JP2014163554A - Construction method of heat exchange equipment of geothermal heat utilization system and geothermal heat utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal heat utilization system which is excellent in constructive performance and has preferable efficiency.SOLUTION: A geothermal heat utilization system (10) is configured by embedding a U-shaped pipe 12 underground as a heat exchange device. Therein, the U-shaped pipe 12 includes a curved joint 32 and two straight pipes 34, 36. Upon the construction of the U-shaped pipe 12, a curved joint 32 of one U-shaped pipe 12 is stacked on a curved joint 32 of the other U-shaped pipe 12 so as to leave a predetermined interval and such that respective curved directions cross orthogonally to be unitized and the unitized portion is arranged into a pit 104.

Description

  TECHNICAL FIELD The present invention relates to a method for constructing a heat exchange device for a geothermal heat utilization system and a geothermal heat utilization system, and in particular, for example, exchanging heat between a fluid circulated inside a heat exchange device and ground heat to generate a ground. The present invention relates to a construction method for a heat exchange device of a geothermal heat utilization system and a geothermal heat utilization system that can be applied when constructing a geothermal heat utilization system that collects intermediate heat.

  In general, the temperature in the ground is almost constant throughout the year, and is lower in summer and higher in winter than the outside air temperature. Therefore, in order to efficiently perform cooling / heating, hot water supply, snow melting, etc. using the temperature difference between the ground and the outside air, a heat exchanger is buried in the ground, and anti-freezing liquid, water, etc. are placed inside the heat exchanger. Circulating fluid (heat medium) and exchanging heat between fluid and underground heat, and using the collected heat as a heat source for heat pump (that is, converting it to heat in the required temperature range) Heat utilization systems are known.

  According to such a geothermal heat utilization system, the collected geothermal heat can be used as a high-temperature energy for a heating heat source or a snow melting heat source in winter, and in summer, it can be used at a low temperature. It can be used as a heat source for cooling as energy.

For example, Patent Document 1 describes a technique in which a drilling hole is formed in the ground and a U-shaped tube is built in the drilling hole as a heat exchanger. In Patent Document 1, two (one pair) U-shaped pipes are overlapped with each other and inserted into a drilling pipe arranged inside a drilling hole in a united state. .
JP 2012-127116 [E21B 43/00]

  However, in the technique of Patent Document 1, since the curvature of the U-shaped joint portion of each U-shaped tube is large and the distance between the single tubes is clogged, the heat of the fluid flowing through each single tube interferes with the fluid. There was a concern that heat loss would increase and the heat exchange efficiency would decrease.

  On the other hand, it is conceivable to reduce the curvature of the U-shaped joint portion of each U-shaped tube. However, if this is done, the outer dimensions of the unit in which two U-shaped tubes are superposed side by side will increase. Since the size of the excavation hole formed in the ground must be increased by that amount, it takes time and effort to form the excavation hole, and the workability of the system is deteriorated.

  Therefore, a main object of the present invention is to provide a novel method for constructing a heat exchange device for a geothermal heat utilization system and a geothermal heat utilization system.

  Another object of the present invention is to provide a method for constructing a heat exchanging device for a geothermal heat utilization system and a geothermal heat utilization system that realizes the efficiency of the geothermal heat utilization system and has excellent workability. is there.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  1st invention is the heat | fever of the underground heat utilization system which collects ground heat with the fluid circulated through the inside of the U-shaped pipe which has a curved joint and two straight pipes connected to each end of a curved joint. An exchanging method for an exchanging device, comprising: (a) a step of excavating a bearing on the ground; (b) preparing two U-shaped tubes and placing a predetermined interval on the curved joint of one U-shaped tube; A step of placing the curved joints of the other U-shaped pipes so that the curved directions thereof are perpendicular to each other, and (c) fixing the curved joints stacked vertically in step (b) to fix the buried unit. Geothermal heat, comprising: (d) lowering the buried unit constructed in step (c) to the bottom of the resist, and (e) refilling the resist after step (d). It is the construction method of the heat exchange apparatus of a utilization system.

  According to the first invention, the two U-shaped pipes are inserted into the ridges so that the two U-shaped tubes intersect with each other so that the respective bending directions are orthogonal to each other, so that the two U-shaped pipes are inserted. Compared with the case where the pipes are overlapped to the side to form a unit, the external dimensions of the resisting can be reduced, and workability can be improved.

  In addition, since the curved joint of the other U-shaped tube is arranged so as to intersect the curved joint of one U-shaped tube, that is, between the straight pipes, It is possible to avoid the heat loss of the fluid by forming the curved joint of the U-shaped tube with a certain radius of curvature. In addition, since the curved joints of the U-shaped pipes are arranged with a space therebetween in the vertical direction, the heat of the fluid circulating in the curved joints of the U-shaped pipes is prevented from interfering with each other. be able to. Therefore, an efficient underground heat utilization system can be realized.

  The second invention is dependent on the first invention, and at least one of the two U-shaped pipes is provided with a spacing holding means for holding a spacing between the curved joints stacked one above the other. In b), the curved joints of the U-shaped tubes are stacked one above the other through the interval holding means.

  In the second invention, for example, the bent joint (32) of the U-shaped pipe (12) is formed with protrusions (40, 42) as a spacing maintaining means, and this protrusion is formed when the embedded unit (50) is configured. The space | interval of bending joints is hold | maintained by putting a U-shaped pipe up and down through a part.

  The third invention is dependent on the first or second invention, and in step (c), the curved joints stacked one above the other are fixed using a fastening tool.

  According to the third invention, it is possible to prevent the U-tube from being displaced when the embedded unit is inserted.

  The fourth invention is dependent on the third invention, and in step (c), the weight is connected to the fastening tool, and in step (d), the embedded unit is lowered with the weight suspended below.

  In the fourth invention, the weight (52) is connected to the fastening tool (46) that fixes the curved joints (32) of the two U-shaped pipes (12) arranged one above the other, and the weight is attached. The burying unit is inserted into the stand (104) while being hung below the burying unit (50).

  The fifth invention is dependent on the first or second invention, and in step (c), the bent joints stacked one above the other are bolted and fixed to the metal part.

  According to the fifth aspect, the shape of the embedded unit can be further stabilized.

  6th invention is a geothermal heat utilization system by which the heat exchange apparatus was constructed | assembled by the construction method of the heat exchange apparatus of the geothermal utilization system of 1st thru | or 5th invention.

  In the sixth invention, the underground heat utilization system (10) includes a U-shaped tube (12) as a heat exchange device, and the two U-shaped tubes intersect each other so that their bending directions are orthogonal to each other. The one that is placed one above the other is buried in the ground. Then, the heat pump (14) is connected to the U-shaped tube, and the ground heat is collected by circulating the fluid through the circulation pump (16) between the inside of the U-shaped tube and the heat pump.

  According to the sixth aspect of the invention, it is possible to realize a geothermal heat utilization system that is efficient and has excellent workability.

  According to the present invention, the two U-shaped tubes are united by being vertically overlapped with each other so that the bending directions thereof are orthogonal to each other, so that a decrease in efficiency of the underground heat utilization system is avoided. However, it is possible to improve workability.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is an illustration figure which shows the outline of the underground heat utilization system used as the background of one Example of this invention. It is an illustration figure which shows a mode that the U-shaped pipe of FIG. 1 was embed | buried in the ground. It is a perspective view which shows the bending joint of FIG. It is a top view which shows the bending joint of FIG. It is a perspective view which shows a mode that two U-shaped pipes were piled up and down. It is an illustration figure which shows the circle | round | yen which accommodates the projection area of the perpendicular direction of the two U-shaped pipe | tubes arrange | positioned up and down. It is a perspective view which shows a mode that the weight was suspended by the embedment unit. A circle that accommodates the vertical projection area of the two U-shaped tubes arranged on the side and a circle that accommodates the vertical projection area of the two U-shaped tubes arranged on the top and bottom of FIG. FIG. It is a perspective view which shows the principal part of the burying unit of the construction method of the heat exchange apparatus of the underground heat utilization system of another Example of this invention. It is a perspective view which shows the metal fitting components of FIG. It is a top view which shows the metal fitting components of FIG. It is the top view which looked at the embedding unit of FIG.

  A construction method of a heat exchange device of a geothermal heat utilization system according to an embodiment of the present invention (hereinafter sometimes simply referred to as “construction method”) is, for example, as shown in FIG. It is used to construct a geothermal heat utilization system 10 (hereinafter simply referred to as “system”) that effectively uses heat extracted from heat in a building 100 such as a house.

  Hereinafter, the system 10 will be described prior to the description of the construction method of the present invention.

  An example of a system 10 is illustrated in FIG. As shown in FIG. 1, the system 10 includes a U-tube 12 embedded in the ground 102 around the building 100 or under the floor, and a heat pump 14 connected to the U-tube 12. A fluid (heat medium) is circulated between the inside and the heat pump 14 by a circulation pump 16, and the underground heat collected by the fluid is used as a heat source for heating or cooling in an indoor device 18 such as an air conditioner. For example, antifreeze, water, or the like is used as the fluid.

  In this system 10, the inflow branch pipe 20 branched from the first header 22 is connected to the upper end of the forward straight pipe (first straight pipe 34) of each U-shaped pipe 12 dispersed and embedded. The inflow main pipe 24 connected to the heat pump 14 is connected to the first header 22. And the outflow branch pipe 26 branched from the second header 28 is connected to the upper end of the straight pipe (second straight pipe 36) for the return path of each U-shaped pipe 12, respectively. An outflow main pipe 30 connected to the heat pump 14 is connected.

  Since the configuration of the heat pump 14 is well known, a detailed description is omitted. However, in brief, in the system 10, the heat pump 14 circulates inside the U-shaped tube 12 and collects ground heat. Heat (thermal energy) is extracted from the fluid, and the heat is transferred to the second fluid. Then, the second fluid heated thereby is sent from the heat pump 14 to the indoor device 18, and heat is extracted by using the second fluid for heating in the indoor device 18. It is sent to the heat pump 14 to exchange heat with the fluid.

  In addition, although the case where the underground heat which the fluid collected in the ground was utilized as a heat source for heating in the indoor device 18 was described here in winter, the present invention is not limited to such a use. Please note that.

  Next, the U-shaped tube 12 will be described in detail. The U-shaped tube 12 is used as a heat exchange device in the system 10 and is provided from the ground to the ground surface. Specifically, as shown in FIG. 2, a counter-stretch 104 is excavated in a distributed manner on the ground 102 under or around the building 100, and two U-tubes 12 </ b> A and 12 </ b> B are provided in each stand 104. They are arranged one above the other in a state of intersecting so that the respective bending directions are orthogonal to each other.

  Hereinafter, in order to distinguish the U-shaped tube 12 according to its arrangement position or the like, 12A and 12B with subscripts A and B added to 12 are used, and 12 is used when these are comprehensively expressed.

  The U-shaped tube 12 includes a bending joint 32 and two straight pipes 34 and 36 connected to respective ends of the bending joint 32, and is disposed so as to extend vertically (in the vertical direction).

  The curved joint 32 is a joint of both receiving ports formed of a synthetic resin such as polyethylene, and has a main body 38 curved in a U shape. The curvature radius of the main body 38 is, for example, 35 mm. In addition, the receiving ports 38a formed at both ends of the main body 38 are opened upward, and the lower ends of the straight pipes 34 and 36 are connected to the receiving ports 38a by thermal fusion or the like, respectively. .

  As shown in FIGS. 3 and 4, a first protrusion 40 protruding upward is formed on the upper outer peripheral surface of the main body 38 at a position between the receiving ports 38 a and 38 a. The first protrusion 40 is formed in a substantially cylindrical shape, and its vertical length (height) is, for example, 15 mm, and its diameter is, for example, 15 mm. Further, a second protrusion 42 protruding downward is formed on the outer peripheral surface of the lower end of the main body 38. The 2nd protrusion 42 is formed in the substantially triangular plate shape, the height is 23 mm, for example, and the thickness is 6 mm, for example. The second protrusion 42 is formed with a through hole 42a penetrating in the thickness direction. For example, in this embodiment, the first projecting portion 40 and the second projecting portion 42 cooperate with each other to function as an interval holding means, and as will be described in detail later, two U-shaped tubes 12A and 12B are connected to each other. When they are stacked one above the other in a state where they intersect so that the bending directions are orthogonal to each other, a fixed interval is held between the bending joints 32 by this interval holding means.

  In addition, a recess 44 is formed in the center of the main body 38 in the bending direction. The hollow portion 44 is a hollow in which the outer peripheral surface in the direction perpendicular to the bending direction is recessed in a curved shape, and is formed in a shape along the outer peripheral surface of the straight pipe 34 of the U-shaped tube 12. ing. For example, in this embodiment, the depressions 44 function as positioning means, and, as will be described in detail later, U portions arranged on the lower side of the depressions 44 of the curved joint 32 of the U-shaped pipe 12B arranged on the upper side. By running along the straight pipes 34 and 36 of the character tube 12A, the two U-tubes 12A and 12B can be crossed so that the bending directions thereof are orthogonal to each other.

  Returning to FIG. 2, the straight pipes 34 and 36 are long pipes having a sufficient length to correspond to the depth of the stand 104 and have a diameter of, for example, 32 mm. The straight pipes 34, 36 are provided so as to protrude outward from the resister 104, and the upper end of the forward straight pipe (first straight pipe) 32 serves as an intake port for taking in fluid from the inflow branch pipe 20, and the return path The upper end of the straight pipe (second straight pipe) 34 is a delivery outlet for sending fluid to the outflow branch pipe 28.

  The system 10 constructed by the construction method of the present invention has been described above. The construction method according to one embodiment of the present invention will be described below on the premise of such a system 10 and using them as necessary.

  However, the present invention is characterized in the method of constructing the heat exchange device of the system 10, and the remaining portion may be changed. Therefore, in any of the following embodiments, the U-shaped tube 12 of the system 10 is used. It should be noted that the illustration and explanation are centered on the method of piping.

  Referring to FIG. 2, first, a plurality of ridges 104 are formed by being distributed around the building 100 or on the ground 102 under the floor. That is, using a dedicated drilling machine (not shown) or the like, the ground 102 is excavated in the vertical direction by a casing for excavation provided with an excavating blade (bit) at the tip, and a resistance of a predetermined depth is resisted. 104 is formed. For example, a metal pipe or a synthetic resin pipe can be used for the casing. In addition, the external dimensions of the ridge 104 are such that an embedded unit 50 (to be described later) can be inserted (arranged) at least on the inner peripheral side of the casing, that is, the vertical projection shape of the embedded unit 50 is accommodated on the inner peripheral side of the casing. Is set as follows.

  In addition, since it is known that the temperature of geothermal heat frequently changes up to about 15 m from the ground surface, but it is known that it is stable around the annual average temperature when it becomes deeper than about 15 m, this system 10 also has It is preferable to appropriately set the depth of the resisting wall 104 so that the U-shaped tube 12 reaches an area where the underground heat is stable. For example, in this embodiment, the depth of the resisting 104 is set to 15-100 m.

  Next, a U-shaped tube 12 used as a heat exchange device is prepared. For example, the U-shaped tube 12 is carried into the construction site while being wound around a drum (not shown). At the construction site, the inside of the U-shaped tube 12 is filled with fluid, and the tube ends of the straight tube portions 32 and 34 are sealed with caps or the like. Then, the U-shaped tube 12 is installed in a state where it can be pulled out from the drum, for example, by placing the drum on a turntable rotatable in the circumferential direction. In this embodiment, since the two U-shaped tubes 12A and 12B are combined and inserted into the stand 104, two drums are installed around the stand 104, and each U-tube 12A is provided from each drum. , 12B may be installed so that it can be pulled out.

  Subsequently, the two U-shaped tubes 12 </ b> A and 12 </ b> B are pulled out from the respective drums, and are combined into a unit to constitute the embedded unit 50.

  Specifically, first, two U-shaped tubes 12A and 12B drawn out from the drum are arranged vertically. Then, as shown in FIG. 5, the outer peripheral surfaces of the straight pipes 34 and 36 of the U-shaped pipe 12 </ b> A arranged on the lower side are aligned with the recess 44 of the curved joint 32 of the U-shaped pipe 12 </ b> B arranged on the upper side. , The two protrusions 42 of the curved joint 32 of the U-shaped tube 12B are brought into contact with the distal ends (upper ends) of the first projected parts 40 of the curved joint 32 of the U-shaped tube 12A. The character tubes 12A and 12B are arranged so as to overlap each other in a state where they intersect so that the respective bending directions are orthogonal to each other.

  At this time, by arranging the first protrusion 40 of the U-shaped tube 12A and the second protrusion 42 of the U-shaped tube 12B to be in contact with each other, the curved joints 32 of the U-shaped tubes 12A and 12B are connected to each other. It arrange | positions at intervals d (refer FIG. 2). For example, in this embodiment, the distance d is set to 36 mm. Further, as shown in FIG. 6, the U-shaped pipes 12A and 12B are arranged by crossing the curved joint 32 of the other U-shaped pipe 12B on the curved joint 32 of one U-shaped pipe 12A. The projection shape in the vertical direction is a size that fits within a circle of radius R1. For example, in this embodiment, the radius R1 of the circle is set to 56 mm.

  Then, as shown in FIG. 7, the fastening tool 46 is inserted into the insertion holes 32 a of the second protrusions 42 of the curved joints 32 of the two U-shaped tubes 12 </ b> A and 12 </ b> B, and tightened together with the fastening tool 46. An embedded unit 50 in which the two U-shaped tubes 12A and 12B are fixed (unitized) is configured. For example, as the fastening tool 46, a wire or an insulation lock can be used, but it is not necessary to be limited to this.

  Next, a weight 52 for preventing the buried unit 50 from floating due to groundwater or the like when inserted is connected to the lower side of the buried unit 50 and inserted into the stand 104. Specifically, the weight 52 is connected to the fastening tool 46, and with the weight 52 suspended below the buried unit 50, the buried unit 50 is inserted into the stand 104 and lowered inside the stand 104. Except for FIG. 7, illustration of the fastening tool 46 and the weight 52 is omitted for simplification of the drawing.

  Then, when the tip of the embedding unit 50 reaches the bottom of the stand 104, the casing is pulled out from the stand 104 while filling the stand 104 with soil or the like generated when the stand 104 is excavated. At this time, if the soil is backfilled while vibration is applied to the casing, the soil 104 is filled with no gap, which is preferable.

  Thereafter, in the same manner as described above, the embedding unit 50 is disposed in all the remaining resists 104, and the operation is completed.

  As described above, in this embodiment, at the time of construction of the U-shaped tube 12 on the stand 104, the two U-shaped tubes 12A and 12B are overlapped with each other so that the respective bending directions are orthogonal to each other. The embedded unit 50 thus arranged is inserted into the resister 104.

  For this reason, for example, as in Patent Document 2, it is possible to reduce the external dimensions required for the resisting unit 104 as compared with a case where two U-shaped tubes are overlapped to the side to form a unit.

  Here, as described above, when the two U-shaped tubes 12A and 12B are united by overlapping vertically with their respective bending directions intersecting each other, the U-shaped tubes 12A and 12B (embedded) Since the vertical projection shape of the unit 50) will be within the circle with the radius R1, the outer dimension of the resisting 104 may be set to a size at which the insertion hole 108 is at least a circle with the radius R1, As shown in FIG. 8, when two U-shaped tubes are united by overlapping each other, the projected shape in the vertical direction of the unit is a circle having a radius R2 (R2> R1) larger than the radius R1. Although it fits within, it does not fit within a circle of radius R1. Therefore, it is necessary to set the outer dimension of the resisting plate 104 so that the inner peripheral side of the casing becomes a circle having a radius R2 so that the unit can be inserted. For example, the radius R2 of the circle is 63 mm.

  That is, according to this embodiment, the two U-shaped tubes 12A and 12B are united by being vertically stacked in a state where the respective U-shaped tubes 12A and 12B cross each other so as to be orthogonal to each other, thereby reducing the diameter on the inner peripheral side of the casing. It becomes possible to make it small by R3 (R2-R1), and the external dimension of the resisting body 104 can be made small by that much. Therefore, it becomes possible to perform the operation of excavating the resister 104 more easily and at low cost, and the workability can be improved.

  Further, in this embodiment, the curved joint 32 of the other U-shaped tube 12B is arranged so as to cross over the curved joint 32 of one U-shaped tube 12A, that is, between the straight tube 34 and the straight tube 36. Accordingly, the curved joint 32 of the U-shaped tube 12 can be formed with a certain radius of curvature while preventing a useless space from being generated. Therefore, it is possible to avoid heat loss of the fluid.

  In addition, the curved joints 32 of the two U-shaped pipes 12A and 12B are disposed in a state where they are vertically spaced apart from each other by a distance d so that the curved joints 32 are separated from each other so that they do not contact each other. It is possible to prevent the heat of the fluid circulating in the curved joints 32 of the pipes 12A and 12B from interfering with each other, and to prevent the heat exchange efficiency from being lowered.

  Therefore, according to this embodiment, an efficient underground heat utilization system 10 can be realized.

  In the above-described embodiment, when the embedded unit 50 is configured, the fastening tool 46 is inserted into the insertion hole 32a of the second protrusion 42 of each of the curved joints 32 of the two U-shaped pipes 12A and 12B that are arranged one above the other. The U-shaped tube 12A and the U-shaped tube 12B are fixed by inserting and tightening them together with the tightening tool 46, but the present invention is not limited to this.

  For example, in the modified embodiment of the embedding unit 50 shown in FIG. 9, in this embodiment, the U-shaped tube 12A and the U-shaped tube 12B are stacked one above the other with the respective bending directions intersecting each other. They are fixed by bolting them to the metal part 54 with bolts 60 and 62. Hereinafter, the same reference numerals are used for the same parts as those of the embedding unit 50 shown in FIG. 7, and the description thereof is omitted or simplified.

  As shown in FIGS. 10 and 11, the metal fitting 54 is made of metal such as iron or stainless steel, and includes a first main body 56 and a second main body 58. The first body 56 is a flat plate extending in the vertical direction, and its longitudinal direction, that is, the length in the vertical direction is, for example, 100 mm, its width is, for example, 26 mm, and its thickness is, for example, 4 mm. A bolt hole 56 a penetrating in the thickness direction is formed at a predetermined position of the upper end portion of the first main body 56. A second main body 58 is integrally formed at the lower end of the first main body 56.

  The second main body 58 extends in the width direction of the first main body 56 from one side edge in the width direction of the first main body 56 and bends at a right angle near the center of the first main body 56 in the thickness direction of the first main body 56. It is a substantially L-shaped flat plate extending, and its length in the longitudinal direction is, for example, 35 mm, its width, that is, the length in the vertical direction is, for example, 20 mm, and its thickness is, for example, 4 mm. A bolt hole 58a penetrating in the thickness direction is formed at a predetermined position of a tip portion of the second body 58, that is, a portion extending in the thickness direction of the first body 56.

  Referring to FIGS. 9 and 12, when constructing such an embedding unit 50, first, two U-shaped tubes 12A and 12B are stacked one above the other with their respective bending directions intersecting each other. Arrange. Then, the two metal fitting parts 52 are arranged so as to sandwich the curved joint 32 of the U-shaped pipe 12A arranged on the lower side, the bolt hole 56a of the first main body 56 of one metal fitting part 54, the U arranged on the lower side. The bolt 60 is inserted into the through hole 42a of the second protrusion 42 of the character tube 12A and the bolt hole 56a of the first main body 56 of the other metal fitting 54 and fixed with a nut or the like. The bolt 62 is inserted into the bolt hole 58a of the main body 58, the through hole 42a of the second protrusion 42 of the U-shaped tube 12B disposed on the upper side, and the bolt hole 58a of the second main body 58 of the other metal fitting part 54. Fix by etc.

  In such an embedment unit 50, the curved joints 32 of the two U-shaped pipes 12A and 12B, which are stacked one above the other, are bolted to the metal fittings 54, respectively. The shape of the embedded unit 50 can be further stabilized as compared with the case where 32 is fastened and fixed by the fastening tool 46. Therefore, even when the embedded unit 50 is inserted into the stand 104 and lowered through the stand 104, there is no concern that the curved joint 32 of the U-shaped tubes 12A, 12B will be displaced.

  In each of the above-described embodiments, when the first protrusion 40 and the second protrusion 42 are formed on the bending joint 32 of the U-shaped tube 12 to constitute the embedded unit 50, the bending of the U-shaped tube 12A is performed. By bending the tip (upper end) of the first protrusion 40 of the joint 32 and the tip (lower end) of the second protrusion 42 of the curved joint 32 of the U-shaped tube 12B, the two U-shaped tubes 12A and 12B are bent. Although the joints 32 are spaced apart from each other by the distance d, it is not necessary to be limited to this.

  For example, when only the first protrusion 40 is formed on the curved joint 32 of the U-shaped tube 12 and the embedded unit 50 is configured, the first projected portion 40 of the curved joint 32 of the U-shaped tube 12A is curved of the U-shaped tube 12B. The U-tube 12B may be abutted against the lower side of the joint 32, or when only the second protrusion 42 is formed on the curved joint 32 of the U-shaped tube 12 to constitute the embedded unit 50, the curved shape of the U-shaped tube 12B. The second protrusion 42 of the joint 32 may be abutted against the upper side of the curved joint 32 of the U-shaped tube 12A.

  Further, for example, a first fitting portion is formed at the tip (upper end) of the first protrusion 40 of the curved joint 32 of the U-shaped tube 12A, and the second protrusion 42 of the curved joint 32 of the U-shaped tube 12B. A second fitting portion that fits with the first fitting portion is formed at the tip (lower end), and the first fitting portion and the second fitting portion are fitted when the curved joints 32 are vertically stacked. You may make it make it. If it does in this way, the shape of embedding unit 50 can be stabilized more.

  Furthermore, for example, another member may be sandwiched between the curved joint 32 of the U-shaped tube 12A and the curved joint 32 of the U-shaped tube 12B, thereby maintaining the distance between the curved joints 32.

  Furthermore, in the above-described embodiment, the tightening tool 46 and the bolts 60 and 62 are inserted into the insertion hole 32a of the second protrusion 42 that functions as the interval holding portion in the U-shaped tube 12. However, the present invention is not limited to this. There is no need. The U-shaped tube 12 </ b> A and the U-shaped tube 12 </ b> B may be fixed by directly tightening the main bodies 38 of the respective curved joints 32 with the fastening tool 46, or the main body 38 of each curved joint 32. A portion for inserting the bolts 60 and 62 is separately formed, and the U-tube 12A and the U-tube 12B are fixed by bolting to the metal fitting 54 with the bolts 60 and 62 inserted therethrough. May be.

  Further, it is not always necessary to fix the curved joints 32 of the two U-shaped pipes 12A and 12B, which are stacked one above the other, by fastening them with the fastening tool 46 or by bolting them to the metal part 54. Alternatively, the U-shaped tube 12A and the U-shaped tube 12B may be fixed by fixing the straight tubes 34, 36 of the two U-shaped tubes 12A, 12B with appropriate fixing means. These methods may be used in combination.

  By the way, although the above-mentioned Example demonstrates assuming the case where the system 10 is applied to a house, the system 10 can be applied not only to a house but also to general buildings such as warehouses and offices equipped with air conditioning facilities. Needless to say.

  Further, the specific numerical values such as the diameter and the height described above are merely examples, and can be appropriately changed as necessary.

10 ... Ground heat utilization system 12 ... U-shaped tube (heat exchanger)
DESCRIPTION OF SYMBOLS 14 ... Heat pump 16 ... Circulation pump 32 ... Curved joint 34, 36 ... Straight pipe 46 ... Fastening tool 50 ... Embedded unit 54 ... Bracket parts 104 ... Resistance

Claims (6)

Method for constructing heat exchange device for geothermal heat utilization system for collecting geothermal heat by fluid circulated inside U-shaped pipe having curved joint and two straight pipes connected to each end of said curved joint Because
(A) a step of excavating a resist against the ground;
(B) Two U-shaped tubes are prepared, and the curved joint of the other U-shaped tube is placed on the curved joint of one U-shaped tube at a predetermined interval and perpendicular to each other. The step of placing them on top of each other,
(C) fixing the curved joints stacked in the upper and lower directions in the step (b) to constitute an embedded unit;
(D) lowering the buried unit constructed in step (c) to the bottom of the resist, and (e) using the geothermal heat, including the step of refilling the resist after the step (d). System heat exchanger installation method. At least one of the two U-shaped tubes is provided with an interval holding means for holding an interval between the curved joints stacked one above the other.
The construction method of the heat exchanging device of the underground heat utilization system according to claim 1, wherein in the step (b), the curved joints of the U-shaped pipes are stacked one above the other through the interval holding means.   The construction method of the heat exchange apparatus of the geothermal heat utilization system of Claim 1 or 2 which fixes the bending joints piled up and down using the clamp in the said step (c). In the step (c), a weight is connected to the clamp,
The construction method of a heat exchange device for a geothermal heat utilization system according to claim 3, wherein in the step (d), the buried unit is lowered in a state where the weight is suspended downward.   The construction method of the heat exchange apparatus of the geothermal heat utilization system according to claim 1 or 2, wherein in the step (c), the bent joints stacked one above the other are bolted and fixed to the metal part.   A geothermal heat utilization system in which a heat exchange device is constructed by the construction method of the heat exchange device of the geothermal heat utilization system according to any one of claims 1 to 5.

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