KR20130074610A - Depth geothermal system unit - Google Patents

Abstract

PURPOSE: A very deep ground coupled heat exchanging system is provided to compose a pipe with a specific gravity which is suitable for the depth of a geothermal hole by increasing the whole specific gravity through a combination between a polyethylene (PE) pipe and a steel pipe, thereby being stably installed in the very deep ground without floating due to buoyancy of underground water. CONSTITUTION: A very deep ground coupled heat exchanging system comprises a heat exchange water supply unit and a return water unit which are equipped with a U band header (10), a support steel pipe (20), a water supply bypass pipe (30), and a return water bypass pipe. The U band header comprises a water supply bypass connection unit and a return water bypass unit. The support steel pipe is connected to the water supply bypass connection unit and the return water bypass unit of the U band header respectively, and equipped with a water supply bypass joint unit and a return water bypass joint unit. The water supply bypass connection unit and the return water bypass unit are pipe-fitted to the water supply bypass joint unit and the return water bypass joint unit of the support steel pipe respectively. The water supply bypass connection unit and the return water bypass unit include a first polyethylene (PE) socket of a water supply bypass and a return water bypass, a PE pipe of the water supply bypass and the return water bypass, and a weight unit. The first PE socket of the water supply bypass and the return water bypass is pipe-fitted to the water supply bypass joint unit and to the return water bypass joint unit of the support steel pipe by being heated and compressed. The PE pipe of the water supply bypass and the return water bypass is thermally welded to the first PE socket. The weight unit is applied to the PE pipe of the water supply bypass and the return water bypass to be inserted into a geothermal hole without floating by buoyancy.

Description

High-depth underground heat exchanger system {DEPTH GEOTHERMAL SYSTEM UNIT}

The present invention relates to a high-depth underground heat exchange system, and more particularly to a high-depth underground heat exchange system that can be installed stably without a buoyancy of groundwater at high depth even using a PE pipe for recovering geothermal heat. It is about.

Geothermal heat refers to the natural heat and ground heat of groundwater pumped by excavating groundwater. Generally, the ground surface is excavated at a deep depth of about 100 meters or more and 500 meters or so, and there is a pipe for heat exchange, The groundwater pumping pump and the pumping water were installed in the same way as the groundwater treatment facility, and the groundwater was pumped, and the heat of the groundwater was heat-exchanged using the heat pump, and then the groundwater exchanged with the heat- And a heat exchange system for returning to the inside is used.

The groundwater temperature is maintained at 17 ° C to 18 ° C throughout the year without changing the ground temperature. When the groundwater having this temperature is pumped up and the heat is used by using the heat pump, the amount of water of the groundwater pump is reached to 1000 liters per hour. At 4 ℃, it is possible to obtain 4000 calories per hour of heat. The temperature of the groundwater that has been exchanged by the heat exchange is lowered into the groundwater drilling hole through the water return pipe, This cycle can continue to be usable as it keeps increasing again. The facility using this principle is a geothermal heat exchanger.

The underground heat exchanger is largely divided into an open underground heat exchanger device and a closed underground heat exchanger.

The open-type geothermal heat exchanger system has the same structure and facilities as the general groundwater system, and it takes the form that the groundwater is pumped and the geothermal energy of the groundwater is used instead of the water, and then the ground water is injected back into the groundwater As the groundwater is exposed at the ground level, there is a high possibility of contamination of groundwater. On the other hand, the closed underground heat exchanger device is installed by inserting two strands of geothermal coil pipes connected with U-bands to the bottom to perform underground heat exchange in the excavated geothermal rig. It is filled with grouting liquid and fixed. The closed underground heat exchanger device only functions to exchange heat retained by heat exchanged from the ground through the geothermal coil pipe to the ground without directly pumping and exposing the groundwater, so that the brine for heat exchange in the closed circulation pipe is always circulated. As it is circulated by but not in direct contact with the groundwater, the groundwater pollution may not be greatly concerned as compared to the open underground heat exchanger device. Therefore, it is a system that should be highly recommended in terms of groundwater environmental conservation.

In particular, due to the promotion of low-carbon green growth and the surge in petroleum prices, geothermal demand is likely to increase steadily in accordance with the expansion and supply policy of renewable energy. However, due to concerns about groundwater pollution due to geothermal system operation, This trend is gradually getting stronger. The concern about groundwater contamination by geothermal system is serious in the case of open-type geothermal heat exchanger system in which the heat-exchanged groundwater is in direct contact with the groundwater in the rock aquifer flowing directly into the excavation hole, There is a great need for an apparatus and a method that can be replaced with a heat exchanger apparatus. In addition, in the case of the open-type geothermal heat exchanger, since the groundwater pump is installed inside the geothermal drilling hole for pumping groundwater, when the natural water level is particularly low, the operation cost is excessively charged for pumping groundwater. There was also a lowering problem.

In addition, the groundwater returned to the inside of the geothermal excavation hole flows down from the geothermal excavation hole and sinks and erodes the excavated air wall, and the soil that flows along with the groundwater flowing from the fracture zone or the rock aquifer, And accumulation is made in the inside of the apparatus, so that there has been a management difficulty to periodically perform the surging operation using the compressed air.

In addition, when a plurality of geothermal excavators are operated together, the amount of groundwater to be returned to each geothermal excavator varies due to the difference in the circulating water quantity. As a result, some geothermal excavator balls seriously overflow the groundwater to the outside of the geothermal excavator Which causes problems in operation of the system. In addition, due to the nature of the water quality of the groundwater itself, it may contain soil and sand, and it contains many substances that can form a scale in piping or heat exchanger such as calcium and magnesium, so that heat exchange efficiency is lowered and clogging of circulating water pipe There is a problem that there is a high possibility of occurrence.

In the case of the closed underground heat exchanger device, the brine that circulates the heat exchanger and the circulating water pipe (in this case, brine uses clean fresh water added with antifreeze to prevent freezing in the winter, and inside the brine tube, the heat exchanger, and the geothermal excavator) Is a heat exchange medium that circulates inside the geothermal coil pipe installed on the ground. It has the advantage of achieving internal circulation. The geothermal system composed of such a closed underground heat exchanger device currently has a vertically sealed U-band vertical sealing type which is installed by inserting a U-band geothermal coiled pipe into a geothermal drilling rig. The double pipe tube type formed by inserting the internal circulation pipe inside and the energy pile type with geothermal coil pipe installed inside the foundation pile are being developed and operated as representative types.

On the other hand, the surface soil is excavated to a depth of about 2m, and then the geothermal coil pipe is laid horizontally, and the horizontally sealed type which constitutes the system is also included in the category of the closed underground heat exchanger device.

However, in case of the U-band geothermal coil pipe formed by connecting the U-band to the end of the two-layer geothermal coil pipe by heat fusion, the geothermal coil pipe is wound in a circular shape, The U-band part at the end of the geothermal coil pipe collides with the wall of the geothermal excavation hole or the entire geothermal coil pipe is bent in a circular shape. Even if the U-band part is deployed at the site, it is difficult to ensure the straightness, .

Low-cost polyethylene (PE) is mainly used for water supply and return pipes for pumping and returning groundwater. PE pipe has the advantages of low cost, but due to its low specific gravity and ductile properties, the high depth of geothermal hole depth of 300 ~ 500m causes buoyancy when inserting water supply and return pipe into geothermal hole. An impossible phenomenon occurs.

On the other hand, there is a method to reduce the buoyancy by filling the water inside the PE pipe to compensate for the shortcomings of the PE pipe, but it is difficult to insert the fundamental specific gravity difference is not achieved.

In addition, since the PE pipe has a ductile property, straightness is not secured when inserted into the geothermal hole, thereby causing warpage. Therefore, PE pipes are difficult to secure rigid straightness like steel pipes because of their inability to secure compulsory insertion force.

On the other hand, the header connecting the water supply pipe and the return pipe is applied by heat fusion of two elbows or is composed of one body through a mold, which causes a problem that the diameter of the PE pipe is increased and the minimum required geothermal hole diameter is excessively large. There is also.

In addition, the actual depth of insertion had a problem that was difficult to confirm until the supervising supervisor visited the site. In addition, when the grouting injected to hold the geothermal coil pipe inside the geothermal drilling hole and reduce the flow of empty space becomes poor, the surface of the geothermal coil pipe may be subjected to friction with the drilling hole wall due to the long-term pulsation generated when the circulation pump is operated. In case of damage, the leakage of circulating water caused high levels of groundwater contamination as well as serious damage to the geothermal system. In addition, as the depth of the facility is shallow, the heat transfer area of the geothermal heat exchanger installed in the individual geothermal excavator is not large, so that the efficiency of underground heat exchange is relatively lower than that of the open geothermal heat exchanger.

Therefore, compared to the geothermal drilling rigs of open-type geothermal heat exchangers, which are excavated and operated at the same total heat amount, a large amount of geothermal drilling holes are required in the case of the U-band vertical closed type. The area of the site was also required to be broader. Due to the problem of securing the site area, in case of U-band vertical closed type, a geothermal coil pipe can be installed inside the foundation file before the building is built, or a geothermal excavator can be drilled densely on the bottom part of the building, And the piping is connected to the total heat exchanger of the heat pump installed in the machine room after the underground heat exchanger is constructed. As a result, the U-band vertical hermetic geothermal facility, which has the advantage of convenient facility operation when the site area is narrow, has a problem in that it cannot install the facility capacity sufficiently.

In order to solve this problem, even though it is helpful to insert the geothermal coil pipe by using the steel pipe pipe, the outer circumferential surface of the steel pipe pipe and the geothermal coil pipe continuously rubs in the process of pulling the steel pipe pipe to the ground after the insertion is completed So that there is a high possibility that perforation due to abrasion may occur, so that it can not be utilized.

Therefore, it was necessary to develop a technology that can utilize a large amount of geothermal by excavating a small amount of geothermal excavation hole, for this purpose, the present applicant is registered Patent No. 10-0981527 (high depth vertically sealed underground heat exchanger device and construction method) The company has developed a technology that can drastically implement the insertion depth of geothermal coil pipes.

On the other hand, the same purpose may be achieved through the installation of a plurality of geothermal coil pipe inside a single geothermal excavation hole, but in this case, the U band is located at the bottom of the geothermal excavation hole while being located at the tip of the geothermal coil pipe To overlap with each other there is a problem that the diameter of the geothermal excavation hole must be required to insert it into the geothermal excavation hole.

As the geothermal coil tube increases in size due to the minimum radius of curvature required to form the U-band, the radius of curvature of the U-band forming becomes more proportionately, resulting in an excessively large geothermal excavation. In this case, the installation of two geothermal coil pipes in two or more lines when installed more than three lines, due to this problem was bound to be a practical application problem.

Republic of Korea Patent No. 10-1025018 Republic of Korea Patent No. 10-0981527 Republic of Korea Patent No. 10-0768064

The present invention is to solve the problems as described above, to provide a high-depth underground heat exchanger system that can be installed stably without a buoyancy of groundwater at high depth even using a PE pipe for recovering geothermal heat There is a purpose.

A high depth underground heat exchange system according to the present invention includes a heat pump; A heat exchanger connected to the heat pump by a pipe; Installed in the ground and connected to the heat exchanger and includes heat exchange water supply and return means for supplying the heat to the heat exchanger to circulate the heat exchange water therein, the heat exchange water supply and return means, the water supply pipe connection portion and the return side connection portion is provided U-band headers; A support steel pipe connected to each of the water pipe connection part and the water return side connection part of the U-band header, and provided with a water supply side joint part and a water return side joint part each having an open shape toward an upper portion thereof; A water supply side and a return side first PE socket connected to the water supply side joint part and the return side joint part of the supporting steel pipe by heating and pressing, respectively; A water supply side and a return side PE pipe thermally fused to the first PE socket; A second PE socket connected to the water supply side and the return side PE pipe by heat fusion; And a connecting steel pipe connected to the second PE socket by heating and pressing, wherein the connecting steel pipe is selectively interposed between the PE pipes so that the PE pipe is inserted into the geothermal hole without being floated by buoyancy. It features.

According to the high-depth underground heat exchange system according to the present invention, by combining the PE pipe and the steel pipe to increase the overall specific gravity to form a pipe of a suitable specific gravity according to the depth of the geothermal pores, stable even without high buoyancy due to the buoyancy of groundwater Since the installation is excellent, workability is excellent and construction cost can be reduced.

1 is a perspective view of a heat exchange water supply and return means applied to a high depth underground heat exchange system according to the present invention.
Figure 2 is a front view of a high depth underground heat exchange system according to the present invention.
3 is an enlarged cross-sectional view of a portion “A” of FIG. 2.
Figure 4 is a plan view of the weight applied to the high depth underground heat exchange system according to the present invention.
5 is an exemplary view of a weight cover applied to a high depth underground heat exchange system according to the present invention.
6 is an exemplary view of a weight plate applied to a high depth underground heat exchange system according to the present invention.

As shown in Figure 1 and 2, the high-depth underground heat exchange system according to the present invention, by inserting the heat exchange water supply and return means into the geothermal hole (1) formed in the ground and the ground heat through the heat exchange water supply and return means The recovered heat exchange water is circulated through the heat exchanger (3), and the heat exchanger (3) and the heat pump (2) are connected by pipes to supply geothermal heat to the heat pump (2). The U-band header 10 and U-band header which form a starting point of the water supply side pipe and the return side pipe, feed water back to the heat pump 2 with the heat-exchanged water recovered by the heat pump 2 and recovering the geothermal heat. (10) to the water supply side connection portion 21 and the water supply side connection portion 21 and the return side connection portion 22 is provided with a water supply side connection portion 21 and the return side connection portion 22 of the support steel pipe 20, respectively Water supply side pipe 30 (water supply side 1PE socket 31, water supply side PE pipe 32) Water side 2PE socket 33, water supply side connecting steel pipe 34, hereinafter abbreviated as "1PE socket, PE pipe, second PE socket, connecting steel pipe" and return side pipe 40 (return side 1PE socket (41), the return side PE pipe 42, the water supply side second PE socket 43, the return side connection steel pipe 44, hereinafter abbreviated as "first PE socket, PE pipe, second PE socket, connecting steel pipe". ], And the water supply side pipe 30 and the return side pipe 40 is composed of weight means installed to be smoothly inserted into the geothermal hole by weight.

And, additionally, the lower portion of the u-band header 10 is provided with a weight head 50 for inducing a smooth insertion by its own weight. First, the weight head 50 is detachably coupled to the lower portion of the U-band header 10 through fasteners (for example, bolts and nuts) so that a weight suitable for the depth of the geothermal hole may be selected and used. The channel 51 is provided to reduce the interference caused by the interference. The weight head 50 may be formed, for example, in a cylindrical shape, and the water channel 51 may be formed at a circumferential direction at a circumferential direction at a circumference of the weight head 50.

The present invention uses the PE pipe 32 and PE pipe 42 as well as using the support steel pipe 20 and the connection steel pipe (34,44) to solve the disadvantages of the PE pipe (32,42) to use even at high depths This is to be possible and easy, in the drawings it is shown that one connecting steel pipe (34, 44) and two PE pipe (32, 42) is used, but using PE pipe (32, 42), depending on the depth It is characterized in that to use the selection of the connection steel pipe (34,44).

The U-band header 10 has a structure in which the water supply side connection part 11 and the return side connection part 12 are formed and are disposed at the bottom of the geothermal hole, so that the geothermal hole is efficiently used by increasing the heat exchange distance between the heat exchange water and the geothermal heat. The water supply side connection part 11 and the return side connection part 12 may be manufactured through a mold to be formed, or may be formed through bending of a pipe.

U-band header 10 has a specific gravity greater than water and the weight is made of a material larger than the PE pipe (32, 42), so that it can be inserted without injury even at high depths.

The support steel pipe 20 has a structure in which the water supply side joint portion 21 and the water return side joint portion 22 are formed together, and the water supply side joint portion 21 and the water return side joint portion 22 are each the u-band header 10. Connected to the water supply side connection portion 11 and the return side connection portion 12, respectively, the water supply side joint portion 21 and the water return side joint portion 22 of the water supply side connection portion of the u-band header (10) based on the drawing ( 11) and is attached to the return side connecting portion 12, but is formed in a form that goes toward the top so that heat exchange is not made between the water supply side heat exchange water and the return side heat exchange water.

 Of course, when the diameter of the geothermal hole is large, it may be configured to widen the gap between the water supply side connection portion 11 and the return side connection portion 12 of the U-band header 10, rather than the shape that is going upward toward the top Do.

The support steel pipe 20 prevents injuries due to buoyancy when inserted into the geothermal holes 1 even though the PE pipes 32 and 42 are used through specific characteristics than the water.

For the application as a weight means, the water supply side pipe 30 and the return side pipe 40 are connected to the PE pipes 32 and 42 selectively with connecting steel pipes 34 and 44 having a weight depending on the depth. In the depth where the PE pipes 32 and 42 can be installed by the U-band header 10 and the supporting steel pipe 20, the connecting steel pipes 33 and 44 are not used.

That is, when the U-band header 10, the support steel pipe 20 and the PE pipes 32 and 42 cannot be matched with the specific gravity alone, the connecting steel pipes 34 and 44 are used when it is impossible to insert into the geothermal holes 1 or is not smooth. do.

As shown in the figure, PE pipes 32, 42-connecting steel pipes 34, 44 from the supporting steel pipe 20 are alternately used.

However, the support steel pipe 20 and the PE pipes 32 and 42, the PE pipes 32 and 42, and the connecting steel pipes 34 and 44 are different materials and are not easy to connect. The first and second PE sockets 31 and 41 and 33 and 43 may be used for repair. The first PE sockets 31 and 41 connect the supporting steel pipe 20 and the PE pipes 32 and 42, and the second PE sockets 33 and 43 connect the PE pipes 32 and 42 and the connecting steel pipe 34. (44) will be described as being connected.

3 is a view illustrating a connection between the support steel pipe 20, the first PE socket 31, and the PE pipe 32, and the inside of the water supply-side joint portion 21 of the support steel pipe 20 has a female screw-indented groove. 21a (cross-sectional area thinner than the thickness of the first PE socket 31) is formed. When heat (temperature higher than the melting point of PE) is applied to the first PE socket 31 in order to connect the first PE socket 31 to the female screw-type indentation groove 21a of the water supply-side joint portion 21, The PE socket 31 is melted and deformed to have flexibility. In this state, when the end portion of the first PE socket 31 is inserted into the female screw-in press-fit groove 21a, the first PE socket 31 is press-fitted in the female thread form. It is deformed into the shape of the groove 21a and press-fitted. When the first PE socket 31 is cooled, the first PE socket 31 is maintained in the press-fitted groove 21a of the female screw shape.

The first PE socket 31 and the PE pipe 32 connect the joints by heat fusion.

In this way, the second PE socket 33 and the connecting steel pipe 34 are connected in the same manner.

The return side pipe 40 is also connected in the same way as the water supply side pipe 30 as described above.

In the present invention, the interval holder 60 is applied so that the water supply side tube 30 and the return side tube 40 maintain a constant interval. The spacer 60 is selectively disposed between the PE pipes 32 and 42, between the first and second PE sockets 31 and 41 and 33 and 43, and between the connecting steel pipes 34 and 44. It is fixed in a way that suits each material.

And, the center holder 70 is applied so that the water supply and return device of the present invention is disposed in the center of the geothermal hole (1). The center holder 70 is selectively disposed between the PE pipes 32 and 42, between the first and second PE sockets 31 and 41 and 33 and 43, and between the connecting steel pipes 34 and 44. It is fixed in a way that suits each material.

 Meanwhile, another method of the weight means may be applied to the weight cover 80 (see FIG. 5) and the weight plate 90 (see FIG. 6) (the weight cover 80 and the weight plate 90 may be made of steel, etc.). As its own heavy weight).

The weight cover 80 may have a structure in which two semicircular pieces are coupled through fasteners. Although the weight cover 80 is illustrated as fixing the PE pipes 32 and 42 together, the weight cover 80 is not limited thereto, and the weight cover 80 may be configured to independently wrap the P3 pipes 32 and 42, respectively. An inner circumferential surface of the weight cover 80 may include a slip prevention part 81 such that the weight cover 80 does not slip on the PE pipes 32 and 42. Slip prevention portion 81 may be of an uneven type.

The weight plate 90 is interposed between the PE pipes 32 and 42 and may be fixed to the PE pipes 32 and 42 through the fixing band 91.

The weight cover 80 and the weight plate 90 has a feature that can serve as a function of the spacing holder 60 as well as a function of increasing the specific gravity of the PE pipes 32 and 42.

That is, the weight cover 80 is composed of a pipe retaining portion (83, 84) formed on both sides of the gap holding portion 82 and the gap holding portion 82, the weight plate 90 is a PE pipe (32, The weight main body 90a which is arrange | positioned along the direction of PE pipes 32 and 42 between 42, and the space | interval maintenance blade 90b formed in the left and right both sides of the weight main body 90a, respectively. Spacing blade (90b) is a fixed end 91 is connected while the free end is supported on the PE pipe (32, 42).

The action of the high depth underground heat exchange system according to the present invention is as follows.

Depth of the geothermal hole (1) and the amount of groundwater to determine the amount of use of the PE pipe (32, 42), connecting steel pipe (34, 44). It is based on the use of the U-band header 10, the supporting steel pipe 20, and one PE pipe 32, 42. If only the PE pipe 32, 42 is used, it is difficult to insert the PE pipe 32 by buoyancy. , 42) and connecting steel pipes (34, 44).

The connection method of the PE pipes 32 and 42 and the connecting steel pipes 34 and 44 is made through the first and second PE sockets 31 and 41 and 33 and 43 as described above.

As such, when the high-depth underground heat exchange system of the present invention is inserted into the geothermal hole 1 (which can be constructed with a housing such as a casing first), the u-band header 10, the supporting steel pipe 20, and the connecting steel pipe 34 (44) [Including the weight of the weight 50, if the weight 50 is applied] groundwater in the geothermal hole (1) by the self-weight even in high depths can be installed without injury due to buoyancy, and then geothermal hole ( 1) The construction is completed by grouting the interior (grouting is omitted in Figure 2).

After the installation of the high-depth underground heat exchange system according to the present invention is completed, the heat exchange water is circulated to operate the heat exchange system, and the heat exchange water recovers the geothermal heat while descending to the high depth of the ground through the return side pipe 40, and a U-band header ( At 10), the direction is reversed and ascends to the ground through the water supply pipe 30 to recover the geothermal heat and is then supplied to the heat pump system.

Although the water supply side connecting portion 11 and the water returning connecting portion 12 of the u-band header 10 are adjacent to each other, the water supply side pipe 30 and the return side pipe 40 are spaced apart from each other through the supporting steel pipe 20. Since the heat exchange is not performed between the water, it is possible to prevent the thermal efficiency decrease by heat exchange of the heat exchange water flowing through the water supply side pipe 30 and the return side pipe 40.

10: U-band header, 20: support steel pipe
30: water supply pipe,
31: water supply side first PE socket, 32: water supply side PE pipe
33: water supply side second PE socket, 34: water supply side connection steel pipe
40: return side pipe,
41: return side first PE socket, 42: return side PE pipe
33: return side second PE socket, 34: return side connection steel pipe
50: weight, 60: spacing
70: center holder, 80: weight cover
90: weight plate,

Claims (7)

A heat pump 2;
A heat exchanger 3 configured to be connected to the heat pump by piping;
Is installed in the ground and connected to the heat exchanger and includes heat exchange water supply and return means for supplying the heat to the heat exchanger to circulate the heat exchange water therein,
The heat exchange water supply and return means
A U-band header 10 having a water supply side connection portion 11 and a water return side connection portion 12;
A support steel pipe 20 connected to each of the water supply side connection part and the water return side connection part of the U-band header and provided with a water supply side joint part 21 and a water return side joint part 22, respectively;
It includes a water supply side pipe 30 and a water return side pipe 40 which is piped to each of the water supply side joint portion and the return side joint portion of the support steel pipe,
The water supply side pipe and the water return side pipe are the water supply side and the water return side first PE sockets 31 and 32 and the first PE pipe which are piped by heating and pressing the water supply side joint part and the return side joint part of the supporting steel pipe, respectively. The water supply side and the return side PE pipe, including weight means applied to the water supply side and the return side PE pipes 32 and 42 and the water supply side and the return side PE pipe, respectively, heat-sealed to the socket, do not float by the buoyancy force. Underground heat exchange system for high depth, characterized in that to be inserted into the geothermal hole. The method according to claim 1, wherein the support steel pipe is formed with a female screw-shaped indentation groove 21a, the PE socket is deformed by the heat of the end is connected by being pressed into the female screw-shaped indentation groove of the support steel pipe Theft underground heat exchange system. The method according to claim 1 or 2, wherein the weight means is a pipe joint by heating and crimping the second PE socket (33,43), the second PE socket is piped by heat fusion to the water supply side and the return side PE pipe, respectively It comprises a water supply side and the return side connection steel pipes (34,44), wherein the connection steel pipe is a high depth underground heat exchange system, characterized in that the connection between the water supply side and the return side PE pipe selectively. According to claim 1 or claim 2, The weight means is formed in a plate or tubular weight cover 80 surrounding the water supply side and the return side PE pipe or a fixed band while being interposed between the water supply side and the return side PE pipe ( Open ground underground heat exchange system is installed in the bottom of the geothermal hole, characterized in that to increase the specific gravity, including the weight plate 90 is fixed through the (91). The said weight cover is a space | interval holding part 82 which is interposed between the said water supply side and a return-side PE pipe, and maintains the space | interval between the said water supply side and a return-side PE pipe, Both sides of the said gap holding part Open underground underground heat exchanger system is formed in each of the water supply pipe and the return side PE pipe coupled to each other consisting of a pipe coupling portion (83,84) is installed on the bottom of the geothermal hole. The weight plate according to claim 4, wherein the weight plate is formed on both sides of the weight body 90a and the weight body, respectively, and is supported at the periphery of the water supply side and the return side PE pipe. Open space underground heat exchanger system is installed in the bottom of the geothermal hole, characterized in that consisting of a space maintaining blade (90b) is fixed to the fixing band to maintain the interval of the. The method according to claim 1 or 2, comprising a weight head 50 that is detachably connected to the lower end of the U-band header, the weight head is to include a waterway 51 for inducing the flow of groundwater at the periphery A high depth underground heat exchange system.

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