KR102155016B1 - Geothermal heat pump system with recycling tank and easy sludge removal - Google Patents

Abstract

The present invention relates to a geothermal heat pump system in which a recycling tank is provided and sludge is easily removed. The geothermal heat pump system includes an open underground heat exchanger; Heat pump; Supply channel; A first recovery passage 40 and a second recovery passage 50; Recycling tank; Including, the inside of the recycling tank is filled with a phase change material (PCM) causing a phase change in a temperature range of 10 ~ 25 ℃, the open-type underground heat exchanger is inserted into the tube well and a casing having a groundwater inlet at the bottom ; A deep well pump inserted into the casing to pump groundwater; A groundwater supply pipe connected to the supply passage to supply groundwater pumped by the deep well pump to a heat pump; A return pipe inserted into the casing near the groundwater inlet to return the groundwater heat-exchanged by the heat pump to the inside of the well; An auxiliary pipe inserted into the return pipe and extending downward from the end of the return pipe to the bottom surface of the casing; Including, a plurality of auxiliary openings are formed to be spaced apart at predetermined intervals at a lower end of the auxiliary pipe, an air pump and a suction pump are connected to the auxiliary pipe, and the air pump receives high-pressure air through the auxiliary opening. Discharge and disturb the sludge accumulated under the casing, and the suction pump sucks and removes the disturbed sludge through the auxiliary opening.
According to this configuration, a geothermal heat pump system is provided with a recycling tank that easily removes sludge flowing into the casing and accumulates under the casing and prevents the rise of sludge to prevent damage to the deep well pump and extend its lifespan. Can provide.

Description

Geothermal heat pump system with recycling tank and easy sludge removal, equipped with a recycling tank and easy sludge removal

The present invention relates to a geothermal heat pump system in which a recycling tank is provided and sludge is easily removed.

Recently, as carbon dioxide emissions from fossil energy have emerged as a global environmental problem, various methods have been developed to reduce the use of fossil energy, and as part of this, a geothermal heat pump system that receives energy required for cooling and heating buildings from geothermal heat has been developed. Is being used.

Geothermal heat pump systems can be divided into closed system and open (or well tube) system.

The sealed geothermal heat pump system excavates the stratum from several tens of meters to a depth of about 150 m, installs a fluid circulation pipe in the excavation section, and installs a circulating fluid such as antifreeze in the ground, and a heat exchanger installed on the ground. It is a system that obtains geothermal heat by moving and circulating between them.

The open geothermal heat pump system is a system that obtains geothermal heat by installing a submersible motor pump and moving and circulating the groundwater to a heat exchanger installed on the ground after developing a groundwater intake hole that produces a certain amount of groundwater by excavating the stratum to a depth of several hundred meters. .

It is known that the open geothermal heat pump system using groundwater in direct contact with the groundwater in the ground as a circulation medium has much better thermal efficiency than the closed geothermal heat pump system in which antifreeze or the like circulates in the fluid circulation pipe and indirectly contacts the geothermal heat.

Geothermal heat pump systems generally include an underground heat exchanger, a circulation pump, a heat pump, and a connection pipe, and in the heat pump, heat energy is supplied from a heat source side (primary side) through a heat medium and transmitted to a secondary side (user side).

Depending on the type of heat medium, the water to air (WTA) type geothermal heat pump system uses air as the secondary heat exchange medium, so a heat storage tank is generally installed on the primary side to store unused energy. It is configured to perform heat exchange with the heat exchange medium on the vehicle side.

However, if the heat storage tank is installed on the primary side to store unused energy, the circulation pump for circulating the heat exchange medium to the primary side must be continuously operated, and there is a large difference in the amount of heat stored in the heat storage tank depending on the temperature of the ground. There is a problem that it is difficult to ensure operational efficiency.

Therefore, in a geothermal heat pump system in which a heat storage tank is installed on the primary side, it is required to develop a geothermal heat pump system that is economical and can ensure high utilization efficiency of unused energy.

In addition, the conventional open geothermal heat pump system inserts a casing into the well and pumps the groundwater accumulated in the well with a deep well pump, supplies it to a heat exchanger through a supply pipe for heat exchange, and then administers it back into the well through a return pipe. To repeat the cycle. A plurality of inlets through which groundwater flows into the casing are formed in the lower part of the casing.

However, in the conventional open geothermal heat exchange system, the circulating water flowing from the return pipe between the outside of the casing and the wall of the well descends along the wall of the well, destroying the walls of the aquifer and the weak well, and causing a lot of sludge.

Such sludge accumulates on the bottom of the well, and in severe cases, it reaches the deep well pump, deteriorating the quality of the groundwater, and sometimes the deep well pump is damaged.

In addition, the sludge that accumulates excessively in the well is easily introduced into the submersible motor pump along with the groundwater, causing abrasion of the deep well pump or causing obstacles to rotation, causing failure.

Korean Patent Registration No. 10-1403041

Therefore, the present invention was invented in view of the above circumstances, and in a geothermal heat pump system in which a heat storage tank is installed on the primary side, it is possible to appropriately respond to fluctuations in the heating and cooling load, and also economically and increasing the cooling and heating efficiency by utilizing unused heat energy. It provides a geothermal heat pump system equipped with a recycling tank that easily removes the sludge flowing into the casing and accumulates at the bottom and prevents the rise of the sludge to prevent damage to the deep well pump and extends its lifespan. There is a purpose in wanting.

A geothermal heat pump system for supplying heat energy required for cooling and heating using a heat exchanger installed in the ground according to the present invention for realizing the above object includes: an open ground heat exchanger installed in the ground; A heat pump for supplying cooling and heating energy to the user's cooling and heating system; A supply passage connected between the open underground heat exchanger and the inlet of the heat pump; One end is connected to the outlet of the heat pump, and the other end is installed inside the open-type underground heat exchanger to recover the primary side heat medium that has passed through the heat pump to the open-type underground heat exchanger. A recovery passage 50; A recycling tank installed in the first recovery passage 40 to absorb and store residual heat of the primary heat medium; Including, the inside of the recycling tank is filled with a phase change material (PCM) causing a phase change in a temperature range of 10 ~ 25 ℃, the open-type underground heat exchanger is inserted into the pipe well and a casing having a groundwater inlet at the bottom ; A deep well pump inserted into the casing to pump groundwater; A groundwater supply pipe connected to the supply passage to supply groundwater pumped by the deep well pump to a heat pump; A return pipe inserted into the casing near the groundwater inlet to return the groundwater heat-exchanged by the heat pump to the inside of the well; An auxiliary pipe inserted into the return pipe and extending downward from the end of the return pipe to the bottom surface of the casing; Including, a plurality of auxiliary openings are formed to be spaced apart at a predetermined interval at a lower end of the auxiliary pipe, an air pump and a suction pump are connected to the auxiliary pipe, and the air pump receives high-pressure air through the auxiliary opening. Discharge and disturb the sludge accumulated under the casing, and the suction pump sucks and removes the disturbed sludge through the auxiliary opening.

In addition, an external auxiliary pipe rotatably connected to the auxiliary pipe independently through a bearing on the lower outside of the auxiliary pipe; A plurality of fans extending outward of the external auxiliary pipe are formed to be spaced apart downward in the external auxiliary pipe, and a second auxiliary opening communicating with the auxiliary opening is formed in the external auxiliary pipe, and the fan An air guide tube extending toward the side is formed, and high-pressure air discharged through the auxiliary opening is discharged toward the fan through the air guide tube, thereby rotating the fan.

In addition, the external auxiliary pipe extends to the end of the auxiliary pipe, and at the lower end of the external auxiliary pipe, a plurality of air outlets extending outward of the external auxiliary pipe in a transverse direction and directed downward are formed to be spaced apart at predetermined intervals. An air discharge pipe is formed, so that high-pressure air may be discharged downward through the plurality of air discharge ports.

According to the present invention, in a geothermal heat pump system in which a heat storage tank is installed on the primary side, it is possible to appropriately respond to fluctuations in the cooling and heating load, and by utilizing unused heat energy, economical and heating efficiency can be increased. It is possible to provide a geothermal heat pump system that is equipped with a recycling tank that easily removes the sludge accumulated in the soil and prevents the rise of sludge, thereby preventing damage to the deep well pump and extending the lifespan, and facilitating sludge removal.

1 is a block diagram of a geothermal heat pump system equipped with a recycling tank according to an embodiment of the present invention.
2 to 4 are operational state diagrams showing an example in which a geothermal heat pump system equipped with a recycling tank according to the present invention is operated.
5 is a diagram showing the configuration of an open underground heat exchanger according to an embodiment of the present invention.
6 is a diagram showing in detail a configuration for disturbing sludge in FIG. 5.
7 is a view showing a state in which high-pressure air is discharged by the air pump in FIG. 6.
8 is a view showing a state in which sludge disturbed by the suction pump in FIG. 7 is sucked.
9 is a diagram showing a configuration for disturbing sludge according to another embodiment of the present invention.

Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference numerals to elements of each drawing, it should be noted that only the same elements are marked with the same numerals as possible, even if they are indicated on different drawings.

1 is a block diagram of a geothermal heat pump system equipped with a recycling tank according to an embodiment of the present invention. 2 to 4 are operational state diagrams showing an example in which a geothermal heat pump system equipped with a recycling tank according to the present invention is operated.

The geothermal heat pump system of the present invention includes an open underground heat exchanger 10, a heat pump 20, a supply channel 30, a first recovery channel 40, a second recovery channel 50, and a first pump 60A. , A recycling tank 70 and a controller 80.

The open-type underground heat exchanger 10 is installed in the ground to supply underground heat to the heat pump 20 through a heat medium and may be formed in plural.

In the building, a heat pump 20 connected to the open ground heat exchanger 10 is installed to cool the secondary heat medium by heat exchange between the heat medium (groundwater) on the primary side (heat source side) and the heat medium on the secondary side (user side). It heats and supplies energy required for cooling and heating.

In order to achieve this function, one side of the heat pump 20 is provided with an inlet 21 and an outlet 22 for supplying and discharging the primary heat medium. The inlet 21 is connected to an open underground heat exchanger 10 and a supply passage 30 for supplying the heat medium with heat exchange to the heat pump 20, and the outlet 22 is a first recovery passage 40 or a first 2 It is connected to the open type underground heat exchanger 10 through the recovery passage 50, whereby the heat medium is recovered to the open type underground heat exchanger 10.

The other side of the heat pump 20 is connected to a heat medium pipe 1 connected to an air conditioner or the like.

Between the open underground heat exchanger 10 and the heat pump 20, a supply passage 30 and a first recovery passage 40 are respectively installed so that the heat medium on the primary side is supplied and discharged to the heat pump 20. One or more first pumps 60A are installed in parallel in the supply passage 30, and a recycling tank 70 and a flow control valve V, which will be described later, are installed in the first recovery passage 40, respectively.

Between the recycling tank 70 and the supply passage 30, an auxiliary passage 30' connecting them is installed, and in the auxiliary passage 30', a second pump 60B is installed in parallel with the first pump 60A. Can be installed.

The first recovery passage 40 is provided with a flow rate control valve V to control the flow rate of the primary heat medium recovered to the open ground heat exchanger 10 via the recycling tank 70.

In the present invention, if necessary, by bypassing the recycling tank 70 so that the primary heat medium discharged from the heat pump 20 can be directly introduced into the open underground heat exchanger 10 without passing through the recycling tank 70 A second recovery passage 50 directly connecting the pump 20 and the open underground heat exchanger 10 is installed. To this end, a three-way valve is installed in the pipe connected to the outlet 22 of the heat pump 20, and the heat medium is controlled by the controller 80 through the first return channel 40 or the second return channel 50. It is recovered toward the open underground heat exchanger (10).

A recycling tank 70 is installed on the first recovery passage 40, and this recycling tank 70 is applied to the primary heat medium when the primary heat medium passed through the heat pump 20 is recovered by the open ground heat exchanger 10. The remaining heat (unused heat energy) is absorbed and stored, and the stored heat energy is transferred to the primary heat medium when a specific temperature condition is reached, and the primary heat medium receiving this heat energy is a heat pump again without going through the open ground heat exchanger (10). It functions to supply (20).

The recycling tank 70 is formed in a tank shape with an accommodation space formed therein, and an inlet 71 for introducing the primary heat medium flowing through the first recovery passage 40 is provided at an upper side of one side, and at the lower side of the other side. Is provided with a first outlet 72 for recovering the heat medium from the primary side to the open ground heat exchanger 10 through the first recovery passage 40, and the primary side flowing into the inside of the recycling tank 70 at the bottom. A second outlet 73 for supplying the heat medium of the heat to the heat pump 20 through the auxiliary flow path 30 ′ is provided. The inside of the tank 70 is filled with phase change materials (PCM) that cause a phase change according to temperature. The recycling tank 70 may have a dual structure in which an insulation material is installed outside or a separate inner tank 70' is installed inside.

The phase change material is selected and used among known phase change materials that cause a phase change in the temperature range of 10 to 25°C in consideration of the temperature of the heat medium recovered by heat exchange with the primary heat medium, and preferably at a temperature of 10 to 25°C. During a phase change within the range, n-Hexadecane (eg, PARAFOL 16 to 97) having a higher latent calorific value (231 kJ/kg) than other types of phase change materials may be used.

By filling the phase change material (PCM) in the recycling tank 70 in this way, the primary heat medium is recovered to the open ground heat exchanger 10 through the first recovery channel 40 by the control of the controller 80. When passing through the recycling tank 70, unused heat energy is absorbed and stored by the phase change material, and the heat energy absorbed and stored by the phase change material is supplied back to the heat pump 20 to heat or cool the primary heat medium. It is used for heating the water stored in the hot water supply tank 90 by being supplied to the hot water supply tank 90 to be described later.

In this way, when the heat medium on the primary side is controlled to be supplied to the heat pump 20 again from the recycling tank 70 without passing through the open underground heat exchanger 10, the heat medium on the primary side smoothly circulates with only the second pump 60B. Therefore, compared to the case of using the first pump (60A) to supply the heat medium from the open underground heat exchanger (10) to the heat pump (20), the circulation flow path of the heat medium is shortened and a pump having a much smaller capacity is used. Effective energy saving is achieved because it can be used.

On the side of the heat pump 20, a controller 80 is installed to control the operation of the three-way valve, the first and second pumps 60A and 60B, and the flow control valve V, and the controller 80 includes 2 The first pump 60A and the second pump 60B are selectively operated in accordance with the set temperature of the air conditioner on the vehicle side, and heat energy required for cooling and heating is supplied to the secondary side.

At this time, the controller 80 selects and switches the flow path according to the amount of heating and cooling heat required from the secondary side and the temperature of the recycling tank 70. To this end, the controller 80 compares the internal temperature T1 of the recycling tank 70 with the outlet temperature T2 of the open underground heat exchanger 10 through a temperature sensor (not shown), thereby cooling and heating the secondary side. As the heat source to supply the heat energy required for the open type underground heat exchanger 10 or the recycling tank 70 is selected.

In the case of cooling operation, as shown in FIG. 2, when comparing the temperatures (T1, T2) detected by the temperature sensors, respectively, the temperature (T1) inside the recycling tank 70 is the open type underground heat exchanger 10 ), the first pump (60A) is operated so that the primary heat medium is supplied to the heat pump (20) along the supply passage (30), and then recycled through the first recovery passage (40). The temperature change of the recycling tank 70 is continuously monitored while being recovered to the open underground heat exchanger 10 via the tank 70.

Thereafter, when the temperature T1 of the recycling tank 70 is in the temperature range of 15 to 18°C, the operation of the first pump 60A is stopped and installed in the auxiliary flow path 30' as shown in FIG. The flow path is switched so that the heat medium on the primary side is supplied to the heat pump 20 without passing through the open underground heat exchanger 10 by operating the second pump 60B and operating the three-way valve. Accordingly, the primary heat medium is cooled by heat exchange with the phase change material (PCM) of the recycling tank 70 to supply heat energy required for cooling, and the controller continuously monitors the temperature change of the recycling tank 70 do.

And when the internal temperature (T1) of the recycling tank (70) is 25°C or higher or equal to or higher than the temperature (T2) of the open underground heat exchanger (10), the second pump (60B) is operated by the control of the controller (80). The flow path is switched so that the first heat medium is circulated through the open type underground heat exchanger 10 and the heat pump 20 while the first pump 60A is operated again.

By this operation method, the present invention can selectively operate any one of the first and second pumps 60A and 60B for circulating the heat medium, and as a result, the recycling tank without using the open ground heat exchanger 10 Thermal energy required for cooling and heating can be supplied by using the thermal energy stored in 70, so that electric energy required to operate the first pump 60A having a relatively large capacity can be saved.

During the heating operation, when the internal temperature T1 of the recycling tank 70 is 25°C or higher, contrary to the cooling operation, the primary heat medium is circulated through the heat pump 20 and the recycling tank 70 under the control of the controller. It is controlled, and when the internal temperature (T1) of the recycling tank 70 is in a temperature range of 15 to 18° C., the primary heat medium is controlled to circulate the open underground heat exchanger 10 and the heat pump 20.

As shown in FIG. 4, when the temperature (T1) inside the recycling tank 70 is 25°C or higher during the heating operation, the primary heat medium is switched to the open ground heat exchanger through the second recovery channel 50. (10), and if hot water is needed, the primary heat medium is supplied to the inside of the hot water supply tank 90 through the hot water connection pipe 91 so that hot water can be supplied to the hot water supply tank 90. Hot water is supplied to the user side, and when the temperature (T1) inside the recycling tank 70 is 15 to 18°C, the flow path is switched again so that the heat medium on the primary side passes through the first recovery channel 40 to the recycling tank 70 It is controlled to circulate via ).

As described above, in the geothermal heat pump system equipped with the recycling tank of the present invention, the heat medium is selectively cooled or heated through the recycling tank 70 and supplied to the heat pump 20, thereby appropriately responding to fluctuations in the cooling and heating load. Since unused heat energy can be more effectively used through the recycling tank 70 filled with the change material, energy use efficiency can be greatly increased.

5 is a diagram showing the configuration of an open underground heat exchanger according to an embodiment of the present invention. 6 is a diagram showing in detail a configuration for disturbing sludge in FIG. 5. 7 is a view showing a state in which high-pressure air is discharged by the air pump in FIG. 6. 8 is a view showing a state in which sludge disturbed by the suction pump in FIG. 7 is sucked.

5 and 6, the open type underground heat exchanger 100 is for circulating groundwater accumulated in the well 110 to exchange geothermal heat with the heat pump 20, the well 110, the casing 120, It includes a deep well pump 130, a groundwater supply pipe 140, and a return pipe 160.

The pipe well 110 is constructed up to several hundred m underground with little change in temperature. The upper part of the well 110 is sealed with a cover 111 to block the inflow of contaminants from the ground. Bean gravel 112 is inserted into the space between the casing 120 and the return pipe 160 in the tube well 110.

The topsoil layer (from the surface of the ground to the rock layer) is grouted with cement or bentonite to prevent contamination of the ground from permeating, and the upper cover 111 may be replaced with a clean cap. The cover 111 has the same standard as the casing 110 and is installed in a separate type so that it can be easily replaced in case of failure of the deep well pump 130, and also stably protects the groundwater supply pipe 140 and the return pipe 160 It also plays a supporting role.

Bean gravel 112 prevents the wall of the well 110 from collapsing due to the groundwater in the aquifer, and allows the groundwater to flow smoothly, while reducing the occurrence of sludge (S) inside the casing 120, and into the casing 120 Let clean water flow in. The size (particle size) of the bean gravel 112 is suitable about 3 to 10mm, and sand may be added to the bean gravel 112 as necessary.

The casing 120 is inserted into the well 110 to isolate the groundwater circulating through the groundwater supply pipe 140 and the return pipe 160 and the groundwater flowing into the well 110 from the basement. The casing 120 may be made of a PVC pipe or a metal pipe of various materials that does not rust may be used.

A plurality of groundwater inlets 121 are formed in the lower portion of the casing 120 from a predetermined height H to the upper side from the bottom of the casing 120. Groundwater absorbing the geothermal heat flows into the casing 120 through the groundwater inlet 121 from the well 110.

The deep well pump 130 is a submersible pump inserted into the casing 120 to pump groundwater flowing into the casing 120 and is connected to the lower end of the groundwater supply pipe 140.

The groundwater supply pipe 140 is a pipe that supplies groundwater pumped by the deep well pump 130 to the heat pump 20.

The return pipe 160 is a pipe that returns the groundwater heat-exchanged by the heat pump 20 into the casing 120. The return pipe 160 is disposed in the space between the wall of the well 110 and the casing 120 and is inserted into the casing 120 near the groundwater inlet 121 of the casing 120 (above the groundwater inlet). , The end of the return tube 160 may form a bent portion 161 that is bent toward the upper side of the casing 120.

Groundwater flowing into the pipe well 110 from the basement is purified while passing through the space filled with the bean gravel 112 and the generation of sludge S is reduced, and is introduced into the casing 120 through the groundwater inlet 121.

Sludge (S) from the groundwater flowing into the casing 120 is stored and accumulated on the bottom of the casing 120, and the groundwater in the upper side of the casing 120 is groundwater supply pipe 140 by the operation of the deep well pump 130. ) Is supplied to the heat pump 20 through the heat exchanger and then moved to the lower portion of the casing 120 through the return pipe 160.

The groundwater returned through the return pipe 160 moves as heat exchanges with the groundwater seeping into the bean gravel 112 inside the pipe well 110, and the casing 120 near the groundwater inlet 121 (above the groundwater inlet). ) And continues circulation.

The auxiliary pipe 170 is inserted into the return pipe 160 to remove (clean) the sludge S and extends downward from the end of the return pipe 160 to the bottom surface of the casing 120. A plurality of auxiliary openings 171 are formed in the lower end of the auxiliary pipe 170 to be spaced apart at predetermined intervals.

An air pump 162 and a suction pump 163 are connected to the auxiliary pipe 170. The air pump 162 discharges high-pressure air through the auxiliary opening 171 to disturb the sludge (S) accumulated under the casing 120, and the suction pump 163 is disturbed through the auxiliary opening 171. Sludge (S) is sucked and removed.

An external auxiliary pipe 180 is connected to the lower outer side of the auxiliary pipe 170 so as to be rotatable independently from the auxiliary pipe 170 through a bearing 181.

A fan 183 extending laterally to the outside of the external auxiliary pipe 180 is attached to the external auxiliary pipe 180, and a plurality of such fans 183 are spaced downward along the external auxiliary pipe 180. Is formed.

An air guide pipe 182 extending toward the fan 183 is formed in the external auxiliary pipe 180. A second auxiliary opening 182a communicating with the auxiliary opening 171 is formed in the air guide pipe 182, so that the high-pressure air discharged through the auxiliary opening 171 is a second auxiliary opening of the air guide pipe 182 It may be discharged toward the fan 183 through (182a). The high-pressure air discharged toward the fan 183 pressurizes the fan 183 to rotate the fan 183 while the external auxiliary pipe 180 is rotated with respect to the auxiliary pipe 170.

When the fan 183 rotates by a predetermined angle and the external auxiliary pipe 180 rotates with respect to the auxiliary pipe 170, the auxiliary opening 171 and the second auxiliary opening 182a may not communicate with each other. In this case, since it is difficult for air to be discharged through the second auxiliary opening 182a, the auxiliary opening 171 and the second auxiliary opening 182a are respectively along the circumferences of the auxiliary pipe 170 and the external auxiliary pipe 180. A plurality of pieces are formed by being spaced apart at a predetermined angle, so that a force to rotate the fan 183 is continuously generated.

When the fan 183 is rotated, a vortex may be formed to effectively disturb the sludge S accumulated under the casing 120.

The external auxiliary pipe 180 extends to an end of the auxiliary pipe 170, and an air discharge pipe 185 extending laterally to the outside of the external auxiliary pipe 180 is formed at a lower end of the external auxiliary pipe 180. The air discharge pipe 185 communicates with the discharge opening 172 formed in the auxiliary pipe 170. The discharge opening 172 is formed entirely along the circumference of the auxiliary pipe 170, and the discharge opening 172 may communicate with the air discharge pipe 185.

In the air discharge pipe 185, a plurality of air discharge ports 185a directed downward are formed to be spaced apart at predetermined intervals. The high-pressure air may be discharged downward through the air pump 162 through the plurality of air outlets 185a, thereby more effectively disturbing the sludge S accumulated at the bottom of the casing 120.

An optical sensor 190 is attached between the external auxiliary pipe 180 and the inner wall of the casing 120, so that the degree of accumulation of the sludge S in the lower portion of the casing 120 can be checked. A plurality of optical sensors 190 are attached to be spaced apart along the longitudinal direction of the external auxiliary pipe 180, so that light from the optical sensor 190 of the external auxiliary pipe 180 is attached to the casing 120 ( If it does not reach 190), it can be confirmed that sludge (S) has accumulated to that height. The optical sensor 190 may be configured as an illuminance sensor to check the degree of accumulation of sludge S by illuminance.

The controller can check the degree of accumulation of the sludge S by the optical sensor 190 and operate the air pump 162 and the suction pump 163 to clean the sludge S under the casing 120.

A magnet 195 is positioned in the auxiliary pipe 170 and the external auxiliary pipe 180, respectively, so that the auxiliary opening 171 and the second auxiliary opening 182a communicate with each other. When the external auxiliary pipe 180 rotates with respect to the auxiliary pipe 170 by a predetermined angle, the auxiliary opening 171 and the second auxiliary opening 182a may not communicate with each other. At this time, when electricity is supplied to the magnet 195, the auxiliary opening 171 and the second auxiliary opening 182a by the attractive force between the auxiliary pipe 170 and the magnet 195 attached to the external auxiliary pipe 180, respectively. The external auxiliary pipe 180 may be rotated to communicate with each other.

FIG. 7 shows a state in which the air pump 162 is operated, and the high pressure air is discharged through the auxiliary opening 171 and the second auxiliary opening 182a so that the fan 183 rotates.

The air discharged through the second auxiliary opening 182a rotates the fan 183, and the air discharged through the air outlet 185a applies force to the sludge S at the bottom of the casing 120. Accordingly, the sludge (S) accumulated in the casing 120 is disturbed and is in a good state for suction by the suction pump 163.

FIG. 8 shows a state in which the suction pump 163 is operated after disturbing the sludge S and discharges the disturbed sludge S to the outside through the auxiliary pipe 170.

In order to communicate the auxiliary opening 171 and the second auxiliary opening 182a, when electricity is supplied to the magnet 195, the auxiliary opening 171 and the second auxiliary opening 182a are formed by the attraction of the magnet 195. The external auxiliary pipe 180 is rotated to communicate with each other, so that the sludge S may be sucked through the second auxiliary opening 182a and the auxiliary opening 171. In addition, sludge S may be sucked through the air outlet 185a.

9 is a diagram showing a configuration for disturbing sludge according to another embodiment of the present invention.

In this embodiment, an external auxiliary pipe 180 is connected to the lower outer side of the auxiliary pipe 170 so as to be rotatable independently from the auxiliary pipe 170 through a bearing 181. A plurality of these external auxiliary pipes 180 are connected to the auxiliary pipe 170 through a bearing 181 to be spaced apart along the longitudinal direction of the auxiliary pipe 170.

Each of the external auxiliary pipes 180 is attached with a fan 183 extending laterally to the outside of the external auxiliary pipe 180, and an air guide pipe 182 extending toward the fan 183 is formed. A second auxiliary opening 182a communicating with the auxiliary opening 171 is formed in the air guide pipe 182, so that the high-pressure air discharged through the auxiliary opening 171 is a second auxiliary opening of the air guide pipe 182 It may be discharged toward the fan 183 through (182a).

When high-pressure air is discharged toward the fan 183 through the second auxiliary opening 182a, each of the external auxiliary pipes 180 can be individually rotated with respect to the auxiliary pipe 170, which is an external auxiliary pipe ( It is possible to more effectively disturb the sludge (S) accumulated in the lower portion of the casing 120 by forming a larger vortex than the one formed by 180).

A magnet 195 is positioned in the auxiliary pipe 170 and the external auxiliary pipe 180, respectively, so that the auxiliary opening 171 and the second auxiliary opening 182a communicate with each other. When electricity is supplied to the magnet 195, the auxiliary opening 171 and the second auxiliary opening 182a communicate with each other by the attractive force between the auxiliary pipe 170 and the magnet 195 attached to the external auxiliary pipe 180, respectively. The external auxiliary pipe 180 may be rotated so that it is possible.

In this embodiment, a plurality of external auxiliary pipes 180 are connected to be spaced apart along the longitudinal direction of the auxiliary pipes 170, so that the external auxiliary pipes 180 can be individually rotated so that the lower portion of the casing 120 is further It makes it possible to form a large vortex.

It is obvious to those of ordinary skill in the art that the present invention is not limited to the above embodiments and can be implemented with various modifications or modifications within the scope not departing from the technical gist of the present invention. will be.

10: open underground heat exchanger
20: heat pump
30: supply flow
40: first recovery channel
50: 2nd recovery channel
60A: first pump
70: recycling tank
80: controller
110: official
120: casing
130: deep well pump
140: groundwater supply pipe
160: return tube
170: auxiliary pipe
171: auxiliary opening
172: discharge opening
180: external auxiliary pipe
181: bearing
182: air guide tube
182a: second auxiliary opening
183: fan
185: air exhaust pipe
185a: air outlet
190: optical sensor
195: magnet

Claims (3)

In a geothermal heat pump system that supplies heat energy required for heating and cooling by using a heat exchanger installed in the ground,
An open underground heat exchanger installed in the ground;
A heat pump for supplying cooling and heating energy to the user's cooling and heating system;
A supply passage connected between the open underground heat exchanger and the inlet of the heat pump;
One end is connected to the outlet of the heat pump, and the other end is installed inside the open-type underground heat exchanger to recover the primary side heat medium that has passed through the heat pump to the open-type underground heat exchanger. A recovery passage 50;
A recycling tank installed in the first recovery passage 40 to absorb and store residual heat of the primary heat medium;
Including,
The inside of the recycling tank is filled with a phase change material (PCM) that causes a phase change in a temperature range of 10 to 25°C,
The open underground heat exchanger,
A casing inserted into the well and having a groundwater inlet at the bottom;
A deep well pump inserted into the casing to pump groundwater;
A groundwater supply pipe connected to the supply passage to supply groundwater pumped by the deep well pump to a heat pump;
A return pipe inserted into the casing near the groundwater inlet to return the groundwater heat-exchanged by the heat pump to the inside of the well;
An auxiliary pipe inserted into the return pipe and extending downward from the end of the return pipe to the bottom surface of the casing;
An external auxiliary pipe rotatably connected to the auxiliary pipe independently through a bearing on the lower outside of the auxiliary pipe;
Including,
A plurality of auxiliary openings are formed to be spaced apart at predetermined intervals at the lower end of the auxiliary pipe,
An air pump and a suction pump are connected to the auxiliary pipe,
The air pump discharges high-pressure air through the auxiliary opening to disturb the sludge accumulated under the casing, and the suction pump sucks and removes the disturbed sludge through the auxiliary opening,
In the external auxiliary pipe, a plurality of fans extending outward of the external auxiliary pipe are formed to be spaced downwardly,
The external auxiliary pipe is formed with a second auxiliary opening communicating with the auxiliary opening to form an air guide tube extending toward the fan,
A geothermal heat pump system capable of rotating the fan by discharging the high-pressure air discharged through the auxiliary opening toward the fan through the air guide pipe. delete The method of claim 1,
The external auxiliary pipe extends to the end of the auxiliary pipe,
At the lower end of the external auxiliary pipe, an air discharge pipe extending in a transverse direction to the outside of the external auxiliary pipe and having a plurality of air discharge ports directed downward is formed to be spaced apart at predetermined intervals, and high pressure is applied through the plurality of air discharge ports. Geothermal heat pump system that allows air to be discharged downward.

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