scholarly journals Study on the Performance of Optical Lenses under High Fluxes of Solar Radiation

2021 ◽  
Vol 11 (11) ◽  
pp. 5174
Author(s):  
Luís Guerra Rosa ◽  
José Carlos Garcia Pereira ◽  
Kaveh Rahmani ◽  
Guilherme De Almeida ◽  
Luís F. Santos
Keyword(s):  
Solar Radiation ◽  
Borosilicate Glass ◽  
Silica Glass ◽  
Continuous Monitoring ◽  
Radiation Spectrum ◽  
High Concentration ◽  
Near Ultraviolet ◽  
Irradiation Test ◽  
Glass Lenses ◽  
Natural Solar Radiation

This work compares the performance of optical lenses made of silica glass or borosilicate glass (BK-7) when submitted to high-flux radiation emitted by a xenon arc lamp or provided by a high-concentration solar tower. Each irradiation test lasted for 60 min, with continuous monitoring of the radiation-flux incident on the lenses and the temperature generated in their vicinity. All silica glass lenses showed a good performance with both irradiation sources, xenon arc lamp and natural solar radiation, contrary to what was observed with the lenses made of borosilicate glass which fractured when irradiated with a xenon arc lamp. The negative behavior observed with the borosilicate lenses is attributed to the fact that the radiation spectrum of a xenon arc lamp contains certain wavelengths, in the near ultraviolet (UV) region, that are not present in the natural solar radiation spectrum at sea level.

Solar Thermophotovoltaic Converters Based on Tungsten Emitters

2006 ◽  
Vol 129 (3) ◽  
pp. 298-303 ◽  
Author(s):  
V. M. Andreev ◽  
A. S. Vlasov ◽  
V. P. Khvostikov ◽  
O. A. Khvostikova ◽  
P. Y. Gazaryan ◽  
...  
Keyword(s):  
Band Gap ◽  
High Efficiency ◽  
Radiation Spectrum ◽  
Cost Effective ◽  
Fresnel Lens ◽  
Photocurrent Density ◽  
Back Side ◽  
High Concentration ◽  
Emitter System ◽  
Solar Powered

Results of a solar thermophotovoltaic (STPV) system study are reported. Modeling of the STPV module performance and the analysis of various parameters influencing the system are presented. The ways for the STPV system efficiency to increase and their magnitude are considered such as: improvement of the emitter radiation selectivity and application of selective filters for better matching the emitter radiation spectrum and cell photoresponse; application of the cells with a back side reflector for recycling the sub-band gap photons; and development of low-band gap tandem TPV cells for better utilization of the radiation spectrum. Sunlight concentrator and STPV modules were designed, fabricated, and tested under indoor and outdoor conditions. A cost-effective sunlight concentrator with Fresnel lens was developed as a primary concentrator and a secondary quartz meniscus lens ensured the high concentration ratio of ∼4000×, which is necessary for achieving the high efficiency of the concentrator–emitter system owing to trap escaping radiation. Several types of STPV modules have been developed and tested under concentrated sunlight. Photocurrent density of 4.5A∕cm2 was registered in a photoreceiver based on 1×1cm2GaSb cells under a solar powered tungsten emitter.

Impact of phthalocyanine structure as photosensitizer for ZnO nanophotocatalyst under natural solar irradiation

2021 ◽  
pp. A-H
Author(s):  
Basma Ghazal ◽  
Saad Makhseed
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Solar Radiation ◽  
Copper Phthalocyanine ◽  
Solar Irradiation ◽  
Solar Light ◽  
Analytical Measurements ◽  
Copper Phthalocyanines ◽  
Wastewater Pollutants ◽  
Natural Solar Radiation

Novel composites of zinc oxide (ZnO) and copper phthalocyanines (CuTriPc and CuPc) were synthesized as efficient natural solar light photocatalysts for the photodegradation of organic wastewater pollutants. Spectroscopic and analytical measurements confirmed that both bulky triazolo copper phthalocyanine (CuTriPc) and unsubstituted planer (CuPc) were successfully coupled with ZnOnanoparticles. The synthesized nanocomposites were investigated as natural solar radiation photocatalysts toward the photodegradation of methylene blue (MB) analogue dye. The prepared CuTriPc/ZnO nanocomposite was proven to be an efficient solar light photocatalyst compared to pure ZnO and the unsubstituted CuPc/ZnO.

TiO2 photocatalysis under natural solar radiation for the degradation of the carbapenem antibiotics imipenem and meropenem in aqueous solutions at pilot plant scale

2019 ◽  
Vol 166 ◽  
pp. 115037 ◽  
Author(s):  
Alejandro Cabrera-Reina ◽  
Ana B. Martínez-Piernas ◽  
Yannis Bertakis ◽  
Nikolaos P. Xekoukoulotakis ◽  
Ana Agüera ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Aqueous Solutions ◽  
Pilot Plant ◽  
Tio2 Photocatalysis ◽  
Pilot Plant Scale ◽  
Natural Solar Radiation

Photodegradation of azithromycin in various aqueous systems under simulated and natural solar radiation: Kinetics and identification of photoproducts

Chemosphere ◽  
2011 ◽  
Vol 83 (3) ◽  
pp. 340-348 ◽  
Author(s):  
Lei Tong ◽  
Peter Eichhorn ◽  
Sandra Pérez ◽  
Yanxin Wang ◽  
Damià Barceló
Keyword(s):  
Solar Radiation ◽  
Aqueous Systems ◽  
Natural Solar Radiation

Devitrification inhibitors in borosilicate glass and binary borosilicate glass composite

1995 ◽  
Vol 10 (5) ◽  
pp. 1312-1320 ◽  
Author(s):  
Jau-Ho Jean ◽  
Tapan K. Gupta
Keyword(s):  
Borosilicate Glass ◽  
Silica Glass ◽  
Elevated Temperatures ◽  
Glass Composite ◽  
Binary Glass ◽  
High Silica ◽  
Glass Mixture

Cristobalite is known to precipitate out of borosilicate glass (Corning 7740) and a binary glass mixture of borosilicate glass and high silica glass when these glasses are heated to elevated temperatures. To prevent cristobalite from forming in these glass systems, a devitrification inhibitor needs to be found. Among oxides selected for testing, both Al2O3 and Ga2O3 are found to prevent cristobalite from forming in these glass systems.

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