Closed coolant loop with expansion device for a fuel cell system
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United States of America Patent
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Apr 30, 2013
Grant Date -
Oct 16, 2008
app pub date -
Apr 13, 2007
filing date -
Apr 13, 2007
priority date (Note) -
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Abstract
A fuel cell system that employs a closed coolant loop. The system includes an expansion device having a flexible membrane, where a cooling fluid side of the membrane is in fluid communication with the cooling fluid in the coolant loop and an air side of the membrane is in communication with an air pocket. The air side of the expansion device is in air communication with an air compressor so that the pressure of the cooling fluid within the coolant loop changes as the stack pressure changes. The fuel cell system also includes a coolant reservoir that is in fluid communication with the cooling fluid in the coolant loop. Air and hydrogen bubbles within the cooling fluid are vented to the coolant reservoir where they accumulate. The coolant reservoir includes a level sensor indicating the level of the cooling fluid therein.
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