WO1998000301A1 - Heat energy extracting device - Google Patents

Heat energy extracting device Download PDF

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Publication number
WO1998000301A1
WO1998000301A1 PCT/SE1997/001174 SE9701174W WO9800301A1 WO 1998000301 A1 WO1998000301 A1 WO 1998000301A1 SE 9701174 W SE9701174 W SE 9701174W WO 9800301 A1 WO9800301 A1 WO 9800301A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gases
unit
members
heat transfer
conducting
Prior art date
Application number
PCT/SE1997/001174
Other languages
French (fr)
Inventor
Bengt Bodin
Matt Miskimin
Original Assignee
Mobitec Ab
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
Priority claimed from SE9602561A external-priority patent/SE9602561D0/en
Application filed by Mobitec Ab filed Critical Mobitec Ab
Priority to AU35639/97A priority Critical patent/AU3563997A/en
Publication of WO1998000301A1 publication Critical patent/WO1998000301A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/14—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit
    • B60H1/18—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit the air being heated from the plant exhaust gases
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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 a device for extracting heat energy from the exhaust gases from the engine in a motor vehicle according to the preamble of the appended claim 1.
  • Such a device, through which the heat energy of the exhaust gases is utilized for heating the cabin of a private car is already known in different embodiments.
  • these different embodiments have a drawback in common, namely that they make the exhaust gas system with a device comprised therein for extracting heat energy from the exhaust gases to a larger or smaller extent more complicated and thereby more expensive than otherwise. This is due to the fact that the device in question has required a lot of extra-arrangements and was not possible to incorporate into the exhaust gas system in a satisfactory manner.
  • the object of the present invention is to provide a device of the type defined in the introduction, which to a large extent reduces the drawback mentioned above of such devices already known.
  • This object is according to the invention obtained by providing a device according to the appended claim 1. Thanks to the inventional idea to make said unit not only to function as heat exchanger but also as noise suppresser, it is only necessary to modify the noise suppressing unit, which in any case has to be a part of the exhaust gas system of the mo- tor vehicle, in such a way that it functions as heat exchanger. It has turned out that this may be obtained by comparatively simple means, so that the additional cost for providing a motor vehicle with the device according to the invention will be comparatively modest.
  • the invention is based upon the understanding that it could be possible to satisfy the need of heat exchange and noise suppressing through one and the same unit, and it has in the practice also turned out that this is completely possible.
  • the unit comprises a casing arranged in the path of said exhaust gases between the engine and the outlet end of the exhaust pipe, said casing being designed to delimit a room having inlets and outlets for the exhaust gases and the medium and in which heat exchange therebetween as well as said noise suppressing are intended to take place.
  • the heat exchanging function may in this way be placed in a casing which in any way would be present in the exhaust gas system for accommodating a noise suppresser, wherein it however possibly may be necessary to carry out certain modifications of such a casing.
  • the device comprises an arrangement adapted to utilize the heat absorbed by said medium from the exhaust gases for heating a space in a motor vehicle. It is very advantageous from the energy saving point of view to utilize a noise suppresser so as to heat a space of a motor vehicle, such as the cabin of a bus.
  • the device comprises means for conducting said medium along said members having said heat transfer surfaces on the opposite side thereof with respect to the exhaust gases and in counter- current with respect thereto. Thanks to such a counter-current flow of said medium over the heat transfer surfaces for extract- ing heat from the hot exhaust gases an efficient energy extraction from the exhaust gases and thereby a high thermal efficiency of the device is obtained.
  • said device comprises an arrangement arranged in the unit for catalytic conversion of impurity constituents of the exhaust gases passing through the unit. Thanks to the arrangement of such a catalytic converter inside the very unit three functions are enabled, namely heating a space of the vehicle, catalytic conversion of harmful substances and noise suppressing, though one and the same unit, which simplifies the arrangement of said unit in a motor vehicle and acts cost reducing.
  • said members are arranged inside the unit in the path of the exhaust gases downstream of the arrangement for catalytic conversion, which is important for keeping harmful discharges through the exhaust gas system of the vehicle at a low, acceptable level.
  • the device comprises a means arranged in the unit and designed to supply fuel to the exhaust gases in their way upstream of the arrangement for catalytic conversion for raising the temperature of the exhaust gases there.
  • a means arranged in the unit and designed to supply fuel to the exhaust gases in their way upstream of the arrangement for catalytic conversion for raising the temperature of the exhaust gases there.
  • the mutual distance and orientation of the members having heat transfer surfaces are selected so as to obtain noise extinguishing interferences of the pulsating exhaust gas flow.
  • Said members having heat transfer surfaces are in this way efficiently utilized for obtaining a good suppressing of the noise emanating from the pulsating exhaust gas flow.
  • the mutual distance and orientation of said members having heat transfer surfaces are selected so that the members define a labyrinth-like path for the exhaust gases for smoothing out and reducing the discharge velocity thereof through the outlet end of the exhaust pipe.
  • Such a structure achieved through said members is advantageous for obtaining a good noise suppression, but it also results in the advantage that the heat transfer capacity will get very high when exhaust gases are conducted in such a way through the labyrinth-like structure.
  • the members comprise flanges having heat transfer surfaces and being designed to cause a suppression of noise deriving from the exhaust gas flow, which leads to an excellent result with re- spect to heat exchange and noise suppression.
  • Fig 1 is a schematical perspective view of a combined exhaust gas and air-conditioning system of a vehicle in the form of a bus, in which the device according to the invention is introduced into this system and parts thereof which in reality hide this system have been made transparent, and
  • Fig 2 is a very simplified perspective view of a combined heat exchange and noise suppressing unit of the device illustrated in Fig 1.
  • a device is arranged in a motor vehicle 1 in the form a bus so as to obtain heating of the cabin of the bus and suppressing noise deriving from the exhaust gases from the engine of the bus.
  • the bus has an engine schematically illustrated at 2, from which a conduit 3 with exhaust gases deriving from the engine runs to a casing 5, which is adapted to restrict a room with inlet 6 and outlet 7 for the exhaust gases.
  • the exhaust gases are from the outlet 7 led through an exhaust gas pipe 8 out in the atmosphere.
  • the hot exhaust gases are inside the casing 5 firstly led through a catalytic converter 4 for converting harmful constituents of the exhaust gases.
  • a conducting means 9 is connected to the casing 5 for conducting air from the cabin of the bus, - to which also a portion of fresh air is added, since the air heated later on is intended for the bus cabin, - to an air inlet 10 and to mem- bers 11 having surfaces for heat transfer between this air and the hot flue gases entering the casing, said members being schematically indicated with dashed lines describing the path of the air inside the casing.
  • the members 1 1 restrict through walls having heat transfer surfaces turned outwardly a channel for conducting air through the casing to an air outlet 12 while carrying out a heat exchange with the exhaust gases.
  • the air is led in counter-current mode with respect to the exhaust gases, which has turned out to give a maximum of thermal efficiency, i.e. it enables the largest possible energy extraction per time unit from the exhaust gases.
  • the exhaust gases are conducted along and past the heat transfer surfaces after passing through the catalytic converter 4.
  • the members 1 1 are arranged with such a mutual distance and such an orientation that interferences extinguishing noise are obtained in the pulsating exhaust gas flow deriving from the engine. They are then preferably also so arranged that they have a labyrinth-like structure, through which the exhaust gases have to pass, so that the discharge velocity thereof through the exhaust pipe will also be smoothed out and reduced, which also has a noise suppressing effect.
  • the air heated through the heat exchange in the casing 5 is led through a conducting means 13 to an air-conditioning arrangement 14 of conventional type, which ensures a supply of air having a desired temperature at a number of different locations 15 to the cabin 16 of the bus through a filtration system not shown.
  • a gas sensor 19 is arranged at an arbitrary location in the conducting means 13 for detecting the composition of the air conveyed through the conducting means 13 and emit warning signals, close any valve or the like should pollutions emanating from the exhaust gases, such as compounds having a carbon and/or nitrogen content, be present at too high concentrations in that air. This would indicate a leakage from the exhaust gas system to the ventilating system at the heat exchange inside the unit 17. The passengers' safety in this respect is guaranteed through this sensor.
  • Means 18 arranged for supply of fuel to the exhaust gases in the path thereof up-stream of the catalytic converter 4 are also arranged in the unit for raising the temperature of the exhaust gases there. This gives rise to an extra energy addition to the exhaust gases and makes it possible to extract more power from the unit for heating purposes. This is advantageous when the cabin of the vehicle is heated from a low temperature so as to shorten the time required for obtaining the desired tempera- ture in the cabin, and it also becomes easier to keep the temperature in the cabin at a desired level at extremely low outdoor temperatures.
  • a device of the type according to the invention may easily be brought to heat a bus cabin from -20°C to +20°C in about 10 minutes and keep the temperature at +20°C at an outdoor temperature of -20°C through the energy it is able to extract from the exhaust gases produced during idling of the engine.
  • the unit 17 delimited by the casing 5 takes care of heat exchange with the exhaust gases for heating the motor vehicle cabin, catalytic conversion of harmful substances in the exhaust gases as well as suppressing of noises deriving from the pulsation of the exhaust gases, and the members providing heat transfer surfaces for said heat exchange are more exactly utilized for fulfilling said noise suppressing function.
  • the heat energy extracted from the exhaust gases could also be used for another task than heating a cabin in a motor vehicle.
  • the motor vehicle could be of any conceivable type, such as a bus, a private car, a lorry etc.
  • the heat transfer medium could be conducted in another way, especially in another direction through the casing.
  • Particular channel members could be arranged for conducting the exhaust gases in the casing close to the heat transfer surfaces, not at least for keeping the casing wall insulated from and protected against the hot exhaust gases and avoid an exaggerated heating of this wall.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

A device for extracting heat energy from the exhaust gases from an engine in a motor vehicle comprises a unit (17) through which said exhaust gases are intended to be led and which has members with surfaces for heat transfer from the hot exhaust gases to another medium intended to be led through said unit. Said unit is also adapted to cause suppressing of noise deriving from the exhaust gas flow therethrough. It is also advantageous to have an arrangement (4) for catalytic conversion incorporated as a part of the unit.

Description

HEAT ENERGY EXTRACTING DEVICE
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a device for extracting heat energy from the exhaust gases from the engine in a motor vehicle according to the preamble of the appended claim 1.
Such a device, through which the heat energy of the exhaust gases is utilized for heating the cabin of a private car is already known in different embodiments. However, these different embodiments have a drawback in common, namely that they make the exhaust gas system with a device comprised therein for extracting heat energy from the exhaust gases to a larger or smaller extent more complicated and thereby more expensive than otherwise. This is due to the fact that the device in question has required a lot of extra-arrangements and was not possible to incorporate into the exhaust gas system in a satisfactory manner.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device of the type defined in the introduction, which to a large extent reduces the drawback mentioned above of such devices already known.
This object is according to the invention obtained by providing a device according to the appended claim 1. Thanks to the inventional idea to make said unit not only to function as heat exchanger but also as noise suppresser, it is only necessary to modify the noise suppressing unit, which in any case has to be a part of the exhaust gas system of the mo- tor vehicle, in such a way that it functions as heat exchanger. It has turned out that this may be obtained by comparatively simple means, so that the additional cost for providing a motor vehicle with the device according to the invention will be comparatively modest. Thus, the invention is based upon the understanding that it could be possible to satisfy the need of heat exchange and noise suppressing through one and the same unit, and it has in the practice also turned out that this is completely possible.
According to a preferred embodiment of the invention the unit comprises a casing arranged in the path of said exhaust gases between the engine and the outlet end of the exhaust pipe, said casing being designed to delimit a room having inlets and outlets for the exhaust gases and the medium and in which heat exchange therebetween as well as said noise suppressing are intended to take place. The heat exchanging function may in this way be placed in a casing which in any way would be present in the exhaust gas system for accommodating a noise suppresser, wherein it however possibly may be necessary to carry out certain modifications of such a casing.
According to another preferred embodiment of the invention the device comprises an arrangement adapted to utilize the heat absorbed by said medium from the exhaust gases for heating a space in a motor vehicle. It is very advantageous from the energy saving point of view to utilize a noise suppresser so as to heat a space of a motor vehicle, such as the cabin of a bus.
According to another preferred embodiment of the invention the device comprises means for conducting said medium along said members having said heat transfer surfaces on the opposite side thereof with respect to the exhaust gases and in counter- current with respect thereto. Thanks to such a counter-current flow of said medium over the heat transfer surfaces for extract- ing heat from the hot exhaust gases an efficient energy extraction from the exhaust gases and thereby a high thermal efficiency of the device is obtained.
According to another preferred embodiment of the invention said device comprises an arrangement arranged in the unit for catalytic conversion of impurity constituents of the exhaust gases passing through the unit. Thanks to the arrangement of such a catalytic converter inside the very unit three functions are enabled, namely heating a space of the vehicle, catalytic conversion of harmful substances and noise suppressing, though one and the same unit, which simplifies the arrangement of said unit in a motor vehicle and acts cost reducing.
According to another preferred embodiment of the invention said members are arranged inside the unit in the path of the exhaust gases downstream of the arrangement for catalytic conversion, which is important for keeping harmful discharges through the exhaust gas system of the vehicle at a low, acceptable level.
According to another preferred embodiment of the invention the device comprises a means arranged in the unit and designed to supply fuel to the exhaust gases in their way upstream of the arrangement for catalytic conversion for raising the temperature of the exhaust gases there. Through the existence of such a means, it will be possible to increase the efficiency of the catalytic conversion, but primarily when necessary to make it possible to absorb an increased amount of heat per time unit from the unit for for example heating the cabin of a bus. According to another preferred embodiment of the invention the unit has means for suppressing noise deriving from the exhaust gas flow, and said members with heat transfer surfaces are arranged to have a noise suppressing function and thus at least form a part of said noise suppressing means. In order to simplify and save costs and space it is very advantageous to utilize members having heat transfer surfaces in this way as means for obtaining a suppression of the noises deriving from the exhaust gas flow.
According to another preferred embodiment of the invention, which is a further development of the embodiment last mentioned, the mutual distance and orientation of the members having heat transfer surfaces are selected so as to obtain noise extinguishing interferences of the pulsating exhaust gas flow. Said members having heat transfer surfaces are in this way efficiently utilized for obtaining a good suppressing of the noise emanating from the pulsating exhaust gas flow.
According to another preferred embodiment of the invention the mutual distance and orientation of said members having heat transfer surfaces are selected so that the members define a labyrinth-like path for the exhaust gases for smoothing out and reducing the discharge velocity thereof through the outlet end of the exhaust pipe. Such a structure achieved through said members is advantageous for obtaining a good noise suppression, but it also results in the advantage that the heat transfer capacity will get very high when exhaust gases are conducted in such a way through the labyrinth-like structure.
According to another preferred embodiment of the invention the members comprise flanges having heat transfer surfaces and being designed to cause a suppression of noise deriving from the exhaust gas flow, which leads to an excellent result with re- spect to heat exchange and noise suppression. Further advantages and preferred features of the invention appear from the following description and the other dependent claims.
BRIEF DESCRIPTION OF THE DRAWING
With reference to the appended drawing, below follows a specific description of a preferred embodiment of the invention cited as an example.
In the drawing:
Fig 1 is a schematical perspective view of a combined exhaust gas and air-conditioning system of a vehicle in the form of a bus, in which the device according to the invention is introduced into this system and parts thereof which in reality hide this system have been made transparent, and
Fig 2 is a very simplified perspective view of a combined heat exchange and noise suppressing unit of the device illustrated in Fig 1.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
It is illustrated in Fig 1 how a device according to a preferred embodiment of the invention is arranged in a motor vehicle 1 in the form a bus so as to obtain heating of the cabin of the bus and suppressing noise deriving from the exhaust gases from the engine of the bus. The bus has an engine schematically illustrated at 2, from which a conduit 3 with exhaust gases deriving from the engine runs to a casing 5, which is adapted to restrict a room with inlet 6 and outlet 7 for the exhaust gases. The exhaust gases are from the outlet 7 led through an exhaust gas pipe 8 out in the atmosphere.
The hot exhaust gases are inside the casing 5 firstly led through a catalytic converter 4 for converting harmful constituents of the exhaust gases. A conducting means 9 is connected to the casing 5 for conducting air from the cabin of the bus, - to which also a portion of fresh air is added, since the air heated later on is intended for the bus cabin, - to an air inlet 10 and to mem- bers 11 having surfaces for heat transfer between this air and the hot flue gases entering the casing, said members being schematically indicated with dashed lines describing the path of the air inside the casing. Thus, the members 1 1 restrict through walls having heat transfer surfaces turned outwardly a channel for conducting air through the casing to an air outlet 12 while carrying out a heat exchange with the exhaust gases. The air is led in counter-current mode with respect to the exhaust gases, which has turned out to give a maximum of thermal efficiency, i.e. it enables the largest possible energy extraction per time unit from the exhaust gases. The exhaust gases are conducted along and past the heat transfer surfaces after passing through the catalytic converter 4. The members 1 1 are arranged with such a mutual distance and such an orientation that interferences extinguishing noise are obtained in the pulsating exhaust gas flow deriving from the engine. They are then preferably also so arranged that they have a labyrinth-like structure, through which the exhaust gases have to pass, so that the discharge velocity thereof through the exhaust pipe will also be smoothed out and reduced, which also has a noise suppressing effect.
The air heated through the heat exchange in the casing 5 is led through a conducting means 13 to an air-conditioning arrangement 14 of conventional type, which ensures a supply of air having a desired temperature at a number of different locations 15 to the cabin 16 of the bus through a filtration system not shown. A gas sensor 19 is arranged at an arbitrary location in the conducting means 13 for detecting the composition of the air conveyed through the conducting means 13 and emit warning signals, close any valve or the like should pollutions emanating from the exhaust gases, such as compounds having a carbon and/or nitrogen content, be present at too high concentrations in that air. This would indicate a leakage from the exhaust gas system to the ventilating system at the heat exchange inside the unit 17. The passengers' safety in this respect is guaranteed through this sensor.
Means 18 arranged for supply of fuel to the exhaust gases in the path thereof up-stream of the catalytic converter 4 are also arranged in the unit for raising the temperature of the exhaust gases there. This gives rise to an extra energy addition to the exhaust gases and makes it possible to extract more power from the unit for heating purposes. This is advantageous when the cabin of the vehicle is heated from a low temperature so as to shorten the time required for obtaining the desired tempera- ture in the cabin, and it also becomes easier to keep the temperature in the cabin at a desired level at extremely low outdoor temperatures.
It has turned out that a device of the type according to the invention may easily be brought to heat a bus cabin from -20°C to +20°C in about 10 minutes and keep the temperature at +20°C at an outdoor temperature of -20°C through the energy it is able to extract from the exhaust gases produced during idling of the engine.
Thus, the unit 17 delimited by the casing 5 takes care of heat exchange with the exhaust gases for heating the motor vehicle cabin, catalytic conversion of harmful substances in the exhaust gases as well as suppressing of noises deriving from the pulsation of the exhaust gases, and the members providing heat transfer surfaces for said heat exchange are more exactly utilized for fulfilling said noise suppressing function.
The invention is not in any way restricted to the preferred embodiments described above, but many possibilities to modifications thereof will be apparent to a man skilled in the art without departing from the basic idea of the invention.
It would of course be possible to use another heat transfer medium than air, although it is of course in most cases most practical to use air.
Furthermore, the heat energy extracted from the exhaust gases could also be used for another task than heating a cabin in a motor vehicle.
The motor vehicle could be of any conceivable type, such as a bus, a private car, a lorry etc.
The heat transfer medium could be conducted in another way, especially in another direction through the casing.
Particular channel members could be arranged for conducting the exhaust gases in the casing close to the heat transfer surfaces, not at least for keeping the casing wall insulated from and protected against the hot exhaust gases and avoid an exaggerated heating of this wall.
It would of course also be possible to ensure suppressing of noise through an arrangement of different types of conducting members, such as guide flanges or the like in the casing, which are not intended to enter into any contact with any medium for heat transfer from the exhaust gases to this medium.

Claims

Claims
1. A device for extracting heat energy from the exhaust gases from an engine in a motor vehicle, which comprises a unit (17) through which said exhaust gases are intended to be led and which has members (1 1 ) with surfaces for heat transfer from the hot exhaust gases to another medium intended to be led through said unit, characterized in that said unit is also adapted to cause suppressing of noise deriving from the exhaust gas flow therethrough.
2. A device according to claim 1 , characterized in that said unit (17) comprises a casing (5) arranged in the path of said exhaust gases between the engine and the outlet end of the exhaust pipe, said casing being designed to delimit a room having inlets and outlets (6, 7, 10, 12) for the exhaust gases and the medium and in which heat exchange therebetween as well as said noise suppressing are intended to take place.
3. A device according to claim 1 or 2, characterized in that it comprises an arrangement (13-15) adapted to utilize the heat absorbed from the exhaust gases by said medium for heating a space (16) in the motor vehicle.
4. A device according to claim 3, characterized in that it comprises means (13) for conducting the medium heated in said unit from an outlet (12) of the unit to said arrangement for heating the cabin of the motor vehicle.
5. A device according to any of claims 1-4, characterized in that it comprises means (9, 11 ) for conducting air as said medium.
6. A device according to claims 4 and 5, characterized in that the conducting means (13) is adapted to conduct the heated air to an air-conditioning arrangement (14) included in the device.
7. A device according to any of claims 1-6, characterized in that it comprises means (9, 1 1 ) for conducting said medium along said members (11 ) having heat exchange surfaces on the opposite side thereof with respect to the exhaust gases and in counter-current with respect thereto.
8. A device according to any of claims 1-7, characterized in that it comprises means (9, 1 1 ) for conducting said medium through a channel delimited by walls having said heat transfer surfaces, and that it has means (5, 11 ) for conducting said ex- haust gases outside said heat transfer surfaces.
9. A device according to any of claims 1-8, characterized in that it comprises an arrangement (4) for catalytic conversion of impurity constituents of the exhaust gases passing through the unit.
10. A device according to claim 9, characterized in that said members (1 1 ) are arranged inside the unit in the path of said exhaust gases downstream of the arrangement (4) for catalytic conversion.
1 1. A device according to claim 9 or 10, characterized in that it comprises a means (18) arranged in said unit and adapted to supply fuel to the exhaust gases in the path thereof up-stream of the arrangement for catalytic conversion for increasing the temperature of the exhaust gases there.
12. A device according to any of claims 1-1 1 , characterized in that it comprises means (9) arranged to conduct air from a space (16) of the motor vehicle to an inlet (10) of said unit for heating thereof.
13. A device according to claim 12, characterized in that said conducting means (9) is adapted to conduct the air from the cabin (16) of the motor vehicle to said unit (17).
14. A device according to any of claims 1-13, characterized in that said unit has means (11 ) for suppressing noises deriving from the exhaust gas flow.
15. A device according to claim 14, characterized in that said members (11 ) having heat transfer surfaces are adapted to have a noise suppressing function and accordingly at least form a part of said means for suppressing noise.
16. A device according to claim 15, characterized in that the mutual distance and orientation of said members (11 ) are selected so as to obtain interferences in the pulsating exhaust gas flow extinguishing noise.
17. A device according to claim 15 or 16, characterized in that the mutual distance and the orientation of said members (1 1 ) having heat transfer surfaces are selected so that the members define a labyrinth-like path for the exhaust gases for smoothing out and reducing the discharge velocity thereof through the outlet end of the exhaust pipe.
18. A device according any of claims 15-17, characterized in that said members (11 ) comprise flanges having heat transfer surfaces and being designed to cause a suppression of noises emanating from the exhaust gas flow.
PCT/SE1997/001174 1996-06-28 1997-06-30 Heat energy extracting device WO1998000301A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35639/97A AU3563997A (en) 1996-06-28 1997-06-30 Heat energy extracting device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9602561-4 1996-06-28
SE9602561A SE9602561D0 (en) 1996-06-28 1996-06-28 Thermal energy recovery device
SE9603740-3 1996-10-14
SE9603740A SE9603740L (en) 1996-06-28 1996-10-14 Thermal energy recovery device

Publications (1)

Publication Number Publication Date
WO1998000301A1 true WO1998000301A1 (en) 1998-01-08

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ID=26662693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001174 WO1998000301A1 (en) 1996-06-28 1997-06-30 Heat energy extracting device

Country Status (3)

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AU (1) AU3563997A (en)
SE (1) SE9603740L (en)
WO (1) WO1998000301A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103832241A (en) * 2013-12-19 2014-06-04 柳州市京阳节能科技研发有限公司 Efficient energy-saving environment-friendly vehicle radiator
DE102016009180A1 (en) * 2016-07-29 2018-02-01 Volkswagen Aktiengesellschaft Exhaust gas condenser assembly of a motor vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053441A (en) *
DE548940C (en) * 1928-11-20 1932-11-03 Winkelstraeter & Sure Fresh air heater for motor vehicles
DE19537800A1 (en) * 1994-10-21 1996-04-25 Volkswagen Ag Exhaust gas system with heat exchanger
WO1996027734A1 (en) * 1995-03-07 1996-09-12 Schatz Thermo Gastech Gmbh Arrangement for reducing exhaust gas emissions from an internal combustion engine with an exhaust gas catalytic converter
WO1996032572A1 (en) * 1995-04-11 1996-10-17 Vølund Danstoker A/S A combined heat exchanger and silencer apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053441A (en) *
DE548940C (en) * 1928-11-20 1932-11-03 Winkelstraeter & Sure Fresh air heater for motor vehicles
DE19537800A1 (en) * 1994-10-21 1996-04-25 Volkswagen Ag Exhaust gas system with heat exchanger
WO1996027734A1 (en) * 1995-03-07 1996-09-12 Schatz Thermo Gastech Gmbh Arrangement for reducing exhaust gas emissions from an internal combustion engine with an exhaust gas catalytic converter
WO1996032572A1 (en) * 1995-04-11 1996-10-17 Vølund Danstoker A/S A combined heat exchanger and silencer apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103832241A (en) * 2013-12-19 2014-06-04 柳州市京阳节能科技研发有限公司 Efficient energy-saving environment-friendly vehicle radiator
DE102016009180A1 (en) * 2016-07-29 2018-02-01 Volkswagen Aktiengesellschaft Exhaust gas condenser assembly of a motor vehicle

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SE9603740L (en) 1997-12-29
AU3563997A (en) 1998-01-21
SE9603740D0 (en) 1996-10-14

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