scholarly journals High efficiency Fresnel lens design and fabrication in a two-stage photopolymer

2019 ◽  
Vol 44 (7) ◽  
pp. 1540 ◽  
Author(s):  
John E. Hergert ◽  
David J. Glugla ◽  
Amy C. Sullivan ◽  
Marvin D. Alim ◽  
Robert R. McLeod
Keyword(s):  
High Efficiency ◽  
Fresnel Lens ◽  
Lens Design ◽  
Two Stage

High-efficiency Fresnel lens design and fabrication in a two-stage photopolymer

2019 ◽  
Author(s):  
John E. Hergert ◽  
David J. Glugla ◽  
Amy C. Sullivan ◽  
Marvin D. Alim ◽  
Robert R. McLeod
Keyword(s):  
High Efficiency ◽  
Fresnel Lens ◽  
Lens Design ◽  
Two Stage

Design and Evaluation of the Fresnel-Lens Based Solar Concentrator System Through a Statistical-Algorithmic Approach

2018 ◽  
Author(s):  
Hassan Qandil ◽  
Weihuan Zhao
Keyword(s):  
High Temperature ◽  
High Efficiency ◽  
Incident Light ◽  
Thermal Analyses ◽  
Solar Spectrum ◽  
Chromatic Aberration ◽  
Fresnel Lens ◽  
Optimum Number ◽  
Solar Concentrator ◽  
Receiver System

A novel non-imaging Fresnel-lens-based solar concentrator-receiver system has been investigated to achieve high-efficiency photon and heat outputs with minimized effect of chromatic aberrations. Two types of non-imaging Fresnel lenses, a spot-flat lens and a dome-shaped lens, are designed through a statistical algorithm incorporated in MATLAB. The algorithm optimizes the lens design via a statistical ray-tracing methodology of the incident light, considering the chromatic aberration of solar spectrum, the lens-receiver spacing and aperture sizes, and the optimum number of prism grooves. An equal-groove-width of the Poly-methyl-methacrylate (PMMA) prisms is adopted in the model. The main target is to maximize ray intensity on the receiver’s aperture, and therefore, achieve the highest possible heat flux and output concentration temperature. The algorithm outputs prism and system geometries of the Fresnel-lens concentrator. The lenses coupled with solar receivers are simulated by COMSOL Multiphysics. It combines both optical and thermal analyses for the lens and receiver to study the optimum lens structure for high solar flux output. The optimized solar concentrator-receiver system can be applied to various devices which require high temperature inputs, such as concentrated photovoltaics (CPV), high-temperature stirling engine, etc.

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.

High-efficiency CuInSe2 solar cells prepared by the two-stage process

Solar Cells ◽  
1989 ◽  
Vol 27 (1-4) ◽  
pp. 299-306 ◽  
Author(s):  
Bulent M. Basol ◽  
Vijay K. Kapur ◽  
Richard C. Kullberg
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Two Stage ◽  
Stage Process

scholarly journals Development of high efficiency 4 K two-stage pulse tube cryocoolers with split valve unit

2012 ◽  
Author(s):  
Kyosuke Nakano ◽  
Mingyao Xu ◽  
Hirokazu Takayama ◽  
Akihiro Tsuchiya ◽  
Motokazu Saito
Keyword(s):  
High Efficiency ◽  
Pulse Tube ◽  
Two Stage ◽  
Valve Unit

scholarly journals Two-stage particle separation channel based on standing wave surface acoustic wave

2021 ◽  
Author(s):  
Xueye Chen ◽  
Yaolong Zhang
Keyword(s):  
Sound Pressure ◽  
High Efficiency ◽  
Microfluidic Channel ◽  
Particle Separation ◽  
Disease Diagnosis ◽  
Nano Particles ◽  
Two Stage ◽  
Separation Channel ◽  
Practical Applications ◽  
Electrode Voltage

Abstract Microfluidic technology has great advantages in the precise manipulation of micro and nano particles, and the collection method of micro and nano particles based on ultrasonic standing waves has attracted much attention for its high efficiency and simplicity of structure. This paper proposes a two-stage particle separation channel using ultrasound. In the microfluidic channel, two different sound pressure regions are used to achieve the separation of particles with positive acoustic contrast factors. Through numerical simulation, the performance of three common piezoelectric substrate materials was compared qualitatively and quantitatively, and it was found that the output sound pressure intensity of 128°YX-LiNbO3 was high and the output was stable. At the same time, the influence of the number of electrode pairs of the interdigital transducer and the electrode voltage on the output sound wave is studied. Finally, 15 pairs of electrode pairs are selected, and the electrode voltages of the two sound pressure regions are 2.0V and 3.0V respectively. After selecting the corresponding parameters, the separation process was numerically simulated, and the separation of three kinds of particles was successfully achieved. This work has laid a certain theoretical foundation for rapid disease diagnosis and real-time monitoring of the environment in practical applications.

A Novel Square Fresnel Lens Design for Illuminating Circular Solar Cells

1978 ◽  
Vol 17 (3) ◽  
Author(s):  
E. L. Burgess ◽  
D. L. Marchi ◽  
Helmut Walter
Keyword(s):  
Solar Cells ◽  
Fresnel Lens ◽  
Lens Design

High-efficiency treatment of benzaldehyde residue using two-stage fluidized-bed/fixed-bed catalytic system

2019 ◽  
Vol 41 (22) ◽  
pp. 2898-2906 ◽  
Author(s):  
Qing Liu ◽  
Rongjie Chen ◽  
Maorong Zeng ◽  
Zhaoyang Fei ◽  
Xian Chen ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Catalytic System ◽  
High Efficiency ◽  
Fixed Bed ◽  
Two Stage
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