WO2020074607A1 - Mpe en bande à capacité de drainage améliorée - Google Patents

Mpe en bande à capacité de drainage améliorée Download PDF

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Publication number
WO2020074607A1
WO2020074607A1 PCT/EP2019/077404 EP2019077404W WO2020074607A1 WO 2020074607 A1 WO2020074607 A1 WO 2020074607A1 EP 2019077404 W EP2019077404 W EP 2019077404W WO 2020074607 A1 WO2020074607 A1 WO 2020074607A1
Authority
WO
WIPO (PCT)
Prior art keywords
mpe
web
tubes
fins
drain
Prior art date
Application number
PCT/EP2019/077404
Other languages
English (en)
Inventor
Bjørn VESTERGAARD
Original Assignee
Hydro Extruded Solutions As
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 Hydro Extruded Solutions As filed Critical Hydro Extruded Solutions As
Publication of WO2020074607A1 publication Critical patent/WO2020074607A1/fr

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Classifications

    • 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
    • F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • 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
    • F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05333—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28D3/00—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 flows in a continuous film, or trickles freely, over the conduits
    • F28D3/02—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 flows in a continuous film, or trickles freely, over the conduits with tubular conduits
    • 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
    • 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
    • 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
    • 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
    • F28F1/14—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 longitudinally
    • F28F1/16—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 longitudinally the means being integral with the element, e.g. formed by extrusion
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the present invention relates to a Multi Port Extrusion (MPE), for use in exchangers for heat exchange or heat recovery in solutions such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems.
  • MPE Multi Port Extrusion
  • the present invention concerns a new design of Multi Port Extrusions, so-called MPE, used in exchangers for heat exchange or heat recovery in solutions such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems.
  • MPE Multi Port Extrusions
  • Micro channel type heat exchangers based on multiport extruded profiles of aluminium are known where fins, also of aluminium, are provided between the extruded multiport tubes.
  • Heat exchangers of such type are for instance known from WO2014133394.
  • the global demand (regulated by HFC-gas regulation) to reduce C0 2 emissions points at low GWP (global warming potentials) refrigerants and systems with reduced refrigerant per kW cooling/ heating.
  • the low GWP refrigerants are flammable/toxic/very high pressure and alternative solutions are strived at.
  • the use of MPEs reduces the amount of refrigerant per kW and is thereby a suitable alternative.
  • a problem with conventional MPEs, in particular when used in evaporators/heat pumps, is to effectively drain away any condensed water/ melted ice from the heat exchanger. Unless properly drained the heat transfer capacity of the heat exchanger is greatly reduced.
  • the early Web-MPEs using centered webs were designed for horizontally oriented tubes placed between fins with openings cut for water drainage, a design that is complicated and expensive to make.
  • the Web-MPE With the Web-MPE according to present invention it is possible to provide effective drainage of any condensed water or melted ice. This is done by controlling the web width between the tubes and the location of the web in relation to the tube outer surfaces and removing as much as needed of the web material in order to have the water drain by gravity.
  • the present invention relates to a Multi Port Extrusion (MPE) tubing for use in heat exchangers, comprising multiple individual transport tubes for fluids being separated by webs, each tube having a height (h), and each web having a width (w).
  • MPE Multi Port Extrusion
  • the webs are arranged to be located in a plane common with one of the outer surfaces of the tubes so that drain channels are formed between adjacent tubes, each having a drain channel cross sectional area formed between two adjacent tubes and an inner surface of the web located between the two adjacent tubes, the MPE tubing having a drain channel space defined as the volume between two tubes and the web inner surface.
  • the drain channel cross sectional area (a) is preferably from 2,5 mm 2 - 30 mm 2 , more preferably between 3,25 and 6,25 mm 2 .
  • the depth of the drain channel is preferably at least 2 mm, more preferably at least 3 mm.
  • the web width (w) is preferably 2-15 mm, more preferably 2-10 mm, more preferably 3-5 mm.
  • the webs have openings for passage of water, the openings made in the web are preferably at least half of the web length, more preferably at least 3 ⁇ 4 of the web length.
  • the web opening has a width corresponding to the distance between two adjacent tubes.
  • each individual tube is typically separated by webs, so that is has webs on both sides.
  • the present invention also relates to a heat exchanger comprising the MPE described above, wherein the MPE is surrounded by fins undulated in the tube fluid transport direction in multiple alternating layers and where the fins are attached to the MPEs at their crests, and the drain cannel cross sectional area is from 2,5 mm 2 - 30 mm 2 , preferably between 3,25 and 6,25 mm 2 .
  • the fins are preferably attached to the MPEs by brazing or gluing.
  • the undulating fins can preferably be made from continuous strip without openings/cuts.
  • the heat exchanger is advantageously an evaporator.
  • Figure 2a shows schematically a web-MPE according to the present invention
  • Figure 2b shows schematically a vertically arranged web-MPE according to the invention with parts of the web removed to form a specific pattern
  • Figure 2c shows schematically the web-MPE in figure 2b seen in a 2-dimensional view
  • Figure 2d shows schematically a vertically arranged web-MPE with attached fins according to the invention
  • FIGS 2e-2f schematically illustrate web-MPEs having different cross-sectional area of the tubes
  • FIG. 3 schematically illustrates a heat exchanger comprising the Web-MPE according to the invention, e g an evaporator/outdoor heat pump coil
  • Today's Web-MPE extrusion has the webs placed symmetrically in the height direction of the individual tubes between every two tubes to keep the distance between the tubes, which makes the drainage openings too small to drain by gravity.
  • the web blocks the drainage opening due to capillary forces and does not provide enough passage for the condensate water to drain by gravity when the MPEs are vertically oriented.
  • the present invention makes the drainage openings much bigger by locating the webs to one of the tube surfaces, so that the webs are arranged to be located in a plane common with one of the outer surfaces of the tubes.
  • the invention allows the use of vertical Web-MPE's.
  • the invention furthermore allows the use of serpentine fins formed from rolled sheet (used in conventional MicroChannel Heat Exchangers) without making drainage openings therein.
  • Figure la shows a web-MPE (A) as known in the art, comprising tubes joined by a thin webs (B), where the webs are located at the center of the tubes.
  • FIG. lb showing a cross section through the Web-MPE in figure la at the location Al-Al in Fig. la.
  • Fins (C) shown partially in the figure, are surrounding the vertically oriented MPE (A) and are attached to the Web-MPE extrusions at their crests.
  • the webs (B) are partially removed so that only a small section (Bl) remains in the middle of the tube width, i.e. in the central part of the MPE.
  • a heat exchanger of this type is normally composed of a number of MPE extrusions, with alternating layers of fins and extrusions, depending on the size and the desired heat exchange capacity of the heat exchanger.
  • Water (W) that has condensed between the tubes and the fins is collected and blocked from exit due to the capillary action from the surfaces of the tubes and the fins, restricting the water to travel to the bottom of the MPE.
  • the web opening i.e. where the material has been removed from the web
  • water condensed on the opposite side of the web-MPE will not be able to pass through the web and drain in the channel between the tubes on the other side. Surface tension will make the water stay in the areas where the fins are attached and stop the draining.
  • Figs. 2a-2d schematically illustrates Multi Port Extrusion (MPE) tubing (1) according to the invention.
  • the MPE comprises multiple individual transport tubes (T) for fluids having inner and outer surfaces, the tubes having a width (d) and a height (h), the tubes being separated by a web (2).
  • the web (2) is arranged to be located in a plane common with one of the outer surfaces of the tubes, so as to form a surface flush with one of the tube outer surfaces and forming an outer flat surface, so that a drain channel space (D), defined as the volume between two tubes and the web inner surface (s), i.e. the volume between the individual tubes of the MPE and the web, is large enough for the condensed water to drain by gravity.
  • D drain channel space
  • the MPE tubing of the invention as shown in figure 2b has a drain channel area (D) defined by the width (w) of the web, i.e. the tube distance and the drain channel depth (d).
  • the drain channel depth (d), i.e. the height of the individual tube minus the web thickness should preferably be at least 2 mm, more preferably at least 3 mm, in order for any condensed water to drain by gravity.
  • the width (w) of the web i.e. the distance between two tubes, is preferably at least 2 mm, preferably at least 3 mm and not more than 15 mm, preferably not more than 10 mm.
  • the cross sectional area of the drain channel between the web and the fin (d x w) is preferably from 2,5 mm 2 - 30 mm 2 , more preferably between 3,25 and 6,25 mm 2 .
  • the tubes do not necessarily need to be square, they can also be rectangular, hexagonal, round or of any geometrical shape, as schematically exemplified in Figs. 2e and 2f.
  • the depth of the drain channel will then be defined as the tube height, and the width of the web as the average distance between the two tubes.
  • the MPE has a substantially flat side formed the webs and one of the outer surfaces of the tubes.
  • openings can be provided in the webs.
  • the web (2) has openings creating a specific web pattern where the openings have a length L o , which is preferably as long as possible for effective drainage, while keeping the web length (L w ) long enough to give support the tubes and form a flat MPE.
  • the openings in the web can be made by for example roll punching, stamping, machining or by other means.
  • FIG. 2d showing a cross section through the Web-MPE in figure 2a at the location Tl-Tl in Fig. 2a shows how water is only blocked by the webs to a limited extent where only parts of the webs (21) are remaining so that the drainage capacity is significantly improved when the drain channel is made larger.
  • Fins (3) shown partially in the figure, are surrounding the vertically oriented MPE (1) and are attached to the extrusions at their crests by means of brazing or gluing.
  • Fig. 3 shows an evaporator/outdoor heat pump coil comprising Web-MPEs (1) according to the invention where the MPEs are joined to fins (3), the fins being undulated in the in the tube fluid transport direction and attached to the tube outer surfaces by brazing or gluing.
  • Heat exchangers of this type can be provided with two headers, one inlet header and one outlet header.
  • Fig. 3 shows only one header (4).
  • the Web-MPE also provides additional flexibility regarding formability (bending and twisting) of the profiles so that the tubes at the ends may be gathered and inserted into the header opening (5), provided therefor.
  • the openings (cuts) in the web have a width which is at least half of the web width, i.e. if the web width is 2 mm the web opening is at least 1 mm, preferably at least 3 ⁇ 4 of the web length. Most preferably the width of the web opening corresponds to the distance between two adjacent tubes in order to provide adequate draining of any condensate.
  • the invention as defined in the claims is not limited to the example as described above and shown in the figures.
  • the heat exchanger can be used, not only as condenser or evaporator in a refrigeration system, but in any system where heat is exchanged or recovered by means of air or other fluid.

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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)

Abstract

L'invention concerne un tube d'extrusion à orifices multiples (MPE) destiné à être utilisé dans des échangeurs de chaleur, comprenant de multiples tubes de transport individuels (T) pour des fluides séparés par des bandes (2), chaque tube ayant une hauteur (h), et chaque bande ayant une largeur (w), les bandes (2) étant agencées pour se trouver dans un plan commun avec l'une des surfaces externes des tubes de telle sorte que des canaux de drainage (10) sont formés entre des tubes adjacents, chacun ayant une zone de section transversale de canal de drainage (a) formée entre deux tubes adjacents et une surface interne (s) de la bande se trouvant entre les deux tubes adjacents, le tube MPE ayant un espace de canal de drainage (D) défini comme le volume entre deux tubes et la surface interne (s) de bande, et un échangeur de chaleur comprenant ladite MPE, la MPE étant entourée par des ailettes ondulées dans la direction de transport de fluide de tube dans de multiples couches alternées et les ailettes étant fixées aux MPE au niveau de leurs crêtes, la surface de section transversale du canal de drainage allant de 2,5 mm2 à 30 mm2, de préférence entre 3,25 et 6,25 mm2.
PCT/EP2019/077404 2018-10-12 2019-10-09 Mpe en bande à capacité de drainage améliorée WO2020074607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1851248 2018-10-12
SE1851248-3 2018-10-12

Publications (1)

Publication Number Publication Date
WO2020074607A1 true WO2020074607A1 (fr) 2020-04-16

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ID=68289923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/077404 WO2020074607A1 (fr) 2018-10-12 2019-10-09 Mpe en bande à capacité de drainage améliorée

Country Status (1)

Country Link
WO (1) WO2020074607A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11101594A (ja) * 1997-09-26 1999-04-13 Toyo Radiator Co Ltd 空調用熱交換器
WO2014133394A1 (fr) 2013-03-01 2014-09-04 Norsk Hydro Asa Conception d'extrusion à orifices multiples (mpe)

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11101594A (ja) * 1997-09-26 1999-04-13 Toyo Radiator Co Ltd 空調用熱交換器
WO2014133394A1 (fr) 2013-03-01 2014-09-04 Norsk Hydro Asa Conception d'extrusion à orifices multiples (mpe)

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