Heat exchanger with flat tubes

A heat exchanger, comprising:

• a plurality of stacked flat tubes, said tubes having facing broad sides adjacent one another in the stacking direction and first and second open ends;
• a collecting tank connected to one of the first and second open ends of said stacked flat tubes, at a connecting plane, the connecting plane defined by a tube plate;
• an internal insert positioned within at least one of said flat tubes, the insert having wave crests and troughs defining flanks therebetween extending in a direction substantially parallel to the flow path of a first medium from the first to the second open end of the at least one tube, the wave crests and troughs of said insert being bonded to said broad sides of said at least one tube, said insert including a corrugation extending in parallel to the flow path along at least one flank from said at least one of the first and second open ends and terminating at a point beyond the connecting plane,
• wherein the at least one flank is continuous along a substantial portion of the flow path between the first and second open ends.

A heat exchanger, comprising:

• a plurality of stacked flat tubes, said tubes having facing broad sides adjacent one another in the stacking direction and first and second open ends;
• an internal insert positioned within at least one of said flat tubes, the insert having wave crests and troughs defining flanks therebetween extending in a direction substantially parallel to a flow path of a first medium between the first and second open ends of the at least one tube, the wave crests and troughs of said insert being bonded to said broad sides of said at least one tube, at least one of the wave flanks including a corrugation extending in parallel to the flow path from the first open end to a termination point between the first and second open ends, said corrugation providing said insert with increased flexibility in the stacking direction in a region from the first open end to the termination point;
• and
• a collecting tank receiving said stacked flat tubes at a connection plane, said connection plane being located in the region of increased flexibility,
• wherein at least one of the flanks is continuous along a substantial portion of the flow path.