Patent ID: 6453989
Filing Date: 2002-09-24
Classification: F28D,F28F

Abstract:
A heat exchanger comprising:a flat tube constructed by a first wall and a second wall which are arranged opposite and apart in parallel with each other and are assembled together to form a refrigerant passage; and a plurality of columns each having a prescribed sectional shape corresponding to an elliptical shape or an elongated circular shape each defined by a short length d1 and a long length d2, wherein the plurality of columns are arranged between the first and second walls and are arranged to align long lengths thereof along a length direction of the flat tube such that obliquely adjacent columns, which are arranged adjacent to each other obliquely with respect to the length direction of the flat tube, are arranged at different locations but are partly overlapped with each other with long lengths thereof in view of a width direction perpendicular to the length direction of the flat tube, wherein each of the plurality of columns has the prescribed sectional shape which is defined by a relationship of 2.0&leq;d2d1&leq;3.0,â€ƒand wherein using a first center distance p1 being measured between the obliquely adjacent columns in the width direction of the flat tube and a second center distance p2 being measured between the obliquely adjacent columns in the length direction of the flat tube, the plurality of columns are arranged to meet relationships of 1.5&leq;p1d1&leq;3.0&it;â€ƒ&it;and&it;â€ƒ&it;0.5&leq;p2d2&leq;1.5.