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Compound Fuel Cell Thermodynamic Model for System Simulation

Schröder, Matthias and Gentner, Christoph and Montaner Rios, Gema and Becker, Florian and Bleeck, Stefan and Sokolov, Igor and Kallo, Josef (2019) Compound Fuel Cell Thermodynamic Model for System Simulation. ModVal 2019 – 16th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies, 12.-13. März 2019, Braunschweig, Deutschland.

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Abstract

A simulation model of a fuel cell system is created using a discretized image of the fuel cell membrane and the liquid cooled bipolar plate. Thus it is possible to link processes at cell level (overvoltage, diffusion processes in the membrane) with processes at cell stack level (coolant mass flow, exhaust gas recirculation). The simulation model achieves short computing times and thus enables sensitivity analyses to be performed efficiently for different operating parameters. Coupled heat and mass transfer processes take place in a liquid cooled low-temperature cell stack, while an electrical DC power is produced by the stack. The time-dependent equation systems of the mass and power balances for the fuel cell system are derived and discretized to determine the exact distribution of the waste heat in the outflowing media. As diffusion of water through the membrane is taken into account, the system behaviour of a low-temperature PEM cell stack is finely resolved that the effects of different system configurations and different operating strategies (gas temperature control, gas humidification, exhaust gas recirculation, variable environmental conditions, cold start) can be investigated with sufficient accuracy in a dynamic simulation. As the equation system of the mass balance includes the water diffusion term, the value of the membrane humidity is explicitly calculated as a function of time and coordinate. The modelling approaches are validated with the help of laboratory tests for a fuel cell cold start. A 4 kW fuel cell system with hydrogen and air or with hydrogen and oxygen will be used for validation. Simulation results for different cold start temperatures are presented and compared with the measured values (figure 1).

Item URL in elib:https://elib.dlr.de/128432/
Document Type:Conference or Workshop Item (Poster)
Title:Compound Fuel Cell Thermodynamic Model for System Simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, MatthiasMatthias.Schroeder (at) dlr.deUNSPECIFIED
Gentner, ChristophChristoph.Gentner (at) dlr.deUNSPECIFIED
Montaner Rios, GemaGema.MontanerRios (at) dlr.deUNSPECIFIED
Becker, FlorianFlorian.Becker (at) dlr.deUNSPECIFIED
Bleeck, StefanStefan.Bleeck (at) dlr.deUNSPECIFIED
Sokolov, IgorIgor.Sokolov (at) dlr.deUNSPECIFIED
Kallo, JosefJosef.Kallo (at) dlr.deUNSPECIFIED
Date:March 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:fuel cell, cold start, system simulation
Event Title:ModVal 2019 – 16th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies
Event Location:Braunschweig, Deutschland
Event Type:international Conference
Event Dates:12.-13. März 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: Schröder, Matthias
Deposited On:22 Aug 2019 15:37
Last Modified:22 Aug 2019 15:37

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