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Performance Enhancement of a Fuel Cell Based Emergency Power System Using Oxygen

Becker, Florian and bleeck, Stefan and Gentner, Christoph and Montaner Rios, Gema and sokolov, Igor and Kallo, Josef (2019) Performance Enhancement of a Fuel Cell Based Emergency Power System Using Oxygen. EFCF 2019, 02.07.2019 - 05.07.2019, Luzern, Schweiz.

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Abstract

The performance of a Polymer Electrolyte Fuel Cell (PEFC) system is influenced by the environmental conditions and its operational parameters. In particular, excess supply of oxygen must be ensured, to avoid inadmissible operating conditions as it determines the efficiency and operational stability of the system. When the PEFC-system is used for emergency power supply (e.g. aircraft safety system), the system reliability is crucial, because it emergency power supply is not a redundant application. The use of additional oxygen contributes to this topic (figure 1). It allows air independent operation. In addition, the cell voltage is increased by the higher oxygen partial pressure, which has a positive effect on efficiency and system performance. Due to the higher efficiency in oxygen operation, the required cooling capacity is reduced. Accordingly, a higher system performance can be achieved without adjusting the cooling system. The oxygen partial pressure can also be increased by the cathodic pressure using a pressure regulator valve. In oxygen operation a higher system performance is achieved by using pressurized oxygen from a tank without using additional electric energy. In air operation, a compressor and a regulator valve are used to increase the system pressure. As a drawback the performance increase is limited, because the electrical power demand of the compressor bounds the overall system performance. Additionally the intake air warms up and may have to be cooled. In an experimental study with a 4 kW PEFC-system the cathodic oxygen partial pressure is varied. It is shown that the system performance is positively affected by increasing the oxygen content compared to operation with a compressor at different pressures. The influence on the best possible operating temperature and the necessary cooling capacity are taken into account. Finally, arising prospects of this concept are discussed.

Item URL in elib:https://elib.dlr.de/128324/
Document Type:Conference or Workshop Item (Speech)
Title:Performance Enhancement of a Fuel Cell Based Emergency Power System Using Oxygen
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Becker, FlorianFlorian.Becker (at) dlr.deUNSPECIFIED
bleeck, StefanStefan.Bleeck (at) dlr.deUNSPECIFIED
Gentner, ChristophChristoph.Gentner (at) dlr.deUNSPECIFIED
Montaner Rios, GemaGema.MontanerRios (at) dlr.deUNSPECIFIED
sokolov, IgorIgor.Sokolov (at) dlr.deUNSPECIFIED
Kallo, JosefJosef.Kallo (at) dlr.deUNSPECIFIED
Date:4 July 2019
Refereed publication:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEM Fuel Cell, Oxygen, Emergency Power, Efficiency
Event Title:EFCF 2019
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:02.07.2019 - 05.07.2019
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Hamburg
Institutes and Institutions:Institute of Engineering Thermodynamics > Energy System Integration
Deposited By: Becker, Florian
Deposited On:12 Jul 2019 13:21
Last Modified:12 Jul 2019 13:21

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