Dissertations / Theses on the topic 'Pv concentrator'
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Coventry, Joseph Sydney, and Joe Coventry@anu edu au. "A solar concentrating photovoltaic/thermal collector." The Australian National University. Faculty of Engineering and Information Technology, 2004. http://thesis.anu.edu.au./public/adt-ANU20041019.152046.
Full textVance, William M. "A Computational Study of a Photovoltaic Compound Parabolic Concentrator." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1429876153.
Full textMorfeldt, Johannes. "Optically Selective Surfaces in low concentrating PV/T systems." Thesis, Örebro University, School of Science and Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-7396.
Full textOne of the traditional approaches to reduce costs of solar energy is to use inexpensive reflectors to focus the light onto highly efficient solar cells. Several research projects have resulted in designs, where the excess heat is used as solar thermal energy.
Unlike a solar thermal system, which has a selective surface to reduce the radiant heat loss, a CPV/T (Concentrating PhotoVoltaic/Thermal) system uses a receiver covered with solar cells with high thermal emittance.
This project analyzes whether the heat loss from the receiver can be reduced by covering parts of the receiver surface, not already covered with solar cells, with an optically selective coating. Comparing different methods of applying such a coating and the long-term stability of low cost alternatives are also part of the objectives of this project.
To calculate the heat loss reductions of the optically selective surface coating a mathematical model was developed, which takes the thermal emittances and the solar absorptances of the different surfaces into account. Furthermore, a full-size experiment was constructed to verify the theoretical predictions.
The coating results in a heat loss reduction of approximately 20 % in such a CPV/T system and one of the companies involved in the study is already changing their design to make use of the results.
Zeitouny, Joya. "Advanced strategies for ultra-high PV efficiency." Thesis, Perpignan, 2018. http://www.theses.fr/2018PERP0056.
Full textThe maximum efficiency limit attainable with a single-junction PV cell is ~ 33% according to the detailed balance formalism (also known as Shockley-Queisser model), which remains far from the Carnot limit, predicting a solar to electricity efficiency upper value of 93%. The large gap between both limits is due to intrinsic loss mechanisms, including the inefficient conversion of the solar spectrum and the large discrepancy between the solid angles of absorption and emission. To overcome these losses and get closer to the Carnot limit, three different strategies are considered in this thesis: concentrated multi-junction solarcells, the combination of solar concentration and angular confinement, and hybrid PV/CSP systems. Each strategy is inherently limited by several loss mechanisms that degrade their performances. The objective of this thesis is, hence, to better understand the extent to which these strategies are likely to be penalized by these losses, and to tailor the cell properties toward maximizing their efficiencies. To address these questions, a detailed-balance model of PV cell accounting for the main loss mechanisms was developed. A genetic-algorithm optimization tool was also implemented, aiming at exploring the parameter space and identifying the optimal operation conditions. We demonstrate the uttermost importance of tailoring the electronic properties of the materials used with both multi-junction solar cells undergoing significant series resistance losses, and PV cells operating at temperature levels exceeding ambient temperature. We also investigate the extent to which series resistances losses and non-radiative recombination are likely to affect the ability of PV cells simultaneously submitted to concentrated sunlight and angular restriction of the light emitted by band-to-band recombination
Tefera, Misrak A. "Electricity Production from Concentrated Solar Power and PV System in Ethiopia." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40426.
Full textSharma, Pratibha. "Modeling, Optimization, and Characterization of High Concentration Photovoltaic Systems Using Multijunction Solar Cells." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35917.
Full textGaynullin, Bakhram. "LASER-TESTING RIG : Measurement System for evaluation of Shape of concentrating reflector for solar collector Absolicon X10." Thesis, Högskolan Dalarna, Energi och miljöteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:du-4645.
Full textRitou, Arnaud. "Développement, fabrication et caractérisation de modules photovoltaïques à concentration à ultra haut rendement à base de micro-concentrateurs." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY059/document.
Full textThe actual trend of CPV is the micro-scaling of modules. A bibliographic study shows that shorter focal length of optics implies less material consumption in manufacturing and an enhanced efficiency of the modules. In this thesis, a double stage refractive micro-concentrator is designed, manufactured and characterized. First, the optical design of the concentrator is based on non-imaging technics. Thus, the profile of the lenses is generated for a single wavelength. Then, a ray tracing simulator is used to optimize the lens profile for the overall solar spectrum and study the concentrator element misalignment effect on the performances.Secondly, a three steps self-assembly process is developed instead of the usual five steps one. Both POE and SOE lenses of our device are molded simultaneously and a mechanical guidance system in the mold ensures the alignment of the micro-concentrator elements (POE, SOE and Cell).Finally, the performances measurements of the manufactured modules are managed in solar simulators in which the lightening condition are previously studied and validated. Comparing the bare cells efficiency with the module efficiency, the cell-to-module ratio (CTM) represents the overall losses in the module. Further experiments are managed to quantify each loss of the module. The manufactured and characterized micro-concentrator is a 1000X concentrating ratio with 0.6 x 0.6mm² triple junction cells. It efficiency is 29% with a 70% CTM. Finally, the loss chain study reveals that the three steps self-assembly process is reliable
Albarazanchi, Abbas Kamal Hasan. "Composant diffractif numérique multispectral pour la concentration multifonctionnelle pour des dispositifs photovoltaïque de troisième génération." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD029/document.
Full textSunlight represents a good candidate for an abundant and clean source of renewable energy. This environmentally friendly energy source can be exploited to provide an answer to the increasing requirement of energy from the world. Several generations of photovoltaic cells have been successively used to convert sunlight directly into electrical energy. Third generation multijunction PV cells are characterized by the highest level of efficiency between all types of PV cells. Optical devices have been used in solar cell systems such as optical concentrators, optical splitters, and hybrid optical devices that achieve Spectrum Splitting and Beam Concentration (SSBC) simultaneously. Recently, diffractive optical elements (DOE’s) have attracted more attention for their smart use it in the design of optical devices for PV cells applications.This thesis was allocated to design a DOE that can achieve the SSBC functions for the benefit of the lateral multijunction PV cells or similar. The desired design DOE's have a subwavelength structure and operate in the far field to implement the target functions (i.e. SSBC). Therefore, some modelling tools have been developed which can be used to simulate the electromagnetic field behavior inside a specific DOE structure, in the range of subwavelength features. Furthermore, a rigorous hybrid propagator is developed that is based on both major diffraction theories (i.e. rigorous and scalar diffraction theory). The FDTD method was used to model the propagation of the electromagnetic field in the near field, i.e. inside and around a DOE, and the ASM method was used to model rigorously propagation in the free space far field.The proposed device required to implement the intended functions is based on two different DOE’s components; a G-Fresnel (i.e. Grating and Fresnel lens), and an off-axis lens. The proposed devices achieve the spectrum splitting for a Vis-NIR range of the solar spectrum into two bands. These two bands can be absorbed and converted into electrical energy by two different PV cells, which are laterally arranged. These devices are able to implement a low concentration factor of “concentrator PV cell systems”. These devices also allow achieving theoretically around 70 % of optical diffraction efficiency for the both separated bands. The impact distance is very small for the devices proposed, which allows the possibility to integrate these devices into compact solar cell systems. The experimental validation of the fabricated prototype appears to provide a good matching of the experimental performance with the theoretical model
Albaz, Abdulkarim. "Investigation into using Stand-Alone Building Integrated Photovoltaic System (SABIPV) as a fundamental solution for Saudi rural areas and studying the expected impacts." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/15844.
Full textYasrebi, Amir Bijan. "Determination of an ultimate pit limit utilising fractal modelling to optimise NPV." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/18449.
Full textPokorný, Marek. "Charakterizace vlastností fotovoltaického systému." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219073.
Full textCoventry, Joseph S. "A solar concentrating photovoltaic/thermal collector." Phd thesis, 2004. http://hdl.handle.net/1885/46253.
Full textSu, Chun-Ta, and 蘇俊達. "Using R&D Portfolio and Knowledge Flow to Explore the Investment Mode: Evidence from Emerging PV and Concentrator Photovoltaic." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/78bsv9.
Full text國立雲林科技大學
企業管理系
104
Nowadays, there is energy depletion on earth; solar cell is an important alternative energy. Emerging PV and Concentrator PV growth rapidly, the prospects of these two technologies are great, and the potential of market demand attract a lot of capital investing. Solar industry is a technology-intensive industry, so how to evaluate the technology will affect manufacturers or investors to make decision for investing or R&D in solar industry. In this study, we use Patentmeatrics to measure the R&D Portfolio and social network analysis exploring the knowledge flow to choose the great investment. There are three component of the patent portfolio; technology attractiveness、relative patent position and relative patent advantage. We can measure knowledge flow by using relative citation propensity. We can understand the whether the technology is universal or not through the ratio of cost efficiency, patent portfolio can evaluate the technology and the strength of company in the specific technical field, knowledge flow can recognize who is exporter or importer of knowledge, and then decide who are the leader and follower.
CHENG, DONG-SHENG, and 鄭東昇. "Linear Fresnel Lens For Solar Concentration PV SystemLinear Fresnel Lens For Solar Concentration PV SystemLinear Fresnel Lens For Solar Concentration PV System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65887734137579555598.
Full text明志科技大學
機電工程研究所
96
The energy resources of earth are major goods and materials to humanity, almost the develop of industry and human life is by the natural resources, but the energy resources of earth will be exhaust by the human being, under the multiple’s pressure, The solar energy was abundant application, because of that, the solar energy technology has a advance by leaps and bounds. The purpose of this thesis is to design a linear non-image Fresnel lens,use the Fresnel lens with larger incidence angles to proceed the solar concentrator to generate electric power of GaAs solar cell,in the research include the optical simulate & manufacture of arched Fresnel lens、efficiency measure of GaAs solar cell. We get a attestation in the experiment, if the illumination are ampilifide with the efficiency of solar cell augment too, but if the temperature of solar cell are raised, the efficiency of solar cell will go down. Through the combine of solar concentrator with GaAs solar cell, to heighten the efficiency of High concentration PV system and cost down.
Ye, Yi-Nan, and 葉益男. "Sun-Tracking Controller of Concentration PV System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/79316576262544238577.
Full text國立臺灣大學
機械工程學研究所
91
The main purpose of the present research is to develop a Sun-Tracking Controller of Concentration PV system which uses professional controller, two kinds of electro-optic sensors, fresnel lens and two axes tracking mechanical system for raising the efficiency of PV cell .One sensor with wide-angle sensitivity of light helps system fast to fint out where the sun is and the function of the other finely adjust system to the position of the sun. The controller follows a series of tracking control rules to judge the best way for tracking system taking energy-saving action and have a ability of anti-disturbance variation of illumination. This system using 8052 micro-processor was built and tested. On a sunny day basis, the experiment results show that the average degree of tracking accuracy is less than 4.3 ° and the energy of depletion by Stepping Motor is less 18 % of the energy produced by the tracking concentrator. The performance of the Sun-Tracking Controller of Concentration PV system is shown satisfactory.
Kao, Chen-Chiao, and 高晨喬. "Sun-Tracking Controller of Rotative Structure Concentration PV System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41879787670700975894.
Full text國立臺灣大學
機械工程學研究所
92
The main purpose of the present research is to develop a sun-tracking system of concentration through artificial intelligence (AI) to detect environment and whole system and to analyze sun history trajectory and predict future trajectory and proceed operative decisions。The system includes MPPT and that has abilities of crashproof、anti-disturbance and learning。This system using 8052 micro-processor is built and tested。On a sunny day basis,the experiment result shows that the whole power generation of Concentration PV System is three times than flat system,and the energy of depletion by two stepping motor is less 5% of energy produced by the sun-tracking concentrator。The performance of sun-tracking controller of concentration PV system is shown satisfactory。
Yu, Cheng-Da, and 余承達. "Two-Axis Sun Tracking Controller of Concentration for PV System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/pd69n5.
Full text國立高雄第一科技大學
光電工程研究所
96
In this thesis, it describes the design and fabrication of tracking sensor, and uses LED as the light sensor to cost-down. For the sensor structure , we design the large-scale angle for exterior sensor structure, and raise the tracking accuracy by interior sensor structure. In order to understand the acceptance of varied light energy to light-shift for sensors, we design the structure of sensor by FRED in order to stimulate light-shift, and fabricate the sensor as well as control the light source position by Single-Chip 8052. At last, we use light sensors structure with two-axis sun tracking system to track the sun light and the tracking accuracy can be less then 0.905 degrees.
Hyatt, Justin, Jeffrey Mrkonich, Lennon Reinhart, and Wyatt Taylor. "PVMirror – A High-Efficiency Solar Module." 2016. http://hdl.handle.net/10150/603589.
Full textTo make photovoltaics (PV) and concentrated solar thermal power (CSP) more practical forms of alternative energy, creative innovations to current solar energy methods must be employed. The PVMirror – a new technology – is our solution to that problem. The PVMirror combines PV and CSP technologies by splitting the spectrum of sunlight using a dichroic mirror film. Light that is not transmitted to the solar cell is to instead be reflected to a focus, by way of a curved mirror. This hybrid of technologies is competitive, as it is both efficient and affordable compared to many other innovations in renewable energy. The PVMirror is designed to be an easy and cost-effective replacement to the reflectors used in existing CSP plants. Ultimately, we hope to demonstrate this PVMirror technology on a large scale and market it. As validated from interviewing with industry professionals, this technology has the potential to impact the world of solar energy because many industrial companies and utility-scale CSP project developers are interested in pairing CSP and PV to increase efficiency. Currently, using an outdoor sun tracker, we are testing an 18 inch by 18 inch prototype with four solar cells.