Silicon Purification by a New Type of Solar Furnace

Ying-Tian, Chen; Chern-Sing, Lim; Tso-hsiu, Ho; Boon-Han, Lim; Wang, Yinan

doi:10.1088/0256-307x/26/7/078103

Cited by 4 publications

References 5 publications

(5 reference statements)

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Non‐imaging Focusing Heliostat

Chong¹

2014

Advanced Energy Materials

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Overcoming astigmatism has always been a great challenge in designing a heliostat capable of focusing the sunlight on a small receiver throughout the year. In this chapter, a non-imaging focusing heliostat with dynamic adjustment of facet mirrors in a group manner is presented for optimizing the astigmatic correction in a wide range of incident angles. Non-imaging focusing heliostat that consists of m × n facet mirrors can carry out continuous astigmatic correction during sun-tracking with the use of only (m + n -2) controllers. A further simplifi ed astigmatic correction of non-imaging focusing heliostat is also discussed which reduces the number of controllers from (m + n -2) to only two. A detailed optical analysis is carried out and the simulated result has shown that the two-controller system can perform comparably well in astigmatic correction with a much simpler and more cost effective design. The new heliostat is not only designed to serve the purpose of concentrating sunlight to several hundreds of suns, but also to signifi cantly reduce the variation of solar fl ux distribution with incident angle.

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Non‐imaging Focusing Heliostat

Chong¹

2014

Advanced Energy Materials

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Latitude-orientated mode of non-imaging focusing heliostat using spinning-elevation tracking method

Lim

Chong

Lim³

et al. 2016

Solar Energy

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A Possible Macroscopic-Photo-Catalysis Mechanism in Solar Furnace

Tso-hsiu¹,

Cheng-Rui²,

Ying-Tian

2011

Commun. Theor. Phys.

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Based on the experimental results of Chen et al. to use the solar furnace and medium frequency induction furnace to extract boron impurity from metallurgical silicon, we propose a strong radiation catalysis mechanism to explain the difference of reaction rates in these two furnaces. The postulate assuming the photons striking on the material not only increase the thermal energy of the molecules of reactants but also lower down the energy barrier of the reaction to speed up the chemical reaction. It is believed the photon catalysis mechanism is universal in most of high temperature chemical reactions and looking forward to more evidences for the postulate proposed in this article.

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Silicon Purification by a New Type of Solar Furnace

Abstract: We propose a new method to reveal a direct transformation from solar energy to solar electricity. Instead of using electricity in the process, we use concentrated solar rays with a crucibleless process to upgrade metallurgical silicon into solar-grade silicon feedstock.

Cited by 4 publications

References 5 publications

Non‐imaging Focusing Heliostat

Non‐imaging Focusing Heliostat

Latitude-orientated mode of non-imaging focusing heliostat using spinning-elevation tracking method

A Possible Macroscopic-Photo-Catalysis Mechanism in Solar Furnace

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