| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger in which corrosion resistance lifetime can be enhanced. SOLUTION: In the heat exchanger, guides are arranged respectively on the left and right sides of a space between tubes adjacent in the stacking direction, where fins 3 are disposed and combustion gas passes through the space sectioned by both guides on the opposite sides. The fin 3, disposed between the tubes, has a lower end extending lower than the lower end (brazed part 4b) of the tube. The majority of condensate generated on the surface of the fin 3 flows downward, as it is, on the surface of the fin 3 and the quantity of condensate flowing to the brazed part 4b side of the tube disposed on the outlet side of combustion gas is reduced. Since a Cu-based brazing material, used at the brazed part 4b of the tube, can be prevented from being corroded through contact with condensate, corrosion resistance can be ensured at the brazed part 4b and corrosion resistance lifetime of the heat exchanger can be enhanced. |
