Radiation heat transfer analysis of the monolith type solid oxide fuel cell

2003 ◽  
Vol 124 (2) ◽  
pp. 453-458 ◽  
Author(s):  
Sunil Murthy ◽  
Andrei G Fedorov
Keyword(s):  
Heat Transfer ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Radiation Heat Transfer ◽  
Solid Oxide ◽  
Heat Transfer Analysis ◽  
Oxide Fuel ◽  
Radiation Heat

Performance Analysis of Solid Oxide Fuel Cell Stack: Part 2 — Radiation Heat Transfer

2007 ◽  
Author(s):  
Vittorio Verda ◽  
Romano Borchiellini
Keyword(s):  
Heat Transfer ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Radiation Heat Transfer ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Radiation Heat ◽  
Fuel Cell Stack ◽  
Direct Exchange ◽  
Single Temperature

Radiation plays an important role in the temperature distribution of high temperature fuel cells and thus on their performance. In this paper, a detailed description of a possible approach for modeling radiation heat transfer in the tubular solid oxide fuel cell stack is provided. Each solid surface is divided into small surfaces, each characterized by a single temperature value. Surfaces are considered as grey bodies. Fuel is considered as a participating medium (grey): it is divided into volumes, each characterized by a temperature value. Radiation between surface and surface, surface and gas, gas and gas is expressed through quantities called the direct exchange areas. Diagrams showing the direct exchange areas for the geometries involved in the CHP100 stack model are presented. In addition, a procedure to obtain these quantities for any geometry is explained.

Modeling on Transport Performance of Integrated-Planar Solid Oxide Fuel Cell

2010 ◽  
Author(s):  
Chao Zhang ◽  
Xiaoze Du ◽  
Lijun Yang ◽  
Yongping Yang ◽  
Yazhen Hao
Keyword(s):  
Heat Transfer ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Knudsen Diffusion ◽  
Solid Oxide ◽  
Chemical Components ◽  
Three Dimension ◽  
Oxide Fuel ◽  
Porous Support ◽  
Polarization Characteristics

The three dimension physico-mathematical model was established for the integrated planar solid oxide fuel cell (IP-SOFC) with the couples of multi components flow of reacting gas, heat transfer and electro-chemical process in order to reveal the inherent multi-scale effect of gas distributing duct and the porous support layer, and also, the microscale effect on the transport process in fuel cell. The mutual influences between heat transfer and chemical components transport were included in the model. In addition, the thermal effect of chemical reactions and its influences on polarizations of fuel cell were considered. And also, besides the Darcy diffusion, the Knudsen diffusion in the sub-microscale structure of the porous support is taken into consideration. Numerical simulation was employed to solve the model, by which, the output performance and polarization characteristics of a single cell were analyzed and compared for electrolyte-supported, anode-supported and cathode-supported SOFC, respectively. The present model was also validated comparing with the experimental data.

Cfd Analysis of Heat Transfer in a Microtubular Solid Oxide Fuel Cell Stack

2014 ◽  
Vol 35 (3) ◽  
pp. 293-304 ◽  
Author(s):  
Paulina Pianko-Oprych ◽  
Ekaterina Kasilova, ◽  
Zdzisław Jaworski
Keyword(s):  
Heat Transfer ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Heat Losses ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Reaction Heat ◽  
Flux Profile ◽  
The Impact

Abstract The aim of this work was to achieve a deeper understanding of the heat transfer in a microtubular Solid Oxide Fuel Cell (mSOFC) stack based on the results obtained by means of a Computational Fluid Dynamics tool. Stack performance predictions were based on simulations for a 16 anodesupported mSOFCs sub-stack, which was a component of the overall stack containing 64 fuel cells. The emphasis of the paper was put on steady-state modelling, which enabled identification of heat transfer between the fuel cells and air flow cooling the stack and estimation of the influence of stack heat losses. Analysis of processes for different heat losses and the impact of the mSOFC reaction heat flux profile on the temperature distribution in the mSOFC stack were carried out. Both radiative and convective heat transfer were taken into account in the analysis. Two different levels of the inlet air velocity and three different values of the heat losses were considered. Good agreement of the CFD model results with experimental data allowed to predict the operation trends, which will be a reliable tool for optimisation of the working setup and ensure sufficient cooling of the mSOFC stack.

Modeling Radiation Heat Transfer With Participating Media in Solid Oxide Fuel Cells

2005 ◽  
Vol 3 (1) ◽  
pp. 62-67 ◽  
Author(s):  
J. D. J. VanderSteen ◽  
J. G. Pharoah
Keyword(s):  
Heat Transfer ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Accurate Determination ◽  
Radiation Heat Transfer ◽  
Transport Processes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Radiation Heat ◽  
Participating Media

Solid oxide fuel cell (SOFC) technology has been shown to be viable, but its profitability has not yet been seen. To achieve a high net efficiency at a low net cost, a detailed understanding of the transport processes both inside and outside of the SOFC stack is required. Of particular significance is an accurate determination of the temperature distribution because material properties, chemical kinetics, and transport properties depend heavily on the temperature. Effective utilization of the heat can lead to a substantial increase in overall system efficiency and decrease in operating cost. Despite the extreme importance in accurately predicting temperature, the SOFC modeling community appears to be uncertain about the importance of incorporating radiation into their models. Although some models have included it, the majority of models ignore radiative heat transfer. SOFCs operate at temperatures around or above 1200 K, where radiation effects can be significant. In order to correctly predict the radiation heat transfer, participating gases must also be included. Water vapor and carbon dioxide can absorb, emit, and scatter radiation, and are present at the anode in high concentrations. This paper presents a simple thermal transport model for analyzing heat transfer and improving thermal management within planar SOFCs. The model was implemented using a commercial computational fluid dynamic code and includes conduction, convection, and radiation in a participating media. It is clear from this study that radiation must be considered when modeling solid oxide fuel cells. The effect of participating media radiation was shown to be minimal in this geometry, but it is likely to be more important in tubular geometries.

Performance of an Integrated Microtubular Fuel Reformer and Solid Oxide Fuel Cell System

2010 ◽  
Vol 7 (3) ◽  
Author(s):  
John R. Izzo ◽  
Aldo A. Peracchio ◽  
Wilson K. S. Chiu
Keyword(s):  
Heat Transfer ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Packed Bed Reactor ◽  
Limiting Current ◽  
Design Parameters ◽  
Heat Of Reaction ◽  
Oxide Fuel ◽  
Flow Rates

A numerical model is developed to study the performance of an integrated tubular fuel reformer and solid oxide fuel cell (SOFC) system. The model is used to study how the physical dimensions of the reformer, gas composition and the species flow rates of a methane feed stream undergoing autothermal reforming (ATR) affect the performance of an SOFC. The temperature in the reformer changes significantly due to the heat of reaction, and the reaction rates are very sensitive to the temperature and species concentrations. Therefore, it is necessary to couple the heat and mass transfer to accurately model the species conversion of the reformate stream. The reactions in the SOFC contribute much less to the temperature distribution than in the reformer and therefore the heat transfer in the SOFC is not necessary to model. A packed bed reactor is used to describe the reformer, where the chemical mechanism and kinetics are taken from the literature for nickel catalyst on a gamma alumina support. Heat transfer in the reformer’s gas and solid catalyst phases are coupled while the gas phase in the SOFC is at a uniform temperature. The SOFC gas species are modeled using a plug flow reactor. The models are in good agreement with experimental data. It is observed that the reformer temperature decreases with an increase in the reformer inlet water-to-fuel ratio and there is a slight decrease in the voltage of the SOFC from higher water content but an increase in limiting current density from a higher hydrogen production. The numerical results show that the flow rates and reformer length are critical design parameters because if not properly designed they can lead to incomplete conversion of the methane fuel to hydrogen in the reformer, which has the greatest impact on the SOFC performance in the integrated ATR reformer and SOFC system.

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