JP2013134035A - Air conditioning device using geothermal heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability, and also achieve superior space-saving properties, low-cost properties and versatility.SOLUTION: An air conditioning device 1 using geothermal heat exchanges heat of external air 6 with geothermal heat and supplies the air to the inside of a building. The air conditioning device 1 using geothermal heat includes a pipe-like geothermal heat exchanging part 2, which is buried in the ground G and exchanges heat of external air 6 with geothermal heat. At least a portion of the geothermal heat exchanging part 2 comprises a flexible pipe 11 that can freely flex. The flexible pipe 11 has superior flexibility, so that the pipe can follow and flexibly deform, even if a ground pressure or a load during an earthquake acts on the pipe.

Description

  The present invention relates to an air conditioner using geothermal heat, and in particular, can prevent damage to a geothermal heat exchanging portion embedded in the ground, improve durability, and save space, low cost, and versatility. The present invention relates to an air conditioner using geothermal heat that is superior to the above.

  In recent years, due to demands for energy saving, an air conditioner using geothermal heat has been proposed (see, for example, Patent Document 1 below). As this type of typical air conditioner, what is called a so-called cool tube is known that supplies the underground heat exchange section buried in the ground to the inside of the building via the outside air.

  In general, the underground temperature is lower in summer and higher in winter than the outside air temperature. Therefore, in the summer, the air conditioner can cool high-temperature outside air through the underground heat exchange unit and supply it to the inside of the building, and in winter, the cold outside air can be heated by the underground heat exchange unit and supplied to the inside of the building. There is.

JP 2010-223511 A

  However, since the conventional underground heat exchange part consists of pipes, such as a PVC pipe which cannot be bent, it cannot change according to earth pressure or the load at the time of the occurrence of an earthquake. For this reason, in the above air conditioners, damage to the underground heat exchange part could not be sufficiently prevented, and further improvement in durability was demanded. In addition, since the underground heat exchange section cannot be flexibly arranged depending on the construction site, there is a problem that space saving, low cost, and versatility are likely to be deteriorated.

  The present invention has been devised in view of the actual situation as described above, and can improve durability on the basis of forming at least a part of the underground heat exchange portion with a flexible tube that can be bent. The main purpose is to provide an air conditioner using geothermal heat that is excellent in space saving, low cost and versatility.

  The invention according to claim 1 of the present invention is an air conditioner using geothermal heat for exchanging heat from the outside air with underground heat and supplying it to the inside of the building. It includes a pipe-shaped underground heat exchanging portion for exchanging heat, and at least a part of the underground heat exchanging portion is made of a flexible tube that can be bent.

  The invention according to claim 2 is the air conditioner using geothermal heat according to claim 1, wherein the flexible tube extends in a vertical spiral shape in which the axis of the spiral is the vertical direction.

  The invention according to claim 3 is the air conditioner using geothermal heat according to claim 1, wherein the flexible tube extends in a zigzag shape in the vertical direction.

  According to a fourth aspect of the present invention, the underground heat exchanging unit includes an introduction unit that introduces outside air into the flexible tube, and a supply unit that supplies the outside air heat-exchanged by the flexible tube into the building. One end of the flexible tube is connected to the introduction portion, and the other end of the flexible tube is connected to the supply portion, and the flexible tube is inclined downward from the one end toward the other end. It is an air conditioner using geothermal heat according to any one of claims 1 to 3 having a drainage gradient.

  The invention according to claim 5 includes an underground support jig that supports the flexible pipe to maintain the drainage gradient in the ground and / or the separation of the flexible pipes adjacent in the vertical direction. An air conditioner using geothermal heat according to claim 4.

  According to a sixth aspect of the present invention, the introduction portion includes a first vertical pipe extending in the vertical direction and communicating with the one end side of the flexible tube via the first branch portion, and the first branch portion. The air conditioner using geothermal heat according to claim 4 or 5, wherein the outside air introduced into the first vertical pipe is bent at an obtuse angle and guided to the flexible pipe.

  In the invention according to claim 7, the introduction part further includes an introduction pipe having one end opened on the ground and the other end communicating with the first vertical pipe via the second branch part, and the second branch The portion is provided above the first branch portion, and the second branch portion guides the outside air introduced from the introduction pipe to the first branch portion side by bending it at an obtuse angle. It is an air conditioner using the described geothermal heat.

  According to an eighth aspect of the present invention, the supply unit includes a second vertical pipe extending in the vertical direction, and the second vertical pipe has a third branch portion communicating with the other end side of the flexible tube. The third branch portion is provided above the bottom portion of the second vertical pipe, and the third branch portion is inclined to guide the drainage in the flexible tube to the bottom portion of the second vertical pipe. It is an air conditioner using geothermal heat according to any one of claims 4 to 7.

  According to a ninth aspect of the present invention, the supply unit includes a second vertical pipe extending in the vertical direction, one end opened inside the building, and the other end via the second vertical pipe and the fourth branching unit. 8. The underground according to claim 4, wherein the fourth branch portion guides the outside air introduced into the second vertical pipe to the supply pipe by bending it at an obtuse angle. It is a heat-utilizing air conditioner.

  The air conditioner using geothermal heat of the present invention exchanges the outside air with geothermal heat and supplies it to the inside of the building. This air conditioner includes a pipe-shaped underground heat exchanging section that is buried in the ground and exchanges heat of the outside air with underground heat.

  Such an air conditioner can supply high-temperature outside air to the building in the summer by cooling it in the underground heat exchanger. In winter, cold outdoor air can be warmed by the underground heat exchanger and supplied into the building. Thereby, the air conditioner can air-condition the room without using large energy such as an air conditioner, and can improve energy saving.

  Further, at least a part of the underground heat exchanging portion is made of a flexible tube that can be bent. Such a flexible tube can be flexibly deformed following the earth pressure or the load at the time of the occurrence of an earthquake, so that the underground heat exchange part can be prevented from being damaged and the durability can be improved. Furthermore, since the flexible tube can be flexibly arranged according to the construction site, space saving performance, low cost, and versatility can be improved.

It is sectional drawing which shows notionally the air-conditioning apparatus using geothermal heat of this embodiment. It is a perspective view which shows an underground heat exchange part. It is a fragmentary sectional view of a flexible tube. It is a perspective view which shows an underground support jig. It is sectional drawing which shows notionally the underground heat exchange part of other embodiment. It is sectional drawing which shows a 1st branch part and a 2nd branch part. It is sectional drawing which shows a 3rd branch part and a 4th branch part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, an air conditioner (hereinafter sometimes simply referred to as “air conditioner”) 1 according to the present embodiment is an air conditioner for a building H such as a general house or building. Used as

  The air conditioner 1 of this embodiment is provided adjacent to the building H. The air conditioner 1 is provided with, for example, a pipe-shaped underground heat exchanging section 2 that is embedded in the underground G such as a garden and exchanges heat of the outside air 6 with underground heat.

  In such an air conditioner 1, the outside air 6 supplied to the underfloor space 7 passes from the openings 10 a and 10 b provided in the floor portion to the living rooms L through the air flow paths formed inside the building H. Supplied with. Thereby, the air conditioner 1 can cool the high temperature outside air 6 in the underground heat exchange unit 2 in summer and supply it to the inside of the building. In winter, the cold outside air 6 can be supplied in the underground heat exchange unit 2. It can be warmed and supplied inside the building. Therefore, the air conditioner 1 can air-condition the inside of the building H without using large energy such as an air conditioner, and can improve energy saving.

  As shown in FIGS. 1 and 2, the underground heat exchanging unit 2 of the present embodiment includes a flexible tube 11 that can be bent, an introduction unit 3 that introduces outside air into the flexible tube 11, and the flexible tube 11. The supply unit 4 is configured to supply the outside air 6 heat-exchanged by the pipe 11 to the inside of the building H (in the present embodiment, the underfloor space 7).

  The flexible tube 11 is embedded, for example, at a depth of about 1 to 4 m from the ground surface, and extends in a vertical spiral shape in which a spiral shaft 11s is in the vertical direction. In the present embodiment, one end 11i of the flexible tube 11 is connected to the introduction part 3, and the other end 11o is connected to the supply part 4. Between the one end 11i and the other end 11o, approximately two rounds in the vertical direction. It has been wound around.

  As shown in FIG. 3, the flexible tube 11 has a base portion 11 </ b> Wa extending in the longitudinal direction and a base portion 11 </ b> Wa extending in the longitudinal direction in a cross section along the longitudinal direction, and projecting outward from the base portion 11 </ b> Wa. And crests 11Wb spaced apart from each other. Further, the peak portion 11Wb is provided with a hollow portion 18 inside thereof.

  Such a flexible tube 11 can be bent at an arbitrary position in the longitudinal direction while keeping the inner surface of the side wall surface 11W smooth, and is excellent in flexibility. In addition, since the hollow portion 18 is provided in the peak portion 11Wb, it helps to reduce the weight of the flexible tube portion 11 while maintaining the strength of the flexible tube portion 11 (circular holding). The flexible tube 11 preferably has an inner diameter D1 of, for example, about 100 to 300 mm, and is preferably formed of a synthetic resin such as polyethylene or a metal.

  Thus, since the flexible tube 11 is excellent in flexibility, even if earth pressure or a load at the time of occurrence of an earthquake acts, the flexible tube 11 can be flexibly deformed following them. Therefore, the flexible tube 11 can prevent the underground heat exchange part 2 from being damaged, and can improve durability.

  Further, as shown in FIGS. 1 and 2, since the flexible tube 11 extends in a vertical spiral shape, the occupied land area can be reduced while maintaining the volume of the space for heat exchange of the outside air 6. Therefore, the air conditioner 1 can be flexibly installed in a small place such as a parking lot space having a relatively small land area, and is excellent in space saving and versatility.

  And since the underground heat exchange part 2 of this embodiment is comprised including the one or several flexible tubes 11, it connects a pipe | tube and a pipe | tube compared with the conventional underground heat exchange part. Joint locations can be greatly reduced. Thereby, the underground heat exchange part 2 can suppress the damage which tends to occur in a joint location while being able to improve workability and low cost property.

  Further, in order to increase the heat exchange rate in the flexible tube 11, it is desirable that the interval W2 between the flexible tubes 11 that are vertically overlapped is set to 300 to 500 mm. If the interval W2 is less than 300 mm, the interval between the flexible tubes 11 that overlap each other becomes small, and there is a possibility that sufficient heat exchange cannot be performed. On the other hand, when the interval W2 exceeds 500 mm, it is necessary to excavate deeply in the ground, and there is a possibility that the workability and the low cost are lowered.

  Moreover, it is desirable that the flexible tube 11 has a drainage gradient α1 that is inclined downward from the one end 11i side toward the other end 11o side. As a result, the flexible tube 11 can smoothly drain the dew generated inside the tube to the other end 11o along the inclination, and effectively suppress the generation of mold and off-flavor due to the dew condensation. Yes. In order to effectively exhibit such an action, the drainage gradient α1 of the flexible tube 11 is desirably about 1/80 to 1/120.

  As shown in FIG. 4, in order to reliably maintain the drainage gradient α1 in the ground, the underground heat exchanging section 2 is provided with an underground support jig 12 that supports the flexible tube 11. May be. A pair of the underground support jigs 12 are provided on both sides of the spiral shaft 11s.

  The underground support jig 12 includes a leg portion 13 extending horizontally along the longitudinal direction of the flexible tube 11, an upright portion 14 extending upward from the leg portion 13, and a lower portion disposed on the leg portion 13. A side support portion 15 and an upper support portion 16 disposed on the upright portion 14 are provided.

  The leg portion 13 is composed of a pair of cross members 13 a and 13 a arranged with a gap 13 w in the width direction of the flexible tube 11. Such a leg portion 13 can stably support the loads of the flexible tube 11 and the underground support jig 12 before the underground heat exchanging portion 2 is embedded.

  A pair of the raised portions 14 are provided apart from each other in the longitudinal direction of the leg portion 13. Each upright portion 14 includes a pair of vertical members 14a and 14a extending upward from the pair of horizontal members 13a and 13a.

  The lower support portion 15 extends from a plurality (four in this embodiment) of the joint members 15a that straddle between the pair of transverse members 13a and 13a and are spaced apart in the longitudinal direction of the transverse member 13a. Become. These joint members 15a have different heights H3 from the cross member 13a, and gradually decrease along the drainage gradient α1 (shown in FIG. 1) of the flexible tube 11.

  The upper support portion 16 is composed of a pair of joint members 16a disposed across a pair of longitudinal members 14a, 14a. In these joint members 16a, the height H4 from the cross member 13a gradually decreases along the drainage gradient α1 (shown in FIG. 1) of the flexible tube 11.

  Such an underground support jig 12 is configured such that each flexible tube 11 is mounted on the joint material 15a of the lower support portion 15 and the joint material 16a of the upper support portion 16 by placing the flexible tube 11 thereon. Positioned. Thereby, the underground support jig 12 can be stably supported while maintaining the separation between the flexible tubes 11 adjacent in the vertical direction. The underground support jig 12 has a flexible tube because the heights H3 and H4 of the lower support portion 15 and the upper support portion 16 gradually decrease along the drainage gradient α1 of the flexible tube 11. 11 drainage gradients α1 can be reliably maintained.

  Therefore, the underground support jig 12 is embedded while supporting the flexible tube 11, thereby maintaining the drainage gradient α <b> 1 and the separation between the adjacent flexible tubes 11 in the upper and lower directions, and the flexible tube 11. It can be easily embedded in any spiral shape. Moreover, since the underground support jig 12 can support the flexible tube 11 even in the ground, the separation of the drainage gradient α1 and the flexible tube 11 can be maintained over a long period of time.

  In the present embodiment, the flexible tube 11 extends in a vertical spiral shape, but is not limited thereto. For example, as shown in FIG. 5, the flexible tube 11 may extend in a zigzag shape in the vertical direction. Such a flexible tube 11 can also occupy a small land area while maintaining a space necessary for heat exchange of the outside air 6.

  As shown in FIG. 1, the introduction portion 3 includes a first vertical pipe 3A extending in the vertical direction, an introduction pipe 3B having one end 3Bi open on the ground and the other end 3Bo communicating with the first vertical pipe 3A. Including.

  As shown in FIG. 6, the first vertical pipe 3 </ b> A includes a plurality of pipe portions 21 extending in the axial direction of the first vertical pipe 3 </ b> A, and a first branching portion 22 that connects a pair of adjacent pipe portions 21. And a second branch portion 23 that is provided above the first branch portion 22 and connects a pair of adjacent pipe portions 21.

  The pipe portion 21 is formed in a pipe shape extending with an inner diameter D2 of about 150 to 250 mm, for example.

  The first branch portion 22 includes a vertical pipe portion 22a that extends vertically with an inner diameter equal to the inner diameter D2 of the pipe portion 21, and a branch pipe portion 22b that branches from the vertical pipe portion 22a and protrudes laterally.

  The vertical pipe portion 22a is provided with a pair of enlarged diameter portions 22at at both ends, into which the end portion 21t of the pipe portion 21 can be inserted densely. Further, the branch pipe portion 22b is formed with an enlarged diameter portion 22bt capable of closely communicating the one end 11i of the flexible tube 11 at the end thereof. Further, the branch pipe portion 22b extends downwardly from the vertical pipe portion 22a toward the enlarged diameter portion 22bt.

  Such a first branch portion 22 can bend the outside air 6 introduced into the first vertical pipe 3 </ b> A to an obtuse angle and guide it to the flexible tube 11. Therefore, the 1st branch part 22 can make small the air resistance between the introductory pipe 3B and the flexible tube 11, and can ensure the blowing air volume required for the air conditioner 1 easily. In order to effectively exhibit such an action, the angle α5a formed by the vertical pipe portion 22a and the branch pipe portion 22b of the first branch portion 22 is desirably about 120 to 150 degrees.

  The second branch part 23 includes a vertical pipe part 23 a and a branch pipe part 23 b, similar to the first branch part 22. A pair of enlarged diameter portions 23at are provided at both ends of the vertical pipe portion 23a.

  The branch pipe part 23b protrudes from the vertical pipe part 23a and extends upwardly at a position rotated 180 degrees around the vertical axis from the branch pipe part 22b of the first branch part 22. Further, the branch pipe portion 23b is provided with an enlarged diameter portion 23bt at the end portion thereof that can communicate with the other end 3Bo of the introduction pipe 3B in close contact with each other.

  Such a 2nd branch part 23 can bend the outside air 6 introduced from the introduction pipe 3B to an obtuse angle, and can guide it to the 1st branch part 22 side. Therefore, the second branch portion 23 can reduce the air resistance between the introduction pipe 3 </ b> B and the first branch portion 22. The angle α5b formed by the vertical pipe portion 23a and the branch pipe portion 23b of the second branch portion 23 is preferably in the same range as the angle α5a of the first branch portion 22.

  As shown in FIG. 1, the first vertical pipe 3 </ b> A is preferably provided with an opening 28 that protrudes and opens from the ground at the upper end side thereof. Such an opening 28 is useful for taking out moisture and foreign matters such as condensation accumulated on the bottom 3Ab of the first vertical pipe 3A. The opening 28 is preferably provided with a lid 29 that prevents foreign matter such as rainwater and pests from entering the first vertical pipe 3A.

  Furthermore, a drain (not shown) that discharges moisture such as condensation into the ground may be provided at the bottom 3Ab of the first vertical pipe 3A. Such a drain can effectively suppress the generation of mold and off-flavor caused by moisture remaining in the bottom 3Ab.

  As shown in FIGS. 1 and 6, the introduction pipe 3 </ b> B is formed in a pipe shape extending with an inner diameter equal to the inner diameter D <b> 2. The introduction pipe 3B of the present embodiment includes an inclined portion 3Ba extending from the branch pipe portion 23b of the second branch portion 23 toward the ground, and an outside air introducing portion 3Bb extending from the end of the inclined portion 3Ba to the ground. Including.

  One end 3Bi of the outside air introduction part 3Bb is connected to an opening 42 that is exposed to the ground and that is curved downward by about 180 degrees and opens downward. Such an opening 42 can prevent rainwater or the like from entering the outside air introduction portion 3Bb. Further, it is desirable that a filter (not shown) for preventing insects and foreign substances from entering is disposed in the opening 42.

  Further, it is desirable that the angle α5c formed by the inclined portion 3Ba and the outside air introduction portion 3Bb is set to an obtuse angle. Accordingly, the introduction pipe 3B can reduce the air resistance between the inclined portion 3Ba and the outside air introduction portion 3Bb, and can smoothly guide the outside air 6. The angle α5c is preferably in the same range as the angles α5a and α5b.

  As shown in FIG. 1, the supply unit 4 of the present embodiment includes a second vertical pipe 4A extending in the vertical direction, one end 4Bi opening inside the building H, and the other end 4Bo being the second vertical pipe 4A. A supply pipe 4B communicating with the vehicle is included.

  As shown in FIG. 7, the second vertical pipe 4A includes a plurality of pipe parts 31 and a second pipe part 31 that is provided above the bottom part 4Ab of the second vertical pipe 4A and connects a pair of adjacent pipe parts 31. It has the 3 branch part 32 and the 4th branch part 33 which is provided above the 3rd branch part 32, and connects a pair of adjacent pipe parts 31. As shown in FIG.

  The pipe portion 31 is formed in a pipe shape extending at the inner diameter D2, similarly to the pipe portion 21 (shown in FIG. 6) of the first vertical pipe 3A.

  The third branch portion 32 includes a vertical pipe portion 32a and a branch pipe portion 32b, similarly to the first and second branch portions 22 and 23 (shown in FIG. 6).

  The vertical pipe portion 32a is provided with a pair of enlarged diameter portions 32at at both ends thereof. Further, the branch pipe portion 32b extends upwardly from the vertical pipe portion 32a. Further, the branch pipe portion 32b has an enlarged diameter portion 32bt capable of closely communicating the other end 11o of the flexible tube 11.

  The third branch portion 32 has a slope in which the branch pipe portion 32b guides the drainage 43 in the flexible tube 11 to the bottom portion 4Ab of the second vertical pipe 4A. Generation | occurrence | production of the mold and off-flavor by staying can be suppressed effectively. In order to suppress the increase in the air resistance of the outside air 6 while effectively exhibiting such an action, the inclination α6a of the branch pipe portion 32b is desirably the same as the drainage gradient α1.

  The fourth branch part 33 includes a vertical pipe part 33 a and a branch pipe part 33 b, similarly to the third branch part 32. The vertical pipe portion 33a is provided with a pair of enlarged diameter portions 33at at both ends thereof.

  Further, the branch pipe portion 33b of the present embodiment protrudes from the vertical pipe portion 33a and inclines upward at a position rotated 180 degrees around the vertical axis from the branch pipe portion 32b of the third branch portion 32. Extend. This branch pipe portion 33b has an enlarged diameter portion 33bt capable of closely communicating the other end 4Bo of the supply pipe 4B.

  Such a 4th branch part 33 can bend the outside air 6 introduced into the 2nd vertical pipe 4A from the flexible tube 11 at an obtuse angle, can guide it to the supply pipe 4B, and can make air resistance small. The angle α6b formed between the vertical pipe portion 33a and the branch pipe portion 33b of the fourth branch portion 33 has the same range as the angles α5a and α5b (shown in FIG. 6) of the first and second branch portions 22 and 23. desirable.

  As shown in FIG. 1, it is desirable that the second vertical pipe 4A is provided with an opening 38 that protrudes from the ground and opens at the upper end, similarly to the first vertical pipe 3A. Such an opening 38 serves to take out the drainage accumulated in the bottom 4Ab of the second vertical pipe 4A. The opening 38 is preferably provided with a lid 39. Furthermore, a drain (not shown) for discharging moisture into the ground may be provided at the bottom 4Ab of the second vertical pipe 4A.

  As shown in FIGS. 1 and 7, the supply pipe 4B is formed in a pipe shape extending with an inner diameter equal to the inner diameter D2. The supply pipe 4B includes an inclined portion 4Ba extending from the branch pipe portion 33b of the fourth branch portion 33 toward the ground, an upward portion from the end of the inclined portion 4Ba, and an underfloor space 7 of the building H. And an outside air supply unit 4Bb opened at

  The outside air supply unit 4Bb is connected to an intake fan 41 that forcibly sucks air into an opening 45 provided at one end 4Bi thereof. Such an intake fan 41 can allow the outside air 6 to pass through by making the inside of the underground heat exchanging unit 2, the introducing unit 3, and the supplying unit 4 negative pressure.

  In the supply pipe 4B, the angle α6c formed by the inclined portion 4Ba and the outside air supply portion 4Bb is preferably set to an obtuse angle, and more preferably set to the same range as the angle α6b of the fourth branch portion 33. Is desirable. Accordingly, the supply pipe 4B can reduce the air resistance between the inclined portion 4Ba and the outside air supply portion 4Bb, and can smoothly guide the outside air 6.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Air conditioner using geothermal heat 2 Geothermal heat exchange part 11 Flexible tube

Claims (9)

It is an air conditioner using geothermal heat that exchanges outside air with geothermal heat and supplies it to the inside of the building,
Including a pipe-shaped underground heat exchange part buried in the ground and exchanging heat from the outside air with underground heat,
At least a part of the underground heat exchanging portion is made of a flexible tube that can be bent freely.   The air conditioner using geothermal heat according to claim 1, wherein the flexible tube extends in a vertical spiral shape in which a spiral axis is an up-down direction.   The air conditioner using geothermal heat according to claim 1, wherein the flexible tube extends in a zigzag shape in a vertical direction. The underground heat exchanging section includes an introduction section for introducing outside air into the flexible tube;
A supply unit for supplying outside air heat-exchanged by the flexible tube into the building,
One end of the flexible tube is connected to the introduction unit, and the other end of the flexible tube is connected to the supply unit,
The air conditioner using geothermal heat according to any one of claims 1 to 3, wherein the flexible pipe has a drainage gradient inclined downward from the one end toward the other end.   5. The use of underground heat according to claim 4, further comprising an underground support jig that supports the flexible pipe to maintain the drainage gradient in the ground and / or the separation of the adjacent flexible pipes above and below. Air conditioner. The introduction portion includes a first vertical pipe extending in the vertical direction and communicating with the one end side of the flexible tube via a first branch portion,
6. The air conditioner using geothermal heat according to claim 4, wherein the first branch portion bends outside air introduced into the first vertical pipe to an obtuse angle and guides it to the flexible tube. 7. The introduction part further includes an introduction pipe having one end opened on the ground and the other end communicated with the first vertical pipe via the second branch part,
The second branch part is provided above the first branch part,
And the said 2nd branch part bends the external air introduce | transduced from the said introductory pipe at an obtuse angle, and guides it to the said 1st branch part side, The air-conditioning apparatus of the underground heat utilization of Claim 6. The supply unit includes a second vertical pipe extending in the vertical direction,
The second vertical pipe has a third branch portion communicating with the other end side of the flexible tube,
The third branch portion is provided above the bottom of the second vertical pipe,
In addition, the third branch portion has a slope that guides the drainage in the flexible pipe to the bottom of the second vertical pipe, and uses an underground heat utilization air conditioner according to any one of claims 4 to 7. The supply unit includes a second vertical pipe extending in the vertical direction, and a supply pipe having one end opened inside the building and the other end communicated with the second vertical pipe via a fourth branch part,
The air conditioner using geothermal heat according to any one of claims 4 to 7, wherein the fourth branch portion guides the outside air introduced into the second vertical pipe to the supply pipe by bending it at an obtuse angle.

Images