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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-07
Major/Subject
Mcode
Degree programme
Language
en
Pages
14
Series
Energies, Volume 13, issue 14
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 (phi(1)<pi/2,phi(1)= pi/2,phi(1)> pi/2,phi(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 pi/2
Description
Keywords
solar thermal, dish concentrator, ray-tracing method, thermochemical redox, SOLAR HYDROGEN-PRODUCTION, CYCLE, CO2, EXCHANGE, SYSTEM, H2O, H-2
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Citation
Yang , S , Wang , J & Lund , P D 2020 , ' Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO(2)Splitting with the Concept of Rotary Secondary Mirror ' , Energies , vol. 13 , no. 14 , 3553 . https://doi.org/10.3390/en13143553