Analytical Modelling Of Fuel Cells

Author: Andrei A Kulikovsky
Editor:
ISBN: 0444642226
File Size: 23,53 MB
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Analytical Modelling of Fuel Cells, Second Edition, is devoted to the analytical models that help us understand the mechanisms of cell operation. The book contains equations for the rapid evaluation of various aspects of fuel cell performance, including cell potential, rate of electrochemical reactions, rate of transport processes in the cell, and temperature fields in the cell, etc. Furthermore, the book discusses how to develop simple physics-based analytical models. A new chapter is devoted to analytical models of PEM fuel cell impedance, a technique that exhibits explosive growth potential. Finally, the book contains Maple worksheets implementing some of the models discussed. Includes simple physics-based equations for the fuel cell polarization curve Provides analytical solutions for fuel cell impedance Includes simple equations for calculation of temperature shapes in fuel cells Introduces physical descriptions of the basic transport and kinetic phenomena in fuel cells of various types

Analytical Modelling Of Fuel Cells

Author: Andrei Kulikovsky
Editor:
ISBN:
File Size: 37,71 MB
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Mechanical Analysis Of Pem Fuel Cell Stack Design

Author: Ahmet Evren Firat
Editor: Cuvillier Verlag
ISBN: 3736992572
File Size: 16,39 MB
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Polymer electrolyte membrane (PEM) fuel cell stack was analyzed from a mechanical point of view with the help of measurements and simulations in this study. The deflection of the fuel cell stack was measured with the help of the experimental set-up under operating conditions. The effects of cell operating parameters and cyclic conditions on the mechanical properties of the fuel cell stack were investigated. In order to extend the mechanical analysis of the fuel cells, two computational models were established containing the geometrical features in detail. A large-scale fuel cell stack model was built for the thermomechanical analysis. The second model was built on a cross-section geometry for the electrochemical analysis including fluid dynamics. The internal stress distribution and buckling of fuel cell stack were examined. The influence of the mechanical compression on the cell performance and squeezing of the gas diffusion layers are investigated. A design procedure is developed for fuel cell stack regarding the durability and performance from a mechanical point of view.

Analytical Fuel Cell Modelling And Exergy Analysis Of Fuel Cells

Author: Franciscus Rudolphus Antonius Maria Standaert
Editor:
ISBN: 9789090123301
File Size: 30,74 MB
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Modeling Solid Oxide Fuel Cells

Author: Roberto Bove
Editor: Springer Science & Business Media
ISBN: 9781402069956
File Size: 16,20 MB
Format: PDF
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This book fills the need for a practical reference for all scientists and graduate students who are seeking to define a mathematical model for Solid Oxide Fuel Cell (SOFC) simulation. Structured in two parts, part one presents the basic theory, and the general equations describing SOFC operation phenomena. Part two deals with the application of the theory to practical examples, where different SOFC geometries, configurations, and different phenomena are analyzed in detail.

Advances In Fuel Cells

Author:
Editor: Elsevier
ISBN: 9780080471006
File Size: 78,23 MB
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Fuel cells have been recognized to be destined to form the cornerstone of energy technologies in the twenty-first century. The rapid advances in fuel cell system development have left current information available only in scattered journals and Internet sites. Advances in Fuel Cells fills the information gap between regularly scheduled journals and university level textbooks by providing in-depth coverage over a broad scope. The present volume provides informative chapters on thermodynamic performance of fuel cells, macroscopic modeling of polymer-electrolyte membranes, the prospects for phosphonated polymers as proton-exchange fuel cell membranes, polymer electrolyte membranes for direct methanol fuel cells, materials for state of the art PEM fuel cells, and their suitability for operation above 100°C, analytical modelling of direct methanol fuel cells, and methanol reforming processes. Includes contributions by leading experts working in both academic and industrial R&D Disseminates the latest research discoveries A valuable resource for senior undergraduates and graduate students, it provides in-depth coverage over a broad scope

Molten Carbonate Fuel Cells

Author: Kai Sundmacher
Editor: John Wiley & Sons
ISBN: 3527611339
File Size: 37,19 MB
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Adopting a unique, integrated engineering approach, this text simultaneously covers all aspects of design and operation, process analysis, optimization, monitoring and control. It clearly presents the multiple advantages of molten carbonate fuel cells for the efficient conversion of energy, and also includes recent developments in this innovative technology. The whole is rounded off by an appendix featuring benchmark problems with equations and parameters. Vital reading for process, chemical and power engineers, as well as those working in power technology, chemists and electrochemists, materials scientists, and energy-supplying companies.

Pem Fuel Cell Engines

Author: Maher Al-Baghdadi
Editor: Createspace Independent Publishing Platform
ISBN: 9781983474996
File Size: 56,88 MB
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PEM Fuel Cell Engines provides a comprehensive and detailed introduction to the fundamental principles of PEM fuel cell science from single cell to stack, so that a reader whether professional or student can gain a timeless understanding of the fundamentals, principles, design, modelling, and analysis. This book provides design and modelling for PEM fuel cell components such as: modelling proton exchange structure, catalyst layers, gas diffusion, fuel distribution structures, and PEM fuel cell stacks. It also provides readers with a fundamental understanding of insufficient fuel cell durability, identification of failure modes and failure mechanisms of PEM fuel cells, fuel cell component degradation modelling, and mitigation strategies against degradation. The book is a useful reference for fuel cell developers and students, researchers in industry entering the area of PEM fuel cells and lecturers teaching fuel cells. The book takes you deeper into the fundamental principles, discussing: - PEM fuel cell thermodynamics, electrochemistry, and performance. - PEM fuel cell components. - PEM fuel cell failure modes. - PEM fuel cell engines design. - PEM fuel cell models based on semi-empirical simulation. - PEM fuel cell models based on computational fluid dynamics. - PEM fuel cell stack models based on solid mechanics-computational fluid dynamics. - Steam reformer unit models based on computational fluid dynamics. - PEM fuel cell analysis. - PEM fuel cell stack analysis.

Fuel Cells

Author: Bei Gou
Editor: CRC Press
ISBN: 9781420071627
File Size: 36,18 MB
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Fuel Cells: Modeling, Control, and Applications describes advanced research results on modeling and control designs for fuel cells and their hybrid energy systems. Filled with simulation examples and test results, it provides detailed discussions on fuel cell modeling, analysis, and nonlinear control. The book begins with an introduction to fuel cells and fuel cell power systems as well as the fundamentals of fuel cell systems and their components. It then presents the linear and nonlinear modeling of fuel cell dynamics, before discussing typical approaches of linear and nonlinear modeling and control design methods for fuel cells. The authors also explore the Simulink implementation of fuel cells, including the modeling of PEM fuel cells and control designs. They cover the applications of fuel cells in vehicles, utility power systems, stand-alone systems, and hybrid renewable energy systems. The book concludes with the modeling and analysis of hybrid renewable energy systems, which integrate fuel cells, wind power, and solar power. Mathematical preliminaries on linear and nonlinear control are provided in an appendix. With the need for alternative power well established, we are seeing unprecedented research in fuel cell technology. Written by scientists directly involved with the research, this book presents approaches and achievements in the linear and nonlinear modeling and control design of PEM fuel cells.

Analytical Fuel Cell Modelling And Exergy Analysis Of Fuel Cells

Author: Franciscus Rudolphus Antonius Maria Standaert
Editor:
ISBN:
File Size: 59,32 MB
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Proton Exchange Membrane Fuel Cells

Author: Alhussein Albarbar
Editor: Springer
ISBN: 3319707272
File Size: 65,46 MB
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This book examines the characteristics of Proton Exchange Membrane (PEM) Fuel Cells with a focus on deriving realistic finite element models. The book also explains in detail how to set up measuring systems, data analysis, and PEM Fuel Cells’ static and dynamic characteristics. Covered in detail are design and operation principles such as polarization phenomenon, thermodynamic analysis, and overall voltage; failure modes and mechanisms such as permanent faults, membrane degradation, and water management; and modelling and numerical simulation including semi-empirical, one-dimensional, two-dimensional, and three-dimensional models. It is appropriate for graduate students, researchers, and engineers who work with the design and reliability of hydrogen fuel cells, in particular proton exchange membrane fuel cells.

An Analytical Control Oriented State Space Model For A Pem Fuel Cell System

Author: Félix Grasser
Editor:
ISBN:
File Size: 24,69 MB
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Analytical Models For Pem Fuel Cell Impedance

Author: Andrei Kulikovsky
Editor:
ISBN: 9781521470749
File Size: 17,83 MB
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The book reports recently developed analytical physics-based models for impedance of a polymer electrolyte membrane fuel cell. Chapter 1 discusses the transient macro-homogeneous model for the cathode catalyst layer. This model forms a basis for all impedance models discussed in this book. Chapter 2 reports solvable analytical impedance models. These models are very fast; the respective numerical algorithms for fitting impedance spectra yield the result in just several minutes on a standard PC. However, the assumptions behind the model equations limit their validity by the cell current density of about a hundred mA cm^{-2}. Chapter 3 presents a more general numerical model valid for the cell currents up to 1 A cm2. However, the fitting algorithm based on this model is rather slow; typical variant takes from one to ten hours on a standard PC. A much faster algorithm can be constructed based on approximate analytical expression for the high--current cell impedance, which concludes this Chapter. The book could be useful to fuel cell developers, researchers and students in the field of fuel cell science. Maple worksheets with codes from this book for fitting experimental impedance spectra can be downloaded from https://github.com/akulikovsky/Fitting_Procs/issues/1

Device And Materials Modeling In Pem Fuel Cells

Author: Stephen J. Paddison
Editor: Springer Science & Business Media
ISBN: 9780387786919
File Size: 40,98 MB
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Computational studies on fuel cell-related issues are increasingly common. These studies range from engineering level models of fuel cell systems and stacks to molecular level, electronic structure calculations on the behavior of membranes and catalysts, and everything in between. This volume explores this range. It is appropriate to ask what, if anything, does this work tell us that we cannot deduce intuitively? Does the emperor have any clothes? In answering this question resolutely in the affirmative, I will also take the liberty to comment a bit on what makes the effort worthwhile to both the perpetrator(s) of the computational study (hereafter I will use the blanket terms modeler and model for both engineering and chemical physics contexts) and to the rest of the world. The requirements of utility are different in the two spheres. As with any activity, there is a range of quality of work within the modeling community. So what constitutes a useful model? What are the best practices, serving both the needs of the promulgator and consumer? Some of the key com- nents are covered below. First, let me provide a word on my ‘credentials’ for such commentary. I have participated in, and sometimes initiated, a c- tinuous series of such efforts devoted to studies of PEMFC components and cells over the past 17 years. All that participation was from the experim- tal, qualitative side of the effort.

Modelling And Process Control Of Fuel Cell Systems

Author: Mohd Azlan Hussain
Editor: MDPI
ISBN: 3036505741
File Size: 69,73 MB
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In this Special Issue, we have several papers related to fuel-cell-based cogeneration systems; the management and control of fuel cell systems; the analysis, simulation, and operation of different types of fuel cells; modelling and online experimental validation; and the environment assessment of cathode materials in lithium-ion battery energy generation systems. A paper which gives a comprehensive review with technical guidelines for the design and operation of fuel cells, especially in a cogeneration system setup, which can be an important source of references for the optimal design and operation of various types of fuel cells in cogeneration systems, can also be found in this Special Issue.

Reduced Modelling Of Planar Fuel Cells

Author: Zhongjie He
Editor: Springer
ISBN: 331942646X
File Size: 46,89 MB
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This book focuses on novel reduced cell and stack models for proton exchange membrane fuel cells (PEMFCs) and planar solid oxide fuel cells (P-SOFCs) that serve to reduce the computational cost by two orders of magnitude or more with desired numerical accuracy, while capturing both the average properties and the variability of the dependent variables in the 3D counterparts. The information provided can also be applied to other kinds of plate-type fuel cells whose flow fields consist of parallel plain channels separated by solid ribs. These fast and efficient models allow statistical sensitivity analysis for a sample size in the order of 1000 without prohibitive computational cost to be performed to investigate not only the individual, but also the simultaneous effects of a group of varying geometrical, material, and operational parameters. This provides important information for cell/stack design, and to illustrate this, Monte Carlo simulation of the reduced P-SOFC model is conducted at both the single-cell and stack levels.

Mathematical And Computational Modeling Of Polymer Exchange Membrane Fuel Cells

Author: Sehribani Ulusoy
Editor:
ISBN:
File Size: 51,21 MB
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In this thesis a comprehensive review of fuel cell modeling has been given and based on the review, a general mathematical fuel cell model has been developed in order to understand the physical phenomena governing the fuel cell behavior and in order to contribute to the efforts investigating the optimum performance at different operating conditions as well as with different physical parameters. The steady state, isothermal model presented here accounts for the combined effects of mass and species transfer, momentum conservation, electrical current distribution through the gas channels, the electrodes and the membrane, and the electrochemical kinetics of the reactions in the anode and cathode catalyst layers. One of the important features of the model is that it proposes a simpler modified pseudo-homogeneous/agglomerate catalyst layer model which takes the advantage of the simplicity of pseudo-homogenous modeling while taking into account the effects of the agglomerates in the catalyst layer by using experimental geometric parameters published. The computation of the general mathematical model can be accomplished in 3D, 2D and 1D with the proper assumptions. Mainly, there are two computational domains considered in this thesis. The first modeling domain is a 2D Membrane Electrode Assembly (MEA) model including the modified agglomerate/pseudo-homogeneous catalyst layer modeling with consistent treatment of water transport in the MEA while the second domain presents a 3D model with different flow filed designs: straight, stepped and tapered. COMSOL Multiphysics along with Batteries and Fuel Cell Module have been used for 2D & 3D model computations while ANSYS FLUENT PEMFC Module has been used for only 3D two-phase computation. Both models have been validated with experimental data. With 2D MEA model, the effects of temperature and water content of the membrane as well as the equivalent weight of the membrane on the performance have been addressed. 3D COMSOL simulation results showed that the fuel performance can be improved by using flow field designs alleviating the reactant depletion along the channels and supplying more uniform reactant distribution. Stepped flow field was found to show better performance when compared to straight and tapered ones. ANSYS FLUENT model is evaluated in terms of predicting the two phase flow in the fuel cell components. It is proposed that it is not capable of predicting the entire fuel cell polarization due to the lack of agglomerate catalyst layer modeling and well-established two-phase flow modeling. Along with the comprehensive modeling efforts, also an analytical model has been computed by using MathCAD and it is found that this simpler model is able to predict the performance in a general trend according to the experimental data obtained for a new novel membrane. Therefore, it can be used for robust prediction of the cell performance at different operating conditions such as temperature and pressure, and the electrochemical properties such as the catalyst loading, the exchange current density and the diffusion coefficients of the reactants. In addition to the modeling efforts, this thesis also presents a very comprehensive literature review on the models developed in the literature so far, the modeling efforts in fuel cell sandwich including membrane, catalyst layer and gas diffusion layer and fuel cell model properties. Moreover, a summary of possible directions of research in fuel cell analysis and computational modeling has been presented.

Control Of Fuel Cell Power Systems

Author: Jay T. Pukrushpan
Editor: Springer Science & Business Media
ISBN: 1447137922
File Size: 11,30 MB
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Presenting the latest research in the control of fuel cell technology, this book will contribute to the commercial viability of the technology. The authors’ background in automotive technology gives the work added authority as a vital element of future planning.

An Analytical Model Of A Novel Microfluidic Proton Exchange Membrane Fuel Cell Device

Author: Dana Barrasso
Editor:
ISBN:
File Size: 75,45 MB
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Dynamic Modeling And Analysis Of Proton Exchange Membrane Fuel Cells For Control Design

Author: Alexander John Headley
Editor:
ISBN:
File Size: 11,84 MB
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This dissertation seeks to address a number of issues facing the advancement of Proton Exchange Membrane (PEM) fuel cell technology by improving control-oriented modeling strategies for these systems. Real-time control is a major ongoing challenge for PEM fuel cell technologies, particularly with regards to water and temperature dynamics. This can lead to a number of operational concerns, such as membrane flooding and dehydration, which can seriously diminish the efficiency, reliability, and long term health of the system. To combat these issues, comprehensive models that are capable of capturing the dynamics of the key operating conditions and can be processed in real time are needed. Also, given the inherently distributed nature of the system, such a model would ideally account for the changes in the conditions from cell-to-cell in the stack, which can be very significant. With this goal in mind, the main focus of this dissertation is the development and experimental validation of control-oriented modeling techniques for PEM fuel cell stacks. The first major work in this study was the verification of a relative humidity model in response to varying loads. Through this work, a multiple control volume (CV) approach was developed and experimentally validated to model the distribution of operating conditions more accurately while keeping the computational expense sufficiently low. To optimize the modeling efforts, further analysis of the temperature and vapor distribution was performed starting from first principles. This led to the creation of various techniques to optimally size CVs based on the parameters and operating conditions of the system in question. Finally, it was noted throughout the testing that the performance of the membrane electrolyte assemblies in the test stack declined significantly from their initial state. To compensate for this, a Kalman filter was implemented to quantify the membrane degradation. SEM analysis of membranes from the test stack confirmed the validity of this technique. This work can be used to significantly improve real-time models for PEM fuel cells for model-based control applications.