| 摘要 |
<p>PROBLEM TO BE SOLVED: To enlarge a heat transfer surface while effectively suppressing peeling of a flow along a wall surface of a heat transfer tube and increase in pressure loss of a fluid, even when a heat exchanger is miniaturized.SOLUTION: A heat exchanger 10 includes: a plurality of flat tubes 11 in which cross sectional outer shape is a symmetrical blade shape; and a tabular fin 13 which comes into contact with each of the flat tubes 11 adjacent to each other. A curvature radius of a tip portion of the cross sectional outer shape on a downstream side is smaller than a curvature radius of a tip portion of the cross sectional outer shape on an upstream side. A raised part 13a is provided at the fin 13, and a cross sectional outer shape of the raised part 13a is a linearly symmetrical cross section. A symmetry axis 13b of the linearly symmetrical cross section is located at an equal distance from the flat tubes 11 adjacent to each other. A tip on the upstream side of the symmetry axis 13b is located on a line L1 connecting portions of maximum width of the flat tubes 11 adjacent to each other, or on the downstream side. A tip on the downstream side of the symmetry axis 13b is located on a line L2 connecting tips on the downstream side of the cross sectional outer shape of the flat tubes 11 adjacent to each other, or on the downstream side. Width vertical to the symmetry axis 13b becomes gradually large from the upstream side toward the downstream side.</p> |
