JP2010151351A - Underground heat exchanger burying structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground heat exchanger burying structure for achieving ground heat utilization low in the installation cost of a ground heat exchanger and excelling in heat exchange effectiveness. <P>SOLUTION: A foam resin board is laid abutting on the bottom face of a mat foundation generally executed as a foundation structure of a building, or abutting on the bottom face of a foundation slab in a pile foundation, and a horizontal underground heat exchanger is buried below the foam resin board. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a buried structure of a geothermal heat exchanger, and more particularly, to use geothermal heat that has a high heat exchange rate and can be implemented at low cost when using geothermal heat in air conditioning or hot water supply of a building. The present invention relates to an underground heat exchanger embedded structure.

In recent years, awareness of the importance of environmental issues and energy issues has increased, and interest in geothermal use has increased. As a typical technology for geothermal utilization, a geothermal heat exchanger is embedded in the ground, a heat medium is circulated through the geothermal heat exchanger, and heat is exchanged between the underground heat and the heat medium, The method of collect | recovering is mentioned. In the above heat exchanger, a tall underground heat exchanger is embedded substantially perpendicular to the ground surface, and the vertical type uses geothermal heat in a relatively deep ground area, and the ground at a shallow depth near the ground surface. It is roughly divided into two types of horizontal type that are arranged horizontally with respect to the surface, and those that incorporate a heat medium inside the pile or those that place an underground heat exchanger around the pile are also vertical types being classified.

As an example of the vertical underground heat exchanger, for example, in Patent Document 1, a plurality of concentric double tubes are embedded vertically in the ground, and a heat medium is supplied from the upper end of the inner tube. An invention of a geothermal heat exchanger (hereinafter, also referred to as “prior art 1”) that collects geothermal heat when it is inverted at the lower end and passed through the outer pipe upward is disclosed. Prior art 1 is trying to improve the collection efficiency of geothermal heat by specifying the interval of embedding of a concentric double pipe, the flow rate of the heat medium which circulates inside, etc. Moreover, in patent document 2, in the main body hollow part of an existing pile, the piping for heat exchange which a heat medium flows is installed, and at least one part of the piping is bellows-shaped, The underground heat exchanger characterized by the above-mentioned. The invention (hereinafter also referred to as “prior art 2”) is disclosed. Prior art 2 has a pipe in which the heat medium flows in the internal space of the pile, and at least a part of the pipe is on a bellows, thereby increasing the surface area of the pipe and improving the heat exchange rate. I'm trying.

  On the other hand, as an example of a horizontal type underground heat exchanger, for example, Patent Document 3 discloses an underground continuous wall provided up to a position deeper than a groundwater level in the ground, and a water outlet provided in the underground continuous wall. And heat exchange means provided in the ground downstream of the underground continuous water flow, and the heat exchange means performs heat exchange with the groundwater flow passing through the water passage In the invention of the system, an aspect using a horizontal underground heat exchanger (hereinafter also referred to as “prior art 3”) is disclosed. Prior art 3 is a heat exchange system for the purpose of exchanging heat with the groundwater flow, not the heat of the soil in the ground.

JP 2003-307352 A JP 2004-177013 A JP 2008-275263 A

By the way, although the temperature in the ground depends on the region, generally, it is greatly affected by the outside temperature on the ground up to a depth of about 10 m from the ground surface, and there is a temperature difference throughout the year, especially about a depth of about 5 m. The difference in temperature is remarkable up to the vicinity. On the other hand, at a depth of 10 m or less, it is known that the temperature of the ground is stable throughout the year. Therefore, in consideration of the above-mentioned ground temperature, in the winter season, geothermal heat is recovered by the heat medium, and in the summer, the heat medium temperature is absorbed by the geothermal heat, and a high heat exchange rate is realized by a depth of 10 m. It is desirable to exchange heat at the following deep points. From this point of view, a vertical underground heat exchanger in which a long underground heat exchanger is embedded vertically so that its tip reaches an area exceeding a depth of 10 m. Is suitable for use. However, in order to embed the underground heat exchanger at a depth exceeding 10 m, the work labor and installation cost for installation are high, and the heat medium flows up and down in the tall underground heat exchanger. There was a problem that the running cost was high. In addition, there are many cases where the inside of the apparatus is complicated, and there is a problem that a failure is likely to occur and maintenance may be required. In this specification, “summer” and “winter” refer to summer and winter in the northern hemisphere.

  On the other hand, horizontal underground heat exchangers are generally embedded near the surface of the earth, so the installation cost is low, and since they are arranged horizontally, less energy is required for circulation of the internal heat medium. Has the advantage of low running costs. Also, the mechanism of the device is simple compared to the vertical type. However, the ground temperature near the ground surface is not stable as described above, and the temperature rises in summer and falls in winter. Therefore, the heat exchange rate is low, making it a vertical underground heat exchanger. In comparison, there was a problem that the heat exchange rate per fixed area was low. Further, when water is used as the heat medium, there is a risk that the water as the heat medium will freeze in the pipe in winter. Although the technique of exchanging heat with a groundwater flow has been proposed as in the above-described conventional technique 3, the heat exchange rate depends on the presence or absence of an available groundwater flow, the flow rate of the groundwater flow, and the like. Technology has not been provided. In general, when a horizontal geothermal exchanger is embedded in a site, there are restrictions on the site, and if the site is excavated after being embedded, the embedded geothermal exchanger may be damaged. For this reason, few practical examples are known.

  This invention is made | formed in view of the said problem, Comprising: It aims at providing the underground heat exchanger embedding structure for implement | achieving geothermal utilization with low installation cost and excellent heat exchange rate. .

  The inventor makes the foamed resin board by laying the foamed resin board in contact with the bottom surface of the solid foundation generally implemented as the foundation structure of the building or in contact with the bottom surface of the foundation slab in the pile foundation. Played the role of a heat insulating layer, and as a result, the knowledge that the ground temperature near the ground surface is stabilized was obtained. And if it is an environment where the ground temperature is stable in the vicinity of the ground surface in this way, it is found that the geothermal heat can be recovered with a very high heat exchange rate by burying a horizontal type underground heat exchanger, The present invention has been achieved.

That is, the present invention
(1) A solid foundation provided as a foundation structure of a building, a foamed resin board laid in contact with the bottom surface of the solid foundation, and a horizontal underground heat exchanger buried under the foamed resin board Underground heat exchanger embedded structure, characterized in that,
(2) a pile foundation provided with a foundation slab and a pile body, which is provided as a foundation structure of a building, and a foamed resin board which is an area excluding the pile body portion and is laid in contact with the bottom surface of the foundation slab; An underground heat exchanger embedding structure characterized in that it is composed of a horizontal underground heat exchanger that is an area excluding the pile body part and is embedded below the foamed resin board,
(3) The horizontal underground heat exchanger has an inlet and an outlet for the heat medium at both ends, and can circulate the heat medium inside, and extends in a substantially horizontal direction with respect to the ground surface. The underground heat exchanger embedment structure according to the above (1) or (2),
(4) The horizontal underground heat exchanger is a pipe that extends in a substantially horizontal direction with respect to the ground surface and is capable of circulating a heat medium inside (1) or ( Underground heat exchanger buried structure as described in 2),
(5) The ground heat exchange according to any one of (1) to (4), wherein a grout material is filled between the horizontal underground heat exchanger and the ground. Embedded structure,
(6) The ground covering concrete provided continuously from the outer side surface of the solid foundation or the building constructed on the solid foundation is provided in at least a part of the circumference of the solid foundation or the structure; and The foamed resin board is further laid in contact with at least a part of the bottom surface of the ground covering concrete, and the horizontal underground heat exchanger is also buried below the ground covering concrete. The underground heat exchanger embedded structure according to any one of claims 1 to 5,
Is a summary.

  According to the present invention, the foamed resin board provided under the foundation slab in the solid foundation or the pile foundation serves as a heat insulating layer for insulating the outside air temperature from the ground, and in a shallow ground having a depth of less than 10 m from the ground surface. Also, stable ground temperature is shown throughout the year. Therefore, as in the prior art, the horizontal underground heat exchanger can be replaced with the horizontal underground heat exchanger without burying the vertical underground heat exchanger in the deep ground having a stable ground temperature of 10 m or more. By embedding under the foamed resin board, a very excellent heat exchange rate can be realized.

In addition, in the geothermal exchanger buried structure of the present invention, not only to secure a land for embedding the geothermal exchanger, but mainly because the geothermal exchanger is buried below the basic structure of the building, effective use of the land Is planned. Therefore, even if it is a horizontal type geothermal exchanger which requires a buried area rather than a vertical type geothermal exchanger, it can be implemented without having to consider securing the site.

  A horizontal geothermal heat exchanger is low in installation cost and can exchange heat with geothermal heat by simply circulating a heat medium inside the geothermal heat exchanger with a simple structure such as a pipe. It has the merit that maintenance is not necessary. In addition, when a horizontal underground heat exchanger is embedded in a shallow area within a depth of 10 m from the ground surface (or within 2 m below the foamed resin board), the resistance of the heat medium that circulates in the device is reduced. Since it is small, the energy for pumping can be small, and as a result, it has the merit that it is energy efficient and can be implemented at a lower running cost than the vertical type. Therefore, it can be said that the technical advance made by the achievement of the present invention is that the horizontal underground heat exchanger having the above-mentioned merit can be used at a high heat exchange rate.

  Moreover, as a secondary effect of the present invention, according to the geothermal exchanger embedded structure of the present invention, the foundation slab in the solid foundation or the pile foundation serves as a heat storage layer, and the upper part of the solid foundation or foundation slab This makes it possible to make the air conditioning of the building constructed more stable (hereinafter simply referred to as “the heat storage effect of a solid foundation or a foundation slab”). In other words, by installing a foamed resin board under the solid foundation or foundation slab, the temperature from the ground is not directly transmitted to the solid foundation or foundation slab. It is difficult to dissipate heat to the ground through the slab, and exerts an endothermic effect when heating is used, and exerts a heat radiating effect when heating is not used. As a result, it is possible to effectively implement a method of storing heat at night using inexpensive nighttime power. On the other hand, in summer, when the cooling is used, a slight heat dissipation action is exhibited, and when the cooling is not used, the heat absorption action is exhibited, so that the air conditioning is stably maintained and the cooling efficiency is increased.

  Therefore, the present invention makes the heat exchange rate of a horizontal underground heat exchanger highly efficient, and the solid foundation or foundation slab acts as a heat storage layer, so the thermal efficiency of the air conditioning of the building is very stable. Therefore, the utility cost can be significantly reduced. Therefore, it is very effective in terms of saving energy consumption and reducing carbon dioxide emissions.

  In addition, the foamed resin board can exert the effect of supporting and stably supporting the load of the building transmitted from the solid foundation or foundation slab, and when vibration such as earthquake occurs, the vibration is Since it can be attenuated in the foamed resin board, it can also exhibit earthquake resistance. For this reason, in the case of a buried structure in which a horizontal heat exchanger is buried under the foamed resin board, even if vibration occurs due to an earthquake or the like, the load from the building, ground fluctuation, etc. The risk of breakage and the like is significantly reduced compared to the prior art (hereinafter also simply referred to as “protective effect of the geothermal exchanger”). In particular, in the case of a pile foundation structure, the foam body itself is protected in the event of vibration such as an earthquake by laying a foamed resin board in contact with the bottom surface of the foundation slab and in contact with the side surface of the pile body. Also effective. In addition, if a geothermal exchanger is buried in a site where no buildings are constructed, the site where the geothermal exchanger is buried may be dug up after burial due to sewage work or land maintenance. It was a problem that the pipe could be damaged. However, in the present invention, since the ground exchanger is buried in the ground below the foundation of the building, there is no possibility of excavating the site, and there is no possibility of damaging the pipe due to later construction. This is a very advantageous effect.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional explanatory view showing an underground heat exchanger embedded structure of the present invention using two types of geothermal exchangers. As shown in the left side of the drawing, the underground heat exchanger embedded structure 1 of the present invention is a solid foundation composed of a reinforced concrete surface 5 formed flat and an underground beam 6 extending downward from the concrete surface 5. 2, a foamed resin board 3 laid in contact with the lower surface of the solid foundation 2, and a horizontal geothermal exchanger 4 </ b> A buried under the foamed resin board 3. In addition, a drainage layer 7 is provided in contact with the bottom surface of the foamed resin board 3 to cope with permeated water such as rainwater in the surface ground. The drainage layer 7 is a layer composed of a sand layer, a crushed stone layer, and a civil engineering sheet from the foamed resin board 3 side, and is a layer provided to improve drainage of the ground and prevent softening of the ground. is there. The drainage layer 7 has an arbitrary configuration in the present invention.

  2A is an XX cross-sectional view of the geothermal exchanger embedded structure 1 shown in FIG. As shown in FIG. 2A, the geothermal exchanger embedded structure 1 of the present invention is laid on the geothermal exchanger 4 </ b> A composed of a pipe 13 embedded so that the geothermal exchanging portion is substantially horizontal to the ground surface, and above the geothermal exchanger 4 </ b> A. It is comprised from the foaming resin board 3 and the solid foundation 2 constructed | assembled so that the upper surface of the foaming resin board 3 may be contact | connected. The geothermal exchanger 4A may be directly embedded in the ground as shown in FIG. 2A, but as shown in FIG. 2B, a grout material 104 is filled between the ground and the geothermal exchanger 4A. Also good. At this time, as the grout material, a conventionally known material can be appropriately selected and used. However, in order to increase the heat exchange rate at the time of geothermal heat exchange, the heat conductivity is particularly higher than that of sand or crushed stone. It is desirable to use a high-kneaded mortar as the grout material.

  The geothermal exchanger 4 </ b> A is a geothermal exchanger composed of a pipe 13 having an external air flow inlet 11 and an external air discharge port 12 at an end, and is a type of geothermal exchanger that uses external air as a heat medium. As shown in FIG. 1, the external air flow inlet 11 that is one end of the pipe extends from the ground to the outside, while the other end of the pipe penetrates the foamed resin board 3 and the solid base 2 to be solid. It extends into the room of the building 101 built above the foundation 2. In the cross-sectional view of FIG. 1, only the geothermal exchanger is illustrated from a perspective perspective in order to facilitate understanding of the horizontal type geothermal exchanger 4 </ b> A. Similarly, in the schematic cross-sectional view shown below, only the geothermal heat exchanger is illustrated from a perspective perspective rather than illustrating a cross section.

  In the underground heat exchanger burying structure 1, outside air is taken in from the outside air flow inlet 11 exposed to the outside, and outside air is sent into the inside by a pressure feeder or the like for sending outside air appropriately installed. Below, heat exchange is performed between the outside air and geothermal heat while circulating in the pipe 13. And the external air which became moderate temperature by heat exchange with geothermal heat can be sent in into the room | chamber interior from the external air discharge port 12. FIG. In addition, the building 101 is generally provided with an exhaust port such as an exhaust fan 102, whereby indoor air is exhausted. Therefore, according to the geothermal heat utilization system in which the outside air that has been subjected to the geothermal exchange in the geothermal exchanger embedded structure of the present invention is sent into the room and the indoor air is exhausted, sufficient ventilation can be performed with high thermal efficiency. desirable. In other words, indoor ventilation is necessary regardless of the season, but when taking outside air as it is and ventilating, the room temperature will be lowered unnecessarily in winter, while in summer the room temperature will be raised unnecessarily. As a result, the heating efficiency or the cooling efficiency was lowered. However, in the geothermal exchanger embedding structure 1 of the present invention shown in FIG. 1, when the outdoor air after the geothermal exchange is taken into the room, the outdoor air warmed by the geothermal heat can be taken into the room in the winter, and In the summer season, the outside air cooled by geothermal heat and cooled can be taken into the room, so that ventilation can be performed without reducing energy efficiency.

  Further, the geothermal exchanger embedded structure 1 ′ of the present invention shown on the right side of FIG. 1 includes a solid base 2, a foamed resin board 3 laid in contact with the solid foundation 2, and a horizontal type buried below the foamed resin board 3. It consists of a geothermal exchanger 4B. The geothermal exchanger 4B is a geothermal exchanger of a type that includes a closed pipe 15 having both ends connected to the air conditioner 14 and in which a heat medium circulates. As the heat medium in the geothermal exchanger 4B, liquids such as water, antifreeze water, and oil are mainly used.

  In the geothermal exchanger embedded structure 1 ′, the heat medium circulating in the geothermal exchanger 4 </ b> B exchanges heat with geothermal heat while circulating in the pipe 15, and then in a space provided between the floor 105 and the solid foundation 2. Indoor air conditioning can be performed by collecting the heat of the heat medium by air in the installed air conditioner 14 and allowing air to flow into the room from an air outlet 16 provided in the air conditioner 14.

  The geothermal exchanger embedded structures 1 and 1 ′ described above may be used together under a solid foundation supporting one building, or only one of them is implemented as shown in FIG. Also good. Moreover, the geothermal exchanger embedded structure mentioned above is only an example of the embodiment of the present invention, and within a range that does not depart from the gist of the present invention, it may be a buried structure of another aspect adopting a different horizontal geothermal exchanger. it can.

Next, the present invention employing a pile foundation will be described with reference to FIG. FIG. 3 is a schematic cross-sectional explanatory view showing geothermal exchanger embedded structures 41 and 41 ′ showing another aspect of the present invention. The geothermal exchanger embedment structures 41 and 41 ′ are different from the geothermal exchanger embedment structures 1 and 1 ′ shown in FIG. It is constructed in the same manner except that an underground pit 106 is provided. More specifically, the geothermal exchanger embedded structure 41 includes a pile foundation 44 including a concrete slab 43 that is a kind of foundation slab and a support pile body 42 in which a pile head is embedded in the concrete slab 43. The foamed resin board 3 is laid in contact with the lower surface of the concrete slab 43 except for the support pile body 42, and the drainage layer 7 is formed on the lower surface of the foamed resin board 3. The geothermal exchanger 4A is embedded below the geothermal exchanger 4A, and the geothermal exchanger embedded structure 41 of the present invention is completed. On the other hand, the geothermal exchanger embedded structure 41 ′ is similarly completed except that the geothermal exchanger 4 </ b> A in the geothermal exchanger embedded structure 41 is changed from the geothermal exchanger 4 </ b> B. The present invention employing a pile foundation is preferably implemented particularly under a building such as a high-rise building having a large load.

  As shown in FIG. 3, the geothermal exchanger embedded structures 41 and 41 ′ described above may be used together under a pile foundation that supports one building, or only one of them is implemented. Also good. Moreover, the geothermal exchanger embedded structure mentioned above is only an example of the embodiment of the present invention, and different modes can be adopted without departing from the gist of the present invention.

  In the present invention, the most important point is that a solid foundation or a pile foundation having a foundation slab and a pile body is selected as the foundation structure of the building, and a foamed resin board is laid in contact with the bottom surface of the solid foundation or foundation slab. As a result, the ground temperature below the foamed resin board is stabilized throughout the year even when the depth is less than 10 m, and thus, in a horizontal geothermal exchanger buried under the foamed resin board, It is in an efficient heat exchange. In addition, when arbitrary layers, such as a drainage layer, are provided under the foamed resin board in this invention, the geothermal exchanger should just be embed | buried under the said arbitrary layers.

  As mentioned above, when a foamed resin board is laid in contact with the bottom of a solid foundation or foundation slab, the ground temperature is constant regardless of whether it is a shallow area with a depth of less than 10 m from the ground surface, regardless of summer or winter. Maintained. It is a surprising finding that the ground temperature can be desirably maintained with such a simple structure. By obtaining such knowledge, in the geothermal exchanger embedding structure of the present invention that is very cheap and easy to construct, it is highly efficient even by using a horizontal geothermal exchanger in shallow ground. Successfully realized heat exchange.

  Below, the structure of this invention is demonstrated in detail in order of a solid foundation, a pile foundation, a foamed resin board, and a horizontal type geothermal exchanger.

[Solid basics]
The solid foundation in the present invention can be appropriately selected and implemented as long as it is a foundation structure understood as a solid foundation known as a foundation structure of a building. More specifically, it is a basic structure that is made by digging a necessary amount of ground including an area equivalent to the entire bottom surface of a building, placing reinforcing bars in it, and pouring concrete into it, and building the entire surface of the reinforced concrete surface. It is a basic structure mainly composed of a structure that disperses and supports the load. If necessary, the underground beam 6 may be provided at an arbitrary position on the bottom surface as provided in the solid foundation 2 in FIG. 1, or a so-called mat slab without an underground beam may be used. . In order to improve the seismic performance and heat insulation performance of the solid foundation, a solid foundation auxiliary structure 25 comprising a concrete layer 22, a foamed resin layer 23, and a drainage layer 7 is provided along the lower surface of the underground beam 6 in FIG. It has been. Implementation of the solid basic auxiliary structure 25 is optional in the present invention.

  Moreover, as shown in FIG. 4, the underground pit 106 may be provided in the building constructed | assembled on the underground heat exchanger embedding structure of this invention. Although not shown, a solid foundation as a foundation structure of a building including a basement is also included in the solid foundation of the present invention. In the case of a building with an underground pit or basement, a horizontal geothermal exchanger is buried in the ground that has been dug down if necessary, and a foamed resin board is laid above it. By constructing the solid foundation so that the bottom surface of the foundation is in contact, the underground heat exchanger embedding structure of the present invention is completed.

  As shown in FIG. 4, the underground heat exchanger embedded structure according to the present invention is further provided with a ground covering concrete 31 that is continuous with the solid foundation 2 and covers at least a part of the periphery of the building. A foamed resin board 3 ′ may be further laid in contact with at least a part of the bottom surface of the concrete 31, and a horizontal underground heat exchanger may be provided below the foamed resin board 3 ′. In FIG. 4, as a horizontal type geothermal exchanger embedded below the ground covering concrete 31 and the foamed resin board 3 ′, an external air inlet 11 and an external air outlet similar to the geothermal exchanger 4 </ b> A shown in FIG. 1 are used. 4, a geothermal exchanger 4 </ b> A composed of a pipe 13 provided with a geothermal exchanger 4, and a geothermal exchanger embedding auxiliary structure 1 ″ composed of a geothermal exchanger 4 </ b> A, a foamed resin board 3 ′, and ground covering concrete 31 is shown. The geothermal exchanger embedment structure of the present invention has a horizontal geothermal exchanger mainly embedded under a solid foundation and a foamed resin board laid in contact with the bottom surface. When it is expected that the amount of geothermal heat cannot be covered by the geothermal exchanger installed below the solid foundation, the desired amount of geothermal heat is provided by providing the geothermal exchanger embedding auxiliary structure 1 '' as described above. Can be secured.

  The ground-covered concrete 31 includes a concrete surface that is so-called dog-running and is placed around a building, but is not limited to this. The ground-covered concrete 31 is located at a position that covers a buried region of a horizontal geothermal exchanger. Any concrete surface may be used. That is, a concrete surface provided continuously from a solid foundation (if the building has an underground pit or basement, continuously from the outer side surface of the building), the foamed resin board is in contact with the bottom surface If it is installed, the ground temperature below the foamed resin board stabilizes as described above, so when a horizontal geothermal exchanger is embedded, the same effect as the underground heat exchanger embedded structure of the present invention is exhibited. can do.

The solid foundation shown in FIGS. 1 and 4 is not intended to limit the solid foundation in the present invention. The solid foundation formed of at least a reinforced concrete surface is a surface, and is in contact with at least a part of the lower surface of the foamed resin board. If it is solid basic structure which can be laid, it will not be limited in particular.
That is, it is important in the present invention that the ground temperature located below is stabilized by constituting a solid foundation and a foamed resin board in contact with the foundation, and if it is an aspect that enables this, it is selected as appropriate. Can be implemented.

[Pile foundation]
The pile foundation in the present invention is a foundation structure understood as a pile foundation known as a foundation structure of a building, and if it is a pile foundation having at least a pile body and a foundation slab, it can be appropriately selected and implemented. it can. More specifically, in the ground located on the lower surface of the building, the pile body is buried at an appropriately determined position, and the surface layer of the ground is dug as much as necessary, and directly or indirectly coupled to the pile body. Any pile foundation structure on which the foundation slab is constructed may be used. As needed, you may provide the underground beam 46 continuously with foundation slabs, such as concrete slab 43, so that it may be provided in the pile foundation 44 in FIG. In order to improve the seismic performance and heat insulation performance of the pile foundation 44, it is a pile body such as the outer side surface of the foundation slab such as the concrete slab 43 and the support pile body 42 in FIG. The water-permeable board 21 may be provided in the arbitrary side part which is not. A drainage layer 7 can optionally be provided under the foamed resin board 3.

In the present invention, the foundation slab is not particularly limited as long as it is a slab that is directly or indirectly coupled to the head of the pile in a known pile foundation and is constructed on substantially the entire bottom surface of the building. For example, the head of the pile head may be embedded directly in the foundation slab, or both may be directly connected, or the pile head is covered with concrete to reinforce the head of the pile. After performing the head treatment, the pile body and the foundation slab may be indirectly coupled by embedding in the foundation slab including part or all of the pile head treatment section. Alternatively, the pile head processing unit may be coupled to the beam and further coupled to the foundation slab via the beam. More specifically, the above-mentioned foundation slab means a slab structure formed as a part of a pile foundation structure on substantially the entire bottom surface of a building, and includes so-called concrete slab or soil concrete. The foundation slab can be optionally provided with underground beams. Moreover, in this invention, any thing may be sufficient as a pile body if it is a pile body employ | adopted in a well-known pile foundation structure. More specifically, the pile body may be either a support pile body or a friction pile body, or a combination thereof. That is, in the present invention, it is important to stabilize the ground temperature located below by constituting the basic slab and the foamed resin board in contact with the foundation slab. Can be selected and implemented.

[Foamed resin board]
The foamed resin board 3 in the present invention is a member laid in the ground in contact with at least a part of the bottom surface of the solid foundation described above. The conventional solid foundation has a ground directly below, and the temperature of the surface ground is greatly influenced by the outside air temperature throughout the year, and the temperature difference is large, and the ground temperature becomes the room temperature through the solid foundation. Also had an influence. In contrast, in the present invention, by laminating the foamed resin board in contact with the solid foundation, it is possible to block the temperature of the outside air (indoor temperature) from being transmitted to the ground, and the ground temperature can be stabilized throughout the year. The effect to maintain can be exhibited. Moreover, it is an effect exhibited by the laminated structure of the solid base and the foamed resin board that the solid foundation can act as a heat storage layer to reduce the difference in the indoor temperature throughout the day. In order to desirably obtain the above effect, it is desirable that the amount of the bottom surface of the solid foundation directly touching the ground is reduced, and that the foamed resin board is laid in a wider area between the solid foundation and the ground. Is preferably provided with the foamed resin board 3 in contact with 70% or more of the bottom surface area of the solid base 2, more preferably 80% or more, more preferably 90% or more, substantially Most preferably, the top surface of the foamed resin board is in contact with the entire bottom surface of the solid base 2. It should be noted that an embedded structure in which the upper surface of the foamed resin board is not laid in contact with the entire bottom surface of the solid foundation may be insufficient in terms of building support and earthquake resistance.
Moreover, as shown in FIG. 3, the foamed resin board should just be laid in contact with the bottom face of a solid foundation except the structural part required for a foundation structure, when a support pile body is used together with the solid foundation. Further, regarding the bottom area of the ground covering concrete 31 shown in FIG. 4 and the laying amount of the foamed resin board 3 ′ laid thereunder, the foamed resin board 3 and the solid foundation laid on the lower surface of the solid foundation 2 are also shown. It may be determined following the relationship between the two bottom areas. The description of the foamed resin board in the present invention described below includes the foamed resin board 3 'shown in FIG. 4 unless otherwise specified.

  In general, the foamed resin board in the present invention can be formed by arranging a plurality of foamed resin block bodies formed in an appropriate shape in the ground, but is not limited to this, and a known technique is applied. The foamed resin board layer may be formed in a desired region of the ground.

  The thickness of the foamed resin board may be appropriately determined according to the load of the building, the climate of the land to be implemented, and the like. Generally, by setting the thickness of the foamed resin board to about 10 cm to 50 cm, it can be applied to many environments. However, it is not limited to this.

The foamed resin board used in the present invention is preferably formed so as to exhibit a preferable thermal resistance value in order to insulate the outside air temperature from the ground and realize a desired heat exchange in the ground. The thermal resistance value of the foamed resin board corresponds to a value obtained by dividing the thickness of the foamed resin board by the thermal conductivity. The thermal resistance value of the foamed resin board used in the present invention is not particularly limited, but in general, the thermal resistance value is preferably 1.0 to 20.0 m ² · K / W, 2.0 to More preferably, it is 15.0 m ² · K / W. The numerical range of the thermal resistance value is not intended to limit the foamed resin board of the present invention, but by forming the foamed resin board within such a numerical range, a sufficient heat insulating effect can be exhibited in the foamed resin board. This makes it possible to make the annual temperature difference of the ground very small.
From the above viewpoint, the foamed resin board preferably has a thermal conductivity λ in the range of 0.02408 to 0.0387 (kcal / m · hr · ° C.). However, it is not limited to this. In the present specification, the thermal conductivity λ uses “kcal / m · hr · ° C.” as a unit, but 1 W / m · K = 0.86 kcal / m · hr · ° C. Converted to In this specification, “kcal” is used as a unit of heat quantity, but it is converted by 1 kcal = 1000 cal, 1 cal≈4.2 J.
Further, in order to exhibit seismic performance, which is a further additional effect in the present invention, it is further desirable to use a foamed resin board having an appropriate compressive strength in consideration of the load of the building. Although the desirable value of the compressive strength is remarkably different depending on the load of the building, it cannot be generally stated, but in general, it is preferably ³ to 50 t / m ² . The compressive strength can be measured using a short-term compressive strength measuring method shown in JIS K7220.

[Horizontal geothermal exchanger]
As the horizontal geothermal exchanger used in the present invention, a conventionally known horizontal geothermal exchanger can be appropriately selected and used. In the present invention, the “horizontal geothermal exchanger” is a geothermal exchanger that is distinguished from a vertical geothermal exchanger that uses piles or the like buried perpendicular to the ground surface, and the geothermal exchange portion is Means a geothermal exchanger provided substantially horizontally to the ground surface.

  As a typical example of the horizontal type geothermal exchanger, there is the one constituted by the pipe 13 or the pipe 15 through which the heat medium can circulate like the geothermal exchanger 4A or 4B shown in FIG. The pipe may be resinous or formed of a metal material such as stainless steel, aluminum, steel, or copper. However, metal pipes have problems such as corrosion, heat medium leakage from the seam, and problems such as breakage when the ground shape is deformed. Is desirable.

In the present invention, it is desirable that the horizontal geothermal exchanger is embedded at a position below the foamed resin board and within an area of the foamed resin board. More specifically, when observed from a direction perpendicular to the ground surface, the geothermal heat of the geothermal exchanger is placed in a region below the foamed resin board and 1 m or more inside the outer edge of the foamed resin board. It is desirable to have a replacement pipe. This is because the area less than 1 m from the outer edge of the foamed resin board is easily affected by the outside air temperature.
The distance from the ground surface of the horizontal geothermal exchanger is determined in consideration of the distance from the foamed resin board. In the present invention, as described above, even if the depth is less than 10 m from the ground surface, Since the ground temperature is stable through, even if a geothermal exchanger is embedded in such a surface ground, highly efficient geothermal exchange is realized. However, in the present invention, it is not excluded to embed a geothermal exchanger in a deeper ground having a depth exceeding 10 m. For example, in the geothermal exchanger buried structure of the present invention having a solid foundation for supporting a building having a basement structure including an underground pit, the depth of the ground where the geothermal exchanger is buried is inevitably depending on the scale of the basement structure. May exceed 10 m. Thus, even when a geothermal exchanger is embedded at a depth where the ground temperature is considered to be stable regardless of the presence of the foamed resin board, the solid foundation or the foundation slab, which is a secondary effect of the present invention, is further provided. Since the heat storage effect or the protection effect of the geothermal exchanger is exhibited, the present invention is sufficiently beneficial.

  On the other hand, the distance from the lower surface of the foamed resin board to the upper surface of the geothermal exchanger is not particularly limited, but it is preferable that the distance between the two is embedded so as not to contact. More specifically, the distance from the lower surface of the foamed resin board to the upper surface of the geothermal exchanger is preferably about 10 cm or more and less than 2 m. Moreover, when providing a drainage layer further in the lower surface of a foamed resin board, the geothermal exchanger may be similarly embed | buried in the position close | similar to a drainage layer. The specific distance is the same as the distance to the above-described foamed resin board.

The internal system of the pipe is not particularly limited, and can be appropriately determined according to a pipe used in a known horizontal geothermal exchanger. Generally, the inner diameter of the pipe is about 1 cm or more and less than 20 cm.
On the other hand, the length of the pipe is determined from the desired amount of geothermal heat exchange, the area of the solid foundation, and the like. If the desired pipe length does not fit within the area of the foundation structure of the building, bury two or more horizontal geothermal exchangers in parallel with the ground surface. Also good. Alternatively, as illustrated in FIG. 4, a ground covering concrete continuous with the foundation structure is provided, protruding from the foundation structure, and a horizontal geothermal exchanger or a part thereof is buried under the ground covering concrete. By doing so, the required length of the pipe may be secured.

The heat medium for circulating through the geothermal exchanger and exchanging heat with geothermal heat may be any gas such as air, or liquid such as water, antifreeze, or oil. After taking outside air as a heat medium from the outside and exchanging heat with geothermal heat, the outside air is taken into the room directly in the summer or through the dehumidifier or filter, and in the summer, air having a lower temperature than the outside outside air is taken into the room In winter, air having a temperature higher than that of the outdoor air can be taken into the room. As a result, the room temperature change can be reduced as compared with the case where ventilation is performed by directly taking in outside air from a ventilation port or window, and ventilation can be performed without reducing the heating efficiency and the cooling efficiency. Conventionally, as a liquid heat medium in a cold region, it has been common to use an antifreeze liquid due to the problem of freezing in winter. However, in the geothermal exchanger embedded structure of the present invention, the ground temperature is constant throughout the year. Even in cold regions, it is possible to design the ground temperature so that it does not fall below 0 ° C by determining the thickness of the foamed resin board with the lowest temperature in mind. Instead, water can be used.

  The heat medium is generally circulated in the pipe by a pumping device such as a pump. The distribution speed at this time can be appropriately determined in consideration of the installation environment, the diameter of the pipe, and the like at a speed at which the heat medium can sufficiently exchange heat with the geothermal heat in the geothermal exchanger. In general, when the heat medium is air, the pipe diameter is 1 to 20 m / sec at 10 to 100 mm, and when the heat medium is water, the pipe diameter is 0.1 to 0.1 at 7 to 50 mm. The flow rate can be set to about 2.0 m / sec.

  In the geothermal exchanger in the underground heat exchanger buried structure of the present invention, after heat exchange is performed between the heat medium circulating in the interior and the ground, the recovered geothermal heat is used for air conditioning, hot water supply, and the like. As a system for using geothermal heat, a conventionally known system may be appropriately used as a geothermal heat exchange system. For example, after exchanging heat with geothermal heat using the outside air as a heat medium as in the underground heat exchanger embedding structure 1 of the present invention shown in FIG. 1, the outside air is discharged directly or indirectly into the room and reaches a desired temperature. The outside air can be used as it is. Alternatively, as in the underground heat exchanger embedded structure 1 ′ of the present invention shown in FIG. 1, an air conditioner installed in the floor or in an underground pit with heat recovered by exchanging heat with geothermal heat using a liquid such as water as a heat medium. Further, heat exchange can be performed to blow warm air or cold air into the room. Similarly, a heat pump may be used instead of the air conditioner. Or although not shown in figure, the pipe | tube with which a thermal medium distribute | circulates can further be extended and it can also be piping in a building. The place to pipe is arbitrary, but for example, the ceiling, under the floor, inside a solid concrete slab, or a wall.

  The use of the above geothermal is to provide a branch header at the end of the discharge pipe side of one pipe constituting a horizontal geothermal exchanger, and branch destinations are piping, air conditioners, heat pumps, dehumidifiers in the building, respectively. It is also possible to connect to an arbitrarily combined device such as a cooler. According to this aspect, the operation can be switched according to conditions such as the room temperature and humidity, the outside air temperature and humidity, and the heat medium having undergone heat exchange can be sent to a desired location to increase the heat exchange rate. Further, the number of horizontal geothermal exchangers buried under a solid foundation may be one or two or more. When embedding a plurality of geothermal exchangers, the same apparatus is used. A plurality of them may be embedded, or devices having different systems may be combined and embedded.

[Other configurations]
Further, the solid base and the foamed resin board in the present invention can be further provided with other configurations without departing from the gist of the present invention. For example, in order to improve drainage around the solid foundation, the permeable board 21 may be installed at a position covering at least a part of the outer peripheral side surface of the solid foundation. The permeable board 21 is a foamed resin board in which a water-permeable gap is formed inside or a foamed resin board provided with a water-permeable groove on the outer side surface, and a member for promoting drainage of water in the ground. It is. In particular, it is desirable that the voids and grooves are covered with a nonwoven fabric or the like in order to prevent the gaps and grooves from being blocked by soil.
Moreover, although not shown in figure, you may install the connection body provided with the air layer for attenuating vibrations, such as an earthquake disclosed by patent 2980604, between a solid foundation and a foamed resin board.

When the foamed resin board is laid in contact with the bottom surface of the solid foundation (the geothermal exchanger embedded structure of the present invention shown in FIG. 4, hereinafter, also referred to as “the embedded structure of the present invention”), when not laid (the foamed resin board 3 is Except for the above, in the geothermal exchanger embedded structure similar to the geothermal exchanger embedded structure in FIG. 4 (hereinafter also referred to as “comparative embedded structure”), the temperature change of the ground in January and August, the geothermal exchange The following shows the results of simulations using the average temperature (data from the Japan Meteorological Agency) in 2007 in Hachioji City regarding the changes in the inlet temperature and outlet temperature of the heat medium in the vessel, and what values the amount of heat collection shows. . In Hachioji City, the average temperature in January 2007 was 4.8 ° C, and the average temperature in August was 27.8 ° C. The average annual temperature was 15.1 ° C. The difference (23.0 ° C.) between the average temperature in August and the average temperature in January is defined as a temperature yearly difference. The room temperature in January was set to 20 ° C, and the room temperature in August was set to 25 ° C.
The buried structure of the present invention is set such that the distance from the ground surface to the bottom surface of the solid foundation 2 is 500 mm, the thickness of the slab of the solid foundation 2 is 150 mm, the thickness of the foamed resin board 3 is 200 mm, and the underground pit is from the outside There was no ventilation. On the other hand, in the comparative buried structure, the distance from the ground surface to the bottom surface of the solid foundation was set to 500 mm, the thickness of the slab of the solid foundation was set to 150 mm, and the underground pit was made to be able to vent to the outside. The horizontal geothermal exchanger in the buried structure of the present invention and the comparative buried structure has a nominal diameter of 30 mm, a distance between the centers of the cross sections of adjacent pipes in parallel is 300 mm, and a length of 50 m when air is used as a heat medium. When it is set as a pipe made of crosslinked polyethylene and water is used as a heat medium, a resin pipe having a nominal diameter of 16 mm, a cross-sectional center distance between adjacent pipes in parallel of 150 mm, and a length of 100 m. It was set to be.

  First, the underground temperature in January and August in Hachioji City was calculated using the following equation 1 every 1 m from the ground surface to 1 m to 10 m. The results of this calculation are shown in Table 1. Equation 1 is quoted from "Air Conditioning Calculation Method by Personal Computer Mitsuhiro Udagawa" (Ohm).

However, each coefficient in the above equation 1 is as follows.
t: underground temperature (° C)
tg: Annual average temperature (underground temperature of 9 m or less (° C) that does not change yearly)
te: Annual temperature difference (℃)
n: Day of the week counted from New Year's Day h: Depth from the ground surface (m)
e: the base of natural number (2.771828)

Next, the temperature immediately below the foamed resin board in the above-described embedded structure of the present invention was calculated using the following formula 2. In the buried structure of the present invention, the underground pit is configured so as not to vent from the outside, and therefore the temperature of the underground pit is treated as the same as the room temperature. And the temperature just below a foamed resin board was computed from the following number 2 using the underground pit temperature and the underground temperature of 10 m underground in Hachioji City.

However, the coefficients in Equation 2 are as follows.
q: Calorie (kcal / m ² · hr)
t: Surface temperature (° C)
δ: layer thickness (m)
λ: thermal conductivity (kcal / m · hr · ° C)
Specifically, as δ, the thickness of the foundation concrete is 0.15 m, the thickness of the foamed resin board is 0.2 m, and the distance from the bottom surface of the foamed resin board (the bottom surface of the concrete surface in the embedded comparative structure) to 10 mm in the ground The thermal conductivity is 1.4 (kcal / m · hr · ° C) for concrete, 0.03 (kcal / m · hr · ° C) for foamed resin board, and 1.29 (kcal) for soil. / M · hr · ° C). In addition, Equation 2 is quoted from pages 14 and 15 of “Heat Transfer Engineering” (Morikita Publishing).

Then, the amount of heat immediately below the foamed resin board in a steady state is obtained from Equation 2 using the temperature of the underfloor space in the buried structure of the present invention and the estimated temperature of 10 m underground, and the amount of heat obtained is Substituting it into the formula of t _{n + 1} derived from 2 to obtain the temperature, the temperature just below the foamed resin board was obtained. Specific mathematical formulas are shown in the following formula 3 for the January simulation and in the following formula 4 for the August simulation.

  As shown in the above equations 3 and 4, the temperature immediately below the foamed resin board in the embedded structure of the present invention was 17.6 ° C. in January and 20.2 ° C. in August. Therefore, the difference between the temperature in August and January is set as the annual temperature difference, and the average temperature is set at 15.1 ° C. Using these values, the embedded structure of the present invention was implemented from Equation 1. The underground temperature in the ground was calculated every 1 m from January to August from 1 m to 10 m from the ground surface. Table 2 shows the calculation results. In addition, FIG. 5 shows a graph created by plotting the calculation results with the vertical axis representing temperature (° C.) and the horizontal axis representing underground depth (m).

  Next, the underground temperature under the comparative buried structure was simulated. First, the temperature of the underground pit of the comparative buried structure was set. Since the underground pit of the comparative buried structure is configured to be able to ventilate with the outside, the temperature of the underground pit is set to an average temperature of the outside air temperature and the room temperature. That is, the January temperature of the underground pit in the comparative buried composition was set to 12.4 ° C, and the August temperature was set to 26.4 ° C. As a result of calculating the temperature immediately below the slab, which is the solid foundation of the comparative buried structure, from the above equation 2 using the temperature of the underground pit and the underground temperature of 10 m underground in Hachioji City, January is 12. It was calculated as 46.2 ° C and 26.2 ° C in August. In addition, the concrete calculation of the temperature of the said January and August is shown in following Formula 5 and Formula 6.

And the difference between the temperature in August and January is the temperature of the yearly difference, and the average temperature is 15.1 ° C. Using these figures, the ground where the comparative burial structure was implemented from Equation 1 The underground temperature was calculated for January and August every 1 m from 1 m to 10 m from the ground surface. Table 3 shows the calculation results. Further, FIG. 6 shows a graph created by plotting the calculation results with the vertical axis representing temperature (° C.) and the horizontal axis representing underground depth (m).

  Next, from the above results, a simulation of underground heat collection in the embedded structure of the present invention and the comparative embedded structure is shown. Specifically, the temperature change of the heat medium in the inlet and the pipe of the geothermal exchanger is calculated using the following formula 7. In addition, the following number 7 was quoted from Sekisui Chemical Co., Ltd. “Eslon HT pipe design and construction manual” (2000.7 revision 9th page, page 13).

However, each coefficient in Formula 7 is as follows.
θ ₂ : Heat medium temperature at any point (outlet temperature) (° C.)
θ ₁ : Initial heat medium temperature (inlet temperature) (° C.)
θ _r : underground temperature (° C)
L: Distance to any point (pipe length) (m)
R: Heat transfer resistance value of pipe (m · hr · ° C / kcal)
Cp: Specific heat of fluid (heat medium) (kcal / kg · ° C)
W: Flow rate of fluid (heat medium) (kg / hr)
e: base of natural logarithm (2.771828)

Next, using the above Equation 7, when the heat medium is air, the outlet temperature θ ₂ in the geothermal exchanger when air is introduced into the geothermal exchanger was calculated. The geothermal exchanger is a cross-linked polyethylene pipe having a nominal diameter of 30 mm arranged in parallel in the horizontal direction at a distance of 30 cm between the centers of adjacent pipe cross sections, and has an installation area of about 15 m ² , an outer diameter of 42 mm, The inner diameter was 36.4 mm and the pipe length L was 50 m.
The inlet temperature θ _{1 of the} air flowing into the geothermal exchanger is the monthly average temperature of 27.8 ° C in August in the summer (August) calculation, and the monthly average temperature in January in the winter (January) calculation. .8 ° C., and the underground temperature θr is the underground temperature (1 m, 2 m, 5 m, 10 m) in the embedded structure of the present invention shown in Table 2 in the estimated calculation of the embedded structure of the present invention. Then, it was set as the underground temperature (underground depth 1m, 2m, 5m, 10m) in the comparative embedding structure shown in Table 3.
The heat transfer resistance value (R) of the pipes constituting the geothermal exchanger is 0.648 for 1 m underground, 0.727 for 2 m underground, 0.835 for 5 m underground, and 0.8 for 10 m underground. 919 (both units of R are (m · hr · ° C./kcal)).
The specific heat (Cp) of air is 0.240 (kcal / kg · ° C.), the flow rate (W) of air flowing in the geothermal exchanger is 27.98 kg / hr (400 L / min), and the flow rate is 6.41 m / s. Θ ₂ was calculated as follows. The results are shown in Table 4. The air flow rate (W) is defined as the flow rate of air flowing per unit time (400 L / min = 24 m ³ / hr) in the pipe and the specific weight of air (w = 1.166 kg / m ³ ). Obtained by product.

Subsequently, the product Q (kcal / K) of the difference Δt (° C.) between the inlet temperature and the outlet temperature shown in Table 4, the specific heat Cp (kcal / kg · ° C.) of the air and the flow rate W (kg / hr) described above. hr) was calculated and shown in Table 5 as the amount of heat collected by the geothermal exchanger.

Similarly, using the above Equation 7, when the heat medium is water, air was introduced into the geothermal exchanger, and the outlet temperature θ ₂ in the geothermal exchanger was estimated. The geothermal exchanger is a cross-linked polyethylene pipe having a nominal diameter of 16 mm arranged in parallel in a horizontal direction at a distance of 15 cm between the cross-sectional centers of adjacent pipes, and has a laying area of about 15 m ² , an outer diameter of 21.5 mm, and an inner diameter. The length L of the pipe was 17.5 mm and the length L was 100 m.
The inlet temperature (θ ₁ ) of water flowing into the geothermal exchanger is 25 ° C in the summer (August) trial, 10 ° C in the winter (January), and the underground temperature (θr) is In the trial calculation in the invention buried structure, the underground temperature (underground depth 1 m, 2 m, 5 m, 10 m) in the comparative buried structure shown in Table 2 was used. In the trial calculation in the comparative buried structure, the underground in the invention buried structure shown in Table 3 The temperature was set to a depth of 1 m, 2 m, 5 m, and 10 m.
The heat transfer resistance value (R) of the pipes constituting the geothermal exchanger is 0.762 for 1 m underground, 0.840 for 2 m underground, 0.949 for 5 m underground, and 1 for 10 m underground. 033 (both units of R are (m · hr · ° C./kcal)).
The specific heat (Cp) of water is 1.001 (kcal / kg · ° C.), the flow rate (W) of water flowing in the geothermal exchanger is 539.5 kg / hr (9.0 L / min), and the flow rate is 0.00. Θ ₂ was calculated as 62 m / s. The results are shown in Table 6. The water flow rate (W) is determined by the flow rate of water flowing per unit time in the pipe (9.0 L / min = 0.54 m ³ / hr) and the specific weight of air (w = 999.0 kg / m). ³ ) Calculated by product with

Subsequently, the product Q (kcal / K) of the difference Δt (° C.) between the inlet temperature and the outlet temperature shown in Table 6, the specific heat Cp (kcal / kg · ° C.) of the water and the flow rate W (kg / hr) described above. hr) was calculated and shown in Table 7 as the amount of heat collected by the geothermal exchanger.

From the above results, the ground temperature under the buried structure of the present invention is generally not greatly different even when comparing January and August when the annual difference is the maximum, and the ground temperature is stable throughout the year. The result that it is doing was shown. On the other hand, in the comparative buried structure, it was shown that the ground temperature in January and August had a remarkable difference from the ground surface to around 4 m.
In response to this ground temperature, the temperature change at the inlet temperature and the outlet temperature of the heat medium in the geothermal exchanger is also small in the buried structure of the present invention, whereas the comparative buried structure has a large yearly difference. It became. In other words, in the buried structure of the present invention, as shown in Table 5 or Table 7, it was shown that the amount of heat collected in the geothermal exchanger was significantly larger than the comparative buried structure. When water is used as a heat medium, the temperature difference between the buried structure of the present invention and the comparative buried structure is smaller than that when air is used as the heat medium, but water has a larger specific heat than air. When converted to, it is understood that the buried structure of the present invention clearly has a larger amount of heat.

It is a section schematic explanatory view showing an embodiment of a geothermal exchanger embedding structure of the present invention. 2A is an XX cross-sectional schematic view of the geothermal exchanger embedded structure of the present invention shown in FIG. 1, and FIG. 2B is an XX showing an embodiment in which a grout material is filled between the geothermal exchanger and the ground. FIG. It is a section schematic explanatory view showing an embodiment of a geothermal exchanger embedding structure of the present invention. It is a section schematic explanatory view showing an embodiment of a geothermal exchanger embedding structure of the present invention. It is a graph which shows the result of having simulated the underground temperature of January and August in the ground in which this invention embedding structure was implemented. It is a graph which shows the result of having simulated the underground temperature of January and August in the ground in which the comparative embedding structure was implemented.

Explanation of symbols

1, 1 'Geothermal exchanger embedded structure 1''Geothermal exchanger embedded auxiliary structure 2 Solid foundation 3 Foamed resin board 4A, 4B Horizontal geothermal exchanger 5 Reinforced concrete surface 6 Underground beam
7 Drainage layer 11 Outside air inlet 12 Outside air outlet 13 Pipe 14 Air conditioner 15 Pipe 16 Air outlet 21 Water permeable board 22 Concrete layer 23 Foamed resin board 25 Solid foundation auxiliary structure 31 Ground covering concrete 41 Geothermal exchanger embedded structure 42 Support Pile body 43 Concrete slab 101 Building 102 Exhaust fan 103 Ground 104 Grout material 105 Floor 106 Underground pit

Claims (6)

A solid foundation provided as the foundation structure of the building;
A foamed resin board laid in contact with the bottom surface of the solid foundation;
A horizontal underground heat exchanger embedded under the foamed resin board;
An underground heat exchanger embedded structure characterized by comprising: A pile foundation comprising a foundation slab and a pile body provided as a foundation structure of the building;
A foamed resin board laid in contact with the bottom surface of the foundation slab in the area excluding the pile body part,
A horizontal underground heat exchanger that is an area excluding the pile body part and is buried under the foamed resin board,
An underground heat exchanger embedded structure characterized by comprising: The horizontal underground heat exchanger is provided with a heat medium inlet and outlet at both ends, and the heat medium can be circulated inside the pipe. The pipe extends in a substantially horizontal direction with respect to the ground surface. The underground heat exchanger embedded structure according to claim 1 or 2, wherein the underground heat exchanger is embedded. The ground according to claim 1 or 2, wherein the horizontal underground heat exchanger is a pipe that extends in a substantially horizontal direction with respect to the ground surface and is capable of circulating a heat medium therein. Medium heat exchanger embedded structure. The underground heat exchanger embedded structure according to any one of claims 1 to 4, wherein a grout material is filled between the horizontal underground heat exchanger and the ground. The ground covering concrete provided continuously from the outer side surface of the solid foundation or the building constructed on the solid foundation is provided in at least a part of the circumference of the solid foundation or the building, and
The foamed resin board is further laid in contact with at least a part of the bottom surface of the ground covering concrete,
The underground heat exchanger embedding structure according to any one of claims 1 to 5, wherein the horizontal underground heat exchanger is also embedded below the ground covering concrete.

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