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rss_1.0 Recursos de colección

Archivo Digital UPM (51,012 recursos)
This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Energías Renovables

Mostrando recursos 1 - 20 de 447

1. Viabilidad de una planta de biomasa forestal para la producción de energía eléctrica - Alonso Aguado, Antonio
Este Proyecto estudia la implantación de una central termoeléctrica para la generación de energía en la provincia de Orense. Se trata de una instalación que hace uso de biomasa forestal con el fin de producir energía eléctrica renovable de una manera responsable. En primer lugar se estudia en profundidad la disponibilidad de la biomasa presente en la región que dará lugar al emplazamiento de la instalación, en pos de una posterior toma de decisión acerca del correcto dimensionamiento de la planta, así como la ubicación óptima de la misma. Se ha logrado dar una alternativa a la dependencia energética a...

2. Energía fotovoltaica: Trazador de curvas V-1 para seguimiento de módulos solares - García de la Cruz, Pablo
Definición, construcción y puesta en marcha de un trazador de Curvas I-V en placas fotovoltaicas con fines docentes, comparándolo con otros métodos de medida. Para lo cual se han realizado diferentes ensayos: Barrido de Curva V-I módulo KC50 Barrido de Curva V-I módulo KC85GX-2P Barrido de Curva V-I con sombreado de células Barrido de Curva V-I con conexión en serie y en paralelo Barrido de Curva V-I sin diodos “by-pass” Barrido de Curva V-I con conexión en serie y en paralelo sin diodos “by-pass” Abstract Definition, construction and startup of a tracer IV curves in photovoltaic panels for teaching purposes,...

3. Pre-diseño de una instalación mixta fotovoltaica-térmica para una vivienda - Gaspar Novillo, Gonzalo
El objetivo del presente proyecto es realizar el pre-diseño de una instalación solar mixta fotovoltaica-térmica para satisfacer la demanda eléctrica para iluminación y para parte de las necesidades de energía térmica para agua caliente de una vivienda. El proyecto define las condiciones técnicas de la instalación a partir de la radiación solar registrada en la localización elegida. Además de incluir el estudio económico y los planos correspondientes que indican la viabilidad del mismo. Como puntos a destacar en el proyecto, se puede tomar los datos obtenidos de generación eléctrica y térmica, la viabilidad técnica y económica y el análisis de...

4. Operational costs and reliability in a large rural electrification programme based on solar home systems - Narvarte Fernández, Luis; Carrasco Moreno, Luis Miguel
Experiences in decentralized rural electrification programmes using solar home systems have suffered difficulties during the operation and maintenance phase, due in many cases, to the underestimation of the maintenance cost, because of the decentralized character of the activity, and also because the reliability of the solar home system components is frequently unknown. This paper reports on the reliability study and cost characterization achieved in a large photovoltaic rural electrification programme carried out in Morocco. The paper aims to determinate the reliability features of the solar systems, focusing in the in-field testing for batteries and photovoltaic modules. The degradation rates for...

5. Electrificación rural fotovoltaica "Solar Home Systems". Fiabilidad y costes de mantenimiento - Narvarte Fernández, Luis; Carrasco Moreno, Luis Miguel
La electrificación rural fotovoltaica ha experimentado últimamente un salto de escala tanto en la dimensión de sus programas como en sus sistemas de gestión. Garantizar la calidad técnica ya no se reduce solamente a la fase de dise~o e instalación, sino también a la de operación y mantenimiento. El estudio del Instituto de Energfa Solar de la Universidad Politécnica de Madrid trata de caracterizar la fase de ope ración del programa de electrificación rural fotovoltaico de Marruecos sobre el cual se ha llevado a cabo un exhaustivo estudio de fiabilidad de los distintos componentes que integran los denominados Solar Heme...

6. Operational costs of A 13,000 solar home systems rural electrification programme - Carrasco Moreno, Luis Miguel; Narvarte Fernandez, Luis; Lorenzo Pigueiras, Eduardo
This paper presents an assessment and evaluation of the costs of operation and maintenance (O&M) in a real PV rural electrification (PVRE) programme, with the aim of characterizing its costs structure. Based on the extracted data of the 5-years operational costs of a private operator, the programme has been analyzed to take out the most relevant costs involved in the O&M phase as well as the comparative appraisal between the 3 main activities: installation, O&M and management. Through this study we try to answer to the new challenge of decentralized rural electrification based on larger programmes (with tens of thousands...

7. New method for analytical photovoltaic parameter extraction - Cubas Cano, Javier; Pindado Carrion, Santiago; Farrahi, Assal
Correct modeling of the equivalent circuits regarding solar cell and panels is today an essential tool for power optimization. However, the parameter extraction of those circuits is still a quite difficult task that normally requires both experimental data and calculation procedures, generally not available to the normal user. This paper presents a new analytical method that easily calculates the equivalent circuit parameters from the data that manufacturers usually provide. The analytical approximation is based on a new methodology, since methods developed until now to obtain the aforementioned equivalent circuit parameters from manufacturer's data have always been numerical or heuristic. Results...

8. Wind tunnel analysis on the influence of cantilever parapets on the wind loads on curved roofs - Pindado Carrion, Santiago; Meseguer Ruiz, José; Franchini, Sebastián
Different methods to reduce the high suction caused by conical vortices have been reported in the literature: vertical parapets, either solids or porous, placed at the roof edges being the most analysed configuration. Another method for alleviating the high suction peaks due to conical vortices is to round the roof edges. Very recently, the use of some non-standard parapet configurations, like cantilever parapets, has been suggested. In this paper, its efficiency to reduce suction loads on curved roofs is experimentally checked by testing the pressure distribution on the curved roof of a low-rise building model in a wind tunnel. Very...

9. On the simulation of the UPMSAT-2 microsatellite power - Manuel Navío, Carlos de; Cubas Cano, Javier; Pindado Carrion, Santiago
Simulation of satellite subsystems behaviour is extramely important in the design at early stages. The subsystems are normally simulated in the both ways : isolated and as part of more complex simulation that takes into account imputs from other subsystems (concurrent design). In the present work, a simple concurrent simulation of the power subsystem of a microsatellite, UPMSat-2, is described. The aim of the work is to obtain the performance profile of the system (battery charging level, power consumption by the payloads, power supply from solar panels....). Different situations such as battery critical low or high level, effects of high current charging...

10. New method for analytical photovoltaic parameters identification: meeting manufacturer’s datasheet for different ambient conditions - Cubas Cano, Javier; Pindado Carrion, Santiago; Manuel Navío, Carlos de
At present, photovoltaic energy is one of the most important renewable energy sources. The demand for solar panels has been continuously growing, both in the industrial electric sector and in the private sector. In both cases the analysis of the solar panel efficiency is extremely important in order to maximize the energy production. In order to have a more efficient photovoltaic system, the most accurate understanding of this system is required. However, in most of the cases the only information available in this matter is reduced, the experimental testing of the photovoltaic device being out of consideration, normally for budget...

11. The cup anemometer, a fundamental meteorological instrument for the wind energy industry - Pindado Carrion, Santiago; Cubas Cano, Javier; Sorribes-Palmer, Félix
The cup anemometer has been used widely by the wind energy industry since its early beginning, covering two fundamental aspects: wind mill performance control and wind energy production forecast. Furthermore, despite modern technological advances such as LIDAR and SODAR, the cup anemometer remains clearly the most used instrument by the wind energy industry. Together with the major advantages of this instrument (precision, robustness), some issues must be taken into account by scientists and researchers when using it. Overspeeding, interaction with stream wakes due to allocation on masts and wind- mills, loss of performance due to wear and tear, change of performance due...

12. Explicit expressions for solar panel equivalent circuit parameters based on analytical formulation and the Lambert W - Function - Cubas Cano, Javier; Pindado Carrion, Santiago; Manuel Navío, Carlos de
Due to the high dependence of photovoltaic energy efficiency on environmental conditions (temperature, irradiation...), it is quite important to perform some analysis focusing on the characteristics of photovoltaic devices in order to optimize energy production, even for small-scale users. The use of equivalent circuits is the preferred option to analyze solar cells/panels performance. However, the aforementioned small-scale users rarely have the equipment or expertise to perform large testing/calculation campaigns, the only information available for them being the manufacturer datasheet. The solution to this problem is the development of new and simple methods to define equivalent circuits able to reproduce the...

13. Desarrollo de una metodología para la integración anual de centrales híbridas termosolares fósiles bajo condiciones variables de demanda eléctrica - García Martínez, Juan Carlos
Estudio de la generación de energía eléctrica y el consumo de combustible anual de una central híbrida termosolar-fósil. Dada una central de ciclo combinado, se estudiarán sus posibilidades de hibridación con un tipo de campo solar. El estudio contemplará cuatro tipos de datos: el recurso solar de la región, la curva de demanda eléctrica de la central, la topología de la planta híbrida (dependiendo de la opción de hibridación que se considere) y las condiciones de operación.

14. On the analytical approach for modeling photovoltaic systems behavior - Cubas Cano, Javier; Pindado Carrion, Santiago; Victoria Pérez, Marta
The 1-diode/2-resistors electric circuit equivalent to a photovoltaic system is analyzed. The equations at particular points of the I–V curve are studied considering the maximum number of terms. The maximum power point as a boundary condition is given special attention. A new analytical method is developed based on a reduced amount of information, consisting in the normal manufacturer data. Results indicate that this new method is faster than numerical methods and has similar (or better) accuracy than other existing methods, numerical or analytical.

15. Some developments on cup anemometer aerodynamics - Pindado Carrion, Santiago; Cubas Cano, Javier
In the present study the geometry of cups is experimentally studied through anemometer performance. This performance is analyzed in two different ways. On the one hand the anemometer transfer function between cases is compared. On the other hand the stationary rotation speed is decomposed into constant and harmonic terms, the comparison being established between the last ones. Results indicate that some cup shapes can improve the uniformity of anemometer rotation, this fact being important to reduce degradation due to ageing.

16. Fourier analysis of the aerodynamic behavior of cup anemometers - Pindado Carrion, Santiago; Pérez Sarasola, Imanol; Aguado Roca, Maite
The calibration results (the transfer function) of an anemometer equipped with several cup rotors were analyzed and correlated with the aerodynamic forces measured on the isolated cups in a wind tunnel. The correlation was based on a Fourier analysis of the normal-to-the-cup aerodynamic force. Three different cup shapes were studied: typical conical cups, elliptical cups and porous cups (conical-truncated shape). Results indicated a good correlation between the anemometer factor, K, and the ratio between the first two coefficients in the Fourier series decomposition of the normal-to-the-cup aerodynamic force

17. Extracting energy from Vortex-Induced Vibrations: A parametric study - Barrero-Gil, Antonio; Pindado Carrion, Santiago; Avila Sanchez, Sergio
Here, Vortex-Induced Vibrations (VIVs) of a circular cylinder are analyzed as a potential source for energy harvesting. To this end, VIV is described by a one-degree-of-freedom model where fluid forces are introduced from experimental data from forced vibration tests. The influence of some influencing parameters, like the mass ratio m∗ or the mechanical damping ζ in the energy conversion factor is investigated. The analysis reveals that: (i) the maximum efficiency ηM is principally influenced by the mass-damping parameter m∗ζ and there is an optimum value of m∗ζ where ηM presents a maximum; (ii) the range of reduced velocities with significant...

18. Analysis of calibration results from cup and propeller anemometers. Influence on wind turbine Annual Energy Production (AEP) calculations - Pindado Carrion, Santiago; Vega, Enrique; Martínez, Alejandro; Meseguer, Encarnación; Franchini, Sebastián; Pérez Sarasola, Imanol
The calibration coefficients of several models of cup and propeller anemometers were analysed. The analysis was based on a series of laboratory calibrations between January 2003 and August 2007. Mean and standard deviation values of calibration coefficients from the anemometers studied were included. Two calibration procedures were used and compared. In the first, recommended by the Measuring network of Wind Energy Institutes (MEASNET), 13 measurement points were taken over a wind speed range of 4 to 16  m  s−1. In the second procedure, 9 measurement points were taken over a wider speed range of 4 to 23  m  s−1. Results indicated no significant differences...

19. Estudio técnico-económico del criterio distancia foco emisor y estructura almacén de CO2. Aplicación a un caso de estudio en la Cuenca del Duero. - Hernández Díaz, Álvaro
El presente proyecto tiene como objeto la evaluación del parámetro distancia entre focos de emisión de CO2 y estructuras geológicas apropiadas para su almacenamiento, según los datos publicados por el Registro Estatal de Emisiones y Fuentes Contaminantes (PRTR España) y por el proyecto ALGECO2. El parámetro distancia analizado es referido a proyectos de Captura, Transporte y Almacenamiento de CO2 (proyectos CAC) a gran escala. Para ello se ha realizado un estudio en la zona de la Cuenca del Duero aplicando criterios de selección tanto técnicos como socio-económicos, según las recomendaciones de organizaciones como la Agencia Internacional de la Energía o el...

20. Aerodynamic Analysis of Cup Anemometers Performance: The Stationary Harmonic Response - Pindado Carrion, Santiago; Cubas Cano, Javier; Sanz Andres, Angel Pedro
The effect of cup anemometer shape parameters, such as the cups’ shape, their size, and their center rotation radius, was experimentally analyzed.This analysis was based on both the calibration constants of the transfer function and the most important harmonic termof the rotor’smovement,which due to the cup anemometer design is the third one.This harmonic analysis represents a new approach to study cup anemometer performances. The results clearly showed a good correlation between the average rotational speed of the anemometer’s rotor and the mentioned third harmonic term of its movement.

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