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(11) | EP 0 030 072 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Heat exchangers and methods of fabricating heat exchangers |
(57) In a heat exchanger including a flat tube (3) made of metal, and corrugated fins
(5) joined by welding to the tube (3), a multiplicity of projections (3A) are successively
formed on one side of the flat tube (3) and arranged in a direction intersecting the
axis of the tube (3). The projections (3A), which may be triangular, arcuate, trapezoidal
or any other suitable shape in cross section, each extend by a distance less than
the thickness of a wall of the tube (3). |