Read Reduced Modelling of Planar Fuel Cells: Spatial Smoothing and Asymptotic Reduction - Zhongjie He file in PDF
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May 24, 2019 the mathematical model is validated by comparing the numerical results cell voltage, increasing operating temperature, and decreasing cathode flow velocity.
Ansys engineering simulation and 3d design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics.
Minimization of undesirable temperature gradients in all dimensions of a planar solid oxide fuel cell (sofc) is central to the thermal management and commercialization of this electrochemical reactor. This article explores the effective operating variables on the temperature gradient in a multilayer sofc stack and presents a trade-off optimization.
As a subset of the big project in fuel cell research group at curtin university, this thesis mainly focused on presenting different perspectives on multi scale modelling of the planar solid oxide fuel cell (sofc). First of all, a dynamic plug flow reactor (pfr) model of a planar sofc was developed.
A reduced 1d dynamic model of a planar direct internal reforming sofc (dir-sofc) is presented in this paper for system research by introducing two simplifications. The two simplification strategies employed are called integration and average, respectively.
May 13, 2020 fuel cell systems' designs are utilized to reduce the costs of the recent developments in fuel cells technologies and up-to-date modeling for pemfcs, an analytical form for the gas-flow distribution in a plana.
Integrated planar solid oxide fuel cells (ip-sofc) are currently under development for hybrid power applications [1,2]. A typical ip-sofc consists of a flattened ceramic tube with segmented-in-series electrochemical cells deposited on its outer surfaces. This design concept represents a cross between tubular and planar fuel cell designs.
A low-order dynamic model for planar solid oxide fuel cells using online iterative computation high-fidelity dynamic models of solid oxide fuel cells (sofcs) capture the spatial distri-bution of key performance variables by considering the cells as distributed parameter systems.
Performance study of a planar solid oxide fuel cell using a comsol based 2d model and actual cell testing geometry and operating conditions. Proceedings of the asme 2011 9th international conference on fuel cell science, engineering and technology collocated with asme 2011 5th international conference on energy sustainability.
Sofc model the sofc model presented here is used to simulate the mass and energy transport as well as the electrochemical effects that take place in the fuel and air channels, the porous electrodes, the electrolyte and the interconnects of a single cell of a planar sofc.
Improved tank in series model for the planar solid oxide fuel cell.
This book focuses on novel reduced cell and stack models for proton exchange membrane fuel cells (pemfcs) and planar solid oxide fuel cells (p-sofcs) that serve to reduce the computational cost by two orders of magnitude or more with desired numerical accuracy, while capturing both the average properties and the variability of the dependent variables in the 3d counterparts.
The reduced models agree well with the 3d counterpart in view of the quantified loss of information due to reduction, while the computational cost is reduced by more than three orders of magnitude. The present methodology is generic and can be applied to other types of fuel cells which are slender in shape and equipped with parallel channels.
May 20, 2011 thinner electrolytes are expected to reduce the ohmic loss. Numerical three – dimensional model for a planar solid oxide fuel cell (sofc).
The low-order model with 16 states is compared to the baseline model, which has 160 states that incorporates fully the mass and energy balance dynamics. Simulations are performed to evaluate the model performance for both steady-state and transient operations, and to assess the computational cost associated with the low-order and full order models.
Modeling and control of fuel cell systems and fuel processors by jay tawee pukrushpan co-chairs: anna stefanopoulou and huei peng fuel cell systems offer clean and efficient energy production and are currently under intensive develop-ment by several manufacturers for both stationary and mobile applications.
Nov 18, 2010 solid oxide fuel cell (sofc) stacks are at the core of complex and model presented herein could be easily reduced in order to obtain a model suitable although several publications on the dynamic modeling of planar.
In this thesis we construct a series of mathematical models from first principles to examine the advection, diffusion and reactions of species within a planar solid oxide fuel cell (sofc). We reduce the complexity of an sofc to flow and reaction across a flat, impermeable plate and begin by establishing a simplistic model for the incompressible.
In this study, a mathematical model of a co - flow planar anode - supported solid oxide fuel cell with internal reforming of natural gas has been developed. The model simultaneously solves mass, energy transport equations, and chemical as well as electrochemical reactions.
There are simplified fuel cell models from 3d to 2d, but the assumptions on dimensionality tend to lower the fidelity of model prediction. This is the first monograph of its kind, which is dedicated to developing reduced models of planar fuel cells and stacks.
Nov 18, 2011 on the basis of demonstrated high power density (~2 w/cm2 at 650°c) of the state-of-the-art lt-sofc, a 10 cm by 10 cm planar cell.
5 v significant gradients in the electric current were noticed due to a local reduction in hydrogen concentration. The cfd analysis allowed defining desirable mass flow rate of hydrogen to sofcs to avoid fuel starvation.
A performance degradation phenomenon is observed in planar array fuel cells. This effect occurs when multiple cells sharing the same electrolyte membrane are connected in series to build voltage. The open circuit voltage (ocv) and low current behavior of such a series connected planar stack is lower than should be expected.
We analyze a model for the combustion of methane in a planar solid oxide fuel cell. The model includes diffusive and advective transport processes, an electrochemical source of oxygen, and the consumption of oxygen and methane through combustion. The effect of the presence of the reaction products and atmospheric nitrogen is also included.
Abstract: solid oxide fuel cell (sofc) system has been proposed to address carbon monoxide (co) in ppm, can severely poisons anodes and reduce cell performance. This issue is particularly critical for planar sofcs and can severel.
Abstract: this work focuses on a steady-state model developed for an integrated planar solid oxide fuel cell (ip-sofc) bundle. In this geometry, several single ip-sofcs are deposited on a tube and electrically connected in series through interconnections. Then, several tubes are coupled to one another to form a full-sized bundle.
In the planar type of solid oxide fuel cells, the general configuration consists of an interconnect plate, an air/fuel flow field, the pen structure, the alternate air/fuel flow field and an alternate interconnect plate. The interconnect plates within a fuel cell stack are typically fabricated with flow fields on either side, such.
The model is capable of analyzing performance limiting factors for planar solid oxide fuel cell (sofc) stacks. These factors arise from material composition, microstructure, layer thickness, or mic flowfield design. Herein, setup and validation of the modeling framework are presented and discussed in detail.
3d modeling for fuel cells is generally computationally expensive, especially for stacks. In order to reduce computational cost, spatial smoothing over the parallel plain channels in flow fields is introduced and applied to a 3d steady-state isothermal planar solid oxide fuel cell model, which is validated with experiment from literature.
This chapter presents the full sets of equations for two typical kinds of planar fuel cells, including the three-dimensional (3d) two-phase proton exchange membrane fuel cell (pemfc) and 3d planar solid oxide fuel cell (p-sofc), in sects.
Jun 3, 2020 solid oxide fuel cells (sofcs) exhibit potential to become a key tech- under the reducing conditions at the fuel electrode. 24,25 owing to its mixed valence 3 cm2,34 respectively, thus proving the physical validity.
The behavior of an air breathing fuel cell (abfc) operated on dry-hydrogen in dead-ended mode is studied using theoretical analysis. A one-dimensional, non-isothermal, combined heat and mass transport model is developed that captures the coupling between water generation, oxygen consumption, self-heating and natural convection at the air breathing cathode.
High temperatures, however planar fuel cells offer a higher power density when used the cathode is where the oxygen reduction half reaction takes place.
Reversible planar solid oxide fuel-fed electrolysis cells will be developed and validated first in a button-cell level in both the sofec and sofc modes. Anode-supported cell fabrication techniques that have been developed for sofc stacks at msri will be applied to the sofec development.
Solid oxide fuel cells (sofcs) are of great interest due to their high energy efficiency, low emission level, and multiple fuel utilization. Sofc can operate with various kinds of fuels such as natural gas, carbon monoxide, methanol, ethanol, and hydrocarbon compounds, and they are becoming one of the main competitors among environmentally friendly energy sources for the future.
Request pdf reduced modelling of planar fuel cells the fuel cell performance is studied both experimentally and computationally in literature.
Cycling thickness of anode increased, the lifetime of the cell decreased.
Abstract this article discusses various numerical techniques used to model single-cells and stacks of planar solid oxide fuel cells. A brief history of the solid oxide fuel cell (sofc), and a survey of modeling efforts to-date are presented.
The solid oxide fuel cell (sofc) has several advantages compared with both conventional heat engines and low temperature fuel cells like proton exchange.
Jan 22, 2021 in this paper, a numerical model of gas flow, heat transfer, mass multiphysics coupling simulation and parameter study of planar solid oxide fuel cell therefore, the rib width should be reduced as much as possible.
Solid oxide fuel cell (sofc) is an electrochemical equipment that converts gas into electricity directly. The geometry model of computational modeling is a planar radial-type sofc.
A two-dimensional cfd model of a planar solid oxide fuel cell (sofc) has been developed. This model can predict the performance of sofc at various operating and design conditions. The effect of knudsen diffusion is accounted in the porous electrode (backing) and reaction zone layers.
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