Patent ID: 7159648

Claim:
A heat exchanger for cooling fluid from a fuel cell, comprising: a longitudinal upper header tank; a longitudinal lower header tank; a longitudinal baffle in said lower header tank defining first and second longitudinal chambers, said baffle including a by-pass hole allowing restricted flow of fluid therethrough; a vacuum break valve between said upper header tank and the environment, said valve blocking pressure release from the upper header tank during operation and allowing an air path between the upper header tank and the environment during draining; a first tube row defined by a first plurality of parallel vertical tubes extending between said upper header tank and said first longitudinal chamber of said lower header tank; a second tube row defined by a second plurality of parallel vertical tubes extending between said upper header tank and said second longitudinal chamber of said lower header tank; a cooling fluid inlet communicating with said first chamber; and a cooling fluid outlet communicating with said second chamber.