Transient thermal behaviour of a solid oxide fuel cell

Moussa Chnani (1) , Marie-Cécile Péra (1) , Raynal Glises (1) , J.M. Kauffmann (1) , Daniel Hissel (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

A macroscopic model of a short SOFC stack has been developed. The first part of this paper intends to describe a methodology for determining the transient thermal behaviour of the SOFC. A nodal network is used in order to determine the final internal temperatures of the structure. The stack is modelled by one average cell. The cell is divided into several isothermal volumes represented by their central node. The energy balances at each node are developed and solved by Matlab routine. The second part describes a fluidic model in order to compute the partial pressures of chemical species and the output flows. The fluidic model uses electrical/fluidic analogy. Pressure drops in channels are modelled through resistances and the fluid accumulation in the volume is modelled by a capacitor. The next part describes the electrochemical model based on the classical Nernst equation and computation of the overpotential (activation, concentration and ohmic overvoltage). The three submodels are then coupled in order to built a complete modelling of the stack. It has been validated and compared with experimental results on an SOFC stack provided by HTceramix.

Mots clés: Fuel cell; Solid fuel cell; Transient thermal modelling; Fluidic and Electrochemical modelling

Domaines: Energie électrique

Moussa Chnani, Marie-Cécile Péra, Raynal Glises, J.M. Kauffmann, Daniel Hissel. Transient thermal behaviour of a solid oxide fuel cell. The Fifth International Conference on Fuel Cell Science, Engineering and Technology, Jun 2007, New York, United States. pp.28. ⟨hal-00582364⟩