KR20140040561A - Geothermal exchanger - Google Patents

Abstract

The present invention relates to a geothermal exchanger for geothermal cooling and heating, which comprises: a heat exchange pipe (10) which is inserted into a bore hole (B) formed on the stratum, and is composed of an inlet (11) for the inflow of a heating medium, an outlet (12) for the outflow of the heating medium, and a connection pipe (13) for connecting the inlet (11) and the outlet (12); and a spacer (40) which maintains an interval between the inlet (11) and the outlet (12) consistently, and is composed of a first and a second spacer body (41, 42) whose one end (40a) is connected with each other in a symmetric shape, a first and a second half-groove (41a, 41b) formed on the first spacer body (41) at an interval for inserting a first inlet (11) and the outlet (12) respectively, a third and a fourth half-groove (42a, 42b) formed on the second spacer body (42) at an interval in a symmetric shape to the first and second half-grooves (41a, 41b) for inserting the inlet (11) and the outlet (12) respectively, and a first loop end (43) formed on the other end of the first spacer body (41) for being hung on the other end (40b) of the second spacer body (42).

Description

Geothermal exchanger for geothermal heating and cooling

The present invention relates to a geothermal heat exchanger for geothermal cooling and heating, which can be easily installed in deeply formed boreholes and maximizes geothermal heat and heat exchange efficiency.

In general, fossil fuels such as coal, petroleum and natural gas are used as energy sources for domestic and industrial use. These fossil fuels are rapidly increasing in cost due to depletion of the reserves, and various pollutants Polluting water quality and the atmospheric environment. Due to these problems, the development of environmentally friendly alternative energy capable of replacing fossil fuels has been actively carried out in recent years.

These alternative energy sources are solar, wind, tidal, and geothermal. In the case of a heating / cooling system utilizing dual geothermal heat, it is possible to save energy of up to 40% or more compared with the conventional heating / cooling system, and stable operation can be achieved without deteriorating the cooling / heating performance due to the geothermal characteristic that maintains a constant temperature during the year.

1 is a view for explaining a state in which a conventional geothermal heat exchanger for cooling and heating is inserted into a bore hole.

In general, the geothermal heat exchanger for geothermal cooling and heating is connected to a heat pump for cooling and heating. The geothermal exchanger includes an inlet pipe 1 through which a heating medium flows, an outlet pipe 2 through which a heating medium flows, And a connecting portion 3 connecting the outlet 1 and the outlet 2 in a U-band form. The geothermal exchanger is installed by filling the borehole (B) with a heat-conductive grout material (G) after inserting it into boreholes (B) drilled at a depth of about 50 to 200 m in the vertical direction of the stratum.

The geothermal heat exchanger performs heat exchange with the geothermal heat transferred through the grout material G in the process of circulating the heating medium at a predetermined temperature flowing into the inlet pipe 1 through the connecting pipe 3 and the outlet pipe 2 , Heat of the heat-exchanged heat medium is heat-exchanged again in a heat pump (not shown) and used for cooling and heating.

However, in the geothermal exchanger of the above-described type, the inflow pipe 1 and the outflow pipe 2 are made of a PE material and are rolled in the form of rolls, so that they are bent to one side when expanded. It was very difficult to cut into the borehole B formed.

The inlet pipe 1 and the outlet pipe 2 inserted into the borehole B often have irregular or twisted shapes because the depth of the borehole B reaches 50 to 200 m. In this case, the heat-conductive grout G was not sufficiently filled in the borehole B during the grouting, and the gap A formed at the twisted portion interfered with the heat exchange of the geothermal heat.

In addition, when the inflow pipe 1 and the inflow pipe 2 are twisted, thermal interference occurs between the inflow pipe 1 and the inflow pipe 2, and consequently, the thermal interference between the inflow pipe 1 and the outflow pipe 2 And the heat exchange efficiency of the geothermal heat is reduced because the temperature difference of the heating medium is reduced.

In addition, the grouting operation can not be performed rapidly by the inflow pipe (1) and the outflow pipe (2) which are twisted in an irregular shape. In this case, the bentonite used as the grout material (G) is inflated or hardened, and the grouting work is interrupted as a result of blocking the piping and the pump of the grout re-input equipment. As a result, the work time is increased, And the cost of the geothermal heat is added as a whole.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a geothermal heat exchanger for geothermal cooling and heating that can quickly insert an inlet pipe and an outlet pipe into a borehole having a depth of several hundred meters, .

Another object of the present invention is to prevent the generation of air gap during grouting by inserting the inflow pipe and the outflow pipe at regular intervals in the borehole, to eliminate heat interference, and to maximize the temperature difference between the inflow pipe and the outflow pipe And to provide a geothermal heat exchanger for geothermal cooling and heating that can maximize heat exchange efficiency.

In order to achieve the above object, a geothermal heat exchanger for geothermal cooling and heating according to the present invention comprises: an inflow pipe (11) which is inserted into a borehole (B) formed in a stratum and into which a heating medium flows, 12), a heat exchange pipe (10) composed of a connection pipe (13) connecting the inflow pipe (11) and the outflow pipe (12) And maintaining a constant gap between the inflow pipe 11 and the outflow pipe 12, the first and second spacer bodies 41 and 42 having a symmetrical shape to which one side end 40a is connected. The first and second half grooves 41a and 41b, which are formed to be spaced apart from the first spacer body 41, into which the first inlet pipe 11 and the outlet pipe 12 are fitted, respectively, and the second spacer body 42. Third and fourth half grooves 42a and 42b which are formed to be spaced apart from each other and are formed to be symmetrical with the first and second half grooves 41a and 41b to which the inlet pipe 11 and the outlet pipe 12 are fitted, respectively; A spacer (40) formed at the other end of the first spacer body (41) and having a first ring end (43) hooked to the other end (40b) of the second spacer body (42). It is done.

In the present invention, it further comprises a fitting connecting portion (20) installed in the connecting pipe (13), and a weight (30) connected to the fitting connecting portion (20); The fitting connector 20 is formed along the one end of the fitting connector body 21 and the U groove 21a in which the connector tube 13 is inserted, and the connector tube 13 ) And an interference fitting end 22 extending to fit the U groove 21a and a bolt end 23 screwed to the screw hole 30a formed in the weight 30. At this time, the weight 30, the horn-shaped horn tip portion 31 formed on the tip.

The present invention further includes a bottom arrival signal generator 50 installed in the weight 30 and generating a bottom arrival signal when the weight 30 is closed at the bottom of the borehole B .

In the present invention, the spacer 40 includes a second spacer 41b between the first spacer body 41 or the third and fourth half-grooves 42a and 42b between the first and second half-grooves 41a and 41b, A second ring end (44) formed on any one of the body (42); And the second spacer body 42 between the first spacer body 41 or the third and fourth half grooves 42a and 42b between the first and second half grooves 41a and 41b And an annular groove 45 on which the second ring end 44 is hooked. In order to prevent the inflow pipe 11 and the inflow pipe 12 from moving in the first and second half grooves 41a and 41b and the third and fourth half grooves 42a and 42b, And a friction layer 46 which is in close contact with the surface of the outflow pipe 12 are formed.

According to the present invention, it is possible to quickly insert the inlet pipe and the outlet pipe into the boreholes having a depth of several hundred meters by connecting the weights to which the weight is applied, thereby preventing the pipes and pumps of the grout recharging equipment from being clogged As a result, the working time can be shortened and the geothermal cost can be reduced overall.

Also, it is possible to insert the heat exchanger tube into the bore hole with the interval between the inlet pipe and the outlet pipe being constant by using the spacer, thereby eliminating the occurrence of pores in the grouting and eliminating thermal interference, It is possible to maximize the heat exchange efficiency of the geothermal heat.

1 is a view for explaining a state in which a conventional geothermal heat exchanger for geothermal cooling and heating is inserted into a bore hole,
2 is a view for explaining a state in which a geothermal heat exchanger for geothermal cooling and heating according to the present invention is inserted into a bore;
FIG. 3 is a view for explaining the configuration by extracting the geothermal heat exchanger of FIG. 2,
Fig. 4 is an exploded perspective view of the insert heat fitting shown in Fig. 3,
Fig. 5 is an exploded perspective view of the spacer of Fig. 3,
6 is a view for explaining a friction layer formed on the first, second, third,
FIG. 7 is a view for explaining a floor arrival signal generator installed in the weight of FIG. 3;
FIG. 8 is a view for explaining the provision of spacers in a state where heat exchange tubes are arranged in a straight line in the geothermal heat exchanger of FIG. 2; FIG.

Hereinafter, a geothermal heat exchanger for geothermal cooling and heating according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view for explaining a state in which the geothermal heat exchanger for geothermal cooling and heating according to the present invention is inserted into the bore, and FIG. 3 is a diagram for explaining the configuration by extracting the geothermal heat exchanger of FIG.

As shown in the figure, the geothermal heat exchanger for geothermal cooling and heating according to the present invention includes an inflow pipe 11, which is inserted into boreholes B drilled at a depth of about 50 to 200 m in the vertical direction of the bed, An outlet pipe 12 through which the heating medium flows out and a connection pipe 13 connecting the inlet pipe 11 and the outlet pipe 12; (20) installed in the connection pipe (13); A weight 30 connected to the fitting connection portion 20; A spacer (40) which keeps a constant distance between the inlet pipe (11) and the outlet pipe (12); And a bottom arrival signal generator 50 for generating a bottom arrival signal when the weight 30 is closed at the bottom of the borehole.

The heat exchange pipe 10 is connected to a heat pump (not shown), and the inlet pipe 11 and the outlet pipe 12 are connected in a U-band manner by the connecting pipe 3. This heat exchange tube 10 is made of PE material, and is circulated in the form of being wound on a roll to be used in a loose state.

Fig. 4 is an exploded perspective view of the insert heat fitting of Fig. 3;

As shown in the figure, the fitting connection portion 20 is provided to prevent the connection pipe 13 from being pressed by an external pressure. The fitting connection portion 20 includes a U-shaped groove 21a into which the connecting pipe 13 is inserted, An interference fit end 22 formed along one end of the U groove 21a and extended so as to insert the connection pipe 13 into the U groove 21a and a screw hole 30a formed in the weight 30 (Not shown). It is needless to say that the sub-clamping end 24 may be formed in the U-shaped groove 21a on the opposite side of the clamping end 22.

The connection pipe 13 is slightly flattened by the force fitting end 22 and the sub force fitting end 24 when the connection pipe 13 is strongly pushed into the U groove 21a, It is compromised. Therefore, once it is inserted into the U-shaped groove 21a, it can not be removed again.

The fitting connection portion 20 is made of a metal material so as to have sufficient durability, and thus prevents the connection pipe 13 from being pressed by the pressure applied from the outside. Also, since the fitting connection portion 20 is made of a metal material, the bolt end 23 can be welded and connected.

The weights 30 are applied to the connection tube 13 of the heat exchange tube 10 so as to be easily inserted into the bore holes B. [ The weight 30 has various weights according to the diameter and depth of the borehole B. For example, when the diameter of the borehole B is 20 cm and the depth is 200 m, the weight 30 has a weight of 20 Kg.

When the weight 30 is inserted into the bore hole B by the horn tip 31, the tip end of the weight 30 has a horn-shaped horn-tip end 31. When the weight 30 is inserted into the bore hole B, And the inner wall of the bore hole B is prevented from being damaged.

FIG. 5 is an exploded perspective view of the spacer of FIG. 3, and FIG. 6 is a view for explaining a friction layer formed on the first, second, third and fourth half-grooves of FIG.

As shown in the figure, the spacer 40 is made by injection molding a plastic resin so that the interval between the inflow pipe 11 and the outflow pipe 12 within the bore hole B is constant. The spacer 40 has symmetrical first and second spacer bodies 41 and 42 connected to one end 40a of the first spacer body 41. The spacer 40 is spaced apart from the first spacer body 41 and has an inlet pipe 11, The first and second half slots 41a and 41b are formed to be spaced apart from the second spacer body 42 and are symmetrical with the first and second half slots 41a and 41b The second and third spacer grooves 42a and 42b are formed on the other side of the first spacer body 41 and the second spacer body 42 is formed on the other side of the first spacer body 41, And a first ring end 43 which is hooked to the other end 40b.

The spacer 40 may be formed of any one of the first spacer body 41 between the first and second half grooves 41a and 41b or the second spacer body 42 between the third and fourth half grooves 42a and 42b. A second ring end 44 formed in one; And the second spacer body 42 between the first and second half-grooves 41a and 41b or between the third and fourth half-grooves 42a and 42b And an annular groove 45 in which the second ring end 44 is hooked. The second ring end 44 is formed in the first spacer body 41 and the ring groove 45 is formed in the second spacer body 42 in this embodiment.

In order to prevent the inflow pipe 11 and the inflow pipe 12 from moving in the first and second half grooves 41a and 41b and the third and fourth half grooves 42a and 42b, A friction layer 46 is formed which is in close contact with the surface of the pipe 12.

By the structure of the spacer 40, the inflow pipe 11 is inserted into the first and third half grooves 41a and 42a and the outflow tube 12 is inserted into the second and fourth half grooves 41b and 42b. The first annular end 43 is hooked to the other side end 40b of the second spacer body 42 and the second annular end 43 is engaged with the second annular end 42b of the second spacer body 42. When the first and second spacer bodies 41 and 42 are tightly contacted with each other, The step (44) is hooked on the ring groove (45) formed in the opposite spacer body. As a result, the first and second spacer bodies 41 and 42 remain in close contact with each other and do not open again. The friction layer 46 formed in the first and second half grooves 41a and 41b and the third and fourth half grooves 42a and 42b is formed in the first and third half grooves 41a) 42a and the second and fourth half-grooves 41b, 42b so that the movement is constrained.

The spacers 40 are connected to the inlet pipe 11 and the outlet pipe 12 at regular intervals, for example, at intervals of 1 m. Since the positions of the inlet pipe 11 and the outlet pipe 12 are fixed at intervals of 1 m It is possible to sustain the force applied in the vertical direction. Accordingly, when the heat exchange tube 10 is pushed into the ground for insertion into the borehole B having a depth of 200 m, it is possible to easily insert it.

7 is a view for explaining a bottom arrival signal generator installed in the weight of FIG.

As shown in the figure, the floor arrival signal generating unit 50 is installed in the weight 30 and generates a floor arrival signal when the heat exchange pipe 10 reaches the bottom of the bore hole B. The bottom arrival signal generating unit 50 includes a switch 51 protruding from the bottom side of the horn tip 31 and a signal generating unit 52 generating a floor arrival signal when the switch 51 is pressed . At this time, it is a matter of course that the bottom arrival signal generated by the signal generating unit 52 can be sound, light, or all files.

 With this structure, when the weight 30 touches the bottom of the bore hole B, the switch 51 is pushed to operate the signal generating part 52, ) Is inserted to the bottom of the bore hole (B).

Fig. 8 is a view for explaining the provision of the spacers in a state where the heat exchange tubes are arranged in a straight line in the geothermal heat exchanger of Fig. 2;

Since the inflow pipe 11 and the outflow pipe 12 are used by unrolling from a roll, they tend to bend toward one side. Therefore, when the spacer 40 is to be installed on the inflow pipe 11 and the outflow pipe 12, the inflow pipe 11 and the outflow pipe 12 are extended in a straight line L A plurality of spacers (40) are installed at regular intervals. The spacer 40 is positioned and fixed so as not to move the inlet pipe 11 and the outlet pipe 12 so that the inlet pipe 11 and the outlet pipe 12 can maintain a straight line without bending.

In order to insert the geothermal heat exchanger of the present invention into the borehole, the spacers 40 are installed in the inlet pipe 11 and the outlet pipe 12 at regular intervals to maintain a straight line state. The weights 30 are inserted into the bore holes B after the fitting portion 20 is connected to the connection pipe 13 and then the weights 30 are connected to the fitting portion 20. Then, The inflow pipe 11 and the outflow pipe 12 are gradually inserted into the bore hole B. [ The inlet pipe 11 and the outlet pipe 12 are naturally inserted into the bore hole B by the weight of the weight 30. [ When the weight 30 is then closed at the bottom of the bore hole B, the bottom arrival signal generator 50 generates a floor arrival signal and stops the insertion of the inflow pipe and the outflow pipe on the ground. Then, filling the bore hole (B) with the electrically conductive grout material (G) and connecting the inflow pipe and the outflow pipe connected to the ground to the heat pump, the construction is completed.

As described above, according to the present invention, it is possible to quickly insert the inlet pipe 11 and the outlet pipe 12 into the borehole B having a depth of several hundreds of meters by connecting the weight 30 to the connection pipe 13 have. Therefore, it is possible to prevent the piping and the pump of the grout recharging equipment from being clogged during the grouting, and as a result, the working time can be shortened, and the geothermal construction cost can be reduced as a whole.

The spacer 40 is used to insert the heat exchange tube 10 into the bore hole B with a constant distance between the inlet pipe 11 and the outlet pipe 12, It is possible to prevent the tube 12 from being twisted in an irregular shape. Therefore, it is possible to prevent the occurrence of pores in the grouting, to eliminate heat interference, and to maximize the temperature difference between the inlet pipe 11 (and the outlet pipe 12), thereby maximizing the heat exchange efficiency of the geothermal heat have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10 ... heat exchanger tube 11 ... inlet tube
12 ... outlet pipe 13 ... connector
20 ... fitting portion 21 ... body
21a ... U-shaped groove 22 ... interference groove
23 ... bolt end 24 ... sub-clamping end
30 ... Chu 30a ... napong
40 ... spacers 41, 42 ... spacer body
41a, 41b ... First and second half grooves 42a, 42b ... Third and fourth half grooves
43 ... 1st ring 44 ... 2nd ring
45 ... ring groove 46 ... friction layer
50 ... floor arrival signal generator 51 ... switch
52 ... signal generator

Claims (6)

And an outlet pipe 12 through which the heating medium flows out. The outlet pipe 12 is connected to the outlet pipe 12. The outlet pipe 12 is connected to the inlet pipe 11 and the outlet pipe 12, (10) composed of a heat exchanger (13); And
Maintaining a constant gap between the inlet pipe 11 and the outlet pipe 12, the first and second spacer bodies 41 and 42 of the symmetrical form to which one end 40a is connected, and the first The first and second half grooves 41a and 41b, which are formed to be spaced apart from the spacer body 41, into which the first inlet pipe 11 and the outlet pipe 12 are fitted, respectively, and are spaced apart from the second spacer body 42. And third and fourth half grooves 42a and 42b which are formed to be symmetrical with the first and second half grooves 41a and 41b to sandwich the inlet pipe 11 and the outlet pipe 12, respectively, A spacer (40) formed at the other end of the first spacer body (41) and having a first ring end (43) hooked to the other end (40b) of the second spacer body (42). Geothermal heat exchanger for geothermal heating and cooling. The method of claim 1,
It further comprises a fitting connecting portion 20 is installed in the connecting pipe 13, the weight 30 is connected to the fitting connecting portion (20);
The fitting connection portion 20 includes a fitting connection body 21 formed with a U-shaped groove 21a into which the coupling pipe 13 is inserted and a connecting pipe 21 formed at one end of the U- And a bolt end 23 screwed to the screw hole 30a formed in the weight 30 so as to be inserted into the U groove 21a, Geothermal heat exchanger for geothermal heating and cooling. The method of claim 2, wherein the weight 30,
And a horn-shaped horn tip (31) formed on the tip of the horn. 3. The method of claim 2,
Further comprising a bottom arrival signal generator (50) installed in the weight (30) and generating a bottom arrival signal when the weight (30) is closed at the bottom of the borehole (B) Geothermal heat exchanger for heating and cooling. 2. The device of claim 1, wherein the spacer (40)
And a second spacer body 42 between the first spacer body 41 or the third and fourth half grooves 42a and 42b between the first and second half grooves 41a and 41b. 2 ring (44); And
And the second spacer body 42 between the first spacer body 41 or the third and fourth half grooves 42a and 42b between the first and second half grooves 41a and 41b And a ring groove (45) to which the second ring end (44) is hooked. The method as claimed in claim 4, wherein the first and second troughs (41a, 41b) and the third and fourth troughs (42a, 42b) Wherein a friction layer (46) is formed in close contact with surfaces of the inflow pipe (11) and the outflow pipe (12).

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