Continuous Tracking of Heliostats

[+] Author and Article Information
Abraham Kribus

Dept. of Fluid Mechanics and Heat Transfer, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel

Irina Vishnevetsky, Moshe Meri, Amnon Yogev

Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel

Andrei Sytnik

Falcon Technologies, P.O. Box 57185, Tel Aviv 61571, Israel

J. Sol. Energy Eng 126(3), 842-849 (Jul 19, 2004) (8 pages) doi:10.1115/1.1668026 History: Received May 01, 2003; Online July 19, 2004
Copyright © 2004 by ASME
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Heliostat motor speed requirements for continuous tracking: (a) azimuth, (b) elevation.
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(a) Flux distribution and cumulative power on the target. C and P indicate the apertures of the central and peripheral units in a partitioned receiver, respectively. (b) Variation of the intercepted power by each aperture as a function of aiming error: a single large receiver (I), the central unit in a partitioned receiver (II), a peripheral unit in a partitioned receiver when the aim point drifts closer (III), a peripheral unit when the aim point drifts away (IV), the average of two opposite peripheral units (V).
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Modified heliostat motor with an external encoder mounted on the back shaft.
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Target and test platform: (a) side view, (b) front view of the target.
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(a) Variation of elevation and azimuth angles of the heliostat during continuous and step tracking. (b) Drift of the heliostat angles from the exact aiming.
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Variation of the radiometer measurements during periods of continuous and step tracking: (a) individual radiometers, (b) imbalance.
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Relative power collected by calorimeter. Vertical lines: beginning and end of step tracking.
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Variation of flux measured by the radiometers as a function of (a) elevation error, (b) azimuth error.
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Spectra of (a) calorimeter power, and (b) radiometer 1 and 2 measurement.




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