KR100991002B1 - A heatexchanger for the underground - Google Patents

Abstract

PURPOSE: An underground heat exchange apparatus is provided to improve the insulation effect because an intermediate layer is formed between a recirculating fluid and a fluid. CONSTITUTION: An underground heat exchange apparatus comprises a body(301) in which a first path(330), a sectional chamber(350), and a second path(310) are arranged successively from the inner periphery to the outer periphery. A recirculating fluid flows in the first path. The second path is separated from the first path through the sectional chamber and secures the maximum thermal contact area between a fluid and the underground. One or more grouting injection spaces(370) for putting in a filler are formed on one side of the body.

Description

Underground heat exchanger {a heatexchanger for the underground}

The present invention prepares a separate filler passage while increasing the thermal insulation effect by placing an intermediate layer between the return fluid and the fluid supplied from the ground in the cooling and heating, to ensure a sufficient space for the return fluid and fluid flows in and out It relates to an underground heat exchanger.

Recently, in order to cope with high oil prices, the construction industry is actively developing alternative energy that can replace oil or natural gas as an energy source used for heating and cooling.

Among these alternative energy sources, technologies that can be applied to air-conditioning systems using wind, solar, and geothermal energy, which have infinite energy sources, are being researched. These energy sources have little effect on air pollution and climate change. While there is an advantage to obtain a low energy density has the disadvantage.

In order to obtain wind and solar energy, a large area must be secured along with the limit of the installation site. These devices have a limited energy production and cost to install and maintain.

Due to these limitations, geothermal energy, which is relatively inexpensive to install and maintain, has been proposed in cooling and heating systems.

For example, a method and installation structure of a geothermal heat exchanger of JP-A-10-2004-0045780, a heat exchanger using a hollow part of a pile of JP-A-10-2005-0034535, and a method of installing the same are proposed.

And, as shown in FIGS. 10A-2004-0045780, as shown in FIGS. 1A and 1B, a hole having a coil shape geothermal heat exchanger (100) having two free ends and a heat transfer fluid contained therein (102) ) And grouting 106 in order to prevent inflow of soil 104 and surface water into the borehole 102, and one of the two free ends of the geothermal heat exchanger 100 to the heat pump (). 108 is disclosed to recover the heat source in the ground to perform cooling or heating for each generation.

Since the geothermal heat exchanger is installed in one borehole, the construction site and construction cost can be minimized, and the geothermal heat exchanger is in the form of a coil, thereby maximizing thermal efficiency by increasing the time the heat transfer fluid stays in the ground.

However, the above structure is necessary to secure the ground with enough space to drill the borehole, and the drilling cost of the borehole is high, and the bentonite or concrete that is filled after installing the geothermal heat exchanger inside the borehole has the thermal conductivity of the grouting material. It is difficult to efficiently recover geothermal energy and is not commercialized.

In order to overcome the above problems, a method of manufacturing a pile in the field and inserting a geothermal heat exchanger is proposed. However, when manufacturing a cast-in-place pile, the hollow part is formed larger than the size of a general pile and the cross-sectional area of the pile is reduced. There is a problem in that the bearing capacity of the pile is reduced and thus structural instability occurs in transferring the load received from the foundation, which is the role of the pile, to the ground.

The latter publication 10-2005-0034535 shows a geothermal heat exchanger 202 for recovering geothermal heat in the space portion 202a of the pile 200 installed as a foundation of a building, as shown in FIG. After embedding, curing and injecting a grouting material 204 such as cement or bentonite into the inside of the pile 200, a structure for performing heating and cooling for each generation by connecting a heat pump to the geothermal heat exchanger 202 is disclosed have.

This is because the geothermal heat exchanger 202 is installed inside the pile installed for the foundation of the building, the cross-sectional area of the pile 200 is maintained as it is, it is effective to maintain the bearing capacity and structural stability of the pile.

However, since the coils of the geothermal heat exchanger are formed at regular pitch intervals, there is another problem in that the geothermal heat is not efficiently used by absorbing or releasing more surface heat than the ground.

An object of the present invention for improving the conventional problems as described above, to simplify the structure and to facilitate the construction, while simplifying the structure of the underground heat exchanger in the heat exchange hole while reducing the amount of heat medium exchanged with the underground heat exchanger It maximizes the space between the return fluid and the fluid to increase the insulation effect to minimize the heat loss, to ensure sufficient space for the return fluid and fluid inflow and outflow, and the desired depth as a separate structure Correspondingly, to provide an underground heat exchanger that is easy to transport and install.

In order to achieve the above object, the present invention provides the maximum fluid flow into the ground while being separately installed through a separate passage chamber provided at one side of the first passage and one side of the first passage in which the return fluid having the heat transfer in the cooling and heating unit is introduced. The second passage disposed to have a heat transfer area is integrally installed in the body, and provides an underground heat exchanger consisting of a configuration in which at least one grouting injection space is provided so that at least one filler is injected into one side of the body.

The present invention further includes a third space interconnecting the first passage and the second passage, and one side of the third space further includes an end cap for protecting the same.

In addition, the body of the present invention provides an underground heat exchanger having a plurality of heat transfer fins so that the second passage has a maximum contact area with the ground and an uneven portion is integrally formed on the outside thereof.

In addition, the present invention provides an underground heat exchanger, in which a plurality of bodies inserted into underground boreholes are interconnected by a joint member, and the joint member is provided with at least one recess corresponding to a grouting injection space.

As described above, according to the present invention, the construction is simplified to simplify the construction, while simplifying the structure connected to the underground heat exchanger in the heat exchanger, while maximizing the amount of the heat medium exchanged with the underground heat exchanger, the intermediate layer between the return fluid and the fluid It increases heat insulation effect to minimize heat loss, secures enough space for inflow and outflow of return fluid and fluid, and is easy to transport and install while corresponding to desired depth as separate structure.

1A and 1B are respectively a perspective view and a sectional view showing a conventional geothermal heat exchanger installed state.
2 is a cross-sectional view showing a heat exchanger using a hollow part of a conventional pile.
3 is a perspective view showing a heat exchange unit according to the present invention.
4 is an exploded state diagram of a heat exchange unit according to the present invention.
Figure 5 is a cross-sectional view of the installation state showing a heat exchange unit according to the present invention.
6A and 6B are principal part cross-sectional views respectively showing a heat exchange unit according to the present invention.
Figure 7 is a cross-sectional view of the installation state showing a heat exchange unit according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a perspective view showing a heat exchange unit according to the present invention, Figure 4 is an exploded state diagram of the heat exchange unit according to the present invention, Figure 5 is a cross-sectional view of the installation state showing a heat exchange unit according to the present invention, Figure 6a, b 7 is a sectional view showing main parts of a heat exchange unit according to the present invention, and FIG. 7 is a sectional view showing an installation state of a heat exchange unit according to another embodiment of the present invention.

The heat exchange unit 300 of the present invention may be inserted into the borehole E-1 as one, but preferably, one or more unit heat exchange units 300A and 300B are connected to each other as the joint member 400.

That is, the heat exchange unit 300, when made as one, the end induction cap 410 at the end to form a third space 307 at the end inserted into the borehole after being formed into a pipe by extrusion, such as the manufacture of the pipe The fixture 415 provided integrally is mounted integrally.

When the heat exchange unit 300 is separately installed and connected, the first passage 330 and the second passage 310 interconnect only the unit heat exchange unit 300B positioned at the bottom of the borehole E-1. Three spaces 307 are provided.

The unit heat exchange unit (300A) (300B), a separate compartment chamber provided on one side of the first passage (330) and the first passage 330 to which the heat transfer fluid is completed in the external cooling, heating unit A second passage 310 is disposed integrally with the body 301 while being disposed to have a maximum thermoelectric area with the ground as the return fluid rises in the ground while being separated through 350.

In addition, at least one grouting injection space 370 is provided at one side of the body 301 so that the filler is injected.

Further, a third space 307 is further provided to interconnect the first passage 330 and the second passage 310, and one side of the third space 307 has an end guide cap 410 protecting the same. ) Is further provided.

In addition, the body 301 is provided with a plurality of heat transfer fins 305 so that the return fluid passing through the second passage 310 has a maximum contact area with the ground (E).

At this time, it is preferable that the uneven portion (not shown) is integrally formed to increase the surface area of the outside of the body 301 or the outside of the heat transfer fin 305.

In addition, a plurality of unit heat exchange units 300A and 300B inserted into the bore hole E-1 of the ground E are interconnected by the joint member 400.

At this time, the joint member 400 is composed of one or more recesses 405 corresponding to the grouting injection space 370 is provided.

The operation of the present invention having the above configuration will be described.

As shown in Figures 2 to 7, the present invention is easy to construct a configuration in which only one heat exchange unit 300 having a pipe shape into the bore hole (E-1).

That is, the heat exchange unit 300 of the present invention, as a cooling, heating unit to heat exchange while the first passage 330 into which the return fluid is introduced after the heat exchange is made and the return fluid flows from the bottom of the ground to the top The grouting injection space 370 into which the second passage 310 and the filling material such as bentonite is injected is integrally provided in the pipe-like body 301 to construct the body 301 by inserting it into the borehole E-1. Is complete.

The heat exchange unit 300 mounted to the borehole E-1 may be manufactured in a pipe shape so as to form one body 301 corresponding to the depth of the borehole E-1, but may be manufactured, transported, or constructed. In order to facilitate the unit heat exchange unit 300A (300B) after the production is divided into a joint member 400 according to the site conditions may be constructed.

On the other hand, the heat exchange unit 300 is a cold return fluid consisting of a body 301 having a configuration in which the first passage 330 and the second passage 310 is connected through the third space 307 when manufactured in a single body Is introduced through the first passage 330 and then flows into the second passage 310 through the third space to interconnect the first and third spaces, and the return fluid is in contact with the ground. As it rises, it absorbs heat from the ground and becomes warm when it is discharged to the outside.

In addition, when the heat exchange unit 300 is divided into unit heat exchange units 300A and 300B, and then connected to the joint member 400, only the first unit heat exchange unit 300B positioned at the bottom of the borehole E-1 may be used. A third space 307 interconnecting the passages 330 and 1 and the second passage 310 is provided to move up to a desired depth so that the return fluid is raised.

At this time, the heat exchange unit 300 and the unit heat exchange unit (300A) (300B), the first passage 330 and the first passage 330 to which the heat transfer fluid is completed, the heat transfer is completed in the external cooling, heating unit The heat of the fluid which is divided through a separate compartment chamber 350 provided in the second passage to absorb the heat of the ground in the second passage is transferred to the return fluid flowing into the first passage 330, thereby lowering the absorption effect of the ground heat. Solve it.

In addition, while the first and second passages are always positioned in the correct position, the heat transfer between the two is blocked so that the heat transfer rate is always constant, thereby increasing the reliability of the product.

In this case, the second passage 310 is disposed to have the ground and the maximum thermoelectric area as the fluid rises in the ground to easily absorb the heat of the ground.

In addition, at least one grouting injection space 370 is provided on one side of the body 301 so that the filling material can be maintained quickly and easily while the grouting process is rapidly and easily maintained.

The heat exchange unit is connected to the borehole E-1 through a termination guide cap 410 provided at one side of the third space 307 which interconnects the first passage 330 and the second passage 310. During injection, the third space 307 is broken to prevent the contaminated fluid from flowing straight into the ground.

In addition, the joint member 400 to which the unit heat exchange units 300A and 300B are interconnected is provided with one or more recesses 405 corresponding to the grouting injection space 370 so that the unit heat exchange unit is always leaked in place without leakage. Will be connected.

As described above, the present invention allows the heat transfer by a fluid of a constant capacity at all times while minimizing the pollution caused by the fluid directly flowing into the ground, thereby increasing the reliability of the product.

300 ... heat exchange unit 301
305 ... heat transfer pin 330 ... first passage
350 compartment chamber 370 grouting injection space
400 ... Joint member

Claims (7)

The second passage in which the fluid is installed to have the ground and the maximum thermoelectric area while being separately installed through the first passage into which the return fluid having completed heat transfer in the cooling and heating unit and the compartment chamber provided at one side of the first passage is provided. It is integrally installed in one side of the body is provided with at least one grouting injection space for filling the filler,
The body is a pipe-shaped underground heat exchanger consisting of a configuration in which the first passage, the partition chamber, the second passage in order from the inner diameter toward the outer diameter side in order delete The underground heat exchanger of claim 1, further comprising a third space at the bottom of the body interconnecting the first passage and the second passage. The underground heat exchanger of claim 3, wherein the third space further includes a terminal induction cap at an outer side thereof. The underground heat exchanger of claim 1, wherein the body is provided with a plurality of heat transfer fins so that the second passage has a maximum contact area with the ground, and an uneven portion is formed integrally therewith. The method of claim 1, wherein the heat exchange device, each body consisting of a configuration in which the first passage, the partition chamber, the second passage is arranged in sequence from the inner diameter to the outer diameter side in a pipe shape, each body is installed in the joint member Underground heat exchanger, characterized in that interconnected by The underground heat exchanger of claim 6, wherein the joint member includes one or more recesses corresponding to grouting injection spaces.

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