JP2007333295A - Heat storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage system high in heat storage efficiency, miniaturizable and obtaining stable heat storage effect with little dispersion caused by regional difference. <P>SOLUTION: The heat storage system 1 comprises at least an underground storage tank 11 formed underground and constituted in a space where water such as rainwater is stored as stored water 15; 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 stored water 15 of the underground storage tank 11, and an auxiliary line 12b which is a portion other than the main line; 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 for 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 an underground storage tank that is formed in the ground and stores water such as rainwater.

  BACKGROUND ART Conventionally, a heat storage system that stores heat in the ground is known as a technology that uses natural energy. 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.

Such a heat storage system, for example, in a snow melting system in a snowy area, stores heat in the ground near 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, since the soil in the ground has different compositions depending on the region and the heat capacity of the soil varies, there are variations due to regional differences, which is a practical obstacle.

  Accordingly, the present invention has been made to solve such a problem, and provides a heat storage system that has a high heat storage efficiency, can be downsized, has little variation due to regional differences, and provides a stable heat storage effect. It is something to try.

  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. Water such as rainwater is stored in the ground, and the stored rainwater is It is intended to store heat. The heat storage system of the present invention is configured to include at least an underground storage tank, a closed pipe line, a heat collecting device, and a heat medium circulation pump.

  Among these, the underground storage tank is a space that is formed in the ground and stores water such as rainwater as stored water. The closed pipe path is constituted by a pipe filled with a heat medium flowing through the inside, and a main path formed by laying a part of the pipe so as to be buried in the stored water of the underground storage tank And a sub route which is a portion 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 inside the heat collecting apparatus, and when the heat medium that has absorbed the heat flows through the pipe constituting the main path, The heat is stored in the stored water by dissipating heat.

  According to the above heat storage system, water is used as a heat storage material that is 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. The heat storage efficiency is several times higher than when the target substance is soil. Therefore, compared with the case where only soil is used as the heat storage material, the heat storage system can be downsized. In addition, since rainwater is used as the water that is the target material for heat storage, there is a merit in terms of operation cost, and since there are few regional differences such as variations in soil composition, a stable heat storage effect can be obtained.

  Moreover, since water having a volume specific heat of 2 to 3 times that of soil is used as the heat storage material, even a small heat storage system can be used practically, depending on the use form of the heat storage system as described later. It is not impossible to use the stored heat at home.

  In said heat storage system, you may make it mix a heat storage auxiliary member in the stored water of an underground storage tank. As this heat storage auxiliary member, it is preferable to use a substance having a volume specific heat larger than that of water. By doing in this way, heat storage efficiency can further be improved.

  Further, in the above heat storage system, it is preferable that the heat collecting device is constituted by a pipe which is embedded in the ground near the ground surface and through which the heat medium flows. 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, in said heat storage system, you may make it use the sub heat collecting apparatus inserted and connected in parallel with the heat collecting apparatus in the middle of the sub path | route, and being used together with a heat collecting apparatus. As this sub heat collecting device, a solar heat collecting panel, a heat pump, or the like can be used. By doing in this way, heat collection can be increased, and especially in cold regions, the heat storage efficiency of the entire system can be increased.

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

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

  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 through the inside of the heat apparatus, the heat collection apparatus performs a snow melting function by radiating heat to the ground through the pipes constituting the heat collection apparatus.

  Moreover, although said heat storage system is a system for storing heat, it can be used also for purposes other than heat storage. That is, the above heat storage system is provided with an underground water storage tank for storing water such as rainwater formed in the ground, and the underground water storage tank and the underground storage tank are connected to each other. It connects by the transfer means which can be transferred to a tank, and said heat storage system is constructed | assembled.

  The above-mentioned underground water storage tank prevents flooding by storing the water overflowing from rainwater and sewers during the rainy season or typhoon, and also discharges the stored water during the dry season Doing so will address water shortages. Therefore, by installing the heat storage system in combination with this underground water storage tank, when the water stored in the underground water storage tank is insufficient, the stored water in the underground storage tank of the heat storage system in addition to the underground water storage tank is It can be transferred to the underground water tank by the transfer means, and the discharge can be supplemented.

  According to the heat storage system of the present invention, water is used as the material to be stored, and the volume specific heat of water is 2 to 3 times the volume specific heat of the soil, so that the material to be stored is soil. Compared to the case, the heat storage efficiency is several times higher. Therefore, compared with the case where only soil is used as the heat storage material, the heat storage system can be downsized. In addition, since rainwater is used as the water that is the target substance for heat storage, there are merits in operational costs and there are few regional differences such as variations in soil composition, so a stable heat storage effect can be obtained. I can do it.

  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 secondary heat collecting device such as a solar heat collecting panel or a heat pump as the heat collecting device. Moreover, heat storage can be utilized by providing the heat storage utilization apparatus.

  Further, the underground storage tank of the heat storage system of the present invention is provided side by side with an underground storage tank for storing water such as rainwater formed in the ground, and the underground storage tank and the underground storage tank are connected to the underground storage tank. By connecting the stored water to the underground storage tank with a transfer means that can be transferred, if the stored water in the underground storage tank to be discharged is insufficient, the stored water in the underground storage tank can be transferred to the underground storage tank to supplement the discharge. it can.

  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 storage tank 11, a closed pipe 12, a heat collection device 13, and a heat medium circulation pump 14. In addition, in FIG. 1, the cross section of the underground storage tank 11 is displayed. The heat storage system 1 is used as a snow melting system and is formed as follows.

  In areas with snow in winter, first, excavate the surface 18 to form a space in the ground 19 and spread and solidify the ground stones etc. on the bottom of this space to form the foundation 11a with concrete, Side walls 11b are formed of concrete on the sides of the space. And the waterproof sheet 11c is laid on the surface of the base part 11a and the side wall 11b, and the underground storage tank 11 is formed. As the waterproof sheet 11c, a synthetic rubber sheet or a resin sheet having a thickness of about 0.1 to 0.2 is used. The size of the underground storage tank 11 is about the size of a cube having a side of 500 mm even if it is the smallest.

Inside the space of the underground storage tank 11, pipes are meandered and laid to form a main path 12a in a closed pipe path 12 composed of a main path 12a and a sub-path 12b. The pipe has a thickness of 10 to 20 mm and a length of about 10 m per 1 m ³ of the underground storage tank 11. In addition, it is desirable to use a seamless long pipe made of a resin rod having a thermal conductivity of about 1.0 W / mK. This pipe is fixed in the space of the underground storage tank 11 with a support material (not shown).

  The upper surface of the underground storage tank 11 on which the pipe is laid is covered with a concrete storage tank lid 11d, and the underground storage tank 11 is backfilled with soil during excavation so that the underground storage tank 11 is in the ground 19. Buried. In addition, the space of the underground storage tank 11 is coupled to a side ditch of a road through a water conduit and a mud reservoir which are not shown in the figure. Rainwater or the like flows through the mud reservoir and is stored as stored water. That is, the pipes constituting the main path 12 a of the closed conduit 12 are laid so as to be buried in the stored water in the underground storage tank 11.

  The sub route 12b is connected to the main route 12a constituted by pipes laid in the space of the storage tank 11. This sub-path 12b is also composed of the same pipe as the main path 12a, and in the middle of this sub-path 12b, as shown in FIG. 1, a heat medium circulation pump 14 and a heat collecting device 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 buried in the underground 19 near the surface 18 where snow is melted on the road surface where snow is accumulated 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 desirable 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, with respect to the stored water 15 stored in the space inside the underground storage tank 11 provided in the ground, since the stored water 15 is considerably separated from the ground surface 18, Since the heat of the ground surface 18 heated by heat is difficult to be transmitted, it is difficult to be directly warmed. Conversely, in winter, it is difficult to be directly cooled by the snow on the ground surface 18. That is, when the temperature of the stored water 15 is compared with the temperature of the soil near the ground surface 18, the temperature of the stored water 15 is lower than the temperature of the soil near the ground surface 18 in summer and the like. Is higher than the temperature of the soil near the 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 stored water 15 by dissipating heat to the stored water 15 through the pipe. In the winter, when the heat medium flows through the pipes constituting the main path 12 a, the heat medium that absorbs heat from the stored water 15 stored in the summer and absorbs the heat from the heat collecting device 13. When flowing inside, the underground 19 is warmed by radiating heat to the underground 19 through the pipes constituting the heat collecting device 13, and the snow on the road surface that is the ground surface 18 is melted.

  According to the heat storage system 1 described above, water is used as a target substance to store heat, and as described above, the volume specific heat of water is 2 to 3 times the volume specific heat of the soil. Compared to the case where the material is soil, the heat storage efficiency is several times higher. Therefore, compared with the case where only soil is used as the heat storage material, the heat storage system can be downsized. In addition, since rainwater is used as the water that is the target material for heat storage, there is a merit in terms of operation cost, and since there are few regional differences such as variations in soil composition, a stable heat storage effect can be obtained.

  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.

  In the above heat storage system 1, the underground storage tank 11 is made of concrete, but the structure of the underground storage tank 11 is described in “Storage and / or seepage facility for rainwater” described in JP-A-2003-155762. It may be made to have a structure like a storage facility for rainwater or the like. That is, it is configured by a structure in which resin-made filling members are stacked and the bottom and side surfaces of the stacked filling member group are covered with a waterproof sheet. In this case, the main path 12a of the closed pipe path 12 is laid in the vertical direction or the horizontal direction between the filling members.

  In the above heat storage system 1, only the stored water 15 is stored in the internal space of the underground storage tank 11, but the volume specific heat is higher than the water in the stored water 15 of the underground storage tank 11. You may make it mix the heat storage auxiliary member comprised with the substance with big. For example, the heat storage auxiliary member has a spherical shape with a diameter of about 10 to 50 mm. Moreover, as a material of this heat storage auxiliary member, sodium inorganic acid salt type or paraffin type material is known, but at 5 to 10 ° C., the phase change between solid and liquid, or hydration water A so-called latent heat storage material that causes a phase change due to the attachment / detachment of and releases / absorbs heat at a constant temperature is preferable. By using such a heat storage auxiliary member, the heat storage efficiency can be further improved.

  Further, in the heat storage system 1, as a device for collecting heat in addition to the heat collecting device 13, a sub heat collecting device used in combination with the heat collecting device 13 may be used. This sub heat collecting device is inserted and connected in parallel with the heat collecting device 13 in the middle of the sub route 12 b of the closed pipe 12. As this sub heat collecting apparatus, for example, a solar heat collecting panel, a heat pump or the like 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. Further, the secondary heat collecting device is not limited 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.

<Embodiment 2>
FIG. 2 is a schematic diagram showing the configuration of the heat storage system 2 in the second embodiment. The heat storage system 2 according to the second embodiment is the same as the heat storage system 1 according to the first embodiment, in which the underground storage tank 11 is provided together with the underground water storage tank 21 and the stored water 15 of the underground storage tank 21 is transferred to the underground water storage tank 21. For this purpose, a stored water transfer pipe 22 and a stored water transfer pump 23 are provided. In addition, in FIG. 2, the underground storage tank 11 and the underground water storage tank 21 are displayed in cross section. This heat storage system 2 is used as a snow melting system, similar to the heat storage system 1 in the first embodiment.

  The underground water storage tank 21 in the heat storage system 2 of Embodiment 2 is formed as follows similarly to the underground storage tank 11. That is, excavating the surface 18 to form a space in the underground 19, laying and solidifying the crushed stone on the bottom surface of this space, forming the foundation portion 21 a with concrete, and side walls with concrete on the side of the space 21b is formed. And the waterproof sheet 21c is laid on the surface of the base part 21a and the side wall 21b, and the underground water tank 21 is formed. As the waterproof sheet 21c, a synthetic rubber sheet or a resin sheet having a thickness of about 0.1 to 0.2 is used.

  Further, the upper surface of the underground water storage tank 21 is covered with a concrete storage tank lid 21d, and the underground water storage tank 21 is backfilled with soil during excavation so that the underground storage tank 21 is embedded in the underground 19. . The space of the underground water storage tank 21 is coupled to a side ditch of the road through a water conduit and a mud reservoir which are not shown in the figure. Rainwater etc. flows through the mud pool and is stored.

  In addition, a stored water transfer pipe 22 is provided between the underground storage tank 11 and the underground water storage tank 21, and a stored water transfer pump 23 is inserted and coupled in the middle of the stored water transfer pipe 22.

  The above underground water storage tank 21 prevents flooding by storing water overflowing from rainwater and sewers during the rainy season or typhoon, and also discharges the stored water during drought. Use to deal with water shortages. Therefore, when the water stored in the underground water storage tank 21 is insufficient, the stored water transfer pipe 23 moves the stored water in the underground storage tank 11 of the heat storage system provided with the underground water storage tank 21 by moving the stored water transfer pump 23. By discharging to the underground water storage tank 21 by 22, discharge can be supplemented.

  In the heat storage system 2 described above, the underground water storage tank 21 is made of concrete as described above, but the structure of the underground water storage tank 21 is described in “Reservation of rainwater and the like” described in JP-A-2003-155762 described above. And / or a “penetration facility”. In addition, the stored water transfer pump 23 and the stored water transfer pipe 22 are used to transfer the stored water in the underground storage tank 11 of the heat storage system provided together with the underground storage tank 21 to the underground storage tank 21. Transfer of stored water by connecting the vicinity of the bottom of the underground water storage tank 21 and the vicinity of the bottom of the underground storage tank 11 horizontally with a pipe with a valve, and opening and closing the valve of this pipe by manual or electric remote operation. May be controlled.

<Embodiment 3>
FIG. 3 is a schematic diagram showing the configuration of the heat storage system 3 in the third embodiment. The heat storage system 1 in the first embodiment is used as a snow melting system, but the heat storage system 3 in the third embodiment is an example used for purposes other than snow melting. That is, the heat storage system 3 according to the third embodiment is connected to the heat storage system 1 according to the first embodiment by inserting the hot water supply heating device 31 as a heat storage utilization device in parallel with the heat collecting device 13 in the middle of the sub-path 12b. It is a thing. Further, in order to improve the heat collection efficiency, a solar heat collection panel 32 is inserted and connected as a sub heat collection device in parallel with the heat collection device 13 in the middle of the sub route 12b of the closed pipe 12. In addition, in FIG. 3, the cross section of the underground storage tank 11 is displayed.

  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.

  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 3 in the third 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 addition, since the size can be reduced, it is not impossible to use the stored heat at home.

  In the heat storage system 3 according to the third embodiment, the solar heat collecting panel 32 is used as the auxiliary heat collecting device. However, instead of this, a heat pump may be used, or the solar heat collecting panel. Both of the heat pump and the heat pump 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 3 in the third embodiment, the heat medium of the heat storage system 3 is heated by the heat pump operating. Use it in such a way that it works properly. Further, the sub heat collecting device is not limited 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 3 can absorb heat.

  Further, in the heat storage system 3 according to the third 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 of use 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 3 can be used.

  Further, in the heat storage system 3 in the above-described third embodiment, the stored water 15 in the underground storage tank 11 is made of a substance having a larger volume specific heat than water in the same manner as the heat storage system 1 in the first embodiment described above. The 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.

  Further, in the heat storage system 3 in the above-described third embodiment, the underground storage tank 11 of the heat storage system 3 is provided side by side with the underground water storage tank as in the heat storage system 2 in the above-described second embodiment. You may make it provide the stored water transfer pipe and the stored water transfer pump for transferring the 11 stored water 15 to an underground water tank. Alternatively, a horizontal pipe with a valve that connects the vicinity of the bottom of the underground water storage tank and the vicinity of the bottom of the underground storage tank 11 may be provided. By doing in this way, the effect | action and effect similar to having demonstrated in Embodiment 2 can be acquired.

It is the schematic which showed the structure of the thermal 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 structure of the thermal storage system in Embodiment 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal storage system 2 Thermal storage system 3 Thermal storage system 11 Underground storage tank 11a Foundation part 11b Side wall 11c Waterproof sheet 11d Storage tank cover 12 Closed pipe 12a Main path 12b Sub path 13 Heat collector 13a Heat collection pipe 14 Heat medium circulation pump 15 Storage water DESCRIPTION OF SYMBOLS 18 Ground surface 19 Underground 21 Underground water tank 21a Base part 21b Side wall 21c Waterproof sheet 21d Water tank cover 22 Reservoir transfer pipe 23 Reservoir transfer pump 31 Hot water heater 32 Solar heat collecting panel

Claims (7)

An underground storage tank that is formed in the ground and is configured by a space in which water such as rainwater is stored as stored water;
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 stored water of the underground storage tank, and the main path A closed line consisting of a sub route that is a part other than the route;
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
When the heat medium flows through the heat collecting device, the heat medium absorbs heat, and when the heat medium that has absorbed the heat flows through the pipe constituting the main path, the stored water passes through the pipe. A heat storage system characterized in that heat is stored in the stored water by dissipating heat.   The heat storage system of Claim 1 which mixed the heat storage auxiliary member in the stored water of the said underground storage tank.   The heat storage system according to claim 1 or 2, wherein the heat collecting device is embedded in the ground near the ground surface and is configured by a pipe through which the heat medium flows.   A sub-heat collecting device such as a solar heat collecting panel or a heat pump, which is used in combination with the heat collecting device and is inserted and connected in parallel with the heat collecting device in the middle of the sub-path. Item 4. The heat storage system according to item 3. 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 stored stored water through the pipe, and the absorbed heat medium flows through the heat storage utilization device. The heat storage system according to any one of claims 1 to 4, wherein 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 stored water stored in a season other than the winter passes 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 that constitute the heat collecting device, the heat collecting device has a snow melting function. The heat storage system according to claim 3 or 4, wherein the heat storage system is fulfilled.   Along with an underground water tank that stores water such as rainwater formed in the ground, the underground water tank and the underground water storage tank can transfer the water stored in the underground water storage tank to the underground water storage tank. The heat storage system of any one of Claims 1-6 connected by the transfer means.

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