Patent ID: 8273488

Claim:
A heat exchanger in a fuel cell system that includes a fuel cell stack, a reformer and a water tank, the heat exchanger comprising: a substrate having a first face and a second face; a first channel arranged in the first face of the substrate, the first channel circulating, cooling and condensing steam discharged only from the fuel cell stack and supplying the circulated cooled and condensed steam to the water tank; a second channel arranged in the second face of the substrate, the second channel circulating and heating water supplied from the water tank and supplying the circulated and heated water to the reformer; a first cover plate arranged on the first face of the substrate; and a second cover plate arranged on the second face of the substrate, wherein each of the first and second channels has a serpentine pattern comprised of a plurality of interconnected stripes, wherein stripes of the first channel are parallel to stripes of the second channel.