Heat exchanger

Abstract

Wave-like concaves/convexes are formed on respective flat surfaces of a heat exchange tube, such that crest lines of continuing V shapes in a horizontal direction and trough lines of continuing V shapes in the horizontal direction are alternately arranged and that bends of the V shapes form curve lines. This configuration reduces the stress concentration at the bends in a press-forming process, compared with a configuration that crest lines and trough lines have bends formed in a shape of continuing sharply-angled V shapes in the horizontal direction. As a result, this configuration increases the yield in the press-forming process at a fixed amplitude of the wave-like concaves/convexes and increases the amplitude of the wave-like concaves/convexes at a fixed yield in the press-forming process.

1 . A heat exchanger configured to perform heat exchange by flowing a fluid on a surface of a heat transfer member,
 the heat transfer member comprising wave-like concaves/convexes of smooth curve lines provided on the surface exposed to the fluid, wherein the wave-like concaves/convexes are formed such that crest lines of continuing crests of wave and trough lines of continuing troughs of wave are formed in a shape of continuing V shapes in a horizontal direction, that bends of the V shapes form curve lines, and that a main flow of the fluid flows in a direction perpendicular to the V shapes.   
     
     
         2 . The heat exchanger according to  claim 1 ,
 wherein the crest line and the trough line are formed by alternately arranging linear portions and arc portions in a continuous manner.   
     
     
         3 . The heat exchanger according to  claim 2 ,
 wherein the arc portion has a radius that is equal to or larger than one fifth a length of the linear portion.   
     
     
         4 . The heat exchanger according to  claim 1 ,
 wherein the wave-like concaves/convexes are formed by alternately arranging straight lines and arcs in a continuous manner in cross section.   
     
     
         5 . The heat exchanger according to  claim 1 ,
 wherein the heat transfer member is a heat exchange tube formed as a flat hollow pipe, and   the wave-like concaves/convexes are formed on a flat surface of the heat exchange tube.   
     
     
         6 . The heat exchanger according to  claim 1 ,
 wherein the heat transfer member is a fin coupled with a heat exchange tube.