WO2007108386A1 - フィンチューブ型熱交換器、熱交換器用フィンおよびヒートポンプ装置 - Google Patents
フィンチューブ型熱交換器、熱交換器用フィンおよびヒートポンプ装置 Download PDFInfo
- Publication number
- WO2007108386A1 WO2007108386A1 PCT/JP2007/055085 JP2007055085W WO2007108386A1 WO 2007108386 A1 WO2007108386 A1 WO 2007108386A1 JP 2007055085 W JP2007055085 W JP 2007055085W WO 2007108386 A1 WO2007108386 A1 WO 2007108386A1
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- WIPO (PCT)
- Prior art keywords
- heat transfer
- protrusion
- heat exchanger
- fin
- transfer tube
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Classifications
-
- 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
- F28D1/047—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 bent, e.g. in a serpentine or zig-zag
- F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
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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
- F28F1/24—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
- F28F1/32—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 having portions engaging further tubular elements
-
- 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
- F28F1/32—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 having portions engaging further tubular elements
- F28F1/325—Fins with openings
Definitions
- the present invention relates to a finned tube heat exchanger, a heat exchanger fin, and a heat pump device.
- fin tube type heat exchangers have been used for air conditioners, refrigerator / refrigerators, dehumidifiers, water heaters, and the like.
- the fin tube type heat exchange is constituted by a plurality of fins arranged in parallel at predetermined intervals and a heat transfer tube passing through the fins.
- Fin tube heat exchangers are known in which fin shapes are devised for the purpose of promoting heat transfer and reducing pressure loss.
- the leeward side of the heat transfer tube is normally a dead water area having a low heat transfer coefficient.
- a finned tube heat exchanger in which protrusions are provided on the surface of the fin is known for the purpose of reducing the dead water area.
- Japanese Patent Application Laid-Open No. 7-239196 discloses a fin tube type heat exchanger using fins having a large number of minute dimples provided on the surface. Specifically, as shown in FIG. 34, it is described that air is guided to the leeward side of the heat transfer tube 101 by a large number of dimples 102 on the fin 103, and the heat transfer coefficient is improved. However, since each dimple 102 is small, the effect of inducing air to the leeward side of the heat transfer tube 101 cannot be obtained as much as expected, and an improvement in heat transfer coefficient cannot be expected so much.
- Japanese Unexamined Patent Publication No. 63-294494 discloses a fin tube type heat exchanger having a triangular pyramid-shaped protrusion on the surface of the fin.
- triangular pyramidal projections 111 are arranged on both sides of the heat transfer tube 112.
- air is guided to the leeward side of the heat transfer tube 112 by these projections 111, and since the flow A becomes a narrow flow C behind the heat transfer tube 112, the flow velocity increases. It is stated that intense turbulence occurs behind the heat transfer tube 112, resulting in extremely small dead water areas. (See JP-A 63-294494, page 4, upper right column, line 17 to lower left column, line 1).
- Japanese Patent Application Laid-Open No. 6-300474 discloses a funnel tube type heat exchanger having a quadrangular pyramidal protrusion on the surface of a fin. As shown in FIG. 36, in this heat exchange ⁇ , a cut-and-raised piece 122 is formed on the leeward side of the heat transfer tube 121, and the quadrangular pyramid-shaped protrusion 123 is located between the adjacent heat transfer tubes 121. It is arranged on the leeward side of the heat pipe 121. Japanese Patent Laid-Open No.
- 6-300474 discloses that air is guided to the cut and raised piece 122 side by the projection 123, and the heat transfer coefficient on the leeward side of the heat transfer tube 121 is improved (Japanese Patent Laid-Open No. 6-300474 (See right column, page 4, line 30 to line 36).
- the protrusion 123 is disposed on the leeward side with respect to the center line 124 between the heat transfer tubes 121. Therefore, the air flow direction is changed downstream of the center of the heat transfer tube 121.
- the protrusion 123 is relatively small, it is difficult to change the air flow suddenly. Therefore, it was difficult to sufficiently guide the air behind the heat transfer tube 121.
- Japanese Unexamined Patent Application Publication No. 2002-90085 discloses fin tube type heat exchange using a fin 105 in which a cut and raised portion 106 is formed.
- a fin 105 is generally called a slit fin.
- the slit fin 105 has a slight disadvantage in terms of pressure loss, the heat transfer performance of the heat exchange ⁇ by the effect of locally increasing the heat transfer coefficient at the leading edge of the cut and raised 106, the so-called leading edge effect. Greatly improve.
- the slit fin 105 is frosted on the cut and raised portion 106 and clogs, resulting in a significant decrease in heat exchange efficiency.
- the fin tube type heat exchange ⁇ in order to increase the heat transfer rate between the refrigerant and the fluid (for example, air) in order to increase the heat transfer rate by increasing the fluid speed, the fluid is converted into a heat exchanger. It is known that the pressure loss when passing through the air also increases, and the power required for the fan that flows the fluid becomes excessive. In other words, the heat transfer coefficient, which is an index of heat transfer performance, and the pressure loss are in a trade-off relationship. Many heat exchangers using corrugated fins in which plate-like fins are folded into waves have been proposed as fin-tube heat exchangers that attempt to achieve both heat transfer performance and pressure loss.
- FIGS. 38A and 38B show a corrugated fin described in Japanese Patent Laid-Open No. 1-90995.
- the corrugated fin 109 is a fin formed such that ridges 109a and valleys 109b appear alternately in the fluid flow direction indicated by the arrows.
- Such a corrugated fin 109 has an advantage that it has an excellent balance between heat transfer performance and pressure loss, and there is no problem of clogging due to frosting, and there is no restriction on the application target.
- the present invention has been made in view of the strong point, and an object of the present invention is to provide a finned tube heat exchanger having excellent heat transfer performance and low pressure loss. It is in. It is another object of the present invention to provide a heat pump device having the fin tube type heat exchange. It is another object of the present invention to provide a fin that can be suitably used for the fin tube type heat exchanger.
- a finned tube type heat exchanger ⁇ that exchanges heat between the first fluid and the second fluid, and in order to form a space in which the first fluid should flow, Fins,
- the first heat transfer tube and the second heat transfer tube are adjacent to each other in the row direction,
- the fin is formed between the first heat transfer tube and the second heat transfer tube, and has a protrusion that guides the first fluid to the first heat transfer tube side and the second heat transfer tube side,
- a inch-type heat exchanger in which the equivalent diameter of the protrusion viewed from the axial direction of the heat transfer tube is equal to or larger than the outer diameter of the heat transfer tube.
- the present invention provides a fin used in the fin tube type heat exchanger.
- the present invention also provides:
- An expansion mechanism for expanding the refrigerant radiated by the radiator
- a heat pump device in which at least one of an evaporator and a radiator includes the fin tube type heat exchange.
- the finned tube heat exchanger of the present invention forms a protrusion with a large surface area between the first heat transfer tube and the second heat transfer tube to increase the heat transfer area of the fin, and It aims to suppress the development of the layer and velocity boundary layer.
- the heat transfer performance of the finned tube heat exchanger is improved by expanding the heat transfer area and suppressing the development of the boundary layer.
- the equivalent diameter of the protrusion seen from the axial direction of the heat transfer tube is equal to or larger than the outer diameter of the heat transfer tube. In other words, when a projection is orthogonally projected on a plane parallel to the plurality of fins, the area of the image of the projection appearing on the plane is greater than or equal to the cross-sectional area of the heat transfer tube.
- the surface area of the fin can be sufficiently earned.
- the protrusion having a relatively large size exerts a strong action on the first fluid to increase the flow velocity in the flat region between the first heat transfer tube and the flat region between the second heat transfer tube.
- a higher flow rate is preferred because the heat transfer rate increases.
- the side surface portion facing the protrusion can sufficiently contribute to heat transfer.
- the protrusion is located behind the heat transfer tube. 1 induce fluid. This prevents a large dead water area from occurring behind the heat transfer tube.
- the heat transfer performance of the finned tube heat exchanger is improved.
- FIG. 2 is a plan view of the fin according to the first embodiment.
- FIG. 5 is a plan view of the fin of the first embodiment showing the air flow.
- FIG. 10 is a plan view of the fin according to the second embodiment.
- FIG. 11 is a perspective view of a fin according to the second embodiment.
- FIG. 12 is a plan view of the fin according to the third embodiment.
- FIG. 14 is a plan view of the fin according to the fourth embodiment.
- FIG. 20 is a plan view of the fin according to the fifth embodiment.
- FIG. 21 is a plan view of the fin according to the sixth embodiment.
- FIG. 22 is a plan view of a fin according to a modification of the sixth embodiment.
- FIG. 23A Plan view of fins of embodiment 7
- FIG. 23B Dl-Dl cross section of Fig. 23A
- FIG. 24A is a plan view of a fin according to a modification of the seventh embodiment.
- FIG. 26 is a schematic diagram showing an application example of the heat pump device of FIG.
- FIG. 28A Contour plot showing simulation results (Nussell number distribution) of the heat exchanger of Example 2
- FIG. 29B Contour plot showing simulation results (flow velocity distribution) following Fig. 29A
- FIG. 30A Contour plot showing simulation results (Nusselt number distribution) of heat exchanger of Comparative Example 1
- FIG. 30B Contour plot showing simulation results (flow velocity distribution) following Fig. 30A
- FIG. 31A Contour plot showing simulation results (Nusselt number distribution) of heat exchanger of Example 4.
- FIG. 31B Contour map showing simulation results (flow velocity distribution) following Fig. 31A
- FIG. 32A Contour plot showing simulation results (Nusselt number distribution) of the heat exchanger of Example 5
- FIG. 32B Contour plot showing simulation results (flow velocity distribution) following Fig. 32A
- FIG. 33A Contour plot showing simulation results (Nusselt number distribution) of heat exchanger of Comparative Example 2
- FIG.35 Top view of fins of conventional fin tube heat exchanger
- FIG.36 Top view of fins of conventional fin-tube heat exchanger
- FIG. 1 is an overall perspective view of the finned tube heat exchanger according to the present embodiment.
- the finned tube heat exchanger 1 includes a plurality of fins 3 arranged in parallel at predetermined intervals and a plurality of heat transfer through the fins 3 to form a space in which the first fluid is to flow. With tube 2.
- the heat exchange 1 exchanges heat between the first fluid flowing along the main surface of the fin 3 and the second fluid flowing inside the heat transfer tube 2.
- air A flows along the main surface of the fin 3, and refrigerant B flows inside the heat transfer tube 2.
- the plurality of heat transfer tubes 2 penetrating the fins 3 are connected to one so that the refrigerant B flows in order.
- the type and state of the fluid flowing inside the heat transfer tube 2 and the fluid flowing along the main surface of the fin 3 are not particularly limited. These fluids may be gas or liquid.
- the plurality of heat transfer tubes 2 do not necessarily have to be connected to one.
- the heat exchanger 1 is installed in such a posture that the flow direction of the air A (X direction) is substantially perpendicular to the stacking direction of the fins 3 (Y direction) and the row direction of the heat transfer tubes 2 (Z direction). .
- the airflow direction may be slightly inclined from the X direction as long as a sufficient amount of heat exchange can be ensured.
- the stacking direction (Y direction) which is a direction perpendicular to the main surface of the fin 3 is defined as the height direction.
- the fins 3 have a rectangular and flat plate shape and are arranged along the Y direction shown in FIG. In the present embodiment, the fins 3 are arranged at a constant interval (fin pitch).
- the fin pitch is, for example, 1. Omm to l.5 mm. However, the fin pitch need not be constant and may be different.
- the fin pitch FP is expressed by the center-to-center distance in the thickness direction of two adjacent fins 3 and 3.
- the fin 3 can be formed of, for example, a metal plate having a thickness of 0.08 to 0.2 mm that has been punched. metal The plate is, for example, an aluminum flat plate.
- a plurality of through holes 3h (FIG.
- the surface of the fin 3 is preferably subjected to a hydrophilic treatment such as boehmite treatment or application of a hydrophilic paint, or a water repellent treatment.
- FIG. 2 is a plan view of the fin used for the heat exchange in FIG.
- a cross section parallel to the main surface of the fin 3 (specifically, the main surface in a flat region where the protrusion 5 is not formed) appears.
- the heat transfer tubes 2 are arranged in two front and rear rows along the row direction parallel to the longitudinal direction of the fins 3. That is, the straight line connecting the centers of the through holes 3h in each row is parallel to the front edge 30p of the fin 3.
- the heat transfer tube 2 in the first row and the heat transfer tube 2 in the second row are shifted by 1Z2 of the tube pitch in the Z direction. That is, the heat transfer tubes 2 are arranged in a staggered pattern.
- the outer diameter D of the heat transfer tube 2 is, for example, lmn! ⁇ 20 mm, which corresponds to the opening diameter of the through hole 3 h formed in the fin 3.
- the heat transfer tube 2 is in close contact with the fin collar 3a that forms the through hole 3h, and is fitted to the fin collar 3a.
- Such a heat transfer tube 2 is a smooth tube with a smooth inner surface, or a grooved tube with a groove formed on the inner surface, made of a highly conductive metal such as copper or copper alloy.
- a regular quadrangular pyramid-shaped protrusion 5 is formed on the surface of the fin 3, a regular quadrangular pyramid-shaped protrusion 5 is formed.
- the protrusion 5 protrudes from one surface of the fin 3 and is disposed between the heat transfer tubes 2 in each row.
- the protrusion 5 is arranged at an intermediate position between the heat transfer tubes 2 adjacent in the row direction.
- the equivalent diameter d of the protrusion 5 in which the length 1 of the lower side of the protrusion 5 is equal to the outer diameter D of the heat transfer tube 2 is larger than the outer diameter D of the heat transfer tube 2.
- symbol L has shown the airflow direction length (X direction length) of the protrusion 5.
- the width of the protrusion 5 in the Z direction increases along the air A flow direction from the upstream end 8a to the midway portion 8b and decreases from the midway portion 8b to the downstream end 8c.
- Projection 5 is located on the upper left side of Fig. 2.
- the first inclined surface 6a is located, the second inclined surface 6b is located on the lower left side, the third inclined surface 6c is located on the lower right side, and the fourth inclined surface 6d is located on the upper right side.
- the first inclined surface 6a and the second inclined surface 6b are partitioned by a ridge line 7a extending in the X direction.
- the first inclined surface 6a is inclined toward one of the adjacent heat transfer tubes 2A (hereinafter referred to as the first heat transfer tube), and the second inclined surface 6b is the other heat transfer tube 2B (hereinafter referred to as the second heat transfer tube). ) Is inclined to the side.
- the first inclined surface 6a and the fourth inclined surface 6d are partitioned by a ridge line 7b extending in the Z direction.
- the second inclined surface 6b and the third inclined surface 6c are also partitioned by the ridgeline 7b.
- the protrusion 5 is disposed on the relatively upstream side. Specifically, the upstream end 8 a of the protrusion 5 is located upstream of the center C of each heat transfer tube 2. The midway portion 8 b of the protrusion 5 is located upstream of the downstream end 2 e of the heat transfer tube 2. In other words, the upstream end 8a of the protrusion 5 is located upstream of the line 9 connecting the centers C of the heat transfer tubes 2, and the middle portion 8b of the protrusion 5 is connected to the downstream ends 2e of the heat transfer tubes 2. It is located upstream from the connected line 10. The downstream end 8c of the protrusion 5 is located downstream of the downstream end 2e of the heat transfer tube 2.
- the height H of the protrusion 5 is larger than the fin pitch FP.
- the height H of the protrusion 5 may be equal to the fin pitch FP or smaller than the fin pitch FP.
- the height H of the protrusion 5 may be, for example, 0.2 to 2 times the fin pitch FP or 0.5 to 2 times the fin pitch FP.
- the height H of the protrusion 5 is smaller than the fin pitch FP, when viewed from the upstream side to the downstream side, it extends in the X direction between the adjacent fins 3. A straight gap G will be formed. Therefore, from the viewpoint of reducing the pressure loss, the height H of the protrusion 5 is preferably smaller than the fin pitch FP. Considering the balance between improving heat transfer characteristics and reducing pressure loss, the height H of the protrusion 5 is 0.2 times or more (preferably 0.25 times or more) of the fin pitch FP and less than 1 time. Is preferred.
- the airflow A 1 that has flowed forward of the fin 3 collides with the protrusion 5.
- a part of the airflow A2 after the collision is transferred to the first heat transfer tube 2A by the first inclined surface 6a.
- the other airflow A2 ′ is guided to the second heat transfer tube 2B side by the second inclined surface 6b.
- the airflow A2 guided to the first inclined surface 6a wraps around the first heat transfer tube 2A.
- the air flow A2 ′ guided to the second inclined surface 6b goes around the second heat transfer tube 2B.
- the decrease in the heat transfer coefficient is suppressed, and the area of the dead water area is reduced.
- Table 1 shows a fin-tube heat exchanger having conventional corrugated fins (fins in which the fins are bent in a wave shape, for example, see Fig. 1 and Fig. 2 of JP-A-1-90995), The simulation results are shown in comparison with the finned tube heat exchanger of this embodiment (see Fig. 7 for specific shape).
- the fin thickness was 0.1 mm
- the fin pitch was 1.5 mm
- the heat transfer tube outer diameter was 7. Omm
- the front wind speed Vair was lmZs.
- the “conical fin” in Table 1 represents the fin tube type heat exchange of Embodiment 2 described later.
- ⁇ ⁇ ⁇ ⁇ becomes larger as the airflow direction length L of the protrusion 5 becomes longer, and the height ⁇ of the protrusion 5 becomes higher. It gets smaller. That is, ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ increases as the parameter LZH increases.
- Figure 8 shows a graph with the parameter LZH on the horizontal axis and the parameter Z Z P (ratio to the conventional fin) on the vertical axis. It can be seen that if LZH is greater than 5.5, the value of ⁇ ⁇ ⁇ ⁇ is higher than the heat exchange of the conventional Kolge-tophine equation. Therefore, L / H is preferably greater than 5.5.
- the fin 3 has the quadrangular pyramid-shaped protrusion 5 between the heat transfer tubes 2A and 2B, and the protrusion 5 is formed so as to separate air into one heat transfer tube 2A side and the other heat transfer tube 2B side. That is, the protrusion 5 is formed with a first inclined surface 6a that guides air to the one heat transfer tube 2A side and a second inclined surface 6b that guides air to the other heat transfer tube 2B side.
- the upstream end 8a of the protrusion 5 is located upstream of the center C of the heat transfer tubes 2A and 2B.
- the midway portion 8b which is the widest portion of the protrusion 5, is located upstream of the downstream ends 2e of the heat transfer tubes 2A and 2B. This also makes it easier for the air to circulate behind the heat transfer tubes 2A and 2B, thereby reducing the dead water area.
- the width of the protrusion 5 increases from the upstream end 8a to the midway portion 8b, and from the midway portion 8b to the downstream end. It has decreased until 8c. Therefore, after air is guided to the heat transfer tubes 2A and 2B at the part from the upstream end 8a to the middle part 8b (first inclined surface 6a and second inclined surface 6b), do not narrow the air flow path. It has become. Therefore, according to the protrusion 5 of this embodiment, it is possible to prevent the pressure loss from becoming too large.
- the protrusion 5 is disposed on the relatively upstream side. Therefore, as shown in Fig. 9, the temperature boundary layer BL that develops from the leading edge of the fin 3 collides with the protrusion 5 before it fully develops (before the temperature boundary layer BL becomes thick). . As a result, the temperature boundary layer in the protrusion 5 becomes thin, and the heat transfer coefficient of the protrusion 5 increases. That is, according to the present heat exchanger 1, since the protrusion 5 is disposed on the upstream side, the heat transfer coefficient of the protrusion 5 can be improved, and in this respect also, the heat transfer performance can be improved. Can do.
- the equivalent diameter d of the protrusion 5 is equal to or larger than the outer diameter D of the heat transfer tube 2, and the protrusion 5 is formed to be relatively large. Therefore, the flow direction can be changed on a relatively large scale. Therefore, even when the air flow rate is relatively small (for example, the front wind speed is less than 2 mZs) or particularly small! (For example, the front wind speed is less than lmZs), the air is well placed behind the heat transfer tube 2. Can be guided. According to the present heat exchange 1, good heat transfer characteristics can be exhibited even for a laminar airflow. In addition, since the protrusion 5 is formed to be relatively large in this way, air can be greatly accelerated locally between the protrusion 5 and the heat transfer tube 2 to improve the heat transfer coefficient. it can.
- the occupation area of the projection 5 is, for example, more than the occupation area (30%) in the above simulation model and less than the maximum value (for example, 75%) at which the projection 5 can be disposed between the heat transfer tubes 3. It may be. More desirably, as shown in Table 1, if the occupied area is 43% or more and 73% or less, 0: 7? The value of is more than 1 and is appropriate.
- the protrusion 5 is formed in a quadrangular pyramid shape, the air flow direction is changed relatively abruptly on the first inclined surface 6a and the second inclined surface 6b. You can. Therefore, the air can be efficiently guided to the rear of the heat transfer tube 2.
- the portion of the protrusion 5 is the portion of the protrusion 5.
- the surface area of the fin 3 is increasing. Therefore, the amount of heat exchange can be increased by expanding the heat transfer area.
- the amount of increase in the heat transfer area is not particularly limited, for example, 3 to 5%.
- the heat exchanger 1 When the heat exchanger 1 is used as a cooler for cooling air (for example, an evaporator of a refrigeration cycle apparatus), condensation may occur on the surface of the fin 3. In addition, when the heat exchanger 1 is installed in an outdoor unit or the like in a cold region, frost formation may occur on the surface of the fin 3. However, according to this heat exchange ⁇ , the surface of the fin 3 other than the protrusion 5 is flat. For this reason, compared to so-called slit fins, condensed water or water droplets after defrosting are less likely to stay on the surface of the fins 3 and easily flow down. Therefore, this heat exchanger 1 exhibits an excellent effect as a cooler.
- the protrusion 5 has a force that protrudes from one surface force of the fin 3. Some protrusions 5 protrude from one surface force of the fin 3, and the other protrusion 5 protrudes from the other surface of the fin 3. It is also possible to make the surface force of the surface protrude. For example, a plurality of protrusions 5 arranged in the row direction may be alternately projected on the front side and the back side of the fin 3.
- the length of the protrusion 5 in the airflow direction is not particularly limited.
- the length of the protrusion 5 may be set to 4.5 mm or more and less than 36 mm.
- the shape of the protrusion 5 is not limited to a quadrangular pyramid shape. If the significant effects shown in this specification such as the effect of guiding air A to the first heat transfer tube 2A and the second heat transfer tube 2B and the effect of preventing the formation of dead water areas can be obtained, the shape of the projection 5 is Other pyramid shapes such as a triangular pyramid shape may be used.
- a fin 43 as shown in FIG. 13 can also be proposed as a modification of the fin of the first embodiment.
- the outer shape 45s observed when the fin 43 is viewed in plan shows a rhombus.
- the protrusion 45 is preferably a quadrangular pyramid formed of four inclined surfaces.
- the direction of the protrusion 45 is determined such that, of the two diagonal lines of the diamond-shaped outer shape 45s, the long diagonal line is parallel to the X direction and the short diagonal force direction is parallel.
- Other configurations of the protrusion 45 are the same as those of the protrusion 5 of the first embodiment.
- the fin 13 of the present embodiment has a protrusion 15 formed in a conical shape.
- the protrusion 15 has no clear ridgeline.
- a first inclined surface 6a for guiding air to the first heat transfer tube 2A side and a second inclined surface 6b for guiding air to the second heat transfer tube 2B side are formed.
- the width of the protrusion 15 increases from the upstream end 8a to the midway portion 8b, and decreases from the midway portion 8b to the downstream end 8c.
- the upstream end 8a of the protrusion 15 is located upstream of the center C of the heat transfer tubes 2A and 2B.
- the midway portion 8b of the protrusion 15 is located upstream of the downstream ends 2e of the heat transfer tubes 2A and 2B.
- the diameter d of the protrusion 15 is not less than the diameter D of the heat transfer tube 2.
- the height of the protrusion 15 may be larger or smaller than the fin pitch. Further, the height of the protrusion 15 may be equal to the fin pitch.
- the area of the dead water area behind the heat transfer tube 2 is reduced. Therefore, the heat transfer characteristics can be improved.
- the first inclined surface 6a and the second inclined surface 6b are curved surfaces, and the air is relatively directed by force toward the first heat transfer tube 2A side and the second heat transfer tube 2B side, respectively. Can be induced gently.
- the protrusion 25 is formed in an elliptical cone shape.
- the ellipticity ratio of major axis to minor axis
- the ellipticity of the protrusion 25 is not particularly limited.
- the ellipticity may be greater than 1 and less than or equal to 2 and may be greater than or equal to 0.5 and less than 1.
- Projection 25 is elongated in the X direction! ⁇ It may be elliptical cone-shaped, elongated in the Z direction and elliptical cone-shaped! / ,.
- the width of the protrusion 25 increases from the upstream end 8a to the midway part 8b and decreases from the midway part 8b to the downstream end 8c.
- the upstream end 8a of the protrusion 25 is located upstream of the center C of each heat transfer tube 2A, 2B.
- the midway portion 8b of the protrusion 25 is located upstream of the downstream ends 2e of the heat transfer tubes 2A and 2B.
- the equivalent diameter d of the protrusion 25 is not less than the diameter D of the heat transfer tube 2.
- the height of the protrusion 25 may be larger or smaller than the fin pitch, and may be equal to the fin pitch.
- the area of the dead water area behind the heat transfer tube 2 is reduced, and the heat transfer characteristics can be improved.
- the first inclined surface 6a and the second inclined surface 6b are curved surfaces, and direct air relatively gently by directing them toward the first heat transfer tube 2A side and the second heat transfer tube 2B side, respectively. can do.
- the degree of induction of air to the first heat transfer tube 2A and the second heat transfer tube 2B can be appropriately set by appropriately changing the ellipticity of the protrusion 25. Therefore, the heat transfer characteristics can be further optimized or optimized by appropriately setting the ellipticity of the protrusion 25 according to the use conditions of the heat exchanger 1.
- FIG. 14 is a plan view of a fin according to the fourth embodiment.
- a protrusion 35 having the shape of an elliptical hill is formed on the surface of the fin 30 .
- the protrusions 35 all protrude in the same direction from one surface of the fin 30 and are located between two adjacent heat transfer tubes in the same row, the first heat transfer tube 2A and the second heat transfer tube 2B. positioned. That is, the heat transfer tubes 2 and the protrusions 35 appear alternately in the row direction.
- the projection 35 is orthogonally projected onto a virtual plane parallel to the fin 30, the image appearing on the virtual plane is elliptical.
- the area of the image of the protrusion 35 appearing on the virtual plane is larger than the cross-sectional area of the heat transfer tube 2 when cut in the radial direction perpendicular to the length direction.
- FIG. 14 which is a plan view when the fin 30 is viewed from the height direction (Y direction) perpendicular to the main surface.
- the major axis d of the elliptical outer shape 5s is larger than the outer diameter D of the heat transfer tube 2
- the minor axis d is d ⁇ d ⁇ 2d with respect to the major axis d.
- the size of the protrusion 35 can be adjusted to be within the range. Note that the cross-sectional area of the heat transfer tube 2 coincides with the opening area of the through-hole 3h formed in the fin 30 in order to arrange the heat transfer tube 2.
- only one protrusion 35 is formed between the first heat transfer tube 2A and the second heat transfer tube 2B. That is, the protrusions 35 and the through holes 3h are alternately formed along the row direction.
- the protrusions 35 are arranged in a zigzag pattern that sews between the through holes 3h.
- Japanese Patent Application Laid-Open No. 7-239196 when a large number of small protrusions are formed between two adjacent heat transfer tubes, the height of the protrusions is a problem in processing. It is difficult to earn. And such a small protrusion is weak in inducing air A.
- the height H can be sufficiently earned, so that the action of guiding the air A toward the heat transfer tube is strong.
- the heat transfer tubes 2 are arranged in a staggered manner in two rows before and after the front row near the front edge 30p of the fin 30 and the rear row parallel to the front row.
- Another protrusion 35 having the same shape and the same size as the protrusion 35 formed between two adjacent heat transfer tubes 2 and 2 arranged in the front row is adjacent to the adjacent 2 arranged in the rear row. It is also formed between the heat transfer tubes 2 and 2 of the book. Thereby, the improvement effect of the heat transfer rate can be expected in the rear row as well as the front row.
- the position and orientation of the protrusion 35 are preferably determined as follows. As shown in FIG. 14, the upstream end 5f of the protrusion 35 in the direction (X direction) orthogonal to the main surface and the row direction of the fin 30 is the upstream end 2 of the heat transfer tubes 2A and 2B. Located near 30p (outer edge). In this way, the air A approaching the front edge 30p of the fin 30 can be quickly guided toward the heat transfer tube 2, which is advantageous in improving the heat transfer performance. On the other hand, the downstream end 5e of the projection 35 is farther from the front edge 30p of the fin 30 than the centers CI and C2 of the heat transfer tubes 2A and 2B. In other words, it is located downstream of the flow direction of air A.
- the air A flowing on the main surface of the fin 30 can be efficiently guided behind the heat transfer tubes 2A and 2B, and the formation of a dead water area that does not contribute to heat transfer can be suppressed.
- the downstream end 5e of the projection 35 is located on the downstream side in the flow direction of the air A with respect to the downstream end 2e of the heat transfer tubes 2A and 2B.
- the projection 35 having an elliptical outer shape 5s is oriented so that the minor axis of the ellipse is parallel to the row direction (Z direction) in which the first heat transfer tube 2A and the second heat transfer tube 2B are arranged.
- Z direction the row direction
- the major axis of the ellipse are parallel.
- the air A can be guided more smoothly to the left and right of the protrusion 35, and the degree of increase in pressure loss due to the formation of the protrusion 35 can be reduced.
- the major axis of the ellipse can be oriented parallel to the column direction.
- the protrusion 35 is formed at a position equidistant from the center C1 of the first heat transfer tube 2A and the center C2 of the second heat transfer tube 2B. That is, the protrusion 35 is formed on a virtual plane MD that bisects a line segment C 1 C2 connecting the center C1 of the first heat transfer tube 2A and the center C2 of the second heat transfer tube 2B with the shortest distance.
- the positions relative to the first heat transfer tube 2A and the second heat transfer tube 2B are determined so that the major axis of the elliptical image in the orthogonal projection plane is included.
- both the first heat transfer tube 2A and the second heat transfer tube 2B can equally contribute to heat transfer. In such a case, the heat transfer performance of the funnel-type heat exchange can be maximized.
- the height H of the protrusion 35 satisfies (FP / 4) ⁇ H ⁇ FP when the fin pitch, which is the center-to-center distance in the thickness direction of the fin 30, is FP. It has been adjusted to The fins 30 are arranged so that the positions where the protrusions 35 are formed coincide with each other in the height direction. If the height H of the protrusion 35 is smaller than the fin pitch FP, when viewed from the upstream side to the downstream side, the straight line between the adjacent one of the fins 30 and the other fin 30 is straight in the X direction. An extending gap G is formed. Therefore, from the viewpoint of reducing the pressure loss, the height H of the protrusion 35 is preferably smaller than the fin pitch FP.
- the projection 35 When the projection 35 is viewed in plan, it coincides with the center of the ellipse. With such a shape, the air A flows smoothly toward the apex TP, so the increase in pressure loss can be suppressed.
- the cross-sectional view of the fin 30 shown in FIG. 15 represents an XY cross-section that is perpendicular to the main surface in the flat region of the fin 30 and includes the major axis of the projection 35.
- the XY cross section is also a cross section parallel to the air A flow direction and perpendicular to the main surface of the fin 30.
- the shape of the protrusion 35 can be adjusted so that the surface 5p (outer peripheral surface) draws a curve in this XY cross section.
- the curve is, for example, a sine curve.
- the shape of the part 35 may be adjusted. That is, the surface 5 ⁇ of the protrusion 35 is continuously connected to the main surface of the flat region of the fin 30 at a position of 180 ° corresponding to the upstream end 5f. With such a surface shape, the increase in pressure loss can be suppressed and stopped while increasing the height H of the protrusion 35 where the flow velocity of the air A flowing so as to ride on the protrusion 35 is difficult to decrease.
- Another curve that can continuously bend is a clothoid curve, and this clothoid curve can be adopted as the surface shape of the protrusion 35. That is, the shape of the protrusion 35 can be adjusted so that the surface 5p draws a clothoid curve in the XY cross section.
- Figure 17A shows the clothoid curve.
- the degree of curve bending is represented by a curvature circle.
- a curve that continuously changes from small to large or large to small without the jump of the curve is optimal for the highway alignment.
- the best example of such a curve is "clothoid".
- the radius r of the clothoid's curvature circle is inversely proportional to the curve path (distance s of origin force in Fig. 17A). That is,
- the curve defined by the polar equation (1) is a clothoid.
- the climbing section from the upstream end 5f to the vertex TP is divided into multiple sections, and these divided sections
- the shape of the protrusions 35 can be adjusted so that each of them is drawn with a clothoid curve. Adjustments should be made so that the radius of the curvature circle changes continuously at the boundaries between sections.
- Top point TP force The descending section leading to the downstream end 5e may be symmetric with the climbing section.
- the shape of the protrusion 35 may be adjusted so that a part of the surface 5p draws a clothoid curve and the remaining part draws another curve such as an arc.
- the clothoid curve introduction section is set to the 5th station, that is, to the position corresponding to half of the position force height H corresponding to the upstream end 5f. From the 5th station to the 10th station, that is, the position force corresponding to half of the height H, the upper half including the vertex TP should draw an arc.
- the section of the clothoid curve shown in FIG. 17B may be another relaxation curve (a curve in which the radius of curvature circle continuously changes), for example, the sine curve or the cubic parabola described above.
- the section may be represented by an arc.
- the shape of the protrusion 35 is adjusted so that the cross section perpendicular to the main surface of the fin 30 and including the minor axis, that is, the YZ cross section, the surface 5p draws a relaxation curve such as a sine curve or a clothoid curve. This is desirable. More preferably, an arbitrary one that is perpendicular to the main surface of the fin 30 and includes the apex TP
- the shape of the protrusion 35 is adjusted so that the surface 5p draws a relaxation curve in the cross section. This By doing so, the effect of suppressing the decrease in the flow velocity can be maximized, and the protrusion
- Air A coming to 35 can be guided more smoothly toward the heat transfer tube 2.
- the shape of the protrusion 35 is a cross section that is perpendicular to the main surface of the fin 30 and includes an elliptical short axis or long axis, and includes a curve including an inflection point between the upstream end 5f and the vertex TP. As the surface 5p draws
- the fin 30 can be easily manufactured. That is, in any cross section that is perpendicular to the main surface of the fin 30 and includes the apex TP,
- the shape of the protrusion 35 can be adjusted so that the surface 5p draws a curve that does not include the inflection point.
- the air A that has reached the leading edge 30p of the fin 30 is a directional force that is parallel to the main surface of the fin 30 and perpendicular to the longitudinal direction on the main surface of the fin 30, that is, fin tube type heat. Guided to exchange. Since the heat transfer tubes 2 are arranged so as to penetrate the fins 30, the air A flows around the heat transfer tubes 2. Further, since the fin 30 is formed with the protrusion 35, the air A tends to flow avoiding the protrusion 35. In other words, the protrusion 35 guides the air A toward the heat transfer tube 2. As a result, an air flow AF with an increased flow velocity is created between the projection 35 and the heat transfer tube 2. As the flow rate increases, the heat transfer rate increases.
- the heat transfer coefficient in the vicinity of the side surface of the heat transfer tube 2 indicated by the broken line in FIG. 18 is increased, the heat of the refrigerant flowing in the heat transfer tube 2 can be efficiently transferred to the air A.
- the leading edge effect due to the impact of air A on the upstream end 5f of the protrusion 35, the effect of suppressing the development of the boundary layer at the protrusion 35, and the air flowing toward the rear of the heat transfer tube 2 The heat transfer performance of the finned-tube heat exchanger 1 is enhanced based on the effect of reducing the dead water area DS by.
- the protrusion 35 is adjusted to a shape that suppresses an increase in pressure loss as much as possible. According to the results of the computer simulation conducted by the present inventors, when the pressure loss of the heat exchanger using the conventional corrugated fin is 1, the pressure loss of the heat exchanger of the present embodiment is 0.91. About 10% / J.
- each protrusion 205a, 205b having an elliptical hill shape is formed between B and B!
- the equivalent diameter of each protrusion 205a, 205b is smaller than the outer diameter D of the heat transfer tube 2.
- One protrusion 205a induces air A toward the first heat transfer tube 2A, and creates an air flow AF with an increased flow velocity between the protrusion 205a and the first heat transfer tube 2A.
- the other protrusion 205b faces the second heat transfer tube 2B.
- Air A is induced to create an air flow AF with an increased flow velocity between the projection 205b and the second heat transfer tube 2B. Furthermore, the flow velocity is also between one protrusion 205a and the other protrusion 205b.
- the air flow AF between the protrusions 205a and 205b is caused by the heat transfer tubes 2A and 2B.
- fins 31 shown in the plan view of FIG. 20 can be suitably employed.
- the arrangement and dimensions of the heat transfer tube 2 are the same as those in the fourth embodiment. The difference is that a protrusion 51 having a conical shape is used instead of the protrusion 35 having an elliptical cone shape.
- the protrusion 51 formed on the surface of the fin 31 has a circular outer shape 51 s in plan view. That is, when the projection 51 is orthogonally projected onto a virtual plane parallel to the fins 31, the image that appears on the virtual plane is circular.
- the diameter d of the circle drawn by the outer shape 51s of the protrusion 51 is
- the protrusion 51 having the shape of a circular hill does not have a problem of orientation as the protrusion 35 having the shape of an elliptic hill (Fig. 14), but the position can be determined in the same manner as in the case of the elliptic hill. it can. That is, the protrusion 51 can be formed at a position equidistant from the center C1 of the first heat transfer tube 2A and the center C2 of the second heat transfer tube 2B. Specifically, the line segment C 1 C2 that divides the center C1 of the first heat transfer tube 2A and the center C2 of the second heat transfer tube 2B at the shortest distance into the virtual plane MD that bisects the vertex TP
- the positions of the protrusions 51 relative to the first heat transfer tube 2A and the second heat transfer tube 2B are determined so that 2 overlap. Can. Furthermore, it is preferable that the upstream end 51f of the protrusion 51 is positioned upstream of the upstream end 2 beam of the heat transfer tube 2 and the downstream end 51e is positioned downstream of the downstream end 2e of the heat transfer tube 2. These points are the same as in the case of the protrusion 35 described in the fourth embodiment.
- the height and surface shape of the protrusion 51 are the same as in the case of the protrusion 35 described in the fourth embodiment.
- the surface 51p in the XY section has a sinusoidal curve (FIGS. 16A and 16B) and The shape of the protrusion 51 can be adjusted to draw a relaxation curve such as a clothoid curve (FIG. 17B). Further, the surface 51p draws a curve including the inflection point between the upstream end 51f and the vertex TP.
- the shape of the part 51 can be adjusted.
- the curved force drawn by the surface 51p does not include the inflection point between the upstream end 51f and the apex TP!
- Embodiments 4 and 5 as in Embodiment 1, the imaginary line extending in the X direction from the upstream ends 5f and 5 If of the protrusions 35 and 51 and the apexes TP of the protrusions 35 and 51, Z direction through TP
- the first inclined surface that guides air to the first heat transfer tube 2A side and the second inclined surface that guides air to the second heat transfer tube 2B side are formed between the two imaginary lines. Has been.
- the widths of the protrusions 35 and 51 increase from the upstream ends 5f and 51f to the intermediate portions 5b and 51b, and from the intermediate portions 5b and 51b to the downstream ends 5e and 51e. Is decreasing.
- the upstream ends 5f and 51f of the protrusions 35 and 51 are located upstream of the centers CI and C2 of the heat transfer tubes 2A and 2B.
- the middle portions 5b and 51b of the protrusions 35 and 51 are located upstream of the downstream ends 2e of the heat transfer tubes 2a and 2b.
- the equivalent diameter d of the protrusions 35 and 51 is equal to or larger than the diameter D of the heat transfer tube 2.
- the height of the protrusions 35 and 51 may be equal to the fin pitch, which may be larger or smaller than the fin pitch. With this configuration, the same effect as in the first embodiment can be obtained.
- the finned tube heat exchanger 1 can preferably employ the fins 32 shown in the plan view of FIG.
- the arrangement and dimensions of the heat transfer tube 2 are the same as those in the fourth embodiment. The difference is that between the protrusion 35 formed in the front row and the other protrusion 35 formed in the rear row, the second protrusion 53 having a smaller surface area than the protrusions 35 and 35 is provided. It is a point that is formed. Strictly speaking, in FIG. 21, which is a plan view when the fin 32 is viewed from the height direction (Y direction) perpendicular to the main surface, the diameter d of the second protrusion 53 is the outside of the heat transfer tube 2. Smaller than diameter D. Also
- the second protrusion 53 protrudes in the same direction as the protrusions 35 and 35 in the front row and the rear row.
- a slight space is generated between the protrusion 35 in the front row and the protrusion 35 in the rear row. If the second protrusion 53 is formed in this slight space, the heat transfer area is expanded.
- the region where the second protrusion 53 is formed is a passage for air A whose flow velocity is increased by the action of the protrusions 35 in the front row, so the flow velocity is increased in the second protrusion 53. It is possible to further improve the heat transfer performance by positively applying the generated air A.
- Such a second protrusion 53 may have a conical shape as in the present embodiment, or may have a elliptical hill shape.
- conical protrusions 51, 51 are formed in the front row and the rear row, and the front row protrusion 51 and the rear row protrusion 51 are formed.
- the fin 33 having the second protrusion 53 having a smaller surface area than the protrusions 51 and 51 is also suitable for the same reason as described above.
- the protrusions 35, 51, 53 described in the fourth to sixth embodiments are all formed so as to protrude in the same direction. However, as mentioned in Embodiment 1, this is not essential. In other words, as shown in FIGS. 23A and 23B, the protrusion 35 protrudes toward the first main surface 34j (the front side of the fin 34) and protrudes toward the second main surface 34k (the back side of the fin 34).
- the fin 34 formed by mixing with the projecting portion 35 ' can be suitably used as the fin of the fin tube type heat exchanger 1.
- the metal plate to be the fin 34 is pressed from both sides. By pressing from both sides Therefore, the distortion can be balanced between the front and back surfaces, and the occurrence of warpage can be prevented.
- the protrusions 35 and 35 ' can have the same dimensions and positions as described in the fourth embodiment, except that the protruding directions are different. Further, it is preferable that the protrusions 35 and 35 ′ are formed in the same number and alternately in the column direction. In such a case, a high warp prevention effect can be obtained. Of course, such a configuration should be combined with all other embodiments.
- the fin 36 shown in FIGS. 24A and 24B can also be suitably used as a fin of the fin tube type heat exchanger 1.
- the fin 36 is an application of the fin 32 described in FIG. 21, and the protrusion direction of the second protrusion 53 ′ formed between the protrusion 35 in the front row and the protrusion 35 in the rear row is The projecting direction of the large front and rear projections 35 and 35 is opposite.
- the large protrusions 35, 35 are all formed so as to protrude toward the first main surface 36j of the fin 36, and the small second protrusion 53 is formed so as to protrude toward the second main surface 36k of the fin 36. Being! Even in this way, the warping prevention effect can be sufficiently obtained.
- Embodiments 1 to 7 can be implemented in any combination without departing from the scope of the present invention.
- the second protrusion 53 described in FIG. 21 and the like can be applied to all other embodiments.
- the fin-tube heat exchanger 1 described above can be applied to a heat pump device that heats or cools an object such as air or water.
- the heat pump device 70 includes a compressor 71 that compresses the refrigerant, a radiator 72 that radiates the refrigerant compressed by the compressor 71, and an expansion valve 73 that expands the refrigerant radiated by the radiator 72. And an evaporator 74 for evaporating the refrigerant expanded by the expansion valve 73.
- the compressor 71, the radiator 72, the expansion valve 73, and the evaporator 74 are connected by a pipe 75 to form a refrigerant circuit.
- a positive displacement expander may be employed.
- the radiator 72 and the evaporator 74 can be configured to include the fin tube type heat exchanger 1 of the present invention.
- the heat pump device 70 can be applied to an air conditioner 80 and a water heater 90 as shown in FIG.
- the heat pump type air conditioner 80 includes an indoor unit 81 to be placed indoors and an outdoor unit 82 to be placed outdoors that forms a refrigerant circuit together with the indoor unit 81.
- This air conditioner 80 is an air conditioning unit
- the refrigerant circulation direction is reversed between cooling and heating. Indoor unit during cooling
- the heat exchanger composing 81 is an evaporator
- the heat exchanger composing the outdoor unit 82 is a radiator.
- the heat exchange that forms the indoor unit 81 serves as a radiator
- the heat exchanger that forms the outdoor unit 82 serves as an evaporator.
- the fin tube type heat exchanger 1 of the present invention can be suitably employed for the heat exchange for the outdoor unit 82.
- the heat exchanger that constitutes the outdoor unit 82 works as the evaporator 74 of the heat pump device 70, so it is easy to form frost, especially in winter!
- the cut-and-raised portions as described with reference to FIG. 37 are not formed. Therefore, the fins are clogged due to frost formation, and heat exchange is performed. If the efficiency drops significantly, there will be no problems.
- a heat pump type hot water heater 90 includes a heat pump unit 91 and a hot water storage tank unit 92.
- the heat pump unit 91 includes a heat exchanger 73 that plays a role of warming water and a heat exchanger 74 that collects heat from the outdoors.
- the finned tube heat exchanger of the present invention can be suitably employed.
- Heat transfer tube outer diameter 5. Omm
- Protrusion shape Circle with cos curve (one 90 ° ⁇ X ⁇ 90 °)
- FIGS. 27 shows the results of Example 1
- FIG. 28 shows the results of Example 2
- FIG. 29 shows the results of Example 3
- FIG. 30 shows the results of Comparative Example 1.
- Fig. 27 to Fig. 30, Fig. A shows the Nusselt number distribution
- Fig. B shows the flow velocity distribution.
- White arrows in the figure indicate the direction of air flow.
- the region with a large Nusselt number is limited to the front edge of the fin and the vicinity of the heat transfer tube.
- the region with a large Nusselt number is formed on the surface of the projection where only the front edge of the fin and the vicinity of the heat transfer tube are connected so that the forces of Fig. 27A to Fig. 29A are also divided. Is also expanding.
- the flux distribution in each figure B is a value at an intermediate position between the fins.
- the corrugated fins and the fins of the present invention have the same fin pitch, there is no significant difference in the flow velocity distribution.
- the factors that improve heat transfer performance are mainly that the boundary layer on the fin surface is thin and the flow velocity around the heat transfer tube is large. These two factors appear in the Nusselt number distribution.
- the boundary layer is thinned on the surface of the protrusion, and further, the flow velocity between the protrusion and the heat transfer tube is increased, thereby corrugated fins. It is possible to achieve a heat transfer coefficient superior to that of heat exchange using As shown in Table 2, the heat exchangers of Examples 1 to 3 have a lower pressure loss than the conventional heat exchanger using corrugated fins.
- Fin size 27. Omm (air flow direction)
- X 10.5mm row direction
- Fin thickness 0. lmm
- Heat transfer tube outer diameter 7. Omm
- Protrusion shape Elliptical hill with cos curve (one 90 ° ⁇ X ⁇ 90 °)
- the shape of the first protrusion a circle with a cos curve (one 90 ° ⁇ X ⁇ 90 °)
- the shape of the second protrusion a circle with a cos curve (one 90 ° ⁇ X ⁇ 90 °)
- Diameter of second protrusion 5.7mm
- Second protrusion height 0.765mm
- the heat exchange in Example 4 using fins whose protrusions are elliptic hills shows the same tendency as the heat exchange in Examples 1 to 3.
- the heat exchanger of Example 4 is substantially the same as the heat exchanger of Comparative Example 2 in terms of heat transfer coefficient, and is superior to the heat exchanger of Comparative Example 2 in terms of pressure loss.
- the flow velocity is large between the front row projection (first projection) and the heat transfer tube, as shown in Fig. 32A and Fig. 32B.
- the Nusselt number increases on the surface of the second protrusion. That is, the effect of thinning the boundary layer on the surface of the second protrusion is obtained.
- the heat exchange of Example 5 was substantially the same as the heat exchanger of Comparative Example 2 in terms of heat transfer coefficient, and was superior to the heat exchanger of Comparative Example 2 in terms of pressure loss.
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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)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008506262A JPWO2007108386A1 (ja) | 2006-03-23 | 2007-03-14 | フィンチューブ型熱交換器、熱交換器用フィンおよびヒートポンプ装置 |
| EP07738555A EP2006629A2 (en) | 2006-03-23 | 2007-03-14 | Fin-tube heat exchanger, fin for heat exchanger, and heat pump device |
| US12/294,015 US20090199585A1 (en) | 2006-03-23 | 2007-03-14 | Fin-tube heat exchanger, fin for heat exchanger, and heat pump apparatus |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-080270 | 2006-03-23 | ||
| JP2006080270 | 2006-03-23 | ||
| JP2006-116469 | 2006-04-20 | ||
| JP2006116469 | 2006-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007108386A1 true WO2007108386A1 (ja) | 2007-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/055085 Ceased WO2007108386A1 (ja) | 2006-03-23 | 2007-03-14 | フィンチューブ型熱交換器、熱交換器用フィンおよびヒートポンプ装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20090199585A1 (ja) |
| EP (1) | EP2006629A2 (ja) |
| JP (1) | JPWO2007108386A1 (ja) |
| WO (1) | WO2007108386A1 (ja) |
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| WO2009084347A1 (ja) * | 2007-12-28 | 2009-07-09 | Mitsubishi Heavy Industries, Ltd. | フィンアンドチューブ型熱交換器 |
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| CN102326048A (zh) * | 2009-02-23 | 2012-01-18 | 特灵国际有限公司 | 热交换器 |
| WO2011096124A1 (ja) * | 2010-02-08 | 2011-08-11 | 住友軽金属工業株式会社 | フィン・アンド・チューブ式熱交換器 |
| WO2012014934A1 (ja) * | 2010-07-27 | 2012-02-02 | 住友軽金属工業株式会社 | 空気調和機用サーペンタイン熱交換器 |
| JPWO2012014934A1 (ja) * | 2010-07-27 | 2013-09-12 | 住友軽金属工業株式会社 | 空気調和機用サーペンタイン熱交換器 |
| CN103608639A (zh) * | 2011-06-29 | 2014-02-26 | 松下电器产业株式会社 | 翅片管型热交换器 |
| JPWO2013001744A1 (ja) * | 2011-06-29 | 2015-02-23 | パナソニック株式会社 | フィンチューブ型熱交換器 |
| WO2013001744A1 (ja) * | 2011-06-29 | 2013-01-03 | パナソニック株式会社 | フィンチューブ型熱交換器 |
| CN103717993B (zh) * | 2011-08-01 | 2016-04-27 | 松下电器产业株式会社 | 翅片管型热交换器 |
| WO2013018270A1 (ja) * | 2011-08-01 | 2013-02-07 | パナソニック株式会社 | フィンチューブ型熱交換器 |
| CN103717993A (zh) * | 2011-08-01 | 2014-04-09 | 松下电器产业株式会社 | 翅片管型热交换器 |
| JPWO2013018270A1 (ja) * | 2011-08-01 | 2015-03-05 | パナソニック株式会社 | フィンチューブ型熱交換器 |
| JP2013100964A (ja) * | 2011-11-09 | 2013-05-23 | Sumitomo Light Metal Ind Ltd | 空気調和機用サーペンタイン熱交換器 |
| CN103946662A (zh) * | 2011-11-09 | 2014-07-23 | 株式会社Uacj | 空调用蛇管式换热器 |
| WO2013069358A1 (ja) * | 2011-11-09 | 2013-05-16 | 住友軽金属工業株式会社 | 空気調和機用サーペンタイン熱交換器 |
| CN103946662B (zh) * | 2011-11-09 | 2017-11-03 | 株式会社Uacj | 空调用蛇管式换热器 |
| JPWO2019176061A1 (ja) * | 2018-03-15 | 2020-12-17 | 三菱電機株式会社 | 熱交換器及び冷凍サイクル装置 |
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Also Published As
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|---|---|
| US20090199585A1 (en) | 2009-08-13 |
| JPWO2007108386A1 (ja) | 2009-08-06 |
| EP2006629A2 (en) | 2008-12-24 |
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