On Controllability and Observability of Linearized Liquid Water Distributions Inside a PEM Fuel Cell
We analyze the controllability and observability (C/O) of first principles-based numeric and reduced semi-analytic PEMFC models, with emphasis on the effects of model reduction on these analyses. The ...
We analyze the controllability and observability (C/O) of first principles-based numeric and reduced semi-analytic PEMFC models, with emphasis on the effects of model reduction on these analyses. The ...
On Nonlinear Forced Response of Nonuniform Beams
This paper reports the primary resonance of single mode forced, undamped, bending vibration of nonuniform sharp cantilevers of rectangular cross-section, constant width, and convex parabolic thickness...
This paper reports the primary resonance of single mode forced, undamped, bending vibration of nonuniform sharp cantilevers of rectangular cross-section, constant width, and convex parabolic thickness...
Correlating Nitrogen Accumulation With Temporal Fuel Cell Performance
Paper no. DSCC2008-2156 pp. 393-401 (9 pages)
doi:10.1115/DSCC2008-2156
ASME 2008 Dynamic Systems and Control Conference
(DSCC2008)
October 20–22, 2008 , Ann Arbor, Michigan, USA Sponsor: Dynamic Systems and Control Division
October 20–22, 2008 , Ann Arbor, Michigan, USA Sponsor: Dynamic Systems and Control Division
ASME 2008 Dynamic Systems and Control Conference, Parts A and B
ISBN: 978-0-7918-4335-2
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The permeability or crossover characteristics of a typical polymeric perfluorosulfonic acid membrane are used for the temporal and spatial estimation of nitrogen concentration along the anode channels of a fuel cell stack. The predicted nitrogen accumulation is then used to estimate the impact of local fuel starvation on stack voltage through the notion of apparent current density. Despite simplifying assumptions on membrane hydration levels, the calibrated model reasonably predicts the response of a 20-cell stack whenever there is no significant liquid water accumulation in the dead-ended anode. Specifically, the predicted voltage decay and estimated anode outlet gas composition are experimentally validated using stack-averaged voltage and a mass spectrometer. This work shows that the crossover of nitrogen and its accumulation in the anode can cause a considerable stack voltage decay and should be considered under high hydrogen utilization conditions.
©2008 ASME
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