JP2010281494A - Recovery utilization system of geothermal heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new, convenient, and low-cost geothermal heat recovery utilization system excellent in the efficiency and rationality of utilizing heat by considerably mitigating burdens such as the cost of construction and equipment and an effort for the construction. <P>SOLUTION: The geothermal heat recovery utilization system is characterized in that: an area to 6m of an underground depth is set to be an effective heat collecting area; and a heat collecting tube is buried in the ground by being inserted into a dug underground opening and by filling the opening with dug soil; a heat collecting tube unit is connected and buried in the ground in a U-shaped manner to arrange the heat collecting tube; a liquid medium circulates in the heat collecting tube; and the geothermal heat is recovered for utilizing the geothermal heat. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a novel system for recovering geothermal heat and utilizing it for air conditioning and the like, and a structure of a basement or the like that employs this system.

  In recent years, the use of natural energy has become a major social theme as a countermeasure against global warming, and the use of geothermal heat is one of such measures for using natural energy. However, when using this geothermal heat, it is necessary to embed a geothermal heat collection facility underground, and the high burial cost for that has become a major bottleneck, which has hindered its spread in Japan.

  The precedent for the use of geothermal heat has been to embed a long heat collection tube of about 100 m in the ground. The reason for using a heat collecting tube as long as 100 m in this way can be seen from the fact that the use of geothermal heat has become widespread for heating in cold regions such as Northern Europe. In these cold regions, there was a situation that the part near the surface was frozen in the extreme cold season, and heat could not be taken from the vicinity of the surface. And this kind of use of geothermal heat in cold regions such as Scandinavia is a precedent, and there is a history that it is desirable to embed a heat collecting pipe deeply in the ground for the use of geothermal heat.

  In the case of this 100 m heat collecting tube, a steel pipe is buried deeply and vertically in the ground as a sheath tube, a long special resin pipe is inserted into the inside, and a heat medium is circulated to collect heat. For this reason, there is a problem that the cost of the construction for the burial and the equipment is large and the construction itself is not easy.

  On the other hand, the idea based on the precedent of using geothermal heat in such a cold region is also proposed. For example, a steel pipe is driven into the ground in the vicinity of a ground building, a heat medium such as air or antifreeze is circulated in the steel pipe, heat is exchanged, and the ground heat transmitted to the steel pipe is collected by the heat medium, and the air in the building It has been proposed to use it for air conditioning by exchanging heat with it (Patent Documents 1-3).

  However, these are all heat collection using a steel pipe, and the installation work into the deep underground is not always simple, and causes problems such as vibration and noise. Moreover, the heat collection by such steel pipe implantation is inevitably deep due to the a priori nature that the deeper underground is more effective in terms of the use of underground heat, and the construction cost and labor burden are large. In other words, in the past, it was easy to be affected by the outside air temperature on the ground surface and shallow in the ground, so it is desirable to bury the heat collection pipe deep in the ground and at a stable temperature range throughout the year, and bury it deeper. For this reason, it has been considered essential to drive a strong steel pipe. In order to use as much geothermal heat as possible, it has been necessary to increase the number of steel pipes that are driven into the ground. For this reason, it can be said that the large burden of the construction of the heat collection pipe has made it difficult to spread the practical use of geothermal heat.

JP 2004-177013 A JP 2006-10098 A JP 2006-207919 A

  The present invention eliminates the conventional problems from the background as described above, greatly reduces the cost of construction and equipment, and the labor on construction, etc., easily and at low cost, and uses heat. The objective is to provide a new geothermal heat recovery and utilization system that excels in efficiency and rationality.

  The present inventor has been studying the use of geothermal heat in line with the actual situation in Japan, based on precedents in the cold regions of Northern Europe. In the process, in the Tokyo metropolitan area where the population is concentrated, the surface temperature heated in the summer is not much lower in the winter, but rather it is closer to the ground surface. In the case of heating and cooling by heat, the heat collection pipes can be short, and we have obtained extremely important knowledge that a practical average effective heat collection area may be 6 m from the surface. In addition, it has also been confirmed that this heat collection is not limited to a conventional steel pipe from the viewpoint of thermal efficiency, underground strength, and the like, and a normal, commercially available resin pipe may be used.

  Based on such knowledge that has not been known so far, the geothermal heat recovery and utilization system of the present invention is characterized by the following.

  First: An effective heat collection area up to a depth of 6 m in the ground, and a ground heat recovery and utilization system using a heat collection pipe buried underground by insertion into the excavated underground opening and backfilling of excavated residual soil, The heat collection tube unit is connected and buried in a U-shape so that the heat collection tube is arranged, and a liquid medium is circulated through the heat collection tube to recover the ground heat, thereby using the underground heat. Is possible.

  Second: The heat collecting tube unit is made of resin, metal, or a composite thereof, and has a straight tube shape, a curved tube shape, or a bellows shape.

  Third: By inserting the earth drill into the underground opening and backfilling the excavated residual soil when the steel material is driven, the heat-collecting pipe is buried and arranged close to the steel material.

  Fourth: Driving steel for building the basement.

  5th: The heat collecting pipe unit is connected by an elbow.

  6th: The flow shape adjusting part which makes the flow of a liquid medium turbulent is provided in the heat collecting pipe.

  Seventh: A water sprinkling section for spraying water for increasing the ground heat conductivity is disposed in or around the underground buried area of the heat collecting pipe.

  Eighth: The heat collection pipe is connected to the circulation pipe system to the building, and the liquid medium is supplied and used.

  Ninth: Floor radiant cooling and heating are performed by a circulation pipe system arranged under the floor of a house.

  Tenth: The heat collection tube is connected to a heat pump, and temperature adjustment for supplying and using the liquid medium is performed by the heat pump.

  Eleventh: The heat collection tube is connected to a heat storage tank for the liquid medium, and temperature adjustment for supplying and using the liquid medium from the heat storage tank is performed by a mixing valve.

  Twelfth: The heat collection tube is connected to a heat pump together with a liquid medium heat storage tank, and the temperature of the liquid medium from at least one of the heat collection pipe and the heat storage tank is adjusted for supply and use by the heat pump.

  Thirteenth: The liquid medium heat storage tank is integrally arranged as a part of the underground structure accompanying the construction of the basement.

  14th: The heat collection pipe is arranged around or in the vicinity of the outer wall accompanying the construction of the basement.

  The present invention also provides a structure, particularly a basement structure, that employs the geothermal heat recovery and utilization system having the above characteristics.

According to the underground heat recovery and utilization system of the first aspect of the present invention, unlike the conventional heat collection pipe system in steel pipe embedment by driving into the deep underground, the heat collection pipe is:
1) The effective heat collection area is up to 6m underground depth.
2) By inserting into a hole opened by simple excavation with an earth drill or the like and embedding it by refilling the excavation residue, the cost of construction and equipment is greatly reduced compared to conventional methods. However, it is easy to construct, and can be attached to various structures such as houses, underground structures, basements, etc., or widely used as an independent heat collection station.

  Further, according to the second invention, since the underground depth is much shallower than that of the conventional one, the resin heat collecting tube unit is sufficient in strength, and even if it is made of metal, the construction thereof is low cost. It becomes easy.

  And according to 3rd invention, a heat-collection pipe | tube will be arrange | positioned underground as simple and easy construction, snuggling up to the steel material driven into the ground for various purposes and uses. More specifically, as in the fourth aspect of the present invention, this steel material can be driven in a simple and easy manner for construction of a basement and with good convenience in using geothermal heat.

  In 5th invention, the improvement of workability | operativity and the distribution | circulation precision of a heat-transfer liquid medium is achieved by using an elbow for the connection of a heat collecting pipe unit.

  According to the sixth aspect of the present invention in which the flow shape adjusting portion for forming the turbulent flow in the heat collecting tube is provided, the heat transfer efficiency of the liquid medium is further improved.

  In 7th invention, a raise of underground heat-transfer property is achieved by watering more.

  In the eighth to twelfth inventions, the use of geothermal heat for various purposes and applications such as cooling and heating of houses, etc., by connecting a circulation pipe system, a heat pump, and a heat storage tank of a liquid medium and a heat collecting pipe. Will be more efficient and effective.

  In the thirteenth invention, the construction and convenience are improved by integrating the basement construction and the heat storage tank.

  And according to 14th invention, the new expansion | deployment of the basement structure including the structure of what is called a steel basement which the present applicant has developed is achieved.

It is the schematic which showed the relationship between the temperature by season and underground temperature. It is the general | schematic perspective view illustrated about arrangement | positioning accompanying driving of the H-shaped steel of a heat collecting tube. It is a schematic block diagram of the collection | recovery utilization system by a heat collecting tube. It is a general | schematic sectional drawing which illustrated arrangement | positioning of the heat collection pipe | tube accompanying the basement construction, and utilization as a housing air conditioning system. FIG. 5 is a schematic configuration diagram of the system of FIG. 4.

<Effective heat collection area of depth 6m>
In the present invention, the depth of the effective heat collection area for underground heat is set to 6 m. The reason will be described first.

  (1) Even when using geothermal heat, it is necessary to collect heat from a portion advantageous for heating and hot water supply.

  Until now, it has been assumed that heat collection using geothermal heat is performed from a stable part of the year. The part where the annual temperature change is 0.1 ° C. or less at a depth of 10 m or less in the ground is called a non-prone layer, and the heat collecting tube is normally buried 100 m deep in the non-prone layer.

The temperature of the incompetent layer is based on the formula proposed by Tomohiro Hirota (“Fundamental weather and climate survey basics” by Noriyuki Ushiyama)
Ts = 0.97Ts + 0.23 (Ts: non-prone layer temperature Ta: annual average temperature)
Underground temperature can be calculated from the annual average temperature of the area. (Error from actual measurement is within 0.1 ° C)
A temperature slightly lower than the annual average temperature is the temperature of the underground layer.

  In the area shallower than 10 m from the surface of the earth, the temperature changes regularly every year under the influence of solar heat.

  From the American scholar William Jerry and Robert Horton's proposal ("Soil Physics" published by Tsukiji Shoten), the annual change in the underground temperature is a sine curve that lags with the average temperature in the horizontal axis, depending on the depth. Can be explained. However, in order to know the actual situation, the geothermal heat used for cooling and heating was examined from the actual temperature change curve from the actual measurement data.

  (2) Since the period for heating and cooling is almost fixed in the house, the underground temperature during that period was examined.

  ■ Heating is operated from November 2 to April 29 (172) assuming an average temperature of 15 ° C or lower.

  ■ Air conditioning will be operated from June 22 to September 19 (90th) assuming a daily maximum temperature of 26 ° C or higher.

  The geothermal temperature in Japan's weather data has not been published since 1982. We examined the underground temperature at the time of air conditioning from three available materials. The temperature at a depth of 3 m was determined.

<a> Tokyo Region (“Passive Architectural Design Method for Natural Energy Use” Shokokusha)
Underground temperature during heating The temperature of the underground 3m on November 2 was 18.6 ° C, and on April 29 it was also 13.2 ° C, averaging 15.9 ° C
Tokyo area annual average temperature is 14.4 degrees Celsius, underground temperature is 14.2 degrees Celsius from the above formula
The average temperature during the heating period in the 3m section of the ground is 1.7 ° C higher than the non-prone section.

<B> Mito City (1982 Agricultural Meteorological Data)
Underground temperature during heating The temperature of 3m underground on November 2 was 17.4 ° C, and on April 29 it was 13.3 ° C, averaging 15.4 ° C.
The average annual temperature in the Mito region is 13.4 ° C. From the above formula, the annual underground temperature is 13.2 ° C.
The average temperature during the heating period in the 3m underground part is 2.2 ° C higher than the non-prone layer part.

<C> Kashihara City (Thirty Years of Temperature Fluctuation and Conservation Science No. 44 in Takamatsuzuka Tumulus)
Ministry of Agriculture, Forestry and Fisheries / Japan Meteorological Agency: Agricultural Meteorological Data No. 3 Data on Underground Temperature (1972)
Central Meteorological Observatory: Annual Climate Table (Japan and Far East) (1954)
Underground temperature during heating The temperature of the underground 3m on November 2 is 18.8 ° C, and on April 29, it is also 12.8 ° C, with an average of 15.8 ° C.
The average annual temperature in Kashihara City is 14.4 ° C. From the above formula, the annual underground temperature is 14.2 ° C.
The average temperature during the heating period in the 3m underground section is 1.6 ° C higher than the non-prone section.

  (3) On the other hand, when it sees about the ground surface shallower than 3 m, it is easy to be influenced by the ground temperature, and the underground temperature tends to be lower than the 3 m portion during the heating period.

  Moreover, when it sees about a place deeper than 3 m, it tends to be close to the non-prone layer temperature, and the underground temperature tends to be lower than the 3 m portion.

  For this reason, it is considered that the use of geothermal heat has a depth of 3 m as a central area and a multiple of up to 6 m as an effective area for geothermal heat recovery.

  This can be said from the viewpoint of heating and cooling as follows.

1) Heating operation As shown in FIG. 1, the temperature reaches a peak at a point of about 3 months from the peak of the outdoor temperature in summer in the 3m basement. Since the time when the heating operation starts is just this time, the underground heat is used when the underground is warmest. The underground temperature in the middle of the heating operation period tends to be higher by 1.6 to 2.0 ° C. than the annually unchanged temperature of the underground easy layer. In heating operation, a short 6-meter heat collection tube is more advantageous than a long heat collection tube that is placed below the non-prone layer.

2) Air-cooling operation The underground temperature is the lowest at 3m underground, about four months after the winter temperature is lowest. Since the cooling operation starts at the time when about two months have passed since then, the cooling operation is performed when the underground is warmed by about 2 ° C. The temperature of the underground 3 m in the middle of the cooling operation period tends to be about 2.5 ° C. higher than the temperature of the non-prone layer. From the comparison of the underground temperature, the 6m heat collecting tube is more disadvantageous for the cooling operation than the long heat collecting tube put below the uneasy layer.

  However, it should be considered that the energy ratio used for heating and cooling in the home is 20: 1, the period ratio of heating and cooling is about 2: 1, and that geothermal heat is also used for hot water supply.

  The geothermal temperature used for heating in the Tokyo area is 15.9 ° C on average, and warm water made for use in floor heating is about 40 ° C, so the temperature difference is about 24 ° C. The average of the geothermal temperature used at the time of cooling is 16.7 ° C. The cold water produced is about 22 ° C. and the temperature difference is about 5 ° C. Therefore, the work of the heat pump at the time of cooling is very small. When comparing geothermal heat collection with heating and cooling, the heat collection method should be decided with priority given to the heat collection of heating.

As mentioned above, it has been said that it is common sense that the heat collection tube is placed from 10m to 100m underground considering the uneasy layer, but using a short 6m length for the heat collection tube is only the amount of heat collected. Rather, the use of underground heat in the house is rather advantageous in view of the ease and cost of driving, and it should contribute to energy saving in the thermal environment of the house by using a 6m heat collecting tube as a familiar technology in the future. .
<Heat collection tube and its burial>
In the ground heat recovery and utilization system of the present invention, the heat collection tube may be made of resin, metal such as steel, or a composite of these. The shape may be a straight tube, a curved tube, or a bellows shape.

  For example, a heat collecting pipe unit such as a polyethylene pipe made of resin as a general product can be connected and buried in the ground so as to be U-shaped in a direction directly below the depth.

  FIG. 2 exemplifies the burying of the heat collecting tube as a case where the mountain-mounted H-shaped steel 3 is used as a steel material driven into the ground. The heat collecting pipe unit 1 has a straight pipe shape in this example, and is connected to the lower end portion of the heat collecting pipe unit 1 via a resin elbow 2 so as to be buried in a U shape. Regarding the heat collecting tube unit 1 constituting the heat collecting tube 10, from the viewpoint of carrying in to the construction site, embedding construction, etc., it is preferably considered to be a straight tube shape that can be obtained and constructed at a lower cost. It is not limited to this, and may be formed in a U shape in advance.

  In the example of FIG. 2, the resin-made heat collecting pipe 10 is inserted into the ground drill underground opening 4 with the driving of the mountain retaining H-shaped steel 3, and then the excavated residual soil is backfilled. The heat collection tube 10 is buried in the ground so as to be close to the mountain-mounted H-shaped steel 3. Its construction is simple. The presence of the mountain retaining H-shaped steel 3 not only facilitates the construction, but also strengthens the underground strength of the heat collecting tube 10.

  In the geothermal heat recovery and utilization system of the present invention, as shown in the example of FIG. 3, it may be arranged in combination with the driving of the steel material. However, when the effective heat collection area is as described above, the depth is 6 m. Further, the steel material or the like from the viewpoint of reinforcement is not essential, and the heat collecting pipe 10 may be buried alone in the ground. The strength of a general resin member used for the heat collecting tube unit 1 and the elbow 2 can withstand a depth of 6 m in depth, and an underground depth of less than about 10 m in construction. In such a case as well, embedding can be performed as a simple construction of inserting the heat collecting pipe 10 into the excavated underground opening and backfilling the excavated residual soil.

  As shown in FIG. 3, the U-shaped heat collecting tube 10 can be formed by connecting a required number of U-shaped units. The upper end portion of the heat collecting tube unit 1 may be connected to each other via an elbow 2B different from the elbow 2A at the lower end portion, or via a resin pipe.

  Here, about the embedment depth H from the ground surface of the heat collection tube shown in FIG. 3, as described above, the effective heat collection area is set to a depth of 6 m. The However, from the viewpoint of moisture content and soil quality that influence underground heat conduction, underground conditions at the construction site, overall scale of the system of the present invention, etc., it may be deepened to less than 10 m or shortened to about 4 m. Considered accordingly.

  Regarding the overall length of the heat collection tube 10 to which a plurality of U-shaped units are connected, the width W1 of the heat collection tube constituting the U-shape shown in FIG. 3, and the adjacent width W2 of the U-shaped unit, In consideration of the type and flow rate of the liquid medium to be circulated, and the efficiency of heat diffusion and recovery in the ground, the amount of heat required for the purpose and scale of the recovered underground heat It is designed and constructed from efficiency.

  When the elbows 2, 2A and 2B shown in FIGS. 2 and 3 are connected to the heat collecting tube unit 1 made of resin, welding by normal bonding or electric heating, or a fastener for connection Various known means such as these can be used. The same applies to the connection of the heat collecting tube units 1. In the case of electrowelding, on-site processing is possible, and it is considered convenient because it is simple and has good adhesion.

  From the viewpoint of improving heat conduction, a flow shape adjusting unit such as a baffle plate portion, a spiral portion, or a blade portion for making the flow of the liquid medium turbulent in an appropriate place in the flow path of the heat collecting tube 10 It is also considered to be effective.

  In addition, regarding the ground heat recovery and utilization system of the present invention, it is also noted that it is effective to sprinkle the soil around the arrangement of the heat collecting pipe 10 in an effective heat collecting area up to a depth of 6 m. Is done. Use of rainwater as watering may be considered, and an appropriate watering part may be installed.

  This is because the thermal conductivity of the soil changes depending on the moisture content. The volumetric water content in normal soil is about 16%, which is raised to about 25% by watering. Then, as the moisture content increases, the thermal conductivity can be improved by about 20%. This will greatly improve the recovery efficiency of geothermal heat.

  The geothermal heat utilization system as described above can be used for various purposes such as air conditioning, hot water supply, cold water, etc. As shown in FIG. 3, for example, the inside of the heat collecting pipe 10 is used as a heat transfer medium. While circulating the liquid medium 5 such as water or antifreeze, the ground heat can be externally utilized 7 through the liquid medium 5 for cooling and heating, hot water supply or the like by the pump 6. The liquid medium 5 can be stored in the tank 8 and combined with the circulation. In the tank 8, a replacement system for newly supplying and discharging the liquid medium from the outside is also appropriately adopted. The liquid medium may be various types such as water and antifreeze liquid, and adjusted water mixed with a component that prevents the scale from adhering to the inside of the tube.

  Of course, the type of the liquid medium may be different from the one for circulating the heat collecting pipe and the one for circulating use by heat exchange accompanying the use of a pump or a tank.

The pump 6 may have a heat pump function for adjusting the liquid temperature of the liquid medium from which the underground heat has been recovered in accordance with the purpose and use of the liquid medium. Further, the pump 6 may be provided with a mixing valve as a function thereof or as a separate body so that it can be adjusted to a required external use temperature by mixing the circulating liquid medium 5 and the liquid medium from the tank 8. Good. The tank 8 can have a function as a heat storage tank.
<Example of collection and utilization system>
The geothermal heat recovery and use system of the present invention may be arranged as a central station for its recovery and use and may be widely used for public use, or may be arranged for individual houses, factories, offices, etc. Good. As an energy saving system attached to a building such as a house, it is also considered to combine it with the basement construction. The construction of this basement can be used in combination with concrete RC construction, but the combination with the so-called steel basement structure, which has been developed by the applicant and has many construction results, is positive. Be considered. This basement structure employs a steel frame structure frame with steel retaining on the outer surface, and a steel frame with a steel plate on the outer surface, which is far more waterproof and moisture-proof than conventional RC basements. In addition, the main feature is that the workability is improved.

  In this steel basement, it may be arranged as shown in FIG. 1, for example, according to the arrangement of the H-shaped steel driven for the earth retaining, or arranged along the steel frame of the steel panel. You may be made to do.

  For example, FIGS. 4 and 5 show a steel basement structure in which a U-shaped heat collecting tube 10 is arranged in accordance with the implantation of the H-shaped steel 3 of the earth retaining, and a system in which underground heat is used for radiant cooling and heating on a residential floor. An example is shown.

  The underground heat recovered in the liquid medium 5 from the heat collecting pipe 10 is set to a predetermined temperature by the heat pump 60 and is connected to the heat storage tank 80, and the radiant cooling and heating on the floor 70 is performed through the circulation pump 6 and the circulation pipe 11. Realize. Here, the heat storage tank 80 is integrated as a part of the basement structure, so that the construction is also simple and easy.

  The geothermal heat may be used directly for cooling and heating by circulation of the liquid medium, but once the geothermal heat is recovered as a liquid medium, the cold / warm water is stored in an underground heat storage tank (water tank) and can be circulated. Good. In the latter case, it is possible to heat or cool the cold / hot water stored in the middle of the night by using late-night power to further reduce the electricity cost. According to the trial calculation, it is possible to reduce the electricity bill by 30% or more in total.

DESCRIPTION OF SYMBOLS 1 Heat collection pipe unit 2 Elbow 2A Lower end elbow 2B Upper end elbow 3 H type steel 4 Earth drill underground opening 5 Liquid medium 6 Pump 7 External use 8 Tank 9 External exchange system 10 Heat collection pipe 11 Circulation pipe 60 Heat pump 70 Floor 80 Thermal storage tank

Claims (15)

  An effective heat collection area with a depth of up to 6m in the ground, and a heat collection pipe unit that collects ground heat by using a heat collection pipe that is buried underground by insertion into the excavated underground opening and backfilling of excavated soil. Are connected and embedded in the U shape in the ground, the heat collecting pipe is arranged, and the liquid medium is circulated in the heat collecting pipe so that the ground heat can be recovered and the use of the ground heat can be performed. A system for recovering and using geothermal heat.   2. The ground heat recovery and utilization system according to claim 1, wherein the heat collection tube unit is made of resin, metal, or a composite thereof, and has a straight tube shape, a curved tube shape, or a bellows shape.   The ground heat pipe according to claim 1, wherein the heat collecting pipe is buried in the ground and placed close to the steel material by insertion into the ground drill underground opening and backfilling of the excavated residual soil when the steel material is driven. Collection and utilization system.   The system for recovering and using geothermal heat according to claim 3, wherein the steel material is driven for construction of a basement.   The heat collection pipe unit according to any one of claims 1 to 4, wherein the heat collection pipe units are connected by an elbow.   The geothermal heat recovery and utilization system according to any one of claims 1 to 5, wherein a flow shape adjusting unit for turbulent flow of the liquid medium is provided in the heat collecting tube.   The underground water according to any one of claims 1 to 6, wherein a water sprinkling part for spraying water for increasing underground heat conductivity is arranged in or around the underground buried area of the heat collecting pipe. Heat recovery and utilization system.   The heat collection pipe is connected to a circulation pipe system to a building, and the supply and use of a liquid medium is performed. The ground heat recovery and use system according to any one of claims 1 to 7,   The ground heat recovery and utilization system according to claim 8, wherein floor radiant cooling and heating are performed by a circulation pipe system disposed under a floor of a house.   The ground heat recovery and use system according to any one of claims 1 to 9, wherein the heat collection pipe is connected to a heat pump, and temperature adjustment for supply and use of the liquid medium is performed by the heat pump.   The underground pipe according to any one of claims 1 to 10, wherein the heat collection pipe is connected to a heat storage tank for the liquid medium, and temperature adjustment for supplying and using the liquid medium from the heat storage tank is performed by a mixing valve. Heat recovery and utilization system.   12. The heat collecting tube is connected to a heat pump together with a liquid medium heat storage tank, and the temperature of the liquid medium from at least one of the heat collecting tube and the heat storage tank is adjusted for supply and use by the heat pump. The geothermal heat recovery and use system as described in any of the above.   The geothermal heat recovery and utilization system according to claim 11 or 12, wherein the liquid medium heat storage tank is integrally arranged as part of an underground structure associated with the construction of the basement.   The heat collection pipe according to any one of claims 1 to 13, wherein the heat collection pipe is disposed around or in the vicinity of the outer wall associated with the basement construction.   A basement structure in which the system according to any one of claims 1 to 14 is adopted.

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