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    Performance improvement by temperature control of an open-cathode PEM fuel cell system  Open access

     Strahl, Stephan; Perrier, Michel; Husar, Attila Peter; Riera Colomer, Jordi; Serra Prat, Maria
    International Conference on Fundamentals & Development of Fuel Cells
    Presentation's date: 2013-04
    Presentation of work at congresses

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    The work presented in this article combines experimental analysis and theoretical studies of temperature effects on the performance of an open-cathode, self-humidified PEM fuel cell system for the design of optimization strategies. The experimental analysis shows the great potential of improving the system performance by proper temperature management. The most significant temperature dependent parameters of the system under study are the activation polarization and the water content of the ionomer of the catalyst layer. An Extremum seeking control algorithm is proposed to regulate the temperature to a voltage maximum. However, the slow dynamics of the temperature related catalyst-drying effect on performance complicate the optimal thermal management via model-free control strategies.

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    Experimental analysis of a degraded open-cathode PEM fuel cell stack  Open access

     Strahl, Stephan; Gasamans Rodríguez, Noemí; Llorca Pique, Jordi; Husar, Attila Peter
    Iberian Symposium on Hydrogen Fuel Cells and Advanced Batteries
    Presentation's date: 2013
    Presentation of work at congresses

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    The well-known challenges to be overcome in PEM fuel cell research are their relatively low durability and high costs for the platinum catalysts. Thus, this work focuses on factors that impact durability and the links to the fuel cell performance. Therefore a degraded, open-cathode, 20-cell, PEM fuel cell stack, which was used in a laboratory test station for characterization experiments, was analyzed experimentally. Voltage transients during external perturbations, such as changing temperature, humidity and stoichiometries show that degradation affects individual cells quite differently throughout the lifetime of the stack. Electrochemical impedance spectroscopy (EIS) data presents non-reversible catalyst layer and membrane degradation of several cells. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) are in progress in order to validate the results of the electrical analysis and elucidate catalyst and membrane degradation.

  • Experimental study of hydrogen purge effects on performance and efficiency of an open-cathode proton exchange membrane fuel cell system

     Strahl, Stephan; Husar, Attila Peter; Riera Colomer, Jordi
    Journal of power sources
    Date of publication: 2013
    Journal article

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    The performance and efficiency of an open-cathode PEM fuel cell system in dead-ended anode (DEA) configuration and hydrogen purges is analyzed in this work. Excess water and crossed-over nitrogen in the anode decrease the hydrogen concentration at the catalyst surface, which in turn causes performance losses. Purging the anode with hydrogen removes water and nitrogen and thus recovers the performance. However, this means wasting hydrogen and decreasing overall system efficiency. Gas chromatography was used to detect and quantify the accumulated nitrogen in the anode during DEA operation. The experiments show that the major performance limitation in the studied system is related to water instead of nitrogen. Moreover, oxygen was detected in the anode exhaust gas after long purge intervals, which is an indicator for corrosion of the cathode carbon support structure. Experimental observations revealed that the need for a hydrogen purge strongly depends on the operating conditions and the state-of-health of the fuel cell. It is shown that flooding on the anode and drying of the cathode catalyst layer may occur simultaneously during purged operation. Therefore, purge decisions must be evaluated online, depending on the operating conditions.

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    Water transport study in high temperature fuel cell stack  Open access

     Bezmalinovic, Dario; Husar, Attila Peter
    Congreso Nacional de Pilas de Combustible
    Presentation's date: 2012
    Presentation of work at congresses

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    This work presents analysis of water transport phenomena in the 120 Wel high temperature PEM fuel cell stack. Phosphoric acid doped PBI membranes are known for their abilities to work with dry gases; however water in the electrolyte still plays an integral role in the proton conduction mechanism. The presence of water in the membrane increases proton conductivity, however at high operating temperatures in the anhydrous environment phosphoric acid can dehydrate consequently lowering its conductivity. Therefore, understanding of water transport in the PBI- H3PO4 membranes is important as it can explain certain phenomena inside the cell. Tests have shown that water transport from cathode to anode due to water accumulation rises almost linearly with current density while decreases with cathode stoichiometry. Water transport seems to be independent of operating temperature. Also, in some cases, reverse flow water transport (from anode to cathode) appears to take place near the outlet. Ohmic resistance was also found to decrease slightly with an increase in current density and lower stoichiometries.

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    Study of hydrogen purge effects on performance and efficiency of a PEM fuel cell system  Open access

     Strahl, Stephan; Husar, Attila Peter; Riera Colomer, Jordi
    Congreso Nacional de Pilas de Combustible
    Presentation's date: 2012
    Presentation of work at congresses

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    Experimental analysis and CFD modeling is used in this work to analyze system efficiency related to hydrogen purge based water management in an open-cathode PEM fuel cell system. Excess water in a deadended anode decreases hydrogen concentration at the active catalyst surface and thus causes fuel cell performance losses. Purging the anode with hydrogen removes water and nitrogen that diffused through the membrane but also means wasting energy and thus decreasing overall system efficiency. Experiments with a 100W open-cathode stack have revealed that the need for a hydrogen purge strongly depends on the operation conditions and the state-of-health of the fuel cell and therefore the decision to perform a purge has to be evaluated online. A dynamic 2D CFD model of a single cell within the stack is used to investigate water distribution and transport within the cell before, during and after performing a purge at different operating conditions, linked to cell performance. Moreover, the model is capable of studying water transfer dynamics across the membrane and along the channel, including liquid water saturation. Altogether, the presented experimental and modeling work helps to improve the understanding of water transport in a PEM fuel cell and thus facilitates the development of strategies for increasing system efficiency and optimizing the water management by properly controlling the hydrogen purge.

  • Experimental characterization methodology for the identification of voltage losses of PEMFC: applied to an open cathode stack

     Husar, Attila Peter; Strahl, Stephan; Riera Colomer, Jordi
    International journal of hydrogen energy
    Date of publication: 2012
    Journal article

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  • Performance indicators for the dynamics modeling and control of PEMFC systems  Open access

     Husar, Attila Peter
    Defense's date: 2012-03-07
    Department of Heat Engines, Universitat Politècnica de Catalunya
    Theses

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    Society is gradually becoming aware that the current energy industry, based on the use of fossil fuels, is inefficient, highly polluting and has a finite supply. Within the scientific community, there are indications that hydrogen (H2) as an energy vector, obtained from renewable energy sources, can represent a viable option to mitigate the problems associated with hydrocarbon combustion. In this context, the change from the current energy industry to a new structure with a significant involvement of H2 facilitates the introduction of fuel cells as elements of energy conversion. Polymer Electrolyte Membrane Fuel Cells (PEMFC) are gaining increased attention as viable energy conversion devices for a wide range of applications from automotive, stationary to portable. In order to optimize performance, these systems require active control and thus in-depth knowledge of the system dynamics which include fluid mechanics, thermal dynamics and reaction kinetics. One of the main issues, with respect to proper control of these systems, is the understanding of the water transport mechanisms through the membrane and the liquid water distribution. The thesis is based on the publication of nine international journal articles that are divided into 4 sub-topics: Dynamic fuel cell modeling, fuel cell system control-oriented analysis, identification of parameters and performance indicators and finally, fault and failure detection and system diagnosis. In the sub-topic of Dynamic Fuel cell modeling, experimentally validated Computational Fluid Dynamics (CFD) modeling is used to relate the effects of the physical phenomena associated with fluid mechanics and thermal dynamics, that occur inside the fuel cell [Alonso, 2009][Strahl, 2011], to water distribution. However, since these CFD models cannot be directly used for control, control-oriented models [Kunusch, 2008][Kunusch, 2011] have been developed in parallel. As well, another study is done in [Serra, 2006] which includes a controllability analysis of the system for future development and application of efficient controllers. The results of the above mentioned studies are limited because either they do not incorporate an electrochemical model or the model is not experimentally validated. Moreover, these models do not take into account the voltage losses due to liquid water inside the fuel cell. Therefore, there is a need to properly relate the relevant effects of fluid mechanics and thermal dynamics, including liquid water, to the fuel cell voltage. Primarily, methodologies are needed to determine the relevant indicators associated to the effect of water on the fuel cell performance. The works published in [Husar, 2008] and [Husar, 2011] treats experimental parameter identification, mainly focused on water transport through the membrane and fuel cell voltage loss indicators respectively. The implementation of the indicators indirect measurement methodology provides an experimental way for the isolation of three main types of voltage losses in the fuel cell: activation, mass transport and ohmic losses. Additionally since these voltage loss indicators relate the fuel cell operating conditions to the fuel cell voltage, they can be utilized to calibrate and validate CFD models as well as employed in novel control strategies. On the other hand, to develop reliable systems, the controller should not only take into account performance variables during standard operation but should also be able to detect failures and take the appropriate actions. A preliminary study on failure indicators is presented in [Husar 2007] and fault detection methodologies are described in [de Lira 2011]. As a whole, the compilation of articles represented in this thesis applies a comprehensive experimental approach which describes the implementation of novel methodologies and experimental procedures to characterize and model the PEMFC and their associated systems taking into consideration control oriented goals.

    La societat s'està adonant que la indústria energètica actual, basada en l'ús de combustibles fòssils, és ineficient, molt contaminant i té un subministrament limitat. Dins de la comunitat científica, hi ha indicis que el hidrogen (H2) com vector energètic, obtingut a partir de fonts d'energia renovables, pot representar una opció viable per a mitigar els problemes associats amb la combustió d'hidrocarburs. En aquest context, el canvi de la indústria energètica actual a una nova estructura amb una important participació de el hidrogen exigeix la introducció de les piles de combustible com elements de conversió d'energia. Les piles de combustible de membrana polimèrica (PEMFC) estan tenint cada vegada més atenció com a dispositius viables de conversió d'energia per a una àmplia gamma d'aplicacions com automoció, estacionàries o portàtils. Amb la finalitat d'optimitzar el seu rendiment, les piles PEM requereixen un control actiu i per tant un coneixement profund de la dinàmica del sistema, que inclou la mecànica de fluids, la dinàmica tèrmica i la cinètica de les reaccions. Un dels temes principals relacionat amb el control adequat d'aquests sistemes és la comprensió dels mecanismes de transport d'aigua a través de la membrana i la distribució d'aigua líquida. Aquesta tesi es basa en nou articles publicats en revistes internacionals que es divideixen en 4 subtemes: la modelització dinàmica de piles de combustible, l'anàlisi orientada al control del sistema, la identificació de paràmetres i d’indicadors de funcionament i, finalment, la detecció de fallades i la diagnosi dels sistemes. En el sub-tema de la modelització dinàmica de piles PEM, la modelització basada en la Dinàmica de Fluids Computacional (CFD) amb validació experimental s'ha utilitzat per a relacionar els efectes dels fenòmens físics de la mecànica de fluids i de la dinàmica tèrmica que es produeixen dintre de la pila [Alonso, 2009] [ Strahl, 2011] amb la distribució d'aigua. No obstant això, com aquests models CFD no poden ser utilitzats directament per al control, s'han desenvolupat models orientats a control [Kunusch, 2008] [Kunusch, 2011] en paral·lel. A més, en un altre estudi [Serra, 2006] s'inclou una anàlisi de control·labilitat del sistema per al desenvolupament i aplicació futurs de controladors eficaços. Però els resultats dels estudis esmentats anteriorment són limitats, ja sigui perquè no incorporen un model electroquímic o bé perquè no han estat validats experimentalment. A més, cap dels models té en compte les pèrdues de tensió degudes a l'aigua líquida dins de la pila de combustible. Per tant, hi ha una necessitat de relacionar adequadament els efectes rellevants de la mecànica de fluids i de la dinàmica tèrmica, incloent l'aigua líquida, amb el voltatge de la pila de combustible. Principalment, són necessàries metodologies per a determinar els indicadors rellevants associats a aquest efecte de l'aigua sobre el rendiment de la pila de combustible. Els treballs publicats en [Husar, 2008] i [Husar, 2011] tracten la identificació experimental de paràmetres, centrada en el transport d'aigua a través de la membrana i els indicadors de pèrdua de tensió, respectivament. L'aplicació d'una proposta de metodologia de mesura indirecte dels indicadors permet l'aïllament dels tres tipus principals de pèrdues de voltatge en la pila de combustible: l'activació, el transport de massa i les pèrdues ohmiques. Aquests indicadors de pèrdua de tensió relacionen les condicions d'operació amb el voltatge de la pila de combustible i per tant poden ser utilitzats per a calibrar i validar models CFD, així com per a definir noves estratègies de control. D'altra banda, per a aconseguir sistemes fiables, el controlador no només ha de considerar els indicadors de funcionament de l'operació normal, sinó que també ha de detectar possibles fallades per a poder prendre les accions adequades en cas de fallada. Un estudi preliminar sobre indicadors de fallades es presenta en [Husar 2007] i una metodologia de detecció de fallades completa es descriu en [Lira de 2011]. En el seu conjunt, el compendi d'articles que formen aquesta tesi segueix un enfocament experimental i descriu la implementació de noves metodologies i procediments experimentals per a la caracterització i el modelatge de piles PEM i els sistemes associats amb objectius orientats al control eficient d'aquests sistemes.

    La sociedad se ésta dando cuenta de que la industria energética actual, basada en el uso de combustibles fósiles, es ineficiente, muy contaminante y tiene un suministro limitado. Dentro de la comunidad científica, hay indicios de que el hidrógeno (H2) como vector energético, obtenido a partir de fuentes de energía renovables, puede representar una opción viable para mitigar los problemas asociados con la combustión de hidrocarburos. En este contexto, el cambio de la industria energética actual a una nueva estructura con una importante participación de H2 exige la introducción de pilas de combustible como elementos de conversión de energía. Las pilas de combustible de membrana polimérica (PEMFC) están ganando cada vez más atención como dispositivos viables de conversión de energía para una amplia gama de aplicaciones como automoción, estacionarias o portátiles. Con el fin de optimizar su rendimiento, las pilas PEM requieren un control activo y por lo tanto un conocimiento profundo de la dinámica del sistema, que incluye la mecánica de fluidos, la dinámica térmica y la cinética de las reacciones. Uno de los temas principales relacionado con el control adecuado de estos sistemas, es la comprensión de los mecanismos de transporte de agua a través de la membrana y la distribución de agua líquida. Esta tesis se basa en la publicación de nueve artículos en revistas internacionales que se dividen en 4 sub-temas: el modelado dinámico de pilas de combustible, el análisis orientado a control del sistema, la identificación de parámetros e indicadores de desempeño y, por último, la detección de fallos y la diagnosis. En el sub-tema de la modelización dinámica de pilas PEM, el modelado basado en Dinámica de Fluidos Computacional (CFD) con validación experimental se ha utilizado para relacionar los efectos de los fenómenos físicos de la mecánica de fluidos y la dinámica térmica que se producen dentro de la pila [Alonso, 2009] [ Strahl, 2011] con la distribución de agua. Sin embargo, como estos modelos CFD no pueden ser utilizados directamente para el control, modelos orientados a control [Kunusch, 2008] [Kunusch, 2011] se han desarrollado en paralelo. Además, en otro estudio [Serra, 2006] se incluye un análisis de controlabilidad del sistema para el futuro desarrollo y aplicación de controladores eficaces. Pero los resultados de los estudios mencionados anteriormente son limitados, ya sea porque no incorporan un modelo electroquímico o bien porque no son validados experimentalmente. Además, ninguno de los modelos tiene en cuenta las pérdidas de tensión debidas al agua líquida dentro de la pila de combustible. Por lo tanto, hay una necesidad de relacionar adecuadamente los efectos relevantes de la mecánica de fluidos y la dinámica térmica, incluyendo el agua líquida, con la tensión de la pila de combustible. Principalmente, son necesarias metodologías para determinar los indicadores relevantes asociados al efecto del agua sobre el rendimiento de la pila de combustible. Los trabajos publicados en [Husar, 2008] y [Husar, 2011] tratan la identificación experimental de parámetros, centrada en el transporte de agua a través de la membrana y los indicadores de pérdida de tensió, respectivamente. La aplicación de una metodología propuesta de medición indirecta de los indicadores permite el aislamiento de los tres tipos principales de pérdidas de tensión en la pila de combustible: la activación, el transporte de masa y las pérdidas óhmicas. Éstos indicadores de pérdida de tensión relacionan las condiciones de operación con la tensión de la pila de combustible y por lo tanto pueden ser utilizados para calibrar y validar modelos CFD, así como para definir nuevas estrategias de control. Por otro lado, para conseguir sistemas fiables, el controlador no sólo debe considerar los indicadores de desempeño de la operación regular, sino que también debe detectar posibles fallos para poder tomar las acciones adecuadas en caso de fallo. Un estudio preliminar sobre indicadores de fallos se presenta en [Husar 2007] y una metodología de detección de fallos completa se describe en [Lira de 2011]. En su conjunto, el compendio de artículos que forman esta tesis sigue un enfoque experimental y describe la implementación de nuevas metodologías y procedimientos experimentales para la caracterización y el modelado de pilas PEM y los sistemas asociados con objetivos orientados al control eficiente de estos sistemas.

  • Desarrollo de sistemas de control para la mejora de la eficiencia y la vida útil en sistemas basados en pilas de combustible PEM

     Sarmiento Carnevali, Maria Laura; Kunusch, Cristian; Husar, Attila Peter; Riera Colomer, Jordi; Batlle Arnau, Carles; Strahl, Stephan; Massana Hugas, Immaculada; Simo Mezquita, Ester; Creemers, Tom Lambert; Serra Prat, Maria
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  • Experimental characterization and identification of the voltage losses in an open cathode PEM fuel cell stack

     Husar, Attila Peter; Strahl, Stephan; Riera Colomer, Jordi
    Iberian Syposium on Hydrogen, Fuel Cells and Advanced Batteries
    Presentation's date: 2011
    Presentation of work at congresses

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  • Propulsión del Segway RMP 200 mediante pilas de combustible tipo PEM

     Asunción Escorsa, Enric; Castañeda Mañe, Eduard; Husar, Attila Peter
    Iberian Syposium on Hydrogen, Fuel Cells and Advanced Batteries
    Presentation's date: 2011
    Presentation of work at congresses

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  • Control-oriented modeling and experimental validation of a PEMFC generation system

     Kunusch, Cristian; Mayosky, Miguel Angel; Puleston, Paul; Husar, Attila Peter
    IEEE transactions on energy conversion
    Date of publication: 2011-09
    Journal article

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    An experimentally validated control-oriented model that reproduces the most typical features of a laboratory proton exchange membrane fuel cell generation system, is presented in this paper. The proposed representation is a 7th order fully analytical nonlinear model of ordinary differential equations, primarily focused on the system gases dynamics. The complete model is developed following a modular procedure, combining theoretical modeling techniques and empirical analysis based on experimental data. The presented methods can be used as a general modeling guideline for control-oriented purposes, being possible to adapt to other fuel-cell-based systems with similar characteristics.

  • Diseño e implementación de sistemas de control para pilas de combustible pem y su integración en sistemas distribuidos de generación

     Garcia, Vanesa Mariel; Riera Colomer, Jordi; Sarmiento Carnevali, Maria Laura; Kunusch, Cristian; Montoto Gayete, Amadeo; Creemers, Tom Lambert; Husar, Attila Peter; Serra Prat, Maria
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  • LPV Observer design for PEM fuel cell system: Application to fault detection

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Husar, Attila Peter
    Journal of power sources
    Date of publication: 2011-02-01
    Journal article

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    In this paper, the modelling of an energy generation system based on polymer electrolyte membrane fuel cell (PEMFC) system through a parameter varying approach (LPV model), that takes in to account model parameter variation with the operating point, is presented. This model has been obtained through a Jacobian linearization of the PEMFC non-linear dynamic model that was previously calibrated using real data from lab. In order to illustrate the use of the LPV model obtained its application to model-based fault detection is used. For this purposes a set of common fault scenarios, which could appear during a normal PEMFC operation, is used as case study.

  • Development and experimental validation of a dynamic thermal and water distribution model of an open cathode proton exchange membrane fuel cell

     Strahl, Stephan; Husar, Attila Peter; Serra Prat, Maria
    Journal of power sources
    Date of publication: 2011
    Journal article

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  • Desarrollo y calibración experimental de un modelo de un sistema de generación de energía basado en una pila de tipo PEM

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Husar, Attila Peter
    Congreso Nacional de Pilas de Combustible
    Presentation's date: 2010-06
    Presentation of work at congresses

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    En este trabajo se presenta un modelo dinámico de una pila de combustible tipo PEM comercial (Ballard Nexa 1.2 kW) así como la calibración experimental de sus parámetros a partir de dados reales de laboratorio. La calibración se realiza resolviendo el problema de ajuste de datos de un sistema real (datos de laboratorio) utilizando un proceso de optimización por mínimos-cuadrados no-lineales.. Finalmente, se ha implementado un simulador a partir del modelo calibrado experimentalmente que ha permitido contrastar la bondad del modelo comparándolo con el comportamiento real del sistema.

  • LPV model-based fault diagnosis using relative fault sensitivity signature approach in a PEM fuel cell

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Husar, Attila Peter
    Mediterranean Conference on Control and Automation
    Presentation's date: 2010-06-23
    Presentation of work at congresses

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    Robust LPV model-based sensor fault diagnosis using relative fault sensitivity signature and residual directions approaches in a PEM fuel cell  Open access

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo, Joseba; Husar, Attila Peter
    IEEE Vehicle Power and Propulsion Conference
    Presentation's date: 2010
    Presentation of work at congresses

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    In this paper, a model-based fault diagnosis methodology for PEM fuel cell systems is presented. The methodology is based on computing residuals using an LPV observer. Sensor fault detection faces the problem of robustness using adaptive thresholds generated with interval observer. Fault isolation is performed using the Euclidean distance between the observed relative residuals and theoretical relative sensitivities. To illustrate the results, a commercial fuel cell Ballard Nexa© is used in simulation where a set of typical fault scenarios have been considered. Finally, the diagnosis results corresponding to those fault scenarios are presented. It is remarkable that with this methodology it is possible to diagnose all the considered faults in contrast with other well known methodologies which use the classic binary signature matrix approach.

  • Observador de estado de un sistema de generación de energía de tipo celda de combustible PEM mediante un modelo lineal variante

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Husar, Attila Peter
    Congreso Nacional de Pilas de Combustible
    Presentation's date: 2010
    Presentation of work at congresses

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    En este trabajo se presenta el modelado de un sistema generador de energía basado en pilas de combustible PEM mediante un modelo variante con el punto de operación (modelo LPV). Dicho modelo ha sido obtenido mediante la linealización del modelo dinámico no lineal que ha sido previamente calibrado con datos reales de laboratorio. El modelo LPV obtenido está pensado para ser utilizado en el diseño de controladores y algoritmos de diagnóstico de fallos basados en modelos.

  • Characterization, development and experimental validation of a dynamic model of an open cathode PEM fuel cell

     Strahl, Stephan; Husar, Attila Peter; Serra Prat, Maria
    Congreso Nacional de Pilas de Combustible
    Presentation's date: 2010
    Presentation of work at congresses

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    Numerical Model for Polymer Electrolyte Membrane Fuel Cells with Experimental Application and Validation  Open access

     Alonso Mora, Javier; Husar, Attila Peter; Serra Prat, Maria; Riera Colomer, Jordi
    Asia-pacific journal of chemical engineering
    Date of publication: 2009
    Journal article

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    The aim of this paper is to present a simple 3D computational model of a Polymer Electrolyte Membrane Fuel Cell (PEMFC) that simulates over time the heat distribution, energy and mass balance of the reactant gas flows in the fuel cell including pressure drop, humidity and liquid water. Although this theoretical model can be adapted to any type of PEMFC, for verification of the model and to present different analysis, it has been adapted to a single cell test fixture. The model parameters were adjusted through a series of experimental tests and the model was experimentally validated for a well defined range of operating conditions: H2/Air as reactants, flow rates of 0.5-1.5 SLPM, dew points and cell temperatures of 30-80ºC, currents 0-5 A and with/without water condensation. The model is especially suited for the analysis of liquid water condensation in the reactant channels. A key finding is that the critical current at which liquid water is formed is determined at different flows, temperatures and humidity.

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    Dynamic water management test station for open-cathode PEMFC systems  Open access

     Husar, Attila Peter; Allué Fantova, Miguel; Cañada Gracia, Marta; Riera Colomer, Jordi
    Iberian Syposium on Hydrogen, Fuel Cells and Advanced Batteries
    Presentation's date: 2009-03-01
    Presentation of work at congresses

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    Linear identification and model adjustment of a PEM fuel cell stack  Open access

     Husar, Attila Peter; Kunusch, Cristian; Puleston, Paul; Mayosky, M.A.; Moré, J
    International journal of hydrogen energy
    Date of publication: 2008
    Journal article

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    In the context of fuel cell stack control a mayor challenge is modeling the interdependence of various complex subsystem dynamics. In many cases, the states interaction is usually modeled through several look-up tables, decision blocks and piecewise continuous functions. Many internal variables are inaccessible for measurement and cannot be used in control algorithms. To make significant contributions in this area, it is necessary to develop reliable models for control and design purposes. In this paper, a linear model based on experimental identification of a 7-cell stack was developed. The procedure followed to obtain a linear model of the system consisted in performing spectroscopy tests of four different single-input single-output subsystems. The considered inputs for the tests were the stack current and the cathode oxygen flow rate, while the measured outputs were the stack voltage and the cathode total pressure. The resulting model can be used either for model-based control design or for on-line analysis and errors detection.

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    Description of gasket failure in a 7 cell PEMFC stack  Open access

     Husar, Attila Peter; Serra Prat, Maria; Kunusch, Cristian
    Journal of power sources
    Date of publication: 2007-01
    Journal article

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    This article presents the data and the description of a fuel cell stack that failed due to gasket degradation. The fuel cell under study is a 7 cell stack. The unexpected change in several variables such as temperature, pressure and voltage indicated the possible failure of the stack. The stack was monitored over a 6 h period in which data was collected and consequently analyzed to conclude that the fuel cell stack failed due to a crossover leak on the anode inlet port located on the cathode side gasket of cell #2. This stack failure analysis revealed a series of indicators that could be used by a supervisional controller in order to initiate a shutdown procedure.

  • Performance of Diagonal Control Structures at Diferent Operating Conditions for Polymer Electrolyte Membrane Fuel Cells

     Serra Prat, Maria; Husar, Attila Peter; Feroldi, Diego; Riera Colomer, Jordi
    Journal of power sources
    Date of publication: 2006-01
    Journal article

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  • Technical Report 1.2

     Serra Prat, Maria; Riera Colomer, Jordi; Husar, Attila Peter; Miguel, Allué
    Date: 2005-09
    Report

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  • Technical report 1.1

     Serra Prat, Maria; Riera Colomer, Jordi; Husar, Attila Peter; Miguel, Allué
    Date: 2005-07
    Report

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  • MAIN CONCLUSIONS OF THE PROJECT

     Serra Prat, Maria; Riera Colomer, Jordi; Husar, Attila Peter; Miguel, Allué
    Date: 2004-11
    Report

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