EP2232186A1 - Dispositif d'échange de chaleur et véhicule automobile - Google Patents

Dispositif d'échange de chaleur et véhicule automobile

Info

Publication number
EP2232186A1
EP2232186A1 EP08870681A EP08870681A EP2232186A1 EP 2232186 A1 EP2232186 A1 EP 2232186A1 EP 08870681 A EP08870681 A EP 08870681A EP 08870681 A EP08870681 A EP 08870681A EP 2232186 A1 EP2232186 A1 EP 2232186A1
Authority
EP
European Patent Office
Prior art keywords
flow
coolant
exhaust gas
channels
channel
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Withdrawn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
EP08870681A
Other languages
German (de)
English (en)
Inventor
Johannes Diem
Eberhard Pantow
Ulrich Maucher
Peter Geskes
Martin KÄMMERER
Klaus Irmler
Jens Holdenried
Michael Schmidt
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP2232186A1 publication Critical patent/EP2232186A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/06—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being attachable to the element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • 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
    • F28D2021/0071—Evaporators
    • 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
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0085—Evaporators
    • 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
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the invention relates to a device for exchanging heat.
  • the invention relates to a motor vehicle with such a device.
  • a heat energy recovery from exhaust gases of an internal combustion engine attained a steadily increasing importance in the field of automotive engineering.
  • the recovery of heat energy by means of exhaust gas evaporator continues into the focus in order to achieve an increase in efficiency in terms of the operation of the internal combustion engine.
  • heat is removed from the exhaust gas, which is supplied to a cooling or refrigerant, which is usually vaporized.
  • the heat energy extracted from the exhaust gas can be used for a downstream Clausius-Rankine process, for example.
  • this document is concerned with document DE 601 23 987 T2, in which a Rankine cycle system is described in connection with an internal combustion engine, in which a high-temperature and high-pressure steam can be generated using an evaporator by means of heat energy of an exhaust gas of the internal combustion engine ,
  • BEST ⁇ T1GUNGSKOPIE It is an object of the present invention to build a device for exchanging heat in a particularly compact and efficient manner, in particular with regard to use in a motor vehicle.
  • the object of the invention is achieved by a device for exchanging heat with the features of patent claim 1 and by a motor vehicle having the features of patent claim 14.
  • the basic idea of the invention is to guide a serpentine in a disk heat exchanger of one of the participating media within one of the stacked planes.
  • the present exhaust gas evaporator is configured in a so-called sandwich construction, in which exhaust gas levels anddemit- telebenen are arranged alternately directly next to each other, the exhaust gas planes can contact the coolant planes over a large area, so that a heat energy transfer from the exhaust gases to the coolant particularly fast and can be done effectively.
  • a first flow space has a first flow path with flow path sections for the first medium which can be flowed through in succession in opposite directions. loading
  • the flow path sections are preferably separated from one another by a partition wall arranged between the at least two panes of the at least one pair of panes.
  • An embodiment is preferred in which two flow path sections which can be flowed through immediately one after the other are connected to one another via a deflection section.
  • the deflection is formed by a recess, particularly advantageously a breakthrough in the partition.
  • the deflecting section is formed by a gap remaining between the dividing wall and a lateral boundary of the first flow space, particularly advantageously the disk pair.
  • the two or more partitions are formed by an additional disk arranged between the at least two disks of the at least one pair of disks and designed in particular as a corrugated metal sheet.
  • At least one flow path section has one, two or more than two flow channels through which flow is possible in parallel.
  • at least two of the flow channels of the at least one flow path section are connected to one another via the deflection section.
  • an embodiment in which the flow channels are closed at their end faces advantageously by limiting the first flow space, particularly advantageous by one or both discs of the disc pair.
  • a preferred embodiment is one in which a first deflection section adjoins a second flow channel on a first partition wall of a first flow channel on a first end side of the first flow channel and a second deflection section on a second partition wall of the first flow channel on a second end face of the first flow channel opposite the first end side are arranged to one of the second flow channel different third flow channel.
  • flow channels together with the deflection channels form a single serpentine-like meandering flow path through the first flow space.
  • the second flow space has a larger flow cross section than a flow path section of the flow path in the first flow space, in particular a larger flow cross section than the first flow space.
  • Such an embodiment is designed in particular for operation with a liquid, optionally evaporating first medium and a gaseous second medium.
  • the device according to the invention is used in a motor vehicle with an internal combustion engine, an exhaust pipe and advantageous for the exchange of heat between a coolant, in particular a cooling circuit of the engine and the exhaust gas or between a Refrigerant refrigerant circuit of an air conditioner and the exhaust gas, wherein the coolant or the refrigerant is evaporated in particular in the device used.
  • the exhaust gas is preferably the second medium.
  • the first flow channels are preferably arranged substantially vertically, particularly preferably substantially perpendicular to a stationary surface of the motor vehicle.
  • exhaust system is understood to mean any components through which exhaust gases of an internal combustion engine are routed after the internal combustion engine has left the engine.
  • exhaust system also encompasses components of an exhaust gas recirculation system.
  • the exhaust gas evaporator described here may be advantageously integrated.
  • coolant describes any vaporizable working medium by means of which heat energy can be absorbed and transported in sufficient quantity, in particular water, which can also be present as water vapor, is particularly suitable for this purpose.
  • the coolant levels can be connected in parallel be so that it is ensured that all coolant levels are independently supplied with coolant. It is also possible that one or more coolant levels are connected in series with each other.
  • the cooling means can be guided particularly advantageously along and in the coolant plane if a plurality of mutually parallel coolant channels, such as flow channels, are arranged in each of the coolant planes.
  • a plurality of mutually parallel coolant channels such as flow channels
  • long, narrow coolant channels can be advantageously provided, in which the coolant can quickly heat up.
  • the exhaust gases are also arranged in the exhaust gas level for a plurality of mutually parallel exhaust gas ducts.
  • these exhaust ducts may extend linearly through the exhaust gas evaporator with respect to their end faces from an exhaust gas evaporator inlet side to an exhaust gas evaporator outlet side.
  • the exhaust ducts are each open at their end faces, so that the exhaust gases can flow into the exhaust ducts via openings in the end faces and can flow out again.
  • a plurality of exhaust gas channels in the exhaust gas plane is preferably arranged next to one another, so that a plurality of exhaust gas channels are arranged between a first side region and a second side region.
  • the exhaust gases can be passed over a wide area in the plurality of exhaust passages in a first main flow direction through the exhaust gas evaporator.
  • the exhaust gas evaporator can be designed to be particularly simple if the coolant channels are arranged on the evaporator side similar or even identical aligned, such as the exhaust gas channels on the exhaust side.
  • the coolant in order for the coolant to absorb heat energy from the exhaust gases in a particularly effective manner, it is advantageous if the coolant can remain in the exhaust gas evaporator for a sufficiently long time. This can be realized, for example, on the one hand by the coolant passing through the exhaust gas evaporator at a lower flow rate. On the other hand, the exhaust gas evaporator can be made longer.
  • a preferred embodiment variant provides that the coolant in the exhaust gas evaporator in a coolant plane travels a particularly long distance through the exhaust gas mixture. steamer can put back. Structurally particularly simple such a long distance can be realized in a coolant plane, when the coolant channels are spatially interconnected. Due to the spatial connection, the coolant can flow from a coolant channel to a further coolant channel and thus linger particularly long in time in the exhaust gas evaporator.
  • the coolant channels are closed at their end faces.
  • openings on end faces, for example, of two coolant channels directly adjacent to one another and / or corresponding to one another to be connected to one another by suitable piping.
  • suitable connection openings between two coolant channels may be provided in a common partition wall.
  • a preferred embodiment also provides that on a first partition wall of a first coolant channel on the first end face of the first coolant channel, a first connection opening to a second coolant channel and on a second partition wall of the first coolant channel on a second end side of the first coolant channel, a second connection opening to a further coolant channel are arranged.
  • all the coolant channels of a coolant plane can be combined to form a meandering coolant path.
  • connection openings can be provided on each partition wall.
  • cooling channels can be connected in parallel, in which the connection openings are provided in a suitable manner to the partitions and / or on the end faces.
  • the coolant channels together form a single meanderingdeffenwegrange through the exhaust gas evaporator.
  • the exhaust gas evaporator has a coolant path and an exhaust gas path, wherein the coolant path is arranged differently oriented in the exhaust gas evaporator than the exhaust gas path.
  • the exhaust gases and the coolant can flow through the exhaust gas evaporator, for example, in crossflow. It is clear that the exhaust gases and the coolant could also flow in opposite directions to each other with the channels selected.
  • the object of the invention is also achieved by a method for operating an internal combustion engine of a motor vehicle, in which exhaust gases of the internal combustion engine are conducted by means of an exhaust system into the environment and the exhaust gases before by means of evaporable coolant heat energy is withdrawn, and in which the exhaust gases be passed within an exhaust gas evaporator in a first main flow direction and the coolant in a main flow direction opposite to the main direction of flow through the Abgasverdamp- fer, wherein the cooling means are passed in sections transversely to the main flow directions through the exhaust gas evaporator.
  • the exhaust gases and the coolant are thereby moved not only in countercurrent to each other through the exhaust gas evaporator, but also in cross flow, whereby in particular the coolant remain temporally particularly long in the exhaust gas evaporator and this can heat or heat particularly well.
  • both the exhaust gas channels and the coolant channels can be arranged differently in the exhaust gas evaporator.
  • the coolant channels are arranged substantially vertically aligned within the exhaust gas evaporator, in particular substantially vertically to a road surface.
  • an inlet opening of the coolant planes is placed on the underside so that reliable operation can be ensured that the coolant channels of a coolant plane can initially be supplied with coolant, in particular with water , That is, at all coolant channels of the exhaust gas evaporator is ideally before a commutation of an internal combustion engine coolant available, so that a uniform evaporation of the coolant can be ensured in the coolant levels.
  • an uncritical inclination angle of the exhaust gas evaporator which is to be set correspondingly and which still prevents approximately an edge coolant channel and / or an edge coolant plane from being critically flooded with water, but not an opposite edge coolant channel and / or an opposite edge coolant plane, can be even more permissible and less critical
  • the inclination angle must be reduced by more than 5 °, ideally by approx. 10 °, so that unfavorable inclinations, for example, due to a tilted installation of an internal combustion engine, an exhaust system in a motor vehicle and / or an unfavorable inclination of the vehicle itself, can be prevented.
  • edge can coolant channels and / or coolant levels are additionally marked, which are arranged opposite the other coolant channels or coolant levels outside of the exhaust gas evaporator.
  • the aforementioned inclination angle may ideally be measured from a vertical plane.
  • the channels of the exhaust gas evaporator can be formed and configured in many different ways.
  • the coolant channels may be formed as a tube bundle or in plate construction with separating webs.
  • the exhaust gas evaporator can be produced if coolant channels of a coolant plane are formed by means of a corrugated sheet folded several times in the plane.
  • Such a corrugated sheet can advantageously form, for example, in combination with separating plates arranged parallel to the planes present here, wherein the exhaust gas channels can also be realized in a particularly simple manner by means of separating webs arranged on such a separating plate.
  • smooth channel walls can be provided.
  • the dimensions of the cooling channels can be influenced almost arbitrarily by differently selected dimensions of the channel side walls or channel bottom walls.
  • a change in the channel width can bring about a pressure loss and / or a change in the thermal energy transfer surface.
  • the width of the channels can also influence the number of channels in an exhaust gas evaporator and / or the total path length of a coolant path of a coolant plane.
  • the exhaust gas guide and theisserschleit can be designed loosely lucrative. From the hot exhaust gases, thermal energy can pass into the coolant particularly well if the exhaust gas guide device in an exhaust gas plane is designed in parallel flow and the coolant guide device in a coolant plane in the serpentine flow. Characterized in that the exhaust gas is flowed through in parallel flow, the exhaust gases can pass through the exhaust gas evaporator, for example, at high speed and uncritical dynamic pressure, while the coolant can dwell sufficiently long in the exhaust gas evaporator through the serpentine, so that it can absorb the heat energy particularly effective.
  • the flow guidance in exhaust gas evaporators can be a decisive criterion for a particularly good performance.
  • the strength of an exhaust gas evaporator can be significantly influenced.
  • the performance can run in two optimization directions. On the one hand, one wants to achieve a minimal pressure loss by avoiding any deflections or internal structures within a distance. On the other hand, the largest possible area for heat energy transfer should be available.
  • the pressure loss it should be noted for the pressure loss that the working medium very much reduces its density with the change in the state of matter, in particular from liquid to gaseous, and this can multiply the flow velocity. Therefore, a specific optimum between pressure loss and heat output must be found.
  • the strength is another important issue, since the working medium, in particular a coolant, usually has to be operated above the ambient pressure at working pressures in order to achieve sufficiently good effectiveness in connection with the exhaust gas evaporator.
  • the selected geometries of the components used must be able to absorb easily about the resulting by the working pressures occurring spinning forces. Thermal stresses, such as caused by temperature differences between the two working media, ie the exhaust gases on the one hand and the coolant on the other hand, must also be able to be absorbed.
  • the selected sheet thickness of a corrugated sheet also has a direct influence on the strength, in particular if individual sheet metal areas of the exhaust gas evaporator are used as tie rods. Furthermore, the sheet thickness can affect the thermal conductivity.
  • Another way to increase the effectiveness may be that in the channels turbulence generating structures are provided.
  • the present exhaust gas evaporator in particular with regard to a multi-folded in a plane corrugated sheet, this can be easily ensured.
  • the exhaust gas evaporator described here can be used advantageously in almost all motor vehicles, in particular also in commercial vehicles.
  • FIG. 1 schematically shows a view of a motor vehicle with an internal combustion engine and an exhaust system with an exhaust gas evaporator
  • FIG. 2 schematically shows a perspective view of the exhaust gas evaporator from FIG. 1,
  • FIG. 3 schematically shows a partially sectioned view of the exhaust gas evaporator from FIGS. 1 and 2,
  • FIG. 4 schematically shows a perspective view of a corrugated sheet metal of the exhaust gas evaporator from FIGS. 1 to 3 for realizing a first coolant plane
  • the motor vehicle 1 shown in FIG. 1 comprises an internal combustion engine 2 with a downstream exhaust system 3, in which an exhaust gas evaporator 5, a catalytic converter 6, an intermediate silencer 7 and an end silencer 8 are arranged in an exhaust gas line 4 in this exemplary embodiment.
  • the motor vehicle 1 stands with four wheels 9 (numbered here only by way of example) on a road surface 10 which, according to the illustration of FIG. 1, lies in the plane of the paper.
  • the exhaust gas evaporator 5 is shown in more detail in Figures 2 to 4, in particular in Figure 2, the Sandvvichbauweise 11 of the exhaust gas evaporator 5 clearly numbered with its many exhaust levels 12 (here only exemplified) and its many coolant levels 13 (here also only exemplified ) is recognizable.
  • the exhaust gas levels 12 are somewhat stronger in terms of their thickness 14 than the narrower coolant levels 13, so that exhaust gases can pass through the exhaust gas levels 12 quickly.
  • the two outer planes are exhaust gas levels 12, so that it is ensured that all coolant levels 13 are enclosed on both sides by exhaust gas levels 12. As a result, the coolant in the coolant planes 13 can be heated particularly quickly.
  • Both the coolant planes 13 and the exhaust gas levels 12 are arranged in the exhaust gas evaporator 5 in a vertical orientation 15, wherein the bottom 16 of the exhaust gas evaporator 5 faces the road surface 10. According to the sandwich construction 11 of the present exhaust gas evaporator 5, a coolant plane 13 follows an exhaust gas plane 12.
  • the coolant which in this embodiment is water or in the heated state steam 17 (see FIG. 3), passes via an inlet opening 18 (see FIG. 4) into a coolant channel 19 according to a main flow direction 20.
  • the coolant meanders in the coolant planes 13 through the coolant Exhaust gas evaporator 5 and takes in this case more and more heat energy from the exhaust gases, which flow through the exhaust gas levels 12 in accordance with the main flow direction 21 substantially linear.
  • connection openings 23 (numbered here only by way of example)
  • coolant channels 25 (here only exemplarily numbered) of the coolant planes 13 and so meanders along the main flow direction 20.
  • AiIe Kühiffenkanäle 19 and 25 are arranged substantially parallel to each other and substantially in a vertical orientation 15 in the respective coolant plane 13.
  • the cooling channels 19 and 25 are flowed through either in a first secondary flow direction 26 or in a second secondary flow direction 27, which extend transversely to the two main flow directions 20 and 21.
  • Adeschleit spur 28 as they can provide several cooling channels 19 and 25 in one of the coolant levels 13 of the exhaust gas evaporator 5, here consists of a corrugated sheet 29 with a Glattrippengeomethe 30.
  • thedeffenleit By means of the corrugated sheet 29, thedeffenleit responded 28 structurally particularly easy to provide. It is understood that, depending on how the smooth rib geometry is selected with respect to a rib width 31 and / or rib height 32, the total length of the coolant path 22 and the number of coolant channels 19, 25 can be varied.
  • the rib height 32 in particular determine a coolant channel height and the rib width 31 the coolant channel width, both of which are not explicitly drawn in, since they essentially result from the rib height 32 or the rib width 31.
  • the coolant channels 19, 25 are closed at their end faces 33, 33A (not shown here, but numbered as an example), so that the coolant can only flow via the connection openings 23 from a coolant channel 19 into the further coolant channels 25 until the coolant reaches the coolant plane 13 via an outlet opening 34 of theméstoffleit Anlagen 28 leaves again.
  • connection openings 23 a deflection of the coolant along the coolant path 22 within the coolant plane 13 is achieved.
  • An exhaust gas guide is presently not shown, since it structurally simple consists essentially of rectilinear exhaust ducts whose end faces are not closed, so that hereby the exhaust gases flow into the exhaust ducts and can flow out of the exhaust ducts again.
  • the exhaust gas guide can also be made of a corrugated sheet, but without the above-described connection openings 23. Because a plurality of exhaust gas channels are connected in parallel on the exhaust gas guide device, the exhaust gas guide device is designed to be multi-flow in this embodiment.
  • the coolant channels 19, 25 are connected in series to thedekarleit Korea 28, since the coolant flows through all the coolant channels 19, 25 successively.
  • thedeffenleit responded 28 is constructed in this embodiment einflutig.
  • a separating tray (not shown here) is arranged so as to separate the respective Abgasebe- nen 12 and coolant plane 13, in particular the exhaust channels and the coolant channels 19, 25 spatially from each other.
  • the exhaust gas evaporator 5 in connection with the sandwich design 11 is subjected to a very high degree of strength in a particularly advantageous manner. It is understood that the described exhaust gas evaporator 5 represents only a first embodiment, but is not to be understood as limiting the invention.
  • Fig. 5 shows a formed as a corrugated iron 41 additional disk, which is inserted into a non-illustrated device for exchanging heat according to the present invention.
  • the corrugated sheet 41 has integrally formed partitions 42, 42 a, which flow channels 43, 44, 45, 46, 47, 48, 49, 50 separate from each other.
  • the flow channels 43 and 45 form a first flow path section
  • the flow channels 44 and 46 a second flow path section
  • the flow channels 47 and 49 a third flow path section
  • the flow channels 48 and 50 a fourth flow path section.
  • the first and the third flow path sections are thereby flowed through, for example, onto the viewer, whereas the second and the fourth flow path sections are flowed through by the observer.
  • the first flow path section 43, 45 is connected to the second flow path section 44, 46 via a deflection section formed by a recess 51.
  • the second flow path section 44, 46 is connected to the third flow path section 47, 49 via a deflection section, not shown.
  • the third flow path section 47, 49 is in turn connected to the fourth flow path section 48, 50 via a deflection section formed by a recess 52.
  • the deflecting sections forming gaps between the partitions 42 and a not shown, the flow channels on their side facing the viewer facing side wall of the first flow space, in which the corrugated sheet 51 is arranged.
  • the partition walls 42a are connected to the side wall, so that the flow path portions are flowed through in the order mentioned and alternately in opposite flow directions.
  • a single serpentine meandering flow path through the first flow space is formed, which is formed by a series connection of the flow path sections.
  • an exhaust system with an exhaust gas evaporator, which is connected downstream of an internal combustion engine of a motor vehicle, wherein the exhaust gas evaporator has a sandwich construction, in which exhaust gas levels and coolant planes are arranged alternately directly next to each other, the exhaust gas evaporator preferably abgas textbook a Abgasleit responded and evaporate - Has a ferriterhoffleit observed, which are spatially separated from each other, wherein preferably in each of the coolant planes a plurality of mutually parallel coolant channels are arranged, which are in particular spatially interconnected, wherein the coolant channels are preferably closed at their end faces.
  • a first connection opening to a second coolant channel and at a second partition wall of the first coolant channel to a second end face of the first coolant channel, a second connection opening to a further coolant channel are arranged on a first partition wall of a first coolant channel on a first end side of the first coolant channel, wherein the coolant channels preferably together form a single meandering coolant path through the exhaust gas evaporator and / or are arranged substantially vertically aligned within the exhaust gas evaporator, in particular substantially vertical to a roadway surface, the exhaust gas evaporator preferably having a coolant path and an exhaust gas path, wherein the coolant path track differently oriented in the exhaust gas evaporator is arranged as the exhaust path.
  • coolant channels of a coolant plane are formed by means of a corrugated sheet which is folded several times in the coolant plane and / or the exhaust gas guide device is multi-flow and the coolant guide device is of single-flow design.
  • the object of the invention is also achieved by a method for operating an internal combustion engine of a motor vehicle, in which exhaust gases of the internal combustion engine are conducted by means of an exhaust system in the environment and the exhaust gases before by means of evaporable coolant heat energy is withdrawn, the exhaust gases within an exhaust gas evaporator in a first main flow direction and the coolant are passed through the exhaust gas evaporator in a main flow direction opposite to the first main flow direction, wherein the coolant is passed through the exhaust gas evaporator in sections transverse to the main flow directions.

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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)
  • Exhaust Gas After Treatment (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

L'invention concerne un système d'échappement (3) qui comprend un évaporateur de gaz d'échappement (5) et qui est placé en aval d'un moteur à combustion interne (2) d'un véhicule automobile. Selon l'invention, l'évaporateur de gaz d'échappement (5) présente une structure en sandwich dans laquelle les niveaux de gaz d'échappement (12) et les niveaux de réfrigérant (13) sont placés directement les uns à côté des autres en alternance. On obtient ainsi un évaporateur de gaz d'échappement très compact qui est également très efficace.
EP08870681A 2007-12-13 2008-12-15 Dispositif d'échange de chaleur et véhicule automobile Withdrawn EP2232186A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007060523A DE102007060523A1 (de) 2007-12-13 2007-12-13 Abgasanlage mit einem Abgasverdampfer, Verfahren zum Betreiben einer Brennkraftmaschine eines Kraftfahrzeuges
PCT/EP2008/010662 WO2009089885A1 (fr) 2007-12-13 2008-12-15 Dispositif d'échange de chaleur et véhicule automobile

Publications (1)

Publication Number Publication Date
EP2232186A1 true EP2232186A1 (fr) 2010-09-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08870681A Withdrawn EP2232186A1 (fr) 2007-12-13 2008-12-15 Dispositif d'échange de chaleur et véhicule automobile

Country Status (5)

Country Link
US (1) US20100319887A1 (fr)
EP (1) EP2232186A1 (fr)
JP (1) JP2011511238A (fr)
DE (1) DE102007060523A1 (fr)
WO (1) WO2009089885A1 (fr)

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JP2011511238A (ja) 2011-04-07
WO2009089885A1 (fr) 2009-07-23
DE102007060523A1 (de) 2009-06-18

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