JP2009085077A - Heat recovery device for internal combustion engine - Google Patents

Abstract

An object of the present invention is to provide a heat recovery and utilization device for an internal combustion engine that can achieve good intake air heating by heat recovered from other than exhaust loss.
Refrigerant chambers 9, 10, 11 are provided adjacent to a combustion chamber 2 via a partition wall, and at least a part of the refrigerant in the refrigerant chamber undergoes a phase change from a liquid phase to a gas phase during an expansion stroke, and intake air During the process, the phase changes from the gas phase to the liquid phase.
[Selection] Figure 1

Description

  The present invention relates to a heat recovery and utilization device for an internal combustion engine.

  In an internal combustion engine, various losses are generated from the generated combustion energy. Among these losses, it has been proposed to use the heat of exhaust loss for intake air heating (see, for example, Patent Document 1).

JP-A-2005-133609

  However, the heat of the exhaust gas is generally used to warm up the catalyst device of the engine exhaust system and maintain it at the catalyst activation temperature. When the heat of the exhaust gas is used for intake air heating, the catalyst device The warming up of the catalyst and the maintenance of the catalyst device at the catalyst activation temperature become insufficient.

  Accordingly, an object of the present invention is to provide a heat recovery and utilization device for an internal combustion engine that can realize intake air heating with heat recovered from other than exhaust loss.

  According to a first aspect of the present invention, there is provided an internal combustion engine heat recovery and utilization device comprising a refrigerant chamber adjacent to a combustion chamber via a partition wall, wherein at least a part of the refrigerant in the refrigerant chamber is in a liquid phase during an expansion stroke. Phase change from gas phase to gas phase and phase change from gas phase to liquid phase during the intake stroke.

  According to a second aspect of the present invention, there is provided the heat recovery and utilization device for an internal combustion engine according to the first aspect, wherein the internal combustion engine is a multi-cylinder internal combustion engine, The refrigerant chamber is provided independently for each cylinder.

  According to a third aspect of the present invention, there is provided the internal combustion engine heat recovery and utilization apparatus according to the second aspect, wherein the refrigerant chamber for each cylinder is independently provided with a gas-phase refrigerant pressure. An adjusting device is provided.

  According to a fourth aspect of the present invention, there is provided a heat recovery and utilization device for an internal combustion engine according to the third aspect of the present invention. The pressure of the gas-phase refrigerant in the refrigerant chamber of one cylinder is increased.

  The internal combustion engine heat recovery and utilization device according to claim 5 of the present invention is the internal combustion engine heat recovery and utilization device according to claim 3 or 4, wherein the pressure of the gas phase refrigerant in the refrigerant chamber of the cylinder in which knocking has occurred. Is reduced by the pressure adjusting device as compared with the pressure of the gas-phase refrigerant in the refrigerant chamber of the cylinder in which knocking has not occurred.

  An internal combustion engine heat recovery and utilization device according to a sixth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to fifth aspects, wherein the internal combustion engine is a compression auto-ignition engine. It is characterized by that.

  An internal combustion engine heat recovery and utilization device according to a seventh aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to fifth aspects, wherein the fuel of the internal combustion engine is at least methanol or It contains alcohol.

  An internal combustion engine heat recovery and utilization device according to an eighth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to seventh aspects, wherein the refrigerant chamber radiates heat to the atmosphere. It has the heat insulation layer for suppressing, It is characterized by the above-mentioned.

  An internal combustion engine heat recovery and utilization device according to a ninth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to eighth aspects, wherein the internal combustion engine heat recovery and utilization device is adjacent to an upper unit area of the combustion chamber. The volume of the refrigerant chamber is larger than the volume of the refrigerant chamber adjacent to the unit area below the combustion chamber.

  An internal combustion engine heat recovery and utilization device according to a tenth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to ninth aspects, wherein the partition protrudes into the refrigerant chamber. A heat exchange fin is formed.

  An internal combustion engine heat recovery and utilization device according to an eleventh aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to ninth aspects, wherein the partition protrudes into the refrigerant chamber. Reinforcing ribs are formed.

  An internal combustion engine heat recovery and utilization apparatus according to a twelfth aspect of the present invention is the internal combustion engine heat recovery and utilization apparatus according to any one of the first to eleventh aspects, wherein the refrigerant chamber has a combustion chamber in a vertical direction. An extended heat transfer member is provided.

  According to the heat recovery and utilization device for an internal combustion engine according to claim 1 of the present invention, at least a part of the refrigerant in the refrigerant chamber adjacent to the combustion chamber via the partition wall takes part of the combustion heat and is in the expansion stroke. Thus, the phase change from the liquid phase to the gas phase prevents the partition wall temperature from excessively increasing during the expansion stroke. Thus, the heat stored by the latent heat of vaporization of the refrigerant is released into the combustion chamber when the phase changes from the gas phase to the liquid phase during the intake stroke, and good intake air heating is realized.

  According to the heat recovery and utilization device for an internal combustion engine according to claim 2 of the present invention, in the heat recovery and utilization device for internal combustion engine according to claim 1, the internal combustion engine is a multi-cylinder internal combustion engine, and Since the refrigerant chamber is provided for each cylinder, the heat stored in the expansion stroke for each cylinder can be used for intake air heating in the intake stroke.

  According to a heat recovery and utilization device for an internal combustion engine according to a third aspect of the present invention, in the heat recovery and utilization device for an internal combustion engine according to the second aspect, the refrigerant chamber of each cylinder is independently provided with a gas-phase refrigerant. Since the pressure adjusting device is provided, the pressure of the gas-phase refrigerant in the refrigerant chamber can be adjusted for each cylinder, and the amount of heat stored by the latent heat of vaporization of the refrigerant in the expansion stroke can be adjusted for each cylinder.

  According to the heat recovery and utilization device for an internal combustion engine according to claim 4 of the present invention, in the heat recovery and utilization device for an internal combustion engine according to claim 3, at least by the pressure adjustment device at the time of low load compared to at the time of high load. The pressure of the gas-phase refrigerant in the refrigerant chamber of one cylinder is increased. Thereby, in at least one cylinder at low load, the amount of heat stored in the refrigerant by the vaporization latent heat during the expansion stroke can be reduced to reduce the cooling loss during combustion, and the latent heat of vaporization during the expansion stroke at high load Thus, the amount of heat stored in the refrigerant can be increased, and knocking during combustion can be suppressed.

  According to the internal combustion engine heat recovery and utilization apparatus of claim 5 according to the present invention, in the internal combustion engine heat recovery and utilization apparatus of claim 3 or 4, the gas phase refrigerant in the refrigerant chamber of the cylinder in which knocking has occurred. The pressure is reduced by a pressure adjusting device as compared with the pressure of the gas-phase refrigerant in the refrigerant chamber of the cylinder in which knocking has not occurred. Accordingly, in the cylinder where knocking has occurred, the amount of heat stored in the refrigerant by the vaporization latent heat during the expansion stroke can be reliably increased to prevent knocking during combustion.

  According to a sixth aspect of the present invention, there is provided the heat recovery and utilization device for an internal combustion engine according to any one of the first to fifth aspects, wherein the internal combustion engine is a compression auto-ignition engine. In a compression auto-ignition engine, it is effective to increase the intake air temperature in order to ensure compression auto-ignition. According to this heat recovery and utilization device, the heat stored in the refrigerant by the latent heat of vaporization during the expansion stroke is When the phase changes from the gas phase to the liquid phase during the intake stroke, it is discharged into the combustion chamber, and good intake air heating can be realized.

  An internal combustion engine heat recovery and utilization device according to a seventh aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to fifth aspects, wherein the fuel of the internal combustion engine is at least methanol or alcohol. Is included. Methanol and alcohol require a large amount of latent heat of vaporization, and according to this heat recovery and utilization device, the heat stored in the refrigerant by the latent heat of vaporization during the expansion stroke is changed when the phase changes from the gas phase to the liquid phase during the intake stroke. The fuel containing at least methanol or alcohol can be vaporized well in order to be released into the combustion chamber and achieve good intake air heating.

  According to the internal combustion engine heat recovery and utilization apparatus as set forth in claim 8 of the present invention, in the internal combustion engine heat recovery and utilization apparatus according to any one of claims 1 to 7, the refrigerant chamber radiates heat to the atmosphere. It has a heat insulation layer for suppressing. As a result, heat release from the heat stored in the refrigerant during the expansion stroke to the atmosphere is suppressed by the heat insulating layer, and good intake air heating during the intake stroke can be realized.

  An internal combustion engine heat recovery and utilization device according to a ninth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to eighth aspects, wherein the internal combustion engine heat recovery and utilization device is adjacent to an upper unit area of the combustion chamber. The volume of the refrigerant chamber is larger than the volume of the adjacent refrigerant chamber per unit area under the combustion chamber. In the expansion stroke, the amount of heat received per unit area in the upper portion of the combustion chamber is larger than the amount of heat received per unit area in the lower portion of the combustion chamber, and more bubbles of refrigerant vapor are generated in the upper portion of the combustion chamber than in the lower portion of the combustion chamber. When the bubbles of the refrigerant vapor come together and are located near the partition wall, it is impossible to take heat from the combustion chamber. Therefore, in the heat recovery and utilization apparatus, the refrigerant adjacent to the unit area of the upper part of the combustion chamber is used. The volume of the chamber is made larger than the volume of the adjacent refrigerant chamber per unit area at the lower portion of the combustion chamber, and the bubbles of the refrigerant vapor are less likely to be agglomerated in the upper portion of the combustion chamber where a large amount of refrigerant vapor bubbles are generated.

  According to the internal combustion engine heat recovery and utilization apparatus as set forth in claim 10 of the present invention, in the internal combustion engine heat recovery and utilization apparatus according to any one of claims 1 to 9, the partition wall protrudes into the refrigerant chamber. Since the heat exchange fins are formed, the refrigerant in the refrigerant chamber can receive heat well from the combustion chamber in the expansion stroke and can radiate heat well to the combustion chamber in the intake stroke.

  According to the internal combustion engine heat recovery and utilization apparatus as set forth in claim 11 of the present invention, in the internal combustion engine heat recovery and utilization apparatus according to any one of claims 1 to 9, the partition wall protrudes into the refrigerant chamber. Since the reinforcing rib is formed, the thickness of the partition wall can be reduced, and the refrigerant in the refrigerant chamber can receive heat well from the combustion chamber in the expansion stroke and can radiate heat well to the combustion chamber in the intake stroke. it can.

  An internal combustion engine heat recovery and utilization device according to a twelfth aspect of the present invention is the internal combustion engine heat recovery and utilization device according to any one of the first to eleventh aspects, wherein the refrigerant chamber extends vertically. An existing heat transfer member is provided. In the expansion stroke, the amount of heat received per unit area in the upper part of the combustion chamber is greater than the amount of heat received per unit area in the lower part of the combustion chamber. Thereby, according to this heat recovery and utilization device, in order for the heat transfer member to transfer a part of the amount of heat received in the upper part of the combustion chamber to the lower part of the combustion chamber, the generation of refrigerant vapor in the lower part of the combustion chamber is increased. The amount of heat stored as a whole by latent heat of vaporization can be increased.

  FIG. 1 is a schematic view of an internal combustion engine equipped with a heat recovery utilization apparatus according to the present invention. In the figure, 1 is a spark plug and 2 is a combustion chamber. 3 is an intake port that leads to the combustion chamber 2 via the intake valve 4, and 5 is an exhaust port that leads to the combustion chamber 2 via the exhaust valve 6. A fuel injection valve 7 is disposed in the intake port 2. 8 is a piston.

  This internal combustion engine is not a water-cooled type having a water jacket and a radiator, but as a heat recovery and utilization device, the cylinder head, the cylinder block, and the piston 8 are provided with a refrigerant chamber adjacent to the combustion chamber 2 via a partition wall. ing. The first refrigerant chamber 9 provided in the cylinder head is provided between the two intake ports 3, between the two exhaust ports 5, and between the intake port 3 and the exhaust port (two locations) around the spark plug 1. And four closed spaces. The second refrigerant chamber 10 provided in the cylinder block has a closed space surrounding the combustion chamber 2 in an annular shape. Moreover, as shown in FIG. 2 which is AA cross section of FIG. 1 of the piston, the third refrigerant chamber 11 provided in the piston 8 has a closed space with a central circular cross section and three annular cross sections surrounding it. And a closed space.

  As the refrigerant in each of the refrigerant chambers 9, 10, and 11, methanol, butane, ammonia, chlorofluorocarbon, ethanol, carbon dioxide, or the like can be used. Each of the refrigerant chambers 9, 10, and 11 is filled with a liquid phase refrigerant and a gas phase refrigerant of the same substance for each closed space. In particular, the second refrigerant chamber 10 provided in the cylinder block has a gas phase chamber 10a communicating with the annular closed space.

  According to the heat recovery and utilization device according to the present invention configured as described above, at least a part of the liquid phase refrigerant in the refrigerant chambers 9, 10 and 11 adjacent to the combustion chamber 2 through the partition wall is free of combustion heat. A part is taken away to change the phase from the liquid phase to the gas phase during the expansion stroke, and the partition wall temperature is prevented from being excessively increased by the heat of combustion during the expansion stroke. Thus, the heat stored by the latent heat of vaporization of the refrigerant is released to the combustion chamber when the phase changes from the gas phase to the liquid phase during the intake stroke, and good intake air heating can be realized.

  In the normal water cooling type or air cooling type, a part of the combustion heat is finally released into the atmosphere and cannot be recovered at all. In addition, it is conceivable to use the heat of the exhaust gas for intake air heating. However, this makes it difficult to quickly warm up the catalyst device to the catalyst activation temperature and maintain the catalyst activation temperature in the engine exhaust system. .

  In the case where the internal combustion engine is a multi-cylinder internal combustion engine, the heat recovery and utilization apparatus is provided with the refrigerant chambers 9, 10, and 11 for each cylinder, and therefore the heat stored in the expansion stroke for each cylinder. Can be used for intake air heating in the intake stroke.

  FIG. 3 shows a gas pressure chamber 10a ′ of the second refrigerant chamber 10 arranged outside the cylinder block as a pressure adjusting device for adjusting the pressure in the gas phase chamber 10a ′ to the gas phase chamber 10a ′. The case where the piston 12 which moves up and down is provided is shown. Thus, if the gas refrigerant pressure adjusting device 12 is independently provided in the second refrigerant chamber 10 for each cylinder, the pressure adjustment of the gas phase refrigerant in the second refrigerant chamber can be performed for each cylinder, and expansion is performed for each cylinder. In the process, the amount of heat stored by the latent heat of vaporization of the refrigerant can be adjusted.

  That is, if the volume of the gas phase chamber is reduced by the piston 12 and the pressure of the gas phase refrigerant in the gas phase chamber is increased, the amount of refrigerant vaporized in the expansion stroke is reduced (if the pressure of the gas phase refrigerant is high, When a small amount of refrigerant is vaporized, the gas-phase refrigerant temperature, the liquid-phase refrigerant temperature, and the temperature in the combustion chamber become equal, and the refrigerant no longer vaporizes.) Reduce the amount of heat stored by the latent heat of vaporization Can do. Further, if the volume of the gas phase chamber is increased by the piston 12 to lower the pressure of the gas phase refrigerant in the gas phase chamber, the amount of refrigerant vaporized in the expansion stroke increases, and the amount of heat stored by the vaporization latent heat increases. be able to.

  For example, if the pressure of the gas-phase refrigerant in the second refrigerant chambers 10 of all the cylinders is increased by all the pressure adjusting devices 12 when the load is low, vaporization occurs during the expansion stroke at the low load. The amount of heat stored by the refrigerant is reduced by latent heat, reducing the cooling loss during combustion, and the amount of heat stored by the refrigerant is increased by latent heat of vaporization during the expansion stroke at high loads, suppressing the occurrence of knocking during combustion. be able to.

  Further, the pressure adjusting device 12 compares the pressure of the gas phase refrigerant in the second refrigerant chamber 10 of the cylinder where knocking has occurred with the pressure of the gas phase refrigerant in the second refrigerant chamber 10 of the cylinder where knocking has not occurred. By reducing the amount of heat generated in the cylinder in which knocking has occurred, the amount of heat stored in the refrigerant by the latent heat of vaporization during the expansion stroke can be reliably increased to prevent knocking during combustion.

  The present heat recovery and utilization device can obtain the above-described effects regardless of which internal combustion engine is applied. In particular, when applied to a compression ignition engine, in a compression ignition engine, in order to ensure compression ignition, it is effective to increase the intake air temperature. The heat stored in the refrigerant can be effectively used for intake air heating in the intake stroke.

  In addition, when the fuel of the internal combustion engine to which the present heat recovery and utilization apparatus is applied contains at least methanol or alcohol, the methanol and alcohol require a large amount of latent heat of vaporization, and therefore vaporize during the expansion stroke. The heat stored in the refrigerant by the latent heat can be effectively used for intake air heating in the intake stroke, and fuel containing at least methanol or alcohol can be vaporized well.

  In FIG. 1, heat insulating layers 91, 101, and 111 made of ceramic or the like are provided on the opposite sides of the refrigerant chambers 9, 10, and 11 from the combustion chamber 2. As a result, the heat release from the heat stored in the refrigerant during the expansion stroke to the atmosphere is suppressed by these heat insulating layers, and good intake air heating during the intake stroke can be realized.

  FIG. 4 is a schematic view showing a modification of the second refrigerant chamber 10 shown in FIG. In FIG. 4, the cylinder head and the piston 8 'are not provided with a refrigerant chamber. The refrigerant chamber 20 provided in the cylinder block has a heat insulating layer 201 on the side opposite to the combustion chamber 2, and the volume adjacent to the unit area of the upper portion of the combustion chamber is combusted via a uniform thickness partition wall. It is larger in the radial direction than the adjacent volume per unit area of the lower part of the room. In this modification, the outer surface of the refrigerant chamber 20 has a truncated conical shape, and the volume of the refrigerant chamber adjacent per unit area from the upper portion of the combustion chamber to the lower portion of the combustion chamber is gradually reduced. However, a step is provided on the outer surface of the refrigerant chamber 20 so that the volume of the refrigerant chamber adjacent to the unit area of the upper portion of the combustion chamber is larger in the radial direction than the volume of the refrigerant chamber adjacent to the unit area of the lower portion of the combustion chamber. You may make it do.

  In the expansion stroke, the amount of heat received per unit area in the upper portion of the combustion chamber is larger than the amount of heat received per unit area in the lower portion of the combustion chamber, and more bubbles of refrigerant vapor are generated in the upper portion of the combustion chamber than in the lower portion of the combustion chamber. When the bubbles of the refrigerant vapor become a lump and are located in the vicinity of the partition wall, almost no heat can be taken from the combustion chamber. Thereby, according to this modification, the volume of the refrigerant chamber adjacent per unit area of the upper part of the combustion chamber is made larger than the volume of the refrigerant chamber adjacent per unit area of the lower part of the combustion chamber, and there are many bubbles of refrigerant vapor. In the upper part of the generated combustion chamber, the bubbles of the refrigerant vapor are less likely to become lumps.

  5 is a cross-sectional view showing the second refrigerant chamber 10 taken along the line AA of FIG. 1 or the second refrigerant chamber 20 taken along the line BB of FIG. In the modification shown in FIG. 5, heat exchange fins 13 protruding into the second refrigerant chamber 10 or 20 are formed in the partition wall between the combustion chamber 2. Thereby, the refrigerant in the second refrigerant chamber can receive heat from the combustion chamber well in the expansion stroke, and can be radiated well to the combustion chamber in the intake stroke.

  FIG. 6 is a cross-sectional view corresponding to FIG. 5, and the second refrigerant chamber of the modified example shown in FIG. 6 includes a plurality of circular cross-section vertical holes 30 extending in the vertical direction of the combustion chamber. The plurality of vertical holes 30 may have an arbitrary cross section instead of a circular cross section. Further, the plurality of vertical holes 30 may have a gas phase region independently of each other, but are connected to each other at a specific height position so as to have a common gas phase chamber as shown in FIG. Also good. A heat insulating layer 301 similar to that shown in FIGS. 1 and 4 is provided outside the plurality of vertical holes 30.

  Thus, when the second refrigerant chamber is formed from the plurality of vertical holes 30, the partition wall 30 'between the vertical holes 30 is separated from the partition wall 31 between the combustion chamber 2 and the annular cross-section refrigerant chamber (of FIGS. 1 and 4). It can be considered that the reinforcing rib protrudes into the second refrigerant chamber (such as the second refrigerant chamber), that is, it can be considered that the refrigerant chamber having an annular cross section is divided into a plurality of vertical hole refrigerant chambers by the reinforcing rib. Since the thickness of the partition wall 31 between the plurality of reinforcing ribs and the combustion chamber can be reduced, the refrigerant in each vertical hole-shaped refrigerant chamber 30 is well received from the combustion chamber during the expansion stroke, It is possible to dissipate heat to the combustion chamber well during the stroke. Further, in the third refrigerant chamber 11 of the piston 8 of FIG. 2, the partition wall 11a that partitions the closed space having the circular cross section and the closed space having the three annular cross sections can be considered as the reinforcing rib, and the same effect can be obtained. Can do.

  In FIG. 1, a heat transfer member 14 extending in the vertical direction of the combustion chamber is provided in the second refrigerant chamber 10. The heat transfer member 14 may be a metal mesh such as silver, aluminum, or copper, or metal cotton. As described above, in the expansion stroke, the amount of heat received per unit area in the upper portion of the combustion chamber is larger than the amount of heat received per unit area in the lower portion of the combustion chamber. As a result, the heat transfer member 14 transfers a part of the amount of heat received in the upper part of the combustion chamber to the lower part of the combustion chamber, thereby increasing the generation of refrigerant vapor in the lower part of the combustion chamber and increasing the amount of heat stored in the entire refrigerant by the latent heat of vaporization. be able to.

It is the schematic of the internal combustion engine with which the heat recovery utilization apparatus by this invention was attached. It is AA sectional drawing of FIG. 1 of a piston. It is a figure which shows the modification of the gaseous-phase chamber of FIG. It is a figure which shows the modification of a 2nd refrigerant | coolant chamber. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 1 or a cross-sectional view taken along the line BB in FIG. 4 showing another modification of the second refrigerant chamber. FIG. 6 is a cross-sectional view corresponding to FIG. 5 showing still another modification of the second refrigerant chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 1st refrigerant | coolant chamber 10 2nd refrigerant | coolant chamber 10a, 10a 'Gas phase chamber 11 Third refrigerant chamber 12 Pressure regulator 13 Heat exchange fin 30' Reinforcement rib

Claims (12)

  A refrigerant chamber is provided adjacent to the combustion chamber via a partition wall, and at least a part of the refrigerant in the refrigerant chamber undergoes a phase change from the liquid phase to the gas phase during the expansion stroke, and changes from the gas phase to the liquid phase during the intake stroke. A heat recovery and utilization device for an internal combustion engine, characterized in that the phase changes.   2. The heat recovery and utilization device for an internal combustion engine according to claim 1, wherein the internal combustion engine is a multi-cylinder internal combustion engine, and the refrigerant chamber is provided independently for each cylinder of the multi-cylinder internal combustion engine.   The internal combustion engine heat recovery and utilization device according to claim 2, wherein a gas pressure refrigerant pressure adjusting device is independently provided in the refrigerant chamber for each cylinder.   4. The heat recovery and utilization device for an internal combustion engine according to claim 3, wherein the pressure of the gas phase refrigerant in the refrigerant chamber of at least one cylinder is increased by the pressure adjusting device when the load is low as compared with when the load is high.   A pressure of the gas phase refrigerant in the refrigerant chamber of the cylinder in which knocking has occurred is reduced by the pressure adjusting device as compared with a pressure of the gas phase refrigerant in the refrigerant chamber of the cylinder in which knocking has not occurred. The heat recovery utilization apparatus of the internal combustion engine according to claim 3 or 4.   6. The heat recovery and utilization device for an internal combustion engine according to claim 1, wherein the internal combustion engine is a compression auto-ignition engine.   The heat recovery utilization apparatus for an internal combustion engine according to any one of claims 1 to 5, wherein the fuel for the internal combustion engine contains at least methanol or alcohol.   The heat recovery and utilization device for an internal combustion engine according to any one of claims 1 to 7, wherein the refrigerant chamber has a heat insulating layer for suppressing heat radiation to the atmosphere.   The volume of the refrigerant chamber adjacent per unit area of the upper combustion chamber is larger than the volume of the refrigerant chamber adjacent per unit area of the lower combustion chamber. The heat recovery utilization apparatus of the internal combustion engine described in 1.   The heat recovery and utilization device for an internal combustion engine according to any one of claims 1 to 9, wherein a heat exchange fin protruding into the refrigerant chamber is formed on the partition wall.   The heat recovery utilization apparatus for an internal combustion engine according to any one of claims 1 to 9, wherein a reinforcing rib protruding into the refrigerant chamber is formed in the partition wall.   The heat recovery utilization apparatus for an internal combustion engine according to any one of claims 1 to 11, wherein a heat transfer member extending in a vertical direction of the combustion chamber is provided in the refrigerant chamber.

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