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A simple method to achieve a uniform flux distribution in a multi-faceted point focus concentrator

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  • Perez-Enciso, Ricardo
  • Gallo, Alessandro
  • Riveros-Rosas, David
  • Fuentealba-Vidal, Edward
  • Perez-Rábago, Carlos

Abstract

A method to achieve a uniform flux distribution with a multi-faceted point focus concentrator for laboratory tests is proposed in this work. The method can be applied to different types of receiver - thermal or photovoltaic - and no additional device is required to homogenize the flux. The technique consists in moving the receiver from the focal plane and enlarging the solar spot impinging on it. At the same time, each mirror aim-point is adjusted in order to superimpose the images that have been generated by every facet. To evaluate the method, a real multi-faceted concentrator composed of eighteen spherical mirrors was modeled in a ray-tracing software. The procedure was validated through the comparison of an image of the real solar spot on the receiver generated by three mirrors, and the simulated flux obtained the same way. This way a mean concentrator global optical error of 2.8 mrad was estimated. This value was used then for further analyses. Results show that the concentration factor can be varied in a range of 150–900 suns over a receiver diameter of up to 7 cm. Hence, according to the receiver requirements, it is possible to expand the distribution and to alter the intensity of the flux. Finally, optical parametrical analyses were carried out, from which it is inferred that good quality optics give rise to a more homogeneous solar flux on the receiver.

Suggested Citation

  • Perez-Enciso, Ricardo & Gallo, Alessandro & Riveros-Rosas, David & Fuentealba-Vidal, Edward & Perez-Rábago, Carlos, 2016. "A simple method to achieve a uniform flux distribution in a multi-faceted point focus concentrator," Renewable Energy, Elsevier, vol. 93(C), pages 115-124.
    • Handle: RePEc:eee:renene:v:93:y:2016:i:c:p:115-124
    DOI: 10.1016/j.renene.2016.02.069
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    References listed on IDEAS

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    4. Moreno-Álvarez, Lúar & Amat-Castrillón, Andrés, 2019. "Comments to “A simple method to achieve a uniform flux distribution in a multi-faceted point focus concentrator”," Renewable Energy, Elsevier, vol. 133(C), pages 1479-1483.
    5. Yuan, Yu & Wu, Gang & Yang, Qichang & Cheng, Ruifeng & Tong, Yuxin & Zhang, Yi & Fang, Hui & Ma, Qianlei, 2021. "Experimental and analytical optical-thermal performance of evacuated cylindrical tube receiver for solar dish collector," Energy, Elsevier, vol. 234(C).
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    7. Duc Tu Vu & Ngoc Minh Kieu & Tran Quoc Tien & Thanh Phuong Nguyen & Hoang Vu & Seoyong Shin & Ngoc Hai Vu, 2022. "Solar Concentrator Bio-Inspired by the Superposition Compound Eye for High-Concentration Photovoltaic System up to Thousands Fold Factor," Energies, MDPI, vol. 15(9), pages 1-24, May.
    8. Yan, Jian & Peng, You-duo & Cheng, Zi-ran, 2018. "Optimization of a discrete dish concentrator for uniform flux distribution on the cavity receiver of solar concentrator system," Renewable Energy, Elsevier, vol. 129(PA), pages 431-445.
    9. Wang, Cheng-Long & Gong, Jing-Hu & Yan, Jia-Jie & Zhou, Yuan & Fan, Duo-Wang, 2019. "Theoretical and experimental study on the uniformity of reflective high concentration photovoltaic system with light funnel," Renewable Energy, Elsevier, vol. 133(C), pages 893-900.
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