JP4820102B2 - Thermal storage system and building - Google Patents

Description

  The present invention relates to a heat storage system and a building. In particular, the present invention passes hot water that has received the exhaust heat of the cogeneration device through a heat storage pipe provided inside the heat storage body, stores the exhaust heat of the cogeneration device in the heat storage body, cools the hot water, The present invention relates to a heat storage system and a building for supplying the generated water to a cogeneration system.

As a cogeneration system, for example, there is a system that collects exhaust heat generated with the operation of a fuel cell, stores it in a hot water storage tank, and supplies hot water to a hot water supply, floor heating, or the like (see, for example, Patent Document 1). .
JP 2004-6217 A

  However, when the hot water storage tank is filled with hot water at the specified temperature and the hot water is not supplied to the outside of the hot water storage tank during the operation of the fuel cell, the cooling water of the fuel cell cannot be cooled. In such a case, since the fuel cell cannot be cooled, it is necessary to stop the operation of the fuel cell.

  It is not preferable to install a large hot water tank to reduce the frequency at which the fuel cell stops. Moreover, since the space for installing a large-sized hot water tank is required, there also existed the subject that a fuel cell became larger.

  In order to solve such a problem, the heat storage system according to the first embodiment of the present invention is provided with a cogeneration device that generates heat with power generation, and a heat generator that stores waste heat of the cogeneration device under the floor of the building. The heat storage body, the underground part that is further below the heat storage body and has a lower thermal conductivity than the heat storage body, and the hot water that is provided inside the heat storage body and that receives the waste heat of the cogeneration system The heat storage body absorbs the exhaust heat of the cogeneration device and cools the hot water, and the heat storage pipe for supplying the cooled hot water to the cogeneration device and the heat storage body and the underground section are provided. And a hot water supply pipe that absorbs the amount of heat stored in the water and heats the water flowing through the interior, and supplies the heated water to the hot water supply equipment. For this reason, the exhaust heat of a cogeneration apparatus can be utilized at low cost.

  The hot water supply pipe further raises the temperature of the water supplied to the hot water supply facility through the interior of the heat accumulator after the water supplied to the hot water supply facility is heated in advance through the underground portion. For this reason, hot water with high temperature can be supplied to hot water supply equipment, suppressing the amount of heat absorbed from the heat storage body.

  The heat storage pipe is further provided in the underground part, allowing hot water to pass through the inside of the heat storage body and then passing through the basement part to maintain the temperature of the heat storage body higher than the basement part and to absorb heat that is not absorbed by the heat storage body. Absorb in the basement. For this reason, even if it is a case where a cogeneration apparatus produces the quantity of heat exceeding the heat storage capacity of a heat storage body, it can store heat further to an underground part.

  Moreover, the heat storage system in the present embodiment further includes a plurality of foundations of the building surrounding the space under the floor where the heat storage body is provided, and also insulates between the heat storage body and the underground portion and the plurality of foundations. A side insulation covering the side surfaces of the plurality of foundations, an upper insulation covering the top of the heat storage body and extending to the vicinity of the side insulation, a basement, and a space under the floor In order to insulate between the outer ground and the outside, it was further provided with an external heat insulating material provided below the external ground below the floor and extending substantially horizontally. For this reason, the amount of heat stored in the heat storage body and the underground portion can be reduced to the outside.

  In the underground part, a heat insulating material having a lower thermal conductivity than the underground part is not provided further below the lowest heat storage pipe, and the amount of heat of the hot water is radiated downward from the heat storage pipe. For this reason, a cogeneration apparatus can be cooled appropriately and it can prevent that a cogeneration apparatus stops by lack of cooling.

  In addition, the heat storage system in this embodiment includes an underfloor condensation prevention pipe in which the amount of heat transferred per unit time per unit time to the underfloor is larger than that of the heat storage pipe, an underfloor thermometer for detecting the underfloor temperature, and an external underfloor When the temperature of the underfloor detected by an external thermometer that detects the temperature of the space and the underfloor thermometer is lower than the temperature of the external space under the floor detected by the external thermometer, the temperature of the underfloor is increased. In order to prevent dew condensation under the floor, a control unit for passing hot water through the underfloor condensation prevention pipe is further provided. For this reason, dew condensation under the floor can be prevented. Moreover, the deterioration of the building due to condensation under the floor can be prevented.

  The underfloor condensation prevention pipe is provided in the vicinity of the foundation of a building that is not insulated from the underfloor, and no heat insulating material is provided between the foundation and the underfloor condensation prevention pipe. For this reason, the underfloor can be efficiently dehumidified. In addition, construction for installing underfloor condensation prevention piping is easy.

  The cogeneration device is a fuel cell. Therefore, in addition to the reaction heat of the fuel cell, exhaust heat that is not used in the reformer in the fuel cell having the reformer can also be used for heat storage, so that the overall energy efficiency can be further increased.

  The building in another form of the present invention is a cogeneration device that generates exhaust heat together with power generation, a heat storage body provided below the floor to store the exhaust heat of the cogeneration device, and further below the heat storage body, It is installed in the underground part where the thermal conductivity is lower than that of the heat storage body, and inside the heat storage body, and the warm water that has received the exhaust heat of the cogeneration device is passed through to absorb the exhaust heat of the cogeneration device. Heat storage pipe that cools the hot water and supplies the cooled hot water to the cogeneration system, and is installed inside the heat storage body and the underground part, absorbs the amount of heat stored in the heat storage body and the underground part, and flows inside There was provided a hot water supply pipe for heating water and supplying the heated water to a hot water supply facility.

  The hot water supply pipe further raises the temperature of the water supplied to the hot water supply facility through the interior of the heat accumulator after the water supplied to the hot water supply facility is heated in advance through the underground portion. The heat storage pipe is further provided in the underground part, allowing hot water to pass through the inside of the heat storage body and then passing through the basement part to maintain the temperature of the heat storage body higher than the basement part and to absorb heat that is not absorbed by the heat storage body. Absorb in the basement.

  Moreover, the building in this form covers the side surfaces of a plurality of foundations in order to insulate between the plurality of foundations surrounding the space under the floor where the heat storage bodies are provided, the heat storage bodies and the underground portion, and the plurality of foundations. Side heat insulating material, upper heat insulating material covering the upper part of the heat storage body, extending to the vicinity of the side heat insulating material, touching a plurality of foundations, between the underground part and the ground outside the space under the floor In order to insulate, it was further provided with an external heat insulating material provided below the ground outside the floor and extending substantially horizontally.

  In the underground part, a heat insulating material having a lower thermal conductivity than the underground part is not provided further below the lowest heat storage pipe, and the amount of heat of the hot water is radiated downward from the heat storage pipe.

  In addition, the building in this embodiment has an underfloor condensation prevention pipe in which the amount of heat transfer per unit time per unit time to the underfloor is larger than that of the heat storage pipe, an underfloor thermometer that detects the underfloor temperature, and an external underfloor When the temperature of the underfloor detected by an external thermometer that detects the temperature of the space and the underfloor thermometer is lower than the temperature of the external space under the floor detected by the external thermometer, the temperature of the underfloor is increased. In order to prevent dew condensation under the floor, a control unit for passing hot water through the underfloor condensation prevention pipe is further provided.

  The underfloor condensation prevention pipe is provided in the vicinity of a foundation that is not thermally insulated from the underfloor, and no heat insulating material is provided between the foundation and the underfloor condensation prevention pipe.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, the exhaust heat of the cogeneration apparatus can be used at low cost.

  The present invention will be described below through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the development means of the invention.

  Drawing 1 is a figure showing an example of composition of building 42 provided with heat storage system 30 concerning an embodiment of the present invention. An object of the present embodiment is to provide a heat storage system that can use exhaust heat of a fuel cell at low cost.

  The heat storage system 30 accumulates heat and supplies the accumulated heat to the building 42. Here, the building 42 means a wide range including a station, in addition to a house, a building, a factory, and the like. The heat storage system 30 includes a fuel cell 40, a heat storage body 48, an underground portion 58, a heat storage pipe 44, a hot water supply pipe 46, an underfloor condensation prevention pipe 45, an upper heat insulating material 50, a side heat insulating material 52, An external heat insulating material 54, an underfloor thermometer 66, an external thermometer 68, a controller 80, a heating device 64, a hot water return valve 62, a hot water valve 60, a heat storage pump 70, a hot water supply pump 72, A hot water supply facility 56. The building 42 includes a floor 76, a foundation 74, and a vent 78.

  Under the floor 76 of the building 42, an underfloor surrounded by the foundation 74 and the floor 76 is formed. The foundation 74 is provided with a vent 78 that allows the outside air to communicate with the space under the floor. The heat storage body 48 is provided in the ground portion below the floor of the building 42, and there is an underground portion 58 below the heat storage body 48. Inside the heat storage body 48 and the underground portion 58, a heat storage pipe 44 through which hot water generated using the exhaust heat of the fuel cell 40 that supplies power to the building 42 is provided. The heat storage body 48 and the underground part 58 accumulate the amount of heat absorbed from the hot water flowing through the heat storage pipe 44. A hot water supply pipe 46 for supplying hot water to the hot water supply facility 56 is provided inside the heat storage body 48 and the underground portion 58. Hot water flowing through the hot water supply pipe 46 is heated by absorbing heat from the heat storage body 48 and the underground portion 58 and then supplied to the hot water supply pipe 46.

  As described above, the heat storage system 30 accumulates the exhaust heat of the fuel cell 40 in the underground portion 58 and the heat storage body 48 and supplies hot water heated by the accumulated heat amount to the hot water supply facility 56. That is, in the heat storage system 30, the hot water supplied to the hot water supply facility 56 is generated without installing the hot water storage tank for storing the hot water, so that the installation space for the hot water storage tank can be saved.

  The heat storage body 48 is made of a material having a higher thermal conductivity than the underground portion 58, such as concrete. Concrete has a larger amount of heat that can be accumulated per volume than the underground portion 58. Further, the heat storage body 48 may constitute a part of the building 42, such as moisture-proof concrete or soil concrete. Moreover, at least a part of the heat storage body 48 may be buried underground. The heat storage pipe 44 and the hot water supply pipe 46 are, for example, resin pipes made of a crosslinked polyethylene having excellent heat resistance and corrosion resistance. Thus, since the heat storage body 48, the heat storage piping 44, and the hot water supply piping 46 which are cheaper than the hot water storage tank are used, the exhaust heat of the fuel cell 40 can be used at low cost.

  The fuel cell 40 is, for example, a polymer electrolyte fuel cell (PEFC). The fuel cell 40 may be, for example, reforming city gas, propane gas or the like supplied to the building 42 to generate hydrogen gas as fuel, and hydrogen gas supplied from the outside as fuel. You may do. The fuel cell 40 recovers exhaust heat accompanying power generation and generates hot water. For example, the fuel cell 40 generates hot water by cooling the reaction heat accompanying the power generation of the fuel cell 40 or the heat generated by the exhaust heat not used by the reformer with water supplied to the fuel cell 40.

  The hot water generated by the fuel cell 40 flows through the heat storage pipe 44 connected to the fuel cell 40, and is guided by the heat storage pump 70 to the heat storage pipe 44 a inside the heat storage body 48. Then, after passing through the inside of the heat storage body 48, it is guided to the underground portion 58. The hot water flowing through the inside of the heat storage pipe 44 is cooled by absorbing the amount of heat while the heat storage body 48 and the underground portion 58 are currencyd. Then, the cooled hot water is circulated from the heat storage pipe 44 b passing through the inside of the underground portion 58 to the fuel cell 40 and used for cooling the fuel cell 40. For example, hot water of about 70 degrees generated by the fuel cell 40 is cooled to about 40 degrees by the heat storage body 48 and the underground portion 58 and used again for cooling the fuel cell 40.

  At one end of the hot water supply pipe 46, for example, water supplied from a water pipe is introduced into the hot water supply pipe 46a of the underground portion 58. The water introduced into the hot water supply pipe 46 a is guided to the heat storage body 48 after passing through the underground portion 58, and is supplied from the hot water supply pipe 46 b inside the heat storage body 48 to the hot water supply equipment 56. The water flowing through the hot water supply pipe 46 is heated while passing through the underground portion 58 and the heat storage body 48 and supplied to the hot water supply facility 56 using the hot water supply pump 72.

  The hot water supply facility 56 is, for example, a water heater or an air conditioner including a bath, a shower, a washing surface, and the like, and consumes hot water supplied from the hot water supply pipe 46. Moreover, the hot water supply equipment 56 may be a device that takes out the amount of heat from the hot water and uses it to discharge the hot water having a lowered temperature, like a hot water floor heater that warms the floor with hot water.

  Further, the hot water supply pipe 46 is provided with a heating device 64 for heating the hot water in the hot water supply pipe 46. The warming device 64 warms the hot water in the hot water supply pipe 46 when the water temperature in the hot water supply pipe 46 after passing through the heat storage body 48 is lower than a predetermined temperature range as compared with the temperature required by the hot water supply equipment 56. Warm up. The warming device 64 is, for example, a burner, and warms hot water flowing through the hot water supply pipe 46 by the amount of heat generated by the combustion of the burner. Further, the heating device 64 may be a heat pump that operates with electric power generated by the fuel cell 40.

  A side heat insulating material 52 is provided on the side surface of the foundation 74 in order to insulate between the heat storage body 48 and the underground portion 58 and the foundation 74. The upper part of the heat storage body 48 is covered with the upper heat insulating material 50, and the upper heat insulating material 50 extends to the vicinity of the side heat insulating material 52. The external heat insulating material 54 provided below the ground outside the floor is in contact with the foundation 74 and extends substantially horizontally. The external heat insulating material 54 insulates between the underground portion 58 and the ground outside the space under the floor. The external heat insulating material 54 is preferably in contact with the lower side of the foundation 74 in order to further reduce the amount of heat radiation from the underground portion 58 to the foundation 74. Further, it is desirable that the external heat insulating material 54 extends to a position away from the foundation 74 by 1 m or more. In addition, as for the upper heat insulating material 50, the side part heat insulating material 52, and the external heat insulating material 54, it is desirable that the heat conductivity in normal temperature is 0.065 W / m * K or less.

  Thus, by providing the upper heat insulating material 50 and the side heat insulating material 52, the heat radiation from the heat storage body 48 to the floor can be reduced, and the heat radiation from the heat storage body 48 and the underground portion 58 to the foundation 74 can be reduced. it can. For this reason, when the building 42 is a residence or the like, for example, in summer, it is possible to prevent the deterioration of the habitability due to the heat transfer from the heat storage body 48 and the underground portion 58 and the temperature of the underfloor and the foundation 74 rising. Further, the external heat insulating material 54 can reduce the amount of heat accumulated in the underground from the ground.

  Further, in the heat storage system 30 of the present embodiment, in the underground portion 58, no heat insulating material having a lower thermal conductivity than the underground portion 58 is provided further below the lowest heat storage pipe 44. Therefore, since heat is transmitted downward in the underground portion 58, the amount of heat of the hot water flowing through the heat storage pipe 44 is radiated downward from the lowest heat storage pipe 44. For this reason, even when the fuel cell 40 generates heat exceeding the heat storage capacity of the heat storage body 48, the hot water flowing through the heat storage pipe 44 can be cooled in the underground portion 58. It is possible to prevent the battery 40 from being stopped due to insufficient cooling.

  Moreover, in the heat storage system 30 of this embodiment, the underfloor condensation prevention piping 45 which prevents the dew condensation under the floor by heating the foundation 74 is provided. The underfloor condensation prevention pipe 45 is installed in the vicinity of the foundation 74 that is not insulated from the underfloor, and the hot water generated by the fuel cell 40 flows through the inside. No heat insulating material is provided between the underfloor condensation prevention pipe 45 and the foundation 74. The term “heat insulating material” as used herein may mean a member having a thermal conductivity of 0.065 W / m · K or less at room temperature. For example, a heat storage body 48 such as concrete having a thermal conductivity of about 1.6 W / m · K is provided between the foundation 74 and the side heat insulating material 52 in contact with the foundation 74, and the underfloor condensation prevention pipe 45 is It is provided inside the heat storage body 48. Therefore, the amount of heat transferred from the underfloor condensation prevention pipe 45 to the floor under the unit temperature difference per unit time is larger than the amount of heat transferred per unit time per unit time from the heat storage pipe 44 under the floor. For this reason, by flowing warm water through the underfloor condensation prevention piping 45, the foundation 74 can be effectively heated as compared with the case where warm water is flowed through the heat storage piping 44. The heat storage pipe 44 is provided with a hot water valve 60 and a hot water return valve 62, to which one end of an underfloor condensation prevention pipe 45 is connected. The hot water valve 60 controls the amount of hot water flowing into the underfloor condensation prevention pipe 45, and the hot water return valve 62 controls the amount of hot water flowing into the fuel cell 40 from the underfloor condensation prevention pipe 45. The hot water valve 60 and the hot water return valve 62 are controlled so that the amount of hot water flowing through the underfloor dew condensation prevention pipe 45 becomes the amount of hot water necessary for dehumidification under the floor. It is desirable that the underfloor condensation prevention pipe 45 is provided in the vicinity of a foundation located inside the outer peripheral foundation of the building 42, such as a partition foundation. The underfloor condensation prevention pipe 45 may be provided inside the foundation 74 or may be provided in contact with the foundation 74 in a space under the floor. The underfloor condensation prevention pipe 45 may be provided so that air in the underfloor space can come into contact with the underfloor condensation prevention pipe 45.

  In this way, it is possible to prevent dew condensation under the floor by heating the foundation 74 with the hot water generated by the fuel cell 40 flowing through the underfloor condensation prevention piping 45 and raising the temperature under the floor. For this reason, deterioration of the building 42 due to condensation under the floor can be prevented. In addition, since the underfloor condensation prevention pipe 45 may be installed in the vicinity of the foundation 74, the construction for installing the underfloor condensation prevention pipe 45 is easy.

  Further, an underfloor thermometer 66 that detects the temperature of the space under the floor is provided under the floor, and an external thermometer 68 that detects the temperature of the space under the floor is provided outside the floor. Further, the control unit 80, when the underfloor temperature detected by the underfloor thermometer 66 is further lower than a predetermined temperature range compared to the temperature of the external space under the floor detected by the external thermometer 68, The hot water valve 60 and the hot water return valve 62 are controlled so that the hot water generated by the fuel cell 40 is passed through the underfloor condensation prevention pipe 45.

  As described above, when the control unit 80 determines that dehumidification under the floor is necessary based on the temperature of the space under the floor and the temperature of the space under the floor, the controller 80 supplies hot water to the underfloor condensation prevention pipe 45. Therefore, the foundation 74 can be heated only when condensation is likely to occur under the floor. By doing so, when the building 42 is a residence, for example, it is possible to minimize the deterioration of the habitability due to the rise in the temperature of the foundation 74 particularly in summer.

  Further, the control unit 80 may control the hot water to flow through the underfloor dew condensation prevention pipe 45 when the amount of exhaust heat generated by the fuel cell 40 is excessive as compared with the amount of heat consumed by the hot water supply facility 56. In particular, in summer when there is little demand for hot water supply, surplus warm water is often generated by the fuel cell 40. By controlling to perform dehumidification under the floor when such a situation occurs, it is possible to effectively use the amount of heat of the hot water produced excessively.

  FIG. 2 is a diagram illustrating an example of a piping system of the heat storage system 30. The heat storage pipe 44 is provided so that the hot water generated by the fuel cell 40 first passes through the heat storage body 48 and then passes through the underground portion 58. Thus, while maintaining the temperature of the heat storage body 48 higher than the underground part 58, the underground part 58 absorbs the amount of heat which is not absorbed by the heat storage body 48.

  And the hot water supply pipe 46 passes the inside of the thermal storage body 48 in which the temperature is maintained higher than the underground part 58 after warm water supplied to the hot water supply equipment 56 is passed through the underground part 58 and heated in advance. For this reason, the temperature of the hot water in the hot water supply pipe 46 heated by passing through the underground portion 58 can be further raised by the heat storage body 48 and supplied to the hot water supply facility 56. Moreover, since the thermal conductivity of the heat storage body 48 is higher than that of the underground portion 58, the hot water flowing through the hot water supply pipe 46 can be heated more quickly than the underground portion 58. Moreover, since the warm water of the hot water supply pipe 46 is preheated by passing through the underground portion 58, the amount of decrease in the temperature of the heat storage body 48 due to the amount of heat absorbed by the warm water can be reduced, compared with the case where the underground portion 58 does not preheat. Hot water having a high temperature can be supplied to the hot water supply facility 56 over a longer period.

  Moreover, in the underground part 58, the thermal storage piping 44 is arrange | positioned so that the warm water which flows through the thermal storage piping 44 may flow from upper direction to the downward direction. Further, the heat storage pipe 44 is arranged so that the hot water flowing through the hot water supply pipe 46 flows from the lower side to the upper side. By arranging the heat storage pipe 44 and the hot water supply pipe 46 in this way, the hot water flowing through the hot water supply pipe 46 can be heated without waste.

  Further, in the hot water supply facility 56, there is a facility such as a hot water floor heating apparatus that takes out only the amount of heat from the supplied hot water and uses it to discharge the hot water whose temperature has decreased. Such hot water discharged from the hot water supply facility 56 is introduced again into the hot water supply pipe 46 without being discharged outside the heat storage system 30, heated by the underground portion 58 and the heat storage body 48, and used again in the hot water supply facility 56. By doing so, energy waste can be reduced. In this case, when a pipe connected to the part of the heat storage pipe 44 that passes through the inside of the heat storage body 48 is installed and the temperature of the hot water discharged by the hot water supply equipment 56 is equal to or higher than a predetermined reference value, You may control to flow the warm water which the installation 56 discharges. As a result, even when the temperature of the hot water discharged from the hot water supply facility 56 is higher than the temperature of the underground portion 58, the amount of unused heat contained in the hot water discharged from the hot water supply facility 56 can be used without wasting it.

  Normally, city water is introduced into the hot water supply pipe 46, and hot water obtained by heating the city water with the amount of heat stored in the underground portion 58 and the heat storage body 48 is supplied to the hot water supply facility 56. Normally, city water is supplied through an underground water pipe, so the city water and underground are at substantially the same temperature. Therefore, since the temperature of city water is usually lower than the surrounding underground part 58 through which the heat storage pipe 44 passes, the temperature of the hot water flowing through the hot water supply pipe 46 does not decrease in the underground part 58.

  In addition, another modification of the heat storage system 30 in the present embodiment is a system in which the fuel cell 40 is an apparatus that simultaneously generates power and supplies heat using a combustible fuel such as fossil fuel, hydrogen gas, or a biological organism. is there. Examples of such a device include a gas engine and a gas turbine. Also in this modification, it is obvious that the same effect as that described in the present embodiment can be obtained.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements are also included in the technical scope of the present invention.

An example of composition of building 42 provided with heat storage system 30 concerning an embodiment of the present invention is shown. An example of the piping system of the heat storage system 30 is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 40 ... Fuel cell, 42 ... Building, 44 ... Heat storage piping, 45 ... Underfloor dew condensation prevention piping, 46 ... Hot water supply piping, 48 ... Heat storage body, 50 ... Upper heat insulation Material, 52 ... side heat insulation material, 54 ... external heat insulation material, 56 ... hot water supply equipment, 58 ... underground part, 60 ... hot water valve, 62 ... hot water return valve, 64 ..Heating device, 66 ... Underfloor thermometer, 68 ... External thermometer, 70 ... Heat storage pump, 72 ... Hot water pump, 74 ... Base, 76 ... Floor, 78 ..Vents, 80 ... control unit

Claims (11)

  A cogeneration system that generates waste heat along with power generation,
  A heat storage body provided to store the exhaust heat of the cogeneration device under the floor of the building,
  The hot water generated by receiving the exhaust heat of the cogeneration device to cool the cogeneration device is passed inside the heat storage body, and the exhaust heat of the cogeneration device is passed through the heat storage body. A heat storage pipe that absorbs and cools the warm water, and supplies the cooled warm water to the cogeneration device;
  The heat storage body is located below the heat storage body and has a lower thermal conductivity than the heat storage body and is provided inside the heat storage body, and absorbs the amount of heat stored in the heat storage body and the basement section to absorb the inside. A hot water supply pipe for heating the water to flow and supplying the heated water to the hot water supply facility;
  Side heat insulating materials covering side surfaces of the plurality of foundations in order to insulate between the heat storage body and the basement and the plurality of foundations of the building,
  An upper heat insulating material covering an upper portion of the heat storage body and extending to the vicinity of the side heat insulating material;
  An external heat insulating material that is in contact with the plurality of foundations and that is provided below the ground outside the floor and spreads substantially horizontally in order to insulate between the basement and the ground outside the space under the floor,
  Underfloor dew condensation prevention piping in which the amount of heat transfer per unit time difference per unit time to the underfloor is larger than the heat storage piping;
  When the temperature under the floor is lower than the temperature of the external space under the floor, the hot water is passed through the underfloor condensation prevention pipe so as to prevent the condensation under the floor by increasing the temperature under the floor. Control unit
With
  The plurality of foundations surround the space under the floor where the heat storage body is provided,
  The heat storage pipe is further provided below the plurality of foundations in the underground part,
  The heat storage pipe allows the hot water to pass through the inside of the heat storage body and then the underground portion to maintain the temperature of the heat storage body higher than the underground portion and to absorb heat that is not absorbed by the heat storage body. The hot water flowing through the interior is cooled by being absorbed by the underground part, and the cooled hot water is supplied to the cogeneration apparatus.
Thermal storage system.   The hot water supply pipe further increases the temperature of water supplied to the hot water supply facility after passing through the inside of the heat storage body after preheating the water supplied to the hot water supply facility through the underground portion. Item 2. The heat storage system according to Item 1. The side heat insulating material is provided between the underfloor condensation prevention pipe and the heat storage body,
The underfloor condensation prevention pipe is provided in the vicinity of the side portions of the plurality of foundations that are not thermally insulated from the underfloor, and no heat insulating material is provided between the plurality of foundations and the underfloor condensation prevention pipes. The heat storage system according to claim 1 or 2 .   A cogeneration system that generates waste heat along with power generation,
  A heat storage body provided to store the exhaust heat of the cogeneration device under the floor of the building,
  The hot water generated by receiving the exhaust heat of the cogeneration device to cool the cogeneration device is passed inside the heat storage body, and the exhaust heat of the cogeneration device is passed through the heat storage body. A heat storage pipe that absorbs and cools the warm water, and supplies the cooled warm water to the cogeneration device;
  The heat storage body is located below the heat storage body and has a lower thermal conductivity than the heat storage body and is provided inside the heat storage body, and absorbs the amount of heat stored in the heat storage body and the basement section to absorb the inside. A hot water supply pipe for heating the water to flow and supplying the heated water to the hot water supply facility;
  Underfloor condensation prevention piping provided in the vicinity of the sides of a plurality of foundations of the building,
  Side heat insulating material provided between the underfloor dew condensation prevention pipe and the heat storage body to insulate between the heat storage body and the underground portion and the plurality of foundations,
  An upper heat insulating material covering an upper portion of the heat storage body and extending to the vicinity of the side heat insulating material;
  When the temperature under the floor is lower than the temperature of the external space under the floor, the hot water is passed through the underfloor condensation prevention pipe so as to prevent the condensation under the floor by increasing the temperature under the floor. Control unit
With
  The plurality of foundations surround the space under the floor where the heat storage body is provided,
  The heat storage pipe is further provided below the plurality of foundations in the underground part,
  The heat storage pipe allows the hot water to pass through the inside of the heat storage body and then the underground portion to maintain the temperature of the heat storage body higher than the underground portion and to absorb heat that is not absorbed by the heat storage body. The hot water flowing through the interior is cooled by being absorbed by the underground part, and the cooled hot water is supplied to the cogeneration apparatus.
Thermal storage system.   The hot water supply pipe further increases the temperature of water supplied to the hot water supply facility after passing through the inside of the heat storage body after preheating the water supplied to the hot water supply facility through the underground portion. Item 5. The heat storage system according to Item 4. Further comprising a heat storage for preventing condensation provided between the foundation and the side heat insulating material in contact with the plurality of foundations,
The heat storage system according to any one of claims 3 to 5, wherein the underfloor dew condensation prevention pipe is provided inside the dew condensation prevention heat storage body. The heat storage system according to any one of claims 3 to 6 , wherein the underfloor dew condensation prevention pipe is provided in the vicinity of a foundation located on the inner side of the outer peripheral foundation of the building among the plurality of foundations. The heat storage system according to claim 7 , wherein the underfloor condensation prevention pipe is provided in the vicinity of a partition base of the building. An underfloor thermometer for detecting the underfloor temperature;
An external thermometer for detecting the temperature of the external space under the floor;
Further comprising
The control unit increases the underfloor temperature when the underfloor temperature detected by the underfloor thermometer is lower than the temperature of the external space under the floor detected by the external thermometer. The heat storage system according to any one of claims 1 to 8 , wherein the hot water is passed through the underfloor condensation prevention pipe so as to prevent the underfloor condensation. The heat storage system according to any one of claims 1 to 9 , wherein the cogeneration apparatus is a fuel cell. A building comprising the heat storage system according to any one of claims 1 to 10 .

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