JP3440331B1 - Geothermal air conditioning system - Google Patents

Abstract

An object of the present invention is to provide a geothermal air-conditioning system that is excellent in efficiency by using the thermal characteristics of air and that can keep operating costs low. SOLUTION: A water circulation path 4 having a water feed pump P interposed therebetween is provided with a first internal passage 12 of a first pipe 1 buried underground.
And a water passage 31 of the air-water heat exchanger 3 installed on the ground. While passing through the air passage 32 of the steam-water heat exchanger 3, the water passage 3
The air that has exchanged heat with the water in 1 is used for air conditioning of the building. Second internal passage 2 of second pipe 2 buried underground
1 and an air circulation path 7 including a first internal passage 12. The first internal passage 12 is rotated by the action of the water supplied to the first internal passage 12 to rotate the air suction region V and the air discharge region B.
And a screw 5 having a function of forming water and a function of diffusing water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geothermal air conditioning system capable of utilizing geothermal heat for air conditioning of buildings.

[0002]

2. Description of the Related Art Conventionally, as an air-conditioning system that uses geothermal heat with little temperature changes throughout the four seasons, water is exchanged between the interior space of underground pipes buried underground and the steam heat exchanger installed under the floor of the building. There is one that is circulated and heat is exchanged between water and air (outside air) by a steam-water heat exchanger so that the air is introduced into the interior of the building. A method is adopted in which water is stored at the bottom of the space, and the stored water is sent to a steam heat exchanger to exchange heat with air for air conditioning (see Patent Document 1).

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-116293

[0004]

However, as in the conventional method, in which water is simply stored in the underground pipe to exchange heat with the geothermal heat, water is a substance that does not easily conduct heat, and thus air conditioning is performed. There was a problem that it was difficult to improve the operating efficiency of the system. The present invention has been made under the above circumstances, and by utilizing the thermal characteristics of air, which is a substance that is more likely to conduct heat than water, it is more efficient than conventional cases and has a lower operating cost. It is an object of the present invention to provide a geothermal-use air conditioning system that can be kept to a minimum.

[0005]

In the geothermal air conditioning system according to the present invention, the first space formed by the internal space of the first pipe buried in the ground is formed in the water circulation path in which the water feeding pump is interposed. Air that includes an internal passage and a water passage of a water-water heat exchanger installed on the ground, and that exchanges heat with water in the water passage while passing through the air passage of the water-water heat exchanger. In a geothermal air-conditioning system adapted to utilize air to a building, an air circulation path including a second internal passage formed by an internal space of a second pipe buried in the ground and the first internal passage. It was added and multi to the first internal passage
A stepped screw is concentrically arranged and its screw
Uppermost blade is fed to the first internal passage and
The collision energy of water that has dropped through the first internal passage is eccentric.
The screw rotates by receiving at
Through, the screw passes through the air circulation path
The suction area of the air to be transferred in the first internal passage.
Formed on the upper part of the room and the air discharge area is
It is adapted to exert a function of forming the lower portion of the screw, and a function to perform the gas-liquid contact with the water is diffused in the the first inner passage within 1 internal passage.

According to the present invention, the disk which is concentrically arranged in the first internal passage of the first pipe by the water feeding pump.
Liu is fed to the first internal passage and is fed to the first internal passage.
The collision energy of the water falling through the passage is adjusted to the bias of the uppermost blade.
It rotates by receiving it at the heart, and through that rotation,
The screw causes the air circulation path to flow through the first internal passage.
Since the suction area and the discharge area of the air passing through the passage are formed , the air in the air circulation passage passes from the suction area of the first internal passage toward the discharge area without requiring other power. To do. Moreover, since the screw has a function of making gas-liquid contact in the first internal passage, the water droplets diffused by the screw absorb the geothermal heat in the first internal passage existing in the ground and , Efficiently contacts the air passing through the first internal passage, and the air and the water droplets diffused in the first internal passage directly contact each other to perform heat exchange. Moreover, since air has a higher thermal conductivity than water, the air passing through the second internal passage of the second pipe buried in the ground exchanges heat with the geothermal heat in a short time, and such heat exchange is performed. The air subjected to the above is sucked into the first internal passage as described above and directly contacts the diffusion water. Therefore, the water introduced from the first internal passage to the water passage of the steam water heat exchanger is closer to the geothermal heat than when the water is not in contact with the air in the air circulation passage in the first internal passage. While the temperature is high and such water flows through the water passage of the steam heat exchanger, the air flowing through the air passage of the steam heat exchanger exchanges heat with the water and is used for air conditioning of the building. Will be done.

As described above, the geothermal air conditioning system according to the present invention uses air, which is superior in heat conduction as compared with water, as the heat medium for recovering geothermal heat. More efficient air conditioning becomes possible compared to the one used as the heat medium of. Moreover, the air used as the heat medium for recovering the geothermal heat is circulated in the first internal passage.
Forming a suction area and a discharge area for the air passing through the passage
Since it is designed to circulate in the air circulation path by the function of the screw , it has an advantage that it is not necessary to separately use a blower or the like for circulating the air.

In the present invention , the water circulation path and the air circulation path are entirely cut off from the outside.
It is formed as a closed circuit, and the first internal passage is
It is desirable that they are shared and communicate with each other through the first internal passage . According to this, since dust particles do not enter the water circulation path or the air circulation path from the outside, those paths do not become narrowed or clogged due to the attachment or accumulation of dust particles, which facilitates maintenance. The operating cost can be kept low.

In the present invention, the outer peripheral portion of the rotation locus of the screw is close to the inner peripheral surface of the first pipe, and the outer peripheral portion of the rotation trajectory is diffused by the screw and adheres to the inner peripheral surface. It is desirable that it is designed to come into contact with the water film formed by. According to this, the back flow of the air passing from the suction area to the discharge area in the first internal passage formed by the rotation of the screw is blocked by the water film, and further, the air flows from the suction area to the discharge area. Since the generated air and the diffused water are agitated by the rotation of the screw, the air and the water are in direct contact with each other efficiently. As a result, air will be entrained in the water or will be dissolved in the water and accumulated at the bottom of the first pipe, so that the water introduced into the water passage of the steam heat exchanger will further increase the geothermal heat. Efficiently collected, the geothermal heat can be efficiently transferred to the air for air conditioning in the steam heat exchanger.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing a main part of an embodiment of a geothermal air conditioning system according to the present invention, and FIG.
3 is a detailed view showing a part of FIG. 3, FIG. 3 is a horizontal cross-sectional view when the first pipe 1 is cut at a screw installation location, and FIG. 4 is a schematic explanatory view of the steam heat exchanger 3.

In FIG. 1, F indicates a building floor and G indicates a ground line. In the ground, a material excellent in rust resistance and thermal conductivity, for example, a stainless steel pipe having a length of about 10 m is used. The 1st pipe 1 and the 2nd pipe 2 are buried vertically, and the burial depth thereof is such that the geothermal temperature becomes a constant temperature of about 17 ° C. throughout the four seasons, for example, 5
It is buried at a depth of about 13m. On the other hand, the steam heat exchanger 3 is installed under the floor above the ground.

The first internal passage 12 formed by the internal space of the first pipe 1 and the water passage 31 of the steam heat exchanger 3.
And are included in the water circulation path 4. That is, in the water circulation path 4, the water feed pump P is interposed and the outward path 41 from the bottom outlet of the first pipe 1 to the inlet of the water passage 31 of the water-water heat exchanger 3, the water passage 31, and the air passage 31 Return path 4 from the outlet of the water passage 31 of the water heat exchanger 3 to the top inlet of the first pipe
2 and the first internal passage 12 of the first pipe 1, the pipe forming the forward path 41 and the return path 42 is provided with a heat insulating measure.

A multi-stage type screw 5 is concentrically arranged in the first internal passage 12. As shown in FIG. 1 or 2, the screw 5 has blades 54 in multiple stages at a plurality of axial positions of a rotating shaft 51 rotatably vertically supported by bearings 52, 53 attached to the first pipe 1. Fixed. Then, as shown in FIG.
The outer peripheral portion of the rotation locus of is close to the inner peripheral surface 11 of the first pipe 1, and when the blade 54 rotates, the outer peripheral portion of the rotation trajectory of the blade 54 flows down along the inner peripheral surface of the first pipe 1. It comes in contact with the water film. In addition, as can be inferred from FIG. 3, the blades 54 of each stage are formed by a plurality of blade plates fixed to the rotating shaft 51 and provided with a constant inclination angle.

As shown in FIG. 2, a water reservoir 13 is installed above the inner space of the first pipe 1, and the end 44 of the return path 42 faces the water reservoir 13. Further, the water reservoir 13 is provided with a water supply pipe 15 whose lower end faces the eccentric part of the uppermost blade 54 of the screw 5,
The water overflowing the overflow weir 14 provided in the water reservoir 13 flows down the water supply pipe 15 and falls to the eccentric portion of the uppermost blade 54 of the screw 5. And
This screw 5 is provided with the uppermost blade 54 from the water supply pipe 15.
Not only exerts the function of receiving the collision energy of the water that has fallen to the eccentric part and rotating, and repelling the water that falls from the water supply pipe 15 to diffuse it into fine water droplets. In the first pipe 1, an air suction area V is formed above the screw 5, and in the first pipe 1, an air discharge area B is formed below the screw 5.

Further, as shown in FIG. 1 or 2, a water pool 16 is provided at the bottom of the first pipe 1, and water droplets diffused into fine water droplets by the multi-stage screw 5 absorb geothermal heat, The water is collected in the water pool 16. Here, the depth of the water accumulated in the water reservoir 16 (the depth from the water surface W1 to the bottom surface of the first pipe 1) is set to about 8 m, and the length from the top of the first pipe 1 to the water surface W1 is about. It is set at 2m. Then, if the water depth of the water pool portion 16 due to the water droplets absorbing the geothermal heat is set to a depth of about 8 m, the water stored in the water pool portion 16 will further sufficiently recover the surrounding geothermal heat. Further, the lower end of the pipe forming the outward path 41 of the water circulation path 4 opens laterally at the bottom of the water pool 16 as shown in FIG. Therefore, when the pump P is operated, the water collected in the water pool 16 to recover the geothermal heat is sucked up from the opening 45 to the outward path 41, and the water passage 3 of the steam heat exchanger 3 is drawn.
Introduced in 1.

Therefore, as shown in FIG. 1, the outside air introduction passage 61 and the outside air discharge passage 6 are provided in the air passage 32 of the steam heat exchanger 3.
2 to connect the outside air discharge path 62 to the inside of the wall of the building or the attic,
When the air is introduced into the room or the like, the outside air introduced into the air passage 32 from the outside air introduction passage 61 exchanges heat with the water flowing through the water passage 31 while passing through the air passage 32, and the outside air discharge passage 6
After going through 2, the air conditioning is performed by being guided into the walls of the building, the attic, and the room.

However, since water is a substance which does not easily conduct heat, as described above, the multi-stage screw 5 absorbs the geothermal heat by the water droplets that have been made into fine water droplets and diffused, or has a water depth of about 8 m. Even if the heat of the heat exchanger 3 is used to exchange heat between the outside air and water by collecting the geothermal heat with the water in the water pool portion 16 of the water storage portion 16, the water is guided to the inside of the wall of the building, the attic, or the room through the outside air discharge path 62. It is not easy to control the outside air to a temperature that allows satisfactory air conditioning.
On the other hand, it is conceivable that water is accumulated in the water pool portion 16 for a long time to sufficiently recover the geothermal heat. However, if this is done, the amount of water circulating in the water circulation path 4 will be reduced and the steam heat exchanger will be reduced. The geothermal heat recovery efficiency due to outside air in No. 3 is reduced, and satisfactory air conditioning cannot be performed.

Therefore, in this embodiment, the air circulation path 7 including the second internal passage 21 and the first internal passage 12 formed by the internal space of the second pipe 2 buried in the ground is added. There is. That is, in this embodiment, attention is paid to the fact that air has a heat characteristic of recovering geothermal heat in a short time by heat conduction as compared with water, and by utilizing such a heat characteristic of air, the first pipe 1 The water inside is designed to recover the geothermal heat in a short time.

As shown in FIG. 1 or 2, the air circulation path 7
Is an outward path 71 from the bottom outlet in the second pipe 2 to the top inlet of the first pipe 1, the first internal passage 12 formed by the internal space of the first pipe 1, and the first internal passage 12 thereof. It includes a return path 72 from the end outlet of the second pipe to the top inlet of the second pipe 2 and a second internal passage 21 formed by the internal space of the second pipe 2. And
In the air circulation path 7, air circulates by the function of forming the suction area V and the discharge area B exhibited by the screw 5 described above.

Therefore, only by operating the pump P interposed in the water circulation path 4, the air circulates in the air circulation path 7 without requiring any other power. When the air passes from the suction area V of the first internal passage 12 toward the discharge area B, the water diffused into fine water droplets by the screw 5 directly contacts the air efficiently and performs heat exchange. In this case, since the air is a substance that easily conducts heat, the temperature of the air becomes almost the same as that of the geothermal heat by passing through the second internal passage 21 of the second pipe 2. Therefore, due to heat exchange due to direct contact between the air and the diffused water in the first internal passage 12, the geothermal heat recovered by the air is transferred to the water, and the water recovers the geothermal heat in a short time.
Therefore, in the steam heat exchanger 3, the geothermal heat recovered by water is transferred to the outside air, and the outside air reaches a temperature at which satisfactory air conditioning can be performed.

In particular, in this embodiment, as described above, the outer peripheral portion of the rotation locus of the screw 5 is close to the inner peripheral surface 11 of the first pipe 1, and the outer peripheral portion of the rotation locus is diffused by the screw 5. Since it comes into contact with the water film formed by adhering to the inner peripheral surface 11, the backflow of air passing from the suction area V in the first internal passage 12 toward the discharge area B is generated. Since the air, which is blocked by the water film and passes through the suction area V toward the discharge area B and the diffused water, are agitated by the rotation of the screw 5, the air and the water come into direct direct contact with each other efficiently. Like Therefore, a situation occurs in which air is entrained in water or dissolves in the water and accumulates in the water pool portion 16 of the first pipe 1, whereby the geothermal heat recovered by the air is transferred to the water more efficiently. Become.

In this embodiment, the water circulation path
In the above air circulation paths, the entire paths are shielded from the outside.
It is formed as a closed circuit, and the inside of the first
The partial passages are shared and the first internal passages communicate with each other. Therefore, the water circulation path 4 and the air circulation path 7 have their respective paths.
Dust will not enter from the outside of the passages 4 and 7, and the passages 4 and 7 will not be narrowed or clogged due to attachment or accumulation of dust, so maintenance will be easier and operating costs will be kept low. To be

In this embodiment, as the steam-water heat exchanger 3, as shown in FIG. 4, the water passage 31 is formed by a spiral pipe, and the air passage 32 through which the outside air passes is formed on the outer side thereof. The specific configuration of the steam heat exchanger 3 is not limited to the example shown in the figure.

The capacities of the first pipe 1 and the second pipe 2 should be selected in consideration of the size of the building to be air-conditioned and the size of the site. For example, when air conditioning a large building of 100 tsubo or more, the first pipe 1
The capacity of the
When the building is small, it is desired that the capacity of the first pipe 1 be reduced correspondingly. When it is necessary to increase the capacity of the first pipe 1, it is not preferable to increase the diameter of one first pipe 1 in terms of geothermal recovery efficiency. So, for example, as shown in Figure 5,
A water circulation path 4 in which two or a required number of the first pipes 1 are embedded in the ground in parallel and are connected to the respective first pipes 1.
The forward path 41 and the return path 42, and the forward path 71 and the return path 72 of the air circulation path 7 are connected in parallel. Thus, the water circulation paths 4 connected to the respective first pipes 1
When the forward path 41 and the return path 42 are connected in parallel, the speed of the water flow of water becomes slow. For example, in the case of FIG.
Since the number of the first pipes 1 is increased by one, the water flow velocity is halved, and if the number of the first pipes 1 is increased by four to make a total of five, the water flow velocity is ⅕, which is the efficiency. Good geothermal recovery can be performed. In addition, if the first pipes 1 are embedded in the ground in parallel and the forward path 41 and the return path 42 of the water circulation path 4 connected to each of the first pipes 1 are connected in parallel, the first pipe 1 is formed. It is possible to increase the overall capacity of the first pipe 1 while keeping the diameter of the first pipe 1 small and to efficiently recover the geothermal heat. In FIG. 5, elements that are the same as or correspond to the elements described in FIG. 1 are assigned the same reference numerals to avoid duplication of description.

[0025]

As described above, according to the geothermal air-conditioning system of the present invention, by utilizing the thermal characteristics of air, which is a substance that is more likely to conduct heat than water, it is more efficient than the conventional case. It becomes possible to provide an air conditioning system using geothermal heat which is excellent and whose operation cost can be kept low.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part of an embodiment of a geothermal air conditioning system according to the present invention.

FIG. 2 is an explanatory diagram showing a part of FIG. 1 in detail.

FIG. 3 is a horizontal cross-sectional view when the first pipe is cut at a screw installation location.

FIG. 4 is a schematic explanatory view of a steam heat exchanger.

FIG. 5 is an explanatory diagram showing a main part of a geothermal air conditioning system according to a modification.

[Explanation of symbols]

P water feeding pump 1 first pipe 2 Second pipe 3 steam heat exchanger 4 water circulation routes 5 screws 7 Air circulation path 11 Inner peripheral surface of the 1st pipe 12 First internal passage 21 Second internal passage 31 water passage 32 air passage

─────────────────────────────────────────────────── --Continued from the front page (56) References JP 2002-13829 (JP, A) JP 5-118700 (JP, A) Actually opened 58-158232 (JP, U) Actually opened 57-91031 (JP, U) U.S.A. 57-43137 (JP, U) U.S. Pat. No. 4-366372 (JP, U) U.S. Pat. No. 1-14862 (JP, Y2) U.S. Pat. No. 4,171,721 (US, A) U.S. Pat. (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 5/00 101 F24J 3/08

Claims (3)

(57) [Claims] 1. A water / water heat exchange installed on the ground and a first internal passage formed by an internal space of a first pipe vertically embedded in the ground in a water circulation path in which a water feeding pump is interposed. The water passage of the water heater is included, and the air that has exchanged heat with the water in the water passage while passing through the air passage of the steam heat exchanger is used for air conditioning of the building. In the geothermal air conditioning system, an air circulation path including a second internal passage formed by an internal space of a second pipe vertically embedded in the ground and the first internal passage is added to the first internal passage. Multi-stage screws are concentrically deployed
And the uppermost blade of the screw is the first inside
Collision of water delivered to the passage and falling through the first internal passage
By receiving energy at an eccentric location, the screw
, The screw rotates, and the screw moves upward through the rotation.
Note that the suction area of the air passing through the air circulation path is within the first
Formed in the upper part of the screw in the part passage, and
The air discharge area is located below the screw in the first internal passage.
And the function to form in the first internal passage by diffusing the water.
It has the function of making gas-liquid contact in the road .
An air conditioning system using geothermal that is characterized by 2. The water circulation path and the air circulation path are
The entire path is formed as a closed circuit that is cut off from the outside.
It is shared with the first internal passage
The geothermal air conditioning system according to claim 1, wherein the air conditioning systems communicate with each other through a passage . 3. The outer peripheral portion of the rotation locus of the screw is close to the inner peripheral surface of the first pipe, and the outer peripheral portion of the rotation trajectory is diffused by the screw and attached to the inner peripheral surface. The geothermal heat-utilizing air-conditioning system according to claim 1 or 2, which is adapted to come into contact with a water film to be formed.