| 摘要 |
A heat exchange pipe has a shell, inner and outer ribbing. The inner ribbing is arranged in screw line with angle of inclination of 0-45° to the pipe axis in thin-wall pipe made of plastic heat-conductive material that is tightly fit in the shell. The outer ribbing is arranged as thin-wall pipe that is tightly fit in the shell, made of heat conductive plastic material, with ribs at outer side. |
