Flat heat exchanger tube

A flat heat exchanger tube formed from a single metal strip, comprising:

• two opposite spaced apart broad sides in a thickness direction of said tube and two opposite nose-forming narrow sides in a width direction of said tube;
• wherein the strip has two longitudinal edges, the first longitudinal edge being contiguous to the first broad side and the second longitudinal edge being contiguous to the second broad side;
• said two longitudinal edges of the strip are joined together at a first one of the narrow sides, both longitudinal edges being convex-shaped so that the first edge forms an outer convex bend and the second edge forms an inner convex bend that fits in the outer convex bend and conforms to its internal curvature;
• the second longitudinal edge has a terminal section that is bent to extend across the thickness of the tube to form a closed, edge channel delimited in the width direction by the inner convex bend and by the terminal section;
• wherein the terminal section comprises a leg that extends across the thickness of the tube and a foot that bears against the inner side of the second broad side, the contact surface between the foot and the second broad side being superior to the thickness of the leg, the foot being brazed against the second broad side;
• and the tube comprising only two flow chambers, separated by a fold formed in one of the broad sides and extending in thickness direction to the opposite broad side.