Simulação computacional e análise do desempenho de uma célula a combustível unitária do tipo membrana trocadora de prótons no ANSYS Fluent®
One of the most efficient and cleanest way of extracting electrical energy from hydrogen is through proton-exchange membrane fuel cells. Contrary to internal combustion engines, fuel cells do not have their efficiency limited by the Carnot cycle, but by the thermodynamics of the electrochemical reac...
| Autor principal: | Leonel, Elvis Masur Teixeira |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/12071 |
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| Resumo: |
One of the most efficient and cleanest way of extracting electrical energy from hydrogen is through proton-exchange membrane fuel cells. Contrary to internal combustion engines, fuel cells do not have their efficiency limited by the Carnot cycle, but by the thermodynamics of the electrochemical reactions. An efficient way of studying proton-exchange membrane fuel cells is through computer simulations. The study, from these simulations, aggregates knowledge on the behavior of the fuel cell, reduces experimental costs and helps future projects. This document presents the study of a single proton-exchange membrane fuel cell in ANSYS Fluent®. The geometry of the fuel cell was designed in SolidWoks® and imported into ANSYS’ DesignModeler® for the generation of 29 flux channels in each electrode. Following this, two meshes were constructed, where one had about 40% more finite volumes than the other for result comparison. The composition and mass fraction of the inlet gases were calculated for a current density of 1 Acm-2. A constant temperature of 80oC for the whole fuel cell and water phase change were key assumptions. A convergence of 0,01% was required for all monitored variables and residuals. The results, which changed significantly between both meshes, showed large pressure drop, homogeneous distribution of the gas species and little liquid water generation in the flux channels, and deficient humidification of the electrolyte membrane and catalyst layers. It was also possible to generate the polarization plots for both meshes. |
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