WO2013187156A1 - フィン・アンド・チューブ型熱交換器用伝熱管及びそれを用いたフィン・アンド・チューブ型熱交換器 - Google Patents
フィン・アンド・チューブ型熱交換器用伝熱管及びそれを用いたフィン・アンド・チューブ型熱交換器 Download PDFInfo
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- WO2013187156A1 WO2013187156A1 PCT/JP2013/062918 JP2013062918W WO2013187156A1 WO 2013187156 A1 WO2013187156 A1 WO 2013187156A1 JP 2013062918 W JP2013062918 W JP 2013062918W WO 2013187156 A1 WO2013187156 A1 WO 2013187156A1
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- hole
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- fin
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- heat transfer
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
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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
Definitions
- the present invention relates to a heat transfer tube for a fin-and-tube heat exchanger and a fin-and-tube heat exchanger using the same, and more particularly to a fin-and-tube in an air conditioner such as a home air conditioner or a packaged air conditioner.
- the present invention relates to a heat transfer tube suitably used for a mold heat exchanger and a fin-and-tube heat exchanger using the same.
- heat exchangers that operate as evaporators or condensers, among them.
- fin-and-tube heat exchangers having a structure in which fins are assembled to heat transfer tubes have been most commonly used.
- heat exchangers using natural refrigerants with a low global warming potential have been developed in place of conventional chlorofluorocarbon refrigerants from the viewpoint of protecting the ozone layer and preventing global warming.
- hot water heaters using a refrigerant mainly composed of carbon dioxide gas have attracted attention and have been developed.
- the same fin-and-tube as described above is also used for air heat exchangers in such water heaters.
- a mold heat exchanger is used.
- such a fin-and-tube heat exchanger is generally used in a structure in which a fin (outer surface fin) subjected to predetermined processing and a heat transfer tube are used and the fin and the heat transfer tube are joined. It is becoming. And in the heat exchanger having such a structure, while circulating the refrigerant in the heat transfer tube, by flowing air as a heat exchange fluid along the fins in a direction perpendicular to the heat transfer tube, Heat exchange is performed between the refrigerant and the air.
- Hole tubes are known.
- the flat multi-hole tube is usually obtained by porthole extrusion of aluminum or an aluminum alloy.
- the cross-sectional shape of such a flat multi-hole tube is, for example, As disclosed in Japanese Laid-Open Patent Publication No. 6-142755 (Patent Document 1), a pipe having a rectangular flow path is generally used. Further, in such a flat multi-hole tube, in order to improve the heat exchange efficiency, it is effective to increase the surface area of the flow path.
- Patent Document 2 a square is used. A structure that increases the surface area by forming a large number of minute irregularities on the inner surface of the hole has been clarified. By increasing the surface area of the flow path in this way, the contact area between the coolant that can circulate inside the hole and the surface of the hole is increased, and the heat transfer coefficient on the coolant side, that is, the heat between the coolant and the heat transfer tube. By improving the transfer rate, the heat exchange efficiency is improved.
- Patent Document 1 Japanese Patent Laid-Open No. 6-142755
- Patent Document 3 Japanese Patent Laid-Open No. 9-72680
- Patent Document 1 aims at extending the life of a multi-hole tube extrusion die and improving the size and accuracy of a product when performing extrusion molding of a multi-hole tube.
- a triangular cross-sectional shape is merely mentioned.
- Patent Document 2 relates to a porous flat tube that can obtain a predetermined thickness and a flat surface by rolling or compression, and that can improve tensile strength by work hardening to give appropriate hardness and elasticity.
- the hole shape is a cross-sectional shape of an isosceles triangle.
- the hole shape of the multi-hole pipe formed by extrusion processing is simply a triangular cross-sectional shape
- the hole shape is merely a cross-sectional shape of an isosceles triangle.
- no consideration has been given to the specific shape of the triangle or the heat transfer coefficient of the heat transfer tube.
- the hole formed in the flat multi-hole tube by the extrusion process has a triangular shape, the metal flow at the time of the extrusion process is not good, and the target triangular hole is formed. The manufacturing problem of difficulty is inherent.
- the present invention has been made in the background of such circumstances, and the problem to be solved is that the heat transfer coefficient on the refrigerant side can be effectively improved and the extrudability can be improved.
- a heat transfer tube for a fin-and-tube heat exchanger to which a fin made of aluminum or an alloy thereof is assembled is made of aluminum or an alloy thereof.
- the multi-hole tube having a flat cross-sectional shape as a whole, and a number of trapezoidal cross-sectional holes extending in the tube axis direction provided in the multi-hole tube are arranged in parallel to each other at a distance in the width direction.
- the length of the upper base of the hole is less than or equal to 1/2 of the length of the lower base, and the height of the hole is equal to or greater than the length of the lower base and the thickness of the multi-hole tube.
- the fin-and-tube heat exchanger heat transfer tube characterized in that it is configured, it is an gist thereof.
- adjacent ones of a plurality of holes provided in the multi-hole tube are mutually upside down.
- the trapezoidal cross-sectional shape is arranged.
- the cross-sectional shape of the hole is an isosceles trapezoidal shape.
- the hole has a trapezoidal shape in which the inner angle between the lower base and one leg is 90 °.
- the present invention provides a fin-and-tube heat exchanger in which a fin made of aluminum or an alloy thereof and a multi-hole tube made of aluminum or an alloy thereof and having a flat cross-sectional shape as a whole are assembled.
- the multi-hole tube is configured by arranging a large number of trapezoidal cross-sectional holes extending in the tube axis direction and arranged parallel to each other in the width direction, and the length of the upper base of the holes is The length of the bottom is 1 ⁇ 2 or less, and the height of the hole is equal to or more than the length of the bottom, and is 0.5 to 0.8 times the thickness of the multi-hole tube, Then, the ratio (D / h) of hydraulic diameter: D defined by dividing four times the cross-sectional area of the hole by the sum of the lengths of the side of the hole and the height of the hole: h (D / h) is 0. Fin-and-characterized by being configured to fall within the range of 40 to 0.85 Also tube heat exchanger, and the gist thereof
- a rectangular plate-like fin is used as the fin, and the fin is opened at one end of the plate-like fin.
- the multi-hole tube and the plate-like fin are assembled by fitting and fixing the multi-hole tube in a slit having a predetermined length provided on the plate.
- a corrugated fin having a corrugated shape is used as the fin, and a plurality of the corrugated fins and the multi-holes are used.
- a plurality of tubes are stacked alternately and joined together to be assembled.
- the hole having a trapezoidal cross-sectional shape is a ratio of the length of the upper base and the lower base in the trapezoidal shape. And the ratio of the height of the hole to the thickness of the heat transfer tube, and also the hydraulic diameter defined by dividing the hole cross section by four times the sum of the lengths of the sides of the hole: D and the hole.
- the ratio (D / h) to the height: h is set to an appropriate range.
- the portion with a small hole such as a portion with a small angle in the portion sandwiched between the bottom) and the leg, a portion sandwiched between the upper base and the two legs, which are less than half the length of the lower bottom, and the like Circulates, the area of the inner surface of the multi-hole tube that contacts per unit volume of the refrigerant increases, and between the refrigerant and the heat transfer tube Transmission ratio, i.e. the heat exchange efficiency of the heat transfer tube, it become possible to effectively improve. In addition, when the refrigerant passes through such a narrow hole portion, a local flow state can be induced, and thus the heat exchange efficiency can be increased more effectively.
- the hole shape is a trapezoidal shape
- a triangular shape is used. It is easier to produce a metal flow than manufacturing a flat multi-hole tube having a shape hole, and the extrudability can be advantageously improved.
- the heat transfer coefficient on the refrigerant side in the heat-transfer tube is From the point of being advantageously improved, the high heat exchange performance is exhibited, and the effects such as downsizing and weight reduction of the heat exchanger and reduction of the manufacturing cost are advantageously exhibited.
- FIG. 2 is an explanatory cross-sectional view showing an enlarged part of a cross section of a flat multi-hole tube constituting the fin-and-tube heat exchanger shown in FIG. 1.
- FIG. 1 It is front explanatory drawing which shows roughly the fin and tube type heat exchanger for heat exchange performance evaluation used in the Example.
- FIG. 1 is a perspective view schematically showing one embodiment of a fin-and-tube heat exchanger using a heat-transfer tube for a fin-and-tube heat exchanger according to the present invention.
- two flat multi-hole tubes 14 and 14 are slits provided in the fins 12 with respect to the plurality of fins 12 arranged in parallel to each other and at a predetermined distance. It is configured by being inserted into and fixed to the assembly hole 16.
- the fin 12 is formed of a metal material made of aluminum or an aluminum alloy, for example, an aluminum material having a JIS designation of A1000 series, A3000 series, A7000 series or the like, as shown in FIG. As shown, it is composed of thin plate-like fins having a rectangular planar shape.
- an assembly hole 16 into which the flat multi-hole tube 14 is assembled is formed in the fin 12 as a slit extending from one end of the rectangular fin 12 in the width direction of the fin 12 (left and right in FIG. 2). Has been.
- a collar portion 18 having a predetermined height is formed integrally with the fin 12 and is erected in a U-shape.
- the flat multi-hole tube 14 is formed of a metal material made of aluminum or an aluminum alloy, for example, an aluminum material such as JIS name A1000 series, A3000 series, A6000 series, It is composed of a multi-hole tube having a flat shape in which ten holes 20 extending in the tube axis direction are formed.
- the hole 20 has a trapezoidal cross-sectional shape as shown in FIG. 3 in which a cross-section in a direction perpendicular to the tube axis, that is, a part of a so-called cross-section is enlarged.
- the length of the upper base: a is less than or equal to 1/2 of the length of the lower base: b
- the height: h is equal to or greater than the length of the lower base: b.
- the height: h is set to be 0.5 to 0.8 times as long as the thickness: H of the flat multi-hole tube 14.
- the trapezoidal shape of the hole 20 is such that the height of the hole: h and the length of the lower base: b are the same length
- the length of the upper base: a is the length of the lower base: b.
- the shape is an isosceles trapezoid in which the length is 1 ⁇ 2 and the inner angles of both ends of each base (upper base, lower base) are equal.
- adjacent holes 20 of the holes 20 having such a shape are mutually spaced apart at a predetermined interval in the width direction of the flat multi-hole tube 14 in a form in which the vertical direction is inverted. They are arranged in parallel.
- the hole shape of the hole 20 of the flat multi-hole tube 14 is changed to the trapezoidal upper base length: a, lower base length: b, hole height: h, and flat multi-hole tube 14 thickness.
- the ratio of the length: H, and further the ratio (D / h) of the hydraulic diameter: D to the height of the hole: h (D / h) is set to be a value within the above range, whereby the narrow portion of the hole 20 is cooled. Is effectively passed, and the area of the inner surface of the hole in contact with the unit volume of the refrigerant increases, and the heat transfer coefficient between the refrigerant and the heat transfer tube is advantageously improved. Moreover, since a local fluid state generate
- the length (a) of the upper base exceeds 1/2 of the length (b) of the lower base, or the hole height (h) is the length of the lower base (b ),
- the refrigerant easily passes through the hole 20, so that it is difficult to sufficiently transfer the heat between the refrigerant and the heat transfer tube.
- the hole height (h) is less than 0.5 times the thickness (H) of the heat transfer tube, the hole becomes too small, which makes it difficult to manufacture.
- the hole height (h) is larger than 0.8 times the thickness (H) of the heat transfer tube, the upper and lower thicknesses of the flat multi-hole tube 14 become too thin. This makes it difficult to manufacture.
- the length (a) of the upper base of the trapezoidal shape of the hole 20 is preferably 0.1 mm or more. This is because if the length (a) is smaller than 0.1 mm, the metal flow during the extrusion process deteriorates, and it becomes difficult to produce the intended flat multi-hole tube. .
- the target fin-and-tube heat exchanger 10 is configured by fitting the flat multi-hole tube 14 into the assembly holes 16 that are aligned with each other and fixedly assembling them. It is.
- the flat assembly of the multi-hole tube 14 and the fins 12 is performed by various known methods such as joining by caulking or brazing or fixing by an adhesive. Thus, it will be completed as an integral fin and tube heat exchanger.
- both end portions of the flat multi-hole tube 14 which is a heat transfer tube constituting such a fin-and-tube heat exchanger are respectively connected to a header (not shown), and the flat multi-hole tube 14 10
- the ten holes 20, that is, the ten flow paths through which the refrigerant extending in the tube axis direction is circulated are combined on the refrigerant inlet side and the outlet side to form the fin-and-tube heat exchanger 10. It is.
- the shape of the hole 20 formed in the flat multi-hole tube 14 is simply the contact between the refrigerant and the inner surface of the hole.
- the flat multi-hole tube 14 has a trapezoidal shape that not only increases the area but also increases the contact area per unit volume of the refrigerant to advantageously improve the heat transfer coefficient on the refrigerant side.
- the heat exchange efficiency between the refrigerant circulating in the pipe and the heat transfer pipe is effectively improved, and as a result, the heat exchange performance of the heat exchanger 10 can be advantageously enhanced.
- the hole 20 formed in the flat multi-hole tube 14 has a trapezoidal shape, the problem that the metal flow deteriorates and the workability deteriorates at the time of extrusion is advantageously solved. Or it will be avoided and high extrudability will be exhibited. Further, by using the flat multi-hole tube 14 exhibiting such a high heat transfer rate, the heat exchanger 10 can be reduced in size and weight, and the effect of reducing the manufacturing cost can be advantageously exhibited. .
- the fin-and-tube heat exchanger 10 is illustrated in which the flat multi-hole tube 14 is assembled in the assembly hole 16 provided in the plate-like fin 12.
- a corrugated fin type fin-and-tube heat exchanger 30 constructed by assembling corrugated (corrugated) fins 24 between flat multi-hole tubes 22, 22. It is also possible.
- the shape of the hole 20 formed in the flat multi-hole tube 14 is the same as the hole height (h) and the length of the lower base (b) in the above embodiment, and the length of the upper base.
- (A) is an isosceles trapezoidal shape in which the length of the bottom base (b) is 1 ⁇ 2 and the inner angles of both ends of each base are the same, but the hydraulic diameter: D and the hole
- the ratio of height: h (D / h) is a trapezoidal shape within the specified range in the present invention, in addition to the isosceles trapezoid illustrated, the angles of the inner angles at both ends of the base (lower base)
- Various trapezoidal shapes such as trapezoids having different angles and trapezoids in which the inner angle between the base (lower base) and one leg is a right angle are appropriately selected.
- each side (base, leg) of the trapezoid is linear, but if D / h satisfies the relationship described above, a circle having a predetermined radius of curvature. It can also be an arcuate side.
- the inner surface of the hole 20 is a flat surface here, but may be a surface on which minute irregularities (grooves and ridges) are formed. By forming such irregularities, the contact area between the refrigerant per unit volume and the surface of the hole 20 can be further increased, and the heat transfer coefficient between the refrigerant and the heat transfer tube can be improved more effectively. Become.
- an aluminum alloy JIS A3003
- JIS A3003 is extruded to exhibit a cross-sectional shape as shown in FIG. :
- Extruded flat multi-hole tube 40 having a thickness of 16 mm, a thickness (H) of 1.9 mm, and a number of holes of 12 was prepared. It was set to 1.
- the shape of the twelve holes (42) provided in 1 is as follows: upper base (a): 0.6 mm, lower base (b): 1.2 mm, height (h): 1.2 mm (heat transfer tube thickness It was made to be an isosceles trapezoid.
- the hole height (h) is the hole height in the thickness direction of the flat multi-hole tube (40), and the flow path area is the per-hole in the cross section perpendicular to the axial direction.
- the cross-sectional area of the hole portion and the wet edge length indicate the length of the side of the hole per hole in the cross section.
- heat transfer tube 44 and 46 having a cross-sectional shape as shown in FIGS. 5 (b) and 5 (c) are prepared.
- Heat transfer tube no. It was set to 3.
- heat transfer tube no. 2 is an extruded flat multi-hole tube having a width (W): 16 mm, a thickness (H): 1.9 mm, and the number of holes: 20, and the hole shapes thereof are an upper base: 0.1 mm and a lower base: 0.0.
- heat transfer tube No. 3 is an extruded flat multi-hole tube having a width (W): 16 mm, a thickness (H): 1.9 mm, and a number of holes: 14, and the hole shapes thereof are an upper base: 0.4 mm and a lower base: 0.0. 7 mm, height: 1.5 mm, and a trapezoidal shape with an inner angle of 90 ° between the base and one leg.
- the heat transfer tubes 2 and 3 are flat multi-hole tubes that have the same width (W) and thickness (H) as the heat transfer tubes 1 but differ in the hole shape and the number of holes.
- the heat transfer tube No. 2 and 3 are heat transfer tube Nos. 1 was produced by extruding an aluminum alloy (JIS A3003).
- JIS A3003 aluminum alloy
- the heat transfer tube No. The specifications such as the channel area and hydraulic diameter in 2 and 3 are shown in Table 1 below.
- a flat multi-hole tube 52 having a circular hole shape (a circle having a diameter of 1.2 mm) is prepared.
- the hole shape is a trapezoidal shape
- the flat multi-hole tube having a hole shape as shown in FIGS. 7 (a) and 7 (b) assuming that the value of D / h is outside the scope of the present invention. 54 and 56 were prepared. 6.
- a plurality of flat multi-hole tubes (22) are arranged in parallel to each other as shown in FIG.
- a heat exchanger (30) in which corrugated fins (24) molded into a corrugated shape are joined between flat multi-hole tubes (22, 22) that match each other is referred to as a heat exchanger No. 1, respectively. 1 to 7 were produced.
- both ends of the arranged flat multi-hole pipes (22) are respectively connected to the header (26), and the respective holes (in the axial direction of the flat multi-hole pipe (22) ( Are formed on the refrigerant inlet side and the outlet side to form a refrigerant flow path.
- the fins (24) are all corrugated processed brazing sheets using JIS A3703 series alloy for the core material and JIS A4045 series alloy for the skin material.
- 75 flat multi-hole tubes (24) were used.
- the fin (24) and the flat multi-hole tube (22) are joined to the fin (24) and the flat multi-hole tube (22) laminated and assembled in the shape of the target heat exchanger (30).
- the assembly (2) is heated and held at 600 ° C. for 3 minutes in a brazing furnace (the highest temperature reached) for 3 minutes, and then cooled, whereby the fin (24) and the flat multi-hole tube (22) are brazed. It was made to join.
- the length of the flat multi-hole tube (22) between the headers (26, 26) is 610 mm
- the overall size of the heat exchanger (30) is width: 650 mm and height: 610 mm. I did it.
- test results for each heat exchanger are shown in Table 2 below.
- the test result shown in this Table 2 shows heat exchanger No.2 whose hole shape of a flat multi-hole pipe is a square. It is shown in a ratio to the case where the heat exchange amount of 4 is 100.
- the heat exchanger No. 2 has the same flow path area but different hole shapes formed in the flat multi-hole tube.
- the heat exchanger No. 1 having a trapezoidal hole shape according to the present invention No. 1 is a heat exchanger No. 1 having a square hole shape. 4 or circular heat exchanger No. 4 It was confirmed that the condensation performance was greatly improved than 5.
- the hole shape is a trapezoidal shape, and the ratio of hydraulic diameter: D to hole height: h: D / h is configured using flat multi-hole tubes 40, 44, 46 within the scope of the present invention.
- Each heat exchanger No. 1, heat exchanger no. 2 and heat exchanger no. No. 3 is a heat exchanger No.
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Abstract
Description
12 フィン
14 扁平多穴管
16 組付け孔
18 カラー部
20 穴
Claims (7)
- アルミニウム若しくはその合金からなるフィンが組み付けられるフィン・アンド・チューブ型熱交換器用伝熱管にして、
アルミニウム若しくはその合金からなる、全体として扁平な断面形状の多穴管にて構成され、且つ該多穴管に設けられた管軸方向に延びる台形断面形状の多数の穴が、幅方向に離間して互いに平行に配列されてなると共に、かかる穴の上底の長さは下底の長さの1/2以下であり、更に該穴の高さは、下底の長さと同等以上で、且つ該多穴管の厚さの0.5~0.8倍であり、そしてかかる穴の断面積の4倍を該穴の辺の長さの和で除することによって定義される水力直径:Dと該穴の高さ:hとの比(D/h)が、0.40~0.85の範囲内となるように構成されていることを特徴とするフィン・アンド・チューブ型熱交換器用伝熱管。 - 前記多穴管に設けられた多数の穴の隣り合うものが、相互に、上下逆転した台形断面形状となる関係において配設されている請求項1に記載のフィン・アンド・チューブ型熱交換器用伝熱管。
- 前記穴の横断面形状が、等脚台形形状である請求項1又は請求項2に記載のフィン・アンド・チューブ型熱交換器用伝熱管。
- 前記穴の横断面形状が、下底と一方の脚との内角が90°となる台形形状である請求項1又は請求項2に記載のフィン・アンド・チューブ型熱交換器用伝熱管。
- アルミニウム若しくはその合金からなるフィンと、アルミニウム若しくはその合金からなる、全体として扁平な断面形状の多穴管とを組み付けてなるフィン・アンド・チューブ型熱交換器にして、
前記多穴管が、管軸方向に延びる台形断面形状の多数の穴を、幅方向に離間して互いに平行に配列して、構成されていると共に、かかる穴の上底の長さは下底の長さの1/2以下であり、更に該穴の高さは、下底の長さと同等以上で、且つ該多穴管の厚さの0.5~0.8倍であり、そしてかかる穴の断面積の4倍を該穴の辺の長さの和で除することによって定義される水力直径:Dと該穴の高さ:hとの比(D/h)が、0.40~0.85の範囲内となるように構成されていることを特徴とするフィン・アンド・チューブ型熱交換器。 - 前記フィンとして、矩形の板状フィンを用いると共に、該板状フィンの一端に開口するように設けられた所定長さのスリット内に前記多穴管を嵌め込んで、固定することにより、それら多穴管と板状フィンとが組付けられている請求項5に記載のフィン・アンド・チューブ型熱交換器。
- 前記フィンとして、波形形状のコルゲートフィンを用いると共に、該コルゲートフィンの複数と前記多穴管の複数とが交互に積層されて、互いに接合することによって、組み付けられている請求項5に記載のフィン・アンド・チューブ型熱交換器。
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