Patent ID: 7578340

Claim:
A heat exchanger, comprising: a two-part header, wherein the two-part header comprises a tube plate and a cover meeting at a parting plane, wherein the tube plate and cover are formed substantially symmetrically with respect to the parting plane, with each of the tube plate and cover including at least two approximately semicircular regions that cooperate to form at least two longitudinal passages which are substantially circular in cross section; and a plurality of flat tubes, wherein the tube plate has a plurality of openings for receiving ends of the plurality of flat tubes, wherein each of the tube plate and the cover is produced from a flat metal sheet and has at least one central longitudinal partition region separating each of the at least two approximately semicircular regions, said partition region forming between adjacent tubes at least one transverse passage, and at least one contact surface, wherein the contact surfaces of the tube plate and the cover are brazed together, wherein the tube plate, the cover, and the plurality of flat tubes are brazed together, and wherein the transverse passages are in a form of symmetrically stamped recesses on inner sides of the tube plate and the cover with respect to the parting plane, with corresponding elevations on outer sides of the tube plate and the cover.