| 摘要 |
PURPOSE:To increase the heat transfer area per unit volume of a heat exchanger and consequently promote the heat transfer by a structure wherein wavy projections continuous in the direction of stage are formed on fins at the clearance part in the direction of the stage of heat transfer pipes. CONSTITUTION:The bondaries 8a in the direction of the stage between the planes 6 and 7 of a fin 1 and projections 4 are continuous to the planes 6 and 7 of the fin 1, while the boundaries 8b in the direction of the row are discontinuous to the planes 6 and 7 of the fin 1. When the vertical angle theta2 of the apex 5 of the projection 4 takes 90 deg. and the angle of intersection theta3 of the center line (l) of the plate thickness of the fin 1 and the projection 4 takes 45 deg., the heat transfer area of the fin with the projections 4 is about 1.41 times larger than the heat transfer area of a flat plate fin without the projections 4. In addition, the heat flow from heat transfer pipes flows nearly as indicated with the arrows I and the heat flow toward the projections 4 is scarcely hindered because the boundaries 8a are continuous to the planes 6 and 7 of the fin 1. |
