Patent ID: 7758823
Filing Date: 2010-07-20
Classification: C10G,F28D,F28F,Y10S

Abstract:
1. A heat exchanger comprising a heat exchanger tube having a longitudinal axis, an interior surface defining the flow area of said tube, an inside diameter and an interior circumference in a plane perpendicular to said longitudinal axis; wherein said interior surface comprises a plurality of axially extending grooves aligned with said longitudinal axis; said grooves formed along the length of said tube and formed as a series of alternating concave and convex surfaces along at least a portion of said interior circumference; and wherein the length of the perimeter of said interior surface in said plane is at least about twenty percent longer than the interior perimeter of a circular tube having substantially the same flow area as said heat exchanger tube, wherein the said heat exchanger is a concentric tube heat exchanger.