Freeze tolerant fuel cell power plant with a direct contact heat exchanger
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United States of America Patent
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Oct 16, 2007
Grant Date -
May 5, 2005
app pub date -
Dec 31, 2003
filing date -
Nov 5, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A power plant (10) includes at least one fuel cell (12), a coolant loop (18) including a freeze tolerant accumulator (22) for storing and separating a water immiscible fluid and water coolant, a direct contact heat exchanger (56) for mixing the water immiscible fluid and the water coolant within a mixing region (72) of the heat exchanger (56), a coolant pump (21) for circulating the coolant through the coolant loop (18), a radiator loop (84) for circulating the water immiscible fluid through the heat exchanger (56), a radiator (86) for removing heat from the coolant, and a direct contact heat exchanger by-pass system (200). The plant (10) utilizes the water immiscible fluid during steady-state operation to cool the fuel cell and during shut down of the plant to displace water from the fuel cell (12) to the freeze tolerant accumulator (22).
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