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Research Papers

Structural Design and Analysis of the Toroidal Heliostat

[+] Author and Article Information
Chuncheng Zang, Zhifeng Wang

Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, Chinazangchch@mail.iee.ac.cn

Wenfeng Liang

 Himin Solar Energy Group Co. Ltd., Dezhou, Shandong 253090, China

Xiaoyu Wang

Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

J. Sol. Energy Eng 132(4), 041007 (Oct 04, 2010) (6 pages) doi:10.1115/1.4002347 History: Received December 26, 2008; Revised July 26, 2010; Published October 04, 2010; Online October 04, 2010

Heliostat is an important component in the solar power tower station because its cost, optical performance, and mechanical performance have great influence on the overall property evaluation of the station. The T-shape heliostat tracking the sun in the azimuth-elevation mode has been commonly developed and successfully applied in many stations. In recent years, some researchers have developed spinning-elevation heliostats and have analyzed their optical performance. In this paper, the structure of a 16m2 toroidal heliostat tracking the sun in the spinning-elevation mode is designed, and the mechanical performance of the structure under wind load is analyzed by means of the finite element method. The trends of force, moments, and vibration modes with the change in elevation have been presented, and the classic status is analyzed in detail when their maximum values occur. Furthermore, the advantages and disadvantages of a toroidal heliostat in reducing the cost are discussed compared with those of a traditional T-shape heliostat.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Spinning-elevation sun-tracking heliostat

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Figure 2

Toroidal heliostat

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Figure 3

Back view of facet

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Figure 4

Support structure of reflector

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Figure 5

Optical image of the heliostat

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Figure 6

Flow of finite element analysis

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Figure 7

Natural frequency under different elevation

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Figure 8

Comparison of vibration frequency

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Figure 9

Mechanical performance under different elevations

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Figure 10

Mechanical performance of the toroidal heliostat when elevation is 0 deg

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Figure 11

Mechanical performance of the toroidal heliostat when elevation is 15 deg

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Figure 12

Distortion of support structure

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Figure 13

Difference between two kinds of heliostats

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Figure 14

Mechanical performance of the traditional heliostat

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