A High-Flux Solar Parabolic Dish System for Continuous Thermochemical Fuel Production

Dähler, Fabian; Wild, Michael; Schäppi, Remo; Haueter, Philipp; Cooper, Thomas; Furler, Philipp; Steinfeld, Aldo

doi:10.1364/ose.2017.rm2c.6

Cited by 1 publication

(2 citation statements)

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“…Flexible structure and mechanical operation make TSD a good candidate for CST applications, especially for two step thermochemical water/CO 2 splitting [27]. Different types of TSD have been developed.…”

Section: Introductionmentioning

confidence: 99%

“…The rotating operation concept was initially proven by [27], in which a flat reflector was used as the SM In this paper, we introduce an improved concept of a TSD prototype with a rotatory hyperboloid SM and evaluate its optical performance, including optical efficiency and concentration ratio, with respect to different geometric parameters including rim angle of primary mirror (PM) and SM and inclination angle of SM. The results can guide research for designing a novel solar dish cavity receiver-reactor (CRR) system.…”

Section: Introductionmentioning

confidence: 99%

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Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO2 Splitting with the Concept of Rotary Secondary Mirror

2020

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In this paper, a novel two-stage dish concentrator (TSD) with a rotary secondary mirror (SM) is presented for solar thermal water/CO2 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 (φ1 < π/2, φ1 = π/2, φ1 > π/2, φ1=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 ≤ φ1 ≤ (π − arcsin 0.8) rads and 0.4 ≤ NA2 ≤ 0.6 (NA2 = sin φ2, φ2=field angle of SM), which vary with the concentration ratio and inclination angle.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%