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Dynamic simulation of PEMFC stack for vehicular applications
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2005 (English)In: Proceedings of the 1st European Fuel Cell Technology and Applications Conference 2005 - Book of Abstracts, 2005, 143-143 p.Conference paper (Refereed)
Abstract [en]

Fuel cells are considered the most versatile and environment friendly power sources to replace conventional internal combustion engines in future urban driving systems. Major automotive industries are carrying out comprehensive R&D programs supported by ample economic resources to develop hydrogen based fuel cells systems that are cheap, reliable with high efficiencies and almost near zero emissions. A number of prototypes are currently under road tests in many cities all over the world. In urban traffics, however, the fuel cells system will be running under dynamic conditions due to the possible variations in vehicular driving modes. Therefore, the objective of this work is to conduct transient analysis of the dynamic behaviour of a fuel cell stack performance under variable operating conditions that simulate the actual driving situations. In this work a dynamic model of a non-isothermal Polymer Electrolyte Membrane (PEM) fuel cell was developed based on the information available in the literature and has been realized in MATLAB/SIMULINK.® environment. The main components of the model are the Membrane Electrode Assembly (MEA) subsystems, thermal and water management subsystems. Main mechanisms involved in fuel cell operations are the electrochemical reactions, gas transport by convection and diffusion, and electrode losses. The input signals selected to excite the fuel cell dynamics are the load current, operating temperature, operating pressure, and hydrogen/oxygen inlet volumetric flows. The transients evolved for main cell outputs such as cell voltage, cell temperature, partial pressures of outlet gases, outlet flow rates, and diffusion flow of hydrogen and oxygen were studied. The results obtained show that sudden changes in current loads have direct impact on cell voltage and outlet gas partial pressures (concentration), and gas mass flows. For the applied current densities, temperature rise was observed. An increase in cell temperature, cell pressure or the hydrogen volumetric flow will lead to an increase in cell voltage and hence in the power output of the cell. Calculations carried out for a 400 fuel cell stack showed a power output of 70 K.W at an efficiency of about 50% (HHV of hydrogen).

Place, publisher, year, edition, pages
2005. 143-143 p.
Keyword [en]
Fuel cell stack, Hydrogen volumetric flow, Membrane Electrode Assembly (MEA) subsystems, Variable operating conditions
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-156569ScopusID: 2-s2.0-33646565295ISBN: 0791842096ISBN: 978-079184209-6OAI: diva2:767302
1st European Fuel Cell Technology and Applications Conference 2005, EFC2005, 14 December 2005 through 16 December 2005, Rome, Italy

QC 20141201

Available from: 2014-12-01 Created: 2014-12-01 Last updated: 2014-12-01Bibliographically approved

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