Fuel cell system cathode inlet relative humidity control

Details Fuel cell system cathode inlet relative humidity control Fuel cell system cathode inlet relative humidity control

2008-01-25

2010-12-07

Mayes, Melvin C (Department: 1793)

Chemistry: electrical current producing apparatus, product, and

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

Process or means for producing, recycling, or treating...

Reexamination Certificate

active

07846590

ABSTRACT:
A fuel cell system (100) and operational methods (200, 300and400) are described that utilize a combination of sensor input and component models for causing the system's cathode effluent (150) to selectively bypass cathode effluent processing components (140) so as to obtain or maintain a desired cathode inlet relative humidity or dew point. The described system and methods may operate open loop (e.g., without sensor feedback to verify operation) or closed loop (e.g., relying on cathode inlet relative humidity/dew point sensors or fuel cell stack membrane conductivity measures).

REFERENCES:
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patent: 2004/0142218 (2004-07-01), Kusano et al.
patent: 2006/0147773 (2006-07-01), Steinshnider et al.
patent: 2006/0263651 (2006-11-01), Fagley et al.
patent: 2006/0263652 (2006-11-01), Logan
Khan et al, dynamic modeling and simulation of a small wind fuel cell hybrid energy system, 2005, renewable energy, ed. 30, pp. 421-439.
AVR221: discrete PID controller, 2006, ATMEL.

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