A control-oriented mathematical model of a polymer electrolyte membrane (PEM) fuel cell stack is developed and experimentally verified. The model predicts the bulk fuel cell transient temperature and voltage as a function of the current drawn and the inlet coolant conditions. The model enables thermal control synthesis and optimization and can be used for estimating the system performance. Unlike other existing thermal models, it includes the gas supply system, which is assumed to be capable of controlling perfectly the excess air and hydrogen ratio. The fuel cell voltage is calculated quasi-statically. Measurement data of a 1.25 kW, 24-cell fuel cell stack with an integrated membrane-type humidification section is used to identify the system parameters and to validate the performance of the simulation model. The predicted thermal response is verified during typical variations in load, coolant flow, and coolant temperature. A first-law control volume analysis is performed to separate the relevant from the negligible contributions to the thermal dynamics and to determine the sensitivity of the energy balance to sensor errors and system parameter deviations.

Volume Subject Area:
Thermodynamic Analysis, Modeling and Simulation in Fuel Cells
Topics:
Dynamics (Mechanics), Modeling, Proton exchange membrane fuel cells, Fuel cells, Coolants, Proton exchange membranes, Temperature, Energy budget (Physics), Errors, Flow (Dynamics), Hydrogen, Membranes, Optimization, Sensors, Simulation models, Stress, Transients (Dynamics)
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Copyright © 2005
 by ASME
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