| 摘要 |
PURPOSE: A dual pipe, capable of smooth heat exchange of first and second fluid which pass through inner pipes, and a manufacturing method thereof are provided to secure simple production process by tightly drawing inner pipes when the drawn inner pipe is inserted into an outer pipe. CONSTITUTION: A dual pipe comprises an inner pipe(100) and an outer pipe(200). The first fluid flows inside the inner pipe. A plurality of ribs(210) is formed in the inner surface of the outer pipe in a radial form. When the outer pipe surrounds the inner pipe, second fluid passes through the ribs from the space between the inner and outer pipes.
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