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Performance and efficiency optimization of PEMFC stacks during operation

Mitzel, Jens und Piela, Piotr (2016) Performance and efficiency optimization of PEMFC stacks during operation. Electrochemistry 2016, 2016-09-26 - 2016-09-28, Mainz, Germany.

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Kurzfassung

The operating conditions essentially determine the performance and the efficiency of a polymer electrolyte membrane fuel cell (PEMFC) stack in a fuel cell system. Due to space and weight limitations in such systems, the optimization of the stack performance and efficiency is mandatory to assure high power output and fuel utilization. Typically, the operating conditions are defined in a system by look-up tables and are not adapted over stack lifetime. But the best operating conditions can vary over the lifetime of a PEMFC stack due to the presence of different degradation phenomena, e.g. resulting in changes of the electrode structure, the electrode hydrophobicity, and the catalyst activity. Predefined look-up tables cannot cover this behavior and the use of an optimization algorithm is highly favorable to facilitate optimal stack operation over the entire lifetime. In the presented work, a new stack efficiency is defined to represent the stack efficiency in a system because the commonly used stack electrical- and fuel efficiencies do not take into account the operating conditions of the examined stack. This efficiency covers all power losses directly connected with the applied conditions including theoretical losses for stack feed stream conditioning, like pressurization and air pumping. Examples will be given which power losses are relevant and dominant for different applications. The performance determining conditions are characterized by the stack temperature as well as the stoichiometric values, the relative humidity, and the pressures of the reactants. Their effect on the stack performance is non-linear and synergistic. A separate optimization of the parameters one after another is not meaningful. Therefore, a direct-search algorithm, the Nelder-Mead simplex, was used for the simultaneous optimization of all parameters. The optimization process will be explained in detail and presented results will demonstrate that the efficiency can be improved in a running PEMFC stack by up to 4 % only by optimizing the operating conditions.

elib-URL des Eintrags:https://elib.dlr.de/108077/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Performance and efficiency optimization of PEMFC stacks during operation
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Mitzel, JensJens.Mitzel (at) dlr.dehttps://orcid.org/0000-0001-8137-9689NICHT SPEZIFIZIERT
Piela, PiotricriNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:26 September 2016
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:PEMFC Stack Efficiency Performance optimization Optimization algorithm Melder-Mead simplex
Veranstaltungstitel:Electrochemistry 2016
Veranstaltungsort:Mainz, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:26 September 2016
Veranstaltungsende:28 September 2016
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Brennstoffzellen
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Brennstoffzellen) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Mitzel, Dr. Jens
Hinterlegt am:22 Nov 2016 09:23
Letzte Änderung:24 Apr 2024 20:13

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