METHOD AND SYSTEM FOR OPERATING FUEL CELL STACKS TO REDUCE NON-STEADY STATE CONDITIONS DURING LOAD TRANSIENTS
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United States of America Patent
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Issued Date -
Feb 26, 2009
app pub date -
Feb 7, 2008
filing date -
Jun 28, 2007
priority date (Note) -
Abandoned
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Abstract
Methods and systems for reducing irregularities in temperature distribution in the operation of a fuel cell stack during a load transient based on the actual stack outlet temperature. In representative embodiments, the coolant flow rate and/or the oxidant stoichiometry is adjusted during a load transient based on a determined value for the same in view on the actual stack outlet temperature. As a result, the fuel cell reaches steady state conditions more quickly, thus reducing periods of non-steady state fuel cell operation.
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