US20110139414A1 - Low Pressure Drop Fin with Selective Micro Surface Enhancement - Google Patents
Low Pressure Drop Fin with Selective Micro Surface Enhancement Download PDFInfo
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- US20110139414A1 US20110139414A1 US12/636,843 US63684309A US2011139414A1 US 20110139414 A1 US20110139414 A1 US 20110139414A1 US 63684309 A US63684309 A US 63684309A US 2011139414 A1 US2011139414 A1 US 2011139414A1
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- spoilers
- fins
- long
- legs
- air
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- 230000001939 inductive effect Effects 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- F28F2215/00—Fins
- F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities
Definitions
- a vast number of heat transfer applications e.g. residential HVAC, electronics, etc., operate under very low thermal heat transfer potential. In other words, the temperature difference between the refrigerant and the stream of air entering the heat exchanger is not great. Additionally, the size and power of the fan propelling the stream of air through a heat exchanger is often limited by a number of constraints, e.g. power usage, noise, space, etc. For example, in a laptop computer, the size of the fan must be minimized to fit within the space constraints of the casing, and the power of the fan must be minimized to avoid draining the battery or producing undesirable noise. In these applications, the performance of the air fins in transferring heat between the refrigerant and the stream of air is critical. Air fins generally include louvers to increase heat transfer, but those louvers also create an undesirable pressure drop in the stream of air.
- each of the legs of the fins defines a plurality of main spoilers disposed between the front long louvers and the back edges for inducing turbulence in the stream of air with each of the main spoilers having a spoiler height in the range of 50 to 90 percent of the long louver height and each of the main spoilers having a spoiler length in the range of 10 to 35 percent of the long louver length.
- the potential for heat transfer between the refrigerant and the stream of air decreases as the air flows downstream through the heat exchanger because the temperature difference between the refrigerant and the stream of air is reduced.
- the long louvers have more potential for heat transfer than the main spoilers because the long louvers turn and induce turbulence to the stream of air, whereas the main spoilers function mainly to induce turbulence in the air. Therefore, the long louvers are disposed upstream, where the temperature difference between the stream of air and the refrigerant is greatest, of the main spoilers.
- the upstream long louvers perform the majority of the heat transfer between the stream of air and the refrigerant.
- long louvers create a large pressure drop in the stream of air flowing through the heat exchanger. Therefore, it is undesirable to have long louvers extend the entire length of the air fin.
- the smaller main spoilers are disposed downstream of the long louvers to induce turbulence in the stream of air to increase the air's heat transfer potential without compromising the overall pressure drop of the heat exchanger. This allows for a greater quantity of air to flow through the upstream long louvers of the fins and improves the overall efficiency of the heat exchanger assembly.
- FIG. 6 is a front view, partially cut away for an alternate embodiment of a fin having micro-louvers disposed in a staggered arrangement.
- the heat exchanger assembly 20 includes a first manifold 24 and a second manifold 26 extending in spaced and parallel relationship with one another.
- the first manifold 24 defines a plurality of first tube slots 28 being spaced from one another.
- the second manifold 26 defines a plurality of second tube slots 30 being spaced from each other and aligned with the first tube slots 28 .
- a plurality of tubes 32 extend in spaced and parallel relationship to one another between the aligned first and second tube slots 28 , 30 .
- Each of the tubes 32 has a cross-section defining flat sides 34 interconnected by a round front 36 and a round back 38 .
- Each of the tubes 32 defines a fluid passage 40 for conveying refrigerant between the manifolds 24 , 26 .
- a plurality of fins 42 are disposed between adjacent ones of the tubes 32 for transferring heat between the refrigerant in the fluid passages 40 of the tubes 32 and the stream of air 22 .
- the fins 42 have a fin height H F .
- the fins 42 extend continuously between a front edge 44 adjacent to the round front 36 of the tubes 32 and back edge 46 adjacent to the round back 38 of the tubes 32 . In other words, the front edge 44 of the fins 42 is upstream of the back edge 46 of the fins 42 .
- Each of the fins 42 includes a plurality of legs 48 extending transversely between the adjacent tubes 32 .
- the fins 42 also include a plurality of end portions 50 engaging the flat sides 34 of the adjacent tubes 32 .
- legs 48 and end portions 50 of the fins 42 present a serpentine path extending between the first and second manifolds 24 , 26 .
- adjacent legs 48 of the fins 42 are connected by end portions 50 engaging opposite ones of the flat sides 34 of the adjacent tubes 32 .
- each of the legs 48 of the fins 42 presents a plurality of front long louvers 52 disposed between the front and back edges 44 , 46 .
- the front long louvers 52 function to turn the stream of air 22 .
- the front long louvers 52 convey the stream of air 22 through the legs 48 of the air fins 42 . This keeps the stream of air 22 in the heat exchanger longer and gives the stream of air 22 more time to receive heat from or dispense heat to the refrigerant in the tubes 32 , depending on the application of the heat exchanger assembly 20 .
- the long louvers 52 , 54 have a long louver height H L , which is preferably in the range of 60 to 90 percent of the fin height H F , and the long louvers 52 , 54 have a long louver length L L , which is preferably in the range of 0.7 to 1.5 mm.
- each of the legs 48 of the fins 42 presents a plurality of main spoilers 56 , 58 , 60 disposed between the front long louvers 52 and the back edge 46 , i.e. downstream of the front long louvers 52 .
- the main spoilers 56 , 58 , 60 serve to interrupt the airflow and induce turbulence in the stream of air 22 , but do not substantially turn the air as the front long louvers 52 do.
- some air might be conveyed cross-stream between the legs 48 of the fins 42 through the main spoilers 56 , 58 , 60 , the majority of the air is flows straight through the heat exchanger assembly 20 .
- Each of the main spoilers 56 , 58 , 60 has a spoiler height H s preferably in the range of 50 to 90 percent of the long louver height H L
- each of the main spoilers 56 , 58 , 60 has a spoiler length L S preferably in the range of 10 to 35 percent of the long louver length L L .
- a small spoiler length L S compared to the long louver length L L keeps the airflow blockage due to the main spoilers 56 , 58 , 60 small, thereby achieving good heat transfer with a low pressure drop penalty.
- each of the legs 48 of the fins 42 is symmetrical.
- all of the embodiments include back long louvers 54 disposed between the main spoilers 56 , 58 , 60 and the back edge 46 of the air fin 42 .
- some of the embodiments include back spoilers 62 disposed between the back long louvers 54 and the back edge 46 of the air fin 42 .
- the symmetry of the fins 42 is primarily for manufacturing purposes because symmetrical fins 42 can be made less expensively than non-symmetrical fins 42 . It should be appreciated that the main spoilers 56 , 58 , 60 could extend from the front long louvers 52 to the back edge 46 , or the air fin 42 could be flat between the main spoilers 56 , 58 , 60 and the back edge 46 .
- each of the legs 48 of the fins 42 presents a plurality of front spoilers 64 adjacent to the front edge 44 for interrupting the flow and inducing turbulence in the stream of air 22 .
- the delta-wing, or triangular, shaped front spoilers 64 are best shown in FIGS. 2 and 3 .
- the delta wings are disposed over the entire fin height H F .
- the width and height of the delta-wings is comparable to the spoiler length L S .
- the front spoilers 64 are most useful when used in a cold environment. In cold environments, frost has a tendency of building up on the front edge 44 of the fins 42 when there is large heat transfer rate between the air and the refrigerant at that front edge 44 .
- the frost can block the stream of air 22 from flowing through the heat exchanger, which drastically reduces the efficiency of the heat exchanger.
- the front spoilers 64 disposed upstream of the front long louvers 52 ensure that the maximum rate of heat transfer takes place slightly downstream of the front edge 44 of the fins 42 to prevent the frost from building up on the front edge 44 of the fins 42 .
- the efficiency of the heat exchanger assembly 20 might be reduced in some operating conditions, i.e. in warm environments, heat exchanger assemblies 20 having front spoilers 64 can be used in a wider variety of operating conditions.
- the main spoilers 56 , 58 , 60 of the first embodiment are micro-louvers 56 .
- the second embodiment shown in FIG. 4 b , is similar to the first embodiment, but the delta-wing shaped front spoilers 64 of the first embodiment are replaced with front micro-louvers 64 , shaped similarly to the main spoilers 56 , 58 , 60 .
- the front micro-louvers 64 function similar to the delta-wing shaped front spoilers 64 of the first embodiment in that they interrupt the airflow and induce turbulence in the air, but leave the majority of the heat transfer to the long louvers 52 , 54 disposed between the micro-louvers 64 and the main spoilers 56 , 58 , 60 , which are also shown as micro-louvers 56 .
- the third embodiment shown in FIG. 4 c , has front long louvers 52 disposed upstream of the main spoilers 56 , 58 , 60 , shown as micro-louvers 56 . Because the third embodiment does not have front spoilers 64 , airflow is steered in the cross stream direction by the front and back long louvers 52 , 54 . Airflow is mostly straight in the mid section.
- the fourth embodiment shown in FIG. 4 d , shows the main spoilers 56 , 58 , 60 as being micro-louvers 56 .
- the micro-louvers 56 of the fourth embodiment extend outwardly on both sides of the legs 48 of the fins 42 .
- the fifth embodiment shown in FIG. 4 e , shows the main spoilers 56 , 58 , 60 as being semi-cylindrical bumps 58 .
- the semi-cylindrical bumps 58 extend outwardly on both sides of the legs 48 of the fins 42 .
- the sixth embodiment shown in FIG. 4 f , shows the main spoilers 56 , 58 , 60 as being triangular notches 60 .
- the triangular notches 60 extend outwardly from the leg 48 on opposite sides of the leg 48 .
- main spoilers 56 , 58 , 60 may take any number of shapes, not just those shown in FIGS. 4 a - f .
- the main spoilers 56 , 58 , 60 can be disposed both upstream or downstream of at least one front long louver 52 . Additionally, each of the main spoilers 56 , 58 , 60 must have a spoiler height H S in the range of 50 to 90 percent of the long louver height H L , and each of the main spoilers 56 , 58 , 60 must have a spoiler length L S in the range of 10 to 35 percent of the long louver length L L .
- the bulk of the heat transfer between the refrigerant and the stream of air 22 occurs at the front long louvers 52 .
- the rest of the fin 42 is utilized for pressure drop management with some heat transfer augmentation through the main spoilers 56 , 58 , 60 downstream of the front long louvers 52 .
- FIG. 5 shows the stream of air 22 flowing through the heat exchanger assembly 20 of the first embodiment.
- the air flows straight between the legs 48 of the fins 42 past the micro-louvers or the delta-wing shaped front spoilers 64 .
- the stream of air 22 flows downstream between the legs 42 , most of the air is turned by the front long louvers 52 between the legs 42 .
- the stream of air 22 then straightens out as it passes the main spoilers 56 , 58 , 60 .
- the back long louvers 54 which are optional as explained above, turn the stream of air 22 again between the legs 42 .
- the stream of air 22 once again straightens out when it passes the delta-wing shaped back spoilers 62 .
- the micro-louvers 56 can alternately be disposed in a staggered arrangement.
- the staggered arrangement can be easily manufactured and provide for a large number of micro-louvers 56 with a smaller pressure drop penalty.
- the staggered micro-louvers 56 are disposed close to the end portions 50 of the fins 42 , which have the a higher heat transfer potential than the middle of the fins 42 .
Abstract
The assembly includes a heat exchanger assembly including a plurality of tubes extending between first and second manifolds. A plurality of fins extend back and forth between and long the tubes in a continuous patch and define a plurality of legs extending between the tubes. Each of the legs includes a plurality of front long louvers for conveying a stream of air through the legs. Each of the legs further defines a plurality of main spoilers between the front long louvers and the back edges of the legs for inducing turbulence in the stream of air with each of the main spoilers having a spoiler height in the range of 50 to 90 percent of the long louver height and each of the main spoilers having a spoiler length in the range of 10 to 35 percent of the long louver length.
Description
- 1. Field of the Invention
- A heat exchanger assembly, and more specifically, a heat exchanger assembly including louvered air fins for transferring heat between a refrigerant and a stream of air.
- 2. Description of the Prior Art
- A vast number of heat transfer applications, e.g. residential HVAC, electronics, etc., operate under very low thermal heat transfer potential. In other words, the temperature difference between the refrigerant and the stream of air entering the heat exchanger is not great. Additionally, the size and power of the fan propelling the stream of air through a heat exchanger is often limited by a number of constraints, e.g. power usage, noise, space, etc. For example, in a laptop computer, the size of the fan must be minimized to fit within the space constraints of the casing, and the power of the fan must be minimized to avoid draining the battery or producing undesirable noise. In these applications, the performance of the air fins in transferring heat between the refrigerant and the stream of air is critical. Air fins generally include louvers to increase heat transfer, but those louvers also create an undesirable pressure drop in the stream of air.
- U.S. Patent Application Publication No. 2008/0121385, to In Chuil Kim (hereinafter referred to as Kim '385) shows a heat exchanger assembly for transferring heat between a refrigerant and a stream of air. Kim '385 includes first and second manifolds spaced from one another. A plurality of tubes extend in spaced relationship with one another between the first and second manifolds for conveying the refrigerant between the first and second manifolds. A plurality of fins are disposed between adjacent tubes for transferring heat between the tubes and the stream of air. Each of the fins has a front edge and a back edge and presents a plurality of legs extending transversely between the adjacent tubes. Each of the legs of the fins defines a plurality of front long louvers disposed between the front and back edges for conveying the stream of air through the legs of the air fins with each of the long louvers having a long louver height and a long louver length.
- The invention provides for such a heat exchanger assembly and wherein each of the legs of the fins defines a plurality of main spoilers disposed between the front long louvers and the back edges for inducing turbulence in the stream of air with each of the main spoilers having a spoiler height in the range of 50 to 90 percent of the long louver height and each of the main spoilers having a spoiler length in the range of 10 to 35 percent of the long louver length.
- The potential for heat transfer between the refrigerant and the stream of air decreases as the air flows downstream through the heat exchanger because the temperature difference between the refrigerant and the stream of air is reduced. The long louvers have more potential for heat transfer than the main spoilers because the long louvers turn and induce turbulence to the stream of air, whereas the main spoilers function mainly to induce turbulence in the air. Therefore, the long louvers are disposed upstream, where the temperature difference between the stream of air and the refrigerant is greatest, of the main spoilers. The upstream long louvers perform the majority of the heat transfer between the stream of air and the refrigerant. Although long louvers are very effective at transferring heat between the stream of air and the refrigerant, they come at a cost. Namely, long louvers create a large pressure drop in the stream of air flowing through the heat exchanger. Therefore, it is undesirable to have long louvers extend the entire length of the air fin. The smaller main spoilers are disposed downstream of the long louvers to induce turbulence in the stream of air to increase the air's heat transfer potential without compromising the overall pressure drop of the heat exchanger. This allows for a greater quantity of air to flow through the upstream long louvers of the fins and improves the overall efficiency of the heat exchanger assembly.
- Other advantages of the present invention will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
-
FIG. 1 is a perspective view of a heat exchanger assembly; -
FIG. 2 is a perspective view, partially cut away a first embodiment of a fin with louvers and one tube of a heat exchanger assembly; -
FIG. 3 is a front view, partially cut away of a first embodiment of a fin; -
FIGS. 4 a through f are cross-sectional views of the first through sixth embodiments of the louvers and spoilers of the fins; -
FIG. 5 is a cross-sectional view showing the flow of air over the louvers and spoilers according to one of the embodiment ofFIG. 4 a; and -
FIG. 6 is a front view, partially cut away for an alternate embodiment of a fin having micro-louvers disposed in a staggered arrangement. - Referring to the Figures, wherein like numerals indicate corresponding parts throughout the several views, a
heat exchanger assembly 20 for transferring heat between a refrigerant and a stream ofair 22 is generally shown inFIG. 1 . - Referring to
FIG. 1 , theheat exchanger assembly 20 includes a first manifold 24 and a second manifold 26 extending in spaced and parallel relationship with one another. The first manifold 24 defines a plurality of first tube slots 28 being spaced from one another. The second manifold 26 defines a plurality of second tube slots 30 being spaced from each other and aligned with the first tube slots 28. A plurality oftubes 32 extend in spaced and parallel relationship to one another between the aligned first and second tube slots 28, 30. Each of thetubes 32 has a cross-section definingflat sides 34 interconnected by around front 36 and a round back 38. Each of thetubes 32 defines afluid passage 40 for conveying refrigerant between the manifolds 24, 26. - A plurality of
fins 42, generally indicated, are disposed between adjacent ones of thetubes 32 for transferring heat between the refrigerant in thefluid passages 40 of thetubes 32 and the stream ofair 22. Thefins 42 have a fin height HF. Thefins 42 extend continuously between afront edge 44 adjacent to theround front 36 of thetubes 32 andback edge 46 adjacent to the round back 38 of thetubes 32. In other words, thefront edge 44 of thefins 42 is upstream of theback edge 46 of thefins 42. Each of thefins 42 includes a plurality oflegs 48 extending transversely between theadjacent tubes 32. Thefins 42 also include a plurality ofend portions 50 engaging theflat sides 34 of theadjacent tubes 32. Together, thelegs 48 andend portions 50 of thefins 42 present a serpentine path extending between the first and second manifolds 24, 26. In other words,adjacent legs 48 of thefins 42 are connected byend portions 50 engaging opposite ones of theflat sides 34 of theadjacent tubes 32. - In all of the embodiments of the subject invention, shown in
FIGS. 4 a-f, each of thelegs 48 of thefins 42 presents a plurality of frontlong louvers 52 disposed between the front andback edges air 22, the frontlong louvers 52 function to turn the stream ofair 22. In other words, the frontlong louvers 52 convey the stream ofair 22 through thelegs 48 of the air fins 42. This keeps the stream ofair 22 in the heat exchanger longer and gives the stream ofair 22 more time to receive heat from or dispense heat to the refrigerant in thetubes 32, depending on the application of theheat exchanger assembly 20. Thelong louvers long louvers - In all of the embodiments of the subject invention, shown in
FIGS. 4 a-f, each of thelegs 48 of thefins 42 presents a plurality ofmain spoilers long louvers 52 and theback edge 46, i.e. downstream of the frontlong louvers 52. Themain spoilers air 22, but do not substantially turn the air as the frontlong louvers 52 do. In other words, although some air might be conveyed cross-stream between thelegs 48 of thefins 42 through themain spoilers heat exchanger assembly 20. Each of themain spoilers main spoilers main spoilers - As shown in
FIGS. 4 a-f, each of thelegs 48 of thefins 42 is symmetrical. In other words, all of the embodiments include backlong louvers 54 disposed between themain spoilers back edge 46 of theair fin 42. Additionally, some of the embodiments includeback spoilers 62 disposed between the backlong louvers 54 and theback edge 46 of theair fin 42. The symmetry of thefins 42 is primarily for manufacturing purposes becausesymmetrical fins 42 can be made less expensively than non-symmetricalfins 42. It should be appreciated that themain spoilers long louvers 52 to theback edge 46, or theair fin 42 could be flat between themain spoilers back edge 46. - In the first embodiment, shown in
FIG. 4 a, each of thelegs 48 of thefins 42 presents a plurality offront spoilers 64 adjacent to thefront edge 44 for interrupting the flow and inducing turbulence in the stream ofair 22. The delta-wing, or triangular, shapedfront spoilers 64 are best shown inFIGS. 2 and 3 . The delta wings are disposed over the entire fin height HF. The width and height of the delta-wings is comparable to the spoiler length LS. Thefront spoilers 64 are most useful when used in a cold environment. In cold environments, frost has a tendency of building up on thefront edge 44 of thefins 42 when there is large heat transfer rate between the air and the refrigerant at thatfront edge 44. The frost can block the stream ofair 22 from flowing through the heat exchanger, which drastically reduces the efficiency of the heat exchanger. Thefront spoilers 64 disposed upstream of the frontlong louvers 52 ensure that the maximum rate of heat transfer takes place slightly downstream of thefront edge 44 of thefins 42 to prevent the frost from building up on thefront edge 44 of thefins 42. Although the efficiency of theheat exchanger assembly 20 might be reduced in some operating conditions, i.e. in warm environments,heat exchanger assemblies 20 havingfront spoilers 64 can be used in a wider variety of operating conditions. Themain spoilers - The second embodiment, shown in
FIG. 4 b, is similar to the first embodiment, but the delta-wing shapedfront spoilers 64 of the first embodiment are replaced withfront micro-louvers 64, shaped similarly to themain spoilers front spoilers 64 of the first embodiment in that they interrupt the airflow and induce turbulence in the air, but leave the majority of the heat transfer to thelong louvers main spoilers micro-louvers 56. - The third embodiment, shown in
FIG. 4 c, has frontlong louvers 52 disposed upstream of themain spoilers micro-louvers 56. Because the third embodiment does not havefront spoilers 64, airflow is steered in the cross stream direction by the front and backlong louvers - Like the third embodiment, the fourth embodiment, shown in
FIG. 4 d, shows themain spoilers micro-louvers 56 of the fourth embodiment extend outwardly on both sides of thelegs 48 of thefins 42. - The fifth embodiment, shown in
FIG. 4 e, shows themain spoilers semi-cylindrical bumps 58. The semi-cylindrical bumps 58 extend outwardly on both sides of thelegs 48 of thefins 42. - The sixth embodiment, shown in
FIG. 4 f, shows themain spoilers triangular notches 60. Thetriangular notches 60 extend outwardly from theleg 48 on opposite sides of theleg 48. - It should be appreciated that the
main spoilers FIGS. 4 a-f. Themain spoilers long louver 52. Additionally, each of themain spoilers main spoilers - In applications where the maximum thermal potential for total heat dissipation is small, it is paramount that total airflow through the
heat exchanger assembly 20 be high. With fan power and noise constraints, airflow can be high only when the overall pressure drop of the heat exchanger is kept to a minimum. Havingfront spoilers 64, as shown inFIGS. 4 a-c, allows the flow a better entrance condition into the core of the heat exchanger with a low pressure drop but with some heat transfer enhancement as compared to an un-louvered surface. In this fashion high pressure drop is expended locally only where heat transfer potential is maximum without compromising the tendency of frost to build up on thefront edges 44 of thefins 42. The bulk of the heat transfer between the refrigerant and the stream ofair 22 occurs at the frontlong louvers 52. The rest of thefin 42 is utilized for pressure drop management with some heat transfer augmentation through themain spoilers long louvers 52. -
FIG. 5 shows the stream ofair 22 flowing through theheat exchanger assembly 20 of the first embodiment. As shown, the air flows straight between thelegs 48 of thefins 42 past the micro-louvers or the delta-wing shapedfront spoilers 64. As the stream ofair 22 flows downstream between thelegs 42, most of the air is turned by the frontlong louvers 52 between thelegs 42. The stream ofair 22 then straightens out as it passes themain spoilers long louvers 54, which are optional as explained above, turn the stream ofair 22 again between thelegs 42. The stream ofair 22 once again straightens out when it passes the delta-wing shaped backspoilers 62. Although not shown inFIG. 5 , it should be appreciated that each of thefront spoilers 64, frontlong louvers 52,main spoilers long louvers 54, and backspoilers 62 induces turbulence into the stream ofair 22. The micro-louver segment can be disposed anywhere symmetrically or asymmetrically within thefins 42. - As shown in
FIG. 6 , the micro-louvers 56 can alternately be disposed in a staggered arrangement. The staggered arrangement can be easily manufactured and provide for a large number ofmicro-louvers 56 with a smaller pressure drop penalty. Additionally, thestaggered micro-louvers 56 are disposed close to theend portions 50 of thefins 42, which have the a higher heat transfer potential than the middle of thefins 42. - While the invention has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (18)
1. A heat exchanger assembly for transferring heat between a refrigerant and a stream of air, comprising:
a first manifold;
a second manifold spaced from said first manifold;
a plurality of tubes extending in spaced relationship with one another between said first and second manifolds for conveying the refrigerant between said first and second manifolds;
a plurality of fins disposed between adjacent ones of said tubes for transferring heat between the refrigerant in said tubes and the stream of air;
each of said fins having a front edge and a back edge and including a plurality of legs extending transversely between said adjacent tubes;
each of said legs of said fins defining a plurality of front long louvers disposed between said front and back edges for conveying the stream of air through said legs of said air fins with each of said long louvers having a long louver height and a long louver length; and
each of said legs of said fins defining a plurality of main spoilers disposed between said front long louvers and said back edges for inducing turbulence in the stream of air with each of said main spoilers having a spoiler height in the range of 50 to 90 percent of said long louver height and each of said main spoilers having a spoiler length in the range of 10 to 35 percent of said long louver length.
2. The assembly as set forth in claim 1 wherein said main spoilers are micro-louvers.
3. The assembly as set forth in claim 1 wherein each of said legs of said air fins presents a plurality of front spoilers disposed between said front edge and said front long louvers for inducing turbulence in the stream of air.
4. The assembly as set forth in claim 3 wherein each of said front spoilers extends outwardly from said legs and has a triangular shape.
5. The assembly as set forth in claim 3 wherein each of said legs of said air fins defines a plurality of back spoilers disposed adjacent to said back edge and a plurality of back long louvers disposed between said micro-louvers and said back spoilers.
6. The assembly as set forth in claim 1 wherein each of said legs of said fins has a fin height and said long louver height is in the range of 50 to 90 percent of said fin height.
7. The assembly as set forth in claim 1 wherein said long louver length is in the range of 0.7 to 1.5 mm.
8. The assembly as set forth in claim 1 wherein said spoiler length is in the range of 0.15 to 0.4 mm.
9. The assembly as set forth in claim 1 wherein each of said front long louvers extends diagonally outwardly from said legs of said fins.
10. The assembly as set forth in claim 1 wherein said first and second manifolds extend in spaced and parallel relationship with one another.
11. The assembly as set forth in claim 10 wherein said first manifold defines a plurality of first tube slots spaced from one another and said second manifold defines a plurality of second tube slots spaced from one another and aligned with said first tube slots.
12. The assembly as set forth in claim 11 wherein each of said tubes has a cross-section presenting flat sides interconnected by a round front and a round back.
13. The assembly as set forth in claim 12 wherein said tubes extend in spaced and parallel relationship with one another between said aligned first and second tube slots of said first and second manifolds.
14. The assembly as set forth in claim 1 wherein each of said tubes defines a fluid passage for conveying the refrigerant between said manifolds.
15. The assembly as set forth in claim 1 where said main spoilers are disposed in a staggered arrangement.
16. The assembly as set forth in claim 1 wherein said main spoilers are semi-cylindrical bumps.
17. The assembly as set forth in claim 1 wherein said main spoilers are triangular notches.
18. A heat exchanger assembly for transferring heat between a refrigerant and a stream of air, comprising:
a first manifold and a second manifold extending in spaced and parallel relationship with one another;
said first manifold defining a plurality of first tube slots being spaced from each other;
said second manifold defining a plurality of second tube slots being spaced from each other and aligned with said first tube slots;
a plurality of tubes having a cross-section presenting flat sides interconnected by a round front and a round back and extending in spaced and parallel relationship with one another between said aligned first and second tube slots for establishing fluid communication between said first and second manifolds;
each of said tubes defining a fluid passage for conveying the refrigerant between said manifolds;
a plurality of fins disposed between adjacent ones of said tubes for transferring heat between the refrigerant in said fluid passages of said tubes and the stream of air;
each of said fins including a plurality of legs with each leg having a fin height and each leg extending transversely between said adjacent tubes and each of said fins including a plurality of end portions extending along said flat sides of said adjacent tubes to present a serpentine path between said first and second manifolds;
each of said legs of said fins having a front edge adjacent said round front of said tubes and a back edge adjacent said round back of said tubes;
each of said legs of said fins presenting a plurality of front spoilers adjacent to said front edge and a plurality of back spoilers adjacent to said back edge for inducing turbulence in the stream of air;
each of said front and back spoilers extending outwardly from said legs and having a conical shape;
each of said legs of said fins presenting a plurality of front long louvers spaced from said front spoilers and a plurality of back long louvers spaced from said back spoilers for conveying the stream of air through said legs of said fins;
each of said legs of said fins presenting a plurality of main spoilers disposed between said front long louvers and said back long louvers for inducing turbulence in the stream of air;
each of said long louvers having a long louver height in the range of 60 to 90 percent of said fin height;
each of said main spoilers having a spoiler height in the range of 50 to 90 percent of said long louver height;
each of said long louvers having a long louver length in the range of 0.7 to 1.5 mm; and
each of said main spoilers having a spoiler length in the range of 10 to 35 percent of said long louver length.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/636,843 US20110139414A1 (en) | 2009-12-14 | 2009-12-14 | Low Pressure Drop Fin with Selective Micro Surface Enhancement |
EP10193609.4A EP2336701B1 (en) | 2009-12-14 | 2010-12-03 | Low pressure drop fin with selective micro surface enhancement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/636,843 US20110139414A1 (en) | 2009-12-14 | 2009-12-14 | Low Pressure Drop Fin with Selective Micro Surface Enhancement |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110139414A1 true US20110139414A1 (en) | 2011-06-16 |
Family
ID=43733941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/636,843 Abandoned US20110139414A1 (en) | 2009-12-14 | 2009-12-14 | Low Pressure Drop Fin with Selective Micro Surface Enhancement |
Country Status (2)
Country | Link |
---|---|
US (1) | US20110139414A1 (en) |
EP (1) | EP2336701B1 (en) |
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US20130306272A1 (en) * | 2012-05-18 | 2013-11-21 | Mark Johnson | Heat exchanger, and method for transferring heat |
US20150377558A1 (en) * | 2013-02-01 | 2015-12-31 | Halla Visteon Climate Control Corp. | Heat exchange system |
US20170055370A1 (en) * | 2015-08-20 | 2017-02-23 | Cooler Master Co., Ltd. | Liquid-cooling heat dissipation device |
US9958215B2 (en) | 2013-03-15 | 2018-05-01 | Dana Canada Corporation | Heat transfer surface with nested tabs |
US20180299205A1 (en) * | 2015-10-12 | 2018-10-18 | Charbel Rahhal | Heat exchanger for residential hvac applications |
US10247481B2 (en) | 2013-01-28 | 2019-04-02 | Carrier Corporation | Multiple tube bank heat exchange unit with manifold assembly |
US10337799B2 (en) | 2013-11-25 | 2019-07-02 | Carrier Corporation | Dual duty microchannel heat exchanger |
US20190360755A1 (en) * | 2015-12-16 | 2019-11-28 | Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd. | Heat exchanger coil and heat exchanger having the same |
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US9671176B2 (en) * | 2012-05-18 | 2017-06-06 | Modine Manufacturing Company | Heat exchanger, and method for transferring heat |
US10247481B2 (en) | 2013-01-28 | 2019-04-02 | Carrier Corporation | Multiple tube bank heat exchange unit with manifold assembly |
US20150377558A1 (en) * | 2013-02-01 | 2015-12-31 | Halla Visteon Climate Control Corp. | Heat exchange system |
US9927179B2 (en) * | 2013-02-01 | 2018-03-27 | Hanon Systems | Heat exchange system |
US9958215B2 (en) | 2013-03-15 | 2018-05-01 | Dana Canada Corporation | Heat transfer surface with nested tabs |
US10337799B2 (en) | 2013-11-25 | 2019-07-02 | Carrier Corporation | Dual duty microchannel heat exchanger |
US10111362B2 (en) * | 2015-08-20 | 2018-10-23 | Cooler Master Co., Ltd. | Liquid-cooling heat dissipation device |
US20170055370A1 (en) * | 2015-08-20 | 2017-02-23 | Cooler Master Co., Ltd. | Liquid-cooling heat dissipation device |
US20180299205A1 (en) * | 2015-10-12 | 2018-10-18 | Charbel Rahhal | Heat exchanger for residential hvac applications |
US20190360755A1 (en) * | 2015-12-16 | 2019-11-28 | Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd. | Heat exchanger coil and heat exchanger having the same |
US10739076B2 (en) * | 2015-12-16 | 2020-08-11 | Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd. | Heat exchanger coil and heat exchanger having the same |
EP3392596B1 (en) * | 2015-12-16 | 2021-06-09 | Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd. | Heat exchanger core and heat exchanger having same |
US11162742B2 (en) * | 2016-12-01 | 2021-11-02 | Modine Manufacturing Company | Air fin for a heat exchanger |
US20230042424A1 (en) * | 2020-01-03 | 2023-02-09 | Valeo Systemes Thermiques | Tube heat exchanger having spacers |
Also Published As
Publication number | Publication date |
---|---|
EP2336701B1 (en) | 2018-10-24 |
EP2336701A2 (en) | 2011-06-22 |
EP2336701A3 (en) | 2017-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DELPHI TECHNOLOGIES, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GHOSH, DEBASHIS;ACRE, JAMES A.;SIGNING DATES FROM 20091211 TO 20091215;REEL/FRAME:023816/0873 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |