Abstract: A header for a flat tube liquefier is composed of first and second components. The first component is provided in a tube bottom with receiving slots for the flat tubes and the second component complements the header structure, with the two components following one another in two overlap zones that extend along the length of the header and seal the two components against each other. A solder connection is provided in the respective overlap zone. If in these two overlap zones the first component is arranged to lie on the outside and the second component on the inside, the first component grips around the second component toward the interior and/or the second component is disposed completely within the outer width dimension of the first component. Moreover, beads may be formed in the tube bottom at both sides of the respective receiving slot at the side of the receiving slot that faces away from the curvature of the tube bottom.

Abstract: A flat tube heat exchanger includes headers (4) and a number of flat tubes (12) between the headers (4), the flat tubes (12) having flat sides (14) and short sides (50) that are rounded. The flat tubes (12) also have internal reinforcing ribs (42). The heat exchanger also includes zigzag fins disposed between the flat sides (14) of the flat tubes (12), the fins being soldered to the flat tubes. The longitudinal extent (1) of a rounded short side (50) of a flat tube (12) is greater than half the distance d between the flat sides (14) of the flat tube (12). Furthermore, the zigzag fins (16) are soldered to portions (58) of both rounded short sides (50) of the flat tube (12). In the process for producing the flat tube heat exchanger (12), the ends of the flat tubes (12) are inserted into slits (8) of a header (4) and are cut free from their reinforcement ribs (42). The ends of the flat tubes (12) are then expanded against the rims of the slits (8) in the header (4).

Abstract: A liquefier for the coolant in a vehicle air-conditioning system equipped with finned heat exchange tubes through which the coolant is conducted in cross-current to the inflowing ambient air. The heat exchange tubes are arranged in several rows of tubes disposed one behind the other in the direction of flow of the incoming ambient air with the respective heat exchange tubes being connected in cross-countercurrent flow. The rows of tubes are subdivided into several component groups (14, 16) which are arranged one behind the other in the direction of flow of the incoming ambient air, with their fin arrangements being decoupled with respect to thermal conduction. The component groups (14, 16) are connected in series with respect to the coolant and in countercurrent to the direction of flow of the incoming ambient air.

Abstract: A rib or fin for the joint ribbing of a plurality of heat exchanger tubes in a ribbed-tube heat exchanger for motor vehicles in which the ambient air flows as a first heat exchange fluid along the surface of the rib or fin and a second heat exchange fluid is conducted in the heat exchanger tubes. The rib is corrugated in the direction of flow of the first fluid. The rib is provided with shaped-on connecting sleeves which serve as a connection to the heat exchanger tubes. At least one wave crest of the corrugation extends between two connecting sleeves that are adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles are shaped in the corrugated surface of the rib in the spaces between the connecting sleeves. The air guidance profiles are constituted by at least predominantly closed bulges which have a lower height than the distance between the ribs when assembled in the heat exchanger and the bulges are each disposed on a slope of the corrugation.