EP1762809A1 - Echangeur de chaleur comprenant un circuit de dioxyde de carbone supercritique - Google Patents

Echangeur de chaleur comprenant un circuit de dioxyde de carbone supercritique Download PDF

Info

Publication number
EP1762809A1
EP1762809A1 EP06300834A EP06300834A EP1762809A1 EP 1762809 A1 EP1762809 A1 EP 1762809A1 EP 06300834 A EP06300834 A EP 06300834A EP 06300834 A EP06300834 A EP 06300834A EP 1762809 A1 EP1762809 A1 EP 1762809A1
Authority
EP
European Patent Office
Prior art keywords
tube
irregularities
heat exchanger
channel
diameter
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.)
Withdrawn
Application number
EP06300834A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stéphane Colasson
Arnaud Bruch
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP1762809A1 publication Critical patent/EP1762809A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
    • 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
    • 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
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • 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
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0073—Gas coolers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/906—Reinforcement

Definitions

  • the invention relates to the field of heat exchangers or heat exchangers, and more specifically to heat exchangers operating with a high pressure carbon dioxide (CO 2 ) circuit.
  • CO 2 carbon dioxide
  • the invention relates more specifically to the structure of tubular channels used in such exchangers, with the aim of improving the heat exchange performance.
  • high-pressure fluids are widely used in multiple installations requiring heat exchanges between a fluid circuit and the external environment, or between two fluid circuits, whether they are cold production plants. or heating installations, both in the industrial and domestic sectors.
  • the fluid velocities at the walls can be relatively low, of the order of 0.1 to 0.3 m / s, resulting in a marked decrease in the coefficient of heat exchange, and therefore performance of the exchanger.
  • the increase of the heat exchange coefficient in the inlet part of the tube is a combined effect of the flow establishment, and the more pronounced evolution of the physical properties of supercritical carbon dioxide, due to gradients important thermal.
  • the object of the invention is to improve the heat exchange performance of exchangers using tubes in which circulate supercritical carbon dioxide.
  • the invention therefore relates to a heat exchanger comprising a supercritical carbon dioxide circuit.
  • this circuit comprises a plurality of channels at which heat exchange takes place.
  • At least a portion of these channels have irregularities of surfaces present on their internal faces.
  • surface irregularities or “microstructures” present on the internal face of the channels, is meant any deformation, hollow or in relief, with respect to the cylindrical profile of the channel, which cause the section of this same channel to vary along the length of the last.
  • these irregularities are located in an area extending from the inlet of the channel to a point at most at a distance of 400 times the diameter of the channel.
  • the invention consists in using channels of which only a part of the inner surface has microstructures which modify the laminar flow of the fluid by breaking the hydraulic and thermal layers. These irregularities are found in the first part of the channel, within a limit of 400 times the diameter of the tube.
  • the general principle of disrupting the laminar flow of a fluid should be considered as known in order to improve the heat exchange coefficient.
  • This principle is widely used in different types of tubular heat exchangers, but also in plate heat exchangers. It consists in causing the disturbances of the flow over the whole length of the exchange zone constituted by the tubular channel.
  • one of the main aspects of the invention is to use channels having irregularities, not over their entire length, but in localized areas, and more particularly in the input portion of the tube.
  • microstructures only in a specified area, allows a significant increase in heat transfer compared to a smooth tube, typically of the order of more than 10%.
  • the localized presence of the microstructures also results in a hydraulic advantage, insofar as the pressure drops in the channel are smaller, since part of the latter is free of reliefs.
  • the characteristic area of implantation of the irregularities is located downstream of a point located at 400 times the diameter of the channel, it being understood that the diameter taken into consideration is taken while ignoring the irregularities. In other words, it is the diameter of the regular cylinder of larger diameter registering inside the channel, ie coming into contact with the various irregularities. In other words, if zones between recesses are formed inside a channel, the diameter taken into consideration is that of the tube before making these recessed areas.
  • the diameter taken into consideration is the diameter of the tube without irregularity, before making them.
  • the channels may preferentially have a generally cylindrical shape, with a disc-shaped section.
  • the diameter considered for determining the zone of presence of the microstructures is the hydraulic diameter, conventionally defined as the ratio of four times the section of the channel, divided by the wet perimeter, that is to say the length of the perimeter of the considered section.
  • the irregularities are present in an area extending between the points located respectively at 80 times the diameter and 200 times the diameter of the channel, measured distances from the entrance of the latter. Irregularities may occupy all or part of this area, without necessarily reaching the indicated limits.
  • this preferential zone means that almost all the irregularities which have a significant influence on the heat exchange coefficient are located in this characteristic zone, without excluding, however, that a much more limited number, thus having a less effect, is present along the tube outside this characteristic zone.
  • the distribution of irregularities along the characteristic zone may be uniform or even variable along it, in order to optimize the overall exchange coefficient.
  • the irregularities can be realized in different forms and by multiple processes.
  • these irregularities can be achieved by micro-fins, advantageously oriented and radially along the tube.
  • profiles of these fins or recesses can be chosen according to the conditions of pressure, temperature and the desired performances for the heat exchanger, for example to not weaken the channel. These various irregularities can be achieved in various ways and in particular by machining, milling, extrusion or insertion. Of course, the invention can be applied to exchangers made of different materials such as stainless steel, aluminum or even copper.
  • a heat exchanger operating with supercritical CO 2 has a plurality of tubes as shown in FIG.
  • such a tube has on its inner surface 2 microstructures which form reliefs hollow or hump.
  • these irregularities are in the form of grooves 3, circumferentially hollow, and evenly distributed along the length of the tube region where these irregularities are present.
  • these irregularities are present in an area 6 which extends over only a portion of the length of the tube 1.
  • this diameter D corresponds to the nominal diameter of the tube, without taking into account the recessed areas 3.
  • FIG. 3 illustrates the gains in terms of the exchange coefficient obtained through the use of tube according to the invention.
  • the curve in solid line illustrates the same variation of the heat exchange coefficient, for a tube according to the invention.
  • the heat exchange coefficient is slightly lower than that of an equivalent smooth tube.
  • a tube according to the invention was made based on a stainless steel, with an internal diameter D of 0.5 mm and a length L of 334 mm.
  • the CO 2 temperature in the tube inlet is 393 K, for a tube wall temperature of 298 K.
  • microstructures are present on a zone of extension between 80.D, that is 40 mm and 220.D, ie 110 mm. These microstructures are rectangular in shape, 0.05 mm high and 0.05 mm wide, at a pitch of 3.75 mm.
  • the average exchange coefficient calculated over the overall length of this tube is 853 W / m 2 / K.
  • This coefficient is calculated by means of a numerical computation code for fluid flow, such as in particular the FLUENT CFD software (Calculations of Fluid Dynamics) distributed by Fluent France.
  • This value is to be compared with the average exchange coefficient calculated for a smooth tube, therefore free of any microstructure, and of the same diameter.
  • the average coefficient in this case is 739 W / m 2 / K, which corresponds to an increase of 15.3%, thanks to the presence of the microstructure characteristic zone.
  • the heat exchanger according to the invention has multiple advantages, in particular that of improving the heat exchange coefficient, and therefore the overall performance of the exchanger. These performances therefore make it possible to ensure an improved compactness of the exchanger, with equal thermal performances.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP06300834A 2005-09-07 2006-07-28 Echangeur de chaleur comprenant un circuit de dioxyde de carbone supercritique Withdrawn EP1762809A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0552702A FR2890435B1 (fr) 2005-09-07 2005-09-07 Echangeur de chaleur comprenant un circuit de dioxyde de carbonne supercritique

Publications (1)

Publication Number Publication Date
EP1762809A1 true EP1762809A1 (fr) 2007-03-14

Family

ID=36570368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06300834A Withdrawn EP1762809A1 (fr) 2005-09-07 2006-07-28 Echangeur de chaleur comprenant un circuit de dioxyde de carbone supercritique

Country Status (5)

Country Link
US (1) US7267161B2 (ja)
EP (1) EP1762809A1 (ja)
JP (1) JP2007085723A (ja)
CN (1) CN100575859C (ja)
FR (1) FR2890435B1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174489A1 (fr) 2013-04-26 2014-10-30 Commissariat A L'energie Atomique Et Aux Energies Alternatives Four a chauffage par induction electromagnetique, utilisation du four pour la fusion d'un melange de metal(ux) et d'oxyde(s) representatif d'un corium

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008268108A (ja) * 2007-04-24 2008-11-06 Ihi Corp 熱処理シミュレーション方法
JP5171280B2 (ja) * 2008-01-18 2013-03-27 日立アプライアンス株式会社 熱交換器及びそれを用いたヒートポンプ式給湯機
CN102759294B (zh) * 2011-04-29 2014-07-16 中国石油化工股份有限公司 一种带有旋流片的强化传热管
JP2012247180A (ja) * 2012-08-10 2012-12-13 Hitachi Appliances Inc 熱交換器
US11692479B2 (en) 2019-10-03 2023-07-04 General Electric Company Heat exchanger with active buffer layer
CN110849200B (zh) * 2019-11-29 2022-03-15 四川大学 超临界c02管路式换热器的导流结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885622A (en) * 1971-12-30 1975-05-27 Olin Corp Heat exchanger tube
JP2001221580A (ja) * 2000-02-08 2001-08-17 Sanden Corp 熱交換器
EP1389721A1 (en) * 2001-05-23 2004-02-18 Matsushita Electric Industrial Co., Ltd. Refrigerating cycle device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252033A (fr) * 1959-04-28 1961-01-27 Tubes d'échangeur de chaleur à surface rugueuse
US3217799A (en) * 1962-03-26 1965-11-16 Calumet & Hecla Steam condenser of the water tube type
US3244601A (en) * 1962-12-04 1966-04-05 Gen Electric Fluted tubular distillation apparatus
US3902552A (en) * 1973-05-10 1975-09-02 Olin Corp Patterned tubing
US4258783A (en) * 1977-11-01 1981-03-31 Borg-Warner Corporation Boiling heat transfer surface, method of preparing same and method of boiling
JPS5984093A (ja) * 1982-11-02 1984-05-15 Toshiba Corp 伝熱管およびその製造方法
US5070937A (en) * 1991-02-21 1991-12-10 American Standard Inc. Internally enhanced heat transfer tube
US6644388B1 (en) * 2000-10-27 2003-11-11 Alcoa Inc. Micro-textured heat transfer surfaces
US20020096314A1 (en) * 2001-01-25 2002-07-25 Carrier Corporation High performance micro-rib tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885622A (en) * 1971-12-30 1975-05-27 Olin Corp Heat exchanger tube
JP2001221580A (ja) * 2000-02-08 2001-08-17 Sanden Corp 熱交換器
EP1389721A1 (en) * 2001-05-23 2004-02-18 Matsushita Electric Industrial Co., Ltd. Refrigerating cycle device

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
BRUCH, A. BONTEMPS; J. F. FOURMIGUÉ; S. COLASSON: "Simulation numérique du comportement thermohydraulique d'un écoulement de CO2 supercritique dans un tube vertical", CONGRÈS ANNUEL DE LA SFT, 2005
BRUCH, A. BONTEMPS; S. COLASSON; J. F. FOURMIGUÉ: "Numerical investigation of laminar convective heat transfer of carbon dioxide flowing in vertical mini tubes in cooling conditions", INTERNATIONAL CONFERENCE ON HEAT TRANSFER IN COMPONENTS AND SYSTEMS FOR SUSTAINABLE ENERGY TECHNOLOGIES, 2005
BRUCH, S. COLASSON; A. BONTEMPS; J. F. FOURMIGUÉ: "Approach to supercritical carbon flow in a vertical tube - Comparison of upward and downward flows", 6ÈME CONFÉRENCE INTERNATIONALE GUSTAV LORENTZEN SUR LES FLUIDES NATURELS, 2004
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 25 12 April 2001 (2001-04-12) *
ZILLY J ET AL: "CONDENSATION OF CO2 AT LOW TEMPERATURES IN MICRO-FINNED HORIZONTAL TUBES", INTERNATIONAL CONGRESS OF REFRIGERATION. PROCEEDINGS - CONGRES INTERNATIONAL DU FROID. COMPTES RENDUS, 17 August 2003 (2003-08-17), pages 1 - 8, XP000962261 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174489A1 (fr) 2013-04-26 2014-10-30 Commissariat A L'energie Atomique Et Aux Energies Alternatives Four a chauffage par induction electromagnetique, utilisation du four pour la fusion d'un melange de metal(ux) et d'oxyde(s) representatif d'un corium
US10231290B2 (en) 2013-04-26 2019-03-12 Commissariat à l'Energie Atomique et aux Energies Alternatives Electromagnetic induction furnace and use of the furnace for melting a mixture of metal(s) and oxide(s), said mixture representing a corium

Also Published As

Publication number Publication date
CN1940458A (zh) 2007-04-04
JP2007085723A (ja) 2007-04-05
US7267161B2 (en) 2007-09-11
FR2890435A1 (fr) 2007-03-09
US20070051505A1 (en) 2007-03-08
CN100575859C (zh) 2009-12-30
FR2890435B1 (fr) 2007-09-28

Similar Documents

Publication Publication Date Title
EP1762809A1 (fr) Echangeur de chaleur comprenant un circuit de dioxyde de carbone supercritique
JP2010510957A5 (ja)
FR2527838A1 (fr) Dispositif et procede de transfert thermique entre solides, avec assistance par un gaz, pour une tranche de semi-conducteur
EP0625688A1 (fr) Echangeur de chaleur à plaques
FR2706197A1 (fr) Tubes rainurés pour échangeurs thermiques d'appareils de conditionnement d'air et de réfrigération, et échangeurs correspondants.
FR2940422A1 (fr) Echangeur de chaleur comprenant des tubes a ailettes rainurees
FR3016027A1 (fr) Echangeur thermique comprenant une grille
FR3064346A1 (fr) Echangeur de chaleur avec dispositif melangeur liquide/gaz a portion de canal regulatrice
FR2928449A1 (fr) Dispositif d'echange de chaleur et procede de fabrication d'un element d'echange de chaleur pour un dispositif d'echange de chaleur
WO2012062720A1 (fr) Dispositif de refroidissement pour fibre optique ameliore
FR2855601A1 (fr) Tubes rainures pour echangeurs thermiques a fluide monophasique, typiquement aqueux
FR2684437A1 (fr) Echangeur de chaleur, notamment pour reacteurs hypersoniques, comportant un entretoisement pour les tubes de sa matrice.
EP3132222B1 (fr) Module d'echangeur de chaleur a echange thermique, utilisation avec du metal liquide et du gaz
EP0117829A1 (fr) Echangeur de chaleur à tuyaux
BE1023609B1 (fr) Nez de lance de soufflage
FR3099564A1 (fr) Module d’échangeur de chaleur à deux circuits de fluides, notamment échangeur de chaleur de réacteur nucléaire
FR3060721B1 (fr) Echangeur de chaleur avec dispositif melangeur liquide/gaz a geometrie de canal amelioree
EP0231311A1 (fr) Procede de fabrication par coulee d'une piece metallique munie interieurement d'une partie evidee entouree par un tube
FR3075337A1 (fr) Element intercalaire a texturation de surface, echangeur de chaleur comprenant un tel element
BE1023685B1 (fr) Nez de lance de soufflage
EP0517638A1 (fr) Tuyère modulaire à refroidissement par film d'eau notamment pour essais à haute température d'éprouvettes ou analogues
WO2001073366A1 (fr) Echangeur de chaleur a plaques
BE1023582B1 (fr) Nez de lance de soufflage
EP1743094A1 (fr) Conduit de refroidissement moteur
FR3130359A1 (fr) Dispositif d’échange thermique comprenant au moins un dispositif limiteur de débit, système de conditionnement d’air et véhicule

Legal Events

Date Code Title Description
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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20070323

17Q First examination report despatched

Effective date: 20070425

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: F28F 13/18 20060101AFI20091208BHEP

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100511