EP3399268A1 - Heat exchanger - Google Patents
Heat exchanger Download PDFInfo
- Publication number
- EP3399268A1 EP3399268A1 EP15912102.9A EP15912102A EP3399268A1 EP 3399268 A1 EP3399268 A1 EP 3399268A1 EP 15912102 A EP15912102 A EP 15912102A EP 3399268 A1 EP3399268 A1 EP 3399268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wave
- concaves
- convexes
- lines
- shapes
- 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.)
- Withdrawn
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- 239000012530 fluid Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 14
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
-
- 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0006—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the plate-like or laminated conduits being enclosed within a pressure vessel
-
- 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
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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
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
- F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
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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
- F28D1/05358—Assemblies of conduits connected side by side or with individual headers, e.g. section type radiators
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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
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
-
- 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
-
- 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
- F28F1/24—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 transversely
- F28F1/26—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 transversely the means being integral with the element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
Definitions
- the present disclosure relates to a heat exchanger and more specifically to a heat exchanger configured to perform heat exchange by flowing a fluid on the surface of a heat transfer member.
- wave-like concaves/ convexes are provided on a flat surface of a flat tubular heat exchange tube, such that the wave-like concaves/ convexes have a predetermined angle in a range of 10 degrees to 60 degrees to the main flow of the air and that the wave-like concaves/ convexes have crests and troughs to be symmetrically folded back on folding lines at predetermined intervals along the main flow of the air (as described in, for example, Patent Literature 1).
- the wave-like concaves/ convexes of this heat exchanger include crests (convexes) of continuing V shapes (or W shapes) and troughs (concaves) of continuing V shapes (or W shapes). Forming such wave-like concaves/ convexes causes a secondary flow along the surfaces of the wave-like concaves/ convexes to be generated, in addition to the main flow of the air and improves the heat exchange efficiency of the heat exchanger.
- a heat exchanger of the present disclosure mainly aims to increase the yield of a heat transfer member at a fixed amplitude of wave-like concaves/ convexes formed on the heat transfer member and to increase the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member.
- the heat exchanger of the present disclosure employs the following configuration.
- the present disclosure is directed to a heat exchanger configured to perform heat exchange by flowing a fluid on a surface of a heat transfer member.
- the heat transfer member includes wave-like concaves/ convexes of smooth curve lines provided on the surface exposed to the fluid.
- the wave-like concaves/ convexes are formed such that crest lines of continuing crests of wave and trough lines of continuing troughs of wave are formed in a shape of continuing V shapes in a horizontal direction, that bends of the V shapes form curve lines, and that a main flow of the fluid flows in a direction perpendicular to the V shapes.
- the wave-like concaves/ convexes of smooth curve lines are formed on the surface of the heat transfer member exposed to the fluid, such that the crest lines of continuing the crests of wave and the trough lines of continuing the troughs of wave are formed in the shape of continuing the V shapes in the horizontal direction and that the bends of the V shapes form curve lines, i.e., in a shape of continuing two V shapes in the horizontal direction to form a W shape and further continuing the W shapes.
- the wave-like concaves/ convexes are also formed such that the main flow of the fluid flows in the direction perpendicular to the V shapes (i.e., in the vertical direction).
- the crest lines and the trough lines reduces the stress concentration at the bends.
- this configuration increases the yield of the heat transfer member at a fixed amplitude of the wave-like concaves/ convexes of the heat transfer member and increases the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member.
- the wave-like concaves/ convexes of smooth curve lines are formed in the shape of continuing V shapes on the surface of the heat transfer member exposed to the fluid. This configuration enables a secondary flow along the surfaces of the wave-like concaves/ convexes of the heat transfer member to be generated, in addition to the main flow of the fluid and thereby improves the heat transfer efficiency of the heat exchanger.
- the crest line and the trough line may be formed by alternately arranging linear portions and arc portions in a continuous manner.
- This configuration increases the minimum radius of the bends, compared with a configuration that crest lines and trough lines are formed by sinusoidal curves.
- this configuration increases the yield of the heat transfer member at a fixed amplitude of the wave-like concaves/ convexes of the heat transfer member and increases the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member, compared with the configuration that the crest lines and the trough lines are formed by sinusoidal curves.
- the arc portion may have a radius that is equal to or larger than one fifth a length of the linear portion.
- the wave-like concaves/ convexes may be formed by alternately arranging straight lines and arcs in a continuous manner in cross section. This configuration increases the amplitude of the wave-like concaves/ convexes, compared with a configuration that the wave-like concaves/ convexes are formed by sinusoidal curves in cross section, and thereby further improves the heat transfer efficiency of the heat exchanger.
- the heat transfer member may be a heat exchange tube formed as a flat hollow pipe, and the wave-like concaves/ convexes may be formed on a flat surface of the heat exchange tube. Accordingly, the present disclosure may be applied to a fin-less heat exchanger.
- the heat transfer member may be a fin coupled with a heat exchange tube. Accordingly, the present disclosure may be applied to a corrugated fin heat exchanger or the like.
- Fig. 1 is a diagram illustrating the schematic configuration of a heat exchanger 20 according to one embodiment of the present disclosure.
- Fig. 2 is a side view illustrating the side view appearance of a plurality of heat exchange tubes 30 used for the heat exchanger 20 according to the embodiment.
- Fig. 3 is a sectional view illustrating a cross section taken on a line A-A shown in Fig. 1 .
- Fig. 4 is a diagram illustrating the schematic configuration of a heat exchanger 920 according to a comparative example.
- the heat exchanger 20 of the embodiment includes a plurality of heat exchange tubes 30 arranged in parallel such that their longitudinal directions correspond to a vertical direction, and a shell 50 configured to place the plurality of heat exchange tubes 30 therein.
- Each of the heat exchange tubes 30 is formed by press-forming a plate member made of a metal material (for example, stainless steel or aluminum) to be a flat hollow pipe in an approximately rectangular shape as a whole.
- the respective heat exchange tubes 30 are stacked such that their longitudinal directions correspond to the vertical direction and are joined with one another at respective contact points by brazing.
- An inflow port 31 formed at a vertically lower position near to a lower end of each heat exchange tube 30 is joined with an inflow port 31 of another heat exchange tube 30 adjacent thereto in the stack of the respective heat exchange tubes 30. This forms a connecting pipe 31a to make the respective inflow ports 31 communicate with one another.
- an outflow port 32 formed at a vertically upper position near to an upper end of each heat exchange tube 30 is joined with an outflow port 32 of another heat exchange tube 30 adjacent thereto in the stack of the respective heat exchange tubes 30.
- This configuration enables a first heat exchange medium such as water or oil to flow in from the inflow ports 31 of the respective heat exchange tubes 31, to flow vertically upward, and to flow out from the outflow ports 32 of the respective heat exchange tubes 30.
- the shell 50 is formed from a plate member made of a metal material (for example, stainless steel or aluminum) like the respective heat exchange tubes 30 and is configured as a case in an approximately rectangular parallelepiped shape to place therein the plurality of heat exchange tubes 30 that are coupled with one another by means of the connecting pipes 31a and 32a.
- a flow inlet 51 is formed in an upper portion of the shell 50, and a flow outlet 52 is formed in a lower portion of the shell 50.
- This configuration enables a second heat exchange medium such as the air or exhaust gas to flow in from the flow inlet 51 formed in the upper portion of the shell 50, to pass through between the plurality of heat exchange tubes 30 and to flow out from the flow outlet 52 formed in the lower portion of the shell 50.
- a plurality of wave-like concaves/ convexes 34 and 36 are formed by smooth curved surfaces on respective flat surfaces 33 and 35 of each of the heat exchange tubes 30.
- Fig. 1 illustrates the wave-like concaves/ convexes 34 provided on one flat surface 33 out of the respective flat surfaces 33 and 35 of the heat exchange tube 30, and wave-like concaves/ convexes 36 provided on the other flat surface 35 (flat surface on a rear side in Fig. 1 ) are shown in parentheses.
- the wave-like concaves/ convexes 34 and 36 are formed such that crest lines 34a and 36a of continuing crests of waves shown by a plurality of solid lines and trough lines 34b and 36b of continuing troughs of waves shown by a plurality of broken lines are arranged alternately in a shape of continuing V shapes (or W shapes) in a horizontal direction and that respective bends of the V shapes (or the W shapes) form curved lines.
- the crest of wave herein means the position of 90 degrees in a sinusoidal waveform of upward waves and downward waves, i.e. , the position of a maximum value (crest of the upward wave).
- the trough of wave here means the position of 270 degrees in the sinusoidal waveform of upward waves and downward waves, i.e. , the position of a minimum value (trough of the downward wave) .
- the second heat exchange medium passing through between the plurality of heat exchange tubes 30 flows in from the flow inlet 51 formed in the upper portion of the shell 50 and flows out from the flow outlet 52 formed in the lower portion of the shell 50. Accordingly, the main flow of the second heat exchange medium intersects with slant line portions of the V shapes (or the W shapes) of the crest lines 34a or 36a and the trough lines 34b or 36b at angles of the slant line portions (angles in a range of 30 degrees to 60 degrees) .
- each heat exchange tube 30 is configured such that the crest lines 34a and 36a and the trough lines 34b and 36b are formed in the shape of continuing V shapes (or W shapes) in the horizontal direction on the respective flat surfaces 33 and 35.
- This configuration enables a secondary flow effective for heat exchange to be generated, in addition to the main flow of the second heat exchange medium.
- the secondary flow herein means a flow along the surfaces of the wave-like concaves/ convexes 34 and 36 that is effective for heat exchange and is different from vortex flow and stirring flow.
- the crest lines 34a and 36a and the trough lines 34b and 36b are formed such that linear portions 34c and 36c formed by straight lines and arc portions 34d and 36d formed by arcs are arranged alternately in a continuous manner.
- the radius of the arc portions 34d and 36d is equal to or larger than one fifth the length of the linear portions 34c and 36c.
- each heat exchange tube 930 configured such that wave-like concaves/ convexes 934 and 936 provided on respective flat surfaces 933 and 935 of each heat exchange tube 930 have crest lines 934a and 936a and trough lines 934b and 936b with bends formed in a shape of continuing sharply-angled V shapes (or W shapes) in the horizontal direction.
- the stress concentration at the bends in the press-forming process increases with a decrease in minimum radius of the bends and also increases with an increase in amplitude of the wave-like concaves/ convexes 34 and 36.
- An increase in the stress concentration increases the possibility of cracking.
- the heat exchange tubes 30 of the embodiment have the higher yield in the press-forming process at a fixed amplitude of the wave-like concaves/ convexes 34 and 36 and have the larger amplitude of the wave-like concaves/ convexes 34 and 36 at a fixed yield in the press-forming process, compared with the heat exchange tubes 930 of the heat exchanger 920 of the comparative example.
- the wave-like concaves/ convexes 34 and 36 of the embodiment are formed such that straight lines and arcs are alternately arranged in a continuous manner in cross section as shown in Fig. 3 . Tops and bottoms of the arcs respectively form the crest lines 34a and 36a and the trough lines 34b and 36b.
- the configuration of the wave-like concaves/ convexes 34 and 36 by alternately arranging the straight lines and the arcs in a continuous manner in cross section increases the minimum radius of the crest and the trough of wave and accordingly increases the amplitude, compared with a configuration of sinusoidal curves in cross section.
- the wave-like concaves/ convexes 34 provided on one flat surface 33 and the wave-like concaves/ convexes 36 provided on the other flat surface 35 are arranged parallel to each other, such that the crest lines 34a of the wave-like concaves/ convexes 34 on one flat surface 33 are aligned with the trough lines 36b of the wave-like concaves/ convexes 36 on the other flat surface 35 and that the trough lines 34b of the wave-like concaves/ convexes 34 on one flat surface 33 are aligned with the crest lines 36a of the wave-like concaves/ convexes 36 on the other flat surface 35.
- the wave-like concaves/ convexes 34 and 36 provided on the respective flat surfaces 33 and 35 of each of the heat exchange tubes 30 are formed such that the crest lines 34a and 36a and the trough lines 34b and 36b are arranged alternately in the shape of continuing V shapes (or W shapes) in the horizontal direction and that the respective bends of the V shapes (or the W shapes) form the curved lines.
- This configuration increases the yield in the press-forming process at the fixed amplitude of the wave-like concaves/ convexes 34 and 36 and increases the amplitude of the wave-like concaves/ convexes 34 and 36 at the fixed yield in the press-forming process, compared with the heat exchange tubes 930 of the heat exchanger 920 of the comparative example configured such that the crest lines 934a and 936a and the trough lines 934b and 936b have the bends formed in the shape of continuing sharply-angled V shapes (or W shapes) in the horizontal direction. Additionally, the crest lines 34a and 36a and the trough lines 34b and 36b are formed by alternately arranging the linear portions 34c and 36c and arc portions 34d and 36d in a continuous manner.
- This configuration increases the minimum radius of the bends and reduces the stress concentration at the bends in the press-forming process, compared with the configuration that the crest lines and the trough lines are formed by sinusoidal curves. Accordingly, this configuration further increases the yield in the press-forming process at the fixed amplitude of the wave-like concaves/ convexes 34 and 36 and further increases the amplitude of the wave-like concaves/ convexes 34 and 36 at the fixed yield in the press-forming process.
- the configuration that the crest lines 34a and 36a and the trough lines 34b and 36b are formed in the shape of continuing V shapes (or W shapes) in the horizontal direction on the respective flat surfaces 33 and 35 of the heat exchange tube 30.
- This configuration enables the secondary flow effective for heat exchange to be generated, in addition to the main flow of the second heat exchange medium, on the surfaces of the wave-like concaves/ convexes 34 and 36 and provides the heat exchange having a high heat exchange efficiency.
- the configuration of the wave-like concaves/ convexes 34 and 36 by alternately arranging the straight lines and the arcs in a continuous manner in cross section increases the minimum radius of the crest and the trough of wave and accordingly increases the amplitude, compared with the configuration of sinusoidal curves in cross section.
- This configuration provides the heat exchanger having the higher heat exchange efficiency.
- the wave-like concaves/ convexes 34 and 36 have the crest lines 34a and 36a and the trough lines 34b and 36b formed by alternately arranging the linear portions 34c and 36c and the arc portions 34d and 36d in a continuous manner.
- the requirement is that the crest lines and the trough lines have curved V-shaped (or W-shaped) bends.
- the crest lines and the trough lines may be formed by alternately arranging S-shaped curves and arcs in a continuous manner, or the crest lines and the trough lines may be formed by continuing sinusoidal curves.
- the wave-like concaves/ convexes 34 and 36 are formed by alternately arranging the straight lines and the arcs in a continuous manner in cross section.
- the wave-like concaves/ convexes 34 and 36 may be formed by alternately arranging S-shaped curves and arcs in a continuous manner in cross section or may be formed by continuing sinusoidal curves in cross section.
- the first heat exchange medium and the second heat exchange medium form opposed flows.
- the first heat exchange medium and the second heat exchange medium may form cross flows, or one or both of the first heat exchange medium and the second heat exchange medium may form a bypass flow.
- the embodiment describes the application of the present disclosure to the heat exchange tubes in the fin-less heat exchanger 20.
- the present disclosure may, however, be applied to a fin in a corrugated fin heat exchanger.
- the fin may be configured such that wave-like concaves/ convexes of smooth curve lines are formed by alternately arranging crest lines of continuing V shapes (or W shapes) in the horizontal direction and trough lines of continuing V shapes (or W shapes) in the horizontal direction, that bends of the V shapes (or W shapes) form curved lines, and that the main flow of a fluid flows in the fin in an perpendicular direction of the V shapes.
- the technique of the disclosure is preferably applicable to the manufacturing industries of the heat exchanger and so on.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
- This is a national phase application of
PCT/JP2015/086562 filed December 28, 2015 - The present disclosure relates to a heat exchanger and more specifically to a heat exchanger configured to perform heat exchange by flowing a fluid on the surface of a heat transfer member.
- In a proposed configuration of a heat exchanger, wave-like concaves/ convexes are provided on a flat surface of a flat tubular heat exchange tube, such that the wave-like concaves/ convexes have a predetermined angle in a range of 10 degrees to 60 degrees to the main flow of the air and that the wave-like concaves/ convexes have crests and troughs to be symmetrically folded back on folding lines at predetermined intervals along the main flow of the air (as described in, for example, Patent Literature 1). The wave-like concaves/ convexes of this heat exchanger include crests (convexes) of continuing V shapes (or W shapes) and troughs (concaves) of continuing V shapes (or W shapes). Forming such wave-like concaves/ convexes causes a secondary flow along the surfaces of the wave-like concaves/ convexes to be generated, in addition to the main flow of the air and improves the heat exchange efficiency of the heat exchanger.
- PTL 1:
JP 2008-232592A - In the heat exchanger described above, it is desired to increase the amplitude (height difference between the crest and the trough) of the wave-like concaves/ convexes, with a view to improving the heat exchange efficiency. Increasing the amplitude of the wave-like concaves/ convexes, however, causes damages due to stress concentration at bends of the continuing V shapes (or W shapes) of the crests (convexes) and the troughs (concaves) of the wave-like concaves/ convexes in the process of press-forming the heat exchange tube. This reduces the yield of the heat exchange tube.
- A heat exchanger of the present disclosure mainly aims to increase the yield of a heat transfer member at a fixed amplitude of wave-like concaves/ convexes formed on the heat transfer member and to increase the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member.
- In order to achieve the above primary object, the heat exchanger of the present disclosure employs the following configuration.
- The present disclosure is directed to a heat exchanger configured to perform heat exchange by flowing a fluid on a surface of a heat transfer member. The heat transfer member includes wave-like concaves/ convexes of smooth curve lines provided on the surface exposed to the fluid. The wave-like concaves/ convexes are formed such that crest lines of continuing crests of wave and trough lines of continuing troughs of wave are formed in a shape of continuing V shapes in a horizontal direction, that bends of the V shapes form curve lines, and that a main flow of the fluid flows in a direction perpendicular to the V shapes.
- In the heat exchanger of this aspect, the wave-like concaves/ convexes of smooth curve lines are formed on the surface of the heat transfer member exposed to the fluid, such that the crest lines of continuing the crests of wave and the trough lines of continuing the troughs of wave are formed in the shape of continuing the V shapes in the horizontal direction and that the bends of the V shapes form curve lines, i.e., in a shape of continuing two V shapes in the horizontal direction to form a W shape and further continuing the W shapes. The wave-like concaves/ convexes are also formed such that the main flow of the fluid flows in the direction perpendicular to the V shapes (i.e., in the vertical direction). Forming the crest lines and the trough lines to have curved V-shaped bends (i.e., curved W-shaped bends) reduces the stress concentration at the bends. As a result, this configuration increases the yield of the heat transfer member at a fixed amplitude of the wave-like concaves/ convexes of the heat transfer member and increases the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member. In the heat exchanger of this aspect, the wave-like concaves/ convexes of smooth curve lines are formed in the shape of continuing V shapes on the surface of the heat transfer member exposed to the fluid. This configuration enables a secondary flow along the surfaces of the wave-like concaves/ convexes of the heat transfer member to be generated, in addition to the main flow of the fluid and thereby improves the heat transfer efficiency of the heat exchanger.
- In the heat exchanger of this aspect, the crest line and the trough line may be formed by alternately arranging linear portions and arc portions in a continuous manner. This configuration increases the minimum radius of the bends, compared with a configuration that crest lines and trough lines are formed by sinusoidal curves. As a result, this configuration increases the yield of the heat transfer member at a fixed amplitude of the wave-like concaves/ convexes of the heat transfer member and increases the amplitude of the wave-like concaves/ convexes of the heat transfer member at a fixed yield of the heat transfer member, compared with the configuration that the crest lines and the trough lines are formed by sinusoidal curves. In this case, the arc portion may have a radius that is equal to or larger than one fifth a length of the linear portion.
- In the heat exchanger of another aspect, the wave-like concaves/ convexes may be formed by alternately arranging straight lines and arcs in a continuous manner in cross section. This configuration increases the amplitude of the wave-like concaves/ convexes, compared with a configuration that the wave-like concaves/ convexes are formed by sinusoidal curves in cross section, and thereby further improves the heat transfer efficiency of the heat exchanger.
- In the heat exchanger of another aspect, the heat transfer member may be a heat exchange tube formed as a flat hollow pipe, and the wave-like concaves/ convexes may be formed on a flat surface of the heat exchange tube. Accordingly, the present disclosure may be applied to a fin-less heat exchanger. In the heat exchanger of still another aspect, the heat transfer member may be a fin coupled with a heat exchange tube. Accordingly, the present disclosure may be applied to a corrugated fin heat exchanger or the like.
-
-
Fig. 1 is a diagram illustrating the schematic configuration of a heat exchanger according to one embodiment of the present disclosure; -
Fig. 2 is a side view illustrating the side view appearance of a plurality of heat exchange tubes used for the heat exchanger according to the embodiment; -
Fig. 3 is a sectional view illustrating a cross section taken on a line A-A shown inFig. 1 , and -
Fig. 4 is a diagram illustrating the schematic configuration of a heat exchanger according to a comparative example. - The following describes some aspects of the disclosure with reference to embodiments.
-
Fig. 1 is a diagram illustrating the schematic configuration of aheat exchanger 20 according to one embodiment of the present disclosure.Fig. 2 is a side view illustrating the side view appearance of a plurality ofheat exchange tubes 30 used for theheat exchanger 20 according to the embodiment.Fig. 3 is a sectional view illustrating a cross section taken on a line A-A shown inFig. 1 .Fig. 4 is a diagram illustrating the schematic configuration of aheat exchanger 920 according to a comparative example. As shown inFig. 1 , theheat exchanger 20 of the embodiment includes a plurality ofheat exchange tubes 30 arranged in parallel such that their longitudinal directions correspond to a vertical direction, and ashell 50 configured to place the plurality ofheat exchange tubes 30 therein. - Each of the
heat exchange tubes 30 is formed by press-forming a plate member made of a metal material (for example, stainless steel or aluminum) to be a flat hollow pipe in an approximately rectangular shape as a whole. The respectiveheat exchange tubes 30 are stacked such that their longitudinal directions correspond to the vertical direction and are joined with one another at respective contact points by brazing. Aninflow port 31 formed at a vertically lower position near to a lower end of eachheat exchange tube 30 is joined with aninflow port 31 of anotherheat exchange tube 30 adjacent thereto in the stack of the respectiveheat exchange tubes 30. This forms a connecting pipe 31a to make therespective inflow ports 31 communicate with one another. Like theinflow ports 31, anoutflow port 32 formed at a vertically upper position near to an upper end of eachheat exchange tube 30 is joined with anoutflow port 32 of anotherheat exchange tube 30 adjacent thereto in the stack of the respectiveheat exchange tubes 30. This forms a connectingpipe 32a to make therespective outflow ports 32 communicate with one another. This configuration enables a first heat exchange medium such as water or oil to flow in from theinflow ports 31 of the respectiveheat exchange tubes 31, to flow vertically upward, and to flow out from theoutflow ports 32 of the respectiveheat exchange tubes 30. - The
shell 50 is formed from a plate member made of a metal material (for example, stainless steel or aluminum) like the respectiveheat exchange tubes 30 and is configured as a case in an approximately rectangular parallelepiped shape to place therein the plurality ofheat exchange tubes 30 that are coupled with one another by means of the connectingpipes 31a and 32a. Aflow inlet 51 is formed in an upper portion of theshell 50, and aflow outlet 52 is formed in a lower portion of theshell 50. This configuration enables a second heat exchange medium such as the air or exhaust gas to flow in from theflow inlet 51 formed in the upper portion of theshell 50, to pass through between the plurality ofheat exchange tubes 30 and to flow out from theflow outlet 52 formed in the lower portion of theshell 50. - A plurality of wave-like concaves/
convexes flat surfaces heat exchange tubes 30.Fig. 1 illustrates the wave-like concaves/convexes 34 provided on oneflat surface 33 out of the respectiveflat surfaces heat exchange tube 30, and wave-like concaves/convexes 36 provided on the other flat surface 35 (flat surface on a rear side inFig. 1 ) are shown in parentheses. The wave-like concaves/convexes crest lines trough lines heat exchange tubes 30 flows in from theflow inlet 51 formed in the upper portion of theshell 50 and flows out from theflow outlet 52 formed in the lower portion of theshell 50. Accordingly, the main flow of the second heat exchange medium intersects with slant line portions of the V shapes (or the W shapes) of thecrest lines trough lines heat exchange tube 30 is configured such that thecrest lines trough lines flat surfaces convexes - According to the embodiment, the
crest lines trough lines linear portions arc portions arc portions linear portions heat exchanger 920 of the comparative example ofFig. 4 configured such that wave-like concaves/convexes flat surfaces heat exchange tube 930 havecrest lines trough lines convexes heat exchange tubes 30 of the embodiment have the higher yield in the press-forming process at a fixed amplitude of the wave-like concaves/convexes convexes heat exchange tubes 930 of theheat exchanger 920 of the comparative example. - The wave-like concaves/
convexes Fig. 3 . Tops and bottoms of the arcs respectively form thecrest lines trough lines convexes - In the
heat exchange tube 30 of the embodiment, the wave-like concaves/ convexes 34 provided on oneflat surface 33 and the wave-like concaves/ convexes 36 provided on the otherflat surface 35 are arranged parallel to each other, such that thecrest lines 34a of the wave-like concaves/ convexes 34 on oneflat surface 33 are aligned with thetrough lines 36b of the wave-like concaves/ convexes 36 on the otherflat surface 35 and that thetrough lines 34b of the wave-like concaves/ convexes 34 on oneflat surface 33 are aligned with thecrest lines 36a of the wave-like concaves/ convexes 36 on the otherflat surface 35. - In the
heat exchanger 20 of the embodiment described above, the wave-like concaves/convexes flat surfaces heat exchange tubes 30 are formed such that thecrest lines trough lines convexes convexes heat exchange tubes 930 of theheat exchanger 920 of the comparative example configured such that thecrest lines trough lines crest lines trough lines linear portions arc portions convexes convexes - The configuration that the
crest lines trough lines flat surfaces heat exchange tube 30. This configuration enables the secondary flow effective for heat exchange to be generated, in addition to the main flow of the second heat exchange medium, on the surfaces of the wave-like concaves/convexes convexes - In the
heat exchanger 20 of the embodiment, the wave-like concaves/convexes crest lines trough lines linear portions arc portions - In the
heat exchanger 20 of the embodiment, the wave-like concaves/convexes convexes - In the
heat exchanger 20 of the embodiment, the first heat exchange medium and the second heat exchange medium form opposed flows. According to a modification, the first heat exchange medium and the second heat exchange medium may form cross flows, or one or both of the first heat exchange medium and the second heat exchange medium may form a bypass flow. - The embodiment describes the application of the present disclosure to the heat exchange tubes in the
fin-less heat exchanger 20. The present disclosure may, however, be applied to a fin in a corrugated fin heat exchanger. In this modification, the fin may be configured such that wave-like concaves/ convexes of smooth curve lines are formed by alternately arranging crest lines of continuing V shapes (or W shapes) in the horizontal direction and trough lines of continuing V shapes (or W shapes) in the horizontal direction, that bends of the V shapes (or W shapes) form curved lines, and that the main flow of a fluid flows in the fin in an perpendicular direction of the V shapes. - The aspect of the disclosure is described above with reference to the embodiment. The disclosure is, however, not limited to the above embodiment but various modifications and variations may be made to the embodiment without departing from the scope of the disclosure.
- The technique of the disclosure is preferably applicable to the manufacturing industries of the heat exchanger and so on.
Claims (6)
- A heat exchanger configured to perform heat exchange by flowing a fluid on a surface of a heat transfer member,
the heat transfer member comprising wave-like concaves/ convexes of smooth curve lines provided on the surface exposed to the fluid, wherein the wave-like concaves/ convexes are formed such that crest lines of continuing crests of wave and trough lines of continuing troughs of wave are formed in a shape of continuing V shapes in a horizontal direction, that bends of the V shapes form curve lines, and that a main flow of the fluid flows in a direction perpendicular to the V shapes. - The heat exchanger according to claim 1,
wherein the crest line and the trough line are formed by alternately arranging linear portions and arc portions in a continuous manner. - The heat exchanger according to claim 2,
wherein the arc portion has a radius that is equal to or larger than one fifth a length of the linear portion. - The heat exchanger according to any one of claims 1 to 3,
wherein the wave-like concaves/ convexes are formed by alternately arranging straight lines and arcs in a continuous manner in cross section. - The heat exchanger according to any one of claims 1 to 4,
wherein the heat transfer member is a heat exchange tube formed as a flat hollow pipe, and
the wave-like concaves/ convexes are formed on a flat surface of the heat exchange tube. - The heat exchanger according to any one of claims 1 to 4,
wherein the heat transfer member is a fin coupled with a heat exchange tube.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2015/086562 WO2017115436A1 (en) | 2015-12-28 | 2015-12-28 | Heat exchanger |
Publications (2)
Publication Number | Publication Date |
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EP3399268A1 true EP3399268A1 (en) | 2018-11-07 |
EP3399268A4 EP3399268A4 (en) | 2019-08-28 |
Family
ID=59224896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15912102.9A Withdrawn EP3399268A4 (en) | 2015-12-28 | 2015-12-28 | Heat exchanger |
Country Status (5)
Country | Link |
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US (1) | US20180372425A1 (en) |
EP (1) | EP3399268A4 (en) |
JP (1) | JPWO2017115436A1 (en) |
CN (1) | CN108700384A (en) |
WO (1) | WO2017115436A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101749059B1 (en) * | 2015-09-04 | 2017-06-20 | 주식회사 경동나비엔 | Wave plate heat exchanger |
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JPH0731029B2 (en) * | 1988-02-29 | 1995-04-10 | 株式会社日立製作所 | Heat exchanger with inclined corrugated fins |
BR9505782A (en) * | 1994-03-03 | 1996-03-05 | Gea Luftkuehler Happel Gmbh | Ribbed tube heat exchanger |
JP3451160B2 (en) * | 1996-04-17 | 2003-09-29 | 株式会社 日立インダストリイズ | Plate heat exchanger |
JP3423549B2 (en) * | 1996-11-22 | 2003-07-07 | 東洋ラジエーター株式会社 | Multi-plate heat exchanger |
US5907707A (en) * | 1997-01-14 | 1999-05-25 | International Business Machines Corporation | Object model for Java |
JPH10281677A (en) * | 1997-04-08 | 1998-10-23 | Ishikawajima Harima Heavy Ind Co Ltd | Heat exchanger |
JP2003251500A (en) * | 2002-03-01 | 2003-09-09 | Kawasaki Thermal Engineering Co Ltd | Plate progressive feeding forming device and die used therefor |
JP4815612B2 (en) * | 2005-07-29 | 2011-11-16 | 国立大学法人 東京大学 | Heat exchanger, air conditioner using the same, and air property converter |
JP4756585B2 (en) * | 2005-09-09 | 2011-08-24 | 臼井国際産業株式会社 | Heat exchanger tube for heat exchanger |
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CN101589285B (en) * | 2007-01-25 | 2011-10-26 | 国立大学法人东京大学 | Heat exchanger |
JP5082120B2 (en) * | 2007-03-23 | 2012-11-28 | 国立大学法人 東京大学 | Heat exchanger |
CN201569352U (en) * | 2009-07-30 | 2010-09-01 | 江苏工业学院 | All-welded dual waveform cross flow type plate type heat exchanger plate bundle |
JP2011091301A (en) * | 2009-10-26 | 2011-05-06 | Toyota Industries Corp | Liquid cooling type cooling device |
JP5620685B2 (en) * | 2010-02-02 | 2014-11-05 | 国立大学法人東京大学 | Heat exchanger |
JP5834324B2 (en) * | 2011-08-03 | 2015-12-16 | 国立大学法人 東京大学 | Corrugated fin heat exchanger |
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JP2013087977A (en) * | 2011-10-14 | 2013-05-13 | Panasonic Corp | Fin tube type heat exchanger |
JP5921413B2 (en) * | 2012-10-30 | 2016-05-24 | カルソニックカンセイ株式会社 | Tube for heat exchanger |
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WO2014077316A1 (en) * | 2012-11-15 | 2014-05-22 | 国立大学法人東京大学 | Heat exchanger |
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-
2015
- 2015-12-28 US US16/066,887 patent/US20180372425A1/en not_active Abandoned
- 2015-12-28 EP EP15912102.9A patent/EP3399268A4/en not_active Withdrawn
- 2015-12-28 CN CN201580085593.9A patent/CN108700384A/en active Pending
- 2015-12-28 JP JP2017558830A patent/JPWO2017115436A1/en active Pending
- 2015-12-28 WO PCT/JP2015/086562 patent/WO2017115436A1/en active Application Filing
Also Published As
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WO2017115436A1 (en) | 2017-07-06 |
CN108700384A (en) | 2018-10-23 |
EP3399268A4 (en) | 2019-08-28 |
US20180372425A1 (en) | 2018-12-27 |
JPWO2017115436A1 (en) | 2018-10-18 |
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