Modeling and Simulation of the Dynamic Behavior of Portable Proton Exchange Membrane Fuel Cells.
Published on 22. February 2007
Book
Paperback/Softback
179 pages
978-3-8167-7266-8 (ISBN)
Description
Planar air-breathing fuel cells in printed circuit board technology have been developed as a promising candidate for use in electronic devices. In order to analyze the operational behavior, a mathematical model of planar self-breathing fuel cells is developed and validated. Design guidelines are then derived from the modeling results. One of the major tasks during dynamic operation of proton exchange membrane fuel cells (PEMFCs) is efficient water management. A dynamic and two-phase model of the PEMFC, including a novel membrane model, is developed. Cyclic voltammograms are established as a method to investigate the two-phase transport. Understanding the dynamic behavior of fuel cell stacks is the basis for efficient control of fuel cell systems. A mathematical model of a PEMFC stack for the simulation of arbitrary load profiles is developed and validated. The model is applicable for system simulation and model-based control.
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Content
Benefits of portable fuel cells
Operating principle of the PEMFC
Use of mathematical fuel cell models
Fundamentals of Fuel Cell Modeling
The electrochemical reactions
The equation of continuity
Mass transport of gases
Charge transport
The two-phase flow equations
The energy equation
Modeling Planar Fuel Cells
Literature review of steady-state modelling
Model description
Computational domain
Steady-state model equations
Agglomerate model of the porous cathode
Anodic reaction
Charge transport
Multicomponent mass transport
Heat transport
Numerical solution method
Model validation and model parameters
Operating behaviour of planar fuel cells
Summary of results
Two Phase Dynamic Modeling of the PEMFC
Literature review of dynamic two-phase modelling
Model concept
Experimental setup and model domain
Time-dependent model equations
Electrochemical reactions
Charge transport
Two-phase mass transport
Dynamic two-phase membrane model
Numerical solution of the time dependent PDEs
Discussion of important model parameters
Investigation of cyclic voltammograms
Analysis of the cyclic voltammograms
Characteristic frequencies of water transport
Simulation of low frequency impedance
Conclusion
Dynamic PEMFC Stack Model
Introduction
Model description
Model equations
Energy balance
Mass balance
Electrical model
Membrane model
Discretization and solution method
Parameter identification
Results and discussion
Conclusion and outlook
Summary of Results and Conclusion
Planar self-breathing fuel cells
Two-phase dynamic modelling of PEMFCs
Dynamic fuel cell stack modeling
Operating principle of the PEMFC
Use of mathematical fuel cell models
Fundamentals of Fuel Cell Modeling
The electrochemical reactions
The equation of continuity
Mass transport of gases
Charge transport
The two-phase flow equations
The energy equation
Modeling Planar Fuel Cells
Literature review of steady-state modelling
Model description
Computational domain
Steady-state model equations
Agglomerate model of the porous cathode
Anodic reaction
Charge transport
Multicomponent mass transport
Heat transport
Numerical solution method
Model validation and model parameters
Operating behaviour of planar fuel cells
Summary of results
Two Phase Dynamic Modeling of the PEMFC
Literature review of dynamic two-phase modelling
Model concept
Experimental setup and model domain
Time-dependent model equations
Electrochemical reactions
Charge transport
Two-phase mass transport
Dynamic two-phase membrane model
Numerical solution of the time dependent PDEs
Discussion of important model parameters
Investigation of cyclic voltammograms
Analysis of the cyclic voltammograms
Characteristic frequencies of water transport
Simulation of low frequency impedance
Conclusion
Dynamic PEMFC Stack Model
Introduction
Model description
Model equations
Energy balance
Mass balance
Electrical model
Membrane model
Discretization and solution method
Parameter identification
Results and discussion
Conclusion and outlook
Summary of Results and Conclusion
Planar self-breathing fuel cells
Two-phase dynamic modelling of PEMFCs
Dynamic fuel cell stack modeling