JP2007333296A - Heat storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage system high in heat storage efficiency, sufficient as heat capacity per volume and obtaining stable heat storage effect. <P>SOLUTION: The heat storage system 1 comprises at least an underground water storage tank 21; a heat storage soil tank 11 formed underground and having soil 15 infiltrated with moisture through the underground water storage tank 21; a closed pipeline 12 which is a pipe filled with a heat medium flowing inside, comprising a main line 12a laid to sink a part of the pipe in the soil 15 of the heat storage soil tank 11, and an auxiliary line 12b which is a portion other than the main line 12a; a heat collecting apparatus 13 connected inserted in an intermediate part of the auxiliary line 12b of the closed pipeline 12 and allowing the heat medium to flow inside; and a heat medium circulating pump 14 circulating the heat medium in the closed pipeline 12 and the heat collecting apparatus 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat storage system, and more particularly, to a heat storage system using a heat storage soil tank using soil formed in the ground and infiltrated with water.

  As a technique using natural energy, a heat storage system for storing heat in the ground has been conventionally known. This is due to the fact that the temperature change in the ground differs between the ground near the ground surface and the ground far from the ground surface during seasons such as summer and winter, or between time zones such as day and night. In addition, a pipe is provided between the ground close to the ground surface and the ground remote from the ground surface, and a heat medium is circulated in the pipe to store heat in the ground (for example, Patent Documents 1 and 2). reference). This heat storage system is employed as a snow melting system, particularly in snowy areas.

For example, in a snow melting system in a snowy area, such a heat storage system stores heat in the ground close to the ground surface warmed at a high outside temperature in the summer, and stores it in the ground away from the ground surface. By dissipating the heat stored in the distant ground into the ground close to the ground surface, the snow on the ground surface is melted.
JP-A-3-233007 JP 7-279114 A

  However, although the above heat storage system has been evaluated as a snow melting system, it is difficult to say that it has been evaluated for other uses, and its diffusion has not progressed. This is considered to be because the heat storage efficiency is not good in the above heat storage system, although the construction cost is high.

  That is, even if the above heat storage system is constructed, there is an aquifer that circulates in the ground over time in the basement of Japan, and the heat stored in the ground by this aquifer It is said that the final heat storage efficiency is reduced to about 30%. In addition, the volume specific heat of the soil in the ground is generally smaller than concrete but larger than wood, and is not necessarily insufficient as a heat storage material. However, since the soil in the ground has a high porosity and may reach about 50%, the heat capacity per volume is not always sufficient, and this is also a practical obstacle.

  Therefore, the present invention has been made to solve such a problem, and has a high heat storage efficiency, can be downsized, and has a sufficient heat capacity per volume, so that a stable heat storage effect can be obtained. It is intended to provide a heat storage system.

  The present invention has been made by paying attention to the fact that the volume specific heat of water is 2 to 3 times the volume specific heat of soil, and the water whose volume specific heat is higher than that of soil is permeated into the soil voids. At the same time, it is intended to store heat using the soil infiltrated with water. The heat storage system of the present invention is configured to include at least water infiltration means, a heat storage soil tank, a closed pipe line, a heat collecting device, and a heat medium circulation pump.

  Among these, the water permeation means has a function of permeating water into the soil. The heat storage soil tank is a tank provided with soil that is formed in the ground and into which water is infiltrated by the water infiltration means. The closed pipe path is composed of a pipe filled with a heat medium flowing through the inside, and a main path formed by laying so that a part of the pipe is buried in the soil of the heat storage soil tank, It consists of a sub route that is a part other than the main route. The heat collecting device is a device that is inserted and connected in the middle of the sub-path of the closed pipe and that the heat medium flows inside. The heat medium circulation pump has a function of circulating the heat medium in the closed pipe line and the heat collecting device.

  In the above heat storage system, the heat medium absorbs heat when the heat medium flows through the inside of the heat collector, and the heat storage soil tank passes through the pipe when the heat medium that has absorbed the heat flows through the pipe constituting the main path. The heat is stored in the soil by radiating heat to the soil.

  According to the above heat storage system, soil that has been infiltrated with water is used as a substance to be stored, and as described above, the volume specific heat of water is 2 to 3 times the volume specific heat of the soil, Higher heat storage efficiency can be obtained than when the material to be stored is simply soil. Therefore, a stable heat storage effect can be obtained and the size can be reduced. Moreover, since it is rainwater etc. to infiltrate into the soil which is the substance to be stored, there is an advantage in terms of operation cost.

  Moreover, since the soil which infiltrated the water which has 2 to 3 times the volume specific heat of soil as a heat storage material is used, even if it is a small heat storage system, it can be used practically and is mentioned later. Depending on how the heat storage system is used, it is not impossible to use the stored heat at home.

  In said heat storage system, it is preferable to cover the bottom face and side face of the heat storage soil tank with a water shielding sheet. By doing in this way, it can prevent that the water contained in the soil of a thermal storage soil tank leaks outside the thermal storage soil tank. Further, it is possible to prevent water from the aquifer from entering the heat storage soil tank, and it is possible to prevent the stored heat from being dissipated by the aquifer. Therefore, the heat storage efficiency in the heat storage system can be increased by these.

  In the heat storage system described above, it is preferable to use an underground water storage tank that stores water such as rain water and the stored water permeates downward from the bottom as the water infiltration means. In this case, the underground water storage tank is formed in the ground, and the heat storage soil tank is formed below the underground water storage tank so as to overlap with the underground water storage tank.

  The above-mentioned underground water storage tank prevents flooding by storing the water overflowing from rainwater and sewers during the rainy season and typhoon, and also stores the stored water around the underground water storage tank. It is gradually discharged by permeating into the soil. In order to use this underground water tank as a water infiltration means, the heat storage soil tank of the heat storage system is placed under the underground water tank so that the upper surface of the heat storage soil tank is in contact with the bottom surface of the underground water tank. Overlapping and forming. Moreover, this underground water tank is formed so that the water stored in the underground water tank gradually permeates downward from the bottom of the underground water tank. Therefore, water can be stably infiltrated into the soil voids of the heat storage soil tank, and a stable heat storage effect can be obtained.

  According to the above heat storage system that uses this underground water tank as a water infiltration means, the underground water tank is constructed for the original purpose of the underground water tank, so the construction cost of the underground water tank is the construction of the heat storage system. It can be accounted for separately from costs. Therefore, a heat storage system can be rationally constructed by constructing a heat storage system as described above.

  Moreover, in said heat storage system, it is preferable to fix the anchor board which has water permeability while covering the upper surface of a thermal storage soil tank to the bottom face of an underground water storage tank. Since water is infiltrated into the soil of the heat storage soil tank, the surface of this soil is in a soft state because the heat storage soil tank is filled with water-containing soil. If an underground water storage tank is provided above, this underground water storage tank may sink into the soil of the thermal storage soil tank. This fear is particularly remarkable when the bottom surface of the underground water storage tank is narrower than the area of the top surface of the heat storage soil tank. In addition, there is no risk that the underground water storage tank will float due to buoyancy due to water infiltrating into the soil around the underground water storage tank due to flooding or the like.

  Therefore, by fixing an anchor board that covers the upper surface of the thermal storage soil tank and has water permeability on the bottom surface of the underground water storage tank, the underground water storage tank is stored in the thermal storage soil tank while ensuring penetration from the underground water storage tank to the thermal storage soil tank. The underground water tank can be prevented from sinking into the soil of the heat storage soil tank. In addition, it is possible to prevent water from infiltrating into the soil around the underground water storage tank due to flooding and the like, and the underground water storage tank from floating due to buoyancy.

  Moreover, in said heat storage system, you may make it mix a heat storage member in the soil of a thermal storage soil tank. Since this heat storage member has a larger volume specific heat than soil containing water, the heat storage efficiency can be further improved by doing in this way.

  In the above heat storage system, a columnar heat storage member may be provided in the soil of the heat storage soil tank. Since this columnar heat storage member also has a larger volume specific heat than water-containing soil, the heat storage efficiency can be further improved by doing so.

  Moreover, as above-mentioned, in the soil of a thermal storage soil tank, it lays | lays so that the pipe which comprises the main path | route may be buried. At the time of this laying, the pipe is generally laid in a meandering manner. For this reason, it is necessary to bend the pipe. Therefore, when laying, the pipe can be bent easily by utilizing a columnar heat storage member provided in the soil of the heat storage soil tank.

  In the above heat storage system, the heat collecting device is constituted by a pipe through which a heat medium flows, and the pipe is shallower than the position of the heat storage soil tank formed in the ground away from the ground surface. It is preferable to embed in the ground near a certain surface. The heat collector plays the role of collecting heat to store heat, but the sun's heat is poured onto the ground surface, so the underground near the surface is the place where it is most likely to be warmed by the sun's heat. is there. For this reason, heat can be collected efficiently by flowing a heat medium through a pipe buried in the ground near the ground surface.

  Further, in this heat storage system, as described above, the heat stored by the use form of the heat storage system as described later can be used, and the following use can be performed. That is, by using a pipe buried in the ground near the ground surface as a heat collecting device, the ground near the ground surface can be cooled in summer, and the heat island phenomenon can be suppressed.

  Moreover, specifically, a solar heat collecting panel or a heat pump can be used as the heat collecting device used in the heat storage system.

  In the above heat storage system, a plurality of heat collecting devices may be provided. In this case, the plurality of heat collecting devices are inserted and connected in the middle of the sub-path in parallel with each other. Thus, the heat storage efficiency of the heat storage system can be improved by using a plurality of heat collecting devices.

  The heat stored in the above heat storage system can be used as follows. That is, the above heat storage system includes a heat storage utilization device that is inserted and connected in the middle of the sub-path and through which the heat medium flows. Then, when the heat medium flows through the pipe constituting the main path, the heat medium absorbs heat from the stored stored water through the pipe, and when the heat medium that has absorbed the heat flows inside the heat storage utilization device, the heat medium Heat storage is used by radiating heat.

  By doing in this way, a heat storage system can be utilized also for the objectives other than the snow melting described below which is a well-known utilization method of a heat storage system.

  The above heat storage system can be used as a snow melting system in winter. In this case, the ground surface where the heat collecting device of the heat storage system is provided is a road surface on which snow is accumulated in winter. In this heat storage system, in the winter, when the heat medium flows through the pipes constituting the main path, the heat medium that absorbs heat from the stored water stored in the season other than the winter through the pipe collects the heat medium. When flowing inside the heat device, heat is dissipated into the ground through the pipes that constitute the heat collector, so that the heat collector performs the snow melting function.

  According to the above heat storage system, the soil into which water is infiltrated is used as the target substance to store heat, and the volume specific heat of water is 2 to 3 times the volume specific heat of the soil. Higher heat storage efficiency can be obtained than when using simple soil, and a stable heat storage effect can be obtained. Therefore, a heat storage system can be reduced in size compared with the case where only mere soil is used as the heat storage material. Moreover, since it is rainwater etc. to infiltrate into the soil which is a substance to be stored, there is an advantage in terms of operation cost.

  In addition to storing water such as rainwater, a thermal storage soil tank is formed below the underground water tank formed so that the stored water gradually bleeds downward. By this, water can be permeated into the voids in the soil of the heat storage soil tank. Therefore, water can be stably infiltrated into the soil voids of the heat storage soil tank, and a stable heat storage effect can be obtained.

  In addition, since the underground water tank is built for the original purpose of the underground water tank, the construction cost of the underground water tank can be accounted for separately from the construction cost of the heat storage system. Can be built.

  Further, by configuring the heat collecting device with pipes buried in the ground near the ground surface, the heat island phenomenon can be suppressed in the summer, and it can be used as a snow melting system in the winter.

  Moreover, the heat storage efficiency can be further increased by using a solar heat collecting panel or a heat pump together as a heat collecting device. Moreover, heat storage can be utilized by providing the heat storage utilization apparatus.

  Hereinafter, a heat storage system according to an embodiment of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a schematic diagram illustrating a configuration of a heat storage system 1 in the first embodiment. In FIG. 1, the heat storage system 1 in the first embodiment mainly includes an underground water storage tank 21, a heat storage soil tank 11, a closed pipe 12, a heat collecting device 13, and a heat medium circulation pump 14. Among these, the underground water storage tank 21 and the heat storage soil tank 11 are both formed in the ground, and the underground water storage tank 21 is placed on the heat storage soil tank 11. In addition, in FIG. 1, the underground water storage tank 21 and the thermal storage soil tank 11 are displayed in cross section. The heat storage system 1 is used as a snow melting system and is formed as follows.

  In a region where there is snow in the winter, first, the surface 18 is excavated with a length of 3 m, a width of 2.5 m, and a depth of 2.5 m to form a space in the underground 19. And the water-impervious sheet | seat 11a is laid in the side face whose height from a bottom face is 1 m from the bottom face and side face of this space. As the water shielding sheet 11a, a synthetic rubber sheet or a resin sheet having a thickness of about 0.1 to 0.2 is used.

Inside the space where the water-impervious sheet 11a is laid, a pipe is meandered and laid to form the main path 12a of the closed pipe path 12 composed of the main path 12a and the sub-path 12b. The pipe has an inner diameter of 10 to 20 mm, a length of about 10 m per 1 m ³ of the heat storage soil tank 11, and the pipe has a seamless thermal conductivity of about 1.0 W / mK. It is preferable to use a long pipe. As the material of the pipe, iron, stainless steel, synthetic resin or the like is used, but it is preferable to use metal-reinforced cross-linked polyethylene. The excavated soil is backfilled in the space where this pipe is laid, and a heat storage soil tank 11 having a length of 3 m, a width of 2.5 m, and a height of 1 m is formed.

  On the upper surface of the heat storage soil tank 11, an anchor board 24 having a length of 3 m, a width of 2.5 m, and a thickness of 5 cm that completely covers the upper surface of the heat storage soil tank 11 is disposed. The anchor board 24 is formed of a hard foamed resin, and as shown in FIG. 2, a hole 24a penetrating the front and back is provided.

  An underground water storage tank 21 is formed on the anchor board 24. That is, the heat storage soil tank 11 and the underground water storage tank 21 are formed so as to overlap each other via the anchor board 24. As the underground water storage tank 21, for example, a storage / penetration facility such as rainwater in “Rainwater storage / permeation facility” described in JP-A-2003-155762 is used. In the heat storage system 1 in the first embodiment, the underground water storage tank 21 has a length of 2 m, a width of 1.5 m, and a height of 1 m, and the bottom surface of the underground water storage tank 21 is smaller than the size of the upper surface of the heat storage soil tank 11. .

  This underground water tank 21 is configured by stacking filling members 22 as shown in FIG. That is, the filling member 22 includes a column portion 22a and a flat plate portion 22b as shown in FIG. 3, and a concave portion 22c into which the top portion of the column portion 22a is fitted is formed on the bottom surface of the flat plate portion 22b. . The filling member group is configured by arranging the filling members 22 in a planar shape, and stacking the filling members 22 by fitting the tops of the column portions 22a into the recesses 22c. And the underground water tank 21 is formed by covering the bottom and side surfaces of the filling member group with the water permeable sheet 21a. As the water permeable sheet 21a, a composite sheet of polyester and polypropylene is used. The filling member group covered with the water permeable sheet 21a is fixed to the anchor board 24 with a wire or the like. The upper part of the underground water storage tank 21 is covered with a covering member 23. Then, the excavated soil is backfilled around the underground water storage tank 21.

  The underground water storage tank 21 is connected to a road gutter or the like via a conduit pipe or a mud reservoir which is not shown in the figure. The underground water storage tank 21 has rainwater or the like via the conduit pipe or the mud reservoir. Flows in and is stored. The underground water tank 21 configured in this way prevents flooding and the like by storing the water overflowing from rainwater and sewers during the rainy season or the typhoon, and the stored water 25 is stored. The water is gradually discharged by infiltrating the soil around the underground water storage tank 21 through the water-permeable sheet 21a.

  The underground water storage tank 21 is formed so as to overlap with the heat storage soil tank 11 and the anchor board 24, and the anchor board 24 is provided with a hole 24a penetrating the front and back as shown in FIG. Yes. Therefore, the stored water 25 in the underground water storage tank 21 not only penetrates into the soil around the underground water storage tank 21 but also the soil 15 in the heat storage soil tank 11 from the bottom of the underground water storage tank 21 through the hole 24a of the anchor board 24. Therefore, the soil 15 of the heat storage soil tank 11 becomes soil in which water is infiltrated.

  Since the volume specific heat of water is 2 to 3 times the volume specific heat of soil, as a heat storage material, water infiltrated with water has a larger volume specific heat than mere soil that is not. Therefore, by using soil infiltrated with water as a substance to be stored, higher heat storage efficiency can be obtained than when using simple soil.

  In addition, the above-described heat storage soil tank 11 is formed under the above-described underground water storage tank 21, and the main path 12 a composed of pipes laid in the soil 15 of the heat storage soil tank 11 has a sub-path. 12b is connected. The sub-path 12b is composed of the same pipe as the main path 12a, and in the middle of the sub-path 12b, as shown in FIG. 1, the heat medium circulation pump 14 and the heat collector 13 are connected in series. .

  The closed pipe 12 is filled with a heat medium. As the heat medium, an antifreeze liquid used for cooling an automobile engine or the like, or a liquid having a large heat capacity is used. The heat medium circulation pump 14 connected in the middle of the sub-path 12 b is installed on the ground and is used to circulate the heat medium filled in the closed pipe line 12 into the closed pipe line 12. That is, the heat medium circulates between the heat collecting device 13 and the closed pipe 12 by the heat medium circulation pump 14.

  Further, the heat collecting device 13 connected in the middle of the closed pipe 12 is constituted by a heat collecting pipe 13a. The heat collecting pipe 13a is constituted by a pipe through which a heat medium flows, and this pipe is located near the surface 18 that is shallower than the position of the heat storage soil tank 11 formed in the ground away from the surface 18. It is buried in the underground 19 In addition, the surface 18 is a place where snow is melted on a road surface that accumulates snow in winter. This heat collecting pipe 13 a is also formed by a pipe similar to the pipe constituting the closed conduit 12. As this pipe, it is preferable to use a seamless long pipe made of a resin rod having a thermal conductivity of about 1.5 W / mK. The heat collector 13 heats the ground surface 18 with the heat of the sun in the summer or the like, so that the heat of the soil near the ground surface 18 is heated inside the heat collecting pipe 13a constituting the heat collector 13. It has a function of supplying the flowing heat medium. Therefore, the heat collecting pipe 13a is buried from the ground surface 18 to a depth of about 0.5 to 1.0 m.

  Next, the operation of the heat storage system 1 used as the snow melting system will be described. As described above, the surface 18 is warmed by the heat of the sun in the summer, so the soil near the surface 18 is also warmed. However, in the winter, the surface 18 is covered with snow, so the surface 18 is cooled. The soil near the surface 18 is also cooled. On the other hand, since the soil 15 is far away from the ground surface 18 with respect to the soil 15 of the heat storage soil tank 11 provided in the ground, the heat of the ground surface 18 heated by the heat of the sun in summer and the like. Is difficult to be directly heated, and conversely, in winter, it is difficult to be cooled directly by the snow on the surface 18. That is, when comparing the temperature of the soil 15 in the thermal storage soil tank 11 and the temperature of the soil near the ground surface 18, the temperature of the soil 15 in the thermal storage soil tank 11 is lower than the temperature of the soil near the ground surface 18 in summer. In winter, the temperature of the soil 15 in the heat storage soil tank 11 is higher than the temperature of the soil near the ground surface 18.

  Therefore, in the heat storage system 1 described above, when the heat medium flows through the heat collector 13 in summer or the like, the heat medium absorbs heat, and when the heat medium that has absorbed the heat flows through the pipes constituting the main path 12a. In addition, heat is stored in the soil 15 of the heat storage soil tank 11 by dissipating heat to the soil 15 of the heat storage soil tank 11 through the pipe. In the winter, when the heat medium flows through the pipes constituting the main path 12a, the heat medium that absorbs heat from the soil 15 of the heat storage soil tank 11 stored in the summer and absorbs the heat is collected. When flowing through the inside of the heat device 13, the soil near the ground surface 18 is warmed by radiating heat to the soil near the ground surface 18 through the pipes constituting the heat collecting device 13, so that the soil near the ground surface 18 is heated. Melting snow.

  According to said heat storage system 1, the soil which made water penetrate | infiltrate is used as a substance of the object to store heat, and as mentioned above, the volume specific heat of water is 2 to 3 times the volume specific heat of soil. Higher heat storage efficiency can be obtained than in the case where the substance to be stored is simply soil, and a stable heat storage effect can be obtained. Therefore, compared with the case where only soil is used as the heat storage material, the heat storage system can be downsized. Moreover, since it is rainwater etc. to infiltrate into the soil which is the substance to be stored, there is an advantage in terms of operation cost.

  Further, as described above, the heat storage system 1 can be used as a snow melting system, and since a pipe embedded in the underground 19 near the ground surface 18 is used as the heat collecting device 13, in the summer, the heat storage system 1 near the ground surface 18 is used. The underground 19 can be cooled and the heat island phenomenon can be suppressed.

  Moreover, in said heat storage system 1, since the bottom face and side surface of the thermal storage soil tank 11 are covered with the water shielding sheet 11a, the water contained in the soil 15 of the thermal storage soil tank 11 leaks outside the thermal storage soil tank 11. It can be prevented from coming out. Moreover, it can prevent that the water from an aquifer penetrate | invades into the thermal storage soil tank 11, and can prevent that the stored heat is dissipated by an aquifer. Therefore, the heat storage efficiency in the heat storage system can be increased by these.

  In the above heat storage system 1, the underground water tank 21 is constructed for the original purpose of the underground water tank 21. Therefore, the construction cost of the underground water tank 21 excludes the underground water tank 21 in the heat storage system 1. It can be recorded in a separate account from the construction cost of the part. Therefore, according to said heat storage system 1, a heat storage system can be rationally constructed.

  In the above heat storage system 1, the anchor board 24 is fixed to the bottom surface of the underground water storage tank 21, so that the stored water 25 penetrates the heat storage soil tank 11 from the underground water storage tank 21 and the underground water storage tank is secured. 21 can be fixed on the heat storage soil tank 11, and the underground water storage tank 21 can be prevented from sinking into the soil of the heat storage soil tank 11. In addition, it is possible to prevent water from infiltrating into the soil around the underground water storage tank 21 due to flooding or the like and causing the underground water storage tank to rise due to buoyancy.

  In the heat storage system 1 described above, the heat storage soil tank 11 is composed of only the soil 15 into which water has permeated, but further, the soil 15 of the heat storage soil tank 11 is a substance having a larger volume specific heat than water. You may make it mix the comprised heat storage auxiliary member. For example, the heat storage auxiliary member has a spherical shape with a diameter of about 10 to 50 mm.

  As a material of this heat storage auxiliary member, sodium inorganic acid salt type or paraffin type material is known, but at 15 to 5 ° C., phase change between solid and liquid, or attachment / detachment of hydrated water A so-called latent heat storage material that causes phase change due to the above and releases / absorbs heat at a constant temperature is preferable. Specifically, for example, n-butylammonium bromide or the like in which the fine particles in the slurry melt at 12 ° C. and precipitate again at 7 degrees is used. Further, if the temperature of the soil 15 in the heat storage soil tank 11 exceeds 20 ° C., sodium sulfate that undergoes a phase transition at 23-19 ° C. can be used. By using such a heat storage auxiliary member, the heat storage efficiency can be further improved.

  Moreover, in said heat storage system 1, you may make it provide a column-shaped heat storage member in the soil of a thermal storage soil tank. This columnar heat storage member is also made of the same material as the heat storage auxiliary member. Therefore, since this columnar heat storage member has a volumetric specific heat larger than that of the soil containing water, as in the case of the heat storage auxiliary member, the heat storage efficiency can be further improved.

  Moreover, as above-mentioned, in the soil of a thermal storage soil tank, it lays | lays so that the pipe which comprises the main path | route may be buried. At the time of this laying, the pipe is laid meandering as described above. For this reason, it is necessary to bend the pipe. Therefore, when laying, the pipe can be bent easily by utilizing a columnar heat storage member provided in the soil of the heat storage soil tank.

  Further, in the heat storage system 1 described above, another heat collecting device used in combination with the heat collecting device 13 may be used as a device for collecting heat in addition to the heat collecting device 13. This other heat collecting apparatus is inserted and connected in parallel with the heat collecting apparatus 13 in the middle of the sub-path 12 b of the closed pipe 12. As this another heat collecting apparatus, for example, a solar heat collecting panel or a heat pump can be used. By doing in this way, the amount of heat collection can be increased, and the heat storage efficiency of the whole system can be improved especially in cold districts. Moreover, as this another heat collecting device, it is not restricted to a solar heat collecting panel or a heat pump, and any device can be used as long as the heat medium in the heat storage system 1 can absorb heat.

  Moreover, in said heat storage system 1, as above-mentioned, the underground water tank 21 is piled up on the thermal storage soil tank 11, and the stored water 25 stored by the underground water tank 21 is made into the underground water tank 21. Is infiltrated into the soil 15 of the heat storage soil tank 11. As a method of infiltrating water into the soil 15 of the heat storage soil tank 11, a method not using the underground water storage tank 21 as well as a method using the underground water storage tank 21 as described above can be considered.

  For example, the heat storage soil tank 11 as described above is formed in the ground, and water is sprayed on the soil surface 15 of the heat storage soil tank 11 by spraying water on the surface of the ground surface where the heat storage soil tank 11 is formed. It is a method of infiltration. In this case, a flower bed or the like is provided on the ground surface, and the water sprayed on the flower bed penetrates into the soil 15 of the heat storage soil tank 11. This watering can be performed manually, but can also be performed automatically using a watering machine or the like.

<Embodiment 2>
FIG. 4 is a schematic diagram showing the configuration of the heat storage system 2 in the second embodiment. The heat storage system 1 in the first embodiment is used as a snow melting system, but the heat storage system 2 in the second embodiment is an example of one used for purposes other than snow melting. The heat storage system 2 in the second embodiment uses a solar heat collection panel 32 instead of the heat collection device 13 of the heat storage system 1 in the first embodiment.

  That is, in the heat storage system 2 in the second embodiment, in the heat storage system 1 in the first embodiment, a solar heat collecting panel 32 is inserted in the middle of the sub-path 12b of the closed pipe 12 instead of the heat collecting device 13. And a hot water supply heating device 31 is inserted and connected in parallel with the solar heat collecting panel 32 as a heat storage utilization device. In FIG. 4, as in FIG. 1, the underground water storage tank 21 and the thermal storage soil tank 11 are displayed in cross section.

  The solar heat collecting panel 32 has a structure in which a pipe through which a heat medium flows is meandered on a plane and collects heat when the heat medium flowing through the pipe is heated by solar heat. . As the solar heat collecting panel 32, generally, a solar heat collecting panel 32 having a heat collecting efficiency of an annual heat collecting amount of 7000 MJ / year or more and installed and used on a roof of a house or the like is used.

  A plurality of solar heat collecting panels 32 may be used. In this case, the plurality of solar heat collecting panels 32 are inserted and connected in the middle of the sub-path 12b in parallel with each other. The solar heat collecting panel 32 may be installed at any place other than the roof of a house, as long as the solar heat collecting panel 32 can be installed on the rooftop of a building or other places.

  The hot-water supply heating device 31 constitutes a part of a hot-water supply system used in general households and the like. The hot-water supply heating device 31 includes a hot-water supply heating pipe. Inside, the heat medium which flows through the inside of the closed pipe 12 of the heat storage system 3 flows. In this hot water supply heating device 31, when water used at home or the like is heated to make hot water, first, in the first stage, the water to be heated is heated by the heat of the heat medium flowing in the hot water supply heating pipe. After the warming, the warmed water is further heated in the second stage using a gas or the like, as in a normal water heater. Therefore, the amount of heating in the second stage can be reduced by the amount of water warmed in the first stage, so that energy saving can be achieved.

  According to the heat storage system 2 in the second embodiment, all the effects can be obtained except for the effects as the snow melting system among the effects of the heat storage system 1 in the first embodiment.

  In the heat storage system 2 according to the second embodiment, the solar heat collecting panel 32 is used for collecting heat. However, instead of this, a heat pump may be used. Alternatively, the solar heat collecting panel and the heat pump may be used. Both may be used. The heat pump is generally used in an air conditioner, a refrigerator, or the like, but when used in the heat storage system 2 in the above-described second embodiment, the heat medium of the heat storage system 2 is heated by the heat pump operating. Use it in such a way that it works properly. The apparatus used for collecting heat is not limited to a solar heat collecting panel or a heat pump, and any apparatus can be used as long as the heat medium in the heat storage system 2 can absorb heat.

  In the heat storage system 2 according to the second embodiment, the hot water supply heating device 31 is used as the heat storage utilization device, but an air conditioner can be used in the same manner as the hot water supply heating device 31. . The heat storage utilization device is not limited to a hot water supply heating device or an air conditioner, and any device that can be heated by a heat medium in the heat storage system 2 can be used.

  In addition, in the heat storage system 2 in the second embodiment, the soil 15 of the heat storage soil tank 11 is made of a material having a larger volume specific heat than water in the same manner as the heat storage system 1 in the first embodiment. A heat storage auxiliary member may be mixed. By doing in this way, the heat storage efficiency can further be improved like the heat storage system 1.

  Similarly, a columnar heat storage member may be provided in the soil of the heat storage soil tank 11. By doing in this way, the construction of the pipe in the heat storage soil tank 11 can be facilitated and the heat storage efficiency can be further improved, as described in the heat storage system 1 in the first embodiment.

  In the heat storage system 2 in the second embodiment, in order to improve the heat collection efficiency, in the heat storage system 1 in the first embodiment described above, in parallel with the solar heat collection panel 32 in the middle of the sub-path 12b of the closed pipe 12. The used heat collecting device 13 may be inserted and connected. As described above, the heat collecting apparatus 13 is constituted by a pipe through which a heat medium flows, and the pipe is shallower than the position of the heat storage soil tank 11 formed in the ground away from the ground surface 18. It is buried in the underground 19 near the surface. FIG. 5 is a schematic diagram showing the configuration of such a heat storage system. In FIG. 5, as in FIG. 4, the underground water storage tank 21 and the thermal storage soil tank 11 are displayed in cross section. Even in this system, soil infiltrated with water is used as a target substance to store heat, and higher heat storage efficiency can be obtained than when the target substance to store heat is simply soil, and a stable heat storage effect can be obtained. I can do it. Therefore, compared to the case where only the soil is used as the heat storage material, this system can reduce the size of the heat storage system, and is not impossible to use at home.

It is the schematic which showed the structure of the thermal storage system in Embodiment 1. FIG. It is a perspective view of the anchor board used for the thermal storage system in Embodiment 1. FIG. 2 is a perspective view of a filling member used in the heat storage system in Embodiment 1. FIG. It is the schematic which showed the structure of the thermal storage system in Embodiment 2. FIG. It is the schematic which showed the other structure of the thermal storage system in Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal storage system 2 Thermal storage system 11 Thermal storage soil tank 11a Water shielding sheet 12 Closed pipe 12a Main path 12b Sub path 13 Heat collector 13a Heat collection pipe 14 Heat medium circulation pump 15 Soil 18 Ground surface 19 Underground 21 Underground water tank 21a Permeable sheet DESCRIPTION OF SYMBOLS 22 Filling member 22a Pillar part 22b Flat plate part 22c Recessed part 23 Cover member 24 Anchor board 24a Hole 25 Reserved water 31 Heating apparatus for hot water supply 32 Solar heat collecting panel

Claims (11)

Water infiltration means for infiltrating water into the soil;
A heat storage soil tank comprising soil that is formed in the ground and into which water is infiltrated by the water infiltration means;
A main path formed by a pipe filled with a heat medium flowing through the inside, and a part of the pipe laid so as to be buried in the soil of the heat storage soil tank, and the main path A closed channel composed of a sub route that is a part other than
A heat collecting device that is inserted and connected in the middle of the sub-path of the closed pipe and the heat medium flows through the inside;
A heat medium circulation pump that circulates the heat medium in the closed pipe line and the heat collecting device, and
The heat medium absorbs heat when the heat medium flows inside the heat collecting device, and the heat storage soil tank passes through the pipe when the heat medium that has absorbed heat flows through the pipe constituting the main path. A heat storage system characterized in that heat is stored in the soil by radiating heat to the soil.   The heat storage system of Claim 1 which covered the bottom face and side surface of the said thermal storage soil tank with the water-impervious sheet. The water infiltration means is an underground water storage tank that stores water such as rainwater, and the stored water penetrates downward from the bottom and is formed in the ground.
The heat storage system according to claim 1 or 2, wherein the heat storage soil tank is formed to overlap the underground water storage tank below the underground water storage tank.   The heat storage system according to claim 3, wherein an anchor board that covers the upper surface of the heat storage soil tank and has water permeability is fixed to the bottom surface of the underground water storage tank.   The thermal storage system of any one of Claims 1-4 which mixed the thermal storage member in the soil of the said thermal storage soil tank.   The heat storage system according to any one of claims 1 to 5, wherein a columnar heat storage member is provided in the soil of the heat storage soil tank.   The heat collecting device is composed of a pipe through which the heat medium flows, and the pipe is located near the ground surface, which is shallower than the position of the heat storage soil tank formed in the ground away from the ground surface. The heat storage system according to any one of claims 1 to 6, which is buried in the ground.   The heat storage system according to any one of claims 1 to 6, wherein a solar heat collection panel, a heat pump, or both are used as the heat collection device.   The heat storage system according to any one of claims 1 to 8, further comprising a plurality of the heat collectors, wherein the heat collectors are inserted and connected in the middle of the sub-path in parallel with each other. A heat storage utilization device that is inserted and connected in the middle of the sub-path and the heat medium flows inside;
When the heat medium flows through the pipe constituting the main path, it absorbs heat from the heat-stored soil through the pipe, and when the heat medium that has absorbed heat flows through the heat storage utilization device, The heat storage system according to any one of claims 1 to 9, wherein the heat storage is performed by radiating heat from the heat medium.   The ground surface is a road surface that accumulates snow in the winter, and in the winter, when the heat medium flows through the pipe constituting the main path, the soil is stored in the season other than the winter through the pipe. When the heat medium that has absorbed heat and flows through the heat collecting device flows into the ground through the pipes constituting the heat collecting device, the heat collecting device performs a snow melting function. The heat storage system according to claim 7.

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