Non-Isothermal and Dynamic SOFC Voltage-Current
                                                Behavior

Gubner, Andreas

doi:10.1149/200507.0814pv

Cited by 10 publications

(6 citation statements)

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“…At FZJ, different SOFC models were developed that are based on the same equations for the physics of an SOFC. Fields of application range from stack design and performance optimization to control strategies for SOFC systems as previously presented at SOFC VIII (1) and SOFC IX (2). Though the SOFC models are based on the same set of equations for the physics, completely different numerical techniques are applied.…”

Section: Discussionmentioning

confidence: 99%

Experiences with a CFD Based Two Stage SOFC Stack Modeling Concept and Its Application

Froning¹,

Blum

Gubner³

et al. 2007

ECS Trans.

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The parallel development of kW-range SOFC stacks and their systems at the Forschungszentrum Jülich requires distinguished modeling capabilities by validated SOFC models targeting the three-dimensional stack structure itself as well as the entire system. For the full three-dimensional (3D) geometric resolution of a stack, Computational Fluid Dynamics (CFD) models are used whereas a one-dimensional (1D) behavior model based on ordinary differential equations (ODE) covers the system modeling requirements. The CFD model is using advanced data structures to reduce the computing time significantly. However, Computing times in the range of seconds or below required by system modeling are featured only by the 1D model. Both SOFC models are based on the same physical equations for electrochemical conversion and internal methane reforming. The application of these models is shown in practice, focusing on choosing the right model for an application, and how both models were validated against each other and against experiments.

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Section: Discussionmentioning

confidence: 99%

Experiences with a CFD Based Two Stage SOFC Stack Modeling Concept and Its Application

Froning¹,

Blum

Gubner³

et al. 2007

ECS Trans.

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“…It is assumed that the anode and cathode outlet flows leave the stack at the thermal mass temperature T stack . Deviating from the previous model description in [20], the electrochemical voltage losses are described in a simplified form using an exponentially temperature dependent area specific resistance (ASR) equation that represents the almost linear current voltage characteristic of electrolyte supported cells [33,42]:…”

Section: Fuel Cell Stackmentioning

confidence: 99%

System Simulation and Analysis of an LNG-Fueled SOFC System Using Additively Manufactured High Temperature Heat Exchangers

Hollmann

Fuchs²,

Spieker³

et al. 2022

Energies

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A laboratory-scale solid oxide fuel cell (SOFC) system using liquefied natural gas (LNG) as a fuel is designed to be used as an energy converter on seagoing vessels (MultiSchIBZ project). The presented system design phase is supported by thermodynamic system simulation. As heat integration plays a crucial role with regard to fuel recirculation and endothermic pre-reforming, the heat exchanger and pre-reforming component models need to exhibit a high degree of accuracy throughout the entire operating range. Compact additively manufactured tube-bundle and plate-fin heat exchangers are designed to achieve high heat exchange efficiencies at low pressure losses. Their heat transfer correlations are derived from experimental component tests under operating conditions. A simulation study utilizing these heat exchanger characteristics is carried out for four configuration variants of pre-reforming and heat integration. Their system behaviour is analyzed with regard to the degree of pre-reforming and the outlet temperature of the fuel processing module. The combination of allothermal pre-reforming with additively manufactured plate-fin heat exchangers exhibits the best heat integration performance at nominal full load and yields a partial load capability to up to 60% electrical load at net electrical efficiencies of 58 to 60% (LHV).

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“…A zero-dimensional SOFC stack model has been developed at VTT in 2004 (3). A onedimensional co-and counter-flow SOFC stack model has been developed by Research Centre Jülich (FZJ) (4,6) and it has been implemented in APROS as a plug-in model in a collaboration project between FZJ, VTT, and Wärtsilä (7).…”

Section: Apros Simulation Softwarementioning

confidence: 99%

Dynamic Simulation Tool APROS in SOFC Power Plant Modeling at Wärtsilä and VTT

Ollikainen¹,

Saarinen²,

Halinen³

et al. 2007

ECS Trans.

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Wärtsilä Corporation is developing SOFC systems for the power ranges of 200 kW and above. Currently the work is focused on a 5 kW test system and a 20 kW prototype unit. Reliable system development requires dynamic simulation, and APROS (Advanced Process Simulation Software) has been chosen as the tool for this work. Development work has been made for modeling fuel cell power plant by preparing modules for SOFC stacks, sulfur removal units, natural gas reformers, catalytic afterburners, and power conditioning systems. The implementation of a zero and one-dimensional SOFC stack model into APROS has been made and the results are under validation. In this contribution, the functionality of modeling these test systems has been studied at the component and system levels. Measurement data is available from both Wärtsilä Corporation and VTT from their own 5 kW test systems that have been running for over 4000 hours.

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Non-Isothermal and Dynamic SOFC Voltage-Current Behavior

Cited by 10 publications

References 0 publications

Experiences with a CFD Based Two Stage SOFC Stack Modeling Concept and Its Application

Experiences with a CFD Based Two Stage SOFC Stack Modeling Concept and Its Application

System Simulation and Analysis of an LNG-Fueled SOFC System Using Additively Manufactured High Temperature Heat Exchangers

Dynamic Simulation Tool APROS in SOFC Power Plant Modeling at Wärtsilä and VTT

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