Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2004-07-23
2008-12-16
Tsang-Foster, Susy (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S010000, C429S006000, C429S006000
Reexamination Certificate
active
07465508
ABSTRACT:
A temperature control system and method for a fuel cell stack cooling system is disclosed. The temperature control system includes a coolant circulation line for circulating a coolant to and from a fuel cell stack. A coolant pump is provided in the coolant circulation line, and a pump ΔP sensor is provided in fluid communication with the coolant circulation line on inlet and outlet sides of the coolant pump. The pump ΔP sensor measures a change in pump pressure between the inlet and outlet sides of the coolant pump. A pump map is provided having correlated values of pump speed, change in pump pressure and coolant flow rate for correlating the coolant flow rate with the pump speed and the change in pump pressure to attain a desired coolant flow rate for optimum fuel stack cooling.
REFERENCES:
patent: 4582765 (1986-04-01), Kothmann
patent: 2002/0177022 (2002-11-01), Shimonosono et al.
patent: 2003/0175564 (2003-09-01), Mitlitsky et al.
Alp Abdullah B.
Clingerman Bruce J.
Keskula Donald H.
Kolodziej Jason R.
Shaffer Brian D.
Arciero Adam A
General Motors Corporation
Tsang-Foster Susy
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