Importance

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Abstract

The invention is, on the one hand, a heat exchanger comprising at least one tube (1) and at least one ribbing made of a heat conducting material folded to a concertina-like shape, where the ribbing has ribs (2), each of them being substantially perpendicular to the axis (10) of the tube (1) and comprising wings (4A, 4B) and a rib base (3) between them, and where the ribs (2) are attached to the tube (1) at their rib base (3). At least one of said wings (4A, 4B) of each ribs (2) comprises patterns interrupting the continuity of the wing material, and/or bent surfaces making an acute angle (.alpha.) to a plane perpendicular to the axis (10) of the tube (1). The patterns may be cutouts (7A, 7B), holes (8), outpressed parts (9) or embossings (17A, 17B). The invention is, on the other hand, a method of making a heat exchanger comprising forming ribs (2 ) by folding a strip of a heat conducting material to a concertina-like shape and attaching the ribs (2) of the folded material to a tube (1) transversally, where before the folding cutouts (7A, 7B), holes (8) and/or outpressed parts (9) are formed on parts of the strip corresponding to the ribs (2), and/or after having attached the ribs (2) to the tube (1) at least a part of the surface of the ribs (2) is bent as compared to a plane perpendicular to the axis (10) of said tube (1).

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First Claim