Fuel cell system warm-up strategy with reduced efficiency...

Details Fuel cell system warm-up strategy with reduced efficiency... Fuel cell system warm-up strategy with reduced efficiency...

2011-08-30

2011-08-30

Crepeau, Jonathan (Department: 1725)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

C429S433000, C429S442000

Reexamination Certificate

active

08007946

ABSTRACT:
A method for quickly and efficiently heating a fuel cell stack at system start-up. The method uses and prioritizes various stack heat sources based on their efficiency to heat the stack. A thermal set-point for heating the stack to the desired temperature is determined based on the ambient temperature and, the stack cooling fluid temperature. The set-point is then compared-to the stack heating provided by the heat sources that are operating through normal system start-up operation. If more heat is necessary to reach the set-point, the method may first charge a system battery using stack power where the load causes the fuel cell stack to heat up. If additional heating is still required, the method may then turn on a cooling fluid heater, then flow a small amount of hydrogen into the cathode inlet stream to provide combustion, and then increase the compressor load as needed.

REFERENCES:
patent: 2006-114336 (2006-04-01), None

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