| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchange efficiency by significantly enhancing heat transfer by vortex flows generated by projection plates of fins.SOLUTION: A gas passage 20A is provided with a plurality of segments 22 partitioned in a direction orthogonal to a gas flowing direction, and the plurality of segments 22 are arranged in a manner of being alternately offset in the direction orthogonal to the gas flowing direction by every prescribed length in the gas flowing direction. Each segment 22 is provided with a first projection plate 25A at an upstream side in the gas flowing direction, and a second projection plate 25B at a downstream side in the gas flowing direction, and the first projection plate 25A and the second projection plate 25B are formed into the polygonal shape of quadrangle or more. A top side 29A of the first projection plate 25A and a top side 29B of the second projection plate 25B are inclined in directions different from each other in a front view from the gas flowing direction, and the first projection plate 25A and the second projection plate 25B respectively produce vortex flows of different rotating directions on rotating axes in the gas flowing direction, from a gas flowing into each segment 22, and two vortex flows from each segment 22 flow into two adjacent segments 22 at the downstream.SELECTED DRAWING: Figure 8 |
