A Physically Based Dynamic Model for Solid Oxide Fuel Cells

2007 ◽  
Vol 22 (4) ◽  
pp. 887-897 ◽  
Author(s):  
Caisheng Wang ◽  
M.H. Nehrir
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Dynamic Model ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Physically Based

scholarly journals Dynamic Model for Understanding Spatial Temperature and Species Distributions in Internal-Reforming Solid Oxide Fuel Cells

2012 ◽  
Vol 9 (4) ◽  
Author(s):  
Brendan Shaffer ◽  
Jacob Brouwer
Keyword(s):  
Fuel Cells ◽  
Temperature Distribution ◽  
Solid Oxide Fuel Cells ◽  
Dynamic Model ◽  
Temperature Difference ◽  
Solid Oxide ◽  
Temperature Gradients ◽  
Cell Performance ◽  
Oxide Fuel ◽  
Temperature Differential

Direct internal reformation of methane in solid oxide fuel cells (SOFCs) leads to two major performance and longevity challenges: thermal stresses in the cell due to large temperature gradients and coke formation on the anode. A simplified quasi-two-dimensional direct internal reformation SOFC (DIR-SOFC) dynamic model was developed for investigation of the effects of various parameters and assumptions on the temperature gradients across the cell. The model consists of 64 nodes, each containing four control volumes: the positive electrode, electrolyte, negative electrode (PEN), interconnect, anode gas, and cathode gas. Within each node the corresponding conservation and chemical and electrochemical reaction rate equations are solved. The model simulates the counter-flow configuration since previous research (Achenbach, 1994, “Three-Dimensional and Time-Dependent Simulation of a Planar Solid Oxide Fuel Cell Stack,” J. Power Sources, 49(1), p. 333) has shown this configuration to yield the smallest temperature differentials for DIR-SOFCs. Steady state simulations revealed several results where the temperature difference across the cell was considerably affected by operating conditions and cell design parameters. Increasing the performance of the cell through modifications to the electrochemical model to simulate modern cell performance produced significant changes in the cell temperature differential. Improved cell performance led to a maximum increase in the temperature differential across the cell of 31 K. An increase in the interconnect thickness from 3.5 to 4.5 mm was shown to reduce the PEN temperature difference about 50 K. Variation of other physical parameters such as the thermal conductivity of the interconnect and the rib width also showed significant effects on the temperature distribution. The sensitivity of temperature distribution to heat losses was also studied, showing a considerable effect near the fuel and air inlets. Increased heat transfer from the cell edges resulted in severe temperature gradients approaching 160 K/cm. The dynamic capability of the spatially resolved dynamic model was also demonstrated for a 45% power increase perturbation while maintaining constant fuel and air utilizations.

scholarly journals Development of a Dynamic Model for Diagnosis and Control of an Integrated Stack Module Based on Solid Oxide Fuel Cells

2017 ◽  
Vol 105 ◽  
pp. 1936-1941 ◽  
Author(s):  
Marco Gallo ◽  
Dario Marra ◽  
Marco Sorrentino ◽  
Cesare Pianese ◽  
Siu Fai Au
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Dynamic Model ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
And Control

A new framework for physically based modeling of solid oxide fuel cells

2007 ◽  
Vol 53 (4) ◽  
pp. 1782-1800 ◽  
Author(s):  
Wolfgang G. Bessler ◽  
Stefan Gewies ◽  
Marcel Vogler
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Physically Based Modeling ◽  
Oxide Fuel ◽  
Physically Based ◽  
New Framework

scholarly journals Dynamic Model for Understanding Spatial Temperature and Species Distributions in Internal-Reforming Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Brendan Shaffer ◽  
Jacob Brouwer
Keyword(s):  
Fuel Cells ◽  
Temperature Distribution ◽  
Solid Oxide Fuel Cells ◽  
Dynamic Model ◽  
Temperature Difference ◽  
Solid Oxide ◽  
Temperature Gradients ◽  
Oxide Fuel ◽  
Temperature Differential ◽  
Cell Temperature

Direct internal reformation of methane in solid oxide fuel cells (SOFCs) leads to two major performance and longevity challenges: thermal stresses in the cell due to large temperature gradients and coke formation on the anode. A simplified quasi-two-dimensional direct internal reformation SOFC (DIR-SOFC) dynamic model was developed for investigation of the effects of various parameters and assumptions on the temperature gradients across the cell. The model consists of 64 nodes each of which contains four control volumes: the positive electrode, electrolyte, negative electrode (PEN); interconnect; anode gas; and cathode gas. Within each node the corresponding conservation, chemical, and electrochemical reaction equations are solved. The model simulates the counterflow configuration since previous research [8] has shown this configuration to yield the smallest temperature differentials. Steady state simulations revealed several results where the temperature difference across the cell was considerably affected by operating and cell design parameters. Increasing the performance of the cell through modifications to the electrochemical model to simulate modern cell performance produced significant changes in the cell temperature differential. Improved cell performance led to a maximum increase in the temperature differential across the cell of 31 K. An increase in the interconnect thickness also exhibits a considerable reduction in the temperature difference across the PEN. In particular, increasing the interconnect thickness from 3.5 to 4.5 mm can achieve about a 50 K reduction in the cross cell temperature difference. Variation of other physical parameters such as the thermal conductivity of the interconnect and the rib width also showed an effect on the temperature distribution. The sensitivity of temperature distribution to the adiabatic assumption was also performed and results showed a considerable effect near the fuel and air inlets. This resulted in severe temperature gradients approaching 160 K/cm.

Effect of an Anode Functional Layer on Cell Performance of Anode-Supported Solid Oxide Fuel Cells by a Decalcomania Method

2013 ◽  
Vol 51 (2) ◽  
pp. 125-130 ◽  
Author(s):  
Sun-Min Park ◽  
Hae-Ran Cho ◽  
Byung-Hyun Choi ◽  
Yong-Tae An ◽  
Ja-Bin Koo ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Cell Performance ◽  
Oxide Fuel ◽  
Functional Layer
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