García Gorostiaga, M. Almudena

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https://academica-e.unavarra.es/handle/2454/50944

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García Gorostiaga

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M. Almudena

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Ingeniería

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ISC. Institute of Smart Cities

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0000-0002-4553-7288

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88467

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1623

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    PublicationOpen Access
    Evaluación de la aplicabilidad del año de referencia UNE-EN ISO 15927 ainstalaciones fotovoltaicas
    (Fundación General de la Universidad Politécnica de Madrid, 2014) Torres Escribano, José Luis; Blas Corral, María Ángeles de; García Gorostiaga, M. Almudena; García Ruiz, Ignacio; Proyectos e Ingeniería Rural; Landa Ingeniaritza eta Proiektuak
    El desarrollo y expansión de las tecnologías de aprovechamiento de la energía solar hace necesario disponer de datos meteorológicos representativos de un determinado lugar que permitan predecir el comportamiento energético de estos sistemas a largo plazo. Existen numerosos procedimientos para la composición de Años Meteorológicos Típicos (TMYs). No obstante, el único método normalizado para la construcción de años de referencia es el descrito en la norma UNE-EN ISO 15927-4. Este método está orientado a la construcción de años sintéticos para la estimación de cargas térmicas en la edificación. En este trabajo se evalúa la aplicabilidad del método UNE-EN ISO a instalaciones fotovoltaicas, comprobándose la bondad de los años de referencia obtenidos en la estimación de la energía eléctrica anual producida por un sistema fotovoltaico.
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    PublicationOpen Access
    On the measurement of stability parameter over complex mountainous terrain
    (Copernicus Publications, 2022) Cantero Nouqueret, Elena; Sanz, Javier; Borbón, Fernando; Paredes, Daniel; García Gorostiaga, M. Almudena; Institute of Smart Cities - ISC
    Atmospheric stability has a significant effect on wind shear and turbulence intensity, and these variables, in turn, have a direct impact on wind power production and loads on wind turbines. It is therefore important to know how to characterise atmospheric stability in order to make better energy yield estimation in a wind farm. Based on the research-grade meteorological mast at Alaiz (CENER's test site in Navarre, Spain) named MP5, this work compares and evaluates different instrument set-ups and methodologies for stability characterisation, namely the Obukhov parameter, measured with a sonic anemometer, and the bulk Richardson number based on two temperature and one wind speed measurement. The methods are examined considering their theoretical background, implementation complexity, instrumentation requirements, and practical use in connection to wind energy applications. The sonic method provides a more precise local measurement of stability while the bulk Richardson is a simpler, robust and cost-effective technique to implement in wind assessment campaigns. Using the sonic method as a benchmark, it is shown that to obtain reliable bulk Richardson measurements in onshore sites it is necessary to install one of the temperature sensors close to the ground where the temperature gradient is stronger.
  • Thumbnail Image
    PublicationOpen Access
    A GIS-based methodology for assigning experimental measurements of angular distribution of sky radiance and luminance to selected sky sectors
    (Elsevier, 2019) García Ruiz, Ignacio; García Gorostiaga, M. Almudena; Torres Escribano, José Luis; Ingeniería; Ingeniaritza; Institute of Smart Cities - ISC
    Mathematical models for the estimation of the angular distribution of diffuse radiance/luminance in the sky describe the anisotropic character of diffuse solar radiation and daylight in the sky vault. In most of these models the radiance/luminance of a sky point is determined by the product of the indicatrix function and the gradation function. When developing and/or calibrating these models, it is typical to consider separately the dispersion effects in the direction of the sun's rays and the gradation from the zenith towards the horizon. To do this, the sky is divided into a number of concentric spherical zones around the sun and a number of concentric spherical zones around the zenith. The intersection between both sets of zones delimits a series of sky elements. Unfortunately, these sky elements do not correspond to the 145 patches of sky vault recommended by the International Commission on Illumination (CIE), which are routinely scanned by the existing commercial sky scanners. The identification of the sky elements, geometrically different from those observed by commercial sky scanners, and the assignation of the radiance/luminance values registered by such sky scanners are not analytically trivial tasks. A GISbased methodology is presented in this work to undertake these goals.