System and method of water management in the operation of a fuel cell
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United States of America Patent
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-
Jan 18, 2000
Grant Date -
N/A
app pub date -
May 19, 1998
filing date -
May 19, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A PEM fuel cell system includes a PEM fuel cell that has an input and output port each for fuel or reformate, process air and coolant. A predetermined fraction of volume of moistened exhaust air leaving the air output port of the fuel cell is diverted back and combined with fresh, air at ambient temperature entering the air input port of the PEM fuel cell to maintain water balance in the fuel cell at high ambient operating temperatures. The recycle-to-air vent ratio is controlled by a processor which adjusts the recycle flow based on the ambient temperature and the power level of the fuel cell.
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