JP2016211790A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system capable of effectively using thermal energy which exists in underground water.SOLUTION: A heat exchange system comprises a circulation pipe for circulating fluid, which is connected to a device using heat and is arranged from the ground surface towards the underground, a casing which is arranged from the ground surface towards the underground and communicates at a side part with an aquifer in the underground, and a water conduit pipe which is arranged between the circulation pipe and the casing while forming predetermined distances from the circulation pipe and the casing, respectively. The water conduit pipe is arranged to the vicinity of the lower end part of the circulation pipe, has a water conduit opening on the lower side, and has a water pump means for pumping up water from the inside of the water conduit pipe.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange system using groundwater, and more particularly to a heat exchange system that can be installed regardless of the depth of the groundwater aquifer.

Utilizing a relatively stable temperature of groundwater, it is used as a heat source or a cold heat source in a relative temperature relationship with the equipment to be used.
For example, Patent Document 1 discloses a technique in which a U-shaped circulation pipe is disposed in a cylindrical body into which water has entered from an underground aquifer.
However, aquifers that are groundwater drainage sources that exist in the ground differ depending on the strata structure, and the depth varies depending on the region, such as 50-100 m in depth.
Therefore, if the lower end of the opening of the cylinder is matched to the depth of the aquifer as disclosed in Patent Document 1, the length (depth) of the cylinder must be changed depending on the installation location.
In addition, when the cylindrical body 111 is provided so as to cross the aquifer 111a as shown in FIG. 4, a U-shaped circulation pipe 113 is disposed in this cylindrical body, and the pump controlled by the control unit 110 114 will be pumped up.
Then, the flow of water was only H ₀ between the aquifer 111a and the pumping port 114a, and heat utilization of groundwater was insufficient.

Japanese Patent No. 5067956

  An object of this invention is to provide the heat exchange system which can utilize effectively the thermal energy which groundwater has.

The heat exchanging system according to the present invention is connected to a device that uses heat, and is arranged to circulate a fluid arranged from the ground surface toward the ground, and from the ground surface toward the ground, A casing communicated with the aquifer at the side portion, and a conduit pipe disposed between the circulation pipe and the casing and with a predetermined interval between the circulation pipe and the casing. The water guide pipe is disposed up to the vicinity of the lower end of the circulation pipe, has a water inlet on the lower side, and has a pumping means for pumping water from the inside of the water pipe. .
Here, the device using heat refers to various devices that are directly connected to a circulation pipe or indirectly connected through a heat exchanger.
For example, the form which couple | bonds with outdoor units, such as an air conditioner, and utilizes groundwater as cold or warm heat is mentioned as an example.
In this way, when water is pumped up from the upper part of the conduit, for example, the groundwater flowing out from the underground aquifer flows upward through the conduit at the bottom of the conduit. Therefore, the heat of groundwater can be used without being affected by the depth of the aquifer.

In the present invention, the casing may use an existing well, or a new casing may be installed in the ground.
The outer periphery of the casing may have any structure as long as it can communicate with the underground aquifer.
For example, the example which provides a slit and a hole in the outer peripheral part of a casing, or makes it a mesh structure is mentioned.

  Insufficient amount of water from the aquifer, or in case of drought such as winter season, have water injection means to pump groundwater from other existing wells and inject water from the top of the conduit or / and from the top of the casing It may be.

  In the present invention, a conventional U-shaped tube pipe may be used as the circulation pipe, and the circulation pipe may have a double pipe structure in which an inflow portion and an outflow portion are arranged concentrically.

In the heat exchange system according to the present invention, since the conduit pipe is provided between the casing portion communicating with the underground aquifer, that is, the casing portion in which the ground water accumulates and the circulation pipe for heat exchange, the ground water is provided at the lower portion of the conduit pipe. A water flow is formed so that water flows into or out of the water conduit from the provided water inlet.
Thereby, it becomes a system which can exchange heat irrespective of the depth of the underground aquifer.

The structural example of the heat exchange system which concerns on this invention is shown. (A) shows the case where water is pumped from the upper part of the water conduit, and (b) shows the case where water is poured. An example in which the circulation pipe has a concentric double structure is shown. An example of a combination of pumping means and water injection means will be shown. An example of a conventional heat exchange system is shown.

  Although the structural example of the heat exchange system which concerns on this invention is demonstrated based on drawing below, this invention is not limited to this.

FIG. 1A shows a basic configuration.
A casing 11 made of, for example, an iron pipe is buried in the underground 1.
The casing 11 is formed with an aquifer portion 11a composed of a slit-like communicating portion corresponding to the position of the aquifer in the ground.
A resin-made water conduit 12 is arranged in a state where a predetermined interval is provided between the inner peripheral wall and the inner peripheral wall and is slightly lifted from the bottom surface.
The water guide pipe 12 has a water inlet 12a having a lower opening, and a U-shaped circulation pipe 13 is inserted and arranged from the top.
The circulation pipe 13 is connected to, for example, an outdoor unit of an air conditioner, and one is a heat medium inlet 13a and the other is an outlet 13b.
When the suction pump 14 side of the pump 14 is arranged in the upper part of the water conduit 12 and pumped out to the discharge 14 b side, the groundwater that has entered from the aquifer 11 a passes through the water inlet 12 a below the water conduit 12. Since the water is pumped up, heat exchange with the circulation pipe is performed over substantially the entire length of the water guide pipe 12.
In this case, when the amount of water that springs out from the aquifer is small, groundwater may be pumped up from an existing well or the like and injected from the upper part of the casing 11 through the water injection pipe 15.
A flow meter 15 b and a valve 15 a are attached to the water injection pipe 15.
Although not shown, a temperature sensor is provided in the casing, the water conduit, and the like, and a control unit that controls the operation of valves, pumps, and the like based on the data is provided.
In addition, if the amount of continuous heat collection was measured in the state where the water conduit 12 shown in FIG. 1A was removed, when the introduction tube 12 was attached in an environment where the level was 15 kW, the level improved to about 30 times the 30 kW level.

  FIG. 1B shows an example in which groundwater is pumped from another existing well and poured from the upper part of the water conduit 12 in the drought season.

The example shown in FIG. 2 is an example in which a double pipe 23 is used as a circulation pipe, and an enlarged view of the lower end portion is shown in FIG.
The double pipe 23 is made of SUS or the like, and has a double structure with the outer pipe 23a concentrically arranged at a predetermined interval around the outer circumference of the inner pipe 23b.
Since the lower end portion of the outer tube 23a is closed and the lower end portion of the inner tube 23b is opened, the inner tube 23b and the outer tube 23a communicate with each other through this portion.
FIG. 3 shows an example in which a temperature sensor T3 is provided in this communication portion.
The example shown in FIG. 3 schematically shows a water flow meter Q1 and a valve system, a pumping system flow meter Q2 and a valve system, and controls the control unit S based on measurement data D1, D2, etc. Is provided.
In addition, the water injection pipe 15 is branched into a casing part 15c and a water guide pipe part 15d.

DESCRIPTION OF SYMBOLS 1 Underground 11 Casing 11a Aquifer 12 Water transfer pipe 12a Water transfer port 13 Circulation pipe 14 Pumping pump 15 Water injection pipe

Claims (3)

A circulation pipe that is connected to a device that uses heat and circulates a fluid arranged from the ground surface toward the ground;
A casing arranged from the surface of the earth toward the ground, and in communication with the underground aquifer at the side,
A conduit pipe disposed between the circulation pipe and the casing, and arranged with a predetermined interval between the circulation pipe and the casing, and
The water conduit is disposed up to the vicinity of the lower end of the circulation pipe and has a water inlet on the lower side,
A heat exchanging system comprising pumping means for pumping water from the inside of the water conduit.   The heat exchange system according to claim 1, further comprising water injection means inside the water conduit or / and the casing.   The heat exchange system according to claim 1 or 2, wherein the circulation pipe has a double pipe structure in which an inflow portion and an outflow portion are arranged concentrically.

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