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Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO 2 Splitting with the Concept of Rotary Secondary Mirror

Author

Listed:
  • Song Yang

    (Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China)

  • Jun Wang

    (Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China)

  • Peter D. Lund

    (Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China
    School of Science, Aalto University, P.O. Box 15100, FI-00076 Aalto (Espoo), Finland)

Abstract

In this paper, a novel two-stage dish concentrator (TSD) with a rotary secondary mirror (SM) is presented for solar thermal water/CO 2 splitting. An in-house code for ray-tracing simulation of the concentrator was developed and validated. Among all feasible geometries, a hyperboloid with an upper sheet is the most popular option and is widely used as a secondary reflector, which is mainly discussed here. All para-hyperboloid geometric combinations can be categorized into three typical patterns ( φ 1 < π/2, φ 1 = π/2, φ 1 > π/2, φ 1 = field angle of PM). The initial designs of the TSD, respective to different off-axis levels for each combination, were first designed. Then a new mathematical model was introduced to reshape the SM to reach optimal truncated designs. Finally, a new concept of an off-axis primary mirror (PM) combined with the truncated SM was evaluated by using the in-house ray-tracing code. The results include the optical efficiency, concentration ratio and intercepted radiant flux. The best solutions with the highest optical efficiency fall in the range π/2 ≤ φ 1 ≤ (π − arcsin 0.8) rads and 0.4 ≤ NA 2 ≤ 0.6 ( NA 2 = sin φ 2 , φ 2 = field angle of SM), which vary with the concentration ratio and inclination angle.

Suggested Citation

  • Song Yang & Jun Wang & Peter D. Lund, 2020. "Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO 2 Splitting with the Concept of Rotary Secondary Mirror," Energies, MDPI, vol. 13(14), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3553-:d:382738
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    References listed on IDEAS

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    1. Wang, Jun & Yang, Song & Jiang, Chuan & Yan, Qianwen & Lund, Peter D., 2017. "A novel 2-stage dish concentrator with improved optical performance for concentrating solar power plants," Renewable Energy, Elsevier, vol. 108(C), pages 92-97.
    2. Yang, Song & Wang, Jun & Lund, Peter D. & Jiang, Chuan & Liu, Deli, 2018. "Assessing the impact of optical errors in a novel 2-stage dish concentrator using Monte-Carlo ray-tracing simulation," Renewable Energy, Elsevier, vol. 123(C), pages 603-615.
    3. Christopher L. Muhich & Brian D. Ehrhart & Ibraheam Al-Shankiti & Barbara J. Ward & Charles B. Musgrave & Alan W. Weimer, 2016. "A review and perspective of efficient hydrogen generation via solar thermal water splitting," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 5(3), pages 261-287, May.
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