KR101293216B1 - Geothermal heat exchanger - Google Patents

Abstract

The present invention relates to a geothermal heat exchanger, the inlet pipe is provided with a flow path through which the heat exchange medium flows, and the inlet pipe is in communication with each other, the heat exchange medium is introduced into the underground to exchange heat with the underground geothermal, it is connected to each other And a heat exchange part provided with a plurality of first unit pipes arranged in a circle so that a space portion extending in a vertical direction can be formed at the center thereof, and communicating with the heat exchange part, and discharging the heat exchange medium heat-exchanged with geothermal heat to the ground through the heat exchange part. A discharge pipe is provided.
The geothermal heat exchanger according to the present invention has an advantage of increasing heat exchange area and heat contact time of the heat exchange medium to geothermal heat by expanding a flow path through which the heat exchange medium flows underground.

Description

Geothermal heat exchanger

The present invention relates to a geothermal heat exchanger, and more particularly, to a geothermal heat exchanger that heats a heat exchange medium using geothermal heat such as underground air and groundwater.

In general, energy used for cooling and heating uses fossil fuel, or fossil fuel or power energy produced by using nuclear power. However, the fossil fuel is used to control water quality and environment due to various pollutants generated during combustion. Recently, development of alternative energy is actively progressed due to the disadvantage of polluting and the increase of unit cost due to resource limitation.

Among these alternative energies, research on wind energy, solar heat, geothermal energy, etc., which have infinite energy, and air-conditioning devices using them are used. These energy sources have the advantage of obtaining energy with little effect on air pollution and climate change. The disadvantage is that the energy density is very low.

In particular, in order to obtain energy using wind and solar heat, a large area must be secured along with the limit of the installation site, and energy production due to environmental variability may not always be constant. In addition, installation and maintenance are expensive.

Therefore, a constant energy can be obtained at all times, and a lot of air-conditioning and heating devices using geothermal energy, which is relatively inexpensive to install and maintain, are used. This is a technology that uses geothermal energy of a constant underground temperature.

Commonly used geothermal heating and cooling device is composed of a geothermal heat exchanger for recovering geothermal heat and a heat pump to move the recovered geothermal heat to a necessary place to perform the cooling and heating.

The installation of the geothermal heat exchanger drills the bore-holes 50m ~ 200m deep at a predetermined interval, inserts the geothermal heat exchanger into each of the excavated boreholes, and then interconnects the adjacent geothermal heat exchangers. After that, install them by connecting them with a heat pump. Each bore hole installed in the geothermal heat exchanger is filled with soil and then grouted.

In general, the geothermal heat exchanger is provided with a heat exchanger tube extending in the vertical direction to enter the bore hole. However, the heat exchange tube has a disadvantage in that the heat exchange efficiency is low because the single tube is extended in a straight line so that the thermal contact area and thermal contact time for geothermal heat are limited.

The present invention has been made to improve the above problems, and an object thereof is to provide a geothermal heat exchanger having a heat exchanger tube formed to extend the thermal contact area and thermal contact time of a heat exchange medium to underground geothermal heat. .

The geothermal heat exchanger according to the present invention for achieving the above object is in communication with the inlet pipe, the inlet pipe is provided with a flow path through which the heat exchange medium flows, and the base heat exchange medium is introduced into the base to heat exchange with the underground geothermal heat It is to be connected to each other, the heat exchanger is provided with a plurality of first unit pipes arranged in a circle arranged to form a space extending in the vertical direction in the center, the heat exchanger is in communication with the heat exchanger, It is provided with a discharge pipe for discharging the heat exchange medium heat-exchanged with geothermal heat to the ground.

The unit pipe communicates with a first extension part extending downward to induce a flow of the heat exchange medium introduced into the lower part and a lower end of the first extension part and passing through the first extension part. It is preferable to have a second extension portion which is formed to be bent upward so as to guide the flow of the heat exchange medium upward.

In addition, the geothermal heat exchanger according to the present invention further includes a preheater installed between the inlet pipe and the heat exchanger to preheat the heat exchange medium introduced through the inlet pipe and to supply the heat exchanger to the preheater. A first connection pipe communicating with the first connection pipe having a path through which the heat exchange medium flows, and communicating with the first connection pipe to the basement below the heat exchange unit so as to heat exchange the heat exchange medium with underground geothermal heat. A second heat exchanger, which is drawn in, is connected in communication with each other and is provided with a plurality of preheating tubes arranged in sequence, and a second connection tube which is connected to the auxiliary heat exchanger and supplied to the heat exchanger that is preheated through the preheater tubes. It is provided.

On the other hand, the geothermal heat exchanger according to the present invention is connected to the first manifold and the first manifold communicated to the supply unit so that the heat exchange medium flows from the supply unit, there is a flow path through which the heat exchange medium flows An injection tube provided, a heat exchange tube connected to the injection tube and introduced underground to heat exchange the heat exchange medium with underground geothermal heat, and a heat exchange tube connected to the heat exchange tube and heat exchanged with the geothermal heat through the heat exchange tube. A plurality of heat exchange units provided with discharge pipes for discharging the heat exchange medium to the ground, a second manifold connected to the discharge pipes of the heat exchange units, for collecting and discharging the heat exchange medium discharged from the discharge pipes, and the injection pipe A first opening / closing valve installed in the field to open and close each of the injection pipes, and installed in the discharge pipes to open and close each of the discharge pipes. And a valve unit provided with a second opening / closing valve, wherein each of the heat exchange tubes of the heat exchange units may be installed in a basement at a position spaced apart from each other along the vertical direction.

The geothermal heat exchanger according to the present invention has an advantage of increasing heat exchange area and heat contact time of the heat exchange medium to geothermal heat by expanding a flow path through which the heat exchange medium flows underground.

1 is a circuit diagram of a heat exchange system using a geothermal heat exchanger according to the present invention,
Figure 2 is a perspective view of the geothermal heat exchanger of Figure 1,
3 is a side view of a geothermal heat exchanger according to another embodiment of the present invention;
Figure 4 is a side view of a geothermal heat exchanger according to another embodiment of the present invention.

Hereinafter, a geothermal heat exchanger according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 illustrate a geothermal heat exchanger 110 according to an embodiment of the present invention.

Referring to the figure, the geothermal heat exchanger 110 forms a heat exchange system together with a supply for supplying a heat exchange medium. The geothermal heat exchanger 110 is connected to the inlet pipe 120 and the inlet pipe 120 is provided with a flow path through which the heat exchange medium flows therein, and a heat exchanger that is introduced into the base to heat exchange the heat exchange medium with the underground geothermal heat ( 130 and a discharge tube 140 for discharging the heat exchange medium that has passed through the heat exchange unit 130 to the outside.

The inlet pipe 120 communicates with the supply pipe of the supply unit described later to allow the heat exchange medium to flow from the supply unit, and is formed of a pipe extending a predetermined length.

The heat exchanger 130 is connected in communication with each other, and has a plurality of unit pipes 131 arranged in a circle so that a space portion extending in the vertical direction may be provided at the center thereof. The unit pipe 131 is in communication with the lower end of the first extension portion 132 and the first extension portion 132 extending downward to guide the flow of the heat exchange medium introduced into the lower portion, the first extension The second extension part 133 is formed to be bent upwardly to guide the flow of the heat exchange medium passing through the part 132 upward.

Since the heat exchange part 130 configured as described above has a plurality of unit pipes 131 arranged in a circle, a larger number of unit pipes 131 are installed in the borehole than the unit pipes 131 arranged in a straight line. The passage of the heat exchange medium in the basement can be extended. The heat exchanger 130 has an advantage of improving heat exchange efficiency because the flow path of the heat exchange medium is expanded to increase the thermal contact area and the contact time of the heat exchange medium to the geothermal heat.

On the other hand, although not shown in the figure, the geothermal heat exchanger 110 is connected in communication between the heat exchanger 130 and the discharge pipe 140, it is installed to be inserted into the space portion of the heat exchanger 130, the heat exchanger 130 A secondary heat exchanger may be further provided to circulate the heat exchange medium passing through the space of the heat exchanger 130 to re-exchange heat with geothermal heat.

The supply unit 200 is installed in the heat exchange chamber 211, the heat exchange medium 2, the geothermal heat exchanger 110 and the heat exchange chamber 211, the supply pipe 213 and return pipe 214 and the supply pipe 213 A circulation pump 215 for pumping a heat exchange medium, and a heat pump unit 20 installed in the heat exchange chamber 211 to transfer heat supplied from the geothermal heat exchanger 110 to a heating target such as a facility house. .

The heat exchange medium heated by heat exchange with geothermal heat through the geothermal heat exchanger 110 is supplied to the heat exchange chamber 211 through a supply pipe 213. The high temperature heat exchange medium introduced into the heat exchange chamber 211 exchanges heat with the first heat exchanger 22 of the heat pump unit 20 described later. As mentioned above, the first heat exchanger 22 absorbs a large amount of heat energy by exchanging heat with a high temperature heat exchange medium heated by geothermal heat, and thus heating efficiency of the second heat exchanger 21 of the heat pump unit 20 described later. To improve.

The heat pump unit 20 is installed in the heat exchange chamber 211 to heat exchange with the heat exchange medium, the first heat exchanger 22, the second heat exchanger 21 installed in the heating and cooling target, and the first and second heat exchanger Expansion of the first and second refrigerant circulation pipes (23, 24) and the first refrigerant circulation pipe (23), which controls the flow of the refrigerant, by connecting the (21, 22) to form a closed circuit and the refrigerant flowing therein The valve 26 and the compressor 25 and the four-way valve 27 provided in the 2nd refrigerant circulation pipe 24 are provided.

At a position adjacent to the second heat exchanger 21 installed outside of the heating and cooling target, a circulation fan may be installed so that the refrigerant passing through the second heat exchanger 21 can easily exchange heat with air outside the cooling and heating target. Do.

At this time, the second refrigerant circulation tube 24 mutually connects the first heat exchanger 21 and the compressor 25 with the first pipe member 28 and the second heat exchanger 22 and the compressor 25. A second pipe member 29 for connecting is provided.

Referring to the operation of the heat exchange system 100 using the geothermal heat exchanger 110 according to the present invention configured as described above in detail as follows.

The heat exchange medium accommodated in the heat exchange chamber 211 flows into the geothermal heat exchanger 110 through the supply pipe 213. The heat exchange medium introduced into the geothermal heat exchanger 110 flows along the flow path of the geothermal heat exchanger 110 and exchanges heat with underground geothermal heat. The heat exchange medium heated by geothermal heat is introduced into the heat exchange chamber 211 through the return pipe 214. The heat exchange medium is heated while circulating the heat exchange chamber 211 and the geothermal heat exchanger 110.

The high temperature heat exchange medium accommodated in the heat exchange chamber 211 heats the first heat exchanger 22 to heat the refrigerant. The refrigerant having a low temperature and low pressure gas evaporated by absorbing heat from the outside in the first heat exchanger 22 is introduced into the compressor 25 through the second pipe member 29. The low temperature low pressure refrigerant is compressed to be in a state of high temperature and high pressure by the compressor 25, and the high temperature high pressure refrigerant flows into the second heat exchanger 21 through the first pipe member 28.

On the other hand, the high temperature and high pressure refrigerant gas introduced into the second heat exchanger 21 releases heat to the inside of the heating and cooling target while exchanging heat with the internal air of the heating and cooling target. Here, the refrigerant is liquefied into a liquid state at low temperature and high pressure. The refrigerant having a low temperature and high pressure in the liquid state is passed through the expansion valve 26 through the first refrigerant circulation pipe 23 by the second heat exchanger 21, and the refrigerant is decompressed by the expansion valve 26 to reduce the temperature at low temperature. Becomes Refrigerant, which is in a low pressure state by the expansion valve 26, flows into the first heat exchanger 22 through the first refrigerant circulation pipe 23, and the refrigerant introduced into the first heat exchanger 22 receives external heat. Absorbed into a gaseous state of low temperature and low pressure flows into the compressor (25).

The geothermal heat exchanger 110 according to the present invention configured as described above can increase the heat contact area and heat contact time of the heat exchange medium to the geothermal heat by expanding the flow path through which the heat exchange medium flows underground, thereby improving heat exchange efficiency. There is an advantage.

On the other hand, Figure 3 shows a geothermal heat exchanger 300 according to another embodiment of the present invention.

Elements having the same functions as those in the previous drawings are denoted by the same reference numerals.

Referring to the drawings, the geothermal heat exchanger 300 is installed between the inlet pipe 120 and the heat exchanger 130 to preheat the heat exchange medium introduced through the inlet pipe 120 to supply to the heat exchanger 130 It is further provided with (310).

The preheating unit 310 is in communication with the inlet pipe 120, the first connection pipe 311 and the first connection pipe 311 is provided in the path through which the heat exchange medium flows therein, and the heat exchange medium underground Subsidiary heat exchanger 312, which is introduced into the basement so as to exchange heat with the geothermal heat, and the secondary heat exchanger 312 is in communication with, and the preheated heat exchange medium through the auxiliary heat exchanger 312 supplies the heat exchanger 130 Two connection pipe 313 is provided.

The first connection pipe 311 is in communication with the inlet pipe 120, the flow path of the heat exchange medium is provided therein, is formed in a pipe shape extending downward.

The auxiliary heat exchanger 312 is connected in communication with each other, and has a plurality of preheating tubes 314 arranged in sequence. At this time, the preheating tubes 314 are arranged along the radial direction of the space portion formed in the center of the heat exchange unit 130. The preheating tubes 314 extend in parallel to each other in the vertical direction so as to be perpendicular to the arrangement direction, and are connected to each other so that the flow path through which the heat exchange medium flows is formed in a zigzag shape. At this time, the preheating tube 314 is preferably installed to be located below the heat exchanger 130 so as to be heat-exchanged with the geothermal heat higher than the heat exchanger 130.

Meanwhile, in the illustrated example, the structure in which the auxiliary heat exchanger 312 is zigzag-shaped has been described, but the auxiliary heat exchanger 312 is not limited to the illustrated example, but is formed spirally so as to expand the flow path of the heat exchange medium. It may be.

The second connecting pipe 313 is installed in communication with the preheating pipe 314 located at the outermost side from the first connecting pipe 311, and the upper end so that the end can communicate with the unit pipe 131 of the heat exchange part 130. It is extended to.

The heat exchange medium introduced from the supply part flows into the first connection pipe 311 through the inlet pipe 120, and the heat exchange medium flows into the auxiliary heat exchange part 312 through the first connection pipe 311. The heat exchange medium introduced into the auxiliary heat exchange unit 312 passes through a plurality of preheating tubes 314 and is heated by heat exchange with geothermal heat, and is transferred to the unit pipe 131 of the heat exchange unit 130 through the second connection tube 313. Inflow. As mentioned above, the preheating tube 314 heats the heat exchange medium introduced into the heat exchange unit 130 with the underground geothermal heat lower than the heat exchange unit 130, thereby improving the heating efficiency of the heat exchange medium.

On the other hand, Figure 4 shows a geothermal heat exchanger 400 according to another embodiment of the present invention.

Referring to the drawings, the geothermal heat exchanger 400 includes a first manifold 410 communicating with the supply unit so that heat exchange medium may be introduced from the supply unit, and a plurality of heat exchange units connected in communication with the first manifold 410. 420, a second manifold 430 connected to the heat exchange units 420, for collecting and discharging the heat exchange medium discharged from the heat exchange units 420, and the heat exchange unit 420. And a valve unit 440 for controlling the inflow of the heat exchange medium into the air and the discharge of the heat exchange medium from the heat exchange units 420.

The first manifold 410 communicates with the supply pipe of the supply unit to supply the heat exchange medium to the plurality of heat exchange units 420.

The heat exchange unit 420 is connected to the first manifold 410, and communicates with the injection pipe 421 provided with a flow path through which the heat exchange medium flows, and communicates with the injection pipe 421, and the heat exchange medium is underground. A heat exchange tube 422 introduced into the base so as to exchange heat with the geothermal heat of the discharge tube, and a discharge pipe communicating with the heat exchange tube 422 and discharging the heat exchange medium heat-exchanged with the geothermal heat to the ground through the heat exchange tube 422. 423 is provided.

The injection pipe 421 is connected in communication with the first manifold 410 and is formed in a pipe shape extending downward to be led into the basement.

The heat exchange tube 422 is connected in communication with each other, and has a plurality of auxiliary pipes 429 extending in the vertical direction. In the heat exchange tube 422, auxiliary tubes 429 are arranged in a circular shape so that a space portion extending in the vertical direction may be formed at the center thereof.

Meanwhile, in the illustrated example, the heat exchange tube 422 has a structure in which a space portion is formed at the center by the plurality of auxiliary tubes 429. However, the heat exchange tube 422 is not limited to the illustrated example, but may be formed in a wave shape or a spiral shape. It may be.

In this case, the heat exchange tubes 422 of the heat exchange units 420 may be installed at positions spaced apart from each other along the vertical direction so that the temperature of the heat exchange medium heated by heat exchange with geothermal heat through each heat exchange unit 420 is different. Do.

When the discharge pipe 423 is connected in communication with the end of the heat exchange pipe 422, the end is connected in communication with the second manifold 430.

The valve unit 440 is installed in the injection pipes 421 and opens and closes the first opening and closing valve 441 and the discharge pipes 423, respectively. It is provided with a second open and close valve 442 for opening and closing. Preferably, the first and second open / close valves 441 and 442 are solenoid valves so as to be easily controlled by a user.

Since the valve unit 440 selectively opens and closes the injection pipe 421 and the discharge pipe 423 of each heat exchange unit 420, a heat exchange medium heated to a desired temperature can be selectively used without a separate temperature control means.

On the other hand, although not shown in the figure, the geothermal heat exchanger 400 according to the present invention is installed in each discharge pipe 423 of the heat exchange unit 420 is connected to the temperature sensor and the temperature sensor for measuring the temperature of the heat exchange medium, The display unit may further include a display unit displaying temperature information of the heat exchanging medium discharged through each discharge pipe 423.

The display unit displays temperature information of the heat exchange medium heated by each heat exchange unit 420 to the user, and the user heats the medium to the heat exchange unit 420 where the heat exchange medium is heated to a desired temperature through the temperature information provided through the display unit. The valve unit 440 is controlled to circulate.

Geothermal heat exchanger 400 according to the present invention configured as described above can be provided with a heat exchange medium of various temperatures without a separate temperature control means by heat exchange tubes 422 installed in spaced apart positions along the vertical direction There is an advantage.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

110: geothermal heat exchanger
120: inlet pipe
130: heat exchanger
131: unit pipe
140: discharge pipe
310: preheater
311: first connector
312: auxiliary heat exchanger
313: second connector
314: preheating tube
410: first manifold
420: heat exchange unit
430: second manifold
440: valve unit
441: first opening and closing unit
442: second opening and closing unit

Claims (4)

An inlet pipe having a flow path through which a heat exchange medium flows;
In communication with the inlet pipe, the heat exchange medium is introduced into the base so as to heat exchange with the geothermal heat of the underground, are connected in communication with each other, the plurality of circularly arranged to form a space extending in the vertical direction in the center A heat exchange part provided with a unit pipe;
A discharge pipe communicating with the heat exchanger and discharging the heat exchange medium heat-exchanged with the geothermal heat through the heat exchanger to the ground;
And a preheater installed between the inlet pipe and the heat exchanger to preheat the heat exchange medium introduced through the inlet pipe to supply the heat exchanger.
The unit pipe communicates with a first extension part extending downward to induce a flow of the heat exchange medium introduced into the lower part and a lower end of the first extension part and passing through the first extension part. It is provided with a second extending portion is formed to be bent upwardly to guide the flow of the heat exchange medium upwards,
The pre-
A first connection pipe communicating with the inlet pipe and having a path through which the heat exchange medium flows;
It is connected to the first connecting tube, the heat exchange medium is introduced into the basement lower than the heat exchange unit to exchange heat with the underground geothermal, it is connected in communication with each other, a plurality of pre-heating tubes arranged in sequence Heat exchanger,
And a second connecting pipe communicating with the auxiliary heat exchanger and supplying the heat exchanger to be preheated through the preheating tubes.
delete delete A first manifold in communication with the supply portion such that a heat exchange medium can be introduced from the supply portion;
An injection pipe connected to the first manifold and having a flow path through which the heat exchange medium flows, and a heat exchanger connected to the injection pipe so that the heat exchange medium can exchange heat with the underground geothermal heat. A plurality of heat exchange units communicating with a tube and the heat exchange tube, the discharge tube discharging the heat exchange medium heat-exchanged with the geothermal heat to the ground through the heat exchange tube;
A second manifold connected to the discharge pipes of the heat exchange units and configured to collect and discharge the heat exchange medium discharged from the discharge pipes;
A valve unit provided in the injection pipes and having a first open / close valve for opening and closing each injection pipe, and a second open / close valve installed in the discharge pipes to open and close each discharge pipe;
Geothermal heat exchanger, characterized in that each of the heat exchange tubes of the heat exchange units are installed in the basement of the spaced apart position in the vertical direction.

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