Behr Gmbh & Co.

Roland Schirrmacher

Christoph Walter

Walter Wolf

Karl-Heinz Staffa

Hans-Joachim Krauss

Herbert Damsohn

Hagen Mittelstrass

Bernd Dienhart

Werner Helms

Volker Kurz

Roland Hemminger

Dieter Bauer

Ralf Bochert

Herbert Hunzelmann

A multichannel flat tube for a heat exchanger has a plurality of parallel flow channels aligned in a row, side by side, along a transverse axis of the tube. At least the inner flow channels have oval cross-sections, and major semiaxes of the inner flow channels are inclined relative to the transverse axis of the tube at an acute angle. The flat tube can be designed for high operating pressures with relatively low weight and relatively high heat exchange capability. The construction may be used, for example, in CO air conditioners in motor vehicles.

Multi-channel flat tube

A heat exchanger, produced by the insertion of welded pipes into a rib pack, has a good connection between the rib pack and the pipes after expansion of the pipes. An optimal contact of the pipes against the passages in the cooling fins of the rib pack is achieved because the weld base of the welded pipe lies in a recess. The recess is formed by reduction of the wall thickness of a strip material from which the welded pipe is produced.

Heat exchanger having a welded pipe which has a reduced wall thickness

Growing community of inventors

Ludwigsburg, Germany

Roland Schirrmacher