| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the efficiency of heat exchange by fixing relative positions of inner pipes in the outer pipe. <P>SOLUTION: In a heat exchange duct including flexible inner pipes 2 arranged in an outer pipe 1 and capable of performing heat exchange between a ventilation passage 3 formed between the outer pipe 1 and the inner pipes 2 and inner ventilation passages 4 formed in the inner pipes 2, the inner pipes 2 are arranged around a shaft spacer 5 formed by spirally winding a wire. The inner pipes 2 in the outer pipe 1 are held on predetermined positions by the shaft spacer 5, so that unintentional contact between the inner pipes 2 can be prevented and a large contact area of air flowing into the ventilation passages 3, 4 with the surfaces of the inner pipes 2 can be secured, and thereby excellent thermal efficiency can be obtained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
