Heat exchange – Tubular structure – With discrete heat transfer means
Patent
1985-12-31
1987-03-10
Cline, William R.
Heat exchange
Tubular structure
With discrete heat transfer means
165183, F28F 130
Patent
active
046484434
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The subject matter of the invention is a heat exchanger comprising at least one tube and at least one ribbing made of a heat conducting material folded to a concertina-like shape, where the ribbing folds have ribs, each of them being substantially perpendicular to the axis of the tube and comprising wings and a rib base between them, and where the ribs are attached to the tube at their rib base.
BACKGROUND OF THE INVENTION
There is a known heat exchanger comprising a tube and a wire ribbing attached to it, in which the wire after expedient deformation is folded to a concertina-like shape, and then attached to the mantle of the tube along one of its generatrices by a permanent joint, e.g. welding or soldering. Such a heat exchanger is described in the Hungarian Pat. No. 153,573.
A lamellar cooling ribbing is known furthermore from the Hungarian Pat. No. 144,706, where a metal strip folded in a zigzag shape is inserted between two cooling tubes, and where the metal strip constitutes the cooling ribbing.
In both of the above mentioned devices the ribs are of a continuous material and their surfaces stand in the direction of flow of the medium streaming at a right angle to the tube axis. Heat exchangers of this type have the advantage that their production can easily be automated, and that they can be produced in a welded construction as well, i.e. they can be used even in cases of high temperature.
OBJECT OF THE INVENTION
The object of the present invention is to provide a novel heat exchanger of the aforedescribed type with improved heat engineering characteristics without making its production essentially more complicated or expensive.
SUMMARY OF THE INVENTION
The invention is based on the discovery that patterns interrupting the continuity of the material (e.g. discontinuities such as cutouts, outpressed parts or embossings) applied on parts of the folded heat conducting material (e.g. metal strip) constituting the ribs and/or bends result in an essential improvement of the heat-transfer characteristics of the heat exchanger. In order to make these patterns or bendings only an insignificant enlargement or modification of the production line producing ribbed heat exchangers is needed.
Thus the invention is a heat exchanger comprising at least one tube and at least one ribbing made of a heat conducting material folded to a concertina-like shape, where said ribbing has ribs each of them being substantially perpendicular to the axis of said tube and comprising wings and a rib base between them and where said ribs are attached to said tube at their rib base. According to the invention at least one of said wings of each ribs comprises patterns interrupting the continuity of the wing material and/or bent surfaces making an acute angle to a plane perpendicular to the axis of said tube. The heat conducting material folded to a concertina-like shape is preferably a metal strip, but can also be e.g. a deformed wire on which sections of a cross-section corresponding to ribs are formed.
In an advantageous embodiment of the heat exchanger according to the invention each of said ribs has at the end of its wings connecting parts, each of them joined to an adjacent rib and at least one of said connecting parts is twisted at an acute angle as compared to the rib base. According to a further embodiment, both connecting parts are twisted at an acute angle of same magnitude but of opposite direction with respect to the rib base.
According to another embodiment, the ribs are bent at their rib bases attached to said tube at an acute angle with respect to a plane perpendicular to the tube axis. This embodiment results in a one-way bending of the whole ribbing.
The bending of the ribs is facilitated in an embodiment, where each of said ribs has at the end of its wings connecting parts, each of them joined to an adjacent rib and provided with a first cutout, and the part of each rib above the first cutouts is bent at an acute angle as compared to a plane perpendicular to the axis of the tube. Prefer
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Szabo Jozsef
Szucs Laszlo
Tasnadi Csaba
Cline William R.
Dubno Herbert
Energiagazdalkodasi Intezet
Ford John K.
Ross Karl F.
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