| 摘要 |
A process for making heat exchanger tubes includes the operating steps of cutting a piece of sheet, subjecting the piece of sheet (3) to a forming step to obtain a plurality of first elements (8, 9) which mirror one another, and bending the piece of sheet (3) to create a tubular element (1) which has two flat walls (4) with the raised elements (8, 9) on them, the flat walls being opposite one another and joined by two connecting walls (5). The first raised elements (8) have an extended shape according to their main direction of extension. The forming step involves making one or more higher second raised elements (9). |
