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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

# Transient Analysis of Solid Oxide Fuel Cell Hybrids—Part I: Fuel Cell Models

[+] Author and Article Information
Loredana Magistri, Francesco Trasino, Paola Costamagna

Dipartimento di Macchine Sistemi Energetici e Trasporti, Thermochemical Power Group, DiCHEP, Università di Genova, Genova 16145, Italy

J. Eng. Gas Turbines Power 128(2), 288-293 (Mar 01, 2004) (6 pages) doi:10.1115/1.2056529 History: Received October 01, 2003; Revised March 01, 2004

## Abstract

The main goal of this work is the transient analysis of hybrid systems based on solid oxide fuel cells (SOFC). The work is divided into three parts: in the first, the fuel cell transient models are presented and discussed, whereas in the subsequent parts of the paper the anodic recirculation system (Part B: Ferrari, M.L., Traverso, A., Massardo, A.F., 2004, ASME Paper No. 2004-GT-53716) and the entire hybrid transient performance (Part C: Magistri, L., Ferrari, M.L., Traverso, A., Costamagna, P., Massardo, A.F., 2004, ASME Paper No. 2004-GT-53845) are investigated. In this paper the transient behavior of a solid oxide fuel cell is analyzed through the use of two different approaches: macroscopic and detailed SOFC models. Both models are presented in this paper, and their simulation results are compared to each other and to available experimental data. As a first step the transient response of the fuel cell was studied using a very detailed model in order to completely describe this phenomenon and to highlight the critical aspects. Subsequently, some modifications were made to this model to create an apt simulation tool (macroscopic fuel cell model) for the whole plant analysis. The reliability of this model was verified by comparing several transient responses to the results obtained with the detailed model. In the subsequent papers (Parts B and C), the integration of the macroscopic fuel cell model into the whole plant model will be described and the transient study of the hybrid plant will be presented.

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## Figures

Figure 1

Temperature profile due to instantaneous voltage increase obtained with single cell model

Figure 2

Temperature profile due to instantaneous voltage reduction obtained with single cell model

Figure 3

Temperature profile due to instantaneous voltage increase obtained with stack model

Figure 4

Temperature profile due to instantaneous voltage reduction obtained with stack model

Figure 5

Current density distribution due to instantaneous fuel flow-rate decrease

Figure 6

Temperature profiles due to instantaneous fuel flow-rate decrease

Figure 7

Total resistance behavior due to an instantaneous fuel flow-rate decrease

Figure 8

Overpotential profiles due to instantaneous fuel flow-rate decrease

Figure 9

Nernst voltage behavior due to instantaneous fuel flow-rate decrease

Figure 10

Operating voltage profiles due to instantaneous fuel flow-rate decrease

Figure 11

Current density distribution due to instantaneous fuel flow-rate increase

Figure 12

Temperature profiles due to instantaneous fuel flow-rate increase

Figure 13

Total resistance behavior due to an instantaneous fuel flow-rate increase

Figure 14

Overpotential profiles due to instantaneous fuel flow-rate increase

Figure 15

Nernst voltage behavior due to instantaneous fuel flow-rate increase

Figure 16

Operating voltage profiles due to instantaneous fuel flow-rate increase

Figure 17

Operating voltage profiles due to instantaneous fuel flow-rate decrease

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