| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of miniaturization and reducing footprint. <P>SOLUTION: In the heat exchanger 11, a heat transfer tube row unit forming a square shape on the same plane is formed of a plurality of parallel outer tubes 13, at least two inner tubes 15 which are inserted in the outer tubes 13 with opposite ends let out, a primary branch tube 17 connected to the inlet ends of all the inner tubes 15, a secondary branch tube 19 connected to the inlet ends of all the outer tubes 13, through which the inner tubes 15 penetrate, a primary collecting tube 21 connected to the outlet ends of all the inner tubes 15, and a secondary collecting tube 23 connected to the outlet ends of all the outer tubes 13, through which the inner tubes 15 penetrate. The heat exchanger 11 includes a pair of parallel shell end tubes 37 through which the outer tubes 13 penetrate on the inner side of the secondary branch tubes 19 and the secondary collecting tube 23, and a shell 41 of a flattened square tube shape air-tightly covering the outer tubes 13 and having opposite ends connected to and sealed by the pair of shell end tubes 37 and the inside communicating with the insides of the pair of shell end tubes 37. <P>COPYRIGHT: (C)2012,JPO&INPIT |
