Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"solar concentration"”.
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New Vistas in Solar Concentration with Gradient Index Optics
… innovations in the fields of optical design and solar concentration are presented: a) the derivation of fundamentally new gradient-index (GRIN) distributions for perfect optical instruments. For the first time, GRIN lenses for visible and solar radiation with refractive index distributions that …
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HIGHLY-CONCENTRATED SUNLIGHT SEPARATION FOR WIDE-SPECTRUM SOLAR ENERGY HARVESTING
… current technologies aiming to utilize broader solar spectrum ranges have either expensive fabrication processes or low solar concentration performances. This thesis introduces the dispersive optical system (DOS), designed with commercially available optical components, which separates incoming …
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Tuning energy transport in solar thermal systems using nanostructured materials
Solar thermal energy conversion can harness the entire solar spectrum and theoretically achieve very high efficiencies while interfacing with thermal storage or back-up systems for dispatchable power generation. Nanostructured materials allow us to tune the spectral properties and heat transfer …
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Growth and Characterization of Type-II Submonolayer ZnCdTe/ZnCdSe Quantum Dot Superlattices for Efficient Intermediate Band Solar Cells
… in fabricating an efficient intermediate band solar cell.</p> <p>Intermediate band solar cells can potentially have an efficiency of 63.2% under full solar concentration, but the material systems investigated until now are far from optimum and are fraught with growth related issues including …
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Development and investigation of integrated solar systems for hydrogen and methanol production
… applications. Storage of H2 produced from solar energy in synthetic fuels is a key step in moving towards an eventual hydrogen economy. By conversion to synthetic fuels such as methanol, hydrogen and solar energy may be directly utilised in current infrastructures as liquid fuels for …
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Experimental investigation of a novel sonic hydrogen generator
… such as temperature and isopropyl alcohol concentration are used to evaluate the hydrogen production process. Presented results indicate a variability in hydrogen production rates under different experimental conditions. For instance, distilled water at 25°C yields a hydrogen production …
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Nanofluid-based receivers for high-temperature, high-flux direct solar collectors
Solar power plants with surface receivers have low overall energy conversion efficiencies due to large emissive losses at high temperatures. Alternatively, volumetric receivers promise increased performance because solar radiation can be transferred into a fluid medium, which subsequently reduces …
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Optimization of the holographic process for imaging and lithography
… multispectral CGHs applied for high efficiency solar concentration and spectral splitting. A second lithographic system based on optically recorded total internal reflection (TIR) holograms is studied. A comparative analysis between scalar and (cont.) vector diffraction theories for the modeling …
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Molecular and active interfaces : controlling the adhesion of low surface tension fluids and solid microparticles
… in many industrial processes including solar concentration and solar PV, where reflectivity and transmissivity are vital to overall efficiency. Prior studies in this area have focused on minimizing particle-surface adhesion via modifying the surface energy of the substrate. Using an …
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Design and Application of Waveguide Holographic Optical Elements
… as holographic displays (combiners), holographic solar concentrators, etc. The first application of waveguide HOEs that will be discussed in this dissertation is in the field of solar concentration. Many solar modules have large inactive module surface areas (IM-SA) that are not covered by active …
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Luminescent solar concentrator structures for solar energy harvesting and radiation control
Luminescent solar concentrators are devices capable of converting some spectral components of solar radiation by luminescence and concentrating them before collection by photovoltaic. The aim of this thesis is to design, develop and demonstrate the principle of all-inorganic semitransparent …
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Solar thermoelectric power conversion : materials characterization to device demonstration
… change threatening our planet as we know it. Solar energy technologies are a promising, sustainable and clean alternative due to the vast abundance of sunlight. Thus far, photovoltaic solar cells and concentrated solar power are considered to be the most promising approaches. Solar cells …
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Development of solar thermophotovoltaic systems = Desarrollo de sistemas termofotovoltaicos solares
… experimental, de los sitemas termofotovoltaicos solares. En estos sistemas, un material (emisor) se calienta hasta la incandescencia mediante radiaci ón solar. La radiación térmica emitida por dicho material se dirige hacia una célula fotovoltaica, que convierte dicha radiación en electricidad. …
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Characterization of type-II GaSb quantum rings in GaAs solar cells
The use of nanostructured materials in solar cells enables one to tune their absorption properties leading to a better match to the solar spectrum and subsequently an increased photocurrent through the solar cell. Type II GaSb/GaAs quantum rings (QRs) can significantly extend the spectral response …
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Analysis and Optimization of the Scheffler Solar Concentrator
<p>The Scheffler reflector is a new solar concentrator design which maintains a fixed focus while only having a single axis tracking mechanism. This design makes the construction and operation of high temperature solar concentrators accessible to developing nations. In this project, I wrote …