| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger capable of reducing a weight while keeping high heat exchanging quantity. SOLUTION: As pitches of fine wire fins 14 at a fluid upstream side are larger than those at a fluid downstream side in this heat exchanger 20, the flow of the fluid is made unsteady at an upstream side to enlarge an unsteady area where the heat transfer rate is increased. Further as the pitches of fine wire fins 14 at the fluid downstream side are smaller than those at the fluid upstream side, a heat exchanging face is enlarged at the fluid downstream side in comparison with a case when the pitches of fine wire fins 14 are made to be same as those at the fluid upstream side. Whereby the heat exchanging quantity can be kept high in comparison with a case when the pitches of fine wire fins 14 are unified. As the pitches of fine wire fins 14 at the fluid upstream side is increased in comparison with those of the fluid downstream side, the weight can be reduced in comparison with a case when the pitches of fine wire fins 14 at the fluid upstream side are equal to those at the fluid downstream side. COPYRIGHT: (C)2005,JPO&NCIPI
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