EP1895255A2 - Wärmetauscheranordnung mit zwei Betriebsarten - Google Patents

Wärmetauscheranordnung mit zwei Betriebsarten Download PDF

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Publication number
EP1895255A2
EP1895255A2 EP07075538A EP07075538A EP1895255A2 EP 1895255 A2 EP1895255 A2 EP 1895255A2 EP 07075538 A EP07075538 A EP 07075538A EP 07075538 A EP07075538 A EP 07075538A EP 1895255 A2 EP1895255 A2 EP 1895255A2
Authority
EP
European Patent Office
Prior art keywords
chamber
refrigerant
port
manifold
flow tubes
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.)
Granted
Application number
EP07075538A
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English (en)
French (fr)
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EP1895255B1 (de
EP1895255A3 (de
Inventor
Henry E. Beamer
Robert M. Runk
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Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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Filing date
Publication date
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Publication of EP1895255A2 publication Critical patent/EP1895255A2/de
Publication of EP1895255A3 publication Critical patent/EP1895255A3/de
Application granted granted Critical
Publication of EP1895255B1 publication Critical patent/EP1895255B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F28D1/0535—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 the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0209—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only transversal partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the present invention relates to a dual mode heat exchanger assembly and a method of operating the heat exchanger assembly.
  • Dual mode heat exchanger assemblies operate in a condenser mode for cooling and an evaporator mode for heating.
  • System operating requirements related to refrigerant phase, velocity and distribution vary between the condenser and the evaporator modes.
  • partially expanded two phase refrigerant enters the heat exchanger where the refrigerant continues to expand absorbing heat from the air.
  • Momentum effects due to large mass differences between gas and liquid phase can result in separation of the phases.
  • This two phase flow can result in poor refrigerant distribution in the heat exchanger assembly degrading performance in the evaporator mode and can cause icing/frosting of the core.
  • Dual mode heat exchanger assemblies and methods of addressing the differences in refrigerant flow characteristics are known in the art.
  • One approach involves modifying the pass arrangements depending on the mode of operation. This generally involves establishing a flow path length for circulating the refrigerant in the condenser mode and reducing the flow path length of the refrigerant in the evaporator mode, generally by bypassing some of the flow tubes that pass refrigerant between manifolds.
  • Another method involves inclusion of distribution tubes, structures with a plurality of apertures, to facilitate the distribution of the refrigerant within the manifolds when the heat exchanger assembly is operating in the evaporator mode.
  • the Heys ⁇ 510 Patent Application discloses a dual purpose heat exchanger assembly with an external bypass means of reducing the number of passes during the evaporator mode.
  • the heat exchanger assembly uses one port to introduce refrigerant and one port to exit refrigerant from the heat exchanger assembly.
  • the bypass means is associated with one of the manifolds, which, when open, connects the manifold with the port where refrigerant is introduced, to reduce the number of passes by at least one. This reduces the length of the flow path when the system is in evaporator mode reducing the pressure drop through the heat exchanger assembly and both improving efficiency and reducing ice formation on the heat exchanger assembly during the evaporator mode.
  • the Heys ⁇ 596 Patent Application discloses a dual mode heat exchanger assembly with an external bypass means of reducing the number of refrigerant passes when the heat exchanger assembly is operating in the evaporator mode. This is for a vehicle air conditioning system including the heat exchanger assembly in the ⁇ 510 patent.
  • the Chapp ⁇ 649 Patent discloses a dual mode heat exchanger assembly and includes curved headers to address the problem of condensate on the outside of the plurality of tubes in the evaporator mode.
  • the refrigerant enters the top manifold, drop through pipes to the lower manifold and is directed to the upper manifold through a jumper tube, more similar in diameter to the manifolds, where the refrigerant drops to the lower manifold and is exited through the outlet port.
  • the refrigerant When operating in the evaporator mode, the refrigerant enters the lower manifold and follows exactly the reverse path. Valves inside the heat exchanger assembly can also be used to direct the flow of refrigerant. The path length is the same for each mode.
  • the subject invention provides a heat exchanger assembly having a first manifold and a second manifold each defining a hollow cavity, and in spaced and substantially parallel relationship with each other.
  • a separator is disposed within the first manifold and divides the cavity of the first manifold into a first chamber and a second chamber.
  • a plurality of flow tubes are fluidly connected to the first and second manifolds for passing refrigerant between the manifolds.
  • a plurality of ports are connected to at least one of the first and second manifolds. Each of the ports have an open position for allowing refrigerant to flow into and out of the manifolds and a closed position for preventing refrigerant from flowing into and out of the manifolds.
  • An external controller switches the heat exchanger assembly between an evaporator mode and a condenser mode.
  • At least one of the ports in each of the chambers and cavity of one of the manifolds is in the open position for circulating refrigerant through all of the plurality of flow tubes in at least one pass when the heat exchanger assembly is operating in the evaporator mode and at least one of the ports is in the closed position for circulating refrigerant through the plurality of flow tubes in at least two passes when the heat exchanger assembly is operating in the condenser mode.
  • the subject invention also provides a method of operating a heat exchanger assembly circulating the refrigerant through all of the plurality of flow tubes in at least one pass in the evaporator mode and in more than one pass in the condenser mode, including the following steps: opening one of the ports in each of the manifolds to define an evaporator mode; introducing refrigerant into one of the manifolds; passing the refrigerant through all of the plurality of tubes in a single pass; exiting the refrigerant from an opposing manifold; closing the third port of the second manifold to define a condenser mode; introducing the refrigerant into one of the chambers of each one of the manifolds to define an inlet chamber; passing the refrigerant through the plurality of tubes connected to the inlet chamber; passing the refrigerant into another chamber of one of the manifolds to define a mid-flow chamber; passing the refrigerant through the plurality of tubes connected to the mid-flow chamber; passing the refriger
  • the subject invention also provides a method of operating a heat exchanger assembly circulating the refrigerant through all of the plurality of flow tubes in at least two circuits and in more than one pass in the evaporator mode and in more than one pass in the condenser mode, including the following steps: opening at least one of the ports in one of the manifolds to define an evaporator mode; introducing the refrigerant into one of the manifolds to define an inlet chamber; passing the refrigerant through the plurality of flow tubes connected to the inlet chamber; passing the refrigerant into the opposing manifold to define a mid-flow chamber; passing the refrigerant through the plurality of flow tubes connected to the mid-flow chamber; passing the refrigerant into the opposing manifold to define an outlet chamber; exiting the refrigerant through the port connected to the outlet chamber; closing the fourth port and opening the third and fifth ports to define a condenser mode; introducing the refrigerant into the third port of the second manifold to define
  • the subject invention optimizes heat exchange when the heat exchanger assembly is operating in both the evaporator mode as well as when the heat exchanger assembly is operating in the condenser mode, by using all of the plurality of flow tubes to circulate the refrigerant in one or more passes through the heat exchanger assembly when operating in the evaporator mode and circulating the refrigerant in more than one pass when the heat exchanger assembly is operating in the condenser mode.
  • Figure 1 is a perspective view of one embodiment of a heat exchanger assembly
  • Figure 1A is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 1 in an evaporator mode
  • Figure 1B is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 1 in a condenser mode
  • Figure 1C is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 1 illustrating a single pass refrigerant flow path in the evaporator mode;
  • Figure 1D is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 1 illustrating a two pass refrigerant flow path in the condenser mode;
  • Figure 2 is a perspective view of another embodiment of a heat exchanger assembly
  • Figure 2A is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 2 in an evaporator mode
  • Figure 2B is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 2 in a condenser mode
  • Figure 2C is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 2 illustrating a single pass refrigerant flow path in the evaporator mode;
  • Figure 2D is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 2 illustrating a three pass refrigerant flow path in the condenser mode;
  • Figure 3 is a perspective view of another embodiment of a heat exchanger assembly
  • Figure 3A is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 3 in an evaporator mode
  • Figure 3B is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 3 in a condenser mode
  • Figure 3C is a planar view of the embodiment of the heat exchanger assembly of Figure 3 illustrating a single pass refrigerant flow path in the evaporator mode;
  • Figure 3D is a schematic planar view of the embodiment of the heat exchanger assembly of Figure 3 illustrating a four pass refrigerant flow path in the condenser mode;
  • Figure 4 is a perspective view of another embodiment of a heat exchanger assembly with a distribution tube
  • Figure 4A is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a two circuit, two pass refrigerant flow path in an evaporator mode;
  • Figure 4B is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a four pass refrigerant flow path in a condenser mode.
  • Figure 4C is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a two pass refrigerant flow path in the evaporator mode.
  • Figure 4D is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a four pass refrigerant flow path in the condenser mode.
  • Figure 5 is a perspective view of another embodiment of a heat exchanger assembly with a distribution tube
  • Figure 5A is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a two pass refrigerant flow path in an evaporator mode
  • Figure 5B is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a four pass refrigerant flow path in a condenser mode.
  • Figure 5C is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a two pass refrigerant flow path in the evaporator mode
  • Figure 5D is a schematic planar view of the embodiment of the heat exchanger assembly illustrating a four pass refrigerant flow path in the condenser mode.
  • the heat exchanger assembly 20 includes a first manifold 22 and a second manifold 24.
  • the first manifold 22 defines a cavity 26 and has a length and a width, substantially transverse the length, with a first end 48 and a second end 50, adjacent the length.
  • the second manifold 24 is in spaced and substantially parallel relationship to the first manifold 22 and defines a cavity 27.
  • the second manifold 24 has a length and a width, substantially transverse the length, with a first end 49 and a second end 51, adjacent the length.
  • the second manifold 24 is shown throughout the drawings as having the same general appearance as that of the first manifold 22, however it can be readily appreciated that the first and second manifolds 22, 24 can have different dimensions, for example, the width of the second manifold 24 can be greater than the width of the first manifold 22.
  • the construction of the manifolds 22, 24 can vary, for example, but not limited to, the first manifold 22 can comprise a single piece and the second manifold 24 can comprise multiple joined pieces.
  • manifolds 22, 24 are illustrated throughout the various drawings as generally cylindrical, the manifolds can take on a variety of shapes, for example but not limited to, the cross section of the manifolds 22, 24 at the width, can define a D-shape or a polygon.
  • a first separator 38 is disposed within the cavity 26 of the first manifold 22 dividing the first manifold 22 into a first chamber 40 and a second chamber 42.
  • a substantially flat first separator 38 is shown which is disposed along the width of the first manifold 22, however, it can be readily appreciated that the first separator 38 can have a variety of cross-section shapes, such as, but not limited to, a crescent, and the first separator 38 can also be disposed within the cavity 26 in various ways, such as, but not limited to, diagonally forming acute and obtuse angles where the first separator 38 is adjacent the first manifold 22.
  • first separator 38 can be constructed in a variety of ways, such as, but not limited to, being a portion of an insert slideably inserted within the cavity 26 or a single piece inserted through a cut in the first manifold 22.
  • first separator 38 is shown approximately midway between the ends 48, 50 of the first manifold 22, it can be appreciated that the placement of the first separator 38 relative to the length of the first manifold 22 can vary.
  • additional separators can be disposed within the first manifold cavity 26.
  • a plurality of flow tubes 28 extend between and fluidly connect the first and second manifolds 22, 24 for passing refrigerant between the manifolds 22, 24. It can be appreciated that additional heat dissipating structures, such as fins 29, can be included adjacent the plurality of flow tubes 28.
  • the plurality of flow tubes 28 are substantially parallel to each other, and are generally transverse the length of the manifolds 22, 24. For purposes of illustration throughout the drawings, ten to twelve flow tubes are depicted, however it can be readily appreciated, that the number is not limited to those illustrated, but can vary based on the requirements of the heat exchanger assembly 20.
  • Groups of flow tubes 62, 64, 66, 68 are defined by flow tubes which are fluidly connected to the same chambers. Referring to Figure 1A-1B, a first group 62 of flow tubes is fluidly connected to the first chamber 40 and the cavity of the second manifold 27. A second group 64 of flow tubes is fluidly connected to the second chamber 40 and the first cavity 27. The groups 62, 64 of flow tubes enable the serpentine circulation path of the refrigerant through the heat exchanger assembly 20.
  • a plurality of ports 30 are fluidly connected to at least one of the manifolds 22, 24, and have an open position for allowing refrigerant into and out of the manifolds 22, 24 and a closed position for preventing the refrigerant from passing into or out of the manifolds 22, 24.
  • An external tube is fluidly connected to each of the ports 30, and refrigerant passes through the external tubes to enter or exit the heat exchanger assembly 20. It can be readily appreciated that the external tubes can be joined directly to any portion of the manifold 22, 24 in a variety of ways, including but not being limited to, by a process such as brazing or welding. Alternatively, an attachment means such as a coupler can be disposed within the port 30, and the external tube inserted through the coupler to form the connection.
  • the plurality of ports 30 are illustrated throughout the figures as including the external tube as part of the port 30. It can further be understood that the term port 30 within the context of the present invention is intended to include other structures, such as couplers, where required by a specific application. It can be readily appreciated that for the present invention, when reference is made to the port 30 having a closed position, refrigerant does not enter or exit the manifold 22, 24 at that location. Similarly when a port 30 is in the open position, refrigerant enters or exits the heat exchanger assembly 20 through the port 30. An external controller restricts or permits the flow of refrigerant into the port 30, and the actual means is external to the heat exchanger assembly 20.
  • a first port 92 is fluidly connected to the first chamber 40, a second port 94 is fluidly connected to the second chamber 42 and a third port 96 is fluidly connected to the cavity 27 of the second manifold 24. It can be appreciated that each port 92, 94, 96 can be used to either permit the refrigerant to enter or exit the heat exchanger assembly 20, depending on the configuration desired.
  • An external controller switches the heat exchanger assembly 20 between an evaporator mode 34 for heating and a condenser mode 36 for cooling.
  • the refrigerant is circulated through the heat exchanger assembly 20, absorbing heat from air passing over the plurality of flow tubes 28. As the refrigerant absorbs heat from the air, the refrigerant expands as liquid refrigerant is converted to gaseous refrigerant.
  • the condenser mode the refrigerant in a gaseous state, enters the heat exchanger assembly 20 and heat is dissipated as the refrigerant is changed from the gaseous state to a liquid state.
  • refrigerant is passed through all of the plurality of flow tubes 28 in one pass by opening at least one of the plurality of ports 30 in each of the chambers 40, 42 and cavities 27.
  • at least one of the plurality of ports 30 is closed, for allowing the refrigerant to pass through all of the plurality of flow tubes 28 in more than one pass. It can be readily appreciated, that a number of alternative embodiments are possible, by varying the number of separators, the number of ports 30 and the configuration of open and closed ports 30.
  • a second separator 52 is disposed within the cavity 27 of the second manifold 24 forming a third chamber 56 and a fourth chamber 58.
  • the second separator 52 is offset from the first separator 38.
  • the third port 96 is fluidly connected to the third chamber 56 and a fourth port 98 is fluidly connected to the fourth chamber 58.
  • Three groups of flow tubes are formed, including a first group 62 having flow tubes connected to the first chamber 40 and the third chamber 56, a second group 64 having flow tubes connected to the second chamber 42 and the third chamber 56, and a third group 66 having flow tubes connected to the second chamber 42 and the fourth chamber 58.
  • the first, second, third and fourth ports 92, 94, 96, 98 are in the open position for allowing the refrigerant to pass through all of the plurality of flow tubes 28 in one pass.
  • the first and fourth ports 92, 98 are in the open position for passing the refrigerant through the heat exchanger assembly 20 in three passes.
  • FIG. 3 another embodiment is illustrated having having a third separator 54 disposed within the second manifold 24 further dividing the cavity 27 of the second manifold 24 into a fifth chamber 60.
  • the second and third separators 52, 54 in the second manifold 24 are offset from the first separator 38 in the first manifold 22.
  • four groups of flow tubes 62, 64, 66, 68 are formed, including, a first group 62 having flow tubes connected to the first chamber 40 and the third chamber 56, a second group 64 having the flow tubes connected to the first chamber 40 and the fourth chamber 58, a third group 66 having the flow tubes connected to the second chamber 42 and the fourth chamber 58, and a fourth group 68, having flow tubes connected to the second chamber 42 and the fifth chamber 60.
  • the first, second, third, fourth and fifth ports 92, 94, 96, 98,100 are in the open position for allowing refrigerant to pass through the heat exchanger assembly 20 in one pass.
  • the third and fifth ports 96,100 are in the open position for passing the refrigerant through the heat exchanger assembly 20 in four passes.
  • FIG. 4 another embodiment is illustrated having no ports 30 connected to the first manifold 24.
  • a third separator 54 is disposed within the second manifold 24 further dividing the cavity 27 of the second manifold 24 into a fifth chamber 60.
  • the second and third separators 52, 54 in the second manifold 24 are offset from the first separator 38 in the first manifold 22.
  • four groups of flow tubes 62, 64, 66, 68 are formed, including, a first group 62 having flow tubes connected to the first chamber 40 and the third chamber 56, a second group 64 having the flow tubes connected to the first chamber 40 and the fourth chamber 58, a third group 66 having the flow tubes connected to the second chamber 42 and the fourth chamber 58, and a fourth group 68, having flow tubes connected to the second chamber 42 and the fifth chamber 60.
  • the third, fourth and fifth ports 96, 98, 100 are in the open position for allowing the refrigerant to pass through the heat exchanger assembly 20 in one pass.
  • the third and fifth ports 96, 100 are in the open position for passing the refrigerant through the heat exchanger assembly 20 in four passes.
  • Distribution tubes 70, 71 can be incorporated in the heat exchanger assembly 20 to facilitate distribution of the refrigerant in the evaporator mode 34.
  • FIG 4-4B one embodiment is illustrated which includes a single distribution tube 70 disposed within the fourth chamber 58 of the second manifold 24.
  • the third, fourth and fifth ports 96, 98, 100 are in the open position.
  • the refrigerant enters through the fourth port 98 which is directly connected to the distribution tube 70, and passes through the plurality of apertures disposed within the distribution tube 70, into the fourth chamber 58.
  • the fourth port 98 is in the closed position and the third and fifth ports 96,100 are in the open position.
  • Refrigerant enters through the third port 96, and is circulated through the heat exchanger assembly 20, without being affected by the presence of the distribution tube 70 disposed within the fourth chamber. It can be readily appreciated that more than one distribution tube 70 can be included in the heat exchanger assembly 20.
  • another embodiment includes the first distribution tube 70 disposed within the third chamber 56 and a second distribution tube 71 disposed within the fifth chamber 60.
  • a sixth port 102 is fluidly connected to the third chamber 56 and a seventh port 104 is fluidly connected to the fifth chamber 60.
  • the third port 96 is fluidly connected to the first distribution tube 70 and the fifth port 100 is fluidly connected to the second distribution tube 71.
  • the evaporator mode 34 is defined by the first, second, sixth and seventh ports 92, 94, 102,104 being in the closed position and the third, fourth and fifth ports 96, 98, 100 being in the open position.
  • the condenser mode 36 is defined by the sixth and seventh ports 102, 104 being in the open position and the first, second, third, fourth and fifth ports 92, 94, 96, 98, 100 being in the closed position. It can be readily appreciated that any number of distribution tubes 70, 71 and additional ports 30 can be incorporated into any design. It can also be readily appreciated that the same result would be accomplished where the first manifold 22 included no ports 30.
  • the various embodiments described previously can be generally descibed in the following way.
  • An external controller 32 switches between an evaporator mode 34 for heating and a condenser mode 36 for cooling.
  • the first, second and third ports 92, 94, 96 are in the open position for circulating the refrigerant through all of the plurality of flow tubes 28 in n passes in the evaporator mode 34.
  • the condenser mode 36 at least one of the ports 30 is closed for circulating the refrigerant through all of said plurality of flow tubes 28 in at least n+1 passes in the condenser mode 36 where said n is an integer equal to or greater than one.
  • distribution tubes 70, 71 can by included in any of the evaporator mode 34 inlet chambers 78.
  • the distribution tubes 70, 71 are fluidly connected to the ports 30, and refrigerant passes through the apertures disposed within the distribution tubes 70, 71 into the evaporator mode 34 inlet chamber 78.
  • additional ports 30 can be fluidly connected to the condenser mode 36 inlet and outlet chambers 78, 80 for allowing refrigerant to enter and exit the heat exchanger assembly 20.
  • a heat exchanger assembly 20 has a first manifold 22 divided into a first chamber 40 and a second chamber 42 with a first port 92 and second port 94, a second manifold 24 defining at least one chamber with a third port 96, and a plurality of flow tubes 28 fluidly connecting the manifolds 22, 24.
  • the method includes the step of opening one of the ports 30 in each chamber of the manifolds 22, 24 defining an evaporator mode 34.
  • the method further includes introducing the refrigerant into one of the manifolds 22, 24, to define an inlet chamber 78.
  • the method further includes passing the refrigerant through all of the plurality of flow tubes 28 in a single pass.
  • the method further includes the step of passing the refrigerant into an opposing manifold 22, 24 defining an outlet chamber 80.
  • the method further includes the step of exiting the refrigerant from a port connected to the opposing manifold 22, 24.
  • the method further includes the step of closing the third port 96 of the second manifold 24 to define a condenser mode 36.
  • the method further includes the step of introducing the refrigerant into one of the chambers of one of the manifolds 22, 24 to define an inlet chamber 78.
  • the method further includes the step of passing the refrigerant through the plurality of flow tubes 28 connected to the inlet chamber 78.
  • the method further includes the step of passing the refrigerant into another chamber of one of the manifolds 22, 24 to define a mid-flow chamber 72.
  • the method further includes passing the refrigerant through the plurality of flow tubes 28 connected to the mid-flow chamber 72.
  • the method further includes passing the refrigerant into another chamber of one of the manifolds 22, 24 to define an outlet chamber 80.
  • the method further includes the step of exiting refrigerant through the port connected to the outlet chamber 80.
  • the method allows refrigerant to pass through the heat exchanger assembly 20 in one pass when the heat exchanger assembly 20 is operating in the evaporator mode 34, and in more than one pass when the heat exchanger assembly 20 is operating in the condenser mode 36. It can be readily appreciated that the method encompasses heat exchanger assemblies 20 having manifolds 22, 24 with different numbers of chambers and ports.
  • the refrigerant is introduced into the first and second ports 92, 94, passes through all of the plurality of flow tubes 28 in a single pass, and is exited from the second manifold 24.
  • the third port 96 is closed.
  • the refrigerant is introduced into the second chamber 42, and passes through the second group 64 of flow tubes into the third chamber 56.
  • the refrigerant is then passed through the first group 62 of flow tubes into the first chamber 40.
  • the refrigerant is then exited through the first port 92.
  • the refrigerant when the heat exchanger 20 is operating in the evaporator mode 34, the refrigerant can alternatively be introduced through the third port 96 into the third chamber 56. Similarly, when the heat exchanger 20 is operating in the condenser mode 36, the refrigerant can be introduced through the first port 92 into the first chamber 40. It can be further appreciated that distribution tubes 70, 71 can by included in any of the evaporator mode inlet chambers 78. The distribution tubes 70, 71 are fluidly connected to the ports 30, and refrigerant passes through the apertures disposed within the distribution tubes 70, 71 into the evaporator mode 34 inlet chamber 78.
  • this embodiment includes a fourth chamber 58 and a fourth port 98 fluidly connected to the fourth chamber 58.
  • the method further includes the step of closing the second port 94 of the first manifold 22 as well the third port 96 of the second manifold 24 and opening the first port 92 of the first manifold 22 and the fourth port 98 of the second manifold 24 to define the condenser mode 36.
  • the method is the same for the evaporator mode 34 as in the previous embodiment.
  • the refrigerant is passed through the plurality of flow tubes 28 connected to the mid-flow chamber 72.
  • the method further includes passing the refrigerant into another chamber of one of the manifolds 22, 24 to define a second mid-flow chamber 74.
  • the method further includes passing a refrigerant through the plurality of flow tubes 28 connected to the second mid-flow chamber 74.
  • the method further includes passing the refrigerant into another chamber of one of the manifolds 22, 24 to define an outlet chamber 80.
  • the method further includes the step of exiting refrigerant through the port connected to the outlet chamber 80.
  • the method allows refrigerant to pass through the heat exchanger assembly 20 in one pass in the evaporator mode 34, and in three or more passes when the heat exchanger assembly 20 is operating in the condenser mode 36. It can be readily appreciated that the method encompasses heat exchanger assemblies 20 having manifolds 22, 24 with different numbers of chambers and ports.
  • FIG. 2C-2D This general embodiment is illustrated in a more specific embodiment illustrated in Figures 2C-2D.
  • the refrigerant is introduced into the first and second ports 92, 94, 96, 98 in each of the manifolds 22, 24 are opened.
  • the refrigerant is introduced into the first and second ports 92, 94, passes through all of the plurality of flow tubes 28 in a single pass, and is exited from the third and fourth ports 96, 98 of the second manifold 24.
  • the condenser mode 36 is defined by closing the second and third port 94, 96.
  • the refrigerant is introduced into the first chamber 40, passed through the first group 62 of flow tubes, into the third chamber 56. Refrigerant is then passed through the second group 64 of flow tubes into the second chamber 42.
  • Refrigerant then passes through the third group 66 of flow tubes into the fourth chamber 58, and is exited through the fourth port 98.
  • the refrigerant can alternatively be introduced through the third port 96 and fourth port 98 into the third and fourth chambers 56, 58, and exited through the first and second ports 92, 94 in the first manifold 22.
  • the refrigerant can be introduced through the fourth port 98, passed into the fourth chamber 58, and exited through the first port 92 in the first chamber 40.
  • distribution tubes 70, 71 can by included in any of the evaporator mode 34 inlet chambers 78.
  • the distribution tubes 70, 71 are fluidly connected to the ports 30, and refrigerant passes through the apertures disposed within the distribution tubes 70, 71 into the evaporator mode 34 inlet chamber 78.
  • additional ports 30 can be fluidly connected to the condenser mode 36 inlet and outlet chambers 78, 80 for allowing refrigerant to enter and exit the heat exchanger assembly 20 in the condenser mode 36.
  • FIG. 3A-3D another embodiment of the method of operating a heat exchanger assembly 20 is provided wherein the refrigerant circulates in one pass in the evaporator mode 34 and in at least four passes in the condenser mode 36.
  • the heat exchanger assembly 20 includes the elements of the previous embodiment, with the addition of a fifth chamber 60 disposed within the second manifold 24 and a fifth port 100 fluidly connected to the fifth chamber 60.
  • the evaporator mode is the same as described in the previous embodiment.
  • the condenser mode 36 is defined by the step of closing the first and second ports 92, 94 of the first manifold 22 and the fourth port 98 of the second manifold 24 to define a condenser mode 36.
  • the method further includes the step of introducing the refrigerant into one of the chambers of one of the manifolds to define an inlet chamber 78.
  • the method further includes the step of passing the refrigerant through the plurality of flow tubes 28 connected to the inlet chamber 78.
  • the method further includes the step of passing the refrigerant into another chamber of one of the manifolds 22, 24 to define a first mid-flow chamber 72.
  • the method further includes passing the refrigerant through the plurality of flow tubes 28 connected to the first mid-flow chamber 72.
  • the method further includes the step of passing the refrigerant into another chamber of one of the manifolds 22, 24 to define a second mid-flow chamber 74.
  • the method further includes passing the refrigerant through the plurality of flow tubes 28 connected to the second mid-flow chamber 74.
  • the method further includes the step of passing the refrigerant into another chamber of one of the manifolds 22, 24 to define a third mid-flow chamber 76.
  • the method further includes passing the refrigerant through the plurality of flow tubes 28 connected to the third mid-flow chamber 76.
  • the method further includes passing the refrigerant into another chamber of one of the manifolds 22, 24 to define an outlet chamber 80.
  • the method further includes the step of exiting refrigerant through the port connected to the outlet chamber 80.
  • the method allows refrigerant to pass through the heat exchanger assembly 20 in one pass when the heat exchanger assembly 20 is operating in the evaporator mode 34, and in four or more passes when the heat exchanger assembly 20 is operating in the condenser mode 36. It can be readily appreciated that the method encompasses heat exchanger assemblies 20 having manifolds 22, 24 with different numbers of chambers and ports.
  • the evaporator mode is defined by opening all of the ports 92, 94, 96, 98, 100 in each of the manifolds 22, 24.
  • the refrigerant is introduced into the first and second ports 92, 94, circulated through all of the plurality of flow tubes 28 in a single pass, and exited from the third, fourth and fifth ports 96, 98,100.
  • the condenser mode is defined by closing the first, second and fourth ports 92, 94, 98.
  • the refrigerant is introduced through the third port 96 into the third chamber 56, and passed through the first group 62 of flow tubes, into the first chamber 40.
  • the refrigerant passes through the second group 64 of flow tubes into the fourth chamber 58.
  • the refrigerant passes through the third group 66 of flow tubes into the second chamber 42.
  • the refrigerant passes through the fourth group 68 of flow tubes into the fifth chamber 60, and is exited through the fifth port 100.
  • the refrigerant can alternatively be introduced through the third, fourth and fifth ports 96, 98, 100 of the second manifold 24, and exited through the first and second ports 92, 94 of the first manifold 22.
  • the refrigerant can be introduced through the fifth port 100 into the fifth chamber 60, and exited through the third port 96 connected to the third chamber 56.
  • this method encompasses any number of passes in the evaporator mode and in the condenser mode.
  • distribution tubes 70, 71 can by included in any of the evaporator mode inlet chambers 78.
  • the distribution tubes 70, 71 are fluidly connected to the ports 30, and refrigerant passes through the apertures disposed within the distribution tubes 70, 71 into the evaporator mode 34 inlet chamber 78.
  • FIG. 4A-4D another method for operating a heat exchanger assembly 20 is provided where the refrigerant is divided into more than one circuit and passes through the heat exchanger assembly 20 in at least two passes in the evaporator mode 34.
  • the refrigerant passes through the heat exchanger assembly 20 in four or more passes, as previously described and being illustrated at Figure 3D, and will not be described again here.
  • the heat exchanger assembly 20 has a first manifold 22 divided into a first chamber 40 and a second chamber 42 and a second manifold 24 defining a third chamber (56), a fourth chamber (58) and a fifth chamber (60), with a third port (96), a fourth port 98, a fifth port 100 and a plurality of flow tubes 28 fluidly connecting the manifolds 22, 24.
  • the method includes the step of opening all of the ports 30 in the second manifold 24 to define an evaporator mode 34.
  • the method further includes the step of introducing the refrigerant into at least one chamber of the second manifold 24 to define an inlet chamber 78.
  • the method further includes the step of passing the refrigerant through the plurality of flow tubes 28 connected to the inlet chamber 78.
  • the method further includes the step of passing the refrigerant into the first manifold 22 to define a first and second mid-flow chamber 72, 74.
  • the method further includes the step of passing the refrigerant through the plurality of flow tubes 28 connected to the first and second mid-flow chambers 72, 74.
  • the method further includes the step of passing the refrigerant into the second manifold 24 to define at least one outlet chamber 80.
  • the method further includes the step of exiting the refrigerant through the port connected to the outlet chamber 80. It can be readily appreciated that the method encompasses more complex heat exchanger assemblies 20 requiring more than two circuits as well as more than two passes for the circulation of the refrigerant.
  • the evaporator mode 34 is defined by opening all of the ports 96, 98, 100 in the second manifold 24.
  • the refrigerant is introduced into the fourth chamber 58 of the second manifold 24, where it is separated into a first portion and a second portion.
  • the first portion of the refrigerant passes through the second group 64 of flow tubes into the first chamber 40, through the first group 62 of flow tubes into the third chamber 56, and is exited through the third port 96.
  • the second portion passes through the third group 66 of flow tubes, into the second chamber 42, through the fourth group 68 of flow tubes into the fifth chamber 60, and is exited from the fifth port 100.
  • the refrigerant can be introduced through the third and fifth ports 96, 100 and exited through the fourth port 98, thus creating more than one inlet chamber 78, 79 and one outlet chamber 80. It can also be readily appreciated that the same flow path is possible by closing all of the ports 30 of the first manifold 22 in embodiments which include ports 30 in the first manifold 22.
  • distribution tubes 70 can by included in any of the evaporator mode 34 inlet chambers 78. The distribution tube 70 is fluidly connected to the port 30, and refrigerant passes through the apertures disposed within the distribution tubes 70, 71 into the evaporator mode inlet chamber 78. Here, the distribution tube 70 is illustrated as being disposed within the fourth chamber 58.
  • an embodiment is illustrated including distribution tubes 70, 71 in chambers used as both evaporator mode inlet chambers and condenser mode 36 outlet chamber 80 and the condenser mode 36 inlet chamber 78.
  • the evaporator mode 34 is defined by opening the third, fourth and fifth ports 96, 98,100.
  • a first portion of the refrigerant is introduced into the third port 96 and a second portion of the refrigerant into the fifth port 98.
  • the first portion of the refrigerant passes through the first distribution tube 70 into the third chamber 56.
  • the refrigerant then passes through the first group 62 of flow tubes, into the first chamber 40, through the second group 64 of flow tubes into the fourth chamber 58.
  • the second portion passes into the second distribution tube 71, into the fifth chamber 60, through the fourth group 68 of flow tubes, into the first chamber 40, through the third group 66 of flow tubes, and into the fourth chamber 58. All of the refrigerant is then exited through the fourth port 98.
  • the condenser mode 36 is defined by closing the first, second, third, fourth and fifth port 92, 94, 96, 98, 100 and opening the sixth and seventh ports 102, 104.
  • the refrigerant is introduced through the seventh port 104 into the fifth chamber 60, passes through the fourth group 68 of flow tubes, and into the second chamber 42.
  • the refrigerant then passes through the third group 66 of flow tubes, into fourth chamber 58.
  • the refrigerant then passes through the second group 64 of flow tubes, into the first chamber 40, and through the first group 62 of flow tubes into the third chamber 56.
  • the refrigerant is exited through the sixth port 102. It can be readily appreciated that when the heat exchanger 20 is operating in the condenser mode 36, the refrigerant can alternatively be introduced into the sixth port 102 and exited through the seventh port 104.

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  • 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)
  • Air-Conditioning For Vehicles (AREA)
  • External Artificial Organs (AREA)
EP07075538A 2006-07-25 2007-06-29 Wärmetauscheranordnung mit zwei Betriebsarten Active EP1895255B1 (de)

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US11/492,476 US20080023182A1 (en) 2006-07-25 2006-07-25 Dual mode heat exchanger assembly

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EP1895255A2 true EP1895255A2 (de) 2008-03-05
EP1895255A3 EP1895255A3 (de) 2008-11-26
EP1895255B1 EP1895255B1 (de) 2009-11-18

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DE102017211256A1 (de) 2017-07-03 2019-01-03 Audi Ag Kälteanlage für ein Fahrzeug mit einem einen Wärmeübertrager aufweisenden Kältemittelkreislauf sowie Wärmeübertrager für eine solche Kälteanlage
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US20080023182A1 (en) 2008-01-31
ATE449301T1 (de) 2009-12-15
EP1895255B1 (de) 2009-11-18
EP1895255A3 (de) 2008-11-26
DE602007003279D1 (de) 2009-12-31

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