WO2009144909A1 - フィンチューブ型熱交換器 - Google Patents
フィンチューブ型熱交換器 Download PDFInfo
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- WO2009144909A1 WO2009144909A1 PCT/JP2009/002292 JP2009002292W WO2009144909A1 WO 2009144909 A1 WO2009144909 A1 WO 2009144909A1 JP 2009002292 W JP2009002292 W JP 2009002292W WO 2009144909 A1 WO2009144909 A1 WO 2009144909A1
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- heat transfer
- cut
- height
- airflow
- fin
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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
- F28F1/325—Fins with openings
Definitions
- the present invention relates to a finned-tube heat exchanger, in particular, a plurality of heat transfer fins arranged in the airflow with a gap in the plate thickness direction, and inserted in the plurality of heat transfer fins in the airflow direction.
- a plurality of heat transfer tubes arranged in a substantially orthogonal direction, and a plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the airflow direction on both sides in the vertical direction of the heat transfer tubes on the heat transfer fin surface
- the present invention relates to a finned tube heat exchanger formed by cutting and raising.
- the air flow in the vicinity of the heat transfer tubes 103 is transferred to the heat transfer tubes 103 on both sides of the heat transfer fin surfaces 102 b in the vertical direction of the heat transfer tubes 103.
- Cut and raised portions 104a to 104c and 104d to 104f that are inclined with respect to the air flow direction are formed by the cut and raised processing so as to be guided to the rear side in the air flow direction, and further, a heat medium such as air and refrigerant.
- a heat medium such as air and refrigerant.
- the drainage performance is deteriorated.
- 04a ⁇ 104c, the 104d ⁇ 104f are those arranged divided into three toward the downstream side from the flow direction upstream side of the air flow.
- the height of 104f from the heat transfer fin surface is formed so as to gradually increase over the entire downstream side in the air flow direction (see Japanese Patent Application Laid-Open No. 2008-111646 as Patent Document 1).
- the finned tube heat exchanger includes a plurality of heat transfer fins and a plurality of heat transfer tubes.
- the heat transfer fins are arranged in the airflow side by side with a space in the thickness direction.
- the heat transfer tubes are inserted into the plurality of heat transfer fins, and are arranged in a direction substantially orthogonal to the airflow direction.
- Each heat transfer fin has a plurality of cut-and-raised parts arranged on the both sides in the vertical direction of the heat transfer tube from the upstream side to the downstream side in the airflow direction.
- the raising portion is inclined with respect to the airflow direction so that the airflow in the vicinity of the heat transfer tube is guided to the rear side in the airflow direction of the heat transfer tube, and each cut and raised portion is downstream in the airflow direction.
- the height from the heat transfer fin surface From the heat transfer fin surface at the front end height, which is the height from the heat transfer fin surface at the front end in the airflow direction, and at the rear end in the airflow direction, the height from the heat transfer fin surface gradually increases
- the value obtained by dividing the average height of the rear end height, which is the height of the above, by the fin pitch, which is the distance between the heat transfer fins, is larger than 0.3 and smaller than 0.6.
- the height from the heat transfer fin surface of the plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the air flow direction is gradually increased toward the downstream side in the air flow direction.
- Adopting the structure formed in the heat transfer fin makes it easier to obtain a guide action that guides the air flow in the vicinity of the heat transfer tube to the rear side in the flow direction of the air flow of the heat transfer tube, and reduces the dead water area, The purpose of this is to prevent as much as possible the increase in ventilation resistance at the cut-and-raised part on the upstream side in the air flow direction. With the adoption of such a configuration, the heat transfer at the cut and raised part on the upstream side in the air flow direction. If the height from the fin surface is too low, the effect of generating a vertical vortex behind the cut-and-raised portion is reduced, and there is a problem that it becomes difficult to obtain the effect of promoting heat transfer by the vertical vortex.
- the heat transfer performance and the ventilation performance by the cut-and-raised parts are compatible. It is necessary to determine the height of each cut-and-raised part from the heat transfer fin surface, and without considering this viewpoint, the transfer of a plurality of cut-and-raised parts lined up from the upstream side to the downstream side in the air flow direction is considered. It is not preferable to form the cut-and-raised part in the heat transfer fin so that the height from the surface of the heat fin gradually increases toward the downstream side in the air flow direction.
- the inventor of the present application has a plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the airflow direction so that the airflow in the vicinity of the heat transfer tube is guided to the rear side in the airflow direction of the heat transfer tube.
- the heat transfer performance of the cut-and-raised part was evaluated in consideration of the ventilation resistance, and the airflow was It is assumed that the height from the heat transfer fin surface gradually increases toward the downstream side in the flow direction (that is, the flow of the airflow is higher than the front end height, which is the height from the heat transfer fin surface at the front end in the flow direction of the airflow)
- the rear end height which is the height from the heat transfer fin surface at the rear end in the direction, is higher), and the value obtained by dividing the average height of the front end height and the rear end height by the fin pitch is 0.3. Greater than and less than 0.6 With shall, we found that it is possible to increase the heat transfer performance per ventilation resistance.
- a plurality of cut and raised parts arranged so as to be inclined with respect to the flow direction of the air flow so that the air flow near the heat transfer tube is guided to the rear side in the flow direction of the air flow of the heat transfer tube.
- the cut-and-raised part on the upstream side in the airflow direction Does not reduce the height from the heat transfer fin surface of the cut-and-raised part on the upstream side in the flow direction of the airflow, thereby increasing the effect of generating a vertical vortex behind the cut-and-raised part, Heat transfer performance per ventilation resistance can be improved (that is, heat transfer performance can be improved while suppressing increase in ventilation resistance as much as possible).
- the heat transfer performance by the cut-and-raised portion and the ventilation performance can be made compatible, and high performance can be achieved.
- the finned tube heat exchanger according to a second aspect of the present invention is the finned tube heat exchanger according to the first aspect of the present invention, wherein the inclination angle formed by the ridge of each cut and raised portion and the heat transfer fin surface is 30 Less than degrees.
- the relationship between the average height and the fin pitch is applied on the assumption that the rear end height is higher than the front end height, for example, When the height of the front end of the cut and raised portion is very low, the rear end height of the cut and raised portion must be increased, so that the angle between the ridge of the cut and raised portion and the heat transfer fin surface A certain tilt angle is increased.
- a plurality of cut and raised parts arranged so as to be inclined with respect to the flow direction of the air flow so that the air flow near the heat transfer tube is guided to the rear side in the flow direction of the air flow of the heat transfer tube. Since the above-described inclination angle condition is further applied to each of the parts, the effect of improving the heat transfer performance per ventilation resistance by applying the above-described relationship between the average height and the fin pitch can be reliably obtained. be able to.
- the finned tube heat exchanger according to the third invention is the finned tube heat exchanger according to the first or second invention, wherein the plurality of cut-and-raised portions have an average height of each cut-and-raised portion, Of the cut-and-raised parts, the cut-and-raised parts on the downstream side in the airflow direction are arranged so as to be sequentially larger than the cut-and-raised parts on the upstream side in the airflow direction.
- each cut-and-raised part is only defined, for example, among the plurality of cut-and-raised parts, the airflow direction upstream side
- the height of the cut-and-raised part from the heat transfer fin surface may be higher than the height of the cut-and-raised part downstream of the airflow direction from the heat transfer fin surface.
- the flow direction of the airflow is more than the cut-and-raised part of the plurality of cut-and-raised parts having an average height of each cut-and-raised part of the plurality of cut-and-raised parts upstream of the airflow direction.
- FIG. 4 is a sectional view taken along the line II in FIG. 3.
- FIG. 4 is a diagram schematically showing a II-II section or a III-III section in FIG. 3. It is a figure which shows the influence on the heat-transfer promotion of the shape (average height) of a cut and raised part. It is a figure which shows the influence on the heat transfer promotion of the shape (tilt angle) of a cut-and-raised part.
- FIG. 3 is a cross-sectional view of the finned tube heat exchanger 1.
- 4 is a cross-sectional view taken along the line II of FIG.
- FIG. 5 is a diagram schematically showing the II-II section or the III-III section of FIG.
- FIG. 6 is a diagram showing the influence of the shape (average height) of the cut-and-raised portion on the heat transfer promotion.
- FIG. 7 is a diagram showing the influence of the shape (tilt angle) of the cut-and-raised portion on the heat transfer promotion.
- the fin tube type heat exchanger 1 is a cross fin and tube type heat exchanger, and mainly includes a plurality of plate-shaped heat transfer fins 2 and a plurality of heat transfer tubes 3. And.
- the heat transfer fins 2 are arranged side by side at a predetermined interval in the plate thickness direction with the plane thereof being generally along the flow direction of the airflow such as air.
- a plurality of through holes 2 a are formed in the heat transfer fins 2 at intervals in a direction substantially orthogonal to the airflow direction.
- a peripheral portion of the through hole 2 a is an annular collar portion 8 that protrudes to one side in the plate thickness direction of the heat transfer fin 2.
- the collar portion 8 is in contact with the surface opposite to the surface on which the collar portion 8 of the heat transfer fin 2 adjacent in the plate thickness direction is formed, and a predetermined interval (hereinafter, referred to as the plate thickness direction of the heat transfer fin 2). This predetermined interval is set as a fin pitch FP).
- the heat transfer tube 3 is a tube member through which a heat medium such as a refrigerant flows.
- the heat transfer tube 3 is inserted into the plurality of heat transfer fins 2 and is disposed in a direction substantially orthogonal to the airflow direction. Specifically, the heat transfer tube 3 passes through the through holes 2 a formed in the heat transfer fins 2, and comes into close contact with the inner surface of the collar portion 8 by tube expansion work when the fin tube heat exchanger 1 is assembled. ing.
- the finned tube heat exchanger 1 of the present embodiment is used in a state where the plurality of heat transfer tubes 3 are arranged so that the arrangement direction thereof is substantially vertical (that is, FIG. Only two of the heat transfer tubes 3 are shown). For this reason, the airflow flows so as to cross the finned tube heat exchanger 1 in a substantially horizontal direction.
- the arrangement direction of the heat transfer tubes 3 is indicated.
- the heat transfer fins 2 have a plurality of (in this embodiment) arranged from the upstream side to the downstream side in the airflow direction on both sides in the vertical direction of the heat transfer tubes 3 (that is, the lower side and the upper side of the heat transfer tubes 3).
- the three raised portions 4a to 4f on the lower side of the heat transfer tube 3 and the upper three on the heat transfer tube 3 are formed on the heat transfer fin surface 2b by the cut and raised process.
- the lower three raised portions of the heat transfer tube 3 are first cut and raised portions 4a to 4c
- the upper three raised portions of the heat transfer tube 3 are second cut and raised portions 4d to 4f.
- Each cut-and-raised portion 4a to 4f is a substantially trapezoidal portion formed by cutting the heat-transfer fin 2 and raising it in the direction extending in the plate thickness direction of the heat-transfer fin 2.
- the portions adjacent to the cut-and-raised portions 4a to 4f of the heat transfer fin 2 are provided with substantially trapezoidal slit holes 7a to 7f as the cut-and-raised portions 4a to 4f are cut and raised. It is formed to correspond to 4a to 4f.
- the first cut-and-raised portions 4a to 4c and the second cut-and-raised portions 4d to 4f are arranged in the airflow direction so that the airflow in the vicinity of the heat transfer tube 3 is guided rearward in the airflow direction of the heat transfer tube 3. It arrange
- the angle of attack ⁇ 2 with respect to the airflow direction of the second main cut and raised portions 4d to 4f is a positive value
- the second cut and raised portions 4d to 4f are on the straight line M2. They are arranged in a straight line.
- the angles of attack ⁇ 1 and ⁇ 2 are such that the front ends 5a to 5f in the airflow direction of the cut and raised portions 4a to 4f are more from the heat transfer tube 3 than the rear ends 6a to 6f in the airflow direction of the cut and raised portions 4a to 4f.
- the case where it inclines so that it may be located in a far side shall be a positive value.
- the heights of the cut and raised portions 4a to 4f from the heat transfer fin surface 2b gradually increase toward the downstream side in the airflow direction. More specifically, with respect to the first cut-and-raised portion 4a, the height from the heat transfer fin surface 2b of the rear end 6a is higher than the height from the heat transfer fin surface 2b of the front end 5a.
- the height from the heat-transfer fin surface 2b of the rear end 6b is higher than the height from the heat-transfer fin surface 2b of the front end 5b, and about the first cut-and-raised part 4c,
- the height of the rear end 6c from the heat transfer fin surface 2b is higher than the height from the heat transfer fin surface 2b
- the second cut and raised portion 4d is higher than the height of the front end 5d from the heat transfer fin surface 2b.
- the height of the rear end 6d from the heat transfer fin surface 2b is higher, and the second cut-and-raised portion 4e has a heat transfer fin surface of the rear end 6e that is higher than the height of the front end 5e from the heat transfer fin surface 2b.
- the height from 2b is high and the second cut
- the then portion 4f, the height from the heat transfer fin surface 2b of the rear end 6f is higher than the height of the heat transfer fin surface 2b of the front end 5f.
- the height from the heat transfer fin surface 2b at the front end in the airflow direction of each of the raised portions 4a to 4f is defined as the front end height a, and the height from the heat transfer fin surface 2b at the rear end in the airflow direction.
- Is the rear end height b, and the average value of the front end height a and the rear end height b is the average height H (see FIG. 5).
- a value divided by the fin pitch FP (that is, ⁇ (a + b) / 2 ⁇ / FP) is set to be larger than 0.3 and smaller than 0.6.
- the relationship between the average height H and the fin pitch FP in each of the cut-and-raised portions 4a to 4f is that the inventor of the present application has a plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the airflow direction.
- the air flow resistance is taken into consideration.
- the inventor of the present application has a plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the airflow direction so that the airflow in the vicinity of the heat transfer tube is guided to the rear side in the airflow direction of the heat transfer tube.
- the heat transfer performance of the cut-and-raised part was evaluated in consideration of the ventilation resistance, and the cut-and-raised part was added.
- the finned tube type heat exchanger 1 of this embodiment it arrange
- the relationship between the average height H and the fin pitch FP is applied to each of the plurality of cut and raised portions 4a to 4f on the assumption that the rear end height b is higher than the front end height a. Therefore, for the cut-and-raised portion on the upstream side in the airflow direction (for example, the cut-and-raised portions 4a and 4d arranged on the most upstream side in the airflow direction), the cut-and-raised portion on the upstream side in the airflow direction.
- the height from the heat transfer fin surface 2b is not reduced too much, thereby increasing the effect of generating a vertical vortex behind the cut-and-raised part and improving the heat transfer performance per ventilation resistance. Can KazuSatoshi, while suppressing as much as possible an increase in ventilation resistance can be improved heat transfer performance).
- the cut-and-raised portion on the downstream side in the airflow direction for example, the cut-and-raised portions 4c and 4f arranged on the most downstream side in the airflow direction
- the airflow in the vicinity of the heat transfer tube 3 is used as the airflow of the heat transfer tube.
- the height of the cut-and-raised portion from the heat transfer fin surface 2b is not excessively increased, and this improves the heat transfer performance per ventilation resistance. (That is, an increase in ventilation resistance can be suppressed while obtaining a guide effect as much as possible).
- the heat transfer performance and the ventilation performance by the cut-and-raised portions 4a to 4f can be made compatible, and the performance can be improved. Yes.
- the relationship between the above average height H and the fin pitch FP is applied on the assumption that the rear end height b is higher than the front end height a. Therefore, for example, when the front end height a of the cut and raised portion is very low, the rear end height b of the cut and raised portion has to be increased.
- the inclination angle ⁇ (see FIG. 5), which is the angle formed by the fin surface 2b, increases.
- the ridges of the cut-and-raised portions 4a to 4f are the front ends of the front-ends 5a to 5f of the cut-and-raised portions 4a to 4f and the ends farthest from the heat transfer fin surface 2b, and the back of the cut-and-raised portions 4a to 4f. It means a line connecting the ends of the ends 6a to 6f farthest from the heat transfer fin surface 2b.
- the inclination angle ⁇ is an angle between the ridges of the cut and raised portions 4a to 4f and the heat transfer fin surface 2b.
- the inventor of the present application evaluated the relationship between the inclination angle ⁇ and the heat transfer performance per ventilation resistance, and increased the ventilation resistance increase rate ⁇ Pa when the cut-and-raised portion was added to the heat when the cut-and-raised portion was added.
- the finned tube heat exchanger 1 of this embodiment it arrange
- each cut-and-raised portion 4a to 4f is defined (that is, the relationship between the above average height H and the fin pitch FP, or the above average height H and In the case of the relationship with the fin pitch FP and the above-described condition of the inclination angle ⁇ ), for example, among the first cut-and-raised parts 4a to 4c, the propagation of the cut-and-raised part on the upstream side in the airflow direction.
- the height of the cut-and-raised portion from the heat transfer fin surface 2b may be higher than the height of the cut-and-raised portion downstream of the airflow direction from the heat transfer fin surface 2b.
- On the upstream side of the airflow direction Compared to the case where a structure formed on the heat transfer fin is adopted so that the height from the heat transfer fin surface of the plurality of cut and raised portions arranged toward the downstream side gradually increases toward the downstream side in the air flow direction. There is a possibility that it is difficult to obtain a guide action for guiding the air flow in the vicinity of the heat transfer tube 3 to the rear side in the air flow direction of the heat transfer tube 3.
- the first cut-and-raised portions 4a to 4c have the average height H of the first cut-and-raised portions 4a to 4c of the first cut-and-raised portions 4a to 4c.
- the cut-and-raised parts on the downstream side in the flow direction of the airflow are arranged so as to be sequentially larger than the cut-and-raised parts on the upstream side in the airflow direction, and the second cut-and-raised parts 4d to 4f are arranged in the second cut and raised parts 4d to 4d.
- the average height H of 4f is arranged so that the cut-and-raised part on the downstream side in the airflow direction of the second cut-and-raised parts 4a to 4c is sequentially larger than the cut-and-raised part on the upstream side in the airflow direction. Since it is easy to obtain a guide action for guiding the airflow in the vicinity of the heat transfer tube 3 to the rear side in the airflow direction of the heat transfer tube 3, it is possible to reduce the dead water area. (3) Modifications In the above-described embodiment (see FIGS. 3 and 4), flat fins are employed as heat transfer fins, but the present invention is not limited to this, and waffle heat transfer fins are employed. Also good.
- the heat transfer fin 12 having folds 19a to 19c parallel to the vertical direction is adopted as the heat transfer fin.
- the three first cut-and-raised portions 14a to 14c arranged from the upstream side to the downstream side in the air flow direction are cut and raised to flow the air flow of the heat transfer fins 12.
- the f may be formed on the heat transfer fin surfaces 12c ⁇ 12e.
- the folds 19a to 19c are mountain folds, and the fold 19b is a valley fold.
- the cut-and-raised part is not formed on the heat transfer fin surface 12f.
- the present invention includes a plurality of heat transfer fins arranged in the airflow side by side at intervals in the plate thickness direction, and a plurality of heat transfer fins inserted in the plurality of heat transfer fins and arranged in a direction substantially orthogonal to the flow direction of the airflow.
- a plurality of cut-and-raised portions arranged from the upstream side to the downstream side in the air flow direction on both sides of the heat transfer tube in the vertical direction of the heat transfer tube. It is widely applicable to tube type heat exchangers.
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Abstract
Description
このように、このフィンチューブ型熱交換器では、切り起こし部による伝熱性能と通風性能とを両立させることができ、高性能化を図ることができる。
上述の第1の発明にかかるフィンチューブ型熱交換器では、前端高さよりも後端高さのほうが高いことを前提として上述の平均高さとフィンピッチとの関係が適用されているため、例えば、切り起こし部の前端高さを非常に低くした場合には、切り起こし部の後端高さを高くしなければならなくなり、これにより、切り起こし部の尾根と伝熱フィン面とがなす角度である傾斜角が大きくなる。
そこで、本願発明者は、傾斜角と通風抵抗当たりの伝熱性能との関係を評価し、傾斜角を30度より小さくすることで、通風抵抗当たりの伝熱性能を高く維持できることを見出した。
上述の第1又は第2の発明にかかるフィンチューブ型熱交換器では、切り起こし部ごとの形状が規定されているだけであるため、例えば、複数の切り起こし部のうち気流の流れ方向上流側の切り起こし部の伝熱フィン面からの高さが気流の流れ方向下流側の切り起こし部の伝熱フィン面からの高さよりも高くなる場合等が生じ得ることになり、これにより、気流の流れ方向上流側から下流側に向かって並ぶ複数の切り起こし部の伝熱フィン面からの高さが気流の流れ方向下流側に向かって全体にわたって漸増するように伝熱フィンに形成した構成を採用する場合に比べて、伝熱管近傍の気流を伝熱管の気流の流れ方向後側に案内するガイド作用が得られにくくなるおそれがある。
図3~図7に本発明の一実施形態にかかるフィンチューブ型熱交換器1の要部を示す。ここで、図3は、フィンチューブ型熱交換器1の断面図である。図4は、図3のI-I断面図である。図5は、図3のII-II断面又はIII-III断面を模式的に示した図である。図6は、切り起こし部の形状(平均高さ)の伝熱促進への影響を示す図である。図7は、切り起こし部の形状(傾斜角)の伝熱促進への影響を示す図である。
(1)フィンチューブ型熱交換器の基本構成
フィンチューブ型熱交換器1は、クロスフィンアンドチューブ型熱交換器であり、主として、複数のプレート状の伝熱フィン2と、複数の伝熱管3とを備えている。伝熱フィン2は、その平面を空気等の気流の流れ方向に概ね沿わせた状態で、板厚方向に所定の間隔を空けて並んで配置されている。伝熱フィン2には、気流の流れ方向に略直交する方向に間隔を空けて複数の貫通孔2aが形成されている。貫通孔2aの周囲部分は、伝熱フィン2の板厚方向の一方側に突出する環状のカラー部8となっている。カラー部8は、板厚方向に隣り合う伝熱フィン2のカラー部8が形成された面と反対の面に当接しており、伝熱フィン2の板厚方向間に所定の間隔(以下、この所定の間隔をフィンピッチFPとする)が確保されるようになっている。伝熱管3は、内部に冷媒等の熱媒体が流れる管部材であり、複数の伝熱フィン2に挿入されており、気流の流れ方向に略直交する方向に配置されている。具体的には、伝熱管3は、伝熱フィン2に形成された貫通孔2aを貫通しており、フィンチューブ型熱交換器1の組立時の拡管作業によって、カラー部8の内面に密着している。
(2)伝熱フィンの詳細形状
次に、本実施形態のフィンチューブ型熱交換器1に用いられている伝熱フィン2の詳細形状について説明する。
伝熱フィン2には、各伝熱管3の鉛直方向における両側(すなわち、各伝熱管3の下側および上側)において、気流の流れ方向上流側から下流側に向かって並ぶ複数(本実施形態では、伝熱管3の下側に3つ、伝熱管3の上側に3つ)の切り起こし部4a~4fが、切り起こし加工により、伝熱フィン面2bに形成されている。ここで、伝熱管3の下側の3つの切り起こし部を第1切り起こし部4a~4c、伝熱管3の上側の3つの切り起こし部を第2切り起こし部4d~4fとする。各切り起こし部4a~4fは、伝熱フィン2に切り込みを入れて伝熱フィン2の板厚方向に延びる方向に起こすことによって形成された略台形形状の部分である。そして、伝熱フィン2の各切り起こし部4a~4fに隣接する部分には、切り起こし部4a~4fが切り起こされるのに伴って、略台形形状のスリット孔7a~7fが各切り起こし部4a~4fに対応するように形成されている。
ところで、本実施形態のフィンチューブ型熱交換器1では、前端高さaよりも後端高さbのほうが高いことを前提として上述の平均高さHとフィンピッチFPとの関係が適用されているため、例えば、切り起こし部の前端高さaを非常に低くした場合には、切り起こし部の後端高さbを高くしなければならなくなり、これにより、切り起こし部の尾根と伝熱フィン面2bとがなす角度である傾斜角θ(図5参照)が大きくなる。ここで、各切り起こし部4a~4fの尾根とは、各切り起こし部4a~4fの前端5a~5fの伝熱フィン面2bから最も遠い側の先端と、各切り起こし部4a~4fの後端6a~6fの伝熱フィン面2bから最も遠い側の先端とを結ぶ線を意味している。また、傾斜角θは、各切り起こし部4a~4fの尾根と伝熱フィン面2bとの挟角である。
そこで、本願発明者は、傾斜角θと通風抵抗当たりの伝熱性能との関係を評価して、切り起こし部を付加した場合の通風抵抗の増加率ΔPaを切り起こし部を付加した場合の熱伝達率の増加率Δhaで除した値(すなわち、ΔPa/Δha)と傾斜角θとの間に、図7に示されるような関係を有することを見出し、この関係から通風抵抗当たりの伝熱性能を高く維持できる傾斜角θが30度より小さい範囲であることを導き出している。
また、本実施形態において、仮に、切り起こし部4a~4fごとの形状が規定されているだけ(すなわち、上述の平均高さHとフィンピッチFPとの関係、又は、上述の平均高さHとフィンピッチFPとの関係及び上述の傾斜角θの条件が適用されているだけ)の場合には、例えば、第1切り起こし部4a~4cのうち気流の流れ方向上流側の切り起こし部の伝熱フィン面2bからの高さが気流の流れ方向下流側の切り起こし部の伝熱フィン面2bからの高さよりも高くなる場合や第2切り起こし部4d~4fのうち気流の流れ方向上流側の切り起こし部の伝熱フィン面2bからの高さが気流の流れ方向下流側の切り起こし部の伝熱フィン面2bからの高さよりも高くなる場合等が生じ得ることになり、これにより、気流の流れ方向上流側から下流側に向かって並ぶ複数の切り起こし部の伝熱フィン面からの高さが気流の流れ方向下流側に向かって全体にわたって漸増するように伝熱フィンに形成した構成を採用する場合に比べて、伝熱管3近傍の空気流を伝熱管3の気流の流れ方向後側に案内するガイド作用が得られにくくなるおそれがある。
(3)変形例
上述の実施形態(図3及び図4参照)では、伝熱フィンとして平板状のフィンを採用しているが、これに限定されず、ワッフル形状の伝熱フィンを採用してもよい。
(4)他の実施形態
以上、本発明の実施形態及びその変形例について図面に基づいて説明したが、具体的な構成は、これらの実施形態及びその変形例に限られるものではなく、発明の要旨を逸脱しない範囲で変更可能である。
2、12 伝熱フィン
3 伝熱管
4a~4f、14a~14f 切り起こし部
a 前端高さ
b 後端高さ
FP フィンピッチ
H 平均高さ
θ 傾斜角
Claims (3)
- 板厚方向に間隔を空けて並べて気流中に配置される複数の伝熱フィン(2、12)と、
前記複数の伝熱フィンに挿入されており、気流の流れ方向に略直交する方向に配置される複数の伝熱管(3)とを備え、
前記各伝熱フィンには、前記伝熱管の鉛直方向における両側において、気流の流れ方向上流側から下流側に向かって並ぶ複数の切り起こし部(4a~4f、14a~14f)が、切り起こし加工により形成されており、
前記複数の切り起こし部は、前記伝熱管近傍の気流が、前記伝熱管の気流の流れ方向後側に案内されるように気流の流れ方向に対して傾斜しており、
前記各切り起こし部は、気流の流れ方向下流側に向かって前記伝熱フィン面からの高さが漸増しており、気流の流れ方向の前端における前記伝熱フィン面からの高さである前端高さと気流の流れ方向の後端における前記伝熱フィン面からの高さである後端高さとの平均高さを前記伝熱フィン間の間隔であるフィンピッチで除した値が、0.3より大きく、かつ、0.6より小さくなっている、
フィンチューブ型熱交換器(1)。 - 前記各切り起こし部(4a~4f、14a~14f)の尾根と前記伝熱フィン面とがなす角度である傾斜角は、30度より小さい、請求項1に記載のフィンチューブ型熱交換器(1)。
- 前記複数の切り起こし部(4a~4f、14a~14f)は、前記各切り起こし部の前記平均高さが、前記複数の切り起こし部のうち気流の流れ方向上流側の切り起こし部よりも気流の流れ方向下流側の切り起こし部のほうが順次大きくなるように配置されている、請求項1又は2に記載のフィンチューブ型熱交換器(1)。
Priority Applications (5)
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ES09754418T ES2746909T3 (es) | 2008-05-27 | 2009-05-25 | Intercambiador de calor de tubo y de aleta |
EP09754418.3A EP2314973B1 (en) | 2008-05-27 | 2009-05-25 | Fin-tube heat exchanger |
CN2009801175392A CN102027307A (zh) | 2008-05-27 | 2009-05-25 | 翅片管型热交换器 |
AU2009252652A AU2009252652B2 (en) | 2008-05-27 | 2009-05-25 | Fin tube type heat exchanger |
US12/993,590 US20110067849A1 (en) | 2008-05-27 | 2009-05-25 | Fin tube type heat exchanger |
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JP2008138145A JP5304024B2 (ja) | 2008-05-27 | 2008-05-27 | フィンチューブ型熱交換器 |
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JP (1) | JP5304024B2 (ja) |
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NO336628B1 (no) * | 2012-12-07 | 2015-10-12 | Sundseth Eiendom As | Varmeveksler |
CN106716042B (zh) * | 2014-09-08 | 2019-04-05 | 三菱电机株式会社 | 热交换器以及热交换器的板状翅片的制造方法 |
US9620764B2 (en) | 2015-01-05 | 2017-04-11 | Johnson Controls Technology Company | Battery module cooling fins and footings system and method |
WO2017179399A1 (ja) * | 2016-04-15 | 2017-10-19 | 三菱電機株式会社 | 熱交換器 |
JP2020535384A (ja) * | 2017-09-30 | 2020-12-03 | サンホワ(ハンチョウ) マイクロ チャンネル ヒート イクスチェンジャー カンパニー リミテッド | 熱交換器及びフィン |
CN108007258A (zh) * | 2017-10-18 | 2018-05-08 | 衢州学院 | 金属聚合物复合式微结构换热器的传热及成型方法 |
US11835306B2 (en) * | 2021-03-03 | 2023-12-05 | Rheem Manufacturing Company | Finned tube heat exchangers and methods for manufacturing same |
CN113758353A (zh) * | 2021-08-13 | 2021-12-07 | 博格思众(常州)热交换器有限公司 | 翅片、换热器和制冷系统 |
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KR20110010133A (ko) | 2011-01-31 |
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