Passive microcoolant loop for an electrochemical fuel cell

Details Passive microcoolant loop for an electrochemical fuel cell Passive microcoolant loop for an electrochemical fuel cell

2004-12-21

2009-06-16

Cantelmo, Gregg (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

Reexamination Certificate

active

07547482

ABSTRACT:
Improvements in freezing and sub-freezing startup time for an electrochemical fuel cell system may be observed by having a passive coolant microloop using two gear pump heads. During a cold start, a stack valve is initially fully closed and causes all system coolant arriving at the module to run through a driving gear pump head. This causes a driven gear pump head to recirculate coolant inside the module. In an embodiment, the stack valve is a thermostatic valve that begins to open as the coolant begins to warm up. This allows a small bleed of system coolant into the module and decreases the percentage of microloop recirculation. When operating temperature is reached, the thermostatic valve is fully open and system coolant inlet pressure on the driving gear pump head counteracts the pressure on the driven gear pump head, thus stopping recirculation.

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U.S. Appl. No. 60/560,731, filed Feb. 9, 2004, Nelson et al.

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