Fresnel Lens Soiling Characterization and Effect Upon Performance

2009 ◽  
Author(s):  
Leonardo D. Banchik ◽  
Aaron Sahm ◽  
Robert Boehm ◽  
Kenneth W. Stone
Keyword(s):  
Power Production ◽  
Fresnel Lens ◽  
Measurement Procedure ◽  
Power Performance ◽  
High Concentration ◽  
Pv System ◽  
Direct Function ◽  
Fresnel Lenses ◽  
The University

The Amonix system is a high concentration PV system that utilizes acrylic Fresnel lenses to focus the sun’s rays onto dispersed PV cells. The Fresnel lenses become soiled with dust over time which decreases power performance. Because of the effect soiling has upon the system performance, Amonix and the University of Nevada, Las Vegas (UNLV) have defined a long term soiling investigation and cleaning methodology. The test and measurement procedure for determining Fresnel lens soiling rate characterization is discussed. Lens soiling rate data is presented for different sites that show the soiling rate is a direct function of the angle of the lens. This paper also discusses the test and measurement procedure of the first phase of an on-going Fresnel lens cleaning investigation. An assessment of the soiling rate upon power production is also presented.

A Novel High Concentration Fresnel Lens as a Solar Concentrator

2021 ◽  
pp. 1-29
Author(s):  
Kuldeep Awasthi ◽  
Desireddy Shashidhar Reddy ◽  
Mohd. Kaleem Khan
Keyword(s):  
Optical Axis ◽  
Spherical Aberration ◽  
Spherical Surface ◽  
Fresnel Lens ◽  
High Concentration ◽  
Aperture Diameter ◽  
Convex Lens ◽  
Flat Base ◽  
Fresnel Lenses ◽  
Outer Vertex

Abstract This paper describes the design methodology for a novel Fresnel lens. The original Fresnel lens is obtained from a plano-convex lens, whose spherical surface is split into a number of divisions (called facets), collapsed onto the flat base. Thus, all the facets of the original Fresnel lens have the same radius as that of the plano-convex lens. The proposed design aims to achieve better ray concentration and reduced spherical aberration than the original Fresnel lens by constructing spherical facets with unequal radii. The centers and radii of facets are constrained so that the ray refracted from the bottom vertex of each facet on one side of the optical axis and the ray refracted from the outer vertex of the corresponding facet on the other side of the optical axis must intersect at the focal plane. The proposed lens design has resulted in a 275% gain in the concentration ratio and a 72.5% reduction in the spherical aberration compared to the original lens of the same aperture diameter and number of facets. The performance of both novel and original Fresnel lenses when used as solar concentrators with a conical coil receiver is evaluated. The novel Fresnel lens led to increased heat gain and resulted in a compact solar collector design.

Cleanliness Maintenance for an Amonix Lens System

Solar Energy ◽  
2005 ◽  
Author(s):  
Aaron Sahm ◽  
Allison Gray ◽  
Robert Boehm ◽  
Ken Stone
Keyword(s):  
Lens System ◽  
Time Data ◽  
High Concentration ◽  
Pv System ◽  
Cleaning Agent ◽  
Fresnel Lenses ◽  
Fixed Orientation ◽  
The Impact

The Amonix system is a high concentration PV system that utilizes Fresnel lenses to focus the sun’s rays on PV cells. This paper deals with issues related to the cleanliness of the lenses, the impact on performance, and the methods that can be used to clean the lenses. Issues addressed in the paper include the estimation of air-borne dirt accumulation with time. Data found in the course of our study were compared to data given in the literature about loss of transmissivity with acrylic soiling. These data were then modified to account for the two-axis tracking used for the Amonix unit, compared to the fixed orientation of the test. The effects of the loss of transmissivity were used to estimate decreases of the power produced. Costs of cleaning were compared to the lost revenue due to the decrease in sunlight reaching the cell. It is shown that rain is a good cleaning agent for the lenses. Barring precipitation, though, cleaning once a month is recommended.

CPV Modules Based on Lens Panels

2010 ◽  
Vol 74 ◽  
pp. 211-218 ◽  
Author(s):  
V.D. Rumyantsev ◽  
Yu.V. Ashcheulov ◽  
N.Yu. Davidyuk ◽  
E.A. Ionova ◽  
P.V. Pokrovskiy ◽  
...  
Keyword(s):  
Solar Cells ◽  
Heat Dissipation ◽  
Fresnel Lens ◽  
Test Method ◽  
Glass Sheet ◽  
Ir Absorption ◽  
Back Side ◽  
High Concentration ◽  
Small Aperture ◽  
Fresnel Lenses

A work on development of the high concentration photovoltaic (HCPV) modules with Fresnel lens panels and III-V multijunction cells is presented. A composite structure of the small-aperture area 40x40 (or 60x60) mm2 Fresnel lenses, united in a panel, was realized. A silicate glass sheet (front side of a module) serves as a superstrate for transparent microprisms formed in silicone. Small averaged thickness of the prisms ensures low IR absorption of sunlight in comparison with acrylic Fresnel lenses. Temperature dependences of the optical properties in such a type of the solar concentrators and PV properties of the cells in passive heat dissipation conditions are under consideration. The solar cells are the triple-junction InGaP/(In)GaAs/Ge cells with designated illumination area 1.7-2.3 mm in diameter. A HCPV module consists of the 144 (or 64) sub-modules in 12x12 (or 8x8) configuration. Solar cells are protected from environment in different ways: by side walls of a module body, or by a rear glass sheet at integrated sealing the cells in a back-side module panel. Module design includes refractive smooth-surface secondary lenses. The cell strings are glued to the rear glass surface of the module body using lamination process. Proper quality of the solar cells in a multistage module assembling procedure is ensured owing to specially developed contactless test method, based on analyzing the electroluminescent signals at local photoexitation. For arrangement of the HCPV modules in a solar installation, a number of the solar trackers have been developed and realized for 1-3-5 kWp of the installed power.

scholarly journals Researches on the development of an optical system for improving the efficiency of photovoltaic panels

2020 ◽  
Vol 180 ◽  
pp. 02008
Author(s):  
Dana Rizescu ◽  
Ciprian Ion Rizescu ◽  
Cristian Gabriel Alionte
Keyword(s):  
Fresnel Lens ◽  
Lens Model ◽  
Focal Points ◽  
Matlab Simulation ◽  
Focal Distance ◽  
Manufacturing Costs ◽  
Photovoltaic Panel ◽  
Planar Convex ◽  
Fresnel Lenses

The paper aims to create a unit using Fresnel lenses. This module consist of an arrangement of planar-convex Fresnel lenses, made of methyl polymethacrylate, mounted in a hexagonal raster and bent to form a dome for collecting and amplifying solar radiation at several focal points and with the possibility of adjusting the focal distance. The module has three aluminum alloy legs that are vertically adjustable. This construction using Fresnel lenses mounted in a hexagonal raster will increase the energy collected by a photovoltaic panel, thus significantly reducing energy losses and long-term costs. Compared to normal lenses, these lenses are considerably lighter because the material in the center of the lens is reduced, and for manufacturing can be used methyl polymethacrylate or polycarbonate, thus greatly reducing manufacturing costs. To show the functioning of the unit the authors presents in the paper a MATLAB simulation of the Fresnel lens model and a ray propagation.

scholarly journals Enhanced power performance of an in situ sediment microbial fuel cell with steel-slag as the redox catalyst: I. electricity generation

2020 ◽  
Vol 4 (3) ◽  
pp. 1363-1371
Author(s):  
Kyeongmin Kim ◽  
Shinya Nakashita ◽  
Tadashi Hibino
Keyword(s):  
Microbial Fuel Cells ◽  
Electricity Generation ◽  
Steel Slag ◽  
Power Production ◽  
External Factors ◽  
Power Performance ◽  
Factors Affecting ◽  
Redox Catalyst

Steel-slag was added as a catalyst to sediment microbial fuel cells (SMFCs) in an in situ sediment biodegradation experiment to determine the benefits to long-term power production of the cells and to elucidate the external factors affecting power production.

Optical Design and Manufacturing of Fresnel Lenses for The First Korean High Concentration Solar PV System

2011 ◽  
Author(s):  
Kwangsun Ryu ◽  
Goo-Hwan Shin ◽  
Wonho Cha ◽  
Seongwon Kang ◽  
Youngsik Kim ◽  
...  
Keyword(s):  
Optical Design ◽  
Solar Pv ◽  
High Concentration ◽  
Pv System ◽  
Design And Manufacturing ◽  
Solar Pv System ◽  
Fresnel Lenses

From Volunteering to Academic Programming: A Case Example

2016 ◽  
Vol 1 (17) ◽  
pp. 7-11 ◽  
Author(s):  
Cindy Gill ◽  
Sneha Bharadwaj ◽  
Nancy Quick ◽  
Sarah Wainscott ◽  
Paula Chance
Keyword(s):  
Special Needs ◽  
Cultural Relevance ◽  
Master's Program ◽  
Speech Language Pathology ◽  
Community Based ◽  
Charitable Organization ◽  
Language Pathology ◽  
The University

A speech-language pathology master's program that grew out of a partnership between the University of Zambia and a U.S.-based charitable organization, Connective Link Among Special needs Programs (CLASP) International, has just been completed in Zambia. The review of this program is outlined according to the suggested principles for community-based partnerships, a framework which may help evaluate cultural relevance and sustainability in long-term volunteer efforts (Israel, Schulz, Parker, & Becker, 1998).

Integration of Digital Preservation Knowledge, Skills and Competencies in the Teaching Curricula of Library and Information Studies at the University of Botswana

Mousaion ◽  
2019 ◽  
Vol 37 (1) ◽  
Author(s):  
Thatayaone Segaetsho ◽  
Julie Moloi
Keyword(s):  
Digital Preservation ◽  
Records Management ◽  
Structured Interviews ◽  
University Of Botswana ◽  
Current Trends ◽  
Teaching Content ◽  
Library And Information Studies ◽  
Information Studies ◽  
The University

In the past few decades, digital technology has found a place in the acquisition, arrangement, description, preservation, and dissemination of information. However, heritage institutions are perturbed by the challenges of digital preservation strategies particularly for education. Despite continuous investment in digital preservation, there are limited skilled professionals to equip learners with the knowledge, skills and competencies required to drive digital preservation in Botswana. Therefore, this paper investigated the knowledge, skills and competencies related to digital preservation in the teaching curricula of the Department of Library and Information Studies (DLIS) at the University of Botswana. Data collection was done through intensive structured interviews with specific educators who teach courses on digital preservation in the archives and records management stream. The study revealed that despite the fact that the educators in preservation courses are aware of current trends in digital preservation, most of them have not obtained formal degree certification specific to digital preservation. The findings further revealed that minimal digital preservation competencies are observed in the teaching curricula. A significant number of challenges observed illustrated mainly a lack of resources and limited skills in terms of practical demonstrations by educators. The curricula mostly lacked clarity on long-term and short-term digital preservation. The study recommends that DLIS and other institutions should conduct surveys or curriculum auditing on digital preservation in order to improve the teaching content. A significant number of shortcomings regarding digital preservation that could motivate further studies are also discussed under the conclusion and recommendations section of this study.

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