| 摘要 |
PURPOSE: A flat pipe for heating air in an ondol environment is provided to reduce time to heat air since a metal material with excellent conductivity is used and height is low due to a flat pipe. CONSTITUTION: A flat pipe for heating air in an ondol environment is as follows. A circular metal pipe with excellent conductivity is cut to a desired length. The pipe is placed on and under a bending clamp. Through a first bending step(1b) of rotating by 180° and bending, the bending clamp is loosened. After the first bending part rotates in the opposite direction and thus a second bending position is determined, the pip is placed on the bending clamp. The second bending is done by a bending roller. |
