US20050199378A1 - Heat exchanger core and corrugated rib - Google Patents
Heat exchanger core and corrugated rib Download PDFInfo
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- US20050199378A1 US20050199378A1 US11/078,849 US7884905A US2005199378A1 US 20050199378 A1 US20050199378 A1 US 20050199378A1 US 7884905 A US7884905 A US 7884905A US 2005199378 A1 US2005199378 A1 US 2005199378A1
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- Prior art keywords
- heat exchanger
- core
- wave
- louvers
- wave flanks
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
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- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
- F28F1/128—Fins with openings, e.g. louvered fins
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- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
Definitions
- the present invention is directed toward heat exchangers, and particularly toward heat exchanger cores having flat tubes with ribs therebetween.
- Heat exchangers are well known in the art.
- heat exchangers typically include a core consisting of a plurality of tubes carrying a liquid or gas fluid with corrugated ribs disposed between the tubes.
- Collecting tanks are typically connected to the ends of the tubes to facilitate re-circulation of the fluid through the associated system (e.g., engine block) and then back through the heat exchanger tubes.
- the fins are heated by their contact with the fluid carrying tubes, and the cooling air takes away heat by cooling the fins.
- the present invention is directed toward overcoming one or more of the problems set forth above.
- a heat exchanger core is provided with the front substantially vertical and facing cooling air flow.
- the core includes at least one row of flat tubes through which a liquid or gas flows, and corrugated ribs arranged in between the flat tubes.
- the ribs have wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of the core and an air outlet on the rear of the core.
- the wave flanks are at an angle ⁇ which is oblique to the core front and rear whereby the air inlet of each channel is offset relative to the corresponding air outlet.
- the wave flanks are substantially planar with louvers in a significant section of the wave flanks protruding from the plane of the flank.
- the louvers have an angle of bending defining protrusions in a common direction from the wave flank plane, with the angle of bending of each louver being substantially the same.
- the louvers have an angle of bending defining protrusions in opposite directions from the wave flank plane whereby half of the louvers are sloped in the direction of cooling air flow and the other half are sloped against the cooling air direction, the angle of bending of each louver being substantially the same.
- a connector has edges bent at an angle corresponding to angle of bending of the louvers, with the connector being substantially in the center of the section of the wave flanks having louvers.
- the surface of the wave flanks is substantially flat.
- the wave flanks have a curved contour between the air inlet and air outlet.
- a corrugated rib for a heat exchanger core is provided, where the corrugated rib is formed by rolling a longitudinally extending metal sheet and includes wave flanks defining cooling flow channels therebetween.
- the wave flanks have an oblique slope angle relative to the edges of the metal sheet and further include louvers protruding from the plane of the wave flanks.
- the surfaces of the wave flanks are substantially flat.
- the surfaces of the wave flanks are a contour consisting of a single arc.
- the louvers are fields of louvers arranged generally parallel and close to each other.
- a heat exchanger core oriented with the front substantially vertical and facing cooling air flow
- the core including at least one row of flat tubes through which a liquid or gas flows and corrugated ribs arranged in between the flat tubes.
- the ribs have wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of the core and an air outlet on the rear of the core.
- the air inlet of each channel is aligned relative to the corresponding air outlet with the wave flanks between such inlets and outlets having a contour consisting of a single arc.
- louvers protrude from the surface of the wave flank in a significant section of the wave flanks.
- FIG. 1 illustrates a portion of a heat exchanger incorporating the present invention
- FIG. 2 illustrates the previously described aspect of one prior art heat exchanger
- FIG. 3 is a perspective view of one embodiment of a corrugated rib according to the present invention.
- FIG. 4 is a plan view illustrating the orientation of the wave flanks of a corrugated rib relative to the adjacent tube according to the present invention
- FIG. 5 is a perspective view of the corrugated rib and tube of FIG. 4 ;
- FIG. 6 is a plan view illustrating the orientation of the wave flanks of a corrugated rib relative to the adjacent tube according to another embodiment of the present invention.
- FIG. 7 is a perspective view of the corrugated rib and tube of FIG. 6 ;
- FIG. 8 is a side view of a corrugated rib according to another aspect of the present invention.
- FIGS. 9-12 illustrate alternate orientations of louvers in wave flanks along cross-sectional line A-A of FIG. 8 ;
- FIG. 13 is similar to FIGS. 9-13 , illustrating an orientation of louvers in contoured wave flanks
- FIGS. 14-16 are exemplary cross-sectional profiles of corrugated ribs which may be used according to the present invention.
- FIGS. 17-18 illustrate one manner of producing corrugated ribs with flat wave flanks according to one aspect of the present invention
- FIG. 19 illustrates a corrugated rib formed according to FIGS. 17-18 ;
- FIGS. 20-21 illustrate one manner of producing corrugated ribs with contoured wave flanks according to one aspect of the present invention
- FIG. 22 illustrates a corrugated rib formed according to FIGS. 20-21 ;
- FIG. 23 is a top view of a corrugated rib according to yet another aspect of the present invention, with contoured flanks and aligned inlets and outlets.
- a heat exchanger 30 according to the present invention is illustrated in FIG. 1 .
- the heat exchanger 30 is set up perpendicular to the flow direction of the cooling air (arrow 32 ) as is prescribed in most applications in the automotive field or elsewhere, and includes a collecting tank 36 with an inlet or outlet connector 40 through which liquid or hot charge air flows in order to flow through a series of flat tubes 44 to the other collecting tank (not shown) lying on the opposite end of flat tube 44 .
- the gas or liquid flowing in the flat tubes 44 is cooled by cooling air flowing through corrugated ribs 46 firmly bonded to the flat tubes 44 (e.g., by soldering) to together form the heat exchanger grate or core such as is generally well known in the art.
- the corrugated ribs 46 include wave flanks 50 which define channels 52 therebetween, with the channels 52 being laid out so that the corresponding air inlet 54 into each of the channels 52 is offset relative to the corresponding air outlet 56 from each of the channels 52 .
- the air inlets 54 are higher than the level of the air outlets 56 for each channel 52 .
- the air outlets could lie higher than the associated air inlets or, in a heat exchanger having horizontally oriented tubes and ribs, the air outlets may lie to the right or left of the associated inlets (offset by 60 as indicated in FIGS. 4 and 6 ).
- each air molecule may advantageously come into contact with the wave flanks 50 of the corresponding channel 52 so that a higher efficiency of heat exchange is present. Inefficient horizontal flow through the channels 52 or flow without deflection, as generally can occur in the prior art, is avoided.
- the size of the offset is influenced by the size of the angle between the wave direction and vertical or horizontal, as well as the depth of the heat exchanger grate. With a deeper heat exchanger grate at the same angle, the offset is larger than in a flatter heat exchanger grate.
- Louvers 64 may also be advantageously provided in the wave flanks 50 for heat exchange efficiency whereby air turbulence may be improved without undesirably increasing the pressure loss of the cooling air stream. As illustrated in FIG. 3 , the louvers 64 extend over a significant section of the wave flanks 50 . The heat exchange rate between the liquid flowing in flat tubes 44 or, for example, a strongly heated charge air with the cooling air may thereby be significantly raised.
- the louvers may be variously configured as desired, depending upon the application.
- louvers 64 are provided such as illustrated, it should be appreciated that the channels 52 will not be discrete, whereby an air particle entering a channel 52 through its inlet 54 may not emerge through the corresponding outlet 56 . As a result, at least one part of the cooling air can be distributed to adjacent channels before it leaves the heat exchanger core again at the outlets.
- louvers may be advantageously configured to protrude from the plane of the wave flanks 50 running with the slope angle, with the heat exchanger core arranged with a slope to the direction of flow of the cooling air.
- the depicted heat exchanger 10 may be designed with or without a tube bottom.
- corrugated ribs 46 in the depicted FIGS. 4-5 embodiment generally represent a parallelogram in top view, an angle a is produced between the ends of the flat tubes 44 running perpendicular to the vertical 66 and between the plane of the indicated tube bottom 68 (see FIG. 1 ) running perpendicular to vertical 66 and the corrugated rib 46 . Should this angle a be perceived as a disadvantage, it can be avoided by appropriate choice of the position and contour of the separation cut during production of the corrugated ribs 46 , which is done from a metal sheet.
- FIGS. 4 and 5 show views of a flat tube 44 over its broad side with a corrugated rib 46 with obliquely running wave flanks 50 resulting in the indicated offset 60 between air inlets 54 and air outlets 56 .
- the angle ⁇ 1 between the wave direction 70 and the vertical 66 is indicated in FIG. 4 , with vertical 66 coinciding with the trend of the edges of flat tube 44 .
- the wave direction 70 is always the direction perpendicular to the wave flanks 50 .
- the angle ⁇ 2 between the wave direction 70 and the horizontal 60 is present when a heat exchanger grate or core is arranged vertically with the flat tubes 44 extending horizontally (it being understood that the direction of flow of the cooling air is generally horizontal. In these cases as well, the cooling air stream naturally impinges on one of the narrow sides of flat tube 44 to then flow through the corrugated ribs 46 .
- FIGS. 6 and 7 differ from FIGS. 4 and 5 in that the wave flanks 50 of the ribs 46 c are provided with a rounding or a contour 80 .
- FIG. 8 shows a perspective view of the corrugated rib 46 in which the trend of a cross-section A-A is indicated
- FIGS. 9-13 show different variants of louvers 64 in wave flanks 50 according to cross-section A-A.
- a connector 84 is provided between the louvers 64 arranged in two fields, the edges 85 of connector 84 being bent, with the angle of bending corresponding to the set angle 86 of the individual louvers 64 .
- the louvers 64 can either be all aligned in one direction (e.g., FIGS. 11, 13 ) or in fields with opposite directions of alignment (e.g., FIGS. 9-10 ).
- FIG. 12 shows a variant in which the louvers 64 alternately protrude from the plane 88 of wave flanks 50 .
- FIG. 13 shows a variant with a contour 80 in the wave flanks 50 also provided with louvers 64 , as well as an offset 60 a between air inlet 54 and air outlet 56 .
- different alignment angles 86 can also be used with the alignment angle 86 being, for example, changed along the contour 80 to become larger or smaller. While louvers have been used in the art, to the knowledge of the applicant they have thus far not been suggested for use with a slope angle and/or with corrugations of the corrugated rib running with a contour.
- FIGS. 14-16 illustrate alternate cross-sectional profiles of corrugated ribs 46 which may be produced by rolling.
- Such profiles may include, for example, the provision of the edges 90 with a larger bending radius 92 than the other bending edge. This may simplify production by rolling, with loosening of the corrugated rib 46 from the roller die facilitated by such profile.
- FIGS. 17-18 show production of corrugated ribs 46 with flat wave flanks 50 having a slope relative to the edges.
- Rolls 100 , 101 are designed with a corresponding oblique toothing 103 .
- the roller elements 100 , 101 consist of a corresponding number of disk-like parts 104 that are assembled into a roller body.
- Each disk-like part 104 on the upper roll 100 cooperates with a corresponding part 104 on the lower roll 101 in the fashion of a blade in order to produce louvers 64 and their alignment from the plane 88 of wave flanks 50 (e.g., FIG. 19 ).
- corrugated ribs 46 according to the present invention may be produced cost-effectively on a roller machine (commonly used for large series production) with relatively high advance speed.
- roller machines may include a roll pair in a so-called roll stand and have an appropriate drive unit.
- FIGS. 20 and 21 also illustrate rolling, in this case forming corrugated ribs 46 c with a contour 80 of the wave flanks 50 such as previously described.
- the contour of the oblique toothing 103 a must naturally correspond to the contour on the wave flanks 50 , and emergence of the finished corrugated ribs 46 from the roll pair must be provided with an angle ⁇ corresponding to the slope angle.
- a region of the corrugated rib 46 is pushed together (tightened) before being brought to the desired division length L (see FIG. 3 ) at an angle corresponding to the slope angle.
- FIG. 23 shows a top view of a corrugated rib 46 with an arc-like contour 80 a of wave flanks 50 , as proposed in an independent alternative solution, with no offset 60 between the air inlets 54 and the air outlets 56 .
- Louvers 64 may also be provided in this version), and the particular shape of the contour 80 a may be selected depending upon the particular technical considerations of the heat exchanger and expected environment. It should be appreciated that the corrugated rib 46 of this variant also offers many of the advantages of the invention including enhanced heat exchange between the media as a result of a lengthened path for the cooling air.
- the present invention may offer improved efficiency of heat exchange for the common situation in which the heat exchanger core may be mounted perpendicular to the direction of air flow.
- the channels of the corrugated ribs are formed by the corrugated flanks so that the corresponding air inlet into each of the channels is arranged offset relative to the corresponding air outlet from each of the channels.
- the air can no longer flow horizontally through the channels, as in the prior art, since it is diverted by the vertical offset.
- horizontal flat tubes with corrugated ribs in-between are chosen according to the invention, the horizontally-flowing cooling air is diverted according to the offset in the horizontal.
- each air particle is forced to intensive contact with the wave flanks.
- increased heat exchange intensity is achieved as a result of a longer connection path between the corrugated rib and the broad sides of the flat tubes, causing more intense heat exchange because it runs obliquely to the longitudinal axis of the flat tube.
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Abstract
A heat exchanger core with the front substantially vertical and facing cooling air flow, with at least one row of flat tubes through which a liquid or gas flows, and corrugated ribs arranged in between the flat tubes. The ribs have wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of the core and an air outlet on the rear of the core. The wave flanks are at an angle β which is oblique to the core front and rear whereby the air inlet of each channel is offset relative to the corresponding air outlet. The wave flanks may also be a single arc. Corrugated ribs with wave flanks having an oblique slope angle relative to the edges of the metal sheet and louvers protruding from the plane of the wave flanks may also be included.
Description
- Not applicable.
- Not applicable.
- Not applicable.
- The present invention is directed toward heat exchangers, and particularly toward heat exchanger cores having flat tubes with ribs therebetween.
- Heat exchangers are well known in the art. In the automotive and other fields, for example, heat exchangers typically include a core consisting of a plurality of tubes carrying a liquid or gas fluid with corrugated ribs disposed between the tubes. Collecting tanks are typically connected to the ends of the tubes to facilitate re-circulation of the fluid through the associated system (e.g., engine block) and then back through the heat exchanger tubes. The fins are heated by their contact with the fluid carrying tubes, and the cooling air takes away heat by cooling the fins.
- Due to the advantages of minimized weight and size in many environments, particularly automobile engine compartments, a variety of structures have been proposed to provide efficient heat exchange in compact and lightweight heat exchangers. Among those proposals is the heat exchanger disclosed in U.S. Pat. No. 5,505,257, which is directed to heat exchangers which are tilted at an angle α from vertical 10 rather than normal to the flow of cooling air as is sometime necessitated by space constraints (as illustrated in
FIG. 2 hereof). In that proposal, theribs 12 are angled relative to the longitudinal orientation of thetubes 14 so as to account for the tilt and still define flow channels which are parallel to the direction of air flow into the core (whereby theirinlets 16 and outlets 18 are aligned in the direction of air flow). - The present invention is directed toward overcoming one or more of the problems set forth above.
- According to one aspect of the invention, a heat exchanger core is provided with the front substantially vertical and facing cooling air flow. The core includes at least one row of flat tubes through which a liquid or gas flows, and corrugated ribs arranged in between the flat tubes. The ribs have wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of the core and an air outlet on the rear of the core. The wave flanks are at an angle β which is oblique to the core front and rear whereby the air inlet of each channel is offset relative to the corresponding air outlet.
- In one form of this aspect of the present invention, the wave flanks are substantially planar with louvers in a significant section of the wave flanks protruding from the plane of the flank. In a further form of this aspect of the present invention, the louvers have an angle of bending defining protrusions in a common direction from the wave flank plane, with the angle of bending of each louver being substantially the same. In a still further form, the louvers have an angle of bending defining protrusions in opposite directions from the wave flank plane whereby half of the louvers are sloped in the direction of cooling air flow and the other half are sloped against the cooling air direction, the angle of bending of each louver being substantially the same. In yet another further form, a connector has edges bent at an angle corresponding to angle of bending of the louvers, with the connector being substantially in the center of the section of the wave flanks having louvers.
- In a further form of this aspect of the present invention, the surface of the wave flanks is substantially flat.
- In another form of this aspect of the present invention, the wave flanks have a curved contour between the air inlet and air outlet.
- In another aspect of the present invention, a corrugated rib for a heat exchanger core is provided, where the corrugated rib is formed by rolling a longitudinally extending metal sheet and includes wave flanks defining cooling flow channels therebetween. The wave flanks have an oblique slope angle relative to the edges of the metal sheet and further include louvers protruding from the plane of the wave flanks.
- In one form of this aspect of the present invention, the surfaces of the wave flanks are substantially flat.
- In another form of this aspect of the present invention, the surfaces of the wave flanks are a contour consisting of a single arc.
- In still another form of this aspect of the present invention, the louvers are fields of louvers arranged generally parallel and close to each other.
- In still another aspect of the present invention, a heat exchanger core oriented with the front substantially vertical and facing cooling air flow is provided, the core including at least one row of flat tubes through which a liquid or gas flows and corrugated ribs arranged in between the flat tubes. The ribs have wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of the core and an air outlet on the rear of the core. The air inlet of each channel is aligned relative to the corresponding air outlet with the wave flanks between such inlets and outlets having a contour consisting of a single arc.
- In one form of this aspect of the present invention, louvers protrude from the surface of the wave flank in a significant section of the wave flanks.
-
FIG. 1 illustrates a portion of a heat exchanger incorporating the present invention; -
FIG. 2 illustrates the previously described aspect of one prior art heat exchanger; -
FIG. 3 is a perspective view of one embodiment of a corrugated rib according to the present invention; -
FIG. 4 is a plan view illustrating the orientation of the wave flanks of a corrugated rib relative to the adjacent tube according to the present invention; -
FIG. 5 is a perspective view of the corrugated rib and tube ofFIG. 4 ; -
FIG. 6 is a plan view illustrating the orientation of the wave flanks of a corrugated rib relative to the adjacent tube according to another embodiment of the present invention; -
FIG. 7 is a perspective view of the corrugated rib and tube ofFIG. 6 ; -
FIG. 8 is a side view of a corrugated rib according to another aspect of the present invention; -
FIGS. 9-12 illustrate alternate orientations of louvers in wave flanks along cross-sectional line A-A ofFIG. 8 ; -
FIG. 13 is similar toFIGS. 9-13 , illustrating an orientation of louvers in contoured wave flanks; -
FIGS. 14-16 are exemplary cross-sectional profiles of corrugated ribs which may be used according to the present invention; -
FIGS. 17-18 illustrate one manner of producing corrugated ribs with flat wave flanks according to one aspect of the present invention; -
FIG. 19 illustrates a corrugated rib formed according toFIGS. 17-18 ; -
FIGS. 20-21 illustrate one manner of producing corrugated ribs with contoured wave flanks according to one aspect of the present invention; -
FIG. 22 illustrates a corrugated rib formed according toFIGS. 20-21 ; and -
FIG. 23 is a top view of a corrugated rib according to yet another aspect of the present invention, with contoured flanks and aligned inlets and outlets. - A
heat exchanger 30 according to the present invention is illustrated inFIG. 1 . Theheat exchanger 30 is set up perpendicular to the flow direction of the cooling air (arrow 32) as is prescribed in most applications in the automotive field or elsewhere, and includes acollecting tank 36 with an inlet oroutlet connector 40 through which liquid or hot charge air flows in order to flow through a series offlat tubes 44 to the other collecting tank (not shown) lying on the opposite end offlat tube 44. - The gas or liquid flowing in the
flat tubes 44 is cooled by cooling air flowing throughcorrugated ribs 46 firmly bonded to the flat tubes 44 (e.g., by soldering) to together form the heat exchanger grate or core such as is generally well known in the art. - In accordance with the present invention, the
corrugated ribs 46 includewave flanks 50 which definechannels 52 therebetween, with thechannels 52 being laid out so that thecorresponding air inlet 54 into each of thechannels 52 is offset relative to thecorresponding air outlet 56 from each of thechannels 52. As illustrated in the embodiment ofFIG. 1 , in which theflat tubes 44 are vertically oriented, theair inlets 54 are higher than the level of theair outlets 56 for eachchannel 52. It should also be appreciated that other variants would be within the scope of the present invention. For example, the air outlets could lie higher than the associated air inlets or, in a heat exchanger having horizontally oriented tubes and ribs, the air outlets may lie to the right or left of the associated inlets (offset by 60 as indicated inFIGS. 4 and 6 ). - With an
offset 60 betweeninlets 54 andoutlets 56 such as shown inFIGS. 4 and 6 , each air molecule, if possible, may advantageously come into contact with thewave flanks 50 of thecorresponding channel 52 so that a higher efficiency of heat exchange is present. Inefficient horizontal flow through thechannels 52 or flow without deflection, as generally can occur in the prior art, is avoided. It should also be appreciated that the size of the offset is influenced by the size of the angle between the wave direction and vertical or horizontal, as well as the depth of the heat exchanger grate. With a deeper heat exchanger grate at the same angle, the offset is larger than in a flatter heat exchanger grate. -
Louvers 64 may also be advantageously provided in the wave flanks 50 for heat exchange efficiency whereby air turbulence may be improved without undesirably increasing the pressure loss of the cooling air stream. As illustrated inFIG. 3 , thelouvers 64 extend over a significant section of the wave flanks 50. The heat exchange rate between the liquid flowing inflat tubes 44 or, for example, a strongly heated charge air with the cooling air may thereby be significantly raised. The louvers may be variously configured as desired, depending upon the application. - Where
louvers 64 are provided such as illustrated, it should be appreciated that thechannels 52 will not be discrete, whereby an air particle entering achannel 52 through itsinlet 54 may not emerge through the correspondingoutlet 56. As a result, at least one part of the cooling air can be distributed to adjacent channels before it leaves the heat exchanger core again at the outlets. - The louvers may be advantageously configured to protrude from the plane of the wave flanks 50 running with the slope angle, with the heat exchanger core arranged with a slope to the direction of flow of the cooling air.
- It should be appreciated that the depicted
heat exchanger 10 may be designed with or without a tube bottom. - Since the
corrugated ribs 46 in the depictedFIGS. 4-5 embodiment generally represent a parallelogram in top view, an angle a is produced between the ends of theflat tubes 44 running perpendicular to the vertical 66 and between the plane of the indicated tube bottom 68 (seeFIG. 1 ) running perpendicular to vertical 66 and thecorrugated rib 46. Should this angle a be perceived as a disadvantage, it can be avoided by appropriate choice of the position and contour of the separation cut during production of thecorrugated ribs 46, which is done from a metal sheet. -
FIGS. 4 and 5 show views of aflat tube 44 over its broad side with acorrugated rib 46 with obliquely running wave flanks 50 resulting in the indicated offset 60 betweenair inlets 54 andair outlets 56. The angle β1 between thewave direction 70 and the vertical 66 is indicated inFIG. 4 , with vertical 66 coinciding with the trend of the edges offlat tube 44. Thewave direction 70 is always the direction perpendicular to the wave flanks 50. - The angle β2 between the
wave direction 70 and the horizontal 60 is present when a heat exchanger grate or core is arranged vertically with theflat tubes 44 extending horizontally (it being understood that the direction of flow of the cooling air is generally horizontal. In these cases as well, the cooling air stream naturally impinges on one of the narrow sides offlat tube 44 to then flow through thecorrugated ribs 46. -
FIGS. 6 and 7 differ fromFIGS. 4 and 5 in that the wave flanks 50 of theribs 46 c are provided with a rounding or acontour 80. -
FIG. 8 shows a perspective view of thecorrugated rib 46 in which the trend of a cross-section A-A is indicated, andFIGS. 9-13 show different variants oflouvers 64 in wave flanks 50 according to cross-section A-A. Aconnector 84 is provided between thelouvers 64 arranged in two fields, theedges 85 ofconnector 84 being bent, with the angle of bending corresponding to theset angle 86 of theindividual louvers 64. Thelouvers 64 can either be all aligned in one direction (e.g.,FIGS. 11, 13 ) or in fields with opposite directions of alignment (e.g.,FIGS. 9-10 ). As another alternative,FIG. 12 shows a variant in which thelouvers 64 alternately protrude from theplane 88 of wave flanks 50. -
FIG. 13 shows a variant with acontour 80 in the wave flanks 50 also provided withlouvers 64, as well as an offset 60 a betweenair inlet 54 andair outlet 56. Depending on the choice ofcontour 80, different alignment angles 86 can also be used with thealignment angle 86 being, for example, changed along thecontour 80 to become larger or smaller. While louvers have been used in the art, to the knowledge of the applicant they have thus far not been suggested for use with a slope angle and/or with corrugations of the corrugated rib running with a contour. -
FIGS. 14-16 illustrate alternate cross-sectional profiles ofcorrugated ribs 46 which may be produced by rolling. Such profiles may include, for example, the provision of theedges 90 with alarger bending radius 92 than the other bending edge. This may simplify production by rolling, with loosening of thecorrugated rib 46 from the roller die facilitated by such profile. -
FIGS. 17-18 show production ofcorrugated ribs 46 with flat wave flanks 50 having a slope relative to the edges.Rolls corresponding oblique toothing 103. In order to form thelouvers 64, theroller elements like parts 104 that are assembled into a roller body. Each disk-like part 104 on theupper roll 100 cooperates with acorresponding part 104 on thelower roll 101 in the fashion of a blade in order to producelouvers 64 and their alignment from theplane 88 of wave flanks 50 (e.g.,FIG. 19 ). Thus, it should be appreciated thatcorrugated ribs 46 according to the present invention may be produced cost-effectively on a roller machine (commonly used for large series production) with relatively high advance speed. Such roller machines may include a roll pair in a so-called roll stand and have an appropriate drive unit. -
FIGS. 20 and 21 also illustrate rolling, in this case formingcorrugated ribs 46 c with acontour 80 of the wave flanks 50 such as previously described. The contour of theoblique toothing 103 a must naturally correspond to the contour on the wave flanks 50, and emergence of the finishedcorrugated ribs 46 from the roll pair must be provided with an angle β corresponding to the slope angle. In front of this oblique exit, a region of thecorrugated rib 46 is pushed together (tightened) before being brought to the desired division length L (seeFIG. 3 ) at an angle corresponding to the slope angle. -
FIG. 23 shows a top view of acorrugated rib 46 with an arc-like contour 80 a of wave flanks 50, as proposed in an independent alternative solution, with no offset 60 between theair inlets 54 and theair outlets 56. Louvers 64 (not shown) may also be provided in this version), and the particular shape of thecontour 80 a may be selected depending upon the particular technical considerations of the heat exchanger and expected environment. It should be appreciated that thecorrugated rib 46 of this variant also offers many of the advantages of the invention including enhanced heat exchange between the media as a result of a lengthened path for the cooling air. - It should thus be appreciated that the present invention may offer improved efficiency of heat exchange for the common situation in which the heat exchanger core may be mounted perpendicular to the direction of air flow. According to one aspect of the invention, the channels of the corrugated ribs are formed by the corrugated flanks so that the corresponding air inlet into each of the channels is arranged offset relative to the corresponding air outlet from each of the channels. In vertical flat tubes with corrugated ribs according to the invention the air can no longer flow horizontally through the channels, as in the prior art, since it is diverted by the vertical offset. If, on the other hand, horizontal flat tubes with corrugated ribs in-between are chosen according to the invention, the horizontally-flowing cooling air is diverted according to the offset in the horizontal. In either case, each air particle is forced to intensive contact with the wave flanks. Further, increased heat exchange intensity is achieved as a result of a longer connection path between the corrugated rib and the broad sides of the flat tubes, causing more intense heat exchange because it runs obliquely to the longitudinal axis of the flat tube.
- Still other aspects, objects, and advantages of the present invention can be obtained from a study of the specification, the drawings, and the appended claims. It should be understood, however, that the present invention could be used in alternate forms where less than all of the objects and advantages of the present invention and preferred embodiment as described above would be obtained.
Claims (13)
1. A heat exchanger core, said heat exchanger core being oriented with the front substantially vertical and facing cooling air flow, said core comprising:
at least one row of flat tubes through which a liquid or gas flows;
corrugated ribs arranged in between said flat tubes, said ribs having wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of said core and an air outlet on the rear of said core;
wherein said wave flanks are at an angle β which is oblique to said core front and rear whereby said air inlet of each channel is offset relative to the corresponding air outlet.
2. The heat exchanger core of claim 1 , wherein said wave flanks are substantially planar, and further comprising louvers in a significant section of the wave flanks protruding from the plane of the flank.
3. The heat exchanger core of claim 2 , wherein said louvers have an angle of bending defining protrusions in a common direction from the wave flank plane, said angle of bending of each louver being substantially the same.
4. The heat exchanger core of claim 2 , wherein said louvers have an angle of bending defining protrusions in opposite directions from the wave flank plane whereby half of the louvers are sloped in the direction of cooling air flow and the other half are sloped against the cooling air direction, said angle of bending of each louver being substantially the same.
5. The heat exchanger core of claim 2 , further comprising a connector having edges bent at an angle corresponding to angle of bending of said louvers, said connector being substantially in the center of the section of the wave flanks having louvers.
6. The heat exchanger core of claim 1 , wherein the surface of the wave flanks is substantially flat.
7. The heat exchanger core of claim 1 , wherein said wave flanks have a curved contour between said air inlet and air outlet.
8. A corrugated rib for a heat exchanger core, said corrugated rib being formed by rolling a longitudinally extending metal sheet and comprising wave flanks defining cooling flow channels therebetween, whereby said wave flanks have an oblique slope angle relative to the edges of the metal sheet and further comprising louvers protruding from the plane of the wave flanks.
9. The corrugated rib of claim 8 , wherein the surfaces of the wave flanks are substantially flat.
10. The corrugated rib of claim 8 , wherein the surfaces of the wave flanks are a contour consisting of a single arc.
11. The corrugated rib of claim 8 , wherein the louvers comprise fields of louvers arranged generally parallel and close to each other.
12. A heat exchanger core, said heat exchanger core being oriented with the front substantially vertical and facing cooling air flow, said core comprising:
at least one row of flat tubes through which a liquid or gas flows;
corrugated ribs arranged in between said flat tubes, said ribs having wave flanks defining channels, each channel being for cooling air flow between an air inlet on the front of said core and an air outlet on the rear of said core;
wherein said air inlet of each channel is aligned relative to the corresponding air outlet with the wave flanks between such inlets and outlets having a contour consisting of a single arc.
13. The method of claim 12 , further comprising louvers protruding from the surface of the wave flank in a significant section of the wave flanks.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004012427A DE102004012427A1 (en) | 2004-03-13 | 2004-03-13 | Heat exchanger network and corrugated fin |
DE102004012427.2 | 2004-03-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050199378A1 true US20050199378A1 (en) | 2005-09-15 |
Family
ID=34813695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/078,849 Abandoned US20050199378A1 (en) | 2004-03-13 | 2005-03-11 | Heat exchanger core and corrugated rib |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050199378A1 (en) |
EP (1) | EP1574801A3 (en) |
DE (1) | DE102004012427A1 (en) |
Cited By (7)
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US20060278382A1 (en) * | 2005-06-10 | 2006-12-14 | Bhatti Mohinder S | Laminated evaporator with optimally configured plates to align incident flow |
US20070246202A1 (en) * | 2006-04-25 | 2007-10-25 | Yu Wen F | Louvered fin for heat exchanger |
US7540320B1 (en) * | 2006-02-10 | 2009-06-02 | Thomas Middleton Semmes | High efficiency conditioning air apparatus |
CN101975492A (en) * | 2010-10-19 | 2011-02-16 | 广东美的制冷设备有限公司 | Novel heat exchanging device |
US20130319648A1 (en) * | 2011-02-17 | 2013-12-05 | Behr Gmbh & Co. Kg | Fin for a heat exchanger |
US20170108277A1 (en) * | 2014-05-28 | 2017-04-20 | Rbc Green Energy Ii, Llc | Air-Cooled Heat Exchange System |
EP3575728A1 (en) | 2018-05-30 | 2019-12-04 | Valeo Autosystemy SP. Z.O.O. | A core of a heat exchanger comprising corrugated fins |
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DE502005007801D1 (en) * | 2005-12-03 | 2009-09-10 | Modine Mfg Co | Heat transfer rib, manufacturing process and heat exchanger |
US20070240865A1 (en) | 2006-04-13 | 2007-10-18 | Zhang Chao A | High performance louvered fin for heat exchanger |
DE102007031675A1 (en) * | 2007-07-06 | 2009-01-08 | Behr Gmbh & Co. Kg | Heat exchanger, has flat current-conducting units for certain medium, and corrugated ribs with wave crests, which are arranged opposite to depth direction of exchanger in inclined manner |
DE102009021177A1 (en) | 2009-05-13 | 2010-11-18 | Behr Gmbh & Co. Kg | Fin for heat exchanger, has rib plate with multiple rib flanks extending substantially in geometric flow direction, where multiple through holes are formed with greater height than rib flanks |
US20120055657A1 (en) * | 2010-09-02 | 2012-03-08 | George Moser | Compact heat exchanger |
DE102011050275A1 (en) * | 2011-05-11 | 2012-11-15 | Gea Energietechnik Gmbh | Air-dried dry cooler |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060278382A1 (en) * | 2005-06-10 | 2006-12-14 | Bhatti Mohinder S | Laminated evaporator with optimally configured plates to align incident flow |
US7267162B2 (en) * | 2005-06-10 | 2007-09-11 | Delphi Technologies, Inc. | Laminated evaporator with optimally configured plates to align incident flow |
US7540320B1 (en) * | 2006-02-10 | 2009-06-02 | Thomas Middleton Semmes | High efficiency conditioning air apparatus |
US20070246202A1 (en) * | 2006-04-25 | 2007-10-25 | Yu Wen F | Louvered fin for heat exchanger |
CN101975492A (en) * | 2010-10-19 | 2011-02-16 | 广东美的制冷设备有限公司 | Novel heat exchanging device |
US20130319648A1 (en) * | 2011-02-17 | 2013-12-05 | Behr Gmbh & Co. Kg | Fin for a heat exchanger |
US20170108277A1 (en) * | 2014-05-28 | 2017-04-20 | Rbc Green Energy Ii, Llc | Air-Cooled Heat Exchange System |
EP3575728A1 (en) | 2018-05-30 | 2019-12-04 | Valeo Autosystemy SP. Z.O.O. | A core of a heat exchanger comprising corrugated fins |
WO2019229180A1 (en) | 2018-05-30 | 2019-12-05 | Valeo Autosystemy Sp. Z O.O. | A core of a heat exchanger comprising corrugated fins |
Also Published As
Publication number | Publication date |
---|---|
EP1574801A3 (en) | 2006-05-17 |
EP1574801A2 (en) | 2005-09-14 |
DE102004012427A1 (en) | 2005-09-29 |
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