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Numerical Analysis of Critical Performance Parameters of the Sulzer Hexis Fuel Cell Stack

Numerical Analysis of Critical Performance Parameters of the Sulzer Hexis Fuel Cell Stack. Pascal Held, Thomas Hocker CCP – Center for Computational Physics ZHW – University of Applied Sciences Winterthur Winterthur, Switzerland Jeannette Frei, Jan Hoffmann Sulzer Hexis Ltd.

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Numerical Analysis of Critical Performance Parameters of the Sulzer Hexis Fuel Cell Stack

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  1. Numerical Analysis of Critical Performance Parameters of the Sulzer Hexis Fuel Cell Stack Pascal Held, Thomas Hocker CCP – Center for Computational Physics ZHW – University of Applied Sciences Winterthur Winterthur, Switzerland Jeannette Frei, Jan Hoffmann Sulzer Hexis Ltd. Winterthur, Switzerland

  2. - Simulation - Software validation - Experimental setup - Hardware development - Program support - GUI development Introduction • 1998 the CCP starts with SOFC simulation • Goal: support of the HEXIS SOFC development with “virtual experiments” • Partners: • The Project is supported by the Swiss Commission for Technology and Innovation (KTI) Fuel Cells - Science and Technology 2004

  3. Contents • Environment • Volume Averaging Method • Model • Sensitivity Analysis • Results Fuel Cells - Science and Technology 2004

  4. Hexis Fuel Cell System Cell Current collector (MIC) SystemHXS 1000 Premiere electrolyte(YSZ-ceramic) Air after burning zone Fuel Stack Fuel Cells - Science and Technology 2004

  5. Volume Averaging Method Effective Parameters Fuel Cells - Science and Technology 2004

  6. Vertical Temperature Gradient Fuel Cells - Science and Technology 2004

  7. Horizontal Temperatur Gradient Fuel Cells - Science and Technology 2004

  8. RepetitiveMIC-Element VAM Applied to SOFC Simulation of Transport Phenomena MIC-Structure Effective Parameters • keff • eff • eff • eff(T,jq,xH2,...) 2D Effective Model: • Reduced Geometric Complexity • Less computational effort Fuel Cells - Science and Technology 2004

  9. Incorporation in 2D-Model Solving 3D with details Comparing 3D with and without details Input: Nubs/element - Sigma - Kappa - Permeability - Diffusion - el. Cond. th. Cond. z-direction th. Cond. x-direction Reaction Database: multi.sfc MIC - Gas Properties - Perm Diffusion Output: effective Parameters for 2D-Model Diffusion nubs Database: reaction.sfc Reaction prop. - Fuel Cells - Science and Technology 2004

  10. Parameter Variation Contact Resistance Different MIC-Designs Manganite RCont,Cath Nubs MIC Direct Hole Original Fuel Cells - Science and Technology 2004

  11. Sensitivity Analysis • Definition: Investigation into how projected performance varies along with changes in the key assumptions on which the projections are based. • Goals: Identify parameters of major importance to a) find out if more accurate measurements required b) concentrate on parameters with optimization potential Fuel Cells - Science and Technology 2004

  12. Procedure • Define upper and lower boundaries for input parameters (input parameters: material properties, geometries, operation condition) • Evaluate output variables for all possible combinations of input parameters • Statistical analysis of output variables Fuel Cells - Science and Technology 2004

  13. Input Variables Example: • Free Volume in Anode/Cathode (Diff_x) • Ion conductivity of Electrolyte (SigmaTKx) • Contact Resistance (Contact_x) DesignEase Screenshot Fuel Cells - Science and Technology 2004

  14. Required Simulations DesignEase Screenshot Follows 2n-law Fuel Cells - Science and Technology 2004

  15. Output Variables • According to optimization goals For example: • Area specific resistance (ASR) • Temperature Fuel Cells - Science and Technology 2004

  16. Results Parameter F (contact resistance cathode) has a major impact on overall performance Fuel Cells - Science and Technology 2004

  17. Further Information CCP-ZHW http://www.ccp.zhwin.ch Sulzer HEXIS Ltd. http://www.hexis.ch NM GmbH http://www.nmtec.ch NMSeses NMSeses (public domain version) with reduced capabilities is available under http://www.nmtec.ch Fuel Cells - Science and Technology 2004

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