Ponencias (Ingeniería Energética)

URI permanente para esta colecciónhttps://hdl.handle.net/11441/11364

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Athilea, una herramienta de cálculo para el estudio de soluciones de aislamiento interior en fachadas
(Asociación Española de Direción e Ingenería de Proyectos (AEIPRO), 2023-10) Monge Palma, Rafael; Guerrero Delgado, María del Carmen; Cerezo Narváez, Alberto; Sánchez Ramos, José; Álvarez Domínguez, Servando; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
Reformar un edificio puede ser un desafío cuando las condiciones urbanísticas, arquitectónicas o constructivas no permiten aislar desde el exterior. Especialmente, cuando supone aumentar la ocupación, reducir la separación a linderos y/o invadir medianeras colindantes. Para dar cumplimiento a la normativa y permitir que los edificios puedan proporcionar niveles adecuados de confort y demanda energética, la mejora de la envolvente térmica tendrá que ser ejecutada por el interior. Este trabajo presenta una herramienta VBA Excel® que permite evaluar el impacto del aislamiento de fachadas por el interior en la pérdida de suelo útil y mejora de demanda. A partir de un catálogo de seis edificios representativos del parque edificatorio español (tres edificios multifamiliares y tres unifamiliares con distinta compacidad, forma y volumetría), el usuario puede definir todos los elementos de la envolvente, así como la ciudad, zona climática y aislamiento a comparar, permitiendo cuantificar el coste esperado de la perdida de suelo y evaluar el cumplimiento de los requisitos normativos en materia de ahorro energético. De este modo, se consigue realizar una rápida y precisa toma de decisiones para la renovación profunda de un edificio hasta alcanzar el nivel de edificio nZEB o Passivhaus, conociendo sus implicaciones energéticas y económicas.
Estrategias de mitigación del efecto de isla de calor urbana y su impacto en los edificios
(Asociación Española de Direción e Ingenería de Proyectos (AEIPRO), 2023-10) Palomo Amores, Teresa Rocío; Guerrero Delgado, María del Carmen; Montero Gutiérrez, Paz; Sánchez Ramos, José; Álvarez Domínguez, Servando; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
Las temperaturas en el interior de las viviendas y su entorno urbano aumentan cada año, especialmente en climas cálidos, alejándose cada vez más de las condiciones de confort deseadas. La escasez de vegetación y el uso de materiales convencionales en las zonas urbanas llevan a un empeoramiento de las condiciones ambientales, alimentando el efecto de isla de calor urbana. Asimismo, este afecta el confort en el interior de los edificios, aumentando el gasto eléctrico en climatización y, consecuentemente, las emisiones de gases de efecto invernadero. Este trabajo evalúa el impacto de la transformación urbana en la demanda y confort térmico de los edificios colindantes de un espacio urbano. Este se enclava en la Avenida Cruz Roja de Sevilla, objeto de una intervención real de diseño urbano bioclimático. Para ello, los edificios involucrados se organizan en clústeres, evaluando el impacto en la demanda y confort interiores de las distintas medidas de mitigación propuestas en cada clúster. De este modo, la adaptación al cambio climático no sólo proporciona las condiciones necesarias para que la ciudadanía vuelva a disfrutar de la vida en la calle, sino que también beneficia a los edificios, reduciendo su demanda e incrementando el confort de sus ocupantes.
Solución radiante para el acondicionamiento térmico de estancias de corta duración
(Asociación Española de Direción e Ingenería de Proyectos (AEIPRO), 2023-10) Montero Gutiérrez, Paz; Cerezo Narváez, Alberto; Otero-Mateo, Manuel; Pastor-Fernández, Andrés; Álvarez Domínguez, Servando; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
El espacio urbano es un lugar hostil para los ciudadanos de grandes urbes del sur de Europa. Asimismo, el uso de transporte público se ve reducido en temporada estival por efectos de la isla de calor. Estas circunstancias propician que los peatones no usen las áreas urbanas para ocio. Por este motivo, la creación de refugios climáticos es fundamental para mejorar el confort térmico de sus ocupantes. Este estudio propone el diseño de una parada de autobús autosuficiente, a instalar en la ciudad de Sevilla, que proteja a sus habitantes del clima. Su autosuficiencia es posible mediante la integración de la tecnología Falling-Film e incorporación de módulos radiantes de refrigeración. A partir del prototipado de una marquesina, se evalúa su comportamiento en el seno de una cámara climática, totalmente sensorizada, con el propósito de estudiar la eficiencia de los sistemas. De esta forma, los resultados obtenidos en el experimento se centran en el análisis de flujos de calor convectivo y radiante en diferentes condiciones de funcionamiento, garantizando que el 60% del flujo de calor total se debe a la radiación. Igualmente, imágenes termográficas demuestran el correcto funcionamiento de la estancia, que alcanza condiciones de confort en 20 minutos.
Comparison of the representativeness of solar radiation type of days from the viewpoint of the production of parabolic trough and central receiver plants
(American Institute of Physics, 2022-05) Moreno Tejera, Sara; Jiménez Valero, Paola; Pérez Aparicio, Elena; Lillo Bravo, Isidoro; Silva Pérez, Manuel Antonio; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP122: Termodinámica y Energías Renovables
The classification of days according to the solar radiation features is one of the tools frequently used for the solar resource assessment, modelling or forecasting. Recent studies discuss the appropriate classification method or number of types of days, but these studies usually don’t take into account, at least in an explicit way, the relation between the types of days and the yield of solar plants. In this work, we compare the representativeness of the types of days defined by two classification methods from the viewpoint of the production of a Central Receiver (CR) and a Parabolic Trough (PT) solar plant. The selected classification methods are based on the daily solar radiation features: energy, variability and temporal distribution. So, in a first step, the days of a period of 16 years of measurements recorded in Seville (Spain) are classified by these two methods. In a second step, the daily gross productions of both CSP plants are estimated using System Advisor Model program. Then, the representativeness of the types of days of each classification method is evaluated according to the production of the CR and the PT plant by means of a methodology based on the clear sky yield index or kp index. Finally, the ARE and the annual relative RMSE and the MAE for the plants and classification methods analyzed are compared. Then, we can conclude, that the representativeness of the types of days of a classification method has a certain dependence on the plant that depends on the classification method applied.
A methodology to design air-cooled condensers for supercritical power cycles using carbon dioxide and carbon dioxide mixtures
(Universität Duisburg-Essen, 2023-04) Rodríguez de Arriba, Pablo Enrique; Crespi, Francesco Maria; Sánchez Martínez, David Tomás; Muñoz Blanco, Antonio; Universidad de Sevilla. Departamento de Ingeniería Energética; European Union’s Horizon 2020 research and innovation programme under grant agreement N ° 814985; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
The SCARABEUS project investigates the use of CO₂–based mixtures as working fluid in power cycles for nextgeneration Concentrated Solar Power plants. These fluids exhibit a critical temperature higher than pure CO₂, enabling dry condensation of the working fluid even at the high ambient temperatures typical of sites with a high solar radiation. As a consequence, the SCARABEUS power cycle achieves higher thermal efficiency than standard sCO₂ cycles, whose performance deteriorates significantly with ambient temperature. In any case, the actual feasibility of this concept is still to be confirmed by a complete techno-economic assessment. To that purpose, it is critical to accurately estimate the power consumption of the Heat Rejection Unit (HRU), which is one of the most important parasitic loads of the system. Bearing all this in mind, this manuscript presents the design of a horizontal, direct air-cooled condenser (ACC). The bundle geometry proposed is comprised of seven tubes in three passes, with a staggered arrangement. The complete thermal model, developed in MatLab, has been already disclosed by the SCARABEUS consortium in a previous paper, and validated both experimentally in a dedicated test rig and against results obtained by the commercial software Xace®. The novelty in the present manuscript lies in the integration of this thermal model of the tubes with a complete design and integration tool of the whole heat rejection sub-system, including the design of a rotoronly axial fan and supporting frame. The impact of several design parameters (i.e., air temperature rise, acceptable hot pressure drops, tube length) is studied, taking into account auxiliary power consumption, footprint and cycle efficiency as main figures of merit. Two candidate mixtures are taken into account, identified in previous works by the same authors (85%CO₂-15%C6F6 and 80%CO₂-20%SO₂), and a pure sCO₂ case is also considered for the sake of comparison. The results show that, for a given gross cycle output, using pure sCO₂ yields the smallest ACC with the lowest fan power consumption. Moreover, tube length and air face velocity are found to be the key-parameters driving the design process of an ACC, for which increasing tube length is always beneficial as far as the ACC design is concerned. Finally, various considerations regarding the role played by the optimum design of the ACC within the global optimisation of the power plant are made. It is found that the rationale employed for the design of the ACC may be in conflict with that used from an overall plant optimisation standpoint. It is hence concluded that the definition of the optimal design space of an Air-cooled Heat Exchanger (ACHE) must be included in the global optimisation of the power plant.
Methanol-based thermochemical storage for energy-saving district heating networks
(ECOS 2023, 2023-07) Rodríguez Pastor, Diego Antonio; Carvajal Trujillo, Elisa; Soltero Sánchez, Víctor Manuel; Chacartegui, Ricardo; Becerra Villanueva, José Antonio; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
With the increasing volatility in natural gas markets and the need for residential heat, research for alternative fuels is necessary for several regions. This paper presents a high-duration thermochemical energy storage system (TCES) based on methanol, evaluating its integration with district heating networks, offering a renewable solar-based storage solution and low-temperature heat generation from the exothermic discharge reaction heat. The system eliminates greenhouse gas emissions by using concentrated solar thermal energy to decompose methanol into synthesis gas. Applying the optimised operational thermodynamic parameters, it is possible to satisfy the thermal demand of 892 households in Spain through 12 MW of concentrated solar energy supported by 10 hours of energy storage. Storage efficiencies exceeding 30% and chemical conversion efficiencies exceeding 65% have been demonstrated, resulting in a combined efficiency of 55% for the heating network and methanol TCES. The results show a levelized cost of storage (LCOS) highly competitive with other storage systems (<100 €/MWh), given the simplicity and flexibility of the proposed system.
Los ruedos agrícolas de la Sierra de Huelva caracterización y líneas de intervención en paisajes sostenibles
(Asociación Interprofesional de Ordenación del Territorio FUNDICOT, 2016) Ghislanzoni, Michela; Bernal Márquez, Manuel; Torres-García, Miguel; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
Los ruedos agrícolas de la Sierra de Huelva son parte de un sistema agrario vernáculo heredado de una economía aislada de subsistencia. Poseedores de unas cualidades materiales e inmateriales específicas, su supervivencia peligra debido a la crisis del modelo agrícola tradicional. Este artículo describe los estudios previos a un futuro Plan de Ordenación del Territorio Subregional, referidos a la identificación, delimitación, caracterización, cualificación y diagnóstico de los ruedos agrícolas de un total de sesenta núcleos de población para, finalmente, elaborar criterios para una ordenación, uso y gestión sostenibles.
New Concept for High Temperature Thermal Energy Storage Using a Concrete Tank
(EuroSun, 2022) Cabesa, Luisa F.; Vérez, David; Zsembinszki, Gabriel; Borri, Emiliano; Prieto Ríos, Cristina; Universidad de Sevilla. Departamento de Ingeniería Energética; Ministerio de Ciencia e Innovación (MICIN). España; European Union (UE); Ministerio de Ciencia, Innovación y Universidades (MICINN). España; Ministerio de Ciencia, Innovación y Universidades (MICINN). España
The use of concrete is showing great potential as thermal energy storage material for concentrating solar power plants (CSP) due to its versatility, relatively low cost, and the possibility to reach a high operating temperature, above 500ºC thus increasing the plant efficiency. However, actual configurations based on concrete show different drawbacks including difficulties during the manufacturing on-site, different thermal expansion coefficients between concrete and pipes, and poor thermal conductivity of concrete. In order to address those challenges, this study proposes a new TES concrete tank concept based on three main pillars: modularity, improved concrete formulation, and direct contact concept. A preliminary assessment of the thermal performances of the new concept was analyzed through simulations showing the temperature distribution of the modules.
Life Cycle Assessment of Innovative Concentrated Solar Power Plants Using Supercritical Carbon Dioxide Mixtures
(ASME. American Society of Mechanical Engineers, 2022-10-28) Liao, Xun; Chalumeau, Sophie; Crespi, Francesco Maria; Prieto Ríos, Cristina; López Román, Antón; Rodríguez de Arriba, Pablo Enrique; Martínez Sanz, Noelia; Sánchez Martínez, David Tomás; Paggini, Andrea; David, Pierre-Luc; Universidad de Sevilla. Departamento de Ingeniería Energética; Sánchez Martínez, David Tomás; European Union’s Horizon 2020 research and innovation programme under grant agreement Nº814985; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
The SCARABEUS project, funded by the European Commission, is currently investigating the potential gains brought about by the utilization of carbon dioxide mixtures in supercritical power cycles of Concentrated Solar Power plants, in lieu of the common Rankine cycles based on steam turbines or even pure carbon dioxide cycles. The analysis has already confirmed that it is possible to attain thermal efficiencies higher than 51% when ambient temperatures exceed 40°C, which is unheard of when conventional technology or standard CO₂ technology is used. Additionally, this extraordinary performance is achieved with simpler cycle layouts, therefore with lower capital costs. The additives considered include organic and inorganic compounds which are added to the raw carbon dioxide in a variable proportion, depending on the composition of the additive and on ambient temperature. Regardless, it is important to assess whether or not there is an additional environmental advantage in terms of carbon dioxide and other potential hazards brought about by the new chemicals in the system. This is presented in this paper where the results obtained so far by the consortium for the carbon footprint from a Life Cycle perspective are discussed. Along with the assumptions and methodology, the results are compared for three reference plants: state-of-the-art CSP plant based on steam turbines, innovative CSP plant using pure supercritical CO₂ technology, and the SCARABEUS concept using supercritical CO₂ mixtures. The results are promising as they suggest that it is possible to reduce the carbon footprint of a 110 MWe CSP plant to be significantly less than 27kgCO₂/MWh from the fifth assessment report of the Intergovernmental Panel on Climate Change (IPCC AR5).
Adoption of CO2 blended with C6F6 as working fluid in CSP plants
(AIP Publishing, 2022-05-12) Manzolini, Giampaolo; Binotti, Marco; Morosini, Ettore; Sánchez Martínez, David Tomás; Crespi, Francesco Maria; Marcoberardino, Gioele Di; Iora, Paolo; Invernizzi, Costante Mario; Universidad de Sevilla. Departamento de Ingeniería Energética; Sánchez Martínez, David Tomás; Universidad de Sevilla. TEP137: Motores Térmicos
The adoption of CO2-based mixtures as power block working fluid for CSP plant can turn supercritical CO2 cycles into efficient transcritical cycles even at high ambient temperature, with significant performance improvement and potential power block cost reduction. In this work, the use of CO2+C6F6 mixture as working fluid for a power cycle coupled with a solar tower is analyzed. Two different cycle maximum temperatures (550°C and 650°C) are considered and for both configurations the overall plant design is performed. The yearly energy yield is computed with hourly data and the LCOE is minimized varying storage and cycle recuperator sizes. Results show comparable results for the innovative working fluid and for the sCO2 cycles
The potential of supercritical cycles based on CO₂ mixtures in Concentrated Solar Power plants: an exergy-based analysis
(Technical University of Munich, 2021-10-13) Crespi, Francesco Maria; Rodríguez de Arriba, Pablo Enrique; Sánchez Martínez, David Tomás; Muñoz Blanco, Antonio; Sánchez Lencero, Tomás Manuel; Universidad de Sevilla. Departamento de Ingeniería Energética; Sánchez Martínez, David Tomás; Unión Europea (Horizonte 2020); Universidad de Sevilla. TEP137: Motores Térmicos
This paper, developed in the context of the SCARABEUS project funded by the Horizon 2020 programme of the European Commission, focuses on the thermodynamic comparison between pure supercritical Carbon Dioxide and blended transcritical Carbon Dioxide power cycles by means of a thorough exergy analysis. A reference power plant based on a steam Rankine cycle and representative of the current state of the art of Concentrated Solar Power plants is selected as base-case. Afterwards, four cycles are added to the comparison. Two of these cycles employ pure CO2, with either a Recompression or a Partial Cooling layout, whereas two cycles employ CO2-based mixtures with either Hexafluorobenzene (CO2-C6F6) or Titanium Tetrachloride (CO2-TiCl4) with a Precompression and a Recuperated Rankine. The figures of merit used to carry out the second-law analysis are exergy efficiency and exergy destruction in the main components of the cycle. Two different cases are identified, corresponding to two temperatures of the energy (heat) source: 575oC and 725oC. The first one is representative of the peak temperatures achieved by the molten salts used in modern Concentrated Solar Power plants. 725oC will expectedly be achieved by next generation systems and it is hence assessed with the aim to unfold the true potential of the concept proposed. The results show that at 575oC pure sCO2 power cycles are clearly outperformed by steam Rankine cycles whilst, at 725oC, they are able to achieve higher thermal and exergy efficiencies, in the order of 49% and 72% respectively. When compared to state-of-the-art Rankine cycles using steam, blended-sCO2 power cycles enable thermal efficiency gains of up to 1.1 and 6 percentage points at 575oC and 725oC respectively, with exergy efficiencies of up to 75.2%.
Potential and challenges of the utilization of CO2-mixtures in supercritical power cycles of Concentrated Solar Power plants
(2022-02-22) Sánchez Martínez, David Tomás; Crespi, Francesco Maria; Rodríguez de Arriba, Pablo Enrique; Muñoz Blanco, Antonio; Manzolini, Giampaolo; Invernizzi, Costante Mario; Di Marcoberardino, Gioele; White, Martin; David, Pierre-Luc; Universidad de Sevilla. Departamento de Ingeniería Energética; Sánchez Martínez, David Tomás; Unión Europea; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
The potential of supercritical Carbon Dioxide power cycles to supersede subcritical steam turbine technology in Concentrated Solar Power applications is widely acknowledged. Some differential features of the former are higher efficiency at similar temperatures (in the range from 600 to 750ºC), smaller footprint, higher flexibility and lower cost. Several theoretical and experimental R&D projects are currently working on aspects such as component development (turbomachinery and heat exchangers), system integration into the solar subsystem (receiver and thermal energy storage system), operability, materials… Nevertheless, whilst progress is being made at a very high pace, there is still a great deal of uncertainty regarding how much sCO2 technology will be able to reduce the cost of solar thermal electricity with respect to contemporary CSP technology. This is mostly caused by the sensitivity of cycle performance to ambient temperature, bringing about a large efficiency drop when this temperature exceeds 35ºC. The root cause for this performance drop is the unfeasibility of compression near the critical point, where the very high density of the fluid reduces density and, therefore, compression work. The SCARABEUS project is based on the addition of certain dopants to carbon dioxide in order to yield a working mixture with higher critical pressure and temperature. As a consequence of these modified critical properties of the fluid, compression near the critical point is enabled even at ambient temperatures as high as 40-45ºC. Moreover, at these high temperatures, condensation and compression in liquid state are still possible. The characteristics of the new working fluids have been proved to enable thermal efficiencies higher than 50% for minimum cycle temperatures as high as 60ºC, hence boosting the performance of CSP plants well beyond of the capabilities of systems based on steam turbines. This implies a substantial reduction of the cost of the plant. Nevertheless, whilst the thermal and economic performances are more favourable for CO2-mixtures, new technical challenges must be faced if the technology is to be mature: thermal stability and potential hazards of the dopants, new turbomachinery and heat exchanger designs adapted to the composition of the mixture, phase separation, materials (selection, compatibility and degradation) and others. This paper introduces the main advantages and technical potential of the SCARABEUS technology along with a discussion of the main challenges faced by the consortium in order to demonstrate the technology and beyond.
Thermodynamic Assessment and Optimisation of Supercritical and Transcritical Power Cycles Operating on CO2 Mixtures by Means of Artificial Neural Networks
(2022-02-22) Rodríguez de Arriba, Pablo Enrique; Crespi, Francesco Maria; Sánchez Martínez, David Tomás; Universidad de Sevilla. Departamento de Ingeniería Energética; Unión Europea; Universidad de Sevilla. TEP137: Máquinas y Motores Térmicos
Closed supercritical and transcritical power cycles operating on Carbon Dioxide have proven to be a promising technology for power generation and, as such, they are being researched by numerous international projects today. Despite the advantageous features of these cycles enabling very high efficiencies in intermediate temperature applications, the major shortcoming of the technology is a strong dependence on ambient temperature; in order to perform compression near the CO2 critical point (31ºC), low ambient temperatures are needed. This is particularly challenging in Concentrated Solar Power applications, typically found in hot, semi-arid locations. To overcome this limitation, the SCARABEUS project explores the idea of blending raw carbon dioxide with small amounts of certain dopants in order to shift the critical temperature of the resulting working fluid to higher values, hence enabling gaseous compression near the critical point or even liquid compression regardless of a high ambient temperature. Different dopants have been studied within the project so far (i.e. C6F6, TiCl4 and SO2) but the final selection will have to account for trade-offs between thermodynamic performance, economic metrics and system reliability. Bearing all this in mind, the present paper deals with the development of a non-physics-based model using Artificial Neural Networks (ANN), developed using Matlab’s Deep Learning Toolbox, to enable SCARABEUS system optimisation without running the detailed – and extremely time consuming – thermal models, developed with Thermoflex and Matlab software. In the first part of the paper, the candidate dopants and cycle layouts are presented and discussed, and a thorough description of the ANN training methodology is provided, along with all the main assumptions and hypothesis made. In the second part of the manuscript, results confirms that the ANN is a reliable tool capable of successfully reproducing the detailed Thermoflex model, estimating the cycle thermal efficiency with a Root Mean Square Error lower than 0.2 percentage points. Furthermore, the great advantage of using the Artificial Neural Network proposed is demonstrated by the huge reduction in the computational time needed, up to 99% lower than the one consumed by the detailed model. Finally, the high flexibility and versatility of the ANN is shown, applying this tool in different scenarios and estimating different cycle thermal efficiency for a great variety of boundary conditions.
Ciclo de mejora en el estudio de la gestionabilidad de la tecnología termosolar cilindroparabólica en el mercado energético
(Universidad de Sevilla, 2020) Prieto Ríos, Cristina; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
El trabajo muestra el ciclo de mejora implementado en la asignatura de Centrales Solares del Grado de Ingeniería de la Energía, y en concreto, en la tecnología de concentración cilindropabólica. El objetivo del ciclo era que los alumnos llegaran a comprender dos conceptos fundamentales de la tecnología; el primero era que la energía termosolar es una solución energética renovable y gestionable que da respuesta a las necesidades del mercado energético. En segundo lugar, que los alumnos comprendieran que los sistemas de almacenamiento térmico son el componente clave de la tecnología que permite ajustar la curva de producción a la curva de demanda, incluso cuando no hay recurso solar disponible. Tras la implementación de un modelo metodológico basado en las ideas de los alumnos y de las alumnas y en las actividades de contrate, el ciclo de mejora implementado ha cumplido con los objetivos establecidos.
Sensitivity analysys and potential evaluation using building thermal mass combined with DSM strategies
(EDP Sciences, 2019) Pavón Moreno, María del Carmen; Sánchez Ramos, José; Guerrero Delgado, María del Carmen; Molina Félix, José Luis; Álvarez Domínguez, Servando; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
The objective of the work is to develop an algorithm that automatically manages the activation of the heat pump in response to the most appropriate strategies according to the pricing and operating conditions. It is interesting to see if a balance can be reached between the cost savings, the increase in energy consumed, the thermal comfort of the occupants and the contribution to the reduction of the peak loads. The study shows different results and conclusions, highlighting the important influence of various factors on the results obtained, such as user behavior, constructive quality of the building and electric pricing. Connection with a future renewable production can maximize the economic savings; it is interesting the use of buildings as thermal storage of unused photovoltaic surplus. Finally, the possibility of combining these measures with electrical storage and with the possible arbitration linked to renewable production.
Evaluation of the behavior of an innovative thermally activated building system (TABS) with PCM for an efficient design
(EDP Sciences, 2019-08) Guerrero Delgado, María del Carmen; Sánchez Ramos, José; Álvarez Domínguez, Servando; Tenorio Ríos, José Antonio; Cabeza, Luisa F.; Bartolomé, César; Pavón Moreno, María del Carmen; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
The global energy crisis has caused a double effect. On the one hand, users are increasingly aware of the energy cost they face. On the other hand, public administrations have become aware of the importance of limiting energy consumption in buildings as a way to combat climate change and reduce the energy dependence with the climate. This situation supposes a great opportunity for innovative constructive solutions with an energetic behaviour that surpasses the traditional approach of reduction of the transmittance. In this work, studies are presented to obtain potential of a new solution thermally activated with two innovations with respect to those existing in the market: its activation is done by hot / cold water produced by renewable systems; and its concrete structural element in addition to having coupled the heat exchanger presents an innovative mortar doped with PCM microencapsulated phase change material.
Design of a real prototype of a hybrid fuell cell suv: vehicle "Hercules
(European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2007) Guadix, P.A.; Pino Lucena, Francisco Javier; Martínez, J.J.; Rosa Iglesias, Manuel Felipe; López, E.; Universidad de Sevilla. Departamento de Ingeniería Energética
Hydrogen is becoming one of the most feasible energy vectors to succeed gasoline as fuel. It has the potential to be obtained from renewable energy sources, having almost a null impact on contamination. Oil wells are drying up and oil does not fulfil the ZEV (zero emission vehicle) program of contamination. These reasons lead to think that oil will pass the baton to hydrogen as the next energetic vector for automotive applications. In addition, hydrogen has the advantage of being used directly in fuel cells which have higher efficiency than internal combustion engines (ICE). Project Hércules consists of the construction of a real sport utility vehicle (SUV) prototype of a fuel cell vehicle (FCV) based in the model Santana 350. It will be fuelled by hydrogen obtained totally renewably by using an electrolyser fed by solar energy. This paper shows, in this framework, all the steps that are needed to be covered to specify the power of the fuel cell, battery and electric motor using the simulation tool ADVISORTM to match the desired specifications.
Experimental and numerical investigaton of a pem fuel cell. Single cell and stack analysis
(2008) Iranzo Paricio, José Alfredo; Rosa Iglesias, Manuel Felipe; López, Eduardo; Pino Lucena, Francisco Javier; Valverde Isorna, Luis; Bermejo, Pablo; Universidad de Sevilla. Departamento de Ingeniería Energética
The present paper describes the work being done by INTA and University of Seville – AICIA in the framework of a joint research project in the field of Proton Exchange Membrane Fuel Cells (PEMFC). The main objective of the project is to develop a novel methodology for the characterization and investigation of fuel cell stacks, that combines experimental and Computational Fluid Dynamics (CFD) analysis. A CFD model based on the PEMFC Module implemented in FLUENT software is being developed for a single cell, and the polarization curve obtained is being validated against experimental results obtained at INTA facilities. At a second stage of the investigation, a method for the extrapolation of CFD single cell results to the complete stack is developed. The extrapolation method is being validated against experimental results obtained for the fuel cell stack with different numbers of cells. This paper describes the results of the early stages of the investigation and presents the methodology developed for the project. The developed model would allow researchers to use CFD for the complete fuel cell stack with reasonable computing facilities.
Innovative concepts of Integrated Solar Combined Cycles (ISCC) using a Solid Oxide Fuell Cell (SOFC)
(Universidad de Málaga, 2018) Pino Lucena, Francisco Javier; Rosa Iglesias, Manuel Felipe; Rodríguez, E.; Guerra Macho, José Julio; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. TEP143: Termotecnia
Concentrating Solar Power (CSP) is one of the most promising ways for electricity production of the upcoming years with high penetration of intermittent renewable energy sources such as wind and solar-photovoltaics. This is due to the fact that CSP when coupled to Thermal Energy Storage (TES) system enables large, inexpensive and flexible energy dispatch, which contributes to energy grid stabilization. At the same time, TES allows for steady operation of the power block by reducing undesirable fluctuations due to weather transient conditions and increasing the number of hours that the power block operates at design conditions 1. Despite the abovementioned advantages of CSP systems, a step further is needed for increase overall system efficiency and decrease CO2 emissions. Several studies have been performed considering high efficiency plant layouts such as combined cycle. For the latter, several works have been investigated about solar integration of combined cycle using parabolic trough and solar tower technologies. In both cases, solar energy was used for water/steam preheating and evaporation steps of the Rankine cycle in combination with the exhaust gases of fossil-fuel gas turbine engine. However, no research has been performed considering ISCC coupled with a Solid Oxide Fuel Cell (SOFC). In this research, two innovative layouts of ISCC power plants will be analyzed. First considers a ISCC based on solar tower and second a ISCC with a parabolic trough collector field coupled to the Heat Recovery Steam Generator (HRSG). The objective of this research is analyze the energy behavior of both layouts, selecting the best ISCC scheme to be coupled with a SOFC. The simulations will be performed using Thermoflex software. In both layouts, a SOFC is introduced before the combustion chamber at the topping cycle, and a Rankine cycle (bottoming cycle) with 2 pressures is considered.
Energetic analysis of a hydrogen refuelling station in Seville province district project Hercules
(International Society of Electrochemisty, 2008) Pino Lucena, Francisco Javier; Rosa Iglesias, Manuel Felipe; Iranzo Paricio, José Alfredo; Valverde Isorna, Luis; López González, E.; Bermejo Morillo, P.; Universidad de Sevilla. Departamento de Ingeniería Energética
In 2006, HERCULES Project was launched with two objectives. First, design and build the first hydrogen refuelling station at South of Spain, in Seville province. Hydrogen will be produced via an electrolyser connected to a Photovoltaic Field. Second, change internal combustion engine of a SUV vehicle into an electric engine fed using a PEM Fuel Cell. Hydrogen produced at station will be consumed by the electric vehicle. Project Hercules is promoted by several partners: Santana, Hynergreen, Abengoa Solar, INTA, AICIA, Carburos Metalicos, GreenPower and Agencia Andaluza de la Energía. The objectives of this article are: describing the hydrogen refuelling station and analyse it, taking into account solar radiation, hydrogen production and estimated consumption by vehicle, and electric consumption of auxiliaries (compressor and dispenser).

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