EP3682181A1 - Insert hélicoïdal pour échangeur de chaleur à calandre - Google Patents

Insert hélicoïdal pour échangeur de chaleur à calandre

Info

Publication number
EP3682181A1
EP3682181A1 EP18779518.2A EP18779518A EP3682181A1 EP 3682181 A1 EP3682181 A1 EP 3682181A1 EP 18779518 A EP18779518 A EP 18779518A EP 3682181 A1 EP3682181 A1 EP 3682181A1
Authority
EP
European Patent Office
Prior art keywords
tube
heat exchanger
heat transfer
internal
length
Prior art date
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.)
Pending
Application number
EP18779518.2A
Other languages
German (de)
English (en)
Inventor
Hailing Wu
Abbas A. Alahyari
John H. Whiton
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP3682181A1 publication Critical patent/EP3682181A1/fr
Pending legal-status Critical Current

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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

Definitions

  • Exemplary embodiments pertain to the art of heating, ventilation, air conditioning and refrigeration (HVAC&R) systems. More specifically, the present disclosure relates to shell-and-tube heat exchangers for HVAC&R systems.
  • HVAC&R heating, ventilation, air conditioning and refrigeration
  • Shell and tube heat exchangers are utilized in HVAC&R systems, particularly as evaporators in HVAC&R systems, to facilitate a thermal energy exchange refrigerant in the evaporator and a medium, often water, a brine or other solution, flowing through a number of tubes in the evaporator.
  • the thermal energy exchange cools the medium and causes the refrigerant to boil.
  • a heat transfer tube includes a tube having an internal tube wall, and a tube element extending along a tube length and radially inwardly from the internal tube wall.
  • the tube element has a radial element height less than a hydraulic radius of the tube, and the radial element height is greater than a base element width at the internal tube wall.
  • the tube element extends helically along the tube length.
  • the tube element has a ratio of pitch to hydraulic diameter in the range of 1 to 20.
  • the tube element extends intermittently along the tube length.
  • the tube element includes a first element portion and a second element portion separate from the first element portion, the first element portion and second element portion overlapping along a lengthwise direction of the tube.
  • the tube element is configured to extend through a thermal boundary layer of a heat transfer medium flowing therethrough.
  • the tube element is a helical feature formed integral to the tube.
  • a single, unitary tube element extends radially inwardly from the internal tube wall at a cross-section perpendicular to the tube length.
  • the tube is formed from a first material, and the tube element is formed from a second material different from the first material.
  • the heat transfer tube includes one or more surface enhancements including one or more of axial, helical or crosshatched microfins or reentrant cavities.
  • a tube and shell heat exchanger in another embodiment, includes a housing and a heat exchanger tube extending through the housing and having a heat transfer medium flowing therethrough.
  • the heat exchanger tube includes a tube having an internal tube wall and tube element extending along a tube length and radially inwardly from the internal tube wall.
  • the tube element has a radial element height less than a hydraulic radius of the tube, and the radial element height is greater than a base element width at the internal tube wall.
  • the heat exchanger includes a refrigerant inlet to flow a refrigerant over the heat exchanger tube, for thermal energy exchange between the refrigerant and the heat transfer medium.
  • the tube element extends helically along the tube length.
  • the tube element has a ratio of pitch to hydraulic diameter in the range of 1 to 20.
  • the tube element extends intermittently along the tube length.
  • the tube element includes a first element portion and a second element portion separate from the first element portion, the first element portion and second element portion overlapping along a lengthwise direction of the tube.
  • the tube element is configured to extend through a thermal boundary layer of a heat transfer medium flowing therethrough.
  • the tube element is a helical feature formed integral to the tube.
  • a single, unitary tube element extends radially inwardly from the internal tube wall at a cross-section perpendicular to the tube length.
  • the tube is formed from a first material, and the tube element is formed from a second material different from the first material.
  • the heat exchanger tube includes one or more surface enhancements including one or more of axial, helical or crosshatched microfins or reentrant cavities.
  • FIG. 1 is a schematic view of a heating, ventilation, air conditioning and refrigeration (HVAC&R) system
  • FIG. 2 is a cross-sectional view of an embodiment of an evaporator for an HVAC&R system
  • FIG. 3 is a cross-sectional view of an embodiment of a tube for a heat exchanger
  • FIG. 4 is perspective view of an embodiment of a tube for a heat exchanger of an HVAC&R system
  • FIG. 5 is a cross-sectional view of another embodiment of a tube for a heat exchanger of an HVAC&R system.
  • FIG. 6 is a perspective view of yet another embodiment of a tube for a heat exchanger of an HVAC&R system.
  • a typical tube of a shell and tube heat exchanger may have features or "enhancements" to improve thermal energy transfer between the medium and the refrigerant.
  • One such enhancement is a twisted tape inset that extends entirely across an inner diameter of the tube. These inserts however typically result in a high pressure drop penalty along a length of the tube.
  • FIG. 1 Shown in FIG. 1 is a schematic view an embodiment of a heating, ventilation, air conditioning and refrigeration (HVAC&R) system 10, for example, a chiller.
  • HVAC&R heating, ventilation, air conditioning and refrigeration
  • a flow of vapor refrigerant 14 is directed into a compressor 16 and then to a condenser 18 that outputs a flow of liquid refrigerant 20 to an expansion valve 22.
  • the expansion valve 22 outputs a vapor and liquid refrigerant mixture 24 to an evaporator 12.
  • a thermal energy exchange occurs between a flow of heat transfer medium 28 flowing through a plurality of evaporator tubes 26 into and out of the evaporator 12 and the vapor and liquid refrigerant mixture 24.
  • the vapor refrigerant mixture 24 is boiled off in the evaporator 12, the vapor refrigerant 14 is directed to the compressor 16.
  • the evaporator 12 is a falling film evaporator. While a falling film evaporator 12 is shown in FIG. 2 and described herein, one skilled in the art will readily appreciate that the present disclosure may be readily applied to other shell-and-tube heat exchangers, such as a flooded evaporator or a condenser.
  • the evaporator 12 includes housing 52 with the evaporator 12 components disposed at least partially therein, including a separator 30 to separate liquid refrigerant 20 and vapor refrigerant 14 from the vapor and liquid refrigerant mixture 24. Vapor refrigerant 14 is routed from the separator 30 through a suction port 32 and toward the compressor 16, while the liquid refrigerant 20 is routed toward a distribution system 34 of the evaporator 12.
  • the distribution system 34 includes a distribution box 36 having a plurality of openings 38 arrayed along a bottom surface 44 of the distribution box 36. Though in the embodiment of FIG.
  • the distribution box 36 is substantially rectangular in cross-section, it is to be appreciated that the distribution box 36 may have another cross- sectional shape, for example, T-shaped or oval shaped.
  • the distribution box 36 and openings 38 are configured to drip liquid refrigerant 20 onto evaporator tubes 26 and resulting in the falling film terminating in a refrigerant pool 40 at a bottom of the evaporator 12.
  • a feed pipe 42 extends from the separator 30 into the distribution box 36 and terminates in the distribution box 36. Flow of the liquid refrigerant 20 into the distribution box 36 results in the collection of a volume of liquid refrigerant 20, or liquid head 46, in the distribution box 36 prior to flowing through the drip openings 38.
  • a vent 56 may be located at the distribution system 34, for example, at the distribution box 36 to allow escape of vapor refrigerant 14 that makes its way into the distribution system 34 from the separator 30 thereby preventing an unwanted buildup of vapor refrigerant 14 in the distribution system 34.
  • Heat transfer medium 28 flows through the evaporator tubes 26 for thermal energy exchange with the liquid refrigerant 20.
  • the tube 26 typically has a circular cross-section, with a central axis 60.
  • the evaporator tube 28 has internal or external enhancements including one or more of axial, helical or crosshatched microfins or reentrant cavities.
  • the heat transfer medium 28 is a single-phase liquid, and in some embodiments is a high Prandtl number fluid such as a low-temperature brine or glycol. In some embodiments, the fluid has a Prandtl number in the range of 7 to 200.
  • a thermal boundary layer 64 is a much thinner layer than a fluid momentum boundary layer. In other words, the fluid momentum boundary layer edge is located radially further inboard from a tube inner wall 62 than is the thermal boundary layer 64. Heat transfer is improved while minimizing the pressure drop increase by mixing the thermal boundary layer 64 with a core flow 66 located radially inboard of the thermal boundary layer 64, while minimizing the disturbance of the core flow 66.
  • a tube element such as a helical insert 68, is located inside the evaporator tube 26 and extends along a length of the evaporator tube 26.
  • the insert 68 is rectangular in cross-section, with an insert height 70 radially inboard from the tube inner wall 62 greater than a circumferential insert width 72.
  • an aspect ratio of insert height 70 to insert width 72 is in the range of 1 to 200.
  • the insert 68 may have a circular cross-section with an insert diameter 74.
  • the insert may have other cross-sectional shapes, such as oval or elliptical or other curvilinear shapes, or triangular or other polygonal shapes.
  • the insert height 70 is less than a tube hydraulic radius, and in some embodiments may be expressed as:
  • L tube length
  • Pr Prandtl number of the heat transfer medium 28;
  • ReD Reynolds number at the tube effective diameter
  • insert diameter 74 is substituted for insert height 70.
  • the insert height 70 is established to extend through the thermal boundary layer 64, while causing minimal disturbance to the core flow 66.
  • the helical insert 68 extends helically along the tube length and has an insert pitch 76, or a distance over the tube length at which the insert 68 traverses a full 360 degree rotation about the tube 26.
  • a narrower insert pitch 76 is selected, while to have a lesser effect on thermal energy transfer, a wider or longer insert pitch 76.
  • a ratio of insert pitch 76 to tube maximum internal diameter D is in the range of 1 to 20.
  • a single helical insert 68 is utilized, such that a single protrusion or insert height 70 is present at a cross-section taken perpendicular to the tube length. While a single helical insert 68 is shown in the present drawings and described herein, one skilled in the art will readily appreciate that a double- helical insert may be utilized in some embodiments. Further, one skilled in the art will readily appreciate that the present disclosure may be readily applied to evaporator tubes 26 having cross-sectional shapes other than circular, such as evaporator tubes 26 having oval, elliptical, rectangular or square cross-sections.
  • the helical insert 68 may extend intermittently along the tube length 76, and may be defined by a plurality of insert segments 80.
  • the insert segments 80 extend in a helical direction along the tube length, while in other embodiments the insert segments 80 each extend parallel to the tube length 76.
  • insert segments 80 may overlap along the tube length 76.
  • the helical insert 68 is secured to the tube inner wall 62, such intimate contact along an entire length of the helical insert 68 is not necessary, as the primary purpose of the helical insert 68 is to provide flow mixing of the heat transfer medium 28 to enhance heat transfer through the heat transfer medium 28.
  • the helical insert 68 may be formed from the same material as the evaporator tube 26, such as aluminum or copper or alloys thereof, and further may be formed integral with the evaporator tube 26. In other embodiments, the helical insert 68 is formed separately from the evaporator tube 26, and is installed via a secondary operation. Further, the helical insert 68 may be formed from a material different from the material utilized to form the evaporator tube 26, such as a metal or polymer material. [0045] The term "about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application.

Landscapes

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

Abstract

L'invention concerne un tube de transfert de chaleur comprenant un tube possédant une paroi de tube interne, et un élément de tube qui s'étend le long de la longueur du tube et radialement vers l'intérieur à partir de la paroi de tube interne. L'élément de tube présente une hauteur d'élément radial inférieure au rayon hydraulique du tube, et la hauteur de l'élément radial est supérieure à la largeur d'un élément de base au niveau de la paroi de tube interne. Un échangeur de chaleur à calandre comprend un tube d'échange de chaleur qui s'étend à travers un boîtier et dans lequel s'écoule un fluide de transfert de chaleur. Le tube d'échange de chaleur comprend un tube pourvu d'une paroi de tube interne et un élément de tube qui s'étend sur une longueur du tube et radialement vers l'intérieur à partir de la paroi de tube interne. L'élément de tube présente une hauteur d'élément radial inférieure au rayon hydraulique du tube, et la hauteur de l'élément radial est supérieure à la largeur d'un élément de base au niveau de la paroi de tube interne.
EP18779518.2A 2017-09-13 2018-09-11 Insert hélicoïdal pour échangeur de chaleur à calandre Pending EP3682181A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762557828P 2017-09-13 2017-09-13
PCT/US2018/050409 WO2019055390A1 (fr) 2017-09-13 2018-09-11 Insert hélicoïdal pour échangeur de chaleur à calandre

Publications (1)

Publication Number Publication Date
EP3682181A1 true EP3682181A1 (fr) 2020-07-22

Family

ID=63708472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18779518.2A Pending EP3682181A1 (fr) 2017-09-13 2018-09-11 Insert hélicoïdal pour échangeur de chaleur à calandre

Country Status (4)

Country Link
US (1) US20200271402A1 (fr)
EP (1) EP3682181A1 (fr)
CN (1) CN111065880A (fr)
WO (1) WO2019055390A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB890212A (en) * 1959-05-12 1962-02-28 Heat Pump & Refrigeration Ltd Improvements in or relating to refrigerating systems
US4466567A (en) * 1982-09-03 1984-08-21 The United States Of America As Represented By The United States Department Of Energy Method for braze-joining spirally wound tapes to inner walls of heat exchanger tubes
FR2611879B1 (fr) * 1987-02-23 1990-06-22 Chausson Usines Sa Echangeur de chaleur a faisceau tubulaire et a perturbateur interne
JP3001181B2 (ja) * 1994-07-11 2000-01-24 株式会社クボタ エチレン製造用反応管
JPH1123180A (ja) * 1997-06-30 1999-01-26 Ishikawajima Harima Heavy Ind Co Ltd 伝熱管の伝熱促進体
US6119769A (en) * 1998-08-05 2000-09-19 Visteon Global Technologies, Inc. Heat transfer device
US20070151713A1 (en) * 2005-12-31 2007-07-05 Lg Electronics Inc. Heat exchanger
US20110164465A1 (en) * 2010-01-06 2011-07-07 Robert Smith Heat exchanger with helical flow path
CN115046419A (zh) * 2014-09-12 2022-09-13 特灵国际有限公司 增强管内的湍流器
CN204787980U (zh) * 2015-04-30 2015-11-18 湖南众合节能环保有限公司 一种内插间隔螺旋带的换热管
CN105066764A (zh) * 2015-08-31 2015-11-18 浙江大学 内插螺旋翅片螺旋槽管强化换热管

Also Published As

Publication number Publication date
US20200271402A1 (en) 2020-08-27
CN111065880A (zh) 2020-04-24
WO2019055390A1 (fr) 2019-03-21

Similar Documents

Publication Publication Date Title
US4044797A (en) Heat transfer pipe
US3394736A (en) Internal finned tube
EP2392886A2 (fr) Tube de distributeur réfrigérant insensible à l'orientation
US20120160465A1 (en) Heat exchanger
US7546867B2 (en) Spirally wound, layered tube heat exchanger
CN108369043B (zh) 带水箱的热交换器
EP3021064B1 (fr) Dispositif de pompe à chaleur
JP2002206890A (ja) 熱交換器およびこれを用いた冷凍空調サイクル装置
WO2017073715A1 (fr) Tube perforé plat extrudé en aluminium et échangeur de chaleur
WO2014144105A1 (fr) Distributeur de réfrigérant monté latéralement dans un évaporateur noyé et tuyau d'entrée monté latéralement sur le distributeur
CN105823271B (zh) 热交换器
JP2005195192A (ja) 内面溝付伝熱管
AU2012200524B2 (en) Heat Exchanger
US20110226457A1 (en) Condensation enhancement heat transfer pipe
US20200271402A1 (en) Helical insert for shell and tube heat exchanger
US20200158446A1 (en) Internally enhanced heat exchanger tube
WO2021235463A1 (fr) Distributeur de fluide frigorigène, échangeur de chaleur, et climatiseur
US11236946B2 (en) Microchannel heat exchanger
CN111630329B (zh) 加热、通风、空调和制冷***、冷凝器及其设计方法
CN207095097U (zh) 一种盘卷式微通道换热器
JP5255249B2 (ja) 内面フィン付伝熱管
EP3390948B1 (fr) Tube de transfert de chaleur pour échangeur de chaleur
KR100704770B1 (ko) 열교환기
JP2000180083A (ja) 伝熱管

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200311

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20210127

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CARRIER CORPORATION