EP2869015B1 - Method of using asymmetric corrugated fins with louvers - Google Patents
Method of using asymmetric corrugated fins with louvers Download PDFInfo
- Publication number
- EP2869015B1 EP2869015B1 EP13191548.0A EP13191548A EP2869015B1 EP 2869015 B1 EP2869015 B1 EP 2869015B1 EP 13191548 A EP13191548 A EP 13191548A EP 2869015 B1 EP2869015 B1 EP 2869015B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- edge portion
- louvers
- trailing edge
- fluid flow
- heat exchanger
- Prior art date
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 9
- 239000012530 fluid Substances 0.000 claims description 14
- 238000005728 strengthening Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 1
Images
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
- 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
Definitions
- the present invention relates to a method of using a fluid flow guide member of a heat exchanger.
- Tube and fin heat exchangers typically comprise parallel flat tubes wherein flows the fluid and, corrugated louvered fins arranged between the tubes and across which flows an air stream.
- the louvered fins are made in a metal strip fanfold creating panels substantially parallel and extending between the tubes from a leading edge with louvers to a trailing edge with inversed louvers. Furthermore, the fins are provided with slit louvers forcing the air stream to deviate and to traverse the panels.
- the symmetrical fins usually comprise an upstream series of louvers, arranged in the leading half of the strip and, a downstream series of louvers arranged in the trailing half. While the upstream louvers deviate the air flow in one direction, the trailing louvers deviate it in the opposite direction.
- a fin made from a corrugated metallic strip according to the prior art is known from EP 2 657 637 .
- the width of the fin extends along a transversal axis from a first edge to a second edge, the first edge portion of the fin being provided with slit louvers adapted to deviate the flow.
- the second edge portion is provided with protrusions free of slit louvers.
- the guide member is made from a corrugated metallic strip, the width of which extending along a transversal axis from a leading edge to a trailing edge.
- the leading edge portion of the guide member is provided with slit louvers adapted to deviate the flow.
- the trailing edge portion is free of slit louvers and provided with strengthening ribs.
- the ribs are not slit and are formed by corrugating the trailing edge portion of the strip.
- the ribs have a trapezoidal cross section.
- the width of the strip is divided between the leading edge portion and the trailing edge portion along the transversal axis. In an embodiment both portion have equal length while, in another specific embodiment, the leading edge portion is longer than the trailing edge portion. In still another embodiment, the leading edge portion is shorter than the trailing edge portion.
- the invention is also related to a method of using the fluid flow guide member in a heat exchanger having tubes between which are arranged a plurality of fluid flow guide members.
- a brazed air-fluid heat exchanger 10 comprises two parallel tanks 12 extending along a normal axis N, a plurality of longitudinal L flat tubes 14 extending between the tanks 12 and corrugated fins 16 arranged between the tubes 14.
- the fins 16 are made of a metal strip 18 fanfold so to form flat panels 20 substantially parallel to each other's, and only joining along the fold lines 22 brazed to the tubes 14.
- the heat exchanger 10 has a large front face 24 perpendicular to a transversal axis T.
- an air flow F crosses the heat exchanger 10 flowing between the fins 16 from the leading edge 26 to a trailing edge 28.
- the fins 16 have a leading portion 30 followed by a trailing portion 32.
- the leading portion 30 is provided with slit louvers 34 oriented to deviate and skew the air flow F of the transversal axis T and, the trailing portion 32 is provided with ribs 36 extending between the fold lines 22.
- a first embodiment is represented on figure 3 where the leading edge 26 is on the left of the figure.
- the leading portion 30 and the trailing portion 32 have equal transversal length, approximately half the width W of the strip 18.
- the louvers 34 are represented by a series of parallel skewed lines and the ribs 36, on the trailing portion 32, have trapezoidal profiles.
- the ribs 36 are not slit and consequently the air flow that enters the trailing portion 32 remains between the same two fins until exiting by the trailing edge 28. While many alternatives can be made, it appears that a good dimensional compromise resides in an inter-louvers distance 38 of approximately 1 mm and in a trapezoidal base width of approximately 3mm for the ribs, each of the three sides of the rib having approximately the same dimension.
- leading edge portion 30, containing louvers 34 is much wider/longer along the transversal axis T than the trailing portion 32.
- the ribs do not need to be trapezoidal and other shapes such as square, semi-circular or triangular are also possible.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
- The present invention relates to a method of using a fluid flow guide member of a heat exchanger.
- Tube and fin heat exchangers typically comprise parallel flat tubes wherein flows the fluid and, corrugated louvered fins arranged between the tubes and across which flows an air stream. The louvered fins are made in a metal strip fanfold creating panels substantially parallel and extending between the tubes from a leading edge with louvers to a trailing edge with inversed louvers. Furthermore, the fins are provided with slit louvers forcing the air stream to deviate and to traverse the panels. The symmetrical fins usually comprise an upstream series of louvers, arranged in the leading half of the strip and, a downstream series of louvers arranged in the trailing half. While the upstream louvers deviate the air flow in one direction, the trailing louvers deviate it in the opposite direction. These symmetrical fins theoretically don't curl in production. However if one side is stronger than the other, the metal strip will curl toward the weaker side. The curl makes it for all intents and purposes impossible to handle in a production environment.
- A fin made from a corrugated metallic strip according to the prior art is known from
EP 2 657 637 . The width of the fin extends along a transversal axis from a first edge to a second edge, the first edge portion of the fin being provided with slit louvers adapted to deviate the flow. The second edge portion is provided with protrusions free of slit louvers. - Accordingly, it is an object of the present invention to provide a method of using a fluid flow guide member of a heat exchanger, adapted to be traversed by fluid flow. The guide member is made from a corrugated metallic strip, the width of which extending along a transversal axis from a leading edge to a trailing edge. The leading edge portion of the guide member is provided with slit louvers adapted to deviate the flow. The trailing edge portion is free of slit louvers and provided with strengthening ribs. The ribs are not slit and are formed by corrugating the trailing edge portion of the strip.
- In a particular embodiment, the ribs have a trapezoidal cross section.
- The width of the strip is divided between the leading edge portion and the trailing edge portion along the transversal axis. In an embodiment both portion have equal length while, in another specific embodiment, the leading edge portion is longer than the trailing edge portion. In still another embodiment, the leading edge portion is shorter than the trailing edge portion.
- The invention is also related to a method of using the fluid flow guide member in a heat exchanger having tubes between which are arranged a plurality of fluid flow guide members.
- The present invention is now described by way of example with reference to the accompanying figures where:
-
Figure 1 is an air-fluid heat exchanger having fins as per the invention. -
Figure 2 is an isometric view of corrugated fins offigure 1 . -
Figure 3 is a cross-section of the fins as per a first embodiment. -
Figure 4 is a cross-section of the fins as per a second embodiment. - As per
figure 1 , a brazed air-fluid heat exchanger 10 comprises twoparallel tanks 12 extending along a normal axis N, a plurality of longitudinal Lflat tubes 14 extending between thetanks 12 andcorrugated fins 16 arranged between thetubes 14. Thefins 16 are made of ametal strip 18 fanfold so to formflat panels 20 substantially parallel to each other's, and only joining along the fold lines 22 brazed to thetubes 14. As visible on the figure, theheat exchanger 10 has a largefront face 24 perpendicular to a transversal axis T. - In operation, an air flow F crosses the
heat exchanger 10 flowing between thefins 16 from the leadingedge 26 to a trailingedge 28. - As represented in
figure 2 , between the twoedges fins 16 have a leadingportion 30 followed by a trailingportion 32. The leadingportion 30 is provided withslit louvers 34 oriented to deviate and skew the air flow F of the transversal axis T and, the trailingportion 32 is provided withribs 36 extending between the fold lines 22. - A first embodiment is represented on
figure 3 where the leadingedge 26 is on the left of the figure. The leadingportion 30 and the trailingportion 32 have equal transversal length, approximately half the width W of thestrip 18. Thelouvers 34 are represented by a series of parallel skewed lines and theribs 36, on the trailingportion 32, have trapezoidal profiles. Theribs 36 are not slit and consequently the air flow that enters the trailingportion 32 remains between the same two fins until exiting by the trailingedge 28. While many alternatives can be made, it appears that a good dimensional compromise resides in aninter-louvers distance 38 of approximately 1 mm and in a trapezoidal base width of approximately 3mm for the ribs, each of the three sides of the rib having approximately the same dimension. - In second embodiment represented by
figure 4 , the leadingedge portion 30, containinglouvers 34, is much wider/longer along the transversal axis T than the trailingportion 32. - Other alternatives, not represented, can be made. The ribs do not need to be trapezoidal and other shapes such as square, semi-circular or triangular are also possible.
- The following references have been utilized in this description.
- 10
- heat exchanger
- 12
- tank
- 14
- tube
- 16
- fins - fluid flow guide member
- 18
- metal strip
- 20
- panels
- 22
- fold line
- 24
- front face
- 26
- leading edge
- 28
- trailing edge
- 30
- leading portion
- 32
- trailing portion
- 34
- louvers
- 36
- strengthening ribs
- 38
- inter-louvers distance
- N
- normal axis
- T
- transversal axis
- F
- air flow
Claims (5)
- Method of using a fluid flow guide member (16) of a heat exchanger (10), which is traversed by fluid flow (F) in operation of the heat exchanger (10), the guide member (16) being made from a corrugated metallic strip (18), the width (W) of which extending along a transversal axis (T) from a leading edge (26) to a trailing edge (28), wherein the fluid flow (F) flows from the leading edge (26) to the trailing edge (28) in operation of the heat exchanger (10), wherein- in the leading edge portion (30) of the guide member (16) slit louvers (34) are provided adapted to deviate the flow (F),- the trailing edge portion (32) is free of slit louvers,- strengthening ribs (36) are arranged in the trailing edge portion (32),- the ribs (36) are formed by corrugating the trailing edge portion (32) of the strip (18).
- Method according to claim 1, wherein the ribs (36) have a trapezoidal cross section.
- Method according to claims 1 or 2, wherein the leading edge portion (30) and the trailing edge portion (32) are of equal length.
- Method according to claims 1 to 3, wherein the leading edge portion (30) and the trailing edge portion (32) are of unequal length.
- Method of using a fluid flow guide member (16), according to any of the preceding claims, in a heat exchanger (10) having tubes (14) between which are arranged a plurality of said fluid flow guide members (16).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13191548.0A EP2869015B1 (en) | 2013-11-05 | 2013-11-05 | Method of using asymmetric corrugated fins with louvers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13191548.0A EP2869015B1 (en) | 2013-11-05 | 2013-11-05 | Method of using asymmetric corrugated fins with louvers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2869015A1 EP2869015A1 (en) | 2015-05-06 |
EP2869015B1 true EP2869015B1 (en) | 2017-09-20 |
Family
ID=49518802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13191548.0A Active EP2869015B1 (en) | 2013-11-05 | 2013-11-05 | Method of using asymmetric corrugated fins with louvers |
Country Status (1)
Country | Link |
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EP (1) | EP2869015B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3099238B1 (en) | 2019-07-25 | 2021-10-01 | Valeo Systemes Thermiques | Heat exchanger in particular for a motor vehicle and method of manufacturing such a heat exchanger |
FR3099240B1 (en) | 2019-07-25 | 2021-08-06 | Valeo Systemes Thermiques | Heat exchanger in particular for a motor vehicle and method of manufacturing such a heat exchanger |
FR3099239B1 (en) | 2019-07-25 | 2021-10-01 | Valeo Systemes Thermiques | Heat exchanger in particular for a motor vehicle and method of manufacturing such a heat exchanger |
FR3100058B1 (en) | 2019-08-23 | 2022-03-25 | Valeo Systemes Thermiques | Heat exchanger in particular for a motor vehicle and method of manufacturing such a heat exchanger |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020189799A1 (en) * | 2001-06-13 | 2002-12-19 | Tatsuo Ozaki | Heat exchanger |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3068761B2 (en) * | 1994-12-21 | 2000-07-24 | シャープ株式会社 | Heat exchanger |
JP3942210B2 (en) * | 1996-04-16 | 2007-07-11 | 昭和電工株式会社 | Heat exchanger, room air conditioner and car air conditioner using this heat exchanger |
JP2007232246A (en) * | 2006-02-28 | 2007-09-13 | Denso Corp | Heat exchanger |
JP5141840B2 (en) * | 2011-01-21 | 2013-02-13 | ダイキン工業株式会社 | Heat exchanger and air conditioner |
AU2012208120A1 (en) * | 2011-01-21 | 2013-08-01 | Daikin Industries, Ltd. | Heat exchanger and air conditioner |
-
2013
- 2013-11-05 EP EP13191548.0A patent/EP2869015B1/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020189799A1 (en) * | 2001-06-13 | 2002-12-19 | Tatsuo Ozaki | Heat exchanger |
Also Published As
Publication number | Publication date |
---|---|
EP2869015A1 (en) | 2015-05-06 |
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