From Event: SPIE Optical Engineering + Applications, 2016
Optical concentration obtained by light confinement bears unique features that can increase the efficiency of a
photochemical reactor. A suitable implementation of this method for a solar reactor is a series of parallel tubular
receivers sealed in a slab-shape reflective cavity, in which light is trapped thanks to a self-adaptive optical filtering
mechanism. To predict the concentration in such a generic configuration, we had previously established an analytical
model based on idealistic assumptions, which are not valid in our real configuration. Here, we use analytical calculations
and numerical ray-trace simulations to investigate how the finite size of the latter impacts the prediction of our model
and extrapolate design guidelines for minimal departure from ideality. We apply these guidelines to design an optical
concentrator maximizing flux density on tubular receivers and discuss the upper bound to the method, as well as the
benefits from its unique features. Accounting for practical and technological limitations, this method can provide optical
concentration in the order of ten suns in our generic configuration.
Boris Karamata and Marilyne Andersen, "Design of a light confining concentrator for a solar photochemical reactor and upper bound to the method," Proc. SPIE 9955, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIII—Commemorating the 50th Anniversary of Nonimaging Optics, 99550A (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2238313.
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