High temperature reactant recycling for PEM fuel cell...

Details High temperature reactant recycling for PEM fuel cell... High temperature reactant recycling for PEM fuel cell...

2006-06-27

2006-06-27

Kalafut, Stephen J. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S006000, C429S006000

Reexamination Certificate

active

07067209

ABSTRACT:
A fuel cell stack has an air inlet manifold (21), an air turnaround manifold (22) and an air exit manifold (23); a coolant inlet is adjacent said air exit manifold; a fuel inlet manifold (16) is connected through a turnaround manifold (17) to a fuel exit manifold (18) remote from said coolant inlet. Fuel recycle is taken from the fuel manifold where the temperature is warmer than it is near the coolant inlet; recycle air for humidifying and heating inlet air is taken from the air turnaround manifold (22), and may either be recycled air provided by a recycle pump (31), or it may utilize an enthalpy recovery device (38) to transfer heat and humidity from an outflow chamber (41) to an inflow chamber (39).

REFERENCES:
patent: 6013385 (2000-01-01), DuBose
patent: 6106964 (2000-08-01), Voss et al.
patent: 6242118 (2001-06-01), Grasso et al.
patent: 6274259 (2001-08-01), Grasso et al.
patent: 6572995 (2003-06-01), Yang et al.

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