Using a homogeneous model in simulation of sea water desalination condenser

Costa, Paolo; Lodi, G.; Arato, Elisabetta; Maga, L.; Arazzini, S.; Borsani, R.

doi:10.1016/0011-9164(87)90129-9

Cited by 1 publication

(1 citation statement)

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“…A classical method3t4t for the evaluation of the effect of diffusion phenomena on the overall kinetics of a porous catalyst pellet, based on Fick's first law of diffusion, includes calculations of the Thiele modulus and the effectiveness factot As a matter of fact, the effective overall kinetics of a porous catalyst pellet can be calculated, on the basis of the kinetics estimated under conditions of uni-portions underneath the gas channels (diffusion limitations in the direction perpendicular to the cell plane) and to half the rib side in the portions underneath the ribs (inplane diffusion limitations). The kinetic constant k can be estimated on the basis of 'unit at either the anode or the cathode side k = 'unit [13] neFCa where a is the electrode thickness, ne the number of electrons transferred per reacting molecule, and C is the gaseous reactant concentration (hydrogen at the anode and oxygen at the cathode). The equation above is valid under the hypothesis of first-order kinetics in p(O) and p(H20).…”

Section: Mathematical Modelmentioning

confidence: 99%

Modeling of Solid Oxide Heat Exchanger Integrated Stacks and Simulation at High Fuel Utilization

Costamagna

Honegger

1998

J. Electrochem. Soc.

334

171

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This work provides an evaluation of the behavior of a planar circular solid oxide fuel cell stack with an integrated air preheater fed with hydrogen at the anode and air at the cathode under conditions of high fuel utilization. This evaluation is based on a simulation model, whose hypotheses and equations are presented and discussed, together with model validation. Indeed, it has been shown that the simulation results compare favorably with the experimental data of temperature distribution and I-V characteristics at low fuel utilization. Having ascertained the reliability of the model, the simulation results obtained at high fuel utilization are presented and discussed. I-V curves show an almost linear behavior up to fuel utilization factors above 80%. For higher utilizations, the slopes of the curves increase due to an increase of anodic polarization resistance, due to both activation effects and diffusion limitations in the electrode regions underneath the ribs of the gas distributor; on the contrary, diffusion limitations in the regions underneath the gas channels have been demonstrated to be negligible. The results for temperature distributions at high fuel utilization are discussed as well, indicating that the benefit of solid oxide fuel cells with an integrated air preheater, i.e., an almost even distribution of solid temperature on the cell plane, is still valid at high hydrogen utilization factors.

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Section: Mathematical Modelmentioning

confidence: 99%