| Publication type: | Article in scientific journal |
| Type of review: | Peer review (publication) |
| Title: | Analyzing a micro-solid oxide fuel cell system by global energy balances |
| Authors: | Meier, Christoph Hocker, Thomas Bieberle-Hütter, Anja Gauckler, Ludwig J. |
| DOI: | 10.1016/j.ijhydene.2012.04.009 |
| Published in: | International Journal of Hydrogen Energy |
| Volume(Issue): | 37 |
| Issue: | 13 |
| Page(s): | 10318 |
| Pages to: | 10327 |
| Issue Date: | Jul-2012 |
| Publisher / Ed. Institution: | Elsevier |
| ISSN: | 0360-3199 |
| Language: | English |
| Subjects: | Thermal; Simulation; Management; SOFC |
| Subject (DDC): | 530: Physics 621.3: Electrical, communications, control engineering |
| Abstract: | A simple method to predict the thermal characteristics of a micro-SOFC system is presented in this study. The basic design requirements for a thermally self-sustaining operation at a stack temperature of about 550 °C are assessed. Based on steady-state global energy and mass balances, the influence of the electrical efficiency, the overall air-to-fuel ratio and the heat losses on the operating temperature is discussed. It was found that at high electrical efficiencies and, hence, low heat release rates, a recuperator is needed to achieve the desired operating temperature. At lower electrical efficiencies, in contrast, disposing the released heat becomes an issue and an efficient cooling of the stack is required. Whether a recuperator or additional cooling components are necessary also depends on the electrical power output, the stack size and the thermal insulation specifications. The threshold between cooling and recuperator mode is of special interest, since this operating point allows a simple design of the thermal system without recuperator and only a minimum of air to be supplied to the system. This threshold efficiency, which is the maximal electrical efficiency that allows a thermally self-sustaining operation without recuperator, is above 50% under adiabatic operating conditions. In a non-adiabatic system, the threshold efficiency is reduced to about 45% in a 20 Wel and to about 20% in a 2.5 Wel system even with a state-of-the art thermal insulation. The considered thermal insulations dominate the system volume. Therefore, the ability of heat loss minimization is highly dependent on the targeted volumetric power density of the system. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/1645 |
| Fulltext version: | Published version |
| License (according to publishing contract): | Licence according to publishing contract |
| Departement: | School of Engineering |
| Organisational Unit: | Institute of Computational Physics (ICP) |
| Appears in collections: | Publikationen School of Engineering |
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Meier, C., Hocker, T., Bieberle-Hütter, A., & Gauckler, L. J. (2012). Analyzing a micro-solid oxide fuel cell system by global energy balances. International Journal of Hydrogen Energy, 37(13), 10318–10327. https://doi.org/10.1016/j.ijhydene.2012.04.009
Meier, C. et al. (2012) ‘Analyzing a micro-solid oxide fuel cell system by global energy balances’, International Journal of Hydrogen Energy, 37(13), pp. 10318–10327. Available at: https://doi.org/10.1016/j.ijhydene.2012.04.009.
C. Meier, T. Hocker, A. Bieberle-Hütter, and L. J. Gauckler, “Analyzing a micro-solid oxide fuel cell system by global energy balances,” International Journal of Hydrogen Energy, vol. 37, no. 13, pp. 10318–10327, Jul. 2012, doi: 10.1016/j.ijhydene.2012.04.009.
MEIER, Christoph, Thomas HOCKER, Anja BIEBERLE-HÜTTER und Ludwig J. GAUCKLER, 2012. Analyzing a micro-solid oxide fuel cell system by global energy balances. International Journal of Hydrogen Energy. Juli 2012. Bd. 37, Nr. 13, S. 10318–10327. DOI 10.1016/j.ijhydene.2012.04.009
Meier, Christoph, Thomas Hocker, Anja Bieberle-Hütter, and Ludwig J. Gauckler. 2012. “Analyzing a Micro-Solid Oxide Fuel Cell System by Global Energy Balances.” International Journal of Hydrogen Energy 37 (13): 10318–27. https://doi.org/10.1016/j.ijhydene.2012.04.009.
Meier, Christoph, et al. “Analyzing a Micro-Solid Oxide Fuel Cell System by Global Energy Balances.” International Journal of Hydrogen Energy, vol. 37, no. 13, July 2012, pp. 10318–27, https://doi.org/10.1016/j.ijhydene.2012.04.009.
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