A comprehensive fractal approach in determination of the effective thermal conductivity of gas diffusion layers in polymer electrolyte membrane fuel cells
The challenges in the fuel cell industry is to produce the efficient thermal and water management for accurate determination of the effectiveness thermal conductivity of gas diffusion layers (GDL) used in polymer electrolyte membrane fuel cells (PEMFC‟s). This is one of the factors affecting the...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/800/1/24p%20MOHD%20FIKRI%20AZIZAN.pdf http://eprints.uthm.edu.my/800/2/MOHD%20FIKRI%20AZIZAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/800/3/MOHD%20FIKRI%20AZIZAN%20WATERMARK.pdf http://eprints.uthm.edu.my/800/ |
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| Summary: | The challenges in the fuel cell industry is to produce the efficient thermal and water
management for accurate determination of the effectiveness thermal conductivity of
gas diffusion layers (GDL) used in polymer electrolyte membrane fuel cells
(PEMFC‟s). This is one of the factors affecting the durability of a fuel cell and need
to get a solution to minimize costs and optimize the use of electrodes and cells. The
main objectives of this research focus on the capability of the fractal approach for
estimation the effectiveness of thermal conductivity of gas diffusion layer. Moreover,
on this research also to propose modified fractal equations in determination of the
effective thermal conductivity of GDL in PEMFCs based on previous study. Other
objectives in this study are demonstrated the thermal conductivity of GDL treated
with PTFE contents by using through-plane thermal conductivity experiment
method. The through-plane measurement (experiment method) has been used in
estimating through-plane thermal conductivity of the GDL. Thermal resistance for
GDL also has been investigated under compression pressure 0.1 MPa until 1.0 MPa.
In fractal equation, the determination of tortuous and pore fractal dimension can be
done by using Scanning Electron Microscopy (SEM) method. Determination of
effectiveness thermal conductivity using of fractal equation with slightly modified.
In findings, it was found that fractal equation have been modified and measured on
the GDL parameter characteristics. It was shown that the value of the effectiveness
thermal conductivity of the sample using fractal approach is in good agreement with
the experimental value. Finally, all the effective thermal conductivity measured by
experimental and fractal approach have been determined with the variant temperature
and compression pressure to show the validation result between of this two methods. |
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