Examinando por Autor "Velásquez-López, A."

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    Impact analysis of compressed hygroscopic particulate material
    (International Journals of Engineering and Sciences Publisher, 2016-01-01) Aramburo-Londoño, M.; Pérez-Cardona, S.; Calle-Escobar, M.; Velásquez-López, A.; Mejía-Gutiérrez, R.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
    This article presents a dynamic analysis of the behaviour of a sample of hygroscopic particulate compressed material in the context of diverse scenarios of the product's lifecycle. The analysis is executed using two complementary methods: (a) an experimental study that recreates a particular impact situation in a controlled physical environment, and (b) a static virtual analysis developed under the Finite Element Method (FEM) for the evaluation of vibration effects on the product. The objective of the analysis is to determine, on one hand, the precise compressing pressure that enables the powder to maintain cohesion throughout the handling and transporting stages, and yet be easily disaggregated manually for it to be used as intended in the final stage of its lifecycle. On the other hand, it is expected of both simulations to estimate an incidence in the behaviour of the compressed powder sample derived from its geometric characteristics and its particular handling and transportation situation, with the goal of defining ideal conditions for the product packaging. © February 2016 IJENS.
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    Influence of epoxy resin as encapsulation material of silicon photovoltaic cells on maximum current
    (EDP Sciences, 2017-01-01) Acevedo-Gómez, D.; Velásquez-López, A.; Osorio-Gómez, G.; Mejía-Gutiérrez, R.
    This work presents an analysis about how the performance of silicon photovoltaic cells is influenced by the use of epoxy resin as encapsulation material with flat roughness. The effect of encapsulation on current at maximum power of mono-crystalline cell was tested indoor in a solar simulator bench at 1000 w/m and AM1.5G. The results show that implementation of flat roughness layer onto cell surface reduces the maximum current inducing on average 2.7% less power with respect to a cell before any encapsulation. The losses of power and, in consequence, the less production of energy are explained by resin light absorption, reflection and partially neutralization of non-reflective coating. © The Authors, published by EDP Sciences, 2017.