JP2008128593A - Heat storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage device capable of efficiently separating a heat storage body and a heat exchange medium, while reducing the volume of the heat exchange medium. <P>SOLUTION: Erythritol 3 and oil 2 are held in a heat storage vessel 1a of the heat storage device 1. Heat storage is carried out in the erythritol 3 by latent heat storage. In the oil 2, heat exchange is carried out by contact with the erythritol 3, and it is separated from the erythritol 3 since its specific gravity is smaller than the erythritol 3. In at least one vertical cross section of the heat storage vessel 1a, a horizontal width of an inner face 1i is smaller in an upper part side than a bottom side, and the heat storage device 1 has a portion with a horizontal width becoming gradually smaller from a bottom side toward the upper part side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat storage device used in a heat transport system that can store generated heat and transport heat to a remote place.

  Heat generated in factories (for example, steelworks, garbage disposal plants, etc.) is used in various facilities near the factories. Moreover, the heat generated in the factory can be temporarily stored in a heat storage body or the like, and the heat storage body can be transported so that the heat can be used even in a place away from the factory.

  Patent Document 1 discloses a technique related to a heat storage device that uses the latent heat of fusion of a heat storage body. A storage container (heat storage container) included in the heat storage device of Patent Document 1 contains a heat storage body such as erythritol and oil (heat exchange medium) having a specific gravity smaller than that of the heat storage body. Since the heat storage body in the heat storage state is in a molten state, the heat storage body is separated from the upper and lower sides without being mixed with oil having a specific gravity smaller than that of the heat storage body. The storage container (heat storage container) is provided with a supply pipe and a discharge pipe through which oil is supplied from the outside and discharged to the outside, and a heat exchanger connected to the supply pipe and the discharge pipe The side pipe is thermally connected to the heat exchanger. Moreover, the heat exchanger side pipe connected to the supply pipe and the discharge pipe communicates with each other inside the heat exchanger.

  And when heat is stored in the storage container (heat storage container), the oil passes through the supply pipe, the discharge pipe and the heat exchanger side pipe, is supplied with heat inside the factory side heat exchanger, and the heat is supplied. Then, it is fed below the heat storage body through the supply pipe. Since the sent oil has a small specific gravity, it rises above the heat storage body. During this rise, heat exchange is performed by direct contact between the heat storage body and the oil, and the heat of the oil is supplied to the heat storage body. By repeating the above operation, heat storage to the heat storage body is performed.

  On the other hand, when recovering and using the heat stored in the heat storage body, oil that is not supplied with heat is sent below the heat storage body. And while the sent-in oil rises in the heat storage body, heat exchange is performed by direct contact between the heat storage body and the oil, and the heat stored in the heat storage body is supplied to the rising oil. And in the heat exchanger provided separately, the heat | fever of the oil supplied with heat as mentioned above can be collect | recovered. By repeating the above operation, the heat stored in the heat storage body can be recovered and used.

Since the storage container (heat storage container) can be transported by a truck or the like, a factory that generates heat and a facility such as a hot water pool that uses the heat are separated from each other. However, heat transport can be performed by transporting the storage container in which the heat storage body in a state where heat is stored is accommodated. In addition, by using the heat stored in the storage container, CO ₂ emission as a global warming gas can be reduced in a facility such as a hot water pool that uses heat.
JP 2005-188916 A

  By the way, the heat storage body has a large amount of heat storage because heat storage is performed using the heat of fusion (the amount of heat necessary to melt 1 kg of solids into a liquid of the same temperature, corresponding to latent heat). As an example of a heat storage body, erythritol has a heat of fusion of 76 kcal / kg. In addition, the specific heat of erythritol (the amount of heat required to raise the temperature of 1 kg of substance by 1 ° C) is about 0.7 kcal / kg ° C. In a heat storage body such as erythritol, both heat of fusion and specific heat are used for heat storage. it can. On the other hand, the heat exchange medium (oil) cannot use heat of fusion for heat storage, and uses only specific heat (0.5 to 0.6 kcal / kg ° C.) to store heat. The contribution is small compared to the contribution to heat storage by the heat storage body.

  Since the heat exchange medium has a small contribution to the heat storage as described above, in order to improve the heat storage density as the whole heat storage device, the content of the heat storage body is increased and the content of the heat exchange medium is decreased. (It is better that the ratio of the heat storage body is higher in the heat storage body and the heat exchange medium). Therefore, it is desirable that the volume of the heat exchange medium is as small as possible.

  In another aspect, it is necessary to reliably separate the heat storage body and the heat exchange medium and prevent the heat storage body from being mixed into the circulating heat exchange medium or the recovered heat exchange medium. Here, when the height of the heat exchange medium in contact with the heat storage medium is low (the heat exchange medium layer is thin), it is difficult to separate the heat storage medium from the heat exchange medium. If the thickness (thickness) is appropriately secured, the heat storage body and the heat exchange medium can be easily and efficiently separated.

  From the above, in the heat storage device, it is desirable that the volume of the heat exchange medium is as small as possible and the height of the heat exchange medium is as high as possible. However, the storage container (heat storage container) disclosed in Patent Document 1 has a rectangular parallelepiped shape, and the vertical cross section of the inner surface of the container has a quadrangular shape. If the volume of the heat exchange medium is reduced, the amount of heat exchange medium increases accordingly. Therefore, the heat storage medium and the heat exchange medium are not efficiently separated from each other.

  Then, the objective of this invention is providing the thermal storage apparatus which can isolate | separate a thermal storage body and a heat exchange medium efficiently, reducing the volume of a heat exchange medium.

Means and effects for solving the problems

  In order to achieve the above object, a heat storage device according to the present invention performs heat exchange by contacting a heat storage body that stores heat by latent heat storage and the heat storage body, and has a smaller specific gravity than the heat storage body and the heat storage body. Has a heat exchange medium to be separated, and a heat storage container that houses the heat storage body and the heat exchange medium, and in at least one vertical section of the heat storage container, the horizontal width of the inner surface of the heat storage container is: The upper side is smaller than the bottom side, and has a portion in which the horizontal width gradually decreases from the bottom side to the upper side.

  According to this configuration, even if the volume of the heat exchange medium is reduced, the height of the heat exchange medium can be increased as compared with the case where the vertical cross section of the heat storage container is a square shape. Therefore, it is possible to efficiently separate the heat storage body and the heat exchange medium while reducing the volume of the heat exchange medium. As a result, the ratio of the heat storage body in the container is improved, the heat storage density of the heat storage device is improved, and the heat storage body is less likely to be mixed into the circulating heat exchange medium or the recovered heat exchange medium. Moreover, since the weight of the heat exchange medium with a small contribution to heat storage can be reduced, the heat transport efficiency is improved even when the heat exchange medium is transported together with the heat storage container.

  The vertical cross section may be a vertical cross section in a direction perpendicular to the longitudinal direction of the heat storage container. According to this, a heat storage body and a heat exchange medium can be more efficiently separated.

  The heat storage container may be formed such that an inner surface thereof has a trapezoidal shape in the vertical cross section. According to this, it is possible to efficiently separate the heat storage body and the heat exchange medium while reducing the volume of the heat exchange medium with a simple shape.

  The heat storage container is formed so that an inner surface thereof has a hexagonal shape having a lower quadrangular portion and an upper trapezoidal portion in the vertical cross section, and the heat storage body and the heat exchange medium The interface between the two may be set to be positioned below the trapezoidal portion. According to this, for the heat exchange medium, the volume of the heat exchange medium can be reduced and the height of the heat exchange medium can be increased. On the other hand, about the heat storage body, the volume of the heat storage body can be increased and the height of the heat storage body can be minimized. Therefore, the heat storage body and the heat exchange medium can be efficiently separated, and the height of the entire heat storage container can be prevented from becoming unnecessarily high. In addition, since the interface is above the quadrangular portion, such an effect is obtained, and the heat exchange efficiency is improved because the flow of the heat exchange medium is not hindered.

  The heat storage container may be formed so as to have a curved portion in a portion where the horizontal width gradually decreases in the vertical cross section. According to this, by having the curved portion, the flow of the heat exchange medium is not hindered, and the heat storage efficiency is improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the heat storage device according to the first embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing an overall configuration of a heat transport system including a heat storage device according to the first embodiment of the present invention.

(overall structure)
The heat storage device according to the present embodiment is applied, for example, when a factory (heat source) 80 that generates heat and a facility (heat utilization mechanism) 85 that uses the heat are separated from each other, as shown in FIG. The First, the outline | summary about the thermal storage to the thermal storage apparatus 1 (thermal storage container 1a) is demonstrated. The heat storage device 1 includes a portable heat storage container 1a that houses a heat storage body and a heat exchange medium (described later). In this case, the heat storage container 1a is detachably connected to the heat exchanger 5a via the connection ports 51 and 52, and the heat storage container 1a in which heat storage has been completed (heat storage has been completed) is the transport mechanism 50 such as a truck. It is mounted on the loading platform 50b and transported from the factory 80 to the facility 85. The factory 80 is specifically an ironworks or the like, and may be a garbage incinerator or a power plant. And the heat | fever discharged | emitted there is stored in the thermal storage container 1a via the heat exchanger 5a and a heat exchange medium. The heat exchanger 5a is for conducting the heat of the factory 80 to a heat exchange medium circulating in the heat exchanger 5a. After the heat storage of one heat storage container 1a is completed, by connecting the connection port of the unheated heat storage container 1a that is waiting to the connection ports 51 and 52 with the heat exchanger 5a, the next non-heat storage state Similarly, heat storage is performed on the heat storage container 1a. In this way, the heat of the factory 80 can be stored in the heat storage container 1a sequentially.

  Next, an outline of utilization of heat stored in the heat storage container 1a (hereinafter referred to as heat dissipation) will be described. In this case, the heat storage container 1a is detachably connected to the heat exchanger 5b via the connection ports 53 and 54, and the heat storage container 1a having completed heat radiation is removed from the facility 85 by the transport mechanism 50 such as a truck. Transported to factory 80. The facility 85 is a facility such as a hot water pool or a hospital, and the heat stored in the heat storage container 1a is dissipated through the heat exchange medium and the heat exchanger 5b, so that it can be applied to the temperature control equipment in the facility 85. Is done. The heat exchanger 5b is for conducting heat accumulated in the heat storage container 1a to the facility 85. After the heat dissipation of one heat storage container 1a is completed, by connecting the connection port of the next heat storage container 1a that is waiting next to the connection ports 53 and 54 with the heat exchanger 5b, in the facility 85, Heat can be used. Thus, in the facility 85, the heat stored in the heat storage container 1a can be radiated and used.

(About heat storage device)
Next, a specific configuration of the heat storage device 1 will be described with reference to FIGS. FIG. 2 is a vertical cross-sectional schematic diagram showing the heat storage side of the heat transport system including the heat storage device 1. In FIG. 2, the factory 80 is omitted. 3 is a schematic cross-sectional view of the heat storage device 1 of FIG. 2, wherein (a) shows a vertical cross-section in the longitudinal direction, and (b) shows a cross-section at the position of line AA ′ in (a). Show.

  As shown in FIGS. 2 and 3, the heat storage device 1 includes a heat storage container 1 a, a supply pipe 4, and a discharge pipe 6.

(Heat storage container)
First, the configuration of the heat storage container 1a will be described. During heat storage and heat dissipation, oil (heat exchange medium) 2 and erythritol (heat storage body) 3 are accommodated in the heat storage container 1a. Further, the heat storage container 1a is provided with a supply pipe 4 and a discharge pipe 6 in communication with the inside of the heat storage container 1a (details will be described later). Then, the heat exchanger side pipe passing through the inside of the heat exchanger side, the supply pipe 4 and the discharge pipe 6 are connected, and the oil 2 as the heat exchange medium passes through the inside of the heat storage container 1a and the inside of the heat exchanger. It can be circulated while going through. Further, the heat storage container 1a can be transported by the transport mechanism 50 in a state where the supply pipe 4 and the discharge pipe 6 are attached to the heat storage container 1a. In the present embodiment, the supply pipe 4 and the discharge pipe 6 are installed through the heat storage container 1a. However, for example, the supply pipe and the discharge pipe are inserted into the heat storage container only during heat storage and heat dissipation and transported. In some cases, the supply pipe and the discharge pipe may be removed.

  The shape of the heat storage container 1a is as shown in FIG. That is, the heat storage container 1a is composed of a plurality of plate-like members that constitute a bottom portion, an upper portion, and four side portions. And in the vertical cross section (refer FIG.3 (b)) of the thermal storage container 1a, the horizontal direction width | variety of the inner surface 1i of the thermal storage container 1a is an upper side (FIG. 3) rather than the bottom part side (refer Wa of FIG.3 (b)). (See Wb of (b)) is smaller. Furthermore, the heat storage container 1a has a portion in which the horizontal width of the inner surface 1i gradually decreases (not stepwise) from the bottom side to the top side in the vertical cross section (see the P1 portion in FIG. 3B). . Further, the heat storage container 1a is formed to have a trapezoidal shape in FIG.

  Moreover, in this embodiment, in FIG.3 (b) which is a vertical direction cross section about a direction perpendicular | vertical to a longitudinal direction (refer arrow direction of Fig.3 (a)) among the vertical direction cross sections of the heat storage container 1a, The horizontal width of the inner surface 1i of the container 1a is smaller on the upper side than on the bottom side. However, in at least one vertical section of the heat storage container (among countless vertical sections), the horizontal width of the inner surface of the heat storage container should be smaller on the upper side than on the bottom side, For example, as in the heat storage container 601a according to the modification of FIG. 9, in FIG. 9A, which is a vertical cross section in the longitudinal direction of the heat storage container 601a, the horizontal width of the inner surface 601i of the heat storage container 601a is smaller than the bottom side. Also, the upper side may be configured to be smaller. Further, in both the vertical cross section in the longitudinal direction of the heat storage container and the vertical cross section in the direction perpendicular to the longitudinal direction of the heat storage container, the horizontal width of the inner surface of the heat storage container is higher than the bottom side. It may be configured to be smaller (the shape may have a cross section of both FIG. 3B and FIG. 9A).

  And as a result of the heat storage container 1a being configured as described above, in the state where the oil 2 and erythritol 3 are accommodated in the heat storage container 1a, the vertical direction of the heat storage container 1a in the vertical cross section. In the region of the oil 2 (see Ha in FIG. 3B), the horizontal width of the inner surface 1i of the heat storage container 1a is smaller than the bottom side (see Wa).

(Supply pipe)
Next, the supply pipe 4 will be described. The supply pipe 4 is provided so as to penetrate from the outside to the inside of the heat storage container 1a. The supply pipe 4 is attached to the heat storage container 1a in the upper layer portion of the heat storage container 1a where the stored oil 2 is located, and crosses the boundary surface (interface) between the oil 2 and erythritol 3 vertically downward. The erythritol 3 is formed so as to enter the erythritol 3 and bend into an L shape and extend in the horizontal direction. That is, the supply pipe 4 is disposed so as to come into contact with the erythritol 3 at the distal end portion. The supply pipe 4 has an internal space, and the oil 2 supplied with heat to the heat exchanger 5a circulates through the internal space. Moreover, as shown in FIG.3 (b), the supply pipe | tube 4 is formed in the shape of a pipe, and about the front-end | tip part, multiple (four) are arrange | positioned. In addition, a plurality of tip portions of the supply pipe 4 are provided in this way, but the connection port 41 and the end portion 4m may be provided only one so as to be commonly used for the plurality of tip portions. Alternatively, a plurality of tip portions may be branched from one end portion 4m, or a plurality of tip portions may be provided corresponding to the plurality of tip portions.

  Each of the plurality of tip portions of the supply pipe 4 has a plurality of discharge holes 4h along the axial direction, and the oil 2 flowing through the supply pipe 4 is discharged from the discharge holes 4h. A discharge hole 4h provided in a portion of the supply pipe 4 that is bent in an L shape and extends horizontally is provided so as to open upward.

  The arrangement of the discharge holes is not limited to this. In the present embodiment, as shown in FIGS. 3A and 3B, a pipe-like supply pipe 4 is used as a heat exchange medium supply mechanism. The heat storage device 501 according to the modification of FIG. 8 is not limited to a rectangular shape, but is a rectangular parallelepiped shape (box shape) having an internal space through which the oil 2 flows, and a plurality of discharge ports 504h are provided on the surface. It may be a supply mechanism 504 having a supply part (tip part) 504t.

(Discharge pipe)
Next, the discharge pipe 6 will be described. The discharge pipe 6 is also provided penetrating from the outside to the inside of the heat storage container 1a. The discharge pipe 6 is attached to the heat storage container 1a in the upper layer portion of the heat storage container 1a where the stored oil 2 is located, and the oil 2 in the heat storage container 1a passes through the discharge pipe 6 to the outside of the heat storage container 1a. Discharged. Further, the discharge pipe 6 is arranged so as to come into contact with the oil 2, and the oil 2 inside the heat storage container 1 a is taken into the discharge pipe 6 from a discharge port 6 h provided at the tip of the discharge pipe 6. ing.

  In addition, as shown in FIG. 2, during heat storage, the connection port 41 of the supply pipe 4 is detachably connected to the connection port 51 with the heat exchanger side pipe 8a, and the connection port 61 of the discharge pipe 6 is heat exchanged. It will be in the state connected detachably to the connection port 52 with the container side pipe 7a.

(Heat exchange medium (oil))
The oil 2 used as a heat exchange medium in this embodiment performs heat exchange with the erythritol 3 by direct contact. First, at the time of heat storage, the oil 2 passes through the discharge pipe 6 and the heat exchanger side pipe 7a, is supplied with heat in the heat exchanger 5a, and then is discharged into the erythritol 3 through the pipe 8a and the supply pipe 4 ( In the following description, the oil 2 supplied with heat by the heat exchanger 5a during heat storage is particularly referred to as oil 2a, and the oil 2 supplied with heat from the erythritol 3 during heat dissipation as particularly oil 2b). Since the released oil 2 a has a specific gravity smaller than that of erythritol 3, it rises to the position of the upper oil 2 and is taken into the oil 2. During this rise, the heat of the oil 2 a is conducted to the erythritol 3 by direct contact with the erythritol 3.

  Further, at the time of heat dissipation, the oil 2 passes through the discharge pipe 6 and the heat exchanger side pipe, and is released into the erythritol 3 through the supply pipe 4 after heat dissipation in the heat exchanger 5b (see FIG. 1). Since the released oil 2 (after heat dissipation) has a specific gravity smaller than that of erythritol 3, the oil 2 rises to the position of the upper oil 2 and is taken into the oil 2. During this rise, the heat stored in the erythritol 3 is conducted to the oil 2 by direct contact with the erythritol 3.

(Heat storage body (erythritol))
The erythritol 3 stores the heat conducted from the oil 2a when storing heat. Moreover, at the time of heat dissipation, heat is conducted to the oil 2 after heat dissipation. The melting point of erythritol 3 is about 121 degrees, and it is a solid during normal times (at room temperature). Then, heat is conducted from the oil 2a by direct contact, so that the state changes from solid to liquid, and heat is stored in the liquid state. That is, erythritol 3 stores heat using latent heat storage. On the other hand, since erythritol 3 dissipates heat when the state changes from liquid to solid, heat can be taken out. Here, since the heat of fusion is as high as 76 kcal / kg, erythritol is desirable as a heat storage body because of its large heat storage amount. Here, erythritol is used, but as the heat accumulator, those having a large heat of fusion (latent heat) such as sodium acetate (heat of fusion: 63 kcal / kg), sugar alcohols and the like can be used.

(Oil and erythritol)
The oil 2 and the erythritol 3 are not mixed with each other, and the oil 2 has a specific gravity smaller than that of the erythritol 3, so that the oil 2 is accommodated in the heat storage container 1a so that the oil 2 is an upper layer and the erythritol 3 is a lower layer. In addition, since the oil 2 and the erythritol 3 are not mixed with each other, no member or the like is provided between the oil 2 and the erythritol 3 so that the oil 2 and the erythritol 3 are in direct contact with each other. .

(Heat exchanger)
As shown in FIGS. 1 and 2, the heat exchanger 5 a on the heat storage side is for conducting heat generated in the factory 80 to the oil 2. The connection ports 41 and 61 of the supply pipe 4 and the discharge pipe 6 are detachably connected to the heat exchanger side pipes 8a and 7a at the connection ports 51 and 52, respectively. The heat exchanger side pipes 8a and 7a are configured to communicate with each other inside the heat exchanger 5a. Then, the oil 2 inside the heat storage container 1a is taken into the heat exchanger 5a from the heat storage container 1a side. On the other hand, a heat medium such as high-temperature steam or air discharged from the factory 80 is sent into the heat exchanger 5a. And the heat exchanger side pipes 7a, 8a through which the taken-in oil 2 circulates and the pipe through which the heat medium circulates are provided so as to contact each other inside the heat exchanger 5a, and these Since the pipe is formed of a member having high thermal conductivity, the heat of the heat medium is indirectly conducted to the oil 2 through the wall of the pipe. Thus, the heat sent through the heat medium such as steam or air is conducted to the oil 2 flowing through the heat exchanger side pipes 7a and 8a by heat exchange in the heat exchanger 5a. . The heat medium such as steam from which heat has been removed by the heat exchanger side pipes 7 a and 8 a and the oil 2 is returned to the factory 80 again. Therefore, it can be said that the factory (heat source) 80 and the heat exchanger side pipes 7a and 8a are thermally connected.

  Moreover, the heat exchanger 5b on the heat radiation side is for transmitting the heat stored in the heat storage container 1a to the facility 85. And like the heat storage side, the connection ports 41 and 61 of the supply pipe 4 and the discharge pipe 6 are detachably connected to the heat exchanger side pipe at the connection ports 53 and 54, respectively. The heat exchanger side pipe is configured to communicate with the inside of the heat exchanger 5b. And the oil 2b supplied with the heat stored in the erythritol 3 of the heat storage container 1a is taken into the heat exchanger 5b from the heat storage container 1a side. On the other hand, a heat medium for conducting heat to the facility 85 is taken into the heat exchanger 5b from the facility 85 side. Here, the heat exchanger side pipe through which the taken-in oil 2b circulates and the pipe through which the heat medium circulates are provided so as to be in contact with each other inside the heat exchanger 5b. Since it is formed of a member having high thermal conductivity, the heat of the oil 2b is indirectly conducted to the heat medium through the wall of the pipe. And the heat medium given heat by such heat exchange is returned to the facility 85 through the pipe. From the above, it can be said that the facility 85 and the heat exchanger side pipe are thermally connected.

(Each process in the heat transport system)
Next, each process of heat storage, transportation, and heat dissipation by the heat transport system will be described.

(Heat storage)
First, in the heat storage process, heat storage to the heat storage container 1a is performed. At this time, the heat storage container 1a is in a state where oil 2 as a heat exchange medium is injected and supplied in advance. In the heat storage process, heat discharged as steam from the factory 80 is conducted to the oil 2 in the heat exchanger 5a.

  Then, the heat-supplied oil 2a passes through the heat exchanger side pipe 8a and the supply pipe 4 and is supplied from the discharge hole 4h to the lower layer portion of the heat storage container 1a where the erythritol 3 is located. Here, since the specific gravity of the oil 2a is smaller than that of the erythritol 3, when the oil 2a is introduced into the lower layer portion of the heat storage container 1a from the discharge hole 4h, the upper layer part of the heat storage container 1a is in direct contact with the erythritol 3 Rise to. At this time, the heat of the oil 2a is supplied to the erythritol 3 because the erythritol 3 is in direct contact with the hot oil 2a.

  The oil 2 that has supplied heat to the erythritol 3 flows into the discharge pipe 6 from the discharge port 6h. And the oil 2 distribute | circulates the inside of the discharge pipe 6 and the heat exchanger side pipes 7a and 8a, and the heat | fever discharged | emitted from the factory 80 there is conducted to the oil 2, and heat is supplied. In the heat storage process, heat storage is performed as described above.

  Next, it is determined whether or not the heat storage in erythritol 3 is completed. Specifically, for example, a method of determining the average temperature of erythritol 3 and determining that the heat storage is completed when the average temperature exceeds a certain reference value can be considered. Other determination methods may be used. Thereby, if heat storage is not yet completed, a heat storage process is repeated again. Thus, by repeating the heat storage process, the heat generated in the factory 80 can be sufficiently stored in the heat storage container 1a. On the other hand, if it is determined that the heat storage has been completed, the heat storage process ends and the next process is performed.

(Heat transport)
Next, in the transport process, the heat storage container 1a is transported. This is performed by a transport mechanism 50 such as a truck equipped with a heat storage container 1a that has completed heat storage. The heat storage container 1a is transported from the factory 80 to a facility 85 where heat is used. Here, the transport mechanism 50 is not limited to a land traveling vehicle such as a truck, and may be a ship or an aircraft. Further, the heat storage container 1a is transported after the connection at the connection ports 51 and 52 is released. As described above, heat storage and transportation of the heat storage container 1a are performed. Here, as will be described later, by reducing the content of the oil 2 that has a small contribution to the heat storage in the heat storage container 1a, the weight of the heat storage container 1a is reduced as compared with the case where the oil 2 is contained in a large amount. Increases transportation efficiency.

(Heat dissipation)
Next, in the heat dissipation process, the heat stored in the heat storage container 1a is collected and used in the facility 85. First, in the connection ports 53 and 54, the heat exchanger side pipe and the heat storage container 1a carried into the facility 85 by the transportation process are connected.

  The heat stored in the heat storage container 1a is released. That is, in the facility 85, the heat of the heat storage container 1a is used. In the heat dissipation process, the heat stored in the heat storage container 1a is conducted to the facility 85 through the heat exchanger 5b.

  Then, the oil 2 after the heat supply passes through the heat exchanger side pipe 8a and the supply pipe 4 and is supplied from the discharge hole 4h to the lower layer portion of the heat storage container 1a where the erythritol 3 is located. Here, since the specific gravity of the oil 2 is smaller than that of the erythritol 3, when the oil 2 is introduced into the lower layer portion of the heat storage container 1a from the discharge hole 4h, the upper layer part of the heat storage container 1a is in direct contact with the erythritol 3 Rise to. At this time, the high-temperature erythritol 3 is in direct contact with the oil 2, whereby the heat of the erythritol 3 is supplied to the oil 2.

  The oil 2b supplied with heat from the erythritol 3 flows into the discharge pipe 6 through the discharge port 6h. And it is sent to the discharge pipe 6 and the heat exchanger side pipe 7a, where heat is conducted from the oil 2b to the facility 85, and the heat of the heat storage container 1a is utilized in the facility 85. In the heat dissipation step, heat dissipation is performed as described above.

  Next, it is determined whether or not heat dissipation has been completed. Specifically, for example, a method of monitoring the average temperature of erythritol 3 or the like, and determining that the heat dissipation is completed when the average temperature falls below a certain reference value is conceivable. Other determination methods may be used. Thereby, if heat dissipation is not yet completed, a heat storage process is repeated again. Thus, the heat stored in the erythritol 3 of the heat storage container 1a can be sufficiently utilized in the facility 85 by repeating the heat dissipation process. On the other hand, if it is determined that the heat dissipation has been completed, the heat dissipation process ends.

(effect)
Next, the effect which the heat storage apparatus 1 which concerns on this invention has is demonstrated. First, as described above, since the contribution to the heat storage by the oil 2 is smaller than the contribution to the heat storage by the erythritol 3, it is better that the volume of the oil 2 is small. Further, when the height of the oil 2 is low, it is difficult to separate the erythritol 3 and the oil 2, so the height of the oil 2 is preferably as high as possible.

  And in the heat storage apparatus 1 which concerns on this embodiment as mentioned above, as the shape of the heat storage container 1a is shown to FIG. 3 (a), (b), the (at least 1) vertical direction of the heat storage container 1a In the cross section (see FIG. 3B), the horizontal width of the inner surface 1i of the heat storage container 1a is smaller on the upper side than on the bottom side, and further, the horizontal width is from the bottom side to the upper side. It has a portion P1 that gradually decreases. Therefore, in the heat storage container 1a, when the volume of the oil 2 is reduced, the height of the oil 2 is increased as compared with the case where the heat storage container has a rectangular parallelepiped shape (when the vertical cross section inside the heat storage container is a square shape). Can be high. Therefore, erythritol (heat storage body) 3 and oil (heat exchange medium) 2 can be efficiently separated while reducing the volume of oil 2.

  The separation of erythritol (heat storage body) 3 and oil (heat exchange medium) 2 in the heat storage device 1 will be described more specifically. For example, considering that only oil 2 is circulated between the heat storage container 1a and the heat exchangers 5a and 5b during heat storage and heat dissipation, only the oil 2 is taken into the discharge hole 6h (erythritol 3). It is necessary to arrange the discharge pipe 6 so that it is not taken in. Here, when the height of the oil is low (the oil layer is thin), it is difficult to arrange so that only the oil is discharged into the discharge pipe and erythritol does not enter the discharge pipe. If the oil is high (the oil layer is thick), it is easy to dispose only the oil 2 into the discharge pipe 6 and prevent the erythritol 3 from entering the discharge pipe 6. Therefore, by increasing the height of the oil 2 (thickening the oil layer), it becomes easy to arrange the discharge hole 6h at a position where only the oil 2 can be circulated, and erythritol 3 can be used during heat storage and heat dissipation. And oil 2 can be efficiently separated, and only circulating oil 2 can be efficiently recovered. Moreover, not only at the time of heat storage and at the time of heat dissipation, but also when it is necessary to recover only the oil 2 inside the heat storage container 1a for replacement or the like, the height of the oil 2 is high, so that only the oil 2b is efficiently Can be recovered.

  And by the structure of the thermal storage apparatus 1, the erythritol 3 and the oil 2 can be isolate | separated efficiently, reducing the volume of the erythritol 3, As a result, when the thermal storage container is a rectangular parallelepiped shape (the vertical direction cross section of the container inner surface is The ratio of erythritol 3 in the container is improved and the heat storage density of the heat storage device 1 is improved, and the erythritol 3 is less likely to be mixed into the circulating oil 2 or the recovered oil 2. Become. Moreover, since the weight of oil 2 minutes with small contribution to heat storage can be reduced, even if the oil 2 is transported together with the heat storage container 1a, the heat transport efficiency is improved.

  Further, in the heat storage container 1a, the horizontal width of the inner surface 1i of the heat storage container 1a is smaller on the upper side than on the bottom side in the vertical cross section in the direction perpendicular to the longitudinal direction of the heat storage container 1a. By doing in this way, the horizontal direction width | variety of an upper side inner surface becomes smaller over the longitudinal direction length of the thermal storage container 1a, and erythritol 3 and the oil 2 can be isolate | separated more efficiently.

  Moreover, since the inner surface 1i of the heat storage container 1a is formed so as to have a trapezoidal shape in the vertical cross section, the erythritol 3 and the oil 2 are efficiently reduced by reducing the volume of the oil 2 with a simple shape. Can be separated.

  Moreover, it becomes difficult for the thermal storage container 1a to fall by making the vertical direction cross section of the inner surface 1i of the thermal storage container 1a into a trapezoidal shape.

(Modification)
Next, first to fourth modified examples of the heat storage container 1 according to the above embodiment will be described with a focus on portions different from the above embodiment with reference to FIGS. 4 to 7.

(First modification)
FIG. 4 is a schematic cross-sectional view of the heat storage device 101 according to the first modification. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The heat storage container 101a of the heat storage device 101 according to the first modified example has a rectangular lower surface whose inner surface 101i is perpendicular to the longitudinal direction of the heat storage container 101a (see FIG. 4B). It has a hexagonal shape having a side quadrangular portion 101s and a trapezoidal upper trapezoidal portion 101d. The interface between erythritol 3 and oil 2 is set so as to be positioned below the trapezoidal portion 101d (trapezoidal portion) (above the boundary between the trapezoidal portion 101d and the rectangular portion 101s). ing. By doing in this way, about the oil 2, the volume of the oil 2 can be reduced and the height of the oil 2 can be made high. On the other hand, for erythritol 3, the volume of erythritol 3 can be increased and the height of erythritol 3 can be minimized. Similarly, the heat storage container 101a has a portion in which the horizontal width gradually decreases from the bottom side to the top side (see the P2 portion in FIG. 4B).

  By configuring the heat storage device 1 according to this modification as described above, the same effects as those of the above-described embodiment can be obtained, and erythritol 3 and oil 2 can be efficiently separated, and heat storage It is possible to prevent the height of the entire container 101a from becoming unnecessarily high. In addition, when the interface between erythritol 3 and oil 2 is below trapezoidal portion 101d, at least a part of oil 2 is in quadrangular portion 101s. The height of 2 cannot be increased. Therefore, as in this modification, the volume of the oil 2 can be reduced and the height of the oil 2 can be increased by making the interface be higher than the rectangular portion 101s. Moreover, since the flow of the oil 2 is not obstructed by the configuration of this modification, the heat storage efficiency is improved.

(Second modification)
FIG. 5 is a schematic cross-sectional view of a heat storage device 201 according to the second modification. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The heat storage container 201a according to the second modification has a portion in which the horizontal width of the container inner surface 201i gradually decreases in the vertical cross section (see FIG. 5B) in the direction perpendicular to the longitudinal direction of the heat storage container 201a (see FIG. 5B). It is formed so as to have a curved portion (see P3 portion in the figure). For this reason, the configuration of the present modification can provide the same effect as that of the above-described embodiment, and further, by having the curved portion, the flow of the oil 2 is not inhibited and the heat storage efficiency is improved.

(Third Modification)
FIG. 6 is a schematic cross-sectional view of a heat storage device 301 according to a third modification. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The heat storage container 301a according to the second modification is configured such that the inner surface 301i thereof has a triangular shape in a vertical cross section (see FIG. 6B) in a direction perpendicular to the longitudinal direction of the heat storage container 301a. Yes. And in the cross section of FIG.6 (b), the thermal storage container 301a is formed so that it may have a part (refer P4 part of a figure) where the horizontal direction width | variety of the inner surface 301i reduces gradually from the bottom part side to the upper part side. . The same effects as those of the above-described embodiment can be obtained by the configuration as in this modification.

(Fourth modification)
FIG. 7 is a schematic cross-sectional view of a heat storage device 401 according to a fourth modification. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In the heat storage container 401a according to the second modification, the inner surface 401i is curved in the vertical section (see FIG. 7B) in the direction perpendicular to the longitudinal direction of the heat storage container 401a, and the side portion is curved, and the upper and lower portions Is configured to be horizontal. And in the cross section of FIG.6 (7), the thermal storage container 301a is formed so that it may have a part (refer P5 part of a figure) where the horizontal direction width | variety of the inner surface 401i reduces gradually from a bottom part side to an upper part side. . The portion P5 is a curved portion. The same effects as those of the above-described embodiment can be obtained by the configuration as in this modification. Moreover, by having a curved part, the flow of the oil 2 is not inhibited and the heat storage efficiency is improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  For example, in the above-described embodiment and the modification thereof, the vertical section is shown symmetrically, but is not limited to such a form and may be asymmetrical.

  Further, by using erythritol having a high melting heat as a heat storage material, a heat transport system capable of storing heat at a high temperature (about 119 degrees) with a large amount of heat storage can be obtained. By connecting 1a to a refrigerator, for example, it can be used for air conditioning.

Schematic which shows the whole structure of the heat transport system containing the thermal storage apparatus which concerns on 1st Embodiment of this invention. The vertical section schematic diagram showing the heat storage side of the heat transportation system containing a heat storage device. The cross-sectional schematic of the heat storage apparatus of FIG. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section taken along the line A-A 'of (a). The cross-sectional schematic of the heat storage apparatus which concerns on a 1st modification. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section taken along the line B-B 'in (a). The cross-sectional schematic of the heat storage apparatus which concerns on a 2nd modification. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section taken along the line C-C 'in (a). Sectional schematic of the heat storage apparatus which concerns on a 3rd modification. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section taken along the line D-D 'in (a). Sectional schematic of the thermal storage apparatus which concerns on a 4th modification. (A) is a vertical cross section in the longitudinal direction, and (b) shows a cross section at the position of the E-E 'line in (a). Sectional schematic of the thermal storage apparatus which concerns on a 5th modification. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section taken along the line F-F 'in (a). Sectional schematic of the heat storage apparatus which concerns on a 6th modification. (A) is a vertical cross section in the longitudinal direction, and (b) is a cross section at the position of the G-G ′ line in (a).

Explanation of symbols

1, 101, 201, 301, 401, 501, 601 Heat storage device 1a, 101a, 201a, 301a, 401a, 501a, 601a Heat storage container 1i, 101i, 201i, 301i, 401i, 501i, 601i Heat exchange medium)
3 Erythritol (heat storage)
P1, P2, P3, P4, P5, P6 Parts where the horizontal width gradually decreases

Claims (5)

A heat storage body for storing heat by latent heat storage;
Heat exchange by contacting the heat storage body, a heat exchange medium having a specific gravity smaller than the heat storage body and separated from the heat storage body;
A heat storage container that houses the heat storage body and the heat exchange medium, and
In at least one vertical section of the heat storage container, the horizontal width of the inner surface of the heat storage container is smaller on the upper side than on the bottom side,
A heat storage device comprising a portion in which the horizontal width gradually decreases from the bottom side to the upper side.   The heat storage device according to claim 1, wherein the vertical cross section is a vertical cross section in a direction perpendicular to a longitudinal direction of the heat storage container.   The heat storage device according to claim 1 or 2, wherein the heat storage container has an inner surface formed in a trapezoidal shape in the vertical cross section. The heat storage container is formed so that the inner surface thereof has a hexagonal shape having a lower quadrangular portion and an upper trapezoidal portion in the vertical section,
The heat storage device according to claim 1 or 2, wherein an interface between the heat storage body and the heat exchange medium is set to be positioned below the trapezoidal portion.   The said heat storage container is formed so that it may have a curved part in the part where the said horizontal direction width | variety reduces gradually in the said vertical direction cross section, either of Claim 1 or 4 characterized by the above-mentioned. Thermal storage device.

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