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초록· 키워드

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The objective of this study is to develop various non-imaging Fresnel lenses of optical concentration ratio of 300X for a solar concentration photovoltaic system with a triple-junction cell. The non-imaging Fresnel lens has an advantage of concentrating solar incidence within a certain acceptance half angle onto the absorber: The optical system is robust against errors of tracking or alignment. The authors designed various lenses with the styles of flat, shallow dome and deep dome and examined their performances by ray tracing. Although the ideal lens consisting of undercut prisms gives the highest optical efficiency, it is difficult to manufacture it by injection molding. Finally it was found that the deep dome lens where center part has no undercut prism yields almost the same high optical efficiency and that there is a possible manufacturing process. Daido Metal company produced the lens, which was installed in a solar concentration photovoltaic module for power generation. Modules of this type in 2003 set the world record for photovoltaic module efficiency at 28%.

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Abstract

1. Introduction

2. Principle of Non-imaging Fresnel lens

3. Lens design and optical efficiency

4. Idea of Dual lens and its performance

5. Conclusion

Acknowledgement

References

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UCI(KEPA) : I410-ECN-0101-2009-563-018203359