) Variation of the axial position of the intermediate aperture in the geometry used for the simulation; (b) Variation of tilt angle of the concentrator axis downward from horizontal. Mismatch 1: pixels when the simulation is bright but the measurement is not. Mismatch 2: pixels where the measurement is bright but the simulation is not.
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Total pixel mismatch before and after the optimization of the position for the intermediate aperture L1. The tilt angle of the concentrator axis has already been optimized.



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