EP2295919A2 - Lamelle und Wärmetauscher damit - Google Patents

Lamelle und Wärmetauscher damit Download PDF

Info

Publication number: EP2295919A2
Authority: EP; European Patent Office
Prior art keywords: circular arc; fin; straight; segment; segments
Prior art date: 2009-08-13
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP10007986A

Other languages

English (en)

French (fr)

Other versions

EP2295919B1 (de

EP2295919A3 (de

Inventor

Jiang Jianlong

Lin-Jie Huang

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd

Danfoss AS

Original Assignee

Danfoss Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2009-08-13

Filing date

2010-07-30

Publication date

2011-03-16

2010-07-30 Application filed by Danfoss Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd filed Critical Danfoss Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd

2011-03-16 Publication of EP2295919A2 publication Critical patent/EP2295919A2/de

2014-03-26 Publication of EP2295919A3 publication Critical patent/EP2295919A3/de

2015-06-17 Application granted granted Critical

2015-06-17 Publication of EP2295919B1 publication Critical patent/EP2295919B1/de

Status Active legal-status Critical Current

2030-07-30 Anticipated expiration legal-status Critical

Links

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Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
- F28F1/128—Fins with openings, e.g. louvered fins
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
- F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators

Definitions

the present invention relates to a fin and a heat exchanger having the same.
the headers of the heat exchanger of the parallel flow type are conventionally disposed horizontally and the tubes thereof are disposed vertically between the headers.
Fig. 10 is a structural schematic view of the conventional heat exchanger and Fig. 11 is an enlarged view of Portion G' in Fig. 10 .
the headers 3a' and 3b are disposed horizontally, parallel to and spaced from each other, and the tubes 2' are disposed vertically and parallel to each other between the headers 3a' and 3b', in which fins 1' are disposed between adjacent tubes 2' respectively.
the conventional disposition manners of the headers and tubes are not suitable for heat exchangers of some types such as prolate type (that is, heat exchanger having a length greater than a height thereof).
the headers should be very long such that the manufacturing costs thereof are high, and it is difficult to achieve a uniform distribution of the refrigerant. Since the headers do not participate ventilation and heat transfer, the longer the headers, the larger the area blocking the air flow, thus decreasing the effective heat-transfer area.
the tubes are short in length and large in number, that is, the number of the flow path of the refrigerant is large, so that the flow speed of the refrigerant in the tubes is low, thus causing poor heat-transfer performance.
the headers are disposed vertically and the tubes are disposed horizontally between the headers conventionally, thus decreasing the length of the headers, increasing the length of the tubes and decreasing the number of the tubes.
the conventional heat exchanger of prolate type with vertically disposed headers and horizontally disposed tubes employs conventional fins, there are some problems with the drainage of the condensation water. For example, as shown in Fig. 12 , if the air is blown along the direction D', due to the surface tension of the condensation water, most condensation water will be accumulated at the leeward side (i.e. region F' shown in Fig. 12 of the heat exchanger) and can be not drained smoothly.
an object of the present invention is to provide a fin for a heat exchanger, in which the water drainage performance of the fin is improved.
an embodiment of the present invention provides a fin, comprising: straight segments, and substantially-circular arc segments connected with the straight segments in turn along a longitudinal direction such that the substantially-circular arc segments form wave crests and wave troughs of the fin respectively, in which the fin is divided in a lateral direction into a first end portion, in which a second end portion, and an intermediate portion between the first and second end portions, each of the substantially-circular arc segments at least forming the wave troughs in the first end portion is separated from a substantially-circular arc segment of a corresponding intermediate portion via a longitudinal slot, and in which a top of each of the substantially-circular arc segments at least forming the wave troughs in the first end portion is formed with a lateral slot along the lateral direction such that each of the substantially-circular arc segments at least forming the wave troughs in the first end portion is divided into a first straight portion and a second straight portion separated from each other.
the first straight portion and the straight segment connected therewith may be in the same plane and the second straight portion and the straight segment connected therewith may be in the same plane as well, and when the fin is disposed between adjacent tubes of a heat exchanger, one end of the fin may be extended beyond the tubes in the lateral direction, so that the condensation water may easily flow downwardly along the first and second straight portions and the straight segments to drop off the fin and may not be accumulated on the fin, thus improving the water drainage performance of the fin.
each of the substantially-circular arc segments at least forming the wave troughs in the second end portion is separated from a substantially-circular arc segment of a corresponding intermediate portion via the longitudinal slot, and a top of each of the substantially-circular arc segments at least forming the wave troughs in the second end portion is formed with the lateral slot along the lateral direction such that each of the substantially-circular arc segments at least forming the wave troughs in the second end portion is divided into a first straight portion and a second straight portion separated from each other.
each of the substantially-circular arc segments at least forming the wave troughs in the second end portion is divided into the first straight portion and the second straight portion, the first straight portion and the straight segment connected therewith may be in the same plane and the second straight portion and the straight segment connected therewith may be in the same plane as well, and when the fin is disposed between adjacent tubes of a heat exchanger, the condensation water may easily flow downwardly along the first and second straight portions and the straight segments to drop off the fin and may not be accumulated on the fin, thus further improving the water drainage performance of the fin.
each of the substantially-circular arc segments forming the wave crests and wave troughs in the first and second end portions is separated from a substantially-circular arc segment of a corresponding intermediate portion via the longitudinal slot, and a top of each of the substantially-circular arc segments forming the wave crests and the wave troughs of the first and second end portions is formed with a lateral slot along the lateral direction such that each substantially-circular arc segment of the first and second end portions is divided into the first straight portion and the second straight portion separated from each other.
a substantially-circular arc transition segment is connected between adjacent straight segment and substantially-circular, in which R> r, where R is a radius of the substantially-circular arc segment and r is a radius of the substantially-circular arc transition segment.
the central angle ⁇ of the substantially-circular arc segment is in a range of about 30° to about 170°. Therefore, the manufacture of the fin is more convenient.
each straight segment is formed with a window. Therefore, the heat-transfer coefficient may be further improved.
an embodiment of the present invention provides a heat exchanger, comprising: a first header disposed vertically; a second header disposed vertically and spaced apart from the first header; a plurality of tubes, two ends of each flat tube being connected and communicated with the first and second headers respectively; and a plurality of fins, each of which is disposed between adjacent tubes, and a first end portion of each fin extended out from a first side of the adjacent tubes in a lateral direction, wherein each fin comprises: straight segments; and substantially-circular arc segments connected with the straight segments in turn along a longitudinal direction such that the substantially-circular arc segments form wave crests and wave troughs of the fin respectively, wherein the fin is divided in a lateral direction into a first end portion, a second end portion, and an intermediate portion between the first and second end portions, wherein each of the substantially-circular arc segments at least forming the wave troughs in the first end portion is separated from a substantially-circular
a second end portion of each fin is extended out from a second side opposite to the first side of the adjacent tubes in the lateral direction. Therefore, the water drainage performance of heat exchanger may be further improved and it is not necessary to consider the air blowing direction during mounting.
the heat exchanger according to the embodiment of the invention also has other advantages described above with reference to the fin.
relative terms such as “longitudinal”, “lateral”, “right”, “left”, “lower”, “upper”, “horizontal”, “vertical”, “above”, “below”, “up”, “top”, “bottom” as well as derivative thereof (e.g., “horizontally”, “vertically”, “downwardly”, “upwardly”, etc.) should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present invention be constructed or operated in a particular orientation.
the fin 1 is substantially corrugated, and comprises straight segments 11, and substantially-circular arc segments 12 connected with the straight segments 11 in turn along a longitudinal direction B, in which the substantially-circular arc segments 12 form wave crests and wave troughs of the fin 1 respectively.
the fin 1 is divided in a lateral direction C into a first end portion 112, a second end portion 114, and an intermediate portion 113 between the first and second end portions 112, 114.
the width of the first end portion 112 in the lateral direction C is S1
the width of the second end portion 114 in the lateral direction C is S2.
S1, S2 and the width of the intermediate portion 113 in the lateral direction C may be determined according to the specific applications and may be not particularly limited in the present invention.
Each of the substantially-circular arc segments 12 at least forming the wave troughs in the first end portion 112 and a substantially-circular arc segment 12 of the corresponding intermediate portion 113, are split from each other in the up and down direction in Fig. 1 .
each of the substantially-circular arc segments 12 at least forming the wave troughs in the first end portion 112 is separated from a substantially-circular arc segment 12 of the corresponding intermediate portion 113 via a longitudinal slot 111 extended downwardly to the straight segments 11 as shown in Fig. 1 .
a lateral slot 110 is formed along the lateral direction C in a top of each of the substantially-circular arc segments 12 at least forming the wave troughs in the first end portion 112, and the lateral slot 110 is extended through the whole first end portion 112, such that each of the substantially-circular arc segments 12 at least forming the wave troughs in the first end portion 112 is divided into a first straight portion 12a and a second straight portion 12b separated from each other.
the first straight portion 12a and the straight segment 11 connected to the first straight portion 12a are in the same plane, and the second straight portion 12b and the straight segment 11 connected to the second straight portion 12b are in the same plane as well, as shown in Fig. 1 .
the substantially-circular arc segment 12 of the corresponding intermediate portion 113 is still substantially-circular arcuate.
the first end portion 112 of the fin 1 may be extended out from a first side of the adjacent tubes 2 (i.e. the right side in Fig. 8 ) along the lateral direction C, that is, the first end portion 112 of the fin 1 may be extended beyond the tubes 2 in the lateral direction C.
each of the substantially-circular arc segments 12 at least forming the wave troughs in the first end portion 112 is divided into the first straight portion 12a and the second straight portion 12b, the surface tension of the condensation water is destroyed, so that when the air is blown along a direction D, the condensation water may not be accumulated at Area F of the fin 1, and may easily flow downwardly along the straight segments 11, and the first and second straight portions 12a, 12b to drop off the fin 1, thus improving the water drainage performance of the fin 1.
each of the substantially-circular arc segments 12 at least forming the wave crests in the first end portion 112 is also divided into a first straight portion 12a and a second straight portion 12b via the longitudinal slot 111 and the lateral slot 110, such that when the fin 1 is disposed between adjacent tubes 2, the surface tension of the condensation water is destroyed by the first straight portion 12a and the second straight portion 12b, and the condensation water may easily flow downwardly along the first and second straight portions 12a, 12b of the substantially-circular arc segments 12 forming the wave crests, the straight segments 11, and the first and second straight portions 12a, 12b of the substantially-circular arc segments 12 forming the wave troughs, so as to drop off the fin 1, thus further reducing the possibility of the accumulating of the condensation water in Area F of the fin 1 and improving the water drainage performance of the fin 1.
each of the substantially-circular arc segments 12 at least forming the wave troughs in the second end portion 114 of the fin 1 is also divided into a first straight portion 12a and a second straight portion 12b via the longitudinal slot 111 and the lateral slot 110.
each of the substantially-circular arc segments 12 at least forming the wave crests in the second end portion 114 is also divided into a first straight portion 12a and a second straight portion 12b via the longitudinal slot 111 and the lateral slot 110.
the second end portion 114 may be extended out from a second side of the tubes 2 (i.e. the left side in Fig. 8 ) along the lateral direction C, that is, the second end portion 114 of the fin 1 may be extended beyond the tubes 2 in the lateral direction C. Because each of the substantially-circular arc segments 12 forming the wave troughs or both the wave troughs and the wave crests in the second end portion 114 is divided into the first straight portion 12a and the second straight portion 12b, the surface tension of the condensation water is destroyed. For example, when air is blown along a direction opposite to the direction D (i.e. the leftward direction in Fig.
the condensation water may not be accumulated in an area symmetrical to Area F of the fin 1, and may easily flow downwardly along the first and second straight portions 12a, 12b of the second end portion 114 and the straight segments 11 to drop off the fin 1, thus further improving the water drainage performance of the fin 1.
each of the substantially-circular arc segments 12 forming the wave troughs or both the wave troughs and the wave crests in both the first end portion 112 and the second end portion 114 of the fin 1 is divided into the first straight portion 12a and the second straight portion 12b, and when the fin 1 is disposed between adjacent tubes 2, both the first end portion 112 and the second end portion 114 are extended out from the two sides of the tubes 2 along the lateral direction C respectively, it is not necessary to consider the air blowing direction D during mounting, thus improving the mounting efficiency and the water drainage performance of the fin 1.
adjacent straight segment 11 and substantially-circular arc segment 12 are connected via a substantially-circular arc transition segment 13, in which R> r, where, R is a radius of the substantially-circular arc segment (its centre of circle is O1) and r is a radius of the substantially-circular arc transition segment (its centre of circle is 02).
each end of one substantially-circular arc segment 12 is connected with an end of one substantially-circular arc transition segment 13, and the other end of the substantially-circular arc transition segment 13 is connected with an end of another straight segment 11, and then the other end of the another straight segment 11 is connected with another substantially-circular arc transition segment 13, thus forming a substantially corrugated fin 1 extending along the longitudinal direction B.
two straight segment 11, two substantially-circular arc segment 12 and four substantially-circular arc transition segment 13 form one cycle of the fin 1, and one cycle length of the fin 1 is P.
the fin 1 may be made, for example, by rolling metal foil. It may be understood by those skilled in the art that the cycle number of the fin 1 may be determined based on specific requirements, and is not particularly limited in the invention.
Areas A may be substantially rectangular or square after welding.
the compressed distance of the substantially-circular arc segment 12 is N (i. e. the chordal height of the substantially-circular arc segment 12).
the compressed distance N is controlled within 0.01-0.1 mm, i.e. 0.01 mm ⁇ R ( 1-cos( ⁇ /2) ) ⁇ 0.1 mm, in which R is the radius of the substantially-circular arc segment 12, and ⁇ is the central angle of the substantially-circular arc segment 12.
the central angle ⁇ of the substantially-circular arc segment 12 is set in a range of about 30° to about 170°.

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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)

EP10007986.2A 2009-08-13 2010-07-30 Lamelle und Wärmetauscher damit Active EP2295919B1 (de)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CN2009101623884A CN101619950B (zh)	2009-08-13	2009-08-13	翅片和具有该翅片的换热器

Publications (3)

Publication Number	Publication Date
EP2295919A2 true EP2295919A2 (de)	2011-03-16
EP2295919A3 EP2295919A3 (de)	2014-03-26
EP2295919B1 EP2295919B1 (de)	2015-06-17

Family

ID=41513301

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP10007986.2A Active EP2295919B1 (de)	2009-08-13	2010-07-30	Lamelle und Wärmetauscher damit

Country Status (3)

Country	Link
US (1)	US20110036550A1 (de)
EP (1)	EP2295919B1 (de)
CN (1)	CN101619950B (de)

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CN103913088B (zh) *	2014-04-16	2016-04-13	杭州三花微通道换热器有限公司	翅片和具有该翅片的折弯式换热器
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Also Published As

Publication number	Publication date
EP2295919B1 (de)	2015-06-17
CN101619950A (zh)	2010-01-06
US20110036550A1 (en)	2011-02-17
CN101619950B (zh)	2011-05-04
EP2295919A3 (de)	2014-03-26

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