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Fuel Cell Components Library
Rev 9 – November 2009
Copyright © LMS IMAGINE S.A. 1995-2009
AMESim® is the registered trademark of LMS IMAGINE S.A.
AMESet® is the registered trademark of LMS IMAGINE S.A.
AMERun® is the registered trademark of LMS IMAGINE S.A.
AMECustom® is the registered trademark of LMS IMAGINE S.A.
LMS Imagine.Lab is a registered trademark of LMS International N.V.
LMS Virtual.Lab Motion is a registered trademark of LMS International N.V.
ADAMS® is a registered United States trademark of MSC.Software Corporation.
MATLAB and SIMULINK are registered trademarks of the Math Works, Inc.
Modelica is a registered trademark of the Modelica Association.
UNIX is a registered trademark in the United States and other countries exclusively
licensed by X / Open Company Ltd.
Python is a registered trademark of the Python Software Foundation.
Windows is the registered trademark of the Microsoft Corporation.
All other product names are trademarks or registered trademarks of their respective
companies.
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TABLE OF CONTENTS
1. Introduction .......................................................................................................... 1
1.1 Challenges for Fuel Cells Design .................................................................... 1
1.2 Example of Applications .................................................................................. 2
1.3 How to use the Fuel Cell Component library? ................................................. 3
2. Modeling Approach used in this Fuel Cell Component library ........................ 4
2.1. Solution as an Assembly of Generic Libraries ................................................ 4
2.2. Different Scales of modeling of Fuel Cell ....................................................... 7
3. Type of Fuel Cells ................................................................................................ 8
3.1. Limitations ...................................................................................................... 8
3.2. Types of Fuel Cells covered ........................................................................... 8
4. Fuel Cell Principle ................................................................................................ 9
4.1. General Principle ........................................................................................... 9
4.2. P.E.M.F.C. Principle ....................................................................................... 9
4.3. S.O.F.C. Principle .......................................................................................... 10
5. Getting started with the Fuel Cell Component library ....................................... 11
5.1. Construction and parameterization of a first example .................................... 11
5.2. Ports of components in the Fuel Cell Component library ............................... 18
5.3. Philosophy of LMS Imagine.Lab AMESim ...................................................... 20
5.4. Simulation and analysis of the results ............................................................ 22
6. Important Rules to consider with the Fuel Cell library ..................................... 30
6.1. Electrical potential reference requirement ...................................................... 30
6.2. Sign convention for current in stack ............................................................... 30
6.3. Causality assignment by LMS Imagine.Lab AMESim .................................... 31
6.4. Other causality conflicts: algebraic loops ....................................................... 32
6.5. Other important rules ..................................................................................... 33
7. Fuel Cell Components ......................................................................................... 34
7.1. Types of components ..................................................................................... 34
7.2. Stack .............................................................................................................. 37
7.3. Condenser ..................................................................................................... 60
7.4. Humidifier ....................................................................................................... 72
7.5. Tank ............................................................................................................... 83
8. FUEL CELL Systems ............................................................................................ 88
8.1. Complete stack system .................................................................................. 88
8.2. Hybrid vehicle ................................................................................................ 91
9. Conclusion ............................................................................................................ 94
References ................................................................................................................ 95
Glossary .................................................................................................................... 96
Support and contact information ............................................................................ 1
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Using the
Fuel Cell Component library
1. Introduction
The integration of a fuel stack inside a fuel cell system is tricky. Indeed, a fuel cell system contains a
lot of components (the stack, the cooling auxiliaries, the air and hydrogen supply systems, the
electric conversion, the humidification devices...) which are interacting together. On top of that, multi-
physical phenomenon (electricity, heat transfers, fluid flows, electrochemistry...) are involved.
The Fuel Cell Component library in LMS Imagine.Lab AMESim is dedicated to users developing
fuel cells systems. This library enables to have a better understanding of the interactions between
the components and the multi-physic phenomenon of the system. Then, it can be used to design and
optimize the integration of the fuel cell stack inside the system.
Currently, stack models provided by the library are more dedicated to two kinds of fuel cells:
• P.E.M.F.C (= Proton Exchange Membrane Fuel Cell),
• S.O.F.C (= Solid Oxide Fuel Cell),
despite of their own different characteristics (electrochemical reactions at electrodes, side of
production of water...).
However, by using the model of the super-component of a PEMFC, the user can easily modify it in
order to get, for example, the model of an AFC (Alkaline Fuel Cell) or a PAFC (Phosphoric Acid Fuel
Cell).
1.1 Challenges for Fuel Cells Design
What will the future hold for fuel cells and their applications to vehicles? Can all of the control,
driveability, durability and efficiency aspects of their use be balanced against the complexity and
costs of components and subsystems required to support them? For what stationary power
generating applications will fuel cells be practical? If your company is involved with the development
of fuel cells, fuel cell components or fuel cell-powered vehicles and systems, you will be faced with a
multitude of challenges that simulation can help you to address:
• What are the best water management strategies for your fuel cell system?
• What air handling components and system designs will provide optimal system efficiency?
• Will the proposed fuel cell system provide a significant efficiency improvement over other
competing conventional or hybrid vehicle configurations?
• How will the thermal load be managed effectively?
• What is the fuel cell vehicle’s driving range for a given duty cycle?
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The Fuel Cell Component library will help you find solutions to these challenges in future fuel cell
technologies. This library will allow you to solve more of your fuel cell application issues through
modelling and simulation than any other software on the market. You can reduce reliance on
fabrication and laboratory testing and predict performance more quickly and economically.
The model library will be applicable to both stationary and mobile fuel cell applications and will
provide a powerful tool for optimizing fuel cell system performance, efficiency and cost. As the library
is being designed and developed by engineers, the library focuses on the results you want to achieve
in modelling the complex dynamics of fuel cell systems.
Fuel cell stacks performance
Evaluate the impact of system pressures, temperatures, and humidity on fuel cell stack performance.
Determine what level of system complexity is required to achieve the optimal fuel cell performance
for your application.
Vehicle performance
By combining the Fuel Cell Component library with other LMS Imagine.Lab AMESim libraries, you
can quickly construct simulations of complete vehicle arrangements, including a variety of fuel cell
system configurations. Thus, you can use these simulations to determine the effect of fuel cell
components, motor and battery/capacitor size on the performance or range of the vehicle.
Vehicle efficiency
Investigate the trade-offs of various fuel cell configurations. Develop control strategies to provide the
optimal combination of responsiveness and fuel economy. Match compressor, turbine and other fuel
cell subsystem component sizes to minimize wasted energy and extract the most from your system.
Vehicle driveability
Determine what the transient response of the vehicle is to a change in the driver’s demand.
Thermal and water management
Combine the fuel cell simulation with components from other LMS Imagine.Lab AMESim libraries to
build comprehensive simulation models of the complete thermal and water management systems.
Effective thermal and water systems will be critical to the successful mobile application of fuel cells.
1.2 Example of Applications
Investigation of load following vs combined battery/fuel cell powertrains
To make fuel cell powertrains cost competitive, major design decisions such as whether to use load
following or energy storage systems must be carefully examined. The use of a battery allows the fuel
cell to operate in a steady fashion at optimal efficiency. However, the battery adds weight, cost, and
packaging requirements to the vehicle. To assist in evaluating the trade-offs between the battery/fuel
cell and load following systems, dynamic vehicle models can be constructed using the Fuel Cell
Component library.
The models demonstrated that fuel economy savings of 25% could potentially be realized by using
an energy storage system such as a battery. The calculated fuel economy savings can then be
compared with battery costs and packaging to help determine the optimal configuration.
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