Browsing by Author "Strahl, Stephan"
Now showing items 1-20 of 20
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A multi-timescale modeling methodology for PEMFC performance and durability in a virtual fuel cell car
(2015)
Article
Open AccessThe durability of polymer electrolyte membrane fuel cells (PEMFC) is governed by a nonlinear cou-pling between system demand, component behavior, and physicochemical degradation mechanisms, occurring on timescales from the ... -
Characterization, development and experimental validation of a dynamic model of an open cathode PEM fuel cell
(2010)
Conference report
Open AccessWater distribution in a fuel cell affects performance and durability, thus fundamental understanding of water transport mechanisms are imperative and can be strongly influenced through proper control strategies. A ... -
Chattering free sliding mode observer estimation of liquid water fraction in proton exchange membrane fuel cells
(2020-12)
Article
Open AccessThe aim of this work is to deploy and experimentally validate a model-based strategy to estimate unmeasurable variables in a proton exchange membrane (PEM) fuel cell. First, a nonlinear PEM fuel cell dynamical model is ... -
Control de temperatura en pilas de combustible tipo PEM de cátodo abierto
(2014)
Conference report
Restricted access - publisher's policyEn este trabajo se analiza el modelo de una pila de combustible tipo PEM de cátodo abierto. Se caracterizan sus puntos de equilibrio. Se analiza el plano de fase del modelo alrededor de diferentes puntos de operación y se ... -
Development and experimental validation of a dynamic thermal and water distribution model of an open cathode proton exchange membrane fuel cell
(2011)
Article
Open AccessWater concentration in proton exchange membrane (PEM) fuel cells strongly influences performance and durability which demands for fundamental understanding of water transport mechanisms. The system efficiency can be ... -
Electrode structure effects on the performance of open-cathode proton exchange membrane fuel cells: A multiscale modeling approach
(2014-06-15)
Article
Restricted access - publisher's policyIn this paper we present a new dynamic multiscale model of an open-cathode Polymer Electrolyte Membrane Fuel Cell (PEMFC). The model describes two-phase water transport, electrochemistry and thermal management within a ... -
Experimental analysis of a degraded open-cathode PEM fuel cell stack
(2014)
Article
Open AccessThe well-known challenges to overcome in PEM fuel cell research are their relatively low durability and the high costs for the platinum catalysts. This work focuses on degradation mechanisms that are present in open-cathode ... -
Experimental analysis of a degraded open-cathode PEM fuel cell stack
(2013)
Conference report
Open AccessThe 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 ... -
Experimental and model-based analysis for performance and durability improvement of PEM fuel cells
(Universitat Politècnica de Catalunya, 2014-11-07)
Doctoral thesis
Open AccessIncreasing global energy demand, growing carbon emissions and the depletion of fossil fuel sources are some of the most important driving forces for the development of sustainable energy solutions. Proton Exchange Membrane ... -
Experimental characterization and identification of the voltage losses in an open cathode PEM fuel cell stack
(2011)
Conference report
Open AccessFor the past 20 years remarkable progress has been made in PEM fuel cell materials, component design, production, and system power density im-provements. However, there is still a lot to be done in the field of fuel cell ... -
Experimental characterization methodology for the identification of voltage losses of PEMFC: applied to an open cathode stack
(2012)
Article
Open AccessThe objective of this study is to describe the methodology used to isolate the main voltage loss indicators through a simple and effective treatment of a current interrupt and current sweep. The voltage loss indicators are ... -
Experimental study of hydrogen purge effects on performance and efficiency of an open-cathode proton exchange membrane fuel cell system
(2013)
Article
Open AccessThe 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 ... -
Model-based analysis for the thermal management of open-cathode proton exchange membrane fuel cell systems concerning efficiency and stability
(2016-11-01)
Article
Open AccessIn this work we present a dynamic, control-oriented, concentrated parameter model of an open-cathode proton exchange membrane fuel cell system for the study of stability and efficiency improvement with respect to thermal ... -
Performance improvement by temperature control of an open-cathode PEM fuel cell system
(2014-06-01)
Article
Restricted access - publisher's policyThe 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 optimal control ... -
Performance improvement by temperature control of an open-cathode PEM fuel cell system
(2013)
Conference report
Open AccessThe 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 ... -
Study of hydrogen purge effects on performance and efficiency of a PEM fuel cell system
(2012)
Conference report
Open AccessExperimental 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 ... -
Temperature control of open-cathode PEM fuel cells
(2017-07-01)
Article
Open AccessProper temperature control of Proton Exchange Membrane (PEM) Fuel Cells is a crucial factor for optimizing fuel cell performance. A robust temperature controller is required for optimal water management of PEM fuel cells. ... -
Temperature control of open-cathode PEM fuel cells
(2017)
Conference report
Open AccessProper temperature control of Proton Exchange Membrane (PEM) Fuel Cells is a crucial factor for optimizing fuel cell performance. A robust temperature controller is required for optimal water management of PEM fuel cells. ... -
Temperature control of open-cathode PEM fuel cells.
(Elsevier, 2017)
Conference report
Open AccessProper temperature control of Proton Exchange Membrane Fuel Cells is a crucial factor for optimizing fuel cell performance. This paper describes a model-based characterization of the equilibrium points of an open-cathode ... -
Water transport study in high temperature proton exchange membrane fuel cell stack
(2014)
Article
Open AccessA study of water transport in a high temperature phosphoric acid doped polybenzimidazole (PBI) membrane fuel cell stack is reported. Tests with different stoichiometries of dry cathode and different humidity levels of anode ...
