Patent EP-2369287-A2 (EP)
Inventor: SCHROWANGE STEFAN
IPC: F28D9/00
Filed: 2011-03-09
Abstract: The heat exchanger comprises a heat exchanger module, which has a first tube bundle with several tube strands (1a) for the first medium and a second tube bundle with several tube strands (1b) for the second medium, a first collection chamber for the first medium, and a second collection chamber for the second medium, where the first and second collection chambers are arranged at respective head ends of the exchanger module. The tube strands of the first tube bundle flow into a common first inlet-collection chamber (2a) at one head end and into a common first outlet-collection chamber (3a). The heat exchanger comprises a heat exchanger module, which has a first tube bundle with several tube strands (1a) for the first medium and a second tube bundle with several tube strands (1b) for the second medium, a first collection chamber for the first medium, and a second collection chamber for the second medium, where the first and second collection chambers are arranged at respective head ends of the heat exchanger module. The tube strands of the first tube bundle flow into a common first inlet-collection chamber (2a) at one head end and flow into a common first outlet-collection chamber (3a) at its opposite head end. The tube strands of the second tube bundle flow into a common second inlet-collection chamber (2b) or an outlet collection chamber at one head end and flow into a common second outlet-collection chamber or inlet-collection chamber at its opposite head end. The tube strands are formed by metal sheets extending in a module longitudinal direction, where the metal sheets have webs bent along its longitudinal edges. The webs of the one metal sheet are connected to the respective adjacent metal sheet under the formation of the respective tube strands. Some of the metal sheets are formed as separating metal sheets between two adjacent channels. The separating metal sheets area-wise have U-shaped cross-section with U-base separating the two adjacent tube strands from each other and U-shanks forming the bent webs. The separating metal sheets are fabricated from flat metal sheets in one-piece, where the flat metal sheets are bent or folded under the formation of the webs and the U-webs of the separating metal sheets are welded at rear-side with the U-base of the adjacent separating metal sheet in a liquid-tight manner. The heat exchanger module is composed of different separating metal sheets of different types such as separating metal sheets of first metal sheet type and separating metal sheets of second metal sheet type alternatively next to each other. Some metal sheets are formed as cover plates, where the heat exchanger module has two cover plates laterally limiting the module and forming one tube strand respectively with the adjacent separating metal sheet. The cover plates have U-shaped cross-section with U-base and U-shanks, which are welded with the U-base of the adjacent separating metal sheets. The cover plate is formed as flat metal sheet without bends or angles. The separating metal sheets have a middle section separating the tube strands from each other, and an end section forming an opening in the respective collection chamber and connected to the middle section at the end-side. The middle sections have a height defining the height of the tube strand and constant over the total length of the middle section. The end sections have a height tapered towards the metal sheet ends and are formed in a triangular-shaped manner. The separating metal sheets have a bent web at each end sections, where the bent web is welded with the end section of the adjacent separating metal sheet.