KR102351998B1 - Open type geothermal exchanger with ground surface water as heat source and heat exchange method using the same - Google Patents

Abstract

The present invention provides an open underground heat exchanger with underground surface water as a heat source, which can collect a sufficient amount of underground water by excavating a shallow well. The open underground heat exchanger with underground surface water as a heat source comprises: a plurality of pumping wells (10) having deep-well pumps (120) and intake pipes of a prescribed length installed therein and having a length of approximately 20-60 m, wherein a lower portion thereof (10L) from the lower end thereof to an approximately 2/3 height point is formed as a perforated pipe with a plurality of opening parts (130), and an upper portion (10H) thereof from the approximately 2/3 height point to the ground surface is formed as a cylinder without an opening part; a plurality of water return wells (20) having a length of approximately 20-60 m and alternately arranged while having a prescribed distance from the plurality of pumping wells (10), wherein a lower portion thereof (20L) from the lower end thereof to an approximately 2/3 height point is formed as a perforated pipe with a plurality of opening parts (230), and an upper portion (20H) thereof from the approximately 2/3 height point to the ground surface is formed as a cylinder without an opening part; a ground heat exchanger (30); a plurality of supply paths (40); and a plurality of water return paths (60).

Description

Open type underground heat exchanger using underground surface water as heat source and heat exchange method using the same

The present invention relates to an open type underground heat exchanger using underground surface water as a heat source and a heat exchange method using the same, and more particularly, to a plurality of low-depth areas with abundant underground surface water, such as areas where alluvial deposits are developed, coastal areas, and rivers. It relates to an open type underground heat exchanger that takes in underground surface water from an intake well, exchanges heat in an above-ground heat exchanger, and then returns it to a plurality of exchange wells, and a heat exchange method using the same.

In general, the underground heat source acquisition method in the underground heat exchanger can be broadly classified into four types. A vertical sealed type underground heat exchanger in which a borehole is vertically drilled in the ground and an underground heat exchanger is installed; Underground horizontal type underground heat exchanger, which installs a trench horizontally in the ground and underground and installs an underground heat exchanger; An energy pile type underground heat exchanger that installs an underground heat exchanger on the foundation pile of a building; And it can be classified as a standing column well (SCW) type geothermal heat exchanger in which a geothermal well hole is installed vertically in the ground, ground water is taken in from the well hole, heat exchanged, and then returned to the same geothermal well hole. . Among them, the vertical sealed type underground heat exchanger and the standing column well type underground heat exchanger are most commonly applied. The vertically sealed underground heat exchanger is a method in which a hole with a diameter of about 150 mm is drilled to a depth of about 150 m to 200 m, and the gap between the hole and hole is drilled within the site to about 5 m, and then the underground heat exchanger is installed and used as a heat source; In the case of a standing column-well type (SCW) underground heat exchanger, a hole with a diameter of about 200 mm is drilled to a depth of about 400 m to 500 m, and then a deep well pump is used to directly use groundwater as a heat source.

However, the vertical sealed type geothermal heat exchanger requires that the well be drilled to a depth of about 150 m to 200 m, and the standing column well type geothermal heat exchanger requires the well to be drilled to a depth of about 400 m to 500 m. Difficult cases may arise. In particular, excavation is difficult due to sand gravel and excessive leachate in the alluvial layer, the vicinity of rivers, and the coastal zone, where the sand gravel layer is deep, and there is a problem in that the cost is excessive.

1, in Korean Patent No. 10-1566654, the underground heat exchanger 510 has a structure in which a suction pipe 530 and a return pipe 540 are installed in one pipe well 520, and the suction An open geothermal facility (500) in which groundwater supplied through a pipe (530) exchanges heat with a load-side heat exchange medium in the ground heat exchanger (550) and then is returned to a return pipe (540) is disclosed. In addition, as shown in FIG. 2 , in the open geothermal system 600 of Korean Patent No. 10-1512303, the geothermal heat exchanger 610 has a supply pipe 630 and a return pipe 640 installed in one well 620 . The supply pipe 630 is provided with a plurality of inlet holes 631 for introducing groundwater in some sections, and the return pipe 640 has a plurality of discharge holes 641 for returning groundwater to the ground in some sections. . In the open geothermal system 600 shown in FIG. 2 , the groundwater supplied through the supply pipe 630 exchanges heat with the load-side heat exchange medium in the ground heat exchanger 660 and then is returned to the return pipe 640 , and the return pipe 640 . ), the lower end is connected to the lower end of the supply pipe 630 by an H-shaped connecting pipe 650 .

Since the open geothermal facility 500 or the open geothermal system 600 disclosed in Korean Patent No. 10-1566654 and Korean Patent No. 10-1512303 both drill holes to a depth of 200 m or more vertically underground, the sand gravel layer In the deep alluvial layer, near rivers, and in coastal areas, it is difficult to construct the underground heat exchanger as it is, as described above.

In addition, the underground heat exchanger disclosed in Korean Patent No. 10-1566654 and Korean Patent No. 10-1512303 includes a medium that circulates the heat exchange circuit in the ground heat exchanger for groundwater taken from the ground through one well (520, 620) and As a method of exchanging heat-exchanged water to the ground through the same wells 520 and 620 , it is a method of recovering heat quantity while the returned groundwater circulates through the wells 520 and 620 . In this case, the amount of time to recover heat varies depending on the amount of groundwater source, and if the operation of the underground heat exchanger continues for a long time, the amount of heat in the groundwater gradually decreases, which may result in poor efficiency or restrictions on the use of the underground heat exchanger.

An object of the present invention is to solve the problems of the prior art, in an area where alluvial deposits are developed, along the coast, near a river, etc., in an area with abundant underground surface water, etc. It is to provide an open type underground heat exchanger for exchanging water to a plurality of exchange wells and a heat exchange method using the same. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

An open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention for achieving the above object is inserted in a vertical direction into a well of a low depth of about 20 - 60 m in order to take in underground surface water, Intake pipes of a predetermined length are arranged inside, and deep well pumps are installed at the lower ends of the intake pipes, and have a length of about 20 - 60 m, and the lower part from the lower end to about 2/3 height is formed as a perforated pipe having a plurality of openings. and a plurality of intake wells formed as cylinders having no openings at an upper portion from a height of about 2/3 to the ground surface; It is vertically inserted into a well of a low depth of about 20 - 60 m, is alternately disposed with a predetermined distance from the plurality of intake wells, has a length of about 20 - 60 m, and extends from the lower end to about 2/3 of the height. a plurality of round wells formed as a perforated tube having a plurality of openings in the lower part and a cylinder having no openings in the upper part from the height of about 2/3 to the ground surface; a ground heat exchanger for exchanging the underground surface water sucked in by the deep well pumps of the plurality of intake wells with a heat exchange medium circulating in the load side heat exchange circuit; a plurality of supply paths connecting the outlets of the intake pipes of the plurality of intake wells and the inlets of the above-ground heat exchanger; and a plurality of return channels connecting outlets through which the ground surface water heat-exchanged with the heat exchange medium circulating on the load side in the ground heat exchanger is discharged and the inlets of the plurality of exchange wells.

An open type underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention is vertically inserted into a well of a low depth of about 20 - 60 m in order to intake underground surface water, and an intake pipe of a predetermined length therein are arranged, and deep well pumps are installed at the lower end of the intake pipes, have a length of about 20 - 60 m, and the lower part from the lower end to about 2/3 height is formed of a perforated pipe having a plurality of openings, and about 2/3 height point a plurality of intake wells formed in a cylinder having no openings at the upper portion from the to the ground; It is vertically inserted into a well of a low depth of about 20 - 60 m, is alternately disposed with a predetermined distance from the plurality of intake wells, has a length of about 20 - 60 m, and extends from the lower end to about 2/3 of the height. a plurality of round wells formed as a perforated tube having a plurality of openings in the lower part and a cylinder having no openings in the upper part from the height of about 2/3 to the ground surface; a ground heat exchanger for exchanging the underground surface water sucked in by the deep well pumps of the plurality of intake wells with a heat exchange medium circulating in the load side heat exchange circuit; a plurality of supply paths connecting the outlets of the intake pipes of the plurality of intake wells and the inlets of the above-ground heat exchanger; It may include: a distributor connected to outlets through which the ground surface water heat-exchanged with the heat exchange medium circulating on the load side in the above-ground heat exchanger is discharged; and a plurality of return channels connecting the inlets of the plurality of exchange wells from the distributor.

In the open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the plurality of intake wells and the plurality of exchange wells may be alternately arranged in a line or arranged in a plurality of rows of a rectangle.

In addition, in the open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the intake well and the exchange well may be disposed with an interval of about 15 m.

In addition, in the open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, a plurality of cylindrical outer casings are respectively installed around the outer periphery of the plurality of intake wells and the plurality of exchange wells, and the plurality of intake wells and the Cement grouting material may be injected into the space between the plurality of outer casings and the space between the plurality of exchange water wells and the plurality of outer casings.

In addition, in the open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the plurality of openings provided in the lower part of the intake well may be formed of a plurality of through holes or a plurality of slits.

In addition, in the open type geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, a sand remover including a sand removal network and a drain valve may be additionally provided in the plurality of supply paths.

In addition, in the open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, a flow distribution pipe connecting a plurality of exchange wells horizontally to minimize the phenomenon that water returned from the ground heat exchanger overflows in the exchange well may further include.

In addition, in the open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, a plurality of overflow pipes are installed above the inlets to the plurality of return channels in the plurality of exchange wells, and the plurality of overflows The pipes may be connected to a sump.

In the heating/cooling system using an open type underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention, any one of the above-described open type underground heat exchangers is combined with a load-side heat exchange circuit including a heat pump, an expansion tank, and a heat source circulation pump. can be done

In the heating/cooling system using an open underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention, a buffer tank for storing the hot water produced by the heat pump may be further included.

The heat exchange method of an open underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention is vertically inserted into a well of a low depth of about 20 - 60 m, and has a length of about 20 - 60 m from the lower end Intake of underground surface water through a plurality of intake wells in which the lower part up to the 2/3 height point is formed as a perforated pipe having a plurality of openings, and the upper part from the about 2/3 height point to the ground surface is formed as a cylinder without an opening ; supplying the underground surface water taken in in the water intake step to the ground heat exchanger through intake pipes and deep well pumps disposed inside the plurality of intake wells; exchanging the underground surface water supplied to the ground heat exchanger by the plurality of deep well pumps with a heat exchange medium circulating in a load side heat exchange circuit; and the underground surface water exchanged with the heat exchange medium of the load side heat exchange circuit in the heat exchange step is vertically inserted into a well of a low depth of about 20 - 60 m, the upper part is formed in a cylinder without an opening, and the lower part is provided with a plurality of openings It is formed of one perforated pipe, is alternately arranged at a predetermined distance from the plurality of intake wells, has a length of about 20 - 60 m, and the lower part from the lower end to about 2/3 height is a perforated pipe having a plurality of openings. It is formed and the upper part from the point of about 2/3 height to the ground surface may include the step of changing the water through a plurality of exchange wells formed into a cylinder without an opening.

In the heat exchange method of an open type underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention, in the return step, the water returned from the ground heat exchanger to the plurality of return wells is converted into a plurality of return channels through a flow rate distributor. can be returned to

According to the open type underground heat exchanger of an embodiment of the present invention made as described above, in an area where the alluvial layer is developed, along the coast, near a river, etc., underground surface water is withdrawn from a plurality of intake wells at a low depth in the ground heat exchanger. Since it can be exchanged into a plurality of exchange wells after heat exchange, it is possible to extract a sufficient amount of groundwater by excavating a well at a low depth in a ground with a lot of ground surface water without the need to excavate the well to a deep depth. It is possible to acquire sufficient amount of heat while allowing groundwater to be returned to its original state without being depleted by using a plurality of water exchange wells. Of course, the scope of the present invention is not limited by these effects.

1 is a conceptual diagram showing a geothermal facility using a conventional open geothermal heat exchanger.
2 is a conceptual diagram illustrating a conventional open geothermal system.
3 is a conceptual diagram illustrating a geothermal system using an open geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a plurality of intake wells in an open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, and a connection flow path between the ground heat exchanger and the plurality of exchange wells.
5 is a schematic cross-sectional view of an intake well of an open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention.
6 is a schematic cross-sectional view of a water exchange well of an open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention.
7A to 7E are views illustrating an installation process of an open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention.

The objects, features and advantages of the present invention described above will become more apparent through the following examples in conjunction with the accompanying drawings.

The specific structural or functional descriptions below are only exemplified for the purpose of describing embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention may be implemented in various forms and described in the present specification or application. It should not be construed as being limited to the examples.

Since the embodiment according to the concept of the present invention may have various changes and may have various forms, specific embodiments are illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific disclosed form, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

When it is said that a certain element is "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in between. will have to be understood On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle. Other expressions for describing the relationship between elements, that is, expressions such as “between” and “immediately between” or “adjacent to” and “directly adjacent to”, should be interpreted similarly.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. As used herein, terms such as “comprise” or “have” are intended to designate that the described feature, number, step, action, component, part, or combination thereof is present, and includes one or more other features or numbers, It should be understood that the existence or addition of steps, operations, components, parts or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present specification. does not

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

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

3 is a conceptual diagram illustrating a geothermal system using an open geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention; 4 is a conceptual diagram illustrating a plurality of intake wells in the open type underground heat exchanger of FIG. 3, a connection flow path between the ground heat exchanger and a plurality of exchange wells; 5 is a schematic cross-sectional view of an intake well of an open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention; 6 is a schematic cross-sectional view of a water exchange well of an open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention.

The open type geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention is vertically inserted into a well of a low depth of about 20 - 60 m, and the upper part (10H) is formed as a cylinder without an opening, and the lower part (10L) is A plurality of intake wells (10) formed of a perforated pipe having a plurality of openings (130); a ground heat exchanger (30) for exchanging the underground surface water discharged from the plurality of intake wells (10) with the heat exchange medium of the load side heat exchange circuit; And a plurality of round wells inserted in the vertical direction into a well of a low depth of about 20 - 60 m, the upper part (20H) is formed as a cylinder without an opening, and the lower part (20L) is formed as a perforated pipe having a plurality of openings (230) (20).

In the open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the intake well 10 and the exchange well 20 are installed by drilling a well of a low depth of about 20 - 60 m, so the area where the alluvial layer is developed Intake wells and return wells can be easily constructed even in areas with abundant underground surface water such as coastal areas, rivers, etc. In addition, the open type geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention does not withdraw underground groundwater from one well and return heat-exchanged groundwater to the same well, but by taking underground surface water from a plurality of intake wells. Since it is a method of exchanging heat in the ground heat exchanger and then returning the water to a plurality of exchange wells, continuous use of one well for a long time does not cause a problem in that the heat quantity of the groundwater gradually decreases and the efficiency of the underground heat exchanger deteriorates. In the open type geothermal heat exchanger of the present invention using a plurality of intake wells and a plurality of exchange wells, sufficient heat can be obtained while returning groundwater to the original state so that groundwater is not depleted.

In the open type geothermal heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the plurality of intake wells 10, as shown in FIG. , and water intake pipes of a predetermined length are disposed therein, and deep well pumps 120 are installed at lower ends of the intake pipes 110 . Each of the plurality of intake wells 10 has a length of about 20 - 60 m, and the lower portion 10L from the lower end to about 2/3 height is formed as a perforated pipe having a plurality of openings 130 , and about 2 The upper part 10H from the /3 height point to the ground surface is formed as a cylinder without an opening. With this configuration, through the openings 130 formed in the lower part 10L of the intake well 10, the groundwater can be easily taken in from the area where the alluvial layer is developed, the coastline, the vicinity of a river, etc. can be used as a heat source for The plurality of openings 130 provided in the lower portion of the intake well 10 may be formed of a plurality of through holes or a plurality of slits. In FIG. 5 , the slit is illustrated as being formed in the longitudinal direction of the water intake well 10 , but the present invention is not limited thereto and may be formed in another direction.

5, 7b, and 7c, a plurality of cylindrical outer casings 150 are installed on the outer periphery of the plurality of intake wells 10 in the soil layer section, and the plurality of intake wells 10 and the plurality of intake wells 10 are provided. Cement grouting material 160 may be injected into the space between the outer casing 150 of the. In this way, when the outer casing 150 and the cement grouting material 160 are constructed in the soil layer section from the outer periphery of the intake well 10, the wells are installed underground in order to install the intake well of the open type underground heat exchanger according to the present invention. When drilling, the intake well in the soil layer composed of soil or gravel sand, etc. can be maintained aligned in place in the well. The outer casing 150 and the cement grouting material 160 should be installed in an area other than the perforated pipe area of the lower portion 10L of the intake well 10 .

The plurality of round crystals 20 are vertically inserted into a well of a low depth of about 20 - 60 m, as shown in FIG. 6 . Each of the plurality of round crystals 10 has a length of about 20 - 60 m, the upper part 20H from the ground surface to the middle point is formed in a cylinder without an opening, and the lower part 20L from the middle point to the lower part is It is formed as a perforated tube having a plurality of openings 230 . With this configuration, the groundwater is exchanged underground through the openings 230 formed in the lower part 20L of the exchange well 20, such as in an area where alluvial layer is developed, along the coast, around a river, and the like. The plurality of openings 230 provided in the lower portion of the round crystal 20 may be formed of a plurality of through-holes or a plurality of slits. In FIG. 6 , the slit is illustrated as being formed in the longitudinal direction of the ring crystal 20 , but the present invention is not limited thereto and may be formed in another direction.

6 and 7d and 7e, a plurality of cylindrical outer casings 250 are installed on the outer periphery of the plurality of round wells 20 in the soil layer section, and the plurality of round wells 20 and A cement grouting material 260 may be injected into the space between the plurality of outer casings 250 . In this way, when the outer casing 250 and the cement grouting material 260 are constructed in the soil layer section from the outer periphery of the exchange well 20, in order to install the exchange well of the open type underground heat exchanger according to the present invention in the ground When the well is drilled, the exchange well in the soil layer composed of soil, gravel, sand, etc. can be maintained in alignment with the well in place. The outer casing 250 and the cement grouting material 260 should be installed in an area other than the perforated pipe area of the lower part 20L of the exchange well 20 . On the other hand, a siphon prevention hole may be installed in the flange portion of the upper end of the exchange water well. When the level of the return pipe of the exchange well is lower than that of the machine room (ground heat exchanger), a phenomenon may occur where the returned water is sucked out by gravity and a negative pressure is generated in the pipe with the higher level. If you want to use it as water, water may not come out even if you install a branch pipe in the pipe at a location under negative pressure. The siphon prevention hole is an upper air inlet hole for preventing the above phenomenon.

In the open underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention, the intake well 10 and the exchange well 20 may be disposed with an interval of about 15 m. In addition, the plurality of intake water wells 10 and the plurality of round water wells 20 may be alternately arranged in a line, or may be arranged in a plurality of rows of two or more columns in a rectangle. In the case where a plurality of intake wells (10) and a plurality of exchange wells (20) are arranged in a plurality of rows of rectangles, in an odd numbered row, intake wells (10) → exchange wells (20) → intake wells (10) → exchange wells (20) in the order of It is preferably arranged in the order of the exchange well (20) → the intake well (10) → the exchange well (20) → the intake well (10) in an even row.

As shown in FIG. 3 , the underground surface water sucked in and sent out by the deep well pumps 110 of the plurality of intake wells 10 is a heat exchange medium circulating in the load side heat exchange circuit in the ground heat exchanger 30 installed on the ground and It is exchanged with the plurality of exchange wells (20) by heat exchange.

Ground surface water sucked in by the deep well pumps 110 of the plurality of intake wells 10 and delivered is ground heat exchange through a plurality of supply paths 40 connecting the outlets of intake pipes and the inlets of the ground heat exchanger 30 . It is supplied to the group (30).

In addition, the underground surface water heat-exchanged with the heat exchange medium circulating on the load side in the ground heat exchanger 30 is a plurality of return channels connecting the plurality of outlets of the ground heat exchanger 30 and the inlets of the plurality of exchange wells 20 . It is returned to a plurality of water exchange wells 20 through 60 and flows underground through the openings 230 of the exchange wells 20 . As such, groundwater whose temperature has been lowered due to heat exchange with the heat exchange medium in the ground heat exchanger 30 is not returned to the same well as the intake well, but is returned to the exchange well 20 disposed at a distance of about 15 m from the intake well 10. , the groundwater can recover a sufficient heat source, and the temperature of the groundwater heat source in the intake well 10 is prevented from being lowered.

On the other hand, the underground surface water supplied from the plurality of intake wells 10 to the ground heat exchanger 30 and heat exchanged with the load side heat exchange medium in the ground heat exchanger 30 is transferred to the plurality of outlets of the ground heat exchanger 30 and a plurality of return water Although it is possible to return water to the plurality of exchange wells 20 through the furnace 60, the groundwater is discharged to the distributor through one outlet in the above-ground heat exchanger 30, and then the plurality of return water passages 60 from the distributor It is also possible to exchange groundwater through a plurality of exchange wells 20 . In this way, if the distributor is used, the water discharged from the ground heat exchanger 30 can be exchanged evenly in the plurality of exchange wells 20 .

Since the open type geothermal heat exchanger 1 according to an embodiment of the present invention uses underground surface water distributed in areas such as areas where alluvial layers are developed, the coast, and around rivers, sand, etc. It may be sent to the ground heat exchanger (30). In this way, in order to prevent sand, etc. from being supplied to the ground heat exchanger 30 together with the underground surface water, a sand remover ( 70) may be additionally provided. The sand remover 70 may include a sand removal net and a drain valve.

As shown in Figure 4, in the open type underground heat exchanger (1) according to an embodiment of the present invention, a plurality of rings to minimize the phenomenon that the water returned from the ground heat exchanger (30) overflows in the exchange well (20) It may further include a flow distribution pipe 80 for horizontally connecting the crystals to each other. The flow distribution pipe 80 is preferably installed about 30 cm above the inlet of the exchange water channel 60 connected to the upper part of the exchange well 30 . With this configuration, it is possible to minimize the overflow of water returned from the underground heat exchanger 30 to the plurality of exchange wells 20 during the exchange process, so that it is possible to maximize the exchange capacity of each exchange well.

Even when the flow distribution pipe 80 is installed, the returned water may overflow, so an overflow pipe 280 is installed on one side of the flow distribution pipe 80 in preparation for such a case, and the overflow pipe 280 ) may be connected to the collecting well 290 . The water introduced into the collecting well 290 may be returned to the ground through an appropriate route, and a detailed description thereof will be omitted.

Next, a heat exchange method of an open type underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention will be described.

First, in step S10, it is vertically inserted into a well of low depth of about 20 - 60 m, has a length of about 20 - 60 m, and the lower part (10L) from the lower end to about 2/3 height is a plurality of openings ( 130) and the upper part 10H from the point of about 2/3 height to the ground surface intakes underground surface water through a plurality of intake wells 10 formed in a cylinder without an opening.

Next, in the step (S20) of supplying the underground surface water to the above-ground heat exchanger (30), the underground surface water taken in in the water intake step (S10) is fed into the plurality of intake pipes (110) disposed inside the intake wells (10). And surface water at about 15° C. is supplied to the ground heat exchanger 30 through the deep well pumps 120 .

Next, in step S30, the underground surface water supplied to the ground heat exchanger 30 by the plurality of deep well pumps 120 is exchanged with a heat exchange medium circulating in the load side heat exchange circuit. In this process, a heat source of about ΔT 5°C is transferred from the underground surface water to the heat exchange medium on the load side and is supplied to the heat pump side.

Subsequently, in the return step (S40), the underground surface water having a temperature of about 10°C by heat exchange with the heat exchange medium of the load side heat exchange circuit in the heat exchange step (S30) is returned through the return pipe (20). The round well 20 is vertically inserted into a well of a low depth of about 20 to 60 m, and is alternately disposed with a predetermined distance from the plurality of intake wells 10, and has a length of about 20 to 60 m. The lower portion 20L from the lower end to the approximately 2/3 height point is formed as a perforated tube having a plurality of openings 230, and the upper portion 20H from the approximately 2/3 height point to the ground surface is formed as a cylinder without an opening. can The underground surface water returned through the exchange well 20 is discharged to the ground through the opening 230, and then the opening 130 of the intake well 10 is opened in a state where it is recovered to a temperature of about 15° C. by acquiring surface water heat again. is introduced through

Next, the construction of the intake well 10 and the exchange well 20 in an open geothermal system according to an embodiment of the present invention will be described with reference to FIGS. 7A to 7F .

First, referring to FIG. 7A, in order to make a well of a low depth of about 20 - 60 m in an area with abundant underground surface water but weak ground structure, such as alluvial layer, river vicinity, coastal zone, etc., a perforator operated by a compressor, etc. Excavated using a black steel pipe casing (outer casing) 150 with a diameter of 250 mm is installed up to the soil layer. At this time, the depth at which the black steel pipe casing is installed is preferably deeper than the water level of the underground surface water, and FIG. 7A exemplarily shows that the water level of the underground surface water is about 7 m. The black steel pipe casing performs a retaining function to prevent the soil around the excavation from collapsing when the intake well 10 or the exchange well 20 is installed. Then, a well of about 20 - 60 m is excavated using a drilling machine.

Next, referring to FIG. 7B , a metal casing (intake well) 10 having a diameter of 200 mm is installed in a well excavated to a depth of about 20 - 60 m. In the metal casing, the lower portion 10L from the lower end to the approximately 2/3 height point is formed of a perforated tube having a plurality of openings 130, and the upper portion 10H from the approximately 2/3 height point to the ground surface has no openings. It may be formed into a cylinder. The metal casing may be made of STS 304 material. The plurality of openings 130 may be formed of a plurality of through-holes or a plurality of slits, or may be formed of openings having different shapes.

Next, referring to FIG. 7C , the water intake pipe 110 and the deep well pump 120 are installed inside the intake well 10 , and a power line and a sensor cable are connected.

Next, referring to FIG. 7D , the cement grouting material 160 is injected into the space between the outer casing (black steel pipe casing) 150 and the intake well (metal casing) 10 , and is supplied to the intake pipe 110 . The furnace 50 is connected, and the power line is connected to the machine room.

The installation of the intake well 10 is completed by the process of FIGS. 7A to 7D.

On the other hand, in the case of the water-change water 20, the installation is completed by the process of Figures 7a, 7b and 7d. That is, since the installation process of the exchange well 20 is the same as the installation process of the intake well 10 except for the process of FIG. 7c , the description of the installation process of the exchange well 20 is omitted.

Next, referring to FIG. 7E , the supply passage 40 of the intake well 10 is connected to the ground heat exchanger 30 , and the return water passage 60 of the exchange well 20 is connected to the ground heat exchanger 30 . And, a flow distribution pipe (80) is connected between the plurality of exchange wells (20).

The installation of the open type underground heat exchanger using underground surface water as a heat source according to an embodiment of the present invention can be completed by the process of FIGS. 7A to 7E as described above, but this is exemplary and can be constructed by other construction methods of course there is

According to another embodiment of the present invention, the open type underground heat exchanger 1 using underground surface water as a heat source according to an embodiment of the present invention described above includes heat pumps 330 and 340 , an expansion tank 320 and a heat source circulation pump. It may be combined with the load side heat exchange circuit including the 310 to constitute a heating and cooling system. Here, in the load-side heat exchange circuit, for example, the fluid circulated through the plate heat exchanger (ground heat exchanger) 30 exchanges heat with the refrigerant in the heat pumps 330 and 340 and then flows into the plate heat exchanger 30 again. It can be achieved as a closed-loop cycle. The fluid circulating in the closed circuit may be water, and about 15% by weight of ethanol may be mixed to prevent freezing of the heat pumps 330 and 340 .

The air conditioning system using an open type underground heat exchanger using underground surface water as a heat source according to another embodiment of the present invention further includes a buffer tank 350 for storing hot or cold water (heat exchange medium) produced by the heat pumps 330 and 340. can do. For example, during the heating operation of the heating/cooling system, hot water (heat exchange medium) of about 50°C is discharged from the heat pump, and cold water (heat exchange medium) of about 7°C is discharged from the heat pump during the cooling operation, and the buffer tank 350 is discharged. Hot or cold water can be supplied to the load side via The buffer tank 350 is a type of heat storage tank, which stores hot or cold water produced by the heat pump. By buffering between the load side and the heat pump, it can respond to load fluctuations and prevent frequent start or stop of the heat pump. perform the function

Referring to FIG. 3 , the air conditioning system according to another embodiment of the present invention includes a heat source circulation pump 310 , an expansion tank 320 , and heat pumps 330 and 340 , and is circulated by the heat circulation pump 310 . The heat exchange medium to be used exchanges heat with underground surface water in the ground heat exchanger 30 , and exchanges heat with the refrigerant circulating in the heat pumps 330 and 340 in the heat pumps 330 and 340 . The refrigerant circulating inside the heat pumps (330, 340) circulates while repeating the change in state of liquid ↔ gas through a normal refrigeration cycle that goes through evaporation → compression → condensation → expansion. The implementation uses a known technique, and a detailed description thereof is omitted. In addition, the refrigerant circulating inside the heat pumps 330 and 340 is the heat pump 330 and 340 → the buffer tank 350 → the load-side indoor cooling and heating device (not shown) → the buffer tank 350 → the heat pump 330 , 340) and exchanges heat with the circulating heat exchange medium (water).

Here, when the heating and cooling system operates in the heating mode, for example, heat pumps 330 and 340 → buffer tank 350 → load-side indoor cooling and heating device (not shown) → buffer tank 350 → heat pump 330 , 340) is heated to about 50° C. by exchanging heat with the refrigerant circulating inside the heat pumps 330 and 340 and discharged from the heat pumps 330 and 340 to form the buffer tank 350. The heating operation may be performed by supplying hot water to the load-side indoor cooling/heating device. The heat exchange medium (water) heat-exchanged with indoor air in the load-side indoor cooling and heating device is transferred to the heat pumps 330 and 340 through the buffer tank 350 again.

In addition, when the heating and cooling system operates in the cooling mode, for example, heat pumps 330 and 340 → buffer tank 350 → load-side indoor cooling and heating device (not shown) → buffer tank 350 → heat pump 330, The heat exchange medium (water) circulating 340) exchanges heat with the refrigerant circulating inside the heat pumps 330 and 340, is cooled to about 7° C., and is discharged from the heat pumps 330 and 340 through the buffer tank 350 The cooling operation may be performed by supplying cold water to the load-side indoor cooling/heating device. The heat exchange medium (water) heat-exchanged with the indoor air in the load-side indoor cooling and heating device is transferred to the heat pumps 330 and 340 through the buffer tank 350 again.

According to the open type geothermal heat exchanger of an embodiment of the present invention made as described above, the underground surface water is removed from a plurality of intake wells with a low depth of about 20 to 60 m in an area where underground surface water is abundant, such as an area where the alluvial layer is developed, the coastline, and the vicinity of a river. After water intake and heat exchange in the ground heat exchanger, it can be exchanged into a plurality of exchange wells. Accordingly, since a sufficient amount of groundwater can be taken in by excavating at a low depth in the ground with a lot of surface water, it is not necessary to excavate and construct a well of about 200m to 500m deep as in the prior art. This simplification can shorten the construction period and reduce the construction cost. In addition, since the intake and return pipes are not installed inside one well, but the plurality of intake wells and the plurality of return wells are installed and used separately, sufficient heat is always obtained from the intake well while allowing groundwater to be returned to its original state without depleting it. be able to do

Although the present invention has been described with reference to the embodiments shown in the drawings, which are only exemplary, those of ordinary skill in the art to which the present invention pertains without departing from the scope of the technical spirit of the present invention from the description of the present specification It will be understood that various modifications, changes, substitutions, etc. are possible within the scope, and other equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention should not be limited to the above-described embodiments, but should be determined by the technical spirit of the claims to be described later as well as equivalents thereto.

1: Open type underground heat exchanger 10: Intake well
20: water change 30: ground heat exchanger
40: underground surface water supply passage 60: return water passage
70: sand remover 80: flow distribution pipe
110: water intake pipe 120: deep well pump
130, 230: opening 150, 250: outer casing
160, 260: seamet grouting material 280: overflow pipe
290: collecting well 310: heat source circulation pump
320: expansion tank 330, 340: heat pump
350: buffer tank

Claims (13)

delete In order to intake underground surface water, it is vertically inserted into a well of a low depth of 20 to 60 m, intake pipes of a predetermined length are disposed therein, and deep well pumps 120 are installed at the lower ends of the intake pipes 110 . and has a length of 20 - 60 m and the lower portion 10L from the lower end to the 2/3 height point is formed of a perforated pipe having a plurality of openings 130, and the upper portion 10H from the 2/3 height point to the ground surface is A plurality of intake wells (10) formed in a cylinder without an opening;
It is vertically inserted into a well of a low depth of 20 - 60 m, is alternately disposed with a predetermined distance from the plurality of intake wells 10, has a length of 20 - 60 m, and extends from the lower end to a 2/3 height point. The lower portion (20L) is formed of a perforated tube having a plurality of openings (230), and the upper portion (20H) from the 2/3 height point to the ground surface is a plurality of annular wells (20) formed in a cylinder without openings;
a ground heat exchanger (30) for exchanging the underground surface water sucked in by the deep well pumps (110) of the plurality of intake wells (10) and sent out with a heat exchange medium circulating in the load side heat exchange circuit;
a plurality of supply paths (40) connecting the outlets of the intake pipes of the plurality of intake wells (10) and the inlets of the above-ground heat exchanger (30);
A distributor connected to the outlets through which the ground surface water exchanged with the heat exchange medium circulating on the load side in the above-ground heat exchanger 30 is discharged:
a plurality of exchange channels 60 connecting the inlets of the plurality of exchange wells 20 from the distributor; and
It includes a sand remover (70) including a sand removal net and a drain valve and provided in the plurality of supply paths (40).
The plurality of intake wells 10 and the plurality of exchange water wells 20 are alternately arranged in a line,
A plurality of cylindrical outer casings 150 and 250 are installed on the outer periphery of the upper portion 10H of the plurality of intake wells 10 and the upper portion 20H of the plurality of exchange wells 20, respectively, and the plurality of intake wells ( 10) and the space between the plurality of outer casings 150 and the space between the plurality of exchange water wells 20 and the plurality of outer casings 250, the cement grouting materials 160 and 260 are injected.
An open type underground heat exchanger that uses underground surface water as a heat source.
3. The method of claim 2,
The plurality of intake water wells (10) and the plurality of round water wells (20) are arranged in a plurality of rows of rectangles.
An open type underground heat exchanger that uses underground surface water as a heat source.
4. The method of claim 3,
The intake well (10) and the exchange well (20) are disposed with an interval of 15 m
An open type underground heat exchanger that uses underground surface water as a heat source.
delete 3. The method of claim 2,
The plurality of openings 130 provided in the lower portion of the intake well 10 are formed of a plurality of through holes or a plurality of slits.
An open type underground heat exchanger that uses underground surface water as a heat source.
delete 3. The method of claim 2,
Further comprising a flow distribution pipe 80 for horizontally connecting a plurality of exchange wells to each other so as to minimize the phenomenon that water returned from the ground heat exchanger 30 overflows in the exchange well 20
An open type underground heat exchanger that uses underground surface water as a heat source.
3. The method of claim 2,
In the plurality of exchange wells 20 , a plurality of overflow pipes 280 are installed above the inlets of the plurality of exchange channels 60 , and the plurality of overflow pipes 280 are connected to a collecting well 290 . felled
An open type underground heat exchanger that uses underground surface water as a heat source.
The open type underground heat exchanger (1) according to claim 2 is formed by being combined with a load side heat exchange circuit including a heat pump, an expansion tank, and a heat source circulation pump.
A heating and cooling system using an open type underground heat exchanger using underground surface water as a heat source.
11. The method of claim 10,
Further comprising a buffer tank 350 for storing the hot water produced by the heat pump
A heating and cooling system using an open type underground heat exchanger using underground surface water as a heat source.
delete delete

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