Дисертації з теми "Solar Mirrors"
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Gomez, Teresa M. "Binary actuation of solar mirrors." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68528.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 42).
This thesis explores the use of binary actuators to adjust the shape of an array of mirrors. To explore this concept, an experimental system was refurbished and recalibrated. This experimental system was used to explore the range of possible configurations that could be reached by a simple binary actuated system. System models are required for accurate control of these binary actuated structures. This thesis develops and tests the accuracy of two different modeling approaches, linear and iterative. The linear model assumes that each actuator contributes a constant value to the angle of the center mirror, and that this value is not dependent on the other actuator positions. The actuator contributions are summed to find the angle of the center mirror. These contributions are found two ways: by taking a relevant single data point for each actuator, and by using a least squares fitting of a large subset of data. The iterative model assumes that each actuator adds some constant value, similar to the previous model, and that it also adds some portion of the current angle. A multiplication and shift are therefore found for each actuator, and these multiplications and shifts successively applied, starting with the initial angles, to find the final angular position. While the linear model with measured values for the actuator contributions predicted the data poorly, the linear model with the least squares fitted values performed much better. The iterative model initially produced large errors, but these errors were found to be readily correctable and once removed, the iterative model predicted the data better than the linear model.
by Teresa M. Gomez.
S.B.
Contino, Alessandro Patrizio. "Solar mirrors characterization for concentrating solar power technology." Doctoral thesis, Università di Catania, 2012. http://hdl.handle.net/10761/993.
Повний текст джерелаForhan, Elizabeth Michelle. "Production of Paraboloidal Silver-Coated Mirrors from Float Glass for Solar Application." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/320099.
Повний текст джерелаIslam, Md Safatul. "Production of Paraboloidal Silver-Coated Mirrors from Float Glass for Solar Application." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/320141.
Повний текст джерелаMessina, Cassandra Aileen. "Production of Paraboloidal Silver-Coated Mirrors from Float Glass for Solar Application." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/321897.
Повний текст джерелаZavada, Thomas Joseph. "Production of Paraboloidal Silver-Coated Mirrors from Float Glass for Solar Application." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/322098.
Повний текст джерелаLampkowski, Marcelo [UNESP]. "Dispositivo automatizado para a limpeza da superfície refletora de heliostato em sistemas de energia solar concentrada – CSP." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151055.
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A possibilidade de redução na oferta de combustíveis convencionais aliada ao crescimento da demanda por energia e a crescente preocupação com o meio ambiente impulsionam a pesquisa e desenvolvimento de fontes alternativas de energia menos poluentes, renováveis e que produzam menor impacto ambiental. Dentre estas alternativas, destaca-se a energia solar, fonte disponível e passível de ser explorada a partir de todas as suas potencialidades. Atualmente, uma das vias tecnológicas de aproveitamento da fonte solar para geração de energia é a heliotermia, também conhecida como energia solar concentrada ou Concentrated Solar Power (CSP), baseada na utilização de superfícies espelhadas que refletem e concentram a radiação solar direta com o objetivo de convertê-la em energia térmica, a partir da qual se gera vapor d’água que irá acionar um ciclo termodinâmico reversível que converte calor em trabalho, conhecido como Rankine. O soiling consiste no depósito de diferentes tipos de sujeiras em uma superfície exposta em um dado ambiente. No caso de usinas CSP de torre central, o acúmulo gradativo de poeira, sujeira ou até mesmo de excremento de pássaros nas superfícies refletoras dos heliostatos causa uma redução significativa na quantidade de radiação solar que atinge o receptor posicionado no alto da torre e diminuição da eficiência de todo o sistema. Assim, faz-se necessário manter um alto fator de refletividade nas superfícies espelhadas dos heliostatos por meio de uma limpeza regular. Este trabalho apresenta a proposta de um mecanismo automatizado para efetuar a limpeza de superfícies refletoras de heliostatos. O desenvolvimento deste dispositivo, desde sua concepção, passando pelas fases de construção, instalação e funcionamento, respeita padrões de eficiência da limpeza, visa o baixo custo de produção, facilidade de instalação e minimização dos impactos ambientais pertinentes, como, por exemplo, baixo consumo de água na operação. Por meio de experimentos realizados em situações reais de aplicação, utilizando para tal um heliostato de 8 m2 localizado no Departamento de Engenharia Rural da Faculdade de Ciências Agronômicas da UNESP, campus de Botucatu, constatou-se que o dispositivo proposto é uma opção operacionalmente e economicamente viável de solução ao soiling quando aplicado na região de Botucatu, principalmente se comparado a outras propostas de métodos de limpeza de heliostatos apresentadas nos cenários internacional e nacional. Além disso, por meio de estudos sobre os impactos ambientais de usinas heliotérmicas, foi possível sugerir melhorias no processo de licenciamento ambiental de usinas CSP no Brasil.
The possibility of reduction in the supply of conventional fuels, the continuous growing demand for energy and the current concern with the environmental scenario influence the development of researches regarding alternative, renewable and less polluting energy sources, which produces less environmental impact. Among these alternatives, it is worth mentioning the solar energy, available source and that can be explored from all its potentialities. Nowadays, one of many the technological process that uses solar energy for electricity generation is the solar thermal one, also known as Concentrated Solar Power (CSP), based on the use of mirrored surfaces that reflect and concentrate the direct sunlight in order to convert it into thermal energy, from which it generates water vapor that will initiate a reversible thermodynamic cycle which converts heat into energy (Rankine cicle). The phenomenon known as soiling consists in the depositing of different types of dirt on a surface exposed in a given environment. In the case of power tower CSP plants, the gradual accumulation of dust, dirt or even bird's excrements on the reflective surfaces of heliostats causes a significant reduction in the amount of solar radiation that reaches the receiver located at the top of the tower and decreases the efficiency of the entire system. Thus, it is necessary to maintain a high reflectivity factor in the mirrored surfaces of the heliostats through a regular cleaning. This work presents a proposal of an automated mechanism to clean up the reflective surfaces of heliostats. The development of this device, from its conception, through the stages of construction, installation and operation, regarding the cleaning efficiency standards, aimed at low production cost, ease of installation and minimizing the relevant environmental impacts, such as, low consumption of water during its operation. Through experiments in real situations, using a 8 m2 heliostat located in the Department of Rural Engineering of UNESP's Faculty of Agronomic Sciences, Botucatu campus, it was verified that the proposed device is an operationally and economically option for the solution to soiling when applied at Botucatu's region, especially if compared to other proposed methods of heliostats cleaning presented in the international and national scenarios. In addition, through studies on the environmental impacts of heliothermic plants, it was possible to suggest improvements in the environmental licensing process of CSP plants in Brazil.
Nardello, Marco. "Optical subsystems of metis (multi element telescope for imaging and spectroscopy) on board of the solar orbiter mission." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3426761.
Повний текст джерелаLa linea spettrale Lyman-, a 121.6 nm, è una lunghezza d'onda di grande interesse per l'esplorazione dell'ambiente solare e per l'astrosica. È un'importante linea di emissione dell'idrogeno e può dare informazioni sulle dinamiche di regioni calde dello spazio come la fotosfera solare e la corona. Lo strumento METIS (Multi Element Telescope for Imaging and Spectroscopy) sarà a bordo della missione Solar Orbiter, una missione dell'ESA in collaborazione con la NASA che dal 2018 intraprenderà un viaggio verso il Sole per esplorare le dinamiche della dinamo solare e la sua connessione con la corona e l'eliosfera. METIS acquisirà immagini nel visibile e alla lunghezza d'onda Lyman-, studiando la forma e l'evoluzione dei processi in espansione dal Sole verso l'eliosfera. Nei laboratori del CNR-IFN UOS Padova ho utilizato facility di deposizione e caratterizzazione per studiare le caratteristiche di materiali e dispositivi utilizzabili come elementi ottici per la lunghezza d'onda Lyman-. Grazie ad un microscopio a forza atomica (AFM) è stata realizzata una caratterizzazione di tipo morfologico mentre una caratterizzazione ottica ha rivelato le performance di materiali e dispositivi. Le variazioni di tali performance sono state ricondotte a modiche delle condizioni sperimentali e le conoscenze acquisite sono state utilizzate per ottimizzare le performance del prodotto nito. L'annealing è un aproccio che non è mai stato completamente esplorato e che può aumentare le qualità ottiche dei lm sottili di uoruro di magnesio, e di conseguenza aumentare la riettività degli elementi ottici per il range VUV. Io ho condotto uno studio dei fenomeni coinvolti nel processo e applicato la procedura alla realizzazione di migliori specchi per questa regione spettrale. In questo lavoro sono presentati tutti i passaggi sperimentali che hanno condotto alla realizzazione dei dispositivi ultimati e sono descritte le caratteristiche del nuovo approccio dell'annealing.
Kmeť, Jozef. "Problematika snižování tepelné odrazivosti zrcadel solární elektrárny se Stirlingovým motorem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231827.
Повний текст джерелаAvenel, Coralie. "Durabilité des miroirs pour l'énergie solaire à concentration : étude des modes de vieillissement." Thesis, Université Clermont Auvergne (2017-2020), 2018. http://www.theses.fr/2018CLFAC035/document.
Повний текст джерелаDurability of solar mirrors is a key point for the development of concentrating solar power plants, because of the large investment, the goal of 30 years lifetime and of the implantations areas with hostile climates. This research work concerns the study of degradation modes and of monolithic or laminated glass solar mirrors durability. This thesis allows to successfully apply to CSP a lifetime prediction method already developed in more mature fields. Correlations between accelerated ageing tests and natural outdoor exposures performed on three sites evidence the predominant role of water and irradiance in protection paints of monolithic mirrors degradation. Damp heat tests were evaluated too aggressive for mirrors, considering thus the climatic conditions of potential application sites. Experimental results of accelerated ageing tests lead to the determination of kinetic parameters included in mathematical relationships modelling the main stress factors previously identified. Acceleration factors were then calculated for standard tests compared to sites with operational CSP plants. This work finally allows to estimate lifetimes of mirrors on specific sites, assuming that only the studied stress factors take part in degradation
Zhan, Yong. "Analysis of tracking error effects for the Fresnel mirror solar concentrator." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/560271.
Повний текст джерелаDepartment of Physics and Astronomy
Sesuraj, Rufina. "Plasmonic mirror for light-trapping in thin film solar cells." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/366663/.
Повний текст джерелаYing, Xiaomin. "Statistical ray-tracing analysis of the linear Fresnel mirror solar concentrator." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/897508.
Повний текст джерелаDepartment of Physics and Astronomy
Figgures, Christopher Colin. "The sputtering of zinc oxide thin films for spectrally selective solar energy material applications." Thesis, Oxford Brookes University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329488.
Повний текст джерелаKing, Peter. "Form measurement and durability of mirror surfaces for concentrating solar power applications." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9582.
Повний текст джерелаWoodrow, Oliver Rhys. "Characterisation of a parabolic trough collector using sheet metal and glass mirror strips." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62804.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2017.
Chemical Engineering
MEng
Unrestricted
Oh, Chang Jin, Andrew E. Lowman, Greg A. Smith, Peng Su, Run Huang, Tianquan Su, Daewook Kim, Chunyu Zhao, Ping Zhou, and James H. Burge. "Fabrication and testing of 4.2m off-axis aspheric primary mirror of Daniel K. Inouye Solar Telescope." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622428.
Повний текст джерелаAnglani, Francesco. "Computer modelling and experimental testing of spray cleaning methodologies for concentrated solar thermal (CST) mirror cleaning." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116180/1/Francesco_Anglani_Thesis.pdf.
Повний текст джерелаСамійленко, В. В. "Дослідження властивостей сонячних модулів". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/22980.
Повний текст джерелаМетою є встановлення умов для збільшення коефіцієнта перетворення фотоелектричних елементів Установка для проведення експериментального дослідження включала в себе універсальний проєкційний апарат з оптичною лавою ФОС-115, обладнаний лампою розжарення 500 Вт, лінза Френеля (27,5×27,5 см), люксметр DT-856A, сонячний модуль АК8045, мультиметр UT33C, увігнуте дзеркало, резистор ОМЛТ-1. У процесі досліджень за допомогою пристрою дослідження сонячних модулів встановлювали залежність потужності, яка виділяється на сонячному модулі, від освітленості природніх та штучних джерел світла. Проводили вимірювання з увігнутим дзеркалом та і лінзою в приміщенні: при кімнатній освітленості та із включеною лампою розжарення; на вулиці: при прямому попаданні сонячних променів на модуль, із дзеркалом та з лінзою, які були розташовані таким чиним, щоб зібране світло попадало одночасно на фотодетектор люксметра та на сонячний модуль АК8045. Загалом було проведено 9 серій експериментів. За отриманими даними побудували графік залежності потужності, яка виділяється на споживачі, від освітленості Сонця. Розібрали будову та принцип дії сонячних модулів, їх різновиди та властивості. Зробили висновки за результатами досліджень.
Object - photovoltaic cells The goal is to establish conditions for increasing the conversion factor of photovoltaic cells The installation for the experimental testing included a universal projection device with optical bench FOS-115, equipped with an incandescent lamp 500 W, Fresnel lens (27.5×27.5 cm), luxmeter DT-856A, solar module AK8045, multimeter UT33C, concave mirror, resistor OMLT-1. In the course of research, the dependence of the power released on the solar module on the illumination of natural and artificial light sources was established with the help of a device for studying solar modules. Measurements were performed with a concave mirror and a lens in the room: with room lighting and with an incandescent lamp on; on the street: when the sun's rays hit the module directly, with a mirror and a lens, which were arranged in such a way that the collected light fell at the same time on the photodetector of the luxmeter and on the solar module AK8045. In total of 9 series of experiments were performed. According to the obtained data, a graph of the dependence of the power released on consumers on the solar illumination was constructed. The structure and principle of operation of solar modules, their varieties and properties were analyzed. Made conclusions based on research results
Schneider, Simon Verfasser], Robert [Akademischer Betreuer] Pitz-Paal, and Marek [Akademischer Betreuer] [Behr. "Influences of Mirror Shape Accuracy on Performance Prediction for Parabolic Trough Concentrating Solar Power Systems / Simon Schneider ; Robert Pitz-Paal, Marek Behr." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162451440/34.
Повний текст джерелаGutiérrez, Muñoz Monserrat. "Recubrimientos multicapas de tipo orgánico/metal/cerámica para espejos solares de base polimérica flexible." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC010/document.
Повний текст джерелаThe present production of energy that mainly comes from the burning of fossil fuels has a negative impact on our environment. The research and development of clean and renewable sources of energy can decrease this damage. If the thermodynamic conversion from solar energy obtained by photons radiation concentration allows us a higher efficiency, the challenge is to build at low cost, large areas for solar reflectors that are flexible and lightweight, with a powerful optical reflection.During this research a study was made on two types of mirrors for achieving solar concentrators. The first mirror is formed of a flexible polymer plate highly transparent (Transmission index as high as possible) in which was deposited a reflective layer. This layer is protected against corrosion and any other environmental aggression by an opaque organic coating built on the rear face. This produces a polymer/metal/organic film system. The second mirrors consist of a flexible opaque substrate in which, a reflective film is deposited. A thin organic or ceramic protector film with a transmission index as high as possible is prepared in front of the reflective layer. Thereby, a ceramic/metal/organic system was obtained.Being that the reflective layer is essential in both configurations of the mirror, research was carried out about the development of a reflective layer composed of silver with the dynamic chemical plating technique also called “Jet MetalTM technique” which allows the elaboration of silver films at room temperature in a fast and economical manner. Also, this approved technology <> is well adapted for the deposit development over large surfaces. This report describes the steps and necessary parameters to obtain optical reflectors based on high quality silver: optical quality with a higher reflectivity over 95%, mechanical quality with interfaces of polymer / metal that can absorb deformations, a relation quality/price through the optimization of the deposit kinetic and the silver film thickness (approximately 100 nm) with a very short elaboration time. Many analysis and characterization techniques (XPS, AFM, LRX, SEM…) have been performed to determine the parameters of a solar mirror made of silver.The optical property of the silver film is stable in air ambient and with time. However; the silver protection is necessary mainly on the front face. This protection must adhere to the silver film, be flexible and provide a high visual range. Different varnishes have been researched, and our work has been concentrated in the development of organic (PMMA, PU), ceramics (SiO2, Al2O3), and especially hybrid organic-ceramic covering protection. This research allowed us to identify the relevant areas of these different types of protection coatings under radiation stress, its compatibility with the silver layer to obtain efficient and flexible concentrators. An original solution is presented at the conclusion that corresponds in the elaboration of a flexible mirror, made up of a glass layer of 100 µm thick and covered in a silver film of 100 nm. The reflection is over 95% visible
La producción actual de energía que proviene principalmente de combustibles fósiles tiene un impacto negativo sobre el medio ambiente. El desarrollo de las energías renovables puede reducir este impacto. Si la conversión termodinámica de la energía solar obtenida por concentración de radiación de fotones permite alcanzar altos rendimientos, el reto es lograr realizar, a bajos costos, grandes áreas de reflectores flexibles y ligeros, con una excelente propiedad óptica reflejante.En esta investigación, se estudiaron dos tipos de espejos que intervienen en la consecución de los concentradores solares. El primer espejo está hecho de una placa flexible de polímero altamente transparente (índice de transmisión lo más alta posible) en el que se depositó una película reflejante. Esta capa está protegida contra la corrosión y el ataque del medio ambiente por un revestimiento orgánico opaco desarrollado en la parte trasera. Esto produce un sistema polímero/metal / película orgánica. El segundo espejo consiste en un sustrato opaco flexible en la que se deposita una película reflejante. Una película delgada y protectora orgánica o cerámica con un índice de transmisión lo más alto posible se prepara en frente de la capa reflejante. Por lo tanto, se obtiene un sistema cerámico / metal / orgánico.Siendo esta capa reflejante esencial en ambas configuraciones de espejo, se investigó el desarrollo de una capa reflejante a base de plata con la técnica de depósito químico dinámico, también llamada “JetMetalTM technique” que permite elaborar películas de plata a temperatura ambiente de manera rápida y económica. Además, esta tecnología, aprobada « Green Tech », está bien adaptada para el desarrollo de depósitos sobre superficies grandes. Este trabajo describe los pasos y los parámetros necesarios para obtener reflectores ópticos basados en plata de grandes cualidades: calidad óptica con reflectividad mayor a 95%, calidad mecánica con interfaces de polímero / metal que pueden absorber deformaciones, una relación calidad / precio mediante la optimización de la cinética de depósito y espesor de la película de plata (aproximadamente 100 nm) con un tiempo corto de elaboración. Numerosas técnicas de análisis y caracterización (XPS, AFM, LRX, SEM ...) han sido utilizadas para determinar los parámetros pertinentes de un espejo solar a base de plata. La propiedad óptica de la película de plata es estable en el aire y en el tiempo. Sin embargo, la protección de la plata es necesaria, en particular en el frente. Esta protección debe adherirse a la película de plata, ser flexible y proporcionar un índice de transmisión lo más alto posible en el rango visible. Se han estudiado diferentes barnices y nuestro trabajo ha sido centrado en el desarrollo de recubrimientos de protección orgánicos (PMMA, PU), cerámicos (SiO2, Al2O3) y especialmente en híbridos orgánico-cerámica. Esta investigación ha permitido identificar las áreas de relevancia de estos diferentes tipos de recubrimientos de protección bajo estrés por radiación y su compatibilidad con una capa reflejante de plata para obtener concentradores flexibles eficientes. Una solución original se presenta en la conclusión y corresponde en la realización de un espejo flexible elaborado en una hoja de vidrio de 100 µm de espesor y recubierto con una película de plata de 100 nm. La reflectividad es superior a 95% en el visible
Lin, Qinglong. "Etude, modélisation dynamique et développement d'un capteur solaire thermique à concentration de nouvelle génération." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10099.
Повний текст джерелаThis work is for the purpose to develop a new solar concentrating technology. It covers the presentation of the concept, the prototype realization and the optical and energy study of a new solar concentrator QingSun™. This concentrator has a shape of rectangular parallelepiped and includes linear Fresnel lenses, mirror-lined walls and a mobile solar receptor controlled by a tracking system inside the casing. An optical model and an energy model were developed and validated with a series of experiments. The both models permitted us to examine the function and the energy performance of the concentrator. A parametric study of the influence of the tilt and the orientation was performed and showed that the tilt had more influence than the orientation. Finally, the optimal energy performance of this concentrator was estimated
Rebellato, Jennifer. "Miroirs interférentiels efficaces dans l’extrême ultraviolet pour la physique solaire." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP059.
Повний текст джерелаX-rays and extreme ultraviolet (EUV) light are emitted by excited particles in the solar corona because of its intense activity and extreme temperatures. Recent solar space telescopes in this spectral region showed increased performances thanks to the interference multilayer mirrors on-board. This thesis aims at enhancing such optical coatings, starting with an evaluation of EUV optical constant values available in the literature to select materials more accurately, and to refine optical simulations. This work allows us to introduce better simulations for an accurate calibration of the EUV Full Sun Imager aboard Solar Orbiter. Also, we show that mastering thin films deposition and optical and structural characterization techniques allowed us to develop new Al/Sc-based multilayer coatings reaching record reflectivity values above 40 nm wavelength, which is still a quite unexplored region. These thesis results pave the way for a new and highly efficient generation of solar observation instruments in the EUV, but they also have a remarkable impact in a wider scientific community in need for ever more efficient optical instrumentation in the EUV such as synchrotrons, EUV lithography, X-ray diagnostics, or even X-ray microscopy
Galand, Marina. "Transport des protons dans l'ionosphère aurorale." Phd thesis, Université Joseph Fourier (Grenoble), 1996. http://tel.archives-ouvertes.fr/tel-00724355.
Повний текст джерелаHuang, Hung-Chi, and 黃泓淇. "The Best Arrangement Discuss Solar Concentrator Mirrors." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/xzmgdz.
Повний текст джерела高苑科技大學
電子工程研究所
103
Because of the poor efficiency on solar cells,the replacement of solar panel from reflecting mirror inside solar concentrator will be our goal of research for this time. We use FRED to simulate solar solar concentrator for visible light owns the strongest energy and that is the main reason we choose the discrete sampling function from FRED to capture visible lights from spectrum as stimulate light source. Furthermore, we apply cutting sphere on solar concentrator and set up 50% covering on mask absorption to decrease solar panel functions and place reflecting mirror around to increase condenser effects via light reflecting. On the process we compare three settings, we found out average placement owns slightly better results than the other two. Also, the result shows the efficiency increased on every single light almost equal to 100% of original reflecting on solar concentrator while applied 7 solar panels.
Green, Dylan. "The Role of Mirror Errors in Solar Energy Conversion." Thesis, 2021. http://hdl.handle.net/1885/256580.
Повний текст джерелаHsieh, Jin-Jie, and 謝晉傑. "The Free-Form Mirror Design for Solar Concentrator Module Used in Daylighting System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/53093253878768638241.
Повний текст джерела國立臺灣科技大學
光電工程研究所
102
This paper presents a solar concentrator module which is used in the daylighting system. In the module, plane mirrors are used to reflect the collected sunlight to its destination. Due to the position of the sun changes over time, the plane mirror reflects only certain angles of the light, therefore, we design the free-form mirror to improve the daylighting system performance. The simulation results show the light transmission of the solar concentrator module which uses the free-form mirror design increase 40.6%、38.9% and 52.4% at 11:00 AM、12:00 PM and 1:00 PM, respectively.
Lin, Shen-Nan, and 林信男. "Study on Fabrication and Characterization of Thin Film GaAs Solar Cells with Mirror Reflector on Thermal Dissipation Substrate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/87513212746071834332.
Повний текст джерела國立中興大學
精密工程學系所
98
This thesis presents performance comparison between a GaAs/mirror/copper thin-film solar cell and a conventional GaAs solar cell with a thick GaAs substrate. The GaAs thin-film solar cell is fabricated by transferring a GaAs solar cell onto a AuGe/Au mirror-coated copper substrate. The device performance of GaAs solar cell with different base layer thickness for thin-film and conventional solar cell will be discussed and compared. The base layer thickness leads the performance of solar cell and results in increased photocurrent. The copper substrate thickness of thin films solar cell are 50, 100, 150 and 200 μm, respectively. With the aid of the excellent copper conductor, the thin-film solar cell exhibits significant improvement in both open-circuit voltage (Voc) and short-circuit current (Jsc) density in one-sun AM 1.5G light source. The improved current-voltage (I-V) performance of the thin-film solar cell originates from the following two factors: reduced reverse saturation current by good heat dissipation of copper and enhanced light absorption by the highly reflective AuGe/Au mirror. The role of the mirror can further be verified in the measurement of external quantum efficiency (EQE) response where the thin-film solar cell exhibits a larger EQE response in the wavelength range of 700~900 nm than the conventional GaAs solar cell with the same active absorbing thickness. The device properties of conventional solar cell versus different working temperature show the degradation of cell performance for open circuit voltage and fill factor (FF) due to the degradation of bulk semiconductor material. The GaAs thin films solar cell significantly is improved temperature coefficient of FF by transferring onto a copper substrate. A combined analysis on dVoc/dT, dJsc/dT and dFF/dT, the degradation of the conversion efficiency for conventional GaAs solar cell is improved by the thin-film solar cell with thick copper sub (thickness is 200 μm). The dη/dT value of conventional GaAs solar cell can be alleviated from -0.0235 %/°C to -0.01077 %/°C.
Fong, Sheng-Ping, and 馮聖評. "A Study of the Mirror-Augmented Effect of the Low-Concentration Photovoltaic System (LCPV) Mounted with Solar Tracking Device." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/95353334683427058329.
Повний текст джерела環球科技大學
觀光與生態旅遊系環境資源管理碩士班
102
With the dwindling extraction volume and soaring prices of fossil fuel, people are actively seeking to develop clean, renewable and sustainable energy. Our government has implemented the " Million Rooftop PVs Project" in 2012. Solar tracking PV system was considered one of the more efficient ways of generating solar power. This study aimed to design a simple low-concentration PV system, which is based on the use of the Fresnel lens as the collimation tube, and the installation of mirror-augmented device to improve the efficiency. The results showed that the accuracy of tracking can achieve two degrees or less; although the surface temperature was 6.5℃ higher than the ordinary PV systems, the efficiency can improve up to 27.5%. Furthermore, with careful calculation, the payback period was about nine months. Our suggestions included miniaturization of Fresnel lens and collimation tube; installation of automatic closing mechanism to protect the panels; or reinforcing the cooling device to increase power generation efficiency.