Technical Briefs

Tracking Speed Analysis for Heliostat Using Spinning-Elevation Tracking Mode

[+] Author and Article Information
Li Li

Joint Advanced Research Center in Suzhou, University of Science and Technology of China and City University of Hong Kong, Dushu Lake Higher Education Town, Suzhou 215123, China;Science Research Center,  Harbin Institute of Technology, Yi-Kuang Street, Nan-Gang District, Harbin 150080, Chinaleeeee@mail.ustc.edu.cn

Chern Sing Lim

Department of Astronomy and Applied Physics, University of Science and Technology of China, Jinzhai Road, Hefei 230026, Chinacslim@ustc.edu.cn

J. Sol. Energy Eng 131(3), 034501 (Jul 15, 2009) (4 pages) doi:10.1115/1.3142829 History: Received April 15, 2008; Revised March 01, 2009; Published July 15, 2009

This paper discusses the tracking speed for different types of sun tracking algorithms, particularly the latitude-oriented spinning-elevation tracking mode in the solar energy application. It is found that the tracking speed of the spinning axis of a latitude-oriented type of heliostat varies drastically during solar noon around days of equinox. We analyze the time intervals during which the heliostat requires faster tracking speed and discuss the causes and possible solutions.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

The changes of rotation angle ρH and θH in latitude-oriented azimuth-elevation heliostat

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Figure 2

The changes of rotation angle ρH and θH in latitude-oriented spinning-elevation heliostat

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Figure 3

The changes of rotation angle ρH and θH in polar-oriented spinning-elevation heliostat

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Figure 4

Difference of ρH between instantaneous position and theoretical value in a day, for motor with speed of 5 deg/min (left) and 15 deg/min (right) for latitude-oriented spinning-elevation tracking method

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Figure 5

Fast tracking period in a year for different motors

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Figure 6

Sun path in the sky sphere




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