Folded flat tube with multiple cavities

摘要

The flat tube (1) is made from a sheet (2) and has folded webs (3-5) and a longitudinal seam (6). There are breakthroughs (12) in the webs to improve heat transfer and to create a transverse flow. The breakthroughs should preferably be stamped from the sheet before folding and brought under cover after the folding process.