초록 ▼

A heat exchanger is provided with a plurality of fins connected in thermal communication with a tube. The tube is shaped to conduct the flow of the first fluid and the fins are arranged to be disposed within a stream of flow of a second fluid. The fins are provided with a plurality of holes, or perf

A heat exchanger is provided with a plurality of fins connected in thermal communication with a tube. The tube is shaped to conduct the flow of the first fluid and the fins are arranged to be disposed within a stream of flow of a second fluid. The fins are provided with a plurality of holes, or perforations, through which the second fluid is directed to flow. The holes through the fins are generally oblong in shape, being somewhat elliptical. The oblong hole has two generally semicircular ends and two connecting long sides, wherein one of the long sides is generally flat and the other long side is provided with a cusp surface which divides the oblong hole into two generally equal portions. The relative position of the cusp surface to the long surface creates counter rotating vortices in the flow of fluid as it passes through the hole. These counter rotating vortex pairs wipe the surface of an adjacent fin when the flow is directed to impinge against a non-perforated portion of that adjacent fin. This wiping action improves the thermal efficiency of the heat exchanger by more effectively increasing the convective heat transfer coefficient on the surface of the fin which is struck by the flow of fluid passing through the oblong hole with the cusp long surface.

대표청구항 ▼

A heat exchanger, comprising: first means for directing a first fluid to flow along a first predefined path; second means for directing a second fluid to flow along a second predefined path; means, associated with said second directing means, for causing said second fluid to form streams comprising

A heat exchanger, comprising: first means for directing a first fluid to flow along a first predefined path; second means for directing a second fluid to flow along a second predefined path; means, associated with said second directing means, for causing said second fluid to form streams comprising pairs of counter rotating vortices; and for directing said streams to flow away from said second directing means and against preselected surfaces of heat exchanger plates. A method of exchanging heat between first and second fluids, comprising: directing a first fluid to flow along a first predefined path; directing a second fluid to flow along a second predefined path; directing said second fluid to form streams comprising pairs of counter rotating vortices, said streams flowing transverse said second predefined path; and directing said first fluid and said streams to flow against preselected surfaces of heat exchanger plates. A finned tube heat exchanger comprising: a tube shaped to contain and direct the flow of a first fluid; a plurality of substantially parallel fins attached in thermal communication with said tube, each of said fins having a plurality of holes extending through the thickness thereof, the holes being coplanar with the fins; said holes being shaped to form counter rotating vortices in a second fluid flowing substantially parallel to said fins and to direct said counter-rotating vortices to strike a surface of an adjacent fin at an angle transverse to the surface of the adjacent fin.