Examinando por Materia "V-Trough"

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    Ítem
    Influencing the performance of a Building Integrated low-Concentration Photovoltaic (BICPV) system by adapting an Anti-Reflective Coating (ARC) with a pyramidal texture
    (Universidad EAFIT, 2021) Bernal del Río, Santiago; Osorio Gómez, Gilberto
    The generation of electric energy from photovoltaic solar energy brings a new opportunity to reduce generation costs, in addition to reducing the emission of greenhouse gases. This type of generation has positioned itself as the most important for renewable energies, especially because of the impact it has had on generation on an industrial scale. However, in the residential sector, different strategies are proposed within the framework of the best use of the available area in order to reduce costs, as is the case of low-concentration photovoltaic concentration systems. This document proposes the development of an Anti-Reflective Coating (ARC) with a pyramidal texture in two dimensions for a V-Trough type photovoltaic concentrator, specifically for a Building Integrated low-Concentration Photovoltaic (BICPV), with the aim of increasing the light capture of these systems due to the loss caused by the rays coming from incidence angles different from the normal surface. For this, a methodology is executed where the concentrator is designed, the material for the Anti-Reflective Coating is determined, the design of the geometry of the texture, and, later, simulations are carried out by means of ray tracing, and experimental validation, where finally data is taken in real time of the generation of the CPV with the texture, and, it is checked how the application of this texture affects in a positive way the generation of the photovoltaic system, with increases of more than 3% in the normalized efficiency.
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    Ítem
    Solar beam radiation modeling for design and simulation of V-Trough photovoltaic applications
    (Universidad EAFIT, 2017) Arias Rosales, Andrés; Mejía-Gutiérrez, Ricardo
    Photovoltaic V-Troughs use simple and low-cost non-imaging optics, namely flat mirrors, to increase the solar harvesting area by concentrating the solar rays towards the photovoltaic surface -- Combined with stepped manual tracking, these devices can boost the performance of regular solar cells for residential and personalized scenarios in developing countries -- The geometrical set-up of a V-Trough, related to its length and angular parameters, conditions the optical phenomena that occur as the solar beam radiation dynamically interacts with the surfaces of the device -- These phenomena, such as shadows and consecutive reflections, determine the solar radiation that is effectively concentrated towards the photovoltaic area -- To support the design and simulation of such devices, this research project proposes a theoretical model of their effective concentration, seeking a high flexibility in the geometrical inputs, a detailed output of the optical phenomena involved and a low computational demand -- The model is based on the geometrical optics of beam solar radiation and it was experimentally validated in a statistical comparison against experimental measurements performed in a laser testing platform -- Based on the model, several design performance indicators were established: i) Ce (the average effective concentration); ii) Cost (the cost of materials); iii) Tsp (the space required) -- Moreover, from the integration of these indicators in proportional comparisons, three multi-objective indices were proposed: a) ICOE (Ce versus Cost); b) MICOE (Ce versus Cost and Ce versus Tsp combined); c) MDICOE (the same comparison as the previous one but also including the discretization effects related to the solar cells) – As tools for supporting the V-Trough set-up definition process, an interactive software and a series of genetic algorithms were developed based on these indicators and indices and the modeling framework developed -- The proposed software, named “VTDesign”, allows a V-Trough designer to iterate and compare diverse design alternatives in real-time by means of a visualization of the optical performance, representations of the geometrical set-ups and a cost-effectiveness analysis -- Among the genetic algorithms studied, a new genetic algorithm, named “GA-WA” (Genetic Algorithm - Weibull Arias), was proposed -- This tool uses heuristic processes, based on biomimicry and Weibull probability distributions, in order to optimize the indicators and indices as fitness/objective functions -- The intuition and the more holistic exploration of a trained engineer with VTDesign can be complemented with the broader and less biased evolutionary optimization of GAWA -- In a design case study, both VTDesign and GA-WA were implemented and found to be effective in the indices improvement, as well as efficient and flexible tools in the problem of defining the set-up of a solar V-Trough in a given personalized scenario