WO2004076954A1 - Conduit renforce d'echangeur thermique avec des tronçons arrondis et elliptiques alternes - Google Patents

Conduit renforce d'echangeur thermique avec des tronçons arrondis et elliptiques alternes Download PDF

Info

Publication number
WO2004076954A1
WO2004076954A1 PCT/CN2003/000490 CN0300490W WO2004076954A1 WO 2004076954 A1 WO2004076954 A1 WO 2004076954A1 CN 0300490 W CN0300490 W CN 0300490W WO 2004076954 A1 WO2004076954 A1 WO 2004076954A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
elliptical
cross
section
circular
Prior art date
Application number
PCT/CN2003/000490
Other languages
English (en)
Chinese (zh)
Inventor
Zengyuan Guo
Jian Meng
Weilin Hu
Zhixin Li
Original Assignee
Tsinghua University
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.)
Filing date
Publication date
Application filed by Tsinghua University filed Critical Tsinghua University
Priority to AU2003303973A priority Critical patent/AU2003303973A1/en
Publication of WO2004076954A1 publication Critical patent/WO2004076954A1/fr

Links

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
    • F28F1/006—Tubular elements; Assemblies of tubular elements with variable shape, e.g. with modified tube ends, with different geometrical features

Definitions

  • the invention relates to an enhanced heat transfer element used in the field of heat transfer enhancement and heat exchangers, in particular to a circular-elliptical cross-section cross-scaling enhanced heat exchange tube.
  • Heat transfer enhancement technology has been widely used in engineering due to its ability to increase heat transfer rate and save energy. It can generally be divided into active and passive reinforcement technologies.
  • the former refers to heat transfer enhancement technology that requires energy input from the outside, such as electric field strengthening, magnetic field strengthening, vibration strengthening technology, etc .; the latter refers to heat transfer enhancement technology that does not require external energy, so it is easier to be used in engineering.
  • Passive reinforcement techniques usually include extended surfaces (fins), in-tube inserts, swirling (turbulent) generators, etc.
  • the above heat transfer enhancement techniques are described in detail in the book "Enhanced Heat Transfer” (Science Press 1990) by Gu Weizao, Shen Jiarui, Ma Chongfang, and Zhang Yuming.
  • the Chinese invention patent (application number 00136122.8, publication number CN1361406A) with the invention name of "cross-ellipsoidal cross-section heat exchange tube” proposes a new type of heat exchange tube.
  • This heat exchange tube is composed of several oval tube segments, and adjacent elliptical tube segments The major axes of the ellipse intersect at a certain angle (typically 60 degrees or 90 degrees).
  • This design conforms well to the "field cooperation principle", so it has a relatively large heat transfer enhancement effect and a small increase in flow resistance.
  • the patented technology still has obvious shortcomings, mainly: 1. The flow resistance can be smaller; 2. The poor pressure resistance of the oval tube restricts its application under high pressure conditions; 3. When this kind of heat transfer is used When the tube is used to manufacture a heat exchanger, the design of the baffle plate or the baffle rod in the heat exchanger is a bit cumbersome due to the orientation of the oval tube section. Summary of the Invention
  • the purpose of the present invention is to propose a circular-elliptical cross-section cross-scaling enhanced heat transfer tube based on the "field synergy principle" and the shortcomings of the above-mentioned invention patents.
  • the same pump (fan) function Consumption has better heat transfer performance;
  • cross-ellipsoidal cross-section heat transfer tube with the same heat transfer capacity, it has less flow resistance, higher pressure resistance, and can eliminate design and manufacturing Trouble with baffles and baffles.
  • a circular-elliptical cross-section cross-strengthening and strengthening heat-exchanging tube is composed of a plurality of circular tube segments, an elliptical tube segment and a circular-elliptical transition segment, and the circular tube segment and the The pipe segments are arranged periodically in sequence, and the ellipse long axes of adjacent elliptical pipe segments intersect at an angle of 15 to 90 degrees.
  • each circular pipe section may be of equal or unequal length; each elliptical pipe section may be of equal or unequal length, and each circle-ellipse transition section may be of equal or unequal length.
  • the ratio of the length of the inner diameter of its respective cylindrical section is 0.5 ⁇ 10; ratio of length to inner diameter of each segment of the circular pipe section is oval tube 1 ⁇ 10; ratio of major and minor axes of the ellipse of the tube outer diameter is 1.1 ⁇ 2.5, preferably 1.3 ⁇ 1.7.
  • the technical feature of the present invention is also that the inner surface or the outer surface or the inner and outer surfaces of the heat exchange tube may be a smooth surface, or a low-rib surface or a threaded surface.
  • the invention has the following advantages and outstanding progress: 1
  • the obtained large-scale secondary flow (eddy current) is not generated by external inserts, but is caused by the change in cross-sectional shape of the pipe along the way, so the flow resistance is small; 2
  • the obtained The secondary flow is a longitudinal vortex (the direction of the vortex is parallel to the flow direction).
  • the velocity field and the temperature gradient field have a better degree of synergy. Slow decay, so it can have better heat transfer enhancement performance.
  • the present invention Compared with other reinforced heat exchange tubes, the present invention has better heat transfer performance under the same power consumption of the pump (fan); compared with "cross-ellipsoidal cross section heat transfer tubes", it has the same heat transfer capacity
  • the flow resistance is smaller, the flow resistance is reduced by more than 10%; the pressure resistance is higher, the internal stress of the pipe wall is smaller, and the pressure bearing capacity is increased by 30%; and it eliminates the problems encountered in the design and manufacture of baffles and baffles Trouble, design, processing, and assembly are more convenient.
  • the invention has a wide range of applications, and can be used for both single-phase fluid heat transfer enhancement and phase boiling heat transfer enhancement such as flow boiling and flow condensation. It can be used for both in-pipe heat transfer enhancement and outer-pipe heat transfer enhancement.
  • FIG. 1 is a schematic structural diagram of a circular-elliptical cross-section cross-scaling enhanced heat exchange tube according to the present invention.
  • FIG. 2 is an E-E view of FIG. 1.
  • Figure 3 shows the flow structure in the elliptical tube segment. The near-wall region presents eight longitudinal vortices. DETAILED DESCRIPTION The specific structure of the present invention will be described in detail below with reference to the drawings.
  • FIG. 1 is a schematic structural diagram of a circular-elliptical cross-section cross-scaling enhanced heat exchange tube according to the present invention.
  • the enhanced heat exchange tube is composed of a plurality of circular tube sections 1, an elliptical tube section 2, a circular-elliptical transition section 3, and inlet circular tube sections 4 at both ends.
  • the length of each round pipe section can be equal or different.
  • the length Lo of the round pipe sections at both ends can be 2 to 4 times the thickness of the tube sheet, which depends on the needs of the assembly with the tube sheet, and a small value on the premise that the assembly needs are met.
  • the length of each ellipse segment can be the same or different.
  • the cross-sectional shape of the elliptical tube section is a standard oval or an approximately ellipse or an oblate or multi-segment arc fitted with two straight lines and two arcs.
  • There is an included angle C between the long axes of the ellipse (oblate circle) of two adjacent elliptical pipe sections (see Figure 2, E-E view), take the angle of C 15 ⁇ 90 degrees, preferably C is equal to 60 degrees and 90 degrees
  • Two kinds; if the heat exchanger tube in the heat exchanger is pressed according to four For a rectangular arrangement, take C 90 degrees. If the heat exchanger tubes are arranged in a triangle, take O60 degrees.
  • the length Lt of the circle-ellipse transition section is Le / 2 ⁇ Lt ⁇ 0.1d, and a small value is recommended. The length of each transition section may be the same or different.
  • the inner surface, the outer surface, or the inner and outer surfaces of the "circular-elliptical cross-section cross-strengthening and strengthening heat-exchanging tube" of the present invention may be both smooth surfaces (e.g., rolling or molding with ordinary round tubes or rolling seamless tubes once Forming), it can also be a low-rib surface or a threaded surface (such as a low-rib tube or a threaded tube), forming a periodic circle-vertical ellipse-circle-transverse ellipse-circle ... structure (see Figure 1, Figure 2 ).
  • the low-ribbed and threaded "circular-elliptical cross-section scaled heat-exchanging tubes” have both a field-coordinated enhanced heat transfer function and an extended surface-enhanced heat transfer function. The effect of enhanced heat transfer is better, but the flow resistance increases accordingly. Large, and strict requirements on the cleanliness of the working fluid. These two types of “circular-elliptical cross-section cross-strengthening and strengthening heat exchange tubes” are more suitable for occasions where the working fluid does not contain fibers and particles, and has a large viscosity and a small flow velocity.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention a trait à un conduit renforcé d'échangeur thermique avec des tronçons arrondis et elliptiques alternés, constitué de plusieurs tronçons arrondis, de conduite, de tronçons elliptiques de conduit et des tronçons de transition arrondis elliptiques. Les conduits arrondis et les conduits elliptiques sont disposés en alternance et forment un angle entre 15 et 90° entre l'axe longitudinal et l'axe perpendiculaire de l'ellipse adjacent. La présente invention présente des propriétés de plus faible résistance à la circulation et de bon transfert thermique. L'invention a diverses utilisations et peut inhiber l'accumulation d'impuretés. Pour l'échangeur thermique à calandre de l'invention, la vibration du faisceau de conduits est nettement plus faible que le faisceau de conduits arrondis classiques, et par conséquent la durée de vie de l'échangeur thermique est accrue.
PCT/CN2003/000490 2003-02-28 2003-06-25 Conduit renforce d'echangeur thermique avec des tronçons arrondis et elliptiques alternes WO2004076954A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003303973A AU2003303973A1 (en) 2003-02-28 2003-06-25 Reinforced heat exchange pipe with sections of round and ellipse of alternate change

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN03104763.7 2003-02-28
CNB031047637A CN1190645C (zh) 2003-02-28 2003-02-28 圆－椭圆截面交叉缩放强化换热管

Publications (1)

Publication Number Publication Date
WO2004076954A1 true WO2004076954A1 (fr) 2004-09-10

Family

ID=28050225

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2003/000490 WO2004076954A1 (fr) 2003-02-28 2003-06-25 Conduit renforce d'echangeur thermique avec des tronçons arrondis et elliptiques alternes

Country Status (3)

Country Link
CN (1) CN1190645C (fr)
AU (1) AU2003303973A1 (fr)
WO (1) WO2004076954A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102297627A (zh) * 2011-06-08 2011-12-28 上海科米钢管有限公司 应用椭圆形螺旋换热管的热交换设备
CN105066760A (zh) * 2015-08-04 2015-11-18 王丙康 一种用于热水器换热器的冷凝管
US20180313548A1 (en) * 2017-04-28 2018-11-01 Trane International Inc. Flue Vent Adapter for Multi-Poise Furnace

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2991813C (fr) * 2015-07-10 2023-09-26 Michael Fuller Echangeur de chaleur
CN105465867A (zh) * 2015-11-25 2016-04-06 重庆市龙山金属材料有限公司 一种热交换增强地暖
CN105387751A (zh) * 2015-11-25 2016-03-09 重庆祥吉机械制造有限公司 一种新型热交换增强热水器
CN105387747A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种交叉椭圆截面及圆面热交换增强管
CN105387746A (zh) * 2015-11-25 2016-03-09 重庆祥吉机械制造有限公司 一种热交换增强热水器
CN105387750A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种热交换增强管
CN105387749A (zh) * 2015-11-25 2016-03-09 重庆祥吉机械制造有限公司 一种新型热交换增强地暖
CN105387755A (zh) * 2015-11-25 2016-03-09 重庆祥吉机械制造有限公司 一种热交换增强散热器
CN105387508A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种改良热交换增强地暖
CN105387748A (zh) * 2015-11-25 2016-03-09 重庆祥吉机械制造有限公司 一种新型热交换增强管
CN105387757A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种改良热交换增强管
CN105387753A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种改良热交换增强散热器
CN105387756A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种改良热交换增强空调
CN105387745A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种改良热交换增强热水器
CN105387760A (zh) * 2015-11-25 2016-03-09 重庆市龙山金属材料有限公司 一种热交换增强空调
CN105466247B (zh) * 2015-11-26 2017-05-17 张家港市大新毛纺有限公司 印染生产用废水再利用设备
CN112179185B (zh) * 2020-09-29 2021-11-19 清华大学 一种复合强化传热的双通道换热单元及其换热器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2089367U (zh) * 1991-04-08 1991-11-27 湖南省化肥工业公司 直形异径冷管束
CN2335113Y (zh) * 1997-07-18 1999-08-25 孟继安 螺旋扭曲椭形截面换热管
CN1361406A (zh) * 2000-12-26 2002-07-31 孟继安 交叉椭形截面换热管

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2089367U (zh) * 1991-04-08 1991-11-27 湖南省化肥工业公司 直形异径冷管束
CN2335113Y (zh) * 1997-07-18 1999-08-25 孟继安 螺旋扭曲椭形截面换热管
CN1361406A (zh) * 2000-12-26 2002-07-31 孟继安 交叉椭形截面换热管

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102297627A (zh) * 2011-06-08 2011-12-28 上海科米钢管有限公司 应用椭圆形螺旋换热管的热交换设备
CN105066760A (zh) * 2015-08-04 2015-11-18 王丙康 一种用于热水器换热器的冷凝管
US20180313548A1 (en) * 2017-04-28 2018-11-01 Trane International Inc. Flue Vent Adapter for Multi-Poise Furnace
US10746414B2 (en) * 2017-04-28 2020-08-18 Trane International Inc. Flue vent adapter for multi-poise furnace

Also Published As

Publication number Publication date
AU2003303973A1 (en) 2004-09-17
CN1447088A (zh) 2003-10-08
CN1190645C (zh) 2005-02-23

Similar Documents

Publication Publication Date Title
WO2004076954A1 (fr) Conduit renforce d'echangeur thermique avec des tronçons arrondis et elliptiques alternes
WO2017101235A1 (fr) Échangeur de chaleur à tubes en spirale à haut rendement amélioré
CN109405589B (zh) 一种双管程独立换热的球形换热器
WO2004099698A1 (fr) Tube d'echange thermique intensif avec nervures discontinues
CN102767975A (zh) 一种整体热浸锌防腐的扭曲管自支撑管壳式换热器
WO2011063624A1 (fr) Échangeur de chaleur à calandre, et plaque chicane de cet échangeur
CN102278907B (zh) 外凸式非对称型波节管换热器
CN1190646C (zh) 菱形强化换热管
TW568999B (en) Enhanced heat-exchanging tubes with alternating elliptical and circular cross sections
CN1455220A (zh) 管段和/或管段截面呈异型/形的强化换热管
CN105276865A (zh) 同轴螺纹管内插芯体式换热器
CN201867119U (zh) 一种螺旋折流板换热器
CN105258533A (zh) 具有分形结构的管壳式换热器
CN114526618A (zh) 一种多股流内套螺旋扭曲扁管绕管式换热器
CN202182658U (zh) 一种适于整体热浸锌防腐的自支撑管壳式换热器
CN207797825U (zh) 扭曲椭圆管螺旋折流板换热器
CN212390893U (zh) 一种换热器翅片管
CN100334415C (zh) 旋流网板支承管束的管壳式换热器及其强化传热方法
CN211234047U (zh) 一种全旋流管壳式换热器
CN112212724A (zh) 一种带旋流折流板的换热器
CN113218218A (zh) 一种铜铝复合材料内外翅片管换热器
CN112762753A (zh) 基于内螺纹和正反内翅片耦合结构的多段式强化换热管
CN2739555Y (zh) 旋流网板支承管束的管壳式换热器
CN205300369U (zh) 一种能够对套管换热器进行传热强化的多平面旋流片
CN110849184A (zh) 一种全旋流管壳式换热器

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP