Definition and sensitivity analysis of a finite volume SOFC model for tubular cell geometry.

A finite volume model of a solid oxide fuel cell has been developed. The model applies a detailed electrochemical and thermal analysis
to a tubular SOFC of given geometry, material properties and assigned input flows. Electrochemical modeling includes an evaluation of
ohmic, activation and diffusion losses as well as a kinetic model of hydrocarbon reactions, based on most recent literature experiences.
Internal heat exchange coefficients have been calculated with a specific fluid-dynamic finite volume analysis. The model is calibrated on
the available experimental data for atmospheric and pressurized tubular SOFCs, showing the capacity of predicting accurately the SOFC
operating conditions. The model generates total cell balances and internal cell profiles for any relevant thermodynamic or electrochemical
variable, giving the possibility of discussing the effects of different operating conditions on the internal FC behavior. A sensitivity analysis
is carried out to investigate the effects of different assumptions on a selection of key model parameters involved in the calculation of cell
losses, internal heat exchange process and reforming reactions. Among other results, it is shown that the importance of the adoption of
appropriate parameters for the evaluation of activation polarization, as well as the relevance of a kinetic model for reforming reactions.