Tube for a heat exchanger
a heat exchanger and tube technology, applied in the direction of tubes, lighting and heating apparatus, laminated elements, etc., can solve the problems of heat transfer rate, stress, pressure drop, etc., and achieve the effect of increasing heat transfer, efficient solving, and increasing heat transfer
Inactive Publication Date: 2016-04-21
BORGWARNER EMISSIONS SYST SPAIN S L U
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Benefits of technology
The invention is a heat exchanger tube for use in EGR systems, which improves the efficiency of heat exchangers and is environmentally friendly.
Problems solved by technology
This clear advantage has the drawback that although heat exchange increases, pressure drop also increase.
Such tube is very efficient as regards exchange rate but has specific problems due to the thermal expansion effect of the inner sheet, for example, which can cause fatigue in areas where this expansion generates stresses.
The presence of dimples increase turbulence and therefore the heat transfer rate.
Nevertheless, such patterns make manufacturing the tube difficult since the same mold cannot be used in stamping along the entire length of the tube or actuators modifying the depth of the dimples as the sheet stamping operation for obtaining the tube progresses are required in machines.
Although these patterns increase the heat transfer rate, they also increase pressure drop.
Method used
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[0020]The tube for a heat exchanger according to the present invention is a tube having a flattened configuration comprising a first essentially planar face and a second essentially planar face parallel to and spaced from the first face. The flattened configuration of the tube must therefore be interpreted by the presence of the first planar face and the second planar face arranged parallel to one another and both faces being connected by side walls. Although the side walls can have any configuration, the most common embodiments use a configuration in a semicircular segment according to the section of the tube. At least one face has a plurality of dimples configured according to a pattern that is repeated along the longitudinal direction X-X′ of the tube. The longitudinal direction of the tube is the direction along which the directrix of the tube extends.
[0021]The pattern is configured by means of a plurality of groups of dimple alignments covering the width of the planar face. The...
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The present invention relates to a tube for a heat exchanger comprising a region with dimples according to a specific pattern such that it increases the degree of heat exchange with low pressure drop. The use of a tube for a heat exchanger according to the invention in heat exchangers for EGR (Exhaust Gas Recirculation) systems is of particular interest. The present invention is also considered of interest for the environment as it increases the efficiency of the heat exchangers for which it is designed.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 877,415 filed Oct. 7, 2015, which is incorporated herein in its entirety by reference thereto.OBJECT OF THE INVENTION[0002]The present invention relates to a tube for a heat exchanger comprising a region with dimples according to a specific pattern such that it increases the degree of heat exchange with low pressure drop.[0003]The use of a tube for a heat exchanger according to the invention in heat exchangers for EGR (Exhaust Gas Recirculation) systems is of particular interest. The present invention is also considered of interest for the environment as it increases the efficiency of the heat exchangers for which it is designed.BACKGROUND OF THE INVENTION[0004]Heat exchangers are devices promoting heat transfer between two fluids through an exchange surface which prevents the mixing of both fluids. The amount of transferred heat is proportional to the exchange surf...
Claims
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IPC IPC(8): F28F1/04F28F1/40
CPCF28F1/40F28F1/04F28F1/02F28F13/06F28F2250/10F28F2001/027F28F13/12F28F3/044F28F3/042F28F1/025F28D7/163
Inventor JULIANA, RAFAELLORENZO, MANUEL
Owner BORGWARNER EMISSIONS SYST SPAIN S L U