US20110132586A1 - Heat exchanger with tube bundle - Google Patents

Heat exchanger with tube bundle Download PDF

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Publication number
US20110132586A1
US20110132586A1 US12/960,585 US96058510A US2011132586A1 US 20110132586 A1 US20110132586 A1 US 20110132586A1 US 96058510 A US96058510 A US 96058510A US 2011132586 A1 US2011132586 A1 US 2011132586A1
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United States
Prior art keywords
heat exchanger
tube
tubes
exchanger tubes
tube bundle
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Abandoned
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US12/960,585
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English (en)
Inventor
Peter Diehl
Zbynek Stranak
Guillaume Hebert
Milan Risian
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Hanon Systems Corp
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Visteon Global Technologies Inc
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Application filed by Visteon Global Technologies Inc filed Critical Visteon Global Technologies Inc
Assigned to VISTEON GLOBAL TECHNOLOGIES, INC. reassignment VISTEON GLOBAL TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DIEHL, PETER, STRANAK, ZBYNEK, RISIAN, MILAN, HEBERT, GUILLAUME
Publication of US20110132586A1 publication Critical patent/US20110132586A1/en
Assigned to HALLA VISTEON CLIMATE CONTROL CORPORATION reassignment HALLA VISTEON CLIMATE CONTROL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VISTEON GLOBAL TECHNOLOGIES, INC.
Assigned to HANON SYSTEMS reassignment HANON SYSTEMS CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HALLA VISTEON CLIMATE CONTROL CORPORATION
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/163—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the invention relates to a heat exchanger, particularly an exhaust gas heat exchanger with a tube bundle.
  • Heat exchangers of the above mentioned kind serve to cool exhaust gas, particularly of internal combustion engines. Specifically, a cooled exhaust gas is added to a fresh air that is fed to the combustion process so that the oxygen content is minimized. Additionally, heat exchangers are configured to utilize a thermal energy inherent to the exhaust gas. A heat exchanger is typically used at a suction side of supercharged engines, at fuel cells, or in other cases. For use in a vehicle with an internal combustion engine, the most important field of application of the heat exchanger with a tube bundle, it is also required to minimize the structural volume.
  • WO 00/00778 describes a flat tube heat exchanger, where differently oriented flat tubes are formed U-shaped, in the U-region established as circular cross-section tubes. Fins are required between the U-shaped flat tubes to ensure optimum heat transfer to the surrounding medium.
  • the heat exchanger of WO 00/00778 is disadvantageous in that fins are necessary so that the heat exchanger requires more technical effort and space.
  • DE 10 2008 001 660 A1 describes a lightweight flow heat exchanger, wherein an exhaust gas conducting exchanger tube arranged separate is placed in a closed casing arranged separate. The casing is passed by a coolant that flows around the outside of the exchanger tube. Both ends of the exchanger tube are fluid-tightly passed through the casing cover that tightly closes the jacket part. Therefore, the inlet and outlet of the exchanger tube are located outside the casing.
  • the exchanger tube is designed as circular-section tube with different forms that enlarge the surface and break up the flow.
  • a disadvantage of the heat exchanger of DE 10 2008 001 660 A1 is the small heat exchanger area and thus, lower heat exchanging capacity related to the structural space of the heat exchanger. Circular cross-section tubes, further, have limited heat emitting properties.
  • DE 197 56961 A1 describes an arrangement of a heat exchanger with tubes that are arranged establishing one row next to each other and at least two rows behind each other and parallel to each other.
  • the tubes are heat transmittingly connected to cooling members designed as cooling fins.
  • Two tubes each form the legs of a tube fork made as one part, communicatingly connected to each other through a curved piece.
  • the tubes are established as flat tubes, having two planar longer side surfaces arranged parallel to each other and two shorter side surfaces connecting the longer side surfaces to each other.
  • the cooling fins each extend at least between adjacent flat tubes, the fins being heat transmittingly attached to the longer side surfaces of the fins.
  • the heat exchanger of DE 197 56961 A1 is disadvantageous due to the expensive use of cooling fins, which furthermore are not suitable with a liquid coolant that flows around the external surfaces of the tubes.
  • Tube bundles of tubes with circular cross-section achieve less package density, or larger clearances develop between the circular cross-sections, respectively, compared to other cross-sectional geometries such as triangular, rectangular or flat tube cross-sections.
  • the clearances between the circular cross-sections are less accessible to the medium that flows around them, because the cross-sectional area of the inlet into the clearance cross-sectional area is correspondingly narrow compared to the clearance cross-sectional area.
  • the ratio between the inlet and clearance cross-sectional areas is balanced.
  • the invention overcomes the shortcomings of the prior art by providing a heat exchanger with a tube bundle, wherein a structural volume of the heat exchanger is minimized without any loss in heat exchanger capacity, while dispensing with fins and minimizing a pressure loss.
  • the present invention provides the heat exchanger with a heat exchanger tube that is established separate.
  • the heat exchanger tube is placed in a closed casing that is established separate, passed by a coolant.
  • the coolant flows around the heat exchanger tube at the outside.
  • the casing establishes at least a casing cover and a jacket part, whereby the jacket part is tightly closed by the casing cover, both ends of the exchanger tube being fluid-tightly passed through the casing cover. Thereby, the inlet and outlet of the exchanger tube are located outside the casing.
  • part of the solution is a tube bundle provided with a U-shaped bend region and straight tube ends. At least in the region of the straight tube ends, the tube bundle is made of flat tubes.
  • Flat tubes have two plane longer side surfaces arranged parallel to each other and two shorter side surfaces connecting the longer side surfaces to each other.
  • a cross-sectional flow area is generally rectangular, having two long sides and two short sides each opposing one to the other.
  • Other flat tubes have cross-sections with two long sides connected through semicircular elements.
  • the problem of the invention is solved by that the U-shaped bend region has a cross-sectional shape different from the flat tube cross-section of the straight tube ends.
  • the straight tube ends of the flat tubes oppose each other with their narrow sides in the heat exchanger.
  • the straight tube ends of the flat tubes oppose each other with their wide sides. That means, in case the entire tube inclusive of the U-shaped bend region is made of flat tube, that in one alternative embodiment the tube is bent in the narrow side plane and in another alternative embodiment the tube is bent in the wide side plane.
  • the section modulus is high.
  • the flat geometry in the reversing region can also be produced in an alternative manner. But this solution is advantageous in that the wide side of the flat tube extends in direction of flow of the coolant that circulates in the casing of the heat exchanger. Therefore, optimal heat transfer is achieved.
  • the tube cross-section in the U-shaped bend region has a circular cross-sectional shape.
  • the cross-section of the tube in the U-shaped bend region alternatively has rectangular or oval-shaped cross-sectional shapes.
  • a circular cross-section is technologically advantageous as bending the flat tube is no longer necessary, the bending could be especially problematic if to be executed in the wide side plane of the profile. Further, a circular cross-section in the U-shaped bend region enables optimal flow conditions to be realized. This is particularly important if when the bend is established using a flat tube, it cannot be ensured that bending will not lead to a narrowed cross-section.
  • the tubes of the tube bundle are provided with a structured surface.
  • the structure in one embodiment consists of square recesses in the tube outside that are distanced from each other such that the distances are approximately double the side length of the squares.
  • the structure in alternative embodiments of this aspect of the invention, consists of annular or helical grooves formed in the tube walls.
  • the heat exchanger is designed such that it is used in the exhaust gas string of a motor vehicle.
  • the casing cover forms an interface for the connection of the heat exchanger to the exhaust system of the motor vehicle.
  • the advantages of the heat exchanger according to the invention have a particular effect in a motor vehicle, where the available installation space is restricted.
  • a heat exchanger optimized in that way, providing a high capacity of heat transfer while requiring little space is, therefore, very well suited for the use in a motor vehicle.
  • the heat exchanger is provided with a plurality of heat exchanger tubes located in the casing, which establish a tube bundle fluidly switched in parallel.
  • a coolant inlet and a coolant outlet are arranged, the coolant inlet and/or the coolant outlet positioned in the casing cover.
  • the heat exchanger is designed such that it can advantageously be used in the coolant-cooled charge air cooler of a motor vehicle.
  • the coolant cools the hot compressed fresh air coming from the turbocharger.
  • the heat exchanger is a coolant-cooled oil cooler of a motor vehicle.
  • the heat exchanger is particularly suitable for cooling hot engine oil using a coolant.
  • a particularly positive aspect of the invention is the possibility that the jacket part of the casing is made of a material with a melting temperature of below 1000° C.
  • materials can be used that must only meet the requirements resulting from the use of the cooling medium.
  • This relates, first, to pressure, temperature and chemical resistance. Chemical resistance is particularly important when oil is used as the cooling medium.
  • materials with a low melting temperature far less than 1000° C. such as plastics or aluminum, can be used for the jacket part. These materials would normally not withstand the exhaust gas temperatures.
  • This advantage results from the use of U-tubes for heat transfer as well as from that the shape is a closed U-bent shape. Additionally, the favorable possibility arises to be very free to choose the material of the cooler casing so that also light, inexpensive materials can be employed, which is decisive for the weight and the price of the final product.
  • the advantages of the invention are an increased heat exchanger capacity in a small structural space, an increased degree of freedom in arranging the U-bent heat exchanger tubes so that a higher package density is made possible.
  • the heat exchangers according to the invention are smaller and lighter. Due to the higher heat transfer efficiency of the heat exchanger, material is saved compared with heat exchangers of the prior art with the same capacity.
  • a heat exchanger comprises: a tube bundle including a plurality of heat exchanger tubes, each of the heat exchanger tubes having an inlet, an outlet, an outer surface, and a generally U-shaped bend region disposed between at least two straight tube ends, wherein at least a portion of the at least two straight tube ends includes flat tubes; a jacket part disposed around the tube bundle to enclose at least a portion of the tube bundle, wherein an interior is formed between the tube bundle and the jacket part to receive a coolant around the outer surface of each of the heat exchanger tubes; and a casing cover coupled to the jacket part to form a fluid tight seal therebetween, wherein the inlet and the outlet of each of the heat exchanger tubes fluid-tightly passes through the casing cover and extends outside of the casing cover.
  • a heat exchanger comprises: a tube bundle including a plurality of heat exchanger tubes, each of the heat exchanger tubes having an inlet, an outlet, a structured outer surface, and a generally U-shaped bend region disposed between at least two straight tube ends, wherein at least a portion of the at least two straight tube ends includes flat tubes, and wherein a bend region of at least one of the heat exchanger tubes has at least one of a generally circular cross-sectional shape, a generally oval cross-sectional shape, and a generally rectangular cross-sectional shape; a jacket part disposed around the tube bundle to enclose at least a portion of the tube bundle, wherein an interior is formed between the tube bundle and the jacket part to receive a coolant around the outer surface of each of the heat exchanger tubes; and a casing cover coupled to the jacket part to form a fluid tight seal therebetween, wherein the inlet and the outlet of each of the heat exchanger tubes fluid-tightly passes through the casing cover and extends outside of the casing cover.
  • FIG. 1 a heat exchanger with tube bundle of flat tube in top view
  • FIG. 1 b heat exchanger with tube bundle of flat tube in front view
  • FIG. 1 c heat exchanger with tube bundle of flat tube in side view
  • FIG. 2 heat exchanger with tube bundle of flat tube in exploded view
  • FIG. 3 a heat exchanger with tube bundle of transversally bent flat tube in top view
  • FIG. 3 b heat exchanger with tube bundle of transversally bent flat tube in front view
  • FIG. 3 c heat exchanger with tube bundle of transversally bent flat tube in side view
  • FIG. 4 heat exchanger with tube bundle of transversally bent flat tube in exploded view
  • FIG. 5 a heat exchanger with tube bundle of flat tube and circular-section tube in top view
  • FIG. 5 b heat exchanger with tube bundle of flat tube and circular-section tube in front view
  • FIG. 5 c heat exchanger with tube bundle of flat tube and circular-section tube in side view
  • FIG. 6 a casing and seal of the heat exchanger with tube bundle of flat tube and circular-section tube in perspective representation
  • FIG. 6 b tube bundle and casing cover of the heat exchanger of flat tube and circular-section tube in perspective representation
  • FIG. 6 c tube bundle and casing cover of the heat exchanger with flat tube and circular-section tube in side view;
  • FIG. 7 a heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube in top view
  • FIG. 7 b heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube in front view;
  • FIG. 7 c heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube in side view;
  • FIG. 8 a heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube—tube bundle and casing cover—in perspective representation;
  • FIG. 8 b heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube—jacket part with seal—in perspective representation;
  • FIG. 8 c heat exchanger with tube bundle of transversally arranged flat tube and circular-section tube—tube bundle and casing cover—in side view;
  • FIG. 9 a heat exchanger with offset arranged tube bundle of flat tube and circular-section tube—in top view
  • FIG. 9 b heat exchanger with offset arranged tube bundle of flat tube and circular-section tube—in front view
  • FIG. 9 c heat exchanger with offset arranged tube bundle of flat tube and circular-section tube—in side view;
  • FIG. 10 a heat exchanger with offset arranged tube bundle of transversally arranged flat tube and circular-section tube in top view;
  • FIG. 10 b heat exchanger with offset arranged tube bundle of transversally arranged flat tube and circular-section tube in front view;
  • FIG. 10 c heat exchanger with offset arranged tube bundle of transversally arranged flat tube and circular-section tube in side view;
  • FIG. 11 a heat exchanger with offset arranged tube bundle of transversally arranged flat tube and circular-section tube in perspective representation
  • FIG. 11 b casing of a heat exchanger in perspective representation
  • FIG. 12 a heat exchanger with offset arranged tube bundle of flat tube and circular-section tube in perspective representation
  • FIG. 12 b casing of a heat exchanger in perspective representation
  • FIG. 13 a heat exchanger with offset arranged tube bundle of transversally arranged flat tube and circular-section tube in perspective representation
  • FIG. 13 b casing of a heat exchanger in perspective representation.
  • FIG. 1 a shows a heat exchanger 1 with tube bundle 15 of flat tube in top view, wherein the narrow sides of the flat tubes that form the heat exchanger tube 6 are seen. Both the straight tube ends 2 and the bend region 3 consist of flat tube that in the bend region 3 was bent in the narrow side plane. Arrows identify the direction of flow of the inflowing gas with the inlet 12 and the outlet 13 marked separately. Inlet 12 and outlet 13 are passed through the casing cover 4 .
  • FIG. 1 b shows a heat exchanger 1 with tube bundle 15 of flat tube in front view, showing the arrangement of the ends 11 of the heat exchanger tubes 6 on the casing cover 4 .
  • the tube bundle 15 is established such that always three heat exchanger tubes 6 with different radii in the bend region 3 that match into each other are arranged in each other, and always three of these groups are arranged side by side so that always nine inlets 12 and outlets 13 pass the casing cover 4 .
  • FIG. 1 c shows a heat exchanger 1 with tube bundle 15 of flat tube in side view with the wide side of the heat exchanger tubes 6 established as flat tube seen.
  • the straight tube ends 2 turn into the bend region 3 at one end, at the other end forming the ends 11 of the heat exchanger tube 6 .
  • FIG. 2 shows a heat exchanger 1 with tube bundle 15 of flat tube in exploded view, whereby in the upper region of the figure, the jacket part 5 with the seal 14 is seen, which when the casing 5 is closed ensures tight closure of the coolant filled interior against the environment.
  • the tube bundle 15 is shown connected to the casing cover 4 .
  • the heat exchanger tubes 6 bent U-shaped in the narrow side plane, established as flat tubes, can be seen forming the tube bundle 15 in dense package within each other and arranged side by side based on different radii in the bend region 3 .
  • the ends 11 of the heat exchanger tube 6 pass the casing cover 4 and are fixed in the casing cover 4 .
  • the heat exchanger tubes 6 , or their ends 11 , respectively form the interface 7 that serves to connect the heat exchanger 1 to the exhaust gas system of a motor vehicle.
  • the exhaust gas then enters the inlet 12 , and after the heat has been transferred, the cooled exhaust gas exits the heat exchanger 1 through the outlet 13 .
  • the coolant flows into the heat exchanger 1 , especially the jacket part 5 of the casing.
  • the coolant enters and exits through the openings in the casing cover 4 , the coolant inlet 9 and the coolant outlet 10 .
  • a partition wall 8 is attached to the casing cover 4 , the partition wall 8 projecting into the U-shaped bend of the heat exchanger tube 6 with the smallest radius. This forces the coolant to flow largely along the heat exchanger tubes 6 instead of on the shortest way near to the casing cover 4 from the coolant inlet 9 to the coolant outlet 10 .
  • the jacket part 5 of the casing is made of a material with a low melting temperature, especially a plastic material. But it can be also made of other materials with low melting temperatures, such as aluminum.
  • the material used must only meet the requirements set by the use of the cooling medium. The requirements relate, first of all, to pressure, temperature and chemical resistance. Chemical resistance is particularly important when oil is used as the cooling medium. Also, cooling water with additives can make specific demands to the chemical resistance.
  • materials with a low melting temperature which can be far below 1000° C., such as plastics or aluminum, can be used for the jacket part 5 . These materials would normally not withstand the exhaust gas temperatures.
  • the favorable possibility arises to be very free to choose the material of the cooler casing, especially the jacket part 5 so that also light, inexpensive materials can be employed, which is decisive for the weight and the price of the finished product.
  • FIG. 3 a shows a heat exchanger 1 with tube bundle 15 of transversally bent flat tube in top view, wherein as distinct from FIG. 1 a view is in direction of the wide side of the flat tube. Also, here, the whole heat exchanger tube 6 completely consists of a flat tube. In the embodiment shown, the flat tube was given a U-shape in the wide side plane.
  • FIG. 3 b shows a heat exchanger 1 with tube bundle 15 of transversally bent flat tube in front view, wherein, as in the representation of FIG. 1 b , the casing cover 4 is shown with the tube passages arranged homogeneous. Due to the orientation of the cross-section of the flat tubes, only two U-shaped bends of the heat exchanger tube 6 are arranged within each other, but five of these couples are staggered above each other. Therefore, there are 10 inlets 12 and 10 outlets 13 each, through which the exhaust gas enters and exits, respectively, the heat exchanger 1 .
  • FIG. 3 c shows a heat exchanger 1 with tube bundle 15 of transversally bent flat tube in side view with the view in direction of the narrow side of the heat exchanger tubes 6 which are established as flat tubes.
  • the straight tube end 2 turns into the bend region 3 .
  • FIG. 4 shows a heat exchanger 1 with tube bundle 15 of transversally bent flat tube, which is used as heat exchanger tube 6 , in exploded representation.
  • the upper part of the figure shows the jacket part 5 of the casing and the accompanying seal 14 .
  • the lower part of the figure shows the tube bundle 15 , which consists of heat exchanger tubes 6 , connected to the casing cover 4 .
  • the heat exchanger tubes 6 are arranged such that the U-shaped bend is in the wide side plane.
  • the complete heat exchanger tubes 6 , both the straight tube end 2 and the bend region 3 as well, are made of flat tube.
  • the interface 7 is positioned at the bottom.
  • FIG. 5 a shows a heat exchanger 1 with tube bundle 15 of flat tube and circular-section tube in top view, wherein, as distinct from the above representations, particularly FIG. 1 a with the same view to the narrow sides of the flat tubes, the heat exchanger tubes 6 are not exclusively made of flat tube.
  • the straight tube ends 2 which are made of flat tube, in the bend region 3 turn to circular-section tubes.
  • the whole bend region 3 is made of tubes with circular cross-section.
  • the changing cross-section changes the flow conditions in the bend region 3 , or in the transition region between the straight tube end 2 and the bend region 3 , respectively. Turbulence develops at the point of inflow into the bend region 3 with circular cross-section. Also, the flow resistance, which in the bend region 3 is higher than in a straight tube, reduces due to the enlarged cross-section.
  • FIG. 5 b shows a heat exchanger 1 with tube bundle 15 not shown, of flat tube and circular-section tube in front view, whereby the arrangement of the tube passages through the casing cover 4 is not different from the representation in FIG. 1 b.
  • FIG. 5 c shows the tube bundle 15 of a heat exchanger 1 of fiat tube and circular-section tube in side view with the wide sides of the straight tube ends 2 seen. Also seen is a transition region 16 , which shows trapezoidal in the side view. This transition region serves to match the rectangular cross-section of the flat tube with the circular cross-section of the tube section that forms the bend region 3 .
  • FIG. 6 a shows casing 5 and seal 14 of the heat exchanger 1 with tube bundle 15 of flat tube and circular-section tube in perspective representation. The jacket part 5 and the seal 14 are seen.
  • FIG. 6 b shows tube bundle 15 and casing cover 4 of the heat exchanger 1 of flat tube and circular-section tube in perspective representation.
  • the casing cover 4 accommodates the straight tube ends 2 , which at the bottom of the casing cover 4 form the interface 7 .
  • the heat exchanger tubes 6 are formed of the bend regions 3 .
  • the bend region 3 as distinct to the straight tube end 2 that is made of flat tube, is made of tube with circular cross-section.
  • FIG. 6 c shows tube bundle 15 and casing cover 4 of the heat exchanger 1 with flat tube and circular-section tube in side view with at least the wide sides of the outer heat exchanger tubes 6 that are formed of flat tube to be seen.
  • Flat tubes are only used in the region of the straight tube ends 2 , while the bend region 3 is formed of tubes with circular cross-section.
  • This feature of one embodiment of the invention shows in the side view as reduced width of the heat exchanger tube 6 in the bend region 3 .
  • FIG. 7 a shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube in front view.
  • the flat tubes of a communicating tube bend of the heat exchanger 1 are oriented with the shorter sides to each other. Communication of the two straight tube ends 2 at their upper ends is over the bend region 3 , which in the example of embodiment represented is made of circular-section tube.
  • a transition region 16 ensures the match of the cross-sections of flat tube and circular-section tube.
  • the fluid-tight passage 17 seals the interior of the heat exchanger 1 from the environment in the region of the tube passages.
  • FIG. 7 b shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube in top view, wherein the arrangement of the passages of the straight tube ends 2 through the casing cover 4 shows that five inner and five outer bend-shaped heat exchanger tubes 6 , not shown in the figure, are located on the casing cover 4 .
  • FIG. 7 c shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube in side view, showing the flat side of the flat tubes that form the straight tube ends 2 .
  • the flat tube turns into the circular-section tube, forming the bend region 3 in the example of embodiment shown.
  • the heat exchanger tubes 6 positioned one above the other are in a skillful alternatingly offset arrangement. This allows, in spite of changing to a circular geometry, to achieve a high packaging density in the bend region 3 , the region of reversal.
  • FIG. 8 a shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube in perspective representation, wherein tube bundle 15 and casing cover 4 are seen in detail.
  • Coolant inlet 9 and coolant outlet 10 are arranged in the casing cover 4 .
  • the partition 8 is positioned in the possible short circuit flow path, extending between the casing cover 4 and the bend region 3 .
  • FIG. 8 b shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube in perspective representation, whereby here the jacket part 5 with the seal 14 is shown.
  • FIG. 8 c shows a heat exchanger 1 with tube bundle 15 of transversally arranged flat tube and circular-section tube, again with the representation of tube bundle 15 , partition 8 and casing cover 4 , but in side view. It is seen how the flat tube, seen as narrow in this view, of the straight tube end 2 turns into the wider circular-section tube of the bend region 3 , located on the right-hand side of the figure.
  • FIG. 9 a shows a heat exchanger 1 with offset arranged tube bundle 15 of flat tube and circular-section tube in top view.
  • the straight tube ends 2 that over the transition region 16 turn into the bend region 3 are shown.
  • the bend region 3 is made of circular-section tube, seen in the figure by the cross-section enlarged in the bend region 3 .
  • the heat exchanger tubes 6 established as flat tubes, in one embodiment of the invention shown are arranged such that the wide sides of the flat tubes oppose each other. Three groups of bend-shaped heat exchanger tubes 6 each of a different height are positioned below each other or within each other.
  • Arrows indicate the direction of flow of the fluid in the tubes, which in certain embodiments is the exhaust gas of an internal combustion engine.
  • FIG. 9 b shows the casing cover 4 of a heat exchanger 1 in front view.
  • the passages of the straight tube ends 2 which are established passing the casing cover 4 fluid-tightly sealed, are arranged offset.
  • Three groups of bend-shaped heat exchanger tubes 6 are positioned slightly offset transverse to the direction of flow, with in one embodiment, the offset being half the length of the long side of the cross-section of the flat tube.
  • the groups of bend-shaped heat exchanger tubes 6 which together form the tube bundle 15 also not shown in this figure, consist of flat tube and circular-section tube, with the flat tube used in the region of the straight tube end 2 , the circular-section tube used in the bend region 3 .
  • FIG. 9 c shows offset arranged tube bundles 15 of a heat exchanger 1 in side view, with the tube bundles 15 consisting of flat tube and circular-section tube.
  • the wide side of the flat tubes is seen that establish the region of the straight tube end 2 .
  • the heat exchanger tube 6 turns to the bend region 3 established as circular-section tube.
  • FIG. 10 a shows a heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in top view.
  • the heat exchanger tubes 6 established as flat tubes, are arranged such that the narrow sides of the flat tubes oppose each other.
  • Three groups of bend-shaped heat exchanger tubes 6 are positioned below each other and within each other, respectively.
  • the heat exchanger tubes 6 positioned one above the other are in a skilful alternatingly offset arrangement. This allows, in spite of turning into a circular geometry, to achieve a high packaging density in the bend region, or the region of reversal, respectively.
  • FIG. 10 b shows a heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in front view.
  • the passages of the straight tube ends 2 are seen on the casing cover 4 .
  • the passages each of the inlet 12 and outlet 13 are marked on the casing cover 4 .
  • each group includes five single heat exchanger tubes 6 .
  • FIG. 10 c shows the tube bundle 15 of a heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in side view. This view enables to see the narrow sides of the flat tubes that establish the straight tube ends 2 . On the right-hand side of the figure, the transition region 16 and further, the cross-section of the circular-section tube that establishes the bend region 3 are shown.
  • FIG. 11 a shows a heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in perspective representation, the tube bundle 15 comprising a plurality of heat exchanger tubes 6 , eleven tubes in the embodiment shown here, in dense package.
  • the flat tubes oppose each other with their narrow sides.
  • the heat exchanger tubes 6 are anchored in the casing cover 4 , which on its rear establishes the interface 7 .
  • FIG. 11 b shows the heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in exploded representation with the jacket part 5 and the seal 14 shown, but the tube bundle 15 of transversally arranged flat tube and circular-section tube is not shown.
  • FIG. 12 a shows a heat exchanger 1 with offset arranged tube bundle 15 of flat tube and circular-section tube in perspective representation, the tube bundle 15 comprising a plurality of heat exchanger tubes 6 , eleven tubes in the embodiment shown here, in dense package.
  • the flat tubes oppose each other with their wide sides.
  • the heat exchanger tubes 6 are anchored in the casing cover 4 , which on its rear establishes the interface 7 .
  • the partition 8 which vertically projects from the casing cover 4 , prevents short circuit flows of the coolant that circulates freely within the heat exchanger 1 .
  • FIG. 12 b shows the heat exchanger 1 with offset arranged tube bundle 15 of flat tube and circular-section tube in exploded representation with the jacket part 5 and the seal 14 shown, but the tube bundle 15 of flat tube and circular-section tube is not shown.
  • the outer surface of the heat exchanger tubes 6 used in the previous examples is provided with a helically embossed groove.
  • a smooth heat exchanger tube 6 without embossing can be used.
  • FIG. 13 a shows the heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in perspective representation. Distinct to the embodiment shown in FIG. 12 a with smooth or helically grooved tube wall of the heat exchanger tube 6 , the tube wall of the alternative embodiment shown here is more intensely structured. The structure is applied to both the region of the straight tube ends 2 and the bend region 3 . In the embodiment shown, a structure of square recesses is used. The square recesses are applied to the wide side of the flat tube, are arranged mosaic-like offset and project into the flow cross-section of the flat tube.
  • FIG. 13 b shows the heat exchanger 1 with offset arranged tube bundle 15 of transversally arranged flat tube and circular-section tube in exploded representation with the jacket part 5 and the seal 14 shown, but the tube bundle 15 of flat tube and circular-section tube not shown.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US12/960,585 2009-12-08 2010-12-06 Heat exchanger with tube bundle Abandoned US20110132586A1 (en)

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DE102009047620.2A DE102009047620C5 (de) 2009-12-08 2009-12-08 Wärmeübertrager mit Rohrbündel

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US20090013676A1 (en) * 2007-07-11 2009-01-15 Andreas Capelle Lightweight flow heat exchanger
US20160363391A1 (en) * 2015-06-15 2016-12-15 Hyundai Motor Company Can-type heat exchanger
US10077952B2 (en) 2014-05-02 2018-09-18 Dana Canada Corporation Manifold structure for re-directing a fluid stream
US20190186434A1 (en) * 2017-12-15 2019-06-20 Hanon Systems Device for heat transfer
US11168942B2 (en) * 2019-03-08 2021-11-09 Hamilton Sundstrand Corporation Circular core for heat exchangers

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DE102012106782A1 (de) * 2012-07-26 2014-01-30 Halla Visteon Climate Control Corporation Wärmeübertrager zur Abgaskühlung in Kraftfahrzeugen
JP6057154B2 (ja) * 2012-09-28 2017-01-11 パナソニックＩｐマネジメント株式会社 熱交換器
WO2015063858A1 (ja) * 2013-10-29 2015-05-07 三菱電機株式会社 管継手、熱交換器、及び、空気調和装置
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KR102173402B1 (ko) * 2016-08-25 2020-11-03 한온시스템 주식회사 차량용 ｅｇｒ 쿨러

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US20090013676A1 (en) * 2007-07-11 2009-01-15 Andreas Capelle Lightweight flow heat exchanger
US10077952B2 (en) 2014-05-02 2018-09-18 Dana Canada Corporation Manifold structure for re-directing a fluid stream
US20160363391A1 (en) * 2015-06-15 2016-12-15 Hyundai Motor Company Can-type heat exchanger
US20190186434A1 (en) * 2017-12-15 2019-06-20 Hanon Systems Device for heat transfer
US10900446B2 (en) * 2017-12-15 2021-01-26 Hanon Systems Device for heat transfer
US11168942B2 (en) * 2019-03-08 2021-11-09 Hamilton Sundstrand Corporation Circular core for heat exchangers

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DE102009047620A1 (de) 2011-06-09
JP5395783B2 (ja) 2014-01-22

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