JP2010116911A - Heat accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat accumulator which can reduce the thermal loss in the heat dissipation process in addition to the thermal loss in the heat accumulation process. <P>SOLUTION: The heat accumulator includes the heat accumulation section 10 provided in the exhaust passage 110 which discharges the exhaust of engine 100 outside, wherein the heat accumulation section accumulates heat making use of the heat of the exhaust; the heat transport section 30 which evaporates the heat transport medium which is enclosed the inside by the heat transfer from the exhaust or the heat accumulation section 10, wherein the heat transport section is provided in the exhaust passage 110 and thermally connected to the heat accumulation section 10; and the heat recovery section 40 which heats an object to be heated through heat exchange with the heat transport medium at the heat transport section 30, and condenses the heat transport medium and returns it back to the heat transport section 30, in which the heat recovery section 40 is disposed such that it surrounds the circumference of the heat accumulation section 10 and the heat transport section 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat storage device that stores heat using exhaust heat of an internal combustion engine.

Patent Document 1 discloses a conventional heat storage device that stores heat using exhaust heat of an engine. This heat storage device includes a reactor filled with a chemical heat storage agent, a high-temperature heat supply heat exchanger that heats brine that flows through the engine exhaust heat, and a high-temperature heat supply heat exchanger that is provided in the reactor. And a high temperature side heat exchanger that heats the chemical heat storage agent by heat exchange with the brine heated in step (b). The high temperature heat supply heat exchanger and the high temperature side heat exchanger are connected via a heat exchanger pipe through which brine flows. The chemical heat storage agent causes an endothermic reaction by the exhaust heat of the engine supplied through the high-temperature heat supply heat exchanger, the brine, and the high-temperature side heat exchanger, thereby storing heat.
JP 2008-111152 A

  In the above heat storage device, since the reactor is arranged at a position away from the exhaust pipe, exhaust heat is supplied to the chemical heat storage agent in the reactor by using the brine flowing through the heat exchanger pipe as a medium. It is like that. Therefore, the heat dissipation from the heat exchanger pipe causes the heat dissipation outside the system until the exhaust heat is supplied to the chemical heat storage agent, and there is a problem that the heat loss in the heat storage process increases.

  In order to reduce this heat loss, the present applicant has proposed a heat storage device in which a reactor is installed in an exhaust pipe in Japanese Patent Application No. 2008-278747 (unpublished technology). In this heat storage device, exhaust heat can be supplied to the reactor without passing through a heat medium in the heat storage process, so heat loss in the heat storage process can be reduced. However, even in this heat storage device, when considering the heat dissipation process in which the stored heat is dissipated and moved to the object to be heated, all the heat generated in the reactor is not transmitted to the heat recovery unit and is dissipated outside the system. Therefore, heat loss will occur.

  The objective of this invention is providing the thermal storage apparatus which can reduce the thermal loss of a thermal radiation process in addition to the thermal loss of a thermal storage process.

  In order to achieve the above object, the present invention employs the following technical means.

  The invention according to claim 1 is provided in the exhaust passage (110) for discharging the exhaust of the internal combustion engine (100) to the outside, and a heat storage section (10) for storing heat using the heat of the exhaust, and the exhaust passage (110). A heat transport unit (30) that is thermally connected to the heat storage unit (10) and that evaporates the heat transport medium enclosed therein by heat transfer from the exhaust or the heat storage unit (10), and a heat transport unit A heat recovery part (40) for heating the object to be heated by heat exchange with the heat transport medium evaporated in (30) and condensing the heat transport medium and returning it to the heat transport part (30). (40) is a heat storage device characterized by being arranged so as to surround the heat storage unit (10) and the heat transport unit (30).

  In the heat dissipation process of moving the heat of the heat storage unit (10) to the object to be heated through the heat transport unit (30), the heat transport medium and the heat recovery unit (40), the heat storage unit (10) and the heat transport unit (30). Becomes higher than the outside, and in particular, the heat storage section (10) has the highest temperature. For this reason, the heat of the heat storage unit (10) is effectively transmitted to the object to be heated through the heat transport unit (30), the heat transport medium, and the heat recovery unit (40), or by heat conduction (10). ) And the heat transport part (30) may be radiated to the outside of the system. However, when the heat recovery unit (40) is disposed so as to surround the heat storage unit (10) and the heat transport unit (30), the heat recovery unit (40) is released from the heat storage unit (10) and the heat transport unit (30). The heat is transferred to the heat recovery section (40) without being dissipated outside the system, and consequently contributes to the heating of the heating target. Therefore, heat loss in the heat dissipation process of the heat storage device can be reduced.

  Moreover, since the heat storage part (10) is provided in the exhaust passage (110), exhaust heat can be supplied to the heat storage part (10) without a heat medium in the heat storage process. Therefore, heat loss in the heat storage process of the heat storage device can be reduced.

  The invention according to claim 2 is characterized in that the heat recovery part (40) has a cylindrical shape surrounding the entire circumference of the heat storage part (10) and the heat transport part (30).

  Thereby, since the heat released from the entire circumference of the heat storage unit (10) can be transferred to the heat recovery unit (40), the heat loss in the heat dissipation process of the heat storage device can be further reduced.

  The invention according to claim 3 has a structure in which the heat storage section (10) is filled with a chemical heat storage agent (11) in which an exothermic / endothermic reaction is reversibly performed, and is used for an exothermic / endothermic reaction. The reaction medium is accommodated, and the evaporated reaction medium is sent to the heat storage section (10), and further includes an evaporation condensation section (50) for condensing the reaction medium flowing from the heat storage section (10), and the evaporation condensation section (50). Is characterized by being arranged so as to surround the heat storage section (10) and the heat transport section (30) together with the heat recovery section (40).

  Thereby, since a thermal storage apparatus can be reduced in size, the mounting property to the vehicle of a thermal storage apparatus can be improved.

  The invention according to claim 4 is characterized in that the evaporating and condensing part (50) and the heat storage part (10) are thermally connected to each other.

  Thereby, in the heat dissipation process, the reaction medium in the evaporation condensing part (50) is easily heated and evaporated by heat transfer from the heat storage part (10), so that the reaction medium can be quickly supplied to the heat storage part (10). The exothermic reaction of the chemical heat storage agent (11) can be promoted.

  The invention according to claim 5 further includes heat transfer fins (53) that promote heat transfer between the evaporating and condensing part (50) and the heat storage part (10).

  Thereby, since heat can be actively transferred from the heat storage unit (10) to the evaporation condensing unit (50), the temperature increase of the reaction medium in the evaporation condensing unit (50) is promoted, and the evaporation becomes easier.

  The invention according to claim 6 is characterized in that the heat transfer fin (53) is provided on the lower side of the evaporating and condensing part (50).

  Thereby, heat can be effectively transferred from the heat storage section (10) to the liquid reaction medium in the evaporation condensation section (50).

  The invention according to claim 7 is characterized in that the heat storage section (12) and the heat transport section (35) are alternately stacked.

  Thereby, since the heat transfer area between a heat storage part (12) and a heat transport part (35) can be increased, the heat transfer between a heat storage part (12) and a heat transport part (35) is accelerated | stimulated. it can.

  In addition, the code | symbol in the bracket | parenthesis of each said means has shown an example of the corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows the configuration of the heat storage device in the present embodiment. FIG. 2 schematically shows a cross-sectional configuration in which the vicinity of the heat transport portion of the heat storage device in the present embodiment is cut perpendicular to the exhaust circulation direction. As shown in FIGS. 1 and 2, the heat storage device 1 of this embodiment is mounted on a vehicle including a water-cooled engine (internal combustion engine) 100 and an exhaust passage 110 that exhausts the exhaust of the engine 100 to the outside. ing.

In the middle of the exhaust passage 110, the heat storage unit 10 of the heat storage device 1 is provided. The heat storage unit 10 stores and radiates heat using the heat of the exhaust gas flowing through the exhaust passage 110. The heat storage unit 10 is a container body made of, for example, stainless steel having a predetermined shape. The internal space of the heat storage unit 10 is filled with particulate chemical heat storage agent 11 so that heat exchange is performed with the exhaust flowing outside the container body. As the chemical heat storage agent 11, for example, a metal oxide such as CaO or MgO is used. The chemical heat storage agent 11 performs reversible exothermic / endothermic reactions using, for example, water (water vapor) as a reaction medium. The chemical reaction formulas (1) and (2) of the exothermic / endothermic reaction when CaO is used as the chemical heat storage agent 11 and water (water vapor) is used as the reaction medium are shown below.
_{CaO + H 2 O → Ca (} OH) 2 + Q ( heat) (1)
Ca (OH) ₂ → CaO + H ₂ O-Q (endothermic) (2)
Outside the exhaust passage 110, there is provided an evaporating and condensing unit 20 that accommodates the reaction medium inside. The evaporative condensing unit 20 performs heat exchange between the internal reaction medium and the outside air. The evaporating and condensing unit 20 is connected to the heat storage unit 10 via a reaction medium pipe 21. One end of the reaction medium pipe 21 is inserted into the heat storage unit 10 and is open inside the heat storage unit 10. The other end of the reaction medium pipe 21 is inserted into the evaporating and condensing part 20 and is opened above the liquid level of the reaction medium. The reaction medium pipe 21 is provided with an electric valve 22. The valve 22 is controlled to be opened and closed by a control unit (not shown).

  A heat transport unit 30 is provided in the middle of the exhaust passage 110. The heat transport unit 30 is a container body made of, for example, stainless steel having a predetermined shape. A predetermined heat transport medium (for example, water) is sealed in the internal space of the heat transport unit 30, and heat exchange is performed with the exhaust flowing outside the container body. As the heat transport medium, alcohol, fluorocarbon, chlorofluorocarbon (fluorocarbon), or the like can be used in addition to water. The heat transport unit 30 is thermally connected to the heat storage unit 10 via a heat transfer surface 34 having a predetermined shape. The heat transport medium inside the heat transport unit 30 is heated and evaporated by heat transfer from the exhaust or heat transfer from the heat storage unit 10. The heat transport unit 30 constitutes a heat generation unit together with the heat storage unit 10, and in the present embodiment, the heat generation unit has a cylindrical shape.

  A heat recovery unit 40 is disposed around the heat storage unit 10 and the heat transport unit 30. The heat recovery unit 40 is a container made of, for example, stainless steel having a hollow cylindrical internal space, and is arranged so as to surround the entire outer periphery (side surface) of the heat storage unit 10 and the heat transport unit 30. The heat recovery unit 40 is thermally connected to, for example, the heat storage unit 10 and the heat transport unit 30.

  The heat recovery unit 40 communicates with the upper end portion of the heat transport unit 30 via the steam channel 31 and communicates with the lower end portion of the heat transport unit 30 via the reflux path 32. Thereby, the heat transport unit 30 and the heat recovery unit 40 constitute a loop heat pipe device. Since the inside of the heat transport unit 30 and the heat recovery unit 40 is maintained in a substantially vacuum state in which a gas other than water is exhausted, the pressure is a saturation pressure corresponding to the temperature of water.

  An electric valve 33 is provided in the reflux path 32. The valve 33 is controlled to be opened and closed by a control unit.

  Inside the heat recovery unit 40, a heat recovery heat exchanger 41 is provided for circulating cooling water (heating target) of the engine 100 therein. The heat recovery heat exchanger 41 is disposed in the heat recovery unit 40 with a relatively long path length, and heats the cooling water by heat exchange with the heat transport medium in the heat recovery unit 40. .

  Although not shown in the figure, inside the heat storage device 1, a pipe that is formed through the heat storage unit 10 and the heat transport unit 30 and constitutes a part of the exhaust passage 110 is provided. The flow path of the exhaust gas in the pipe is spatially isolated from the internal spaces of the heat storage unit 10 and the heat transport unit 30, but between the exhaust gas flowing in the pipe and the heat storage unit 10 and the heat transport unit 30. Heat transfer is possible.

  Next, the operation of the heat storage device in the present embodiment will be described.

  First, a heat dissipation process performed when the engine 100 is started at a low temperature will be described. When the engine 100 is started, the valves 22 and 33 are opened under the control of the control unit. When the valve 22 is opened, the reaction medium (steam or liquid) in the evaporation condensing unit 20 flows into the heat storage unit 10 through the reaction medium piping 21. When the reaction medium flows in, the exothermic reaction (hydrolysis) shown in the chemical reaction formula (1) proceeds in the heat storage unit 10. The heat generated in the heat storage unit 10 due to the exothermic reaction of the chemical heat storage agent 11 moves to the heat transport unit 30 mainly via the heat transfer surface 34.

  In the heat transport unit 30, the heat transport medium is heated by the heat transfer from the heat storage unit 10, and evaporates at a boiling point. The evaporated heat transport medium flows into the heat recovery unit 40 via the steam flow path 31. In the heat recovery unit 40, heat exchange is performed between the heat transport medium that has flowed in and the cooling water flowing through the heat recovery heat exchanger 41, and the heat transport medium is condensed while the cooling water is heated. The condensed heat transport medium returns to the heat transport unit 30 through the reflux path 32. Thus, the heat generated in the heat storage unit 10 and transferred to the heat transport unit 30 moves to the cooling water in the heat recovery heat exchanger 41 by the heat pipe action. Thereby, since the temperature rise of a cooling water is accelerated | stimulated, the start-up of the heating using the warming-up of the engine 100 or a cooling water can be performed at an early stage.

  In the present embodiment, heat is transferred not only from the heat storage unit 10 but also from the exhaust to the heat transport unit 30, so that normal exhaust heat recovery is performed even after the end of the heat dissipation process. In the heat transport section 30, the heat transport medium is heated and evaporated by boiling due to heat transfer from the exhaust. The evaporated heat transport medium flows into the heat recovery unit 40 via the steam flow path 31. In the heat recovery unit 40, heat exchange between the heat transport medium that has flowed in and the cooling water flowing through the heat recovery heat exchanger 41 is performed. Thereby, the cooling water is heated and the heat transport medium is condensed. The condensed heat transport medium returns to the heat transport unit 30 through the reflux path 32. Thus, the heat of the exhaust moves to the cooling water in the heat recovery heat exchanger 41 by the heat pipe action.

  When the cooling water is sufficiently heated and exceeds a predetermined temperature, the valve 33 is closed under the control of the control unit. Thereby, the reflux of the heat transport medium condensed in the heat recovery unit 40 to the heat transport unit 30 is prevented, and the recovery of the exhaust heat is stopped.

  Next, the heat storage process will be described. The heat storage process is performed after the above-described heat release process, for example, during steady running when the exhaust gas temperature is sufficiently high. During the heat storage process, the valve 22 is in an open state. In the heat storage unit 10, the chemical heat storage agent 11 is heated by the exhaust, and the endothermic reaction (dehydration reaction) shown in the chemical reaction formula (2) proceeds. Thereby, regeneration (heat storage) of the chemical heat storage agent 11 is performed. The reaction medium (steam) released from the chemical heat storage agent 11 by the dehydration reaction flows into the evaporative condensation unit 20 through the reaction medium pipe 21. The reaction medium that has flowed into the evaporating and condensing unit 20 is cooled and condensed by heat exchange with the outside air, becomes a liquid state, and is accommodated in the evaporating and condensing unit 20. When the regeneration of the chemical heat storage agent 11 is completed, the valve 22 is closed under the control of the control unit. Thereby, since the inflow of the reaction medium to the thermal storage part 10 is blocked | prevented, a thermal storage state is maintained.

  In the above heat dissipation process, the heat storage unit 10 and the heat transport unit 30 have a higher temperature than the outside, and in particular, the heat storage unit 10 has the highest temperature. For this reason, in addition to being effectively transmitted to the cooling water through the heat transport unit 30 and the heat recovery unit 40, the heat generated in the heat storage unit 10 may be released outside the system by conduction or radiation. However, in the present embodiment, since the heat storage unit 10 and the heat transport unit 30 are surrounded by the heat recovery unit 40, the heat released from the outer periphery of the heat storage unit 10 and the heat transport unit 30 is dissipated outside the system. Instead, the heat is transferred to the heat recovery unit 40 and consequently contributes to the heating of the cooling water in the heat recovery heat exchanger 41.

  For example, when the heat released from the outer periphery of the heat storage unit 10 is transferred to the heat recovery unit 40 without passing through the heat transfer unit 30, and the liquid heat transfer medium staying in the heat recovery unit 40 is evaporated. To do. Even in this case, in the heat recovery unit 40, heat exchange between the evaporated heat transport medium and the cooling water in the heat recovery heat exchanger 41 is performed, and the heat transport medium is condensed and the cooling water is heated. The That is, the heat released from the outer peripheral portion of the heat storage unit 10 eventually moves to the cooling water in the heat recovery heat exchanger 41.

  Therefore, according to the present embodiment, since heat that can be released from the outer periphery of the heat storage unit 10 and the heat transport unit 30 can be recovered, the heat recovery efficiency of the heat storage device 1 can be improved and heat loss in the heat dissipation process Can be reduced.

  Moreover, in this embodiment, since the heat recovery unit 40 has a cylindrical shape that surrounds the entire circumference of the heat storage unit 10 and the heat transport unit 30, the heat recovery unit 40 is discharged from the outer periphery of the heat storage unit 10 and the heat transport unit 30. You can recover most of the heat you get. Therefore, the heat recovery efficiency of the heat storage device 1 can be further improved, and the heat loss in the heat dissipation process can be further reduced.

  Furthermore, in this embodiment, since the heat recovery part 40 is disposed adjacent to the outer peripheral part of the heat transport part 30, the flow path length of the steam flow path 31 can be shortened. Therefore, an effect of reducing heat dissipation loss in the steam flow path 31 can also be obtained.

  Moreover, in this embodiment, since the heat storage part 10 is provided in the exhaust passage 110, exhaust heat can be supplied to the chemical heat storage agent 11 of the heat storage part 10 without a heat medium in the heat storage process. Therefore, heat loss in the heat storage process can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 schematically shows the configuration of the heat storage device 2 in the present embodiment. FIG. 4 schematically shows a cross-sectional configuration in which the vicinity of the evaporating and condensing unit 50 of the heat storage device 2 in the present embodiment is cut perpendicularly to the exhaust circulation direction. As shown in FIGS. 3 and 4, in the heat storage device 2 of the present embodiment, the evaporative condensing unit 50 recovers heat around the heat storage unit 10 and the heat transport unit 30 compared to the heat storage device 1 of the first embodiment. It is characterized in that it is arranged so as to surround the portion 40 together.

  The evaporating and condensing unit 50 is a container made of, for example, stainless steel having an annular inner space, and constitutes a cylindrical body together with the heat recovery unit 40. This cylindrical body is disposed so as to surround the entire circumference of the heat storage unit 10 and the heat transport unit 30. The inner peripheral side of the evaporating and condensing unit 50 is thermally connected to the heat storage unit 10, for example. Heat exchange is performed between the internal reaction medium and the outside air mainly on the outer peripheral side of the evaporating and condensing unit 50. The upper part of the evaporating and condensing part 50 and the upper part of the heat storage part 10 are connected via a reaction medium channel 51. The reaction medium flow path 51 is provided with an electric valve 52 that is controlled to be opened and closed by a control unit.

  During the heat dissipation process, the liquid reaction medium in the evaporating and condensing unit 50 is heated by heat transfer from the heat accumulating unit 10 to promote evaporation. The evaporated reaction medium flows into the heat storage unit 10 through the reaction medium channel 51.

  Further, in the heat storage process, the reaction medium (steam) released from the chemical heat storage agent 11 flows into the upper part of the evaporation condensing unit 50 through the reaction medium flow path 51. The reaction medium that has flowed in is cooled and condensed by heat exchange with the outside air mainly on the upper outer peripheral side of the evaporative condensing unit 50, becomes liquid, and is accommodated in the evaporative condensing unit 20. About the operation | movement of the other heat storage apparatus 2, since it is the same as that of the heat storage apparatus 1 of 1st Embodiment, description is abbreviate | omitted.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the evaporative condensing unit 50 is disposed so as to surround the heat storage unit 10 and the heat transport unit 30, so that the heat storage device 2 is reduced in size. And the shape of the heat storage device 2 can be improved.

  In the present embodiment, the evaporation condensing unit 50 is thermally connected to the heat storage unit 10. For this reason, in the heat dissipation process, the liquid state reaction medium in the evaporation condensing unit 50 is easily heated and evaporated by the heat transfer from the heat storage unit 10, and the reaction medium can be quickly supplied to the heat storage unit 10.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 schematically shows the configuration of the heat storage device 3 in the present embodiment. As shown in FIG. 5, the heat storage device 3 of the present embodiment has a heat transfer fin 53 for actively transferring heat from the heat storage unit 10 to the evaporation condensing unit 50 as compared with the heat storage device 2 of the second embodiment. It is characterized in that is provided.

  The heat transfer fins 53 are formed so as to protrude from both the heat storage unit 10 side and the evaporation condensation unit 50 side, for example, in the partition wall between the heat storage unit 10 and the evaporation condensation unit 50. The heat transfer fins 53 are concentrated on the lower side (liquid side) of the evaporating and condensing unit 50, and are provided only below the liquid level of the reaction medium at normal temperature, for example.

  According to the present embodiment, part of the reaction heat generated in the heat storage unit 10 can be positively transferred to the liquid reaction medium in the evaporation condensing unit 50 in the heat dissipation process. For this reason, even when the temperature of the reaction medium is low and the reactivity is low, the reaction medium can be heated using a part of the reaction heat as an auxiliary heat source. Therefore, the reaction medium is easily evaporated, and the reaction medium can be quickly supplied to the heat storage unit 10, so that the exothermic reaction of the chemical heat storage agent 11 can be promoted.

  In the present embodiment, since the heat transfer fins 53 are concentrated on the lower side of the evaporating and condensing unit 50, heat transfer is effectively performed from the heat storage unit 10 to the liquid reaction medium in the evaporating and condensing unit 50. Can be made.

  This embodiment is effective when the amount of heat generated in the heat storage unit 10 by the reaction between the vaporized reaction medium and the chemical heat storage agent 11 is larger than the amount of heat taken from the heat storage unit 10 as the heat of vaporization of the reaction medium. is there. For this reason, it is desirable to satisfy the condition that the reaction heat between the chemical heat storage agent 11 and the reaction medium is larger than the heat of vaporization of the reaction medium. This condition is satisfied at least when a metal oxide such as CaO or MgO is used as the chemical heat storage agent 11 and water is used as the reaction medium.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 schematically shows the configuration of the heat storage device 4 in the present embodiment. As shown in FIG. 6, the heat storage device 4 of the present embodiment is characterized in that the heat storage units 12 and the heat transport units 35 are alternately stacked in the exhaust flow direction.

  Each heat storage part 12 is a container body provided with a flat internal space that extends in a plane substantially perpendicular to the flow direction of exhaust gas. The internal spaces of the heat storage units 12 communicate with each other via a communication unit 13 provided above. The internal space of the heat storage unit 12 is filled with a particulate chemical heat storage agent 11 (not shown in FIG. 6). Moreover, each heat transport part 35 is formed between the two heat storage parts 12 between the heat storage parts 12 adjacent to each other. The internal spaces of the heat transporting part 35 communicate with each other via a communicating part 36 provided above and a communicating part 37 provided below. The heat storage unit 12 and the heat transport unit 35 have a structure like a stacked heat exchanger.

  Although not shown in the figure, inside the heat storage device 4, a pipe that is formed through all the heat storage units 12 and the heat transport unit 35 and constitutes a part of the exhaust passage 110 is provided. The flow path of the exhaust in the pipe is spatially isolated from the internal spaces of the heat storage unit 12 and the heat transport unit 35, but between the exhaust flowing in the pipe and the heat storage unit 12 and the heat transport unit 35. Heat transfer is possible.

  According to this embodiment, since the heat transfer area between the heat storage part 12 and the heat transport part 35 can be increased, the heat transfer between the heat storage part 12 and the heat transport part 35 can be promoted.

(Other embodiments)
In the said embodiment, although the heat recovery part 40 which has a cylindrical internal space shape and was arrange | positioned so that the perimeter of the outer peripheral surface of the thermal storage part 10 and the heat transport part 30 might be enclosed was mentioned as an example, a heat recovery part 40 has an internal space shape with a C-shaped cross section, and may be disposed so as to surround a part of the outer peripheral surface of the heat storage unit 10 and the heat transport unit 30.

  Moreover, although the heat storage part 10 and the heat transport part 30 gave the example which has a cylindrical shape in the said embodiment, the heat storage part 10 and the heat transport part 30 may have other shapes, such as prismatic shape. .

  Furthermore, in the said embodiment, although the heat storage apparatus provided with the heat storage part 10 and 12 with which the metal oxide was filled was mentioned as an example, if the heat storage apparatus can store heat using exhaust heat, it will be another chemical heat storage agent. May be provided, or a heat storage part using sensible heat storage or latent heat storage may be provided.

  In the above embodiment, an example in which an electric valve 33 is provided in the reflux path 32 has been described. However, the valve 33 is operated by the internal pressure of the heat pipe device, and is closed when the internal pressure is increased. It may be a diaphragm type internal pressure operation valve that prevents the recirculation of the gas.

  Furthermore, in the above-described embodiment, the cooling water of the engine 100 is taken as an example of the heating target.

  In the fourth embodiment, the heat storage unit 12 and the heat transport unit 35 are alternately stacked in the exhaust flow direction. However, the heat storage unit 12 and the heat transport unit 35 are arranged in a horizontal direction substantially perpendicular to the exhaust flow direction. You may laminate in the direction. In this case, for example, if the heat storage section 12, the heat transport section 35, and the exhaust flow path are alternately stacked, the piping through which the exhaust gas passes through the heat storage section 12 and the heat transport section 35 can be omitted. The configuration is simplified.

  Furthermore, in the said embodiment, although the vehicle thermal storage apparatus mounted in the vehicle provided with the water cooling type engine 100 was mentioned as an example, the thermal storage apparatus of this invention is a vehicle provided with the air cooling type engine, or other than a vehicle It is also applicable to.

It is a figure which shows typically the structure of the thermal storage apparatus in 1st Embodiment. It is a figure which shows typically the cross-sectional structure which cut | disconnected the heat transport part vicinity of the thermal storage apparatus in 1st Embodiment perpendicularly | vertically to the exhaust distribution direction. It is a figure which shows typically the structure of the heat storage apparatus in 2nd Embodiment. It is a figure which shows typically the cross-sectional structure which cut | disconnected the evaporation condensation part vicinity of the thermal storage apparatus in 2nd Embodiment perpendicularly | vertically with respect to the exhaust distribution direction. It is a figure which shows typically the structure of the heat storage apparatus in 3rd Embodiment. It is a figure which shows typically the structure of the heat storage apparatus in 4th Embodiment.

Explanation of symbols

1, 2, 3, 4 Heat storage device 10, 12 Heat storage unit 11 Chemical heat storage agent 20, 50 Evaporation condensing unit 30, 35 Heat transport unit 31 Steam channel 32 Recirculation channel 40 Heat recovery unit 41 Heat recovery heat exchanger 53 Heat transfer Fin 100 engine (internal combustion engine)
110 Exhaust passage

Claims (7)

A heat storage section (10) that is provided in an exhaust passage (110) that discharges the exhaust of the internal combustion engine (100) to the outside and stores heat using the heat of the exhaust;
Heat transport that is provided in the exhaust passage (110) and is thermally connected to the heat storage section (10) and evaporates a heat transport medium enclosed therein by heat transfer from the exhaust or the heat storage section (10). Part (30);
A heat recovery unit (40) for heating the object to be heated by heat exchange with the heat transport medium evaporated in the heat transport unit (30), and condensing the heat transport medium and returning it to the heat transport unit (30); Have
The said heat recovery part (40) is arrange | positioned so that the circumference | surroundings of the said heat storage part (10) and the said heat transport part (30) may be enclosed, The heat storage apparatus characterized by the above-mentioned.   The said heat recovery part (40) has a cylindrical shape surrounding the perimeter of the said heat storage part (10) and the said heat transport part (30), The heat storage apparatus of Claim 1 characterized by the above-mentioned. . The heat storage part (10) has a structure filled with a chemical heat storage agent (11) in which an exothermic / endothermic reaction is performed reversibly,
An evaporation condensing unit (50) that contains a reaction medium used for the exothermic / endothermic reaction, sends the evaporated reaction medium to the heat storage unit (10), and condenses the reaction medium flowing in from the heat storage unit (10). )
The said evaporative condensation part (50) is arrange | positioned so that the circumference | surroundings of the said thermal storage part (10) and the said heat transport part (30) may be enclosed together with the said heat recovery part (40). Item 3. A heat storage device according to item 1 or 2.   The heat storage device according to claim 3, wherein the evaporative condensing unit (50) and the heat storage unit (10) are thermally connected to each other.   The heat storage device according to claim 4, further comprising a heat transfer fin (53) that promotes heat transfer between the evaporative condensation unit (50) and the heat storage unit (10).   The said heat-transfer fin (53) is provided in the lower part side of the said evaporative condensation part (50), The heat storage apparatus of Claim 5 characterized by the above-mentioned.   The heat storage device according to any one of claims 1 to 6, wherein the heat storage unit (12) and the heat transport unit (35) are alternately stacked.

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