US20120297753A1 - Exhaust system with heat accumulator - Google Patents
Exhaust system with heat accumulator Download PDFInfo
- Publication number
- US20120297753A1 US20120297753A1 US13/458,486 US201213458486A US2012297753A1 US 20120297753 A1 US20120297753 A1 US 20120297753A1 US 201213458486 A US201213458486 A US 201213458486A US 2012297753 A1 US2012297753 A1 US 2012297753A1
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- US
- United States
- Prior art keywords
- heat
- exhaust system
- accumulator housing
- exhaust
- heat accumulator
- 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.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000010457 zeolite Substances 0.000 claims description 19
- 229910021536 Zeolite Inorganic materials 0.000 claims description 18
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 18
- 238000005338 heat storage Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000000306 component Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012080 ambient air Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- 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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
-
- 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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/003—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using thermochemical reactions
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
-
- 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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0004—Particular heat storage apparatus
- F28D2020/0013—Particular heat storage apparatus the heat storage material being enclosed in elements attached to or integral with heat exchange 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust system for a combustion engine.
- Combustion engines e.g. Otto engines or Diesel engines, consume fuels for operation.
- the heat energy can be used for heating the passenger compartment.
- Other approaches involve the use of thermoelectric generators to convert heat energy, contained in the exhaust, into electric energy which, in turn, can be utilized for operation of a motor vehicle.
- the combustion engine which predominantly is made from metallic material is designed in a way as to run efficiently enough at operating temperature.
- the different thermal expansions of engine block, pistons, piston rings, cylinder head, valves and further components are suited to one another in such a way as to realize optimal efficiency at an average operating temperature of the core components at about 90° to 100° C., and at this operating temperature the engine performance is minimized and the charge cycle is optimized.
- automotive fluids of a combustion engine e.g. engine oil, or in downline transmissions, the mechanical components as well as transmission oils are optimized for use at the respective operating temperature.
- an exhaust system for a combustion engine includes an exhaust pipe, a heat accumulator housing in surrounding relationship to the exhaust pipe, and heat pipes arranged in the heat accumulator housing to provide a heat transport of heat energy contained in exhaust gas.
- the present invention resolves prior art problems by arranging a heat accumulator about part of the exhaust system, e.g. about at least a region of an exhaust-carrying pipe of the exhaust tract.
- the heat accumulator can be designed in the form of a heat accumulator housing to completely surround or envelope the exhaust pipe at least in a region thereof in flow direction of the exhaust gas.
- Heat pipes can be integrated in the heat accumulator to establish a connection to a heat sink, advantageously to a component to which heat is intended to be supplied.
- the heat accumulator By arranging the heat accumulator about the exhaust pipe in accordance with the present invention, there is no need to integrate any elements in the exhaust gas tract, i.e. inside the exhaust pipe. Thus, there is no increase in the exhaust-gas back pressure.
- heat energy contained in the exhaust gas can be used to charge the heat accumulator in the absence of any adverse effect on the exhaust gas after-treatment unit or other elements disposed in the exhaust tract.
- the exhaust pipe may be completely surrounded by the heat accumulator housing.
- the heat accumulator housing may be configured in the form of a cladding tube, sized to completely envelope the exhaust pipe at least in a region thereof.
- the heat accumulator housing in particular the heat accumulator located therein, may be made from a zeolite. Dry zeolite removes water vapor from ambient air as a result of its hygroscopic character. The attachment of water molecules to the surface of the zeolite causes the molecule to transform to an energetically lower state. Water vapor thus gives off energy in the form of heat to the zeolite, causing the zeolite in turn to intensely heat up. This heat is then carried away by heat pipes arranged in the heat accumulator housing. The supply of heat energy from the exhaust onto the zeolite, in turn, desorbs water molecules above a certain temperature and the zeolite is returned to its dry initial state.
- a heat storage medium can be provided in the heat accumulator housing, with the heat storage medium being made of a material that includes zeolite.
- the exhaust system according to the present invention can be best suited to the cold-start performance of the combustion engine for which the exhaust system is intended for use.
- active or passive open-loop and closed-loop control of the exhaust system is conceivable by which the exhaust system can be further modified to the respective operating state to be adjusted.
- the heat pipes can be arranged in the zeolite.
- the heat pipes can be completely surrounded by the zeolite.
- the heat pipes are fully enclosed in the heat accumulator housing.
- the heat pipes emerge from the heat accumulator housing only in the connection zone, advantageously an end region of the heat pipes, in order to be able to carry heat out of the heat accumulator housing.
- the heat pipes can be arranged in parallel relationship to an exhaust-gas flow direction. It thus becomes possible to use especially short distances to conduct heat energy removed from the exhaust into the heat pipes and from there to carry it off via fluid located in the heat pipes. Thus, heat energy can be removed from the exhaust over a length of 50, 100 or also 200 mm and transferred by heat conduction through the heat accumulator housing into the heat pipe and carried off from there.
- heat pipes can be arranged within the heat accumulator housing.
- at least five, or more than seven or even more than ten heat pipes can be arranged in the cross section of the exhaust pipe radially circumferentially.
- several of the heat pipes can extend in parallel relationship within the heat accumulator housing and can be united in an end zone of the heat accumulator housing.
- several heat pipes which are small in diameter can be used to prevent the heat accumulator housing from being overdimensioned.
- the use of several small heat pipes in cross section enables enough heat quantity to be carried off from the heat accumulator and supplied to a respective heat sink in the region of the outlet of the heat accumulator housing via at least a central heat conduction in the form of a heat pipe. Overall, this leads to a particularly compact concept of the exhaust system according to the present invention.
- the heat pipes can have an I-shaped configuration.
- the heat pipes are configured to form a closed circuit for circulation of a medium.
- the schematic cross sectional representation then forms a circulation circuit. Respective selection of the respective application is then implemented by considering the field of use to be expected and the heat quantity to be transferred.
- the heat pipes can be integrated in a closed-loop control or open-loop control.
- the heat transport can hereby be controlled and/or regulated by the heat pipe itself.
- valves may be arranged in the heat pipes to regulate and/or control the heat transport within the heat pipe.
- the respective heat transport can be manipulated actively or through intervention of passively actuated valves.
- the heat pipes cause a high heat dissipation, whereas heat dissipation is minimized via the heat pipes, when the operating temperature has been reached so that the heat accumulator can be charged in an optimum manner.
- a thermal insulation can be formed on an outer surface area of the heat accumulator housing.
- the thermal insulation is a metal coating.
- the thermal insulation may also be implemented in the form of a thermal insulating material, air gap insulation and/or in the form of a metallic film coating. In particular, it is possible to provide a reflection of heat energy in the heat accumulator by the surface of the metallic coating back into the heat accumulator. This, too, minimizes dissipation of the heat quantity to the ambient air.
- a valve can be arranged on the heat accumulator housing for controlling a thermodynamic state in the heat accumulator housing.
- the thermodynamic state of a zeolite can be regulated and/or controlled via a controllable and regulatable valve.
- the valve may, for example, be actively opened.
- the valve or an additional valve may be configured as a pressure relief valve for drying the zeolite.
- FIG. 1 is a cross sectional representation of an exhaust system according to the present invention.
- FIG. 2 is a side view of an exhaust system according to the present invention.
- the exhaust system 1 includes an internal exhaust pipe 2 and a heat accumulator housing 3 in surrounding relationship to the exhaust pipe 2 .
- Exhaust gas A flows in the exhaust pipe 2 and carries off heat energy contained in the exhaust pipe 2 by way of heat transfer W into the heat storage medium 4 of the heat accumulator housing 3 .
- Heat pipes 5 are arranged in the heat accumulator housing 3 to absorb heat stored in the heat storage medium 4 and to transport it away.
- the heat accumulator housing 3 is provided with an insulating layer 6 upon an outer surface area 6 .
- FIG. 2 shows a greatly simplified side view of the exhaust system 1 .
- the heat accumulator housing 3 has integrated therein three heat pipes 5 of I-shaped configuration.
- the heat pipes 5 are arranged in parallel relation to the exhaust-gas flow direction S in the heat accumulator housing 3 .
- the heat pipes 5 are united at an end zone 8 of the heat accumulator housing 3 to form a central heat pipe 9 by which heat energy carried away by the heat pipes 5 from the not shown heat accumulator to an unillustrated heat consumer.
- the heat accumulator housing 3 is further provided with a valve 10 for regulating and controlling the thermodynamic state of the heat storage medium 4 . In this way, heat quantity to be carried off via the heat pipes can be regulated and controlled.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
An exhaust system for a combustion engine includes an exhaust pipe, and a heat accumulator housing in surrounding relationship to the exhaust pipe. Arranged in the heat accumulator housing are heat pipes to provide a heat transport of heat energy contained in exhaust gas. Heat energy thus withdrawn from the exhaust gas can be carried off via the heat pipes in the heat accumulator housing.
Description
- This application claims the priority of German Patent Application, Serial No. 10 2011 103 109.3, filed May 25, 2011, pursuant to 35 U.S.C. 119(a)-(d), the content of which is incorporated herein by reference in its entirety as if fully set forth herein.
- The present invention relates to an exhaust system for a combustion engine.
- The following discussion of related art is provided to assist the reader in understanding the advantages of the invention, and is not to be construed as an admission that this related art is prior art to this invention.
- Combustion engines, e.g. Otto engines or Diesel engines, consume fuels for operation. As oil reserves are limited, it is desired to maximize performance of a combustion engine and thus exploitation of energy contained in the fuel. Due to the Carnot process, the efficiency of a combustion engine for converting energy contained in the fuel into mechanical energy is however limited to 40%. In other words, ⅔ of chemical energy bound in fuel is not available for the actual purpose of the combustion engine, i.e. conversion of chemical energy into mechanical energy, but is lost as loss energy. In order to be able to still exploit this energy, especially in the automobile industry, there are many approaches to, for example, recover heat energy or energy bound in the exhaust and to supply it for an appropriate purpose. For example, the heat energy can be used for heating the passenger compartment. Other approaches involve the use of thermoelectric generators to convert heat energy, contained in the exhaust, into electric energy which, in turn, can be utilized for operation of a motor vehicle.
- In order to operate a combustion engine in an optimum efficiency range, optimal operating conditions have to be established. The combustion engine which predominantly is made from metallic material is designed in a way as to run efficiently enough at operating temperature. In other words, the different thermal expansions of engine block, pistons, piston rings, cylinder head, valves and further components are suited to one another in such a way as to realize optimal efficiency at an average operating temperature of the core components at about 90° to 100° C., and at this operating temperature the engine performance is minimized and the charge cycle is optimized. Also automotive fluids of a combustion engine, e.g. engine oil, or in downline transmissions, the mechanical components as well as transmission oils are optimized for use at the respective operating temperature.
- In particular when cold-start phases are involved which take place even at a starting temperature of 20° C., but also at starting temperatures of 0° C. or minus degrees, it is therefore necessary to quickly heat the individual components to operating temperature. Various approaches have been proposed heretofore to recover heat energy of the exhaust gas by withdrawing heat contained in the exhaust and feeding it to the desired site. This requires, however, the use of heat exchangers in the region of the exhaust tract, causing a rise in the exhaust-gas back pressure so that the overall efficiency of the combustion engine is adversely affected.
- The tendency to increasingly minimize exhaust emission and thus accompanying exhaust after-treatment components, e.g. particle filter or catalytic converter, runs counter however to the removal of heat from the exhaust gas during the cold-start phase because the exhaust after-treatment systems require also heat energy to ensure their full effect. Moreover, oftentimes a heat transfer medium, especially water, is used that in turn limits however efficiency and thus results in an inadequate solution.
- It would be desirable and advantageous to provide an improved exhaust system to obviate prior art shortcomings and to allow a targeted heat transport without removing from the exhaust gas excessive amount of heat energy in certain operating situations.
- According to one aspect of the present invention, an exhaust system for a combustion engine includes an exhaust pipe, a heat accumulator housing in surrounding relationship to the exhaust pipe, and heat pipes arranged in the heat accumulator housing to provide a heat transport of heat energy contained in exhaust gas.
- The present invention resolves prior art problems by arranging a heat accumulator about part of the exhaust system, e.g. about at least a region of an exhaust-carrying pipe of the exhaust tract. The heat accumulator can be designed in the form of a heat accumulator housing to completely surround or envelope the exhaust pipe at least in a region thereof in flow direction of the exhaust gas. Heat pipes can be integrated in the heat accumulator to establish a connection to a heat sink, advantageously to a component to which heat is intended to be supplied.
- In particular during cold-start performance, heat from the heat accumulator is used to heat connected components. In other words, no energy is removed from the exhaust gas during the cold-start phase so that the exhaust system according to the present invention can be arranged upstream of an exhaust gas after-treatment unit as well as downstream of an exhaust gas after-treatment unit. The performance of the exhaust gas after-treatment unit is not, or only insignificantly, impacted by an exhaust system according to the present invention.
- By arranging the heat accumulator about the exhaust pipe in accordance with the present invention, there is no need to integrate any elements in the exhaust gas tract, i.e. inside the exhaust pipe. Thus, there is no increase in the exhaust-gas back pressure. When the overall system of the combustion engine has reached its optimum operating temperature, heat energy contained in the exhaust gas can be used to charge the heat accumulator in the absence of any adverse effect on the exhaust gas after-treatment unit or other elements disposed in the exhaust tract.
- According to another advantageous feature of the present invention, the exhaust pipe may be completely surrounded by the heat accumulator housing. The heat accumulator housing may be configured in the form of a cladding tube, sized to completely envelope the exhaust pipe at least in a region thereof.
- According to another advantageous feature of the present invention, the heat accumulator housing, in particular the heat accumulator located therein, may be made from a zeolite. Dry zeolite removes water vapor from ambient air as a result of its hygroscopic character. The attachment of water molecules to the surface of the zeolite causes the molecule to transform to an energetically lower state. Water vapor thus gives off energy in the form of heat to the zeolite, causing the zeolite in turn to intensely heat up. This heat is then carried away by heat pipes arranged in the heat accumulator housing. The supply of heat energy from the exhaust onto the zeolite, in turn, desorbs water molecules above a certain temperature and the zeolite is returned to its dry initial state.
- According to another advantageous feature of the present invention, a heat storage medium can be provided in the heat accumulator housing, with the heat storage medium being made of a material that includes zeolite.
- Through selection of a zeolite material and dimensioning of the heat accumulator housing, the exhaust system according to the present invention can be best suited to the cold-start performance of the combustion engine for which the exhaust system is intended for use. In addition, active or passive open-loop and closed-loop control of the exhaust system is conceivable by which the exhaust system can be further modified to the respective operating state to be adjusted.
- According to another advantageous feature of the present invention, the heat pipes can be arranged in the zeolite. Advantageously, the heat pipes can be completely surrounded by the zeolite. In other words, the heat pipes are fully enclosed in the heat accumulator housing. The heat pipes emerge from the heat accumulator housing only in the connection zone, advantageously an end region of the heat pipes, in order to be able to carry heat out of the heat accumulator housing.
- According to another advantageous feature of the present invention, the heat pipes can be arranged in parallel relationship to an exhaust-gas flow direction. It thus becomes possible to use especially short distances to conduct heat energy removed from the exhaust into the heat pipes and from there to carry it off via fluid located in the heat pipes. Thus, heat energy can be removed from the exhaust over a length of 50, 100 or also 200 mm and transferred by heat conduction through the heat accumulator housing into the heat pipe and carried off from there.
- According to another advantageous feature of the present invention, several of the heat pipes can be arranged within the heat accumulator housing. For example, at least five, or more than seven or even more than ten heat pipes can be arranged in the cross section of the exhaust pipe radially circumferentially.
- According to another advantageous feature of the present invention, several of the heat pipes can extend in parallel relationship within the heat accumulator housing and can be united in an end zone of the heat accumulator housing. As a result, several heat pipes which are small in diameter can be used to prevent the heat accumulator housing from being overdimensioned. The use of several small heat pipes in cross section enables enough heat quantity to be carried off from the heat accumulator and supplied to a respective heat sink in the region of the outlet of the heat accumulator housing via at least a central heat conduction in the form of a heat pipe. Overall, this leads to a particularly compact concept of the exhaust system according to the present invention.
- According to another advantageous feature of the present invention, the heat pipes can have an I-shaped configuration. Advantageously, the heat pipes are configured to form a closed circuit for circulation of a medium. The schematic cross sectional representation then forms a circulation circuit. Respective selection of the respective application is then implemented by considering the field of use to be expected and the heat quantity to be transferred.
- According to another advantageous feature of the present invention, the heat pipes can be integrated in a closed-loop control or open-loop control. The heat transport can hereby be controlled and/or regulated by the heat pipe itself. For example, valves may be arranged in the heat pipes to regulate and/or control the heat transport within the heat pipe. In this way, the respective heat transport can be manipulated actively or through intervention of passively actuated valves. In case of cold-start performance for example, the heat pipes cause a high heat dissipation, whereas heat dissipation is minimized via the heat pipes, when the operating temperature has been reached so that the heat accumulator can be charged in an optimum manner.
- According to another advantageous feature of the present invention, a thermal insulation can be formed on an outer surface area of the heat accumulator housing. Advantageously, the thermal insulation is a metal coating. As a result of thermal insulation on the outer side of the heat accumulator housing, heat dissipation to the ambient air is minimized. This ensures that the heat accumulator is able to optimally charge in the operating behavior and the stored heat quantity can be maintained over a longest possible time period without being wasted through dissipation to the ambient air. The thermal insulation may also be implemented in the form of a thermal insulating material, air gap insulation and/or in the form of a metallic film coating. In particular, it is possible to provide a reflection of heat energy in the heat accumulator by the surface of the metallic coating back into the heat accumulator. This, too, minimizes dissipation of the heat quantity to the ambient air.
- According to another advantageous feature of the present invention, a valve can be arranged on the heat accumulator housing for controlling a thermodynamic state in the heat accumulator housing. Advantageously, the thermodynamic state of a zeolite can be regulated and/or controlled via a controllable and regulatable valve.
- To enrich a zeolite with water molecules, the valve may, for example, be actively opened. The valve or an additional valve may be configured as a pressure relief valve for drying the zeolite.
- Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which:
-
FIG. 1 is a cross sectional representation of an exhaust system according to the present invention; and -
FIG. 2 is a side view of an exhaust system according to the present invention. - Throughout all the figures, same or corresponding elements may generally be indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the figures are not necessarily to scale and that the embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.
- Turning now to the drawing, and in particular to
FIG. 1 , there is shown an exhaust system according to the present invention, generally designated byreference numeral 1. Theexhaust system 1 includes an internal exhaust pipe 2 and aheat accumulator housing 3 in surrounding relationship to the exhaust pipe 2. Exhaust gas A flows in the exhaust pipe 2 and carries off heat energy contained in the exhaust pipe 2 by way of heat transfer W into the heat storage medium 4 of theheat accumulator housing 3. Currently preferred is the use of zeolite as heat storage medium.Heat pipes 5 are arranged in theheat accumulator housing 3 to absorb heat stored in the heat storage medium 4 and to transport it away. Advantageously, theheat accumulator housing 3 is provided with an insulating layer 6 upon an outer surface area 6. -
FIG. 2 shows a greatly simplified side view of theexhaust system 1. Theheat accumulator housing 3 has integrated therein threeheat pipes 5 of I-shaped configuration. Theheat pipes 5 are arranged in parallel relation to the exhaust-gas flow direction S in theheat accumulator housing 3. Theheat pipes 5 are united at an end zone 8 of theheat accumulator housing 3 to form a central heat pipe 9 by which heat energy carried away by theheat pipes 5 from the not shown heat accumulator to an unillustrated heat consumer. Theheat accumulator housing 3 is further provided with avalve 10 for regulating and controlling the thermodynamic state of the heat storage medium 4. In this way, heat quantity to be carried off via the heat pipes can be regulated and controlled. - While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit and scope of the present invention. The embodiments were chosen and described in order to explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.
- What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein:
Claims (17)
1. An exhaust system for a combustion engine, said exhaust system comprising:
an exhaust pipe;
a heat accumulator housing in surrounding relationship to the exhaust pipe; and
heat pipes arranged in the heat accumulator housing to provide a heat transport of heat energy contained in exhaust gas.
2. The exhaust system of claim 1 , wherein the exhaust pipe is completely encircled by the heat accumulator housing.
3. The exhaust system of claim 1 , wherein the heat accumulator housing is made of a zeolite.
4. The exhaust system of claim 1 , wherein the heat accumulator housing contains a heat storage medium.
5. The exhaust system of claim 1 , wherein the heat storage medium is made of a material that includes zeolite.
6. The exhaust system of claim 3 , wherein the heat pipes are arranged in the zeolite.
7. The exhaust system of claim 3 , wherein the heat pipes are completely enclosed by the zeolite.
8. The exhaust system of claim 1 , wherein the heat pipes are arranged in parallel relationship to an exhaust-gas flow direction.
9. The exhaust system of claim 1 , wherein several of the heat pipes extend in parallel relationship within the heat accumulator housing and are united in an end zone of the heat accumulator housing.
10. The exhaust system of claim 1 , wherein the heat pipes have an I-shaped configuration.
11. The exhaust system of claim 1 , wherein the heat pipes are configured to form a closed circuit for circulation of a medium.
12. The exhaust system of claim 1 , wherein the heat pipes are integrated in a open-loop control or closed-loop control.
13. The exhaust system of claim 1 , further comprising a thermal insulation formed on an outer surface area of the heat accumulator housing.
14. The exhaust system of claim 12 , wherein the thermal insulation is a metal coating.
15. The exhaust system of claim 1 , further comprising a valve arranged on the heat accumulator housing for controlling a thermodynamic state in the heat accumulator housing.
16. The exhaust system of claim 15 , wherein the valve is configured as a pressure relief valve.
17. The exhaust system of claim 15 , wherein the valve is integrated in an open-loop control or closed-loop control.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011103109A DE102011103109A1 (en) | 2011-05-25 | 2011-05-25 | Exhaust system with heat storage |
DE102011103109.3 | 2011-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120297753A1 true US20120297753A1 (en) | 2012-11-29 |
Family
ID=47140410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/458,486 Abandoned US20120297753A1 (en) | 2011-05-25 | 2012-04-27 | Exhaust system with heat accumulator |
Country Status (2)
Country | Link |
---|---|
US (1) | US20120297753A1 (en) |
DE (1) | DE102011103109A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112352134A (en) * | 2018-07-11 | 2021-02-09 | 林德有限责任公司 | Temperature compensation element, pipe and method for producing a pipe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITBO20120626A1 (en) * | 2012-11-15 | 2014-05-16 | Magneti Marelli Spa | HEAT EXCHANGER WITH THERMAL ENERGY RECOVERY FOR AN INTERNAL COMBUSTION ENGINE EXHAUST SYSTEM |
DE102019202382B4 (en) * | 2019-02-21 | 2022-02-24 | Audi Ag | Cladding element for the thermal insulation of a component, component arrangement and method for operating a component arrangement |
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US4107922A (en) * | 1972-09-04 | 1978-08-22 | Robert Bosch Gmbh | Equipment for exhaust gas detoxification in internal combustion engines |
US4991644A (en) * | 1989-07-12 | 1991-02-12 | Tufts University | Engine preheating process and system |
US5943859A (en) * | 1997-09-18 | 1999-08-31 | Isuzu Ceramics Research Institute Co., Ltd. | Natural gas reforming apparatus, oxygen eliminating apparatus provided in the same apparatus, and natural gas reforming apparatus-carrying gas engine |
US7444803B2 (en) * | 2004-12-15 | 2008-11-04 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas control apparatus for engine and method for producing same |
US20090038302A1 (en) * | 2006-03-16 | 2009-02-12 | Takeshi Yamada | Exhaust gas heat recovery device |
US20090049832A1 (en) * | 2005-02-23 | 2009-02-26 | Shuichi Hase | Exhaust heat recovery device |
US20090236435A1 (en) * | 2008-03-19 | 2009-09-24 | Honda Motor Co., Ltd. | Warming-up system for vehicle |
US20120288774A1 (en) * | 2007-03-30 | 2012-11-15 | Amminex A/S | System for storing ammonia in and releasing ammonia from a storage material and method for storing and releasing ammonia |
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DE3504718C2 (en) * | 1985-02-12 | 1987-04-30 | Fritz Dipl.-Ing. Kaubek | Device and method for preheating parts of an internal combustion engine |
DE102009034655A1 (en) * | 2009-07-24 | 2011-01-27 | J. Eberspächer GmbH & Co. KG | Latent heat storage |
DE102009049196A1 (en) | 2009-10-13 | 2010-05-20 | Daimler Ag | Vehicle is provided with heat source, heat sink and heat pipes which are connected with heat source, heat sink and control element |
-
2011
- 2011-05-25 DE DE102011103109A patent/DE102011103109A1/en not_active Ceased
-
2012
- 2012-04-27 US US13/458,486 patent/US20120297753A1/en not_active Abandoned
Patent Citations (8)
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US4107922A (en) * | 1972-09-04 | 1978-08-22 | Robert Bosch Gmbh | Equipment for exhaust gas detoxification in internal combustion engines |
US4991644A (en) * | 1989-07-12 | 1991-02-12 | Tufts University | Engine preheating process and system |
US5943859A (en) * | 1997-09-18 | 1999-08-31 | Isuzu Ceramics Research Institute Co., Ltd. | Natural gas reforming apparatus, oxygen eliminating apparatus provided in the same apparatus, and natural gas reforming apparatus-carrying gas engine |
US7444803B2 (en) * | 2004-12-15 | 2008-11-04 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas control apparatus for engine and method for producing same |
US20090049832A1 (en) * | 2005-02-23 | 2009-02-26 | Shuichi Hase | Exhaust heat recovery device |
US20090038302A1 (en) * | 2006-03-16 | 2009-02-12 | Takeshi Yamada | Exhaust gas heat recovery device |
US20120288774A1 (en) * | 2007-03-30 | 2012-11-15 | Amminex A/S | System for storing ammonia in and releasing ammonia from a storage material and method for storing and releasing ammonia |
US20090236435A1 (en) * | 2008-03-19 | 2009-09-24 | Honda Motor Co., Ltd. | Warming-up system for vehicle |
Cited By (1)
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CN112352134A (en) * | 2018-07-11 | 2021-02-09 | 林德有限责任公司 | Temperature compensation element, pipe and method for producing a pipe |
Also Published As
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DE102011103109A1 (en) | 2012-11-29 |
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