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Title: Design and construction of a one-axis sun-tracking system
Authors: Kalogirou, Soteris A. 
Keywords: Tracking system
Issue Date: 1996
Publisher: Elsevier B. V.
Source: Solar Energy, Vol. 57, no. 6, 1996, pp. 465-469
Abstract: This paper describes a tracking system which can be used with single-axis solar concentrating systems. The position and “status” of the Sun are detected by three light-dependent resistors (LDRs), one of which detects whether the collector is focused, whilst a second resistor determines if there is cloud cover, and the third senses whether it is day or night. The resultant signals are fed to an electronic control system which operates a low-speed 12-V d.c. motor which rotates the collector via a speed-reduction gearbox. The tracking system accuracy depends on the magnitude of the solar irradiance. The deviation from zero is 0.2 and 0.05° with solar radiation of 100 and 600 W m−2, respectively. Both values suggest that the mechanism can be used satisfactorily for parabolic trough collectors of medium to high concentration ratios.
ISSN: 0038-092X
DOI: 10.1016/S0038-092X(96)00135-1
Rights: Copyright © 1997 Published by Elsevier Science Ltd.
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