Cassigranian Solar Concentrator for ISRU Material Processing

Colozza, Anthony J.; Macosko, R. P.; Castle, Charles; Sacksteder, Kurt R.; Suzuki, Nantel; Mulherin, James

doi:10.2514/6.2012-637

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…Even with a high concentration ratio, the author did not report any thermoplastic defects for the optical concentrators, which indicates the robustness of the designed dual-axis solar tracking system, where its angular acceptance is ±0.6°. Colozza et al [87] designed a small Cassegrain system of 3000 suns to melt lunar regolith simulant. The primary and optics were made of aluminum and were coated with vacuum-deposited chrome, silver, and protective silicon dioxide (SiO).…”

Section: High Concentration Point Source Concentrators and Their Seco...mentioning

confidence: 99%

Advances and limitations of increasing solar irradiance for concentrating photovoltaics thermal system

Alzahrani

Shanks

Mallick

2021

Renewable and Sustainable Energy Reviews

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Section: High Concentration Point Source Concentrators and Their Seco...mentioning

confidence: 99%

Advances and limitations of increasing solar irradiance for concentrating photovoltaics thermal system

Alzahrani

Shanks

Mallick

2021

Renewable and Sustainable Energy Reviews

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“…Further, optical elements were integrated with this Cassegrain concentrator to increase its concentration ratio to 6,000. [25] Vu et al reported a modified optical fiber daylighting system that used a combination of a parabolic mirror and a lens to achieve a highly collimated beam of sunlight. [26] Also, homogenizers can be integrated with Cassegrain-based concentrators to improve the uniformity of the concentrated sunbeam.…”

Section: Introductionmentioning

confidence: 99%

“…[26] Also, homogenizers can be integrated with Cassegrain-based concentrators to improve the uniformity of the concentrated sunbeam. [27,28] For the HSL system proposed in this work, light could be concentrated using a Cassegrain system such as that fabricated by Colozza et al [25] and collimated using the collimator proposed by Vu et al [26] to couple a highly concentrated and collimated beam of sunlight into the entrance port of the SSS. The collimated beam of light entering the SSS will diverge as it propagates down the axis of the SSS, resulting in an increase in area of the concentrated sunlight beam, which will proportionally reduce the efficiency of the proposed HSL system (for example, using the collimator coupled to the tapered optical fiber proposed by Vu et al, [26] we estimate that the sunbeam will have a divergence of %0.15°in the SSS.…”

Section: Introductionmentioning

confidence: 99%

Selectively Harvesting Nonvisible Photons in Hybrid Solar Lighting Systems for Power Generation in Buildings

Talebzadeh

O’Brien

2022

Energy Tech

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Hybrid solar lighting (HSL) systems reduce building energy consumption by supplementing conventional indoor lighting with solar light that is channeled into the building using optic cables. Herein, it is demonstrated that HSL systems can be improved by harnessing the nonvisible portion of sunlight to generate electric power. HSL systems are integrated with parabolic‐ and elliptic‐shaped solar spectrum splitters (SSSs) that partition collimated solar radiation into its visible and nonvisible parts. In the proposed SSS, luminescent materials and a bifacial photovoltaic cell capture and convert light energy in the spectral ranges from 280 to 435 nm and 675 to 900 nm into electricity. The visible light is coupled to a waveguide to be used in indoor lighting systems. The proposed HSL system is analyzed for a 0.2 m2 projected area of solar radiation and the results show that a nonvisible‐light‐to‐electricity conversion efficiency of up to ≈13.4% can be achieved for light entering the SSS. The power generated in the system can be used to power the electrical components of the HSL system and indoor lighting during off‐sun hours.

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“…The concentrator utilized here is of a Cassegrainian design and is described in detail elsewhere (Ref. 21). The concentrator was located on a platform equipped with Suntracking hardware.…”

Section: Energy Efficiency Issuesmentioning

confidence: 99%