Importance

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Abstract

A heat exchanger includes first flow ducts and adjacent second flow ducts for exchanging heat energy between first flows through the first flow ducts and second flows through the second flow ducts. A parallel flow region where flow passages and directions of the first flows and adjacent flow passages and directions of the second flows are arranged in a parallel relationship with respect to each other at least in a portion of the parallel flow region and are fluidly separated by wall portions. A cross section of the wall portions of the parallel flow region orthogonal to a local flow passage direction of the parallel flow region is a grid-like pattern including a group of m lines spaced from each other and a group of n lines spaced from each other, the m lines and the n lines defining a plurality of points of intersection and a boundary line section between two points of intersection, each boundary line section being part of a boundary line delimiting a cross section of a flow duct of the first and second flow ducts, wherein at least some of the boundary line sections are continuous lines having a positive slope portion and a negative slope portion with respect to a straight line between the two points of intersection.

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First Claim