Patent ID: 7080683
Filing Date: 2006-07-25
Classification: F28D,F28F

Abstract:
1. A heat exchanger of the type wherein an upstream to downstream flow of a fluid is directed over its external surface for inducing a transfer of thermal energy between an external fluid and a refrigerant circulating within said heat exchanger, said heat exchanger comprising; a pair of spaced tanks; a pair of slotted headers; a plurality of flow separators within said tanks to induce multiple passes of said refrigerant circulating within said heat exchanger; an inlet tube attached to said one spaced tank; an outlet tube attached to said one spaced tank; a pair of reinforcement plates; a plurality of heat exchange tubes extending between said tanks and in fluid communication therewith; a plurality of flow passages within said tubes having at least one corner having an included angle of less than ninety degrees and formed by a pair of straight or arcuate first side and a second side and wherein said flow passage is of a shape selected from at least one of rectangular with rectangularly or circularly indented corners, triangular with rectangular or circular indentations, circular with rectangular or circular indentations, and elliptical with rectangular or circular indentations; and a plurality of convoluted fins positioned in alternating relation between said tubes constrained by said pair of slotted headers and said pair of reinforcement plates.