Fahruddin, A'rasy (2021) Simulasi dan Eksperimen Modifikasi Desain Flow Field Biometric-Baffle Untuk Meningkatkan Performa Polymer Electrolyte Membrane Fuel Cell (PEMFC). Doctoral thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Flow field pada Polymer Electrolyte Membrane Fuel Cell (PEMFC) merupakan tempat aliran reaktan untuk didistribusikan menuju lapisan difusi. Desain flow field yang baik akan menjamin suplai reaktan di setiap lokasi terjadinya reaksi di lapisan katalis. Suplai reaktan yang baik selain dapat meningkatkan arus listrik yang dihasilkan juga dapat meningkatkan beda potensial sehingga berpengaruh pada efisiensi termodinamik. Pada penelitian ini digunakan desain flow field biometric yang memiliki keunggulan dibanding desain konvesional karena menghasilkan distribusi aliran yang lebih seragam. Penambahan baffle pada saluran akan meningkatkan penetrasi dan transfer massa ke permukaan katalis sehingga diharapkan lebih meningkatkan performa PEMFC yang diteliti.
Penelitian dilakukan dengan simulasi numerik menggunakan software Ansys-Fluent untuk mendapatkan desain terbaik yang kemudian hasilnya divalidasi dengan hasil eksperimen secara langsung. Desain leaf-baffle terbaik didapatkan dari simulasi desain leaf dengan variasi lebar saluran induk dan saluran cabang, serta variasi konfigurasi baffle pada saluran induk dan pada saluran cabang. Desain akhir yang diperbandingkan adalah desain parallel konvensional, desain biometric leaf, dan desain leaf-baffle. Performa terbaik diukur berdasarkan current density dan power density yang dihasilkan serta mempertimbangkan pressure drop.
Dari penelitian yang dilakukan diketahui bahwa penggunaan flow field leaf-baffle dapat meningkatkan performa PEMFC. Hasil eksperimen menunjukkan bahwa penggunaan flow field leaf-baffle dapat meningkatkan current density PEMFC sebesar 28,8% dan 18,98% bila dibanding penggunaan flow field paralel dan leaf, sedangkan power density meningkat sebesar 37,14% dan 24,75%. Desain leaf menghasilkan kecepatan rata-rata reaktan di sisi katoda yang lebih tinggi dibanding parallel. Penambahan baffle pada saluran induk pada flow field leaf meningkatkan distribusi reaktan hingga ujung saluran cabang, meningkatkan tekanan reaktan rata-rata dan konsentrasi oksigen rata-rata pada lapisan difusi. Di sisi lain, peningkatan daya lawan pressure drop pada penambahan baffle relative sangat kecil dibandingkan peningkatan power density yang dihasilkan baik secara numerik maupun eksperimen.
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The flow field in the Polymer Electrolyte Membrane Fuel Cell (PEMFC) is the place where reactants are distributed to the diffusion layer. A good flow field design will guarantee the supply of reactants at each location of the reaction in the catalyst layer. Besides being able to increase the electric current generated, a good supply of reactants can also increase the potential difference so that it affects the thermodynamic efficiency. The biometric flow field design has advantages over conventional design, because it results in a more uniform flow distribution. Adding baffles to the channel will increase penetration and mass transfer to the catalyst surface so that it is expected to further improve PEMFC performance.
The study was conducted with numerical simulations using Ansys-Fluent software to get the best design and the results were validated with true-experimental results. The best leaf-baffle design is obtained from the simulation of leaf designs with variations in the width of the main and branch channels, as well as variations in the configuration of baffles on the main channel and on the branch channel. The final designs being compared are conventional parallel designs, biometric leaf designs, and leaf-baffle designs. The best performance is measured based on the current density and power density produced and taking into account the pressure drop.
From this study it is known that the use of leaf-baffle flow fields can improve PEMFC performance. The experimental results show that the use of leaf-baffle flow fields can increase PEMFC current density by 28.8% and 18.98% when compared to the parallel and leaf flow fields, while the power density increases by 37.14% and 24.75%. The leaf design results in a higher average velocity of the reactants on the cathode side compared to the parallels. The addition of baffles to main channel in the leaf flow field increases the distribution of reactants to the end of the branch channel, increases the average reactant pressure and the average oxygen concentration in the diffusion layer. On the other hand, the increase in pressure drop on the addition of baffles is relatively small compared to the increase in power density generated both numerically and experimentally.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | PEMFC, biometric flow field, baffle, performa, pressure drop, Index Uniformity, baffles, performance, uniformity index. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21001-(S3) PhD Thesis |
| Depositing User: | A'rasy Fahruddin |
| Date Deposited: | 06 Sep 2021 06:50 |
| Last Modified: | 10 Oct 2024 08:31 |
| URI: | http://repository.its.ac.id/id/eprint/91664 |
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