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• W383723171 abstract "In this work, a model derived from Non-Equilibrium Thermodynamics, for the Proton Exchange Membrane Fuel Cell, was utilized in order to explore the effect of the assumptions and the transport parameters in the consistency of the model; that is, the compliance of the model with the Second Law of Thermodynamics. This thesis begins with a short overview of the fuel cells as well as an introduction to Non-Equilibrium Thermodynamics. The model utilized is thoroughly depicted, along with all the assumptions made and the parameter set utilized in previous works. In order to numerically evaluate the consistency of the model, the entropy production departure was introduced, which accounts for the difference between the entropy production calculated with Non-Equilibrium Thermodynamics and the entropy production calculated with the entropy flux at the boundaries of each layer of the fuel cell. An optimization scheme was also introduced, where the transport parameters were varied in order to find the minimal entropy production departures, leading to a better consistency of the model with the Second Law of Thermodynamics. It was found that the parameter set utilized by previous publications lead to entropy production departures as high as 80% and, after implementing the optimization scheme, these figures decreased to 22%. A model was introduced to take into account the water transport across the electrodes of the PEMFC. This model was utilized as a replacement for the water equilibrium assumption made in the electrodes, and it was found that the inclusion of this water transport across the electrodes increased the consistency of the PEMFC model with the Second Law of Thermodynamics, calculating entropy departures as low as 8%. Further simulations of the model were carried out, in order to evaluate the effect of the relative humidity of the hydrogen and air streams on the voltage produced by a PEMFC. It was found that low relative humidity of the inlet gases leads to a substantial decrease in the voltage of the fuel cell, with corresponding decreases in the power produced by as much as 67% when operating at high current densities. In this work, a new transport parameter was introduced, namely the electrode water diffusivity, and the optimization scheme was introduced in order to estimate the value of this parameter, in the interval between 2.6x10-3 m/s and 5.8x10-3 m/s." @default.
• W383723171 created "2016-06-24" @default.
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• W383723171 date "2014-06-30" @default.
• W383723171 modified "2023-09-26" @default.
• W383723171 title "Modeling a Proton Exchange Membrane Fuel Cell using Non-Equilibrium Thermodynamics: A Second Law analysis of assumptions and parameters" @default.
• W383723171 hasPublicationYear "2014" @default.
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