Heat storage device, power generator, and heat generator

Abstract

To provide a heat storage device that can reduce energy loss, and to provide a power generator and a heat generator.SOLUTION: A heat storage device includes: a ceramic part in which a closed space is formed; a latent heat storage body installed inside the closed space; an electrical heating body installed inside the ceramic part to heat the latent heat storage body; a heat insulation member for covering the ceramic part; and an electrical power supply part for supplying electrical power to the electrical heating body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a heat storage device, a power generation device, and a heat generation device. [Background technology]

[0002] Conventionally, an Al-Si alloy or the like has been used as a phase change material (PCM), and a latent heat storage medium has been proposed in which the PCM is surrounded by a protective layer.

[0003] Also, a heat storage device has been proposed in which a heat storage body is heated by using heated air. In heat storage using this heat storage device, for example, air is heated by using electric power, and the heat storage body is heated by the heated air. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-031507 [Patent Document 2] JP 2015-048393 A Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional heat storage devices, there is a large loss of energy from electricity to heat storage.

[0006] An object of the present disclosure is to provide a heat storage device, a power generation device, and a heat generation device that can reduce energy loss. [Means for solving the problem]

[0007] According to one embodiment of the present disclosure, there is provided a heat storage device having a ceramic part in which a closed space is formed, a latent heat storage body provided within the closed space, an electric heater provided within the ceramic part for heating the latent heat storage body, an insulating member covering the ceramic part, and a power supply unit for supplying power to the electric heater. Effect of the Invention

[0008] According to the disclosed technology, energy loss can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view illustrating a heat storage device according to a first embodiment. [Diagram 2] FIG. 2 is a perspective cross-sectional view illustrating a heat storage module according to the first embodiment. [Diagram 3] FIG. 2 is a diagram illustrating a latent heat storage body and an electric heat body in the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of an arrangement of latent heat storage materials in the first embodiment. [Diagram 5] FIG. 4 is a diagram illustrating loss in the first embodiment. [Figure 6] FIG. 4 is a diagram illustrating a latent heat storage body, an electric heat body, and a thermocouple in a first modified example of the first embodiment. [Figure 7] 13 is a perspective cross-sectional view illustrating a heat storage module according to a second modified example of the first embodiment. FIG. [Figure 8] FIG. 6 is a cross-sectional view illustrating a power generating device according to a second embodiment. [Figure 9] FIG. 11 is a diagram illustrating losses in the second embodiment. [Figure 10] 11 is a cross-sectional view illustrating a heating device according to a third embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are denoted by the same reference numerals, and redundant description may be omitted.

[0011] (First embodiment) First, a first embodiment will be described. The first embodiment relates to a heat storage device. FIG. 1 is a cross-sectional view illustrating a heat storage device according to the first embodiment. FIG. 2 is a perspective cross-sectional view illustrating a heat storage module in the first embodiment. FIG. 3 is a diagram illustrating a latent heat storage body and an electric heat body in the first embodiment. FIG. 4 is a diagram illustrating an example of an arrangement of the latent heat storage body in the first embodiment.

[0012] As shown in Fig. 1, the heat storage device 1 according to the first embodiment includes a heat storage module 20 and a heat insulating member 10. For example, a plurality of heat storage modules 20 are stacked on top of each other.

[0013] The thermal storage module 20 has a ceramic part 22, a latent heat storage body 24, and an electric heat body 26. A plurality of closed spaces 28 are formed in the ceramic part 22. The ceramic part 22 is, for example, integrally constructed. For example, the ceramic part 22 does not have a joint connected to the closed space 28. The latent heat storage body 24 is provided in the closed space 28. In other words, the latent heat storage body 24 is sealed in the ceramic part 22. It can also be said that the latent heat storage body 24 is airtightly covered by the ceramic part 22, which is a continuous body. The ceramic part 22 has a function of preventing leakage of the molten latent heat storage body 24. The latent heat storage body 24 has a columnar shape, such as a cylindrical shape. The latent heat storage body 24 is provided in each of the closed spaces 28. That is, a plurality of latent heat storage bodies 24 are provided in the ceramic part 22. The plurality of latent heat storage bodies 24 are arranged with their major axes parallel to each other. As shown in FIG. 4, the multiple latent heat storage bodies 24 are densely arranged in, for example, a regular triangular lattice pattern.

[0014] The latent heat storage material 24 is made of, for example, a metal. The latent heat storage material 24 contains, for example, aluminum, copper, silicon, or boron, or any combination thereof.

[0015] The main component of the latent heat storage material 24 may be aluminum. The latent heat storage material 24 may contain aluminum at a ratio of 99% by mass or more. In other words, the latent heat storage material 24 may be made of aluminum with a purity of 99% by mass or more.

[0016] The main component of the latent heat storage material 24 may be copper. The latent heat storage material 24 may contain copper at a ratio of 99% by mass or more. In other words, the latent heat storage material 24 may be made of copper with a purity of 99% by mass or more.

[0017] The main component of the latent heat storage body 24 may be silicon. The latent heat storage body 24 may contain silicon at a ratio of 50% by mass or more. The latent heat storage body 24 may be made of silicon with a purity of 50% by mass or more. Preferably, the latent heat storage body 24 contains silicon at a ratio of 99% by mass or more and is made of silicon at a ratio of 99% by mass or more. The latent heat storage body 24 may contain boron (B), aluminum (Al), bismuth (Bi), antimony (Sb), gallium (Ga), copper (Cu), iron (Fe), titanium (Ti), yttrium (Y), indium (In), zinc (Zn), or tin (Sn), or any combination thereof, at a total ratio of less than 50% by mass.

[0018] The main component of the latent heat storage body 24 may be boron. The latent heat storage body 24 may contain boron at a ratio of 50% by mass or more. The latent heat storage body 24 may be composed of boron with a purity of 50% by mass or more. Preferably, the latent heat storage body 24 contains 80% by mass or more of boron and is composed of 80% by mass or more of boron. More preferably, the latent heat storage body 24 contains 99% by mass or more of boron and is composed of 99% by mass or more of boron. The latent heat storage body 24 may contain silicon (Si), aluminum (Al), iron (Fe), copper (Cu), cobalt (Co), or any combination thereof at a ratio of less than 20% by mass in total.

[0019] When the main component of the latent heat storage material 24 is aluminum, the ceramic portion 22 contains, for example, aluminum oxide (Al2O3) at a ratio of 96 mass% or more. In other words, the ceramic portion 22 may be made of aluminum oxide with a purity of 96 mass% or more.

[0020] When the main component of the latent heat storage material 24 is copper, the ceramic portion 22 contains, for example, aluminum oxide at a ratio of 90 mass% or more, mullite (3Al2O3·2SiO2) at a ratio of 90 mass% or more, aluminum nitride (AlN) at a ratio of 95 mass% or more, or a mixture of aluminum nitride and boron nitride (BN) at a ratio of 95 mass% or more. The ceramic portion 22 may further contain a sintering aid or the like. Examples of the sintering aid include silicon, magnesium, and calcium. The particle size of the ceramic grains contained in the ceramic portion 22 is preferably 1 μm or less, and more preferably 0.3 μm or less.

[0021] When the main component of the latent heat storage material 24 is silicon, the ceramic portion 22 contains, for example, mullite, aluminum oxide (Al2O3), cordierite (2MgO·2Al2O3·5SiO2), anorthite (CaAl2Si2O8), sillimanite (Al2SiO5), silicon nitride (Si3N4), boron nitride, aluminum nitride, a composite material of aluminum nitride and boron nitride (composite ceramic), silicon carbide (SiC), tungsten carbide (WC), boron carbide (B4C), molybdenum disilicide (MoSi2), or tungsten disilicide (WSi2), or any combination thereof. Ceramic portion 22 may be composed of mullite, aluminum oxide, cordierite, anorthite, sillimanite, silicon nitride, boron nitride, aluminum nitride, a composite of aluminum nitride and boron nitride, silicon carbide, tungsten carbide, boron carbide, molybdenum disilicide, or tungsten disilicide, or any combination thereof.

[0022] When the main component of the latent heat storage medium 24 is boron, the ceramic portion 22 may contain boron nitride (BN), boron carbide (BC), aluminum nitride (AlN), a composite material of aluminum nitride and boron nitride, silicon nitride (SiN), silicon carbide (SiC), or any combination thereof. The ceramic portion 22 may be composed of boron nitride, boron carbide, aluminum nitride, a composite material of aluminum nitride and boron nitride (composite ceramic), silicon nitride, silicon carbide, or any combination thereof.

[0023] When the main component of the latent heat storage medium 24 is boron, the ceramic portion 22 may contain a boride. The ceramic portion 22 may be made of a boride. The boride may be, for example, titanium boride (TiB2), zirconium boride (ZrB2), hafnium boride (HfB2), vanadium boride (VB2), niobium boride (NbB2), tantalum boride (TaB2), or lanthanum boride (LaB6), or any combination thereof.

[0024] The electric heater 26 is provided in the ceramic part 22. The electric heater 26 is provided between the surface of the ceramic part 22 and the surface of the latent heat storage body 24. The electric heater 26 generates Joule heat when electricity is applied. The electric heater 26 has a substantially cylindrical shape around each latent heat storage body 24. When viewed from a direction parallel to the long axis of the columnar latent heat storage body 24, the electric heater 26 forms a spiral, for example, by alternately rotating clockwise and counterclockwise. The electric heater 26 can heat the latent heat storage body 24. In order to reduce heat loss, it is preferable that the distance between the electric heater 26 and the latent heat storage body 24 is small. The electric heater 26 contains, for example, tungsten or molybdenum, or both. The electric heater 26 may contain a mixture of tungsten and aluminum oxide, or a mixture of molybdenum and aluminum oxide. In this case, the electric heating element 26 may further contain one or more of silicon oxide, magnesium oxide, calcium carbonate, etc. The electric heating element 26 is an example of a heater.

[0025] The heat insulating member 10 has a main body 11, an openable and closable shutter 14, a first terminal 16, a second terminal 17, and a lid 18. The heat insulating member 10 covers a stack of multiple heat storage modules 20. The heat insulating member 10 covers the ceramic parts 22 of each of the multiple heat storage modules 20.

[0026] A stack of heat storage modules 20 is housed in the main body 11, and the shutter 14 is provided so as to contact a surface 20A of one of the heat storage modules 20. When the shutter 14 is closed, the surface 20A is covered by the shutter 14, and when the shutter 14 is open, a portion of the surface 20A is exposed from the shutter 14. The heat insulating member 10 has an opening 12 formed therein, which leads to a portion of the surface 20A exposed from the shutter 14 when the shutter 14 is open.

[0027] The main body 11 and the shutter 14 are made of the same type of heat insulating material, for example. The main body 11 and the shutter 14 are made of a material capable of suppressing heat conduction and heat radiation, which are heat transfer elements. For example, a porous material made of a solid material with low thermal conductivity is used. The size of the pores is preferably large enough to suppress the effects of gas convection, and the pores are preferably filled with a gas with low thermal conductivity at as low a pressure as possible. The heat insulating member 10 is configured to hold the stack of heat storage modules 20 in a vacuum, and a reflective layer may be provided at the boundary between the main body 11 and the shutter 14.

[0028] The first terminal 16 and the second terminal 17 are provided in a recess 13 formed in the main body 11. The first terminal 16 and the second terminal 17 are electrically connected to the heating element 26. For example, the first terminal 16 is a positive terminal, and the second terminal 17 is a negative terminal.

[0029] The lid 18 closes the recess 13. The lid 18 is made of the same material as the main body 11 and the shutter 14, for example.

[0030] When storing heat in the heat storage device 1, the shutter 14 is closed, the lid 18 is removed, and the power supply cable is connected to the first terminal 16 and the second terminal 17. Then, power is supplied from the power supply cable to the electric heater 26, causing the electric heater 26 to generate heat. The heat generated by the electric heater 26 is stored in the latent heat storage body 24. That is, when the latent heat storage body 24 is heated to a temperature higher than the phase change temperature of the solid-liquid, the latent heat accompanying the phase change is stored in the latent heat storage body 24. After the supply of power, the power supply cable is removed from the first terminal 16 and the second terminal 17, and the lid 18 is attached to the recess 13. As a result, the heat stored in the latent heat storage body 24 is held in the latent heat storage body 24 by the ceramic part 22 and the heat insulating member 10.

[0031] When utilizing the heat stored in the heat storage device 1, the shutter 14 is opened with the lid 18 attached. As a result, the heat stored in the latent heat storage material 24 flows out through the open portion of the shutter 14 and the opening 12. This heat can be utilized for power generation or heating such as space heating.

[0032] According to the first embodiment, it is possible to reduce the energy loss from electric power to heat storage. For example, when heat storage is performed using surplus electric power, the surplus electric power is directly supplied to the electric heater 26 as shown in FIG. 5. The heat generated by the electric heater 26 is stored in the latent heat storage material 24, and at that time, heat transfer loss may occur. For example, the ceramic part 22 or the heat insulating member 10 may be heated, and a part of the heat may be released to the outside of the heat storage device 1. However, it is only in this part that heat transfer loss occurs. FIG. 5 is a diagram illustrating an example of loss in the first embodiment.

[0033] On the other hand, when surplus electricity is used to heat air and the heated air is used to heat a latent heat storage material, heat transfer losses occur when the air is heated, heat transfer losses occur during the transportation of the heated air, and heat transfer losses also occur when the heated air is used to heat the latent heat storage material.

[0034] In this way, according to the heat storage device 1 of the first embodiment, it is possible to reduce the energy loss from electricity to heat storage, compared to a heat storage device in which heated air is used to heat the heat storage body.

[0035] Moreover, the latent heat storage material 24 can store a large amount of heat compared to a sensible heat storage material. For example, aluminum can store about twice as much heat per unit mass as a sensible heat storage material, depending on the specific heat of the sensible heat material used. Also, the heat of fusion of silicon per unit mass is four times or more than that of aluminum, and the heat of fusion of boron is eleven times or more than that of aluminum, so that a larger amount of heat can be stored. In this way, by using the latent heat storage material 24, a higher energy storage density can be obtained than that of a lithium ion battery. Therefore, the heat storage device 1 can store a large amount of energy in a small size.

[0036] (First Modification of the First Embodiment) A first modified example of the first embodiment will be described. The first modified example differs from the first embodiment in that a thermocouple is provided. Fig. 6 is a diagram illustrating a latent heat storage body, an electric heat body, and a thermocouple in the first modified example of the first embodiment.

[0037] In the first modification, as shown in Fig. 6, a thermocouple 30 is provided in the heat storage module 20. The thermocouple 30 has a first conductor 31 and a second conductor 32. One end of the first conductor 31 and one end of the second conductor 32 are connected. The first conductor 31 and the second conductor 32 have different thermoelectric powers. For example, the first conductor 31 and the second conductor 32 contain a tungsten-rhenium alloy, the first conductor 31 is made of 5 mass% rhenium and 95 mass% tungsten, and the second conductor 32 is made of 26 mass% rhenium and 74 mass% tungsten.

[0038] The other configuration is similar to that of the first embodiment.

[0039] The first modified example can also provide the same effect as the first embodiment. In addition, since the thermocouple 30 is provided, the state of the latent heat storage body 24 can be easily grasped. For example, in the heat storage process, while the latent heat storage body 24 is solid, the temperature indicated by the thermocouple 30 increases with time, while while the latent heat storage body 24 is changing from solid to liquid, the temperature indicated by the thermocouple 30 is stable. After that, when the phase change is completed, the temperature indicated by the thermocouple 30 increases again with time. Therefore, it is easy to grasp whether the phase change has started, is continuing, or is completed.

[0040] In a heat storage device, even if the latent heat storage material 24 that has completed the phase change and turned into liquid is further heated, the latent heat cannot be stored, and the input energy may be wasted. In contrast, in this embodiment, since the completion of the phase change can be detected using the thermocouple 30, if the heat is stored in another heat storage device 1 after the phase change is completed, the waste of energy can be suppressed.

[0041] (Second Modification of the First Embodiment) A second modified example of the first embodiment will be described. The second modified example differs from the first embodiment in the configuration of the heat storage module. Fig. 7 is a perspective cross-sectional view illustrating a heat storage module in the second modified example of the first embodiment.

[0042] The heat storage device according to the second modification has a heat storage module 60 instead of the heat storage module 20. The heat storage module 60 has a ceramic part 62 and a latent heat storage body 24. A plurality of closed spaces 68 are formed in the ceramic part 62. The ceramic part 62 has a similar configuration to the ceramic part 22 except for the material.

[0043] An example of the material of the ceramic portion 62 is carbide. Carbide includes silicon carbide, tungsten carbide, and boron carbide. Silicon carbide, tungsten carbide, and boron carbide have electrical conductivity, depending on the carbon content. Silicon carbide, tungsten carbide, and boron carbide are materials that generate heat when electricity is applied, and silicon carbide, tungsten carbide, and boron carbide can be used as a heater. When the ceramic portion 62 includes silicon carbide, tungsten carbide, or boron carbide, the ceramic portion 62 has a protection function and a heating function for the latent heat storage body 24, and it is easy to achieve a higher heat storage density.

[0044] An example of the material of the ceramic portion 62 is a silicide. The silicide includes molybdenum disilicide (MoSi2) and tungsten disilicide (WSi2). Molybdenum disilicide and tungsten disilicide are materials that generate heat when electricity is applied. When the ceramic portion 62 includes molybdenum disilicide or tungsten disilicide, the ceramic portion 62 has a protection function and a heating function for the latent heat storage body 24, and it is easy to achieve a higher heat storage density. In addition, in the atmosphere, a dense oxide film of silicon dioxide (SiO2) is formed on the surface of the molybdenum disilicide and tungsten disilicide, and the oxidation inside the molybdenum disilicide and tungsten disilicide is suppressed. Therefore, the ceramic portion 62 including molybdenum disilicide or tungsten disilicide is chemically stable even in the atmosphere.

[0045] In the second modification, power is supplied to the ceramic part 22 from the first terminal 16 and the second terminal 17.

[0046] The other configuration is similar to that of the first embodiment.

[0047] The second modified example can also provide the same effects as the first embodiment.

[0048] Second embodiment A second embodiment will be described. The second embodiment relates to a power generating device including a heat storage device 1. Fig. 8 is a cross-sectional view illustrating the power generating device according to the second embodiment. Fig. 9 is a diagram illustrating losses in the second embodiment.

[0049] 8 and 9, the power generation device 2 according to the second embodiment has a heat storage device 1 and a Stirling engine 40. The Stirling engine 40 has a high-temperature side cylinder 42 equipped with a displacer piston 44, and a low-temperature side cylinder (not shown). The shutter 14 of the heat storage device 1 is open, and the high-temperature side cylinder 42 is in contact with the surface 20A of the heat storage module 20 through the opening 12 and the open portion of the shutter 14.

[0050] In the power generation device 2 according to the second embodiment, the heat storage device 1 stores heat in the same manner as in the first embodiment. The gas in the high-temperature side cylinder 42 absorbs the heat stored in the latent heat storage material 24 through the open shutter 14. Then, the gas in the high-temperature side cylinder 42 thermally expands. As a result, the Stirling engine 40 does work and generates electricity.

[0051] According to the power generation device 2 of the second embodiment, since it has the heat storage device 1, it is possible to reduce the energy loss from the generation of electric power to the storage of heat. In addition, it is possible to reduce the energy loss during power generation using the heat stored in the heat storage device 1. That is, as shown in FIG. 9, heat transfer loss may occur when the heat stored in the latent heat storage material 24 is transferred to the Stirling engine 40, but it is only in this portion that the heat transfer loss occurs. In general, it is said that the energy efficiency of a Stirling engine is higher than that of an internal combustion engine and a steam engine, and the greater the temperature difference between the high-temperature side cylinder and the low-temperature side cylinder, the closer the efficiency becomes to that of the Carnot cycle.

[0052] On the other hand, when air is heated using the heat stored in the latent heat storage material 24, the heated air is used to generate steam, and electricity is generated by rotating a turbine, heat transfer losses occur when the air is heated, heat transfer losses occur during transportation of the heated air, and heat transfer losses also occur when the heated air is used to generate steam.

[0053] Thus, the power generation device 2 according to the second embodiment can reduce energy loss from heat storage to power generation, compared to a power generation device that generates steam using heated air and uses the steam to rotate a turbine to generate power. Therefore, even if it is small, it is possible to obtain high energy efficiency with little heat loss, and for example, the power generation device 2 is suitable for utilizing surplus power from small-scale distributed power generation facilities such as solar power generation facilities and wind power generation facilities.

[0054] Furthermore, since the high-temperature side cylinder 42 is configured to be detachable from the heat storage device 1, the high-temperature side cylinder 42 can be removed during heat storage, thereby preventing heat dissipation through the high-temperature side cylinder 42.

[0055] Third embodiment A third embodiment will be described below. The third embodiment relates to a heat generating device including a heat storage device 1. Fig. 10 is a cross-sectional view illustrating the heat generating device according to the third embodiment.

[0056] As shown in FIG. 10, the heat generating device 3 according to the third embodiment includes a heat storage device 1 and a heat exchanger 50. The heat exchanger 50 includes a housing 58, an internal flow path 52, a first external flow path 54, and a second external flow path 56. The internal flow path 52 is provided inside the housing 58, and the first external flow path 54 and the second external flow path 56 are provided outside the housing 58. The internal flow path 52 has an inlet end and an outlet end, and the first external flow path 54 is connected to the inlet end, and the second external flow path 56 is connected to the outlet end. A heat medium flows through the internal flow path 52, the first external flow path 54, and the second external flow path 56.

[0057] The shutter 14 of the heat storage device 1 is open, and the heat exchanger 50 is in contact with the surface 20A of the heat storage module 20 through the opening 12 and the open portion of the shutter 14.

[0058] In the heat generating device 3 according to the third embodiment, the heat storage device 1 stores heat in the same manner as in the first embodiment. Moreover, the heat medium in the internal flow path 52 absorbs the heat stored in the latent heat storage material 24 through the open shutter 14.

[0059] According to the heat generating device 3 of the third embodiment, since it has the heat storage device 1, it is possible to reduce the energy loss from the power to the heat storage. In addition, it is possible to reduce the energy loss when heat is generated using the heat stored in the heat storage device 1. That is, the heat medium flows from the first external flow path 54 to the internal flow path 52, and the heat medium is heated by the heat storage module 20. Then, the heated heat medium flows out from the internal flow path 52 to the second external flow path 56. When the heat stored in the latent heat storage body 24 is transferred to the heat medium, a heat transfer loss may occur, but the heat transfer loss occurs only in this portion.

[0060] Furthermore, since the heat exchanger 50 is configured to be detachable from the heat storage device 1, the heat exchanger 50 can be removed during heat storage, thereby preventing heat dissipation through the heat exchanger 50.

[0061] The heat generating device 3 can be used, for example, to heat a space inside a house.

[0062] Although preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims. [Explanation of symbols]

[0063] 1 Heat storage device 2. Power generation equipment 3 Heating device 10. Thermal insulation materials 12 Opening 14 Shutter 16 1st terminal 17 2nd terminal 20 Heat storage module 22 Ceramic Section 24 Latent heat storage material 26 Electric Heater 30 Thermocouple 40 Stirling Engine 50 heat exchanger

Claims

1. A ceramic part in which a closed space is formed, A latent heat storage body provided within the aforementioned closed space, A heating element is provided within the ceramic portion to heat the latent heat storage body, A heat insulating member covering the aforementioned ceramic part, A power supply unit that supplies power to the electric heating element, A heat storage device having the following features.

2. A closed space is formed, and a ceramic part containing a material that generates heat when an electric current is passed through it, A latent heat storage body provided within the aforementioned closed space, A heat insulating member covering the aforementioned ceramic part, A power supply unit that supplies power to the ceramic part, A heat storage device having the following features.

3. The heat storage device according to claim 1 or 2, wherein the latent heat storage body contains aluminum, copper, silicon, or boron, or any combination thereof.

4. The heat storage device according to claim 1 or 2, further comprising a thermocouple that generates electricity due to a temperature change of the latent heat storage body.

5. The heat insulating member has an openable and closable shutter that contacts one surface of the ceramic part, When the shutter is closed, the shutter completely covers one surface of the ceramic part. The heat storage device according to claim 1 or 2, wherein when the shutter is open, a portion of one surface of the ceramic part is exposed from the shutter.

6. A heat storage device according to claim 1 or 2, A heat engine that generates electricity using the heat stored in the latent heat storage body, A power generation device having the following features.

7. The aforementioned heat engine is equipped with a cylinder, The power generation device according to claim 6, wherein the gas in the cylinder absorbs the heat stored in the latent heat storage body and undergoes thermal expansion.

8. The aforementioned heat insulating member is configured to be openable and closable. The power generation device according to claim 7, wherein the gas in the cylinder absorbs the heat stored in the latent heat storage body through the open portion of the insulating member.

9. The power generation device according to claim 7, wherein the cylinder is configured to be detachably attached to the heat storage device.

10. A heat storage device according to claim 1 or 2, A heat exchanger equipped with a flow path that transfers the heat stored in the latent heat storage body to a heat transfer medium in the flow path, A heating device having a heating element.

11. The aforementioned heat insulating member is configured to be openable and closable. The heat transfer medium in the flow path absorbs the heat stored in the latent heat storage body through the open portion of the insulating member, as described in claim 10.

12. The heat exchanger is configured to be detachably attached to the heat storage device according to claim 10.

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