Patent ID: 6361431
Filing Date: 2002-03-26
Classification: F24F

Abstract:
A method for ventilating an internal space by rotating air flow, the method comprising:blowing out a jet of internal air within an internal space, the jet having a vertically long rectangular cross section and uniform blowout velocity distribution over the cross section and directed horizontally along a side wall which borders the internal space, wherein the jet is blown out through a blowout elbow provided with at least one guide vane, wherein the at least one guide vane comprises a curved plate and a straight plate connected to the curved plate, wherein the curved plate and the straight plate are disposed to make sub-channels, wherein the sub-channels are defined in shape based on the following formulas: po=h/{[f/f(fâˆ’r)]mâˆ’1}â€ƒâ€ƒ{circle around (1)}an=por[f/(fâˆ’r)]nâ€ƒâ€ƒ{circle around (2)}bn=an/fâ€ƒâ€ƒ{circle around (3)}whereinpo=overhang length at an outlet of the elbow, h=inlet breadth of the elbow, f=enlargement ratio of the elbow (f=W/h), W=outlet breadth of the elbow, m=number of sub-channels (m&gE;2), an=outlet breadth of n-th sub-channel (ao indicates the radius of curvature of an inner side wall of the elbow and am indicates the radius of curvature of an outer side wall of the elbow), r=aspect ratio of the sub-channels, and bn=inlet breadth of n-th sub-channel; and generating a horizontal rotating air flow over the whole internal space as a result of blowing out the jet of internal air, thereby inducing a horizontally circulating air flow and a vertically circulating air flow simultaneously over the whole internal space.