JP2010117081A - Underground water heat exchange method and underground water heat exchange device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground water heat exchange method and an underground water heat exchange device enabling efficient heat use and heat exchange by the use of underground water heat. <P>SOLUTION: A movable separator 4 for vertically separating inside of a casing 1 is vertically movably arranged within the casing 1 inside a well, and a lower pipe 6 and an upper pipe 7 are inserted to inside of the casing 1. An upper screen 2 is formed in the upper casing 1 of the movable separator 4, and a lower screen 3 is formed in the lower casing 1 of the movable separator 4. When the water injection amount from an upper chamber 16 within the casing 1 is decreased, or periodically, a pumping function of the lower pipe 6 and an injection function of the upper pipe 7 are switched to each other, and water is pumped up from the upper chamber 16 within the upper casing 1 of the movable separator 4 via the upper pipe 7. Underground water after heat use is injected to a lower chamber 15 within the lower casing 1 of the movable separator 4 via the lower pipe 6 and is returned to the ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a groundwater heat exchanging method and a groundwater heat exchanging apparatus for exchanging heat for cooling and heating, snow melting and the like by circulating groundwater in one well and using groundwater heat therebetween.

  Since the temperature of groundwater is generally constant throughout the year, it has been conventionally practiced to excavate a pumping well and use the groundwater pumped from the pumping well for air conditioning and snow melting of a building. In conventional devices using this type of groundwater heat, the groundwater after heat use is usually discharged into a river or the like, or two wells are excavated and groundwater is pumped from one pumping well, and a heat pump or After heat exchange by free cooling, it was used to return to the other well.

  However, such a groundwater heat exchange device requires drainage costs or needs to drill two wells, so it cannot be installed if there is not enough space for installation, There was a problem that the drilling cost was high. In addition, due to clogging of the screen installed in the well, there was a problem that the amount of pumped water decreased or water injection could not be performed.

Therefore, conventionally, a single well is used to pump groundwater, the pumped groundwater is supplied to a heat pump, etc., heat exchange is performed, and used water is returned to the well casing again. Japanese Patent Application Laid-Open No. 2004-228561 proposes a groundwater heat exchange device that performs the following.
JP 2004-317102 A

  In this type of conventional groundwater heat exchange device, a casing is inserted into one excavated well, and water is pumped from the aquifer at the bottom of the casing, while the used water is returned to the permeable layer at the top of the casing. Configured. For this purpose, in the casing, a lower strainer portion is formed for pumping water, and an upper strainer portion is formed on the upper portion of the casing in order to return used water into the casing, and an upper strainer portion and a lower strainer portion are formed. In the casing between, the partition plate which interrupts | blocks between the upper and lower sides was attached and formed in the impermeable layer position.

  However, this partition plate welds the flange to the corresponding part of the lower pipe, while fixing the flange receiving plate at the corresponding position in the casing, and abuts the flange against the flange receiving plate when lowering the lower pipe into the casing It is supposed to let you. For this reason, although it can respond to a new well, the installation position of a partition plate is decided naturally by the depth of an impermeable layer, and a flange receiving plate cannot be fixed in the existing well.

  In addition, this groundwater heat exchanger is operated by pumping water from the aquifer around the lower strainer through the lower strainer while pumping the used water into the upper strainer and pouring it into the upper permeable layer. However, if there is a lot of dirt or foreign matter in the groundwater, the upper strainer for pouring water is likely to be clogged, and also in the lower strainer where water is pumped, clogging is likely due to suspended substances in the groundwater. If clogging occurs in the upper or lower strainer, heat exchange cannot be performed efficiently.

  In addition, this type of groundwater heat exchanger separates the inside of the well at the depth of the impermeable layer, pumps water from the aquifer around the lower strainer part, injects the used water into the upper strainer part, and circulates the groundwater Therefore, there is a problem that the heat exchange capacity of the apparatus is generally determined based on the upper water injection capacity with a small capacity.

  This invention solves the above-mentioned subject, and it aims at providing the groundwater heat exchange method and groundwater heat exchange apparatus which can perform efficient heat use and heat exchange using groundwater heat. .

The groundwater heat exchange method according to claim 1 of the present invention includes:
A casing having an upper screen portion and a lower screen portion is inserted into one well installed in the underground aquifer, and the movable separator moves up and down between the upper screen portion and the lower screen portion. An upper chamber is formed in an upper casing of the movable separation device, a lower chamber is formed in a lower casing of the movable separation device, and a lower pipe and an upper portion are formed in the casing. A tube is inserted, the tip of the lower tube is located in the lower chamber below the movable separator, the tip of the upper tube is located in the upper chamber above the movable separator, and the lower tube Or a groundwater heat exchange method in which groundwater in the casing is pumped through the upper pipe, and groundwater after heat utilization is returned to the ground through the upper pipe or lower pipe in the casing,
When pumping water from the lower chamber or upper chamber through the lower pipe or the upper pipe, and pouring groundwater after use of heat into the upper chamber or lower chamber through the upper pipe or the lower pipe and returning it to the ground, When the amount of water injected into the upper chamber or the lower chamber decreases or periodically, the pumping function of the lower pipe or the upper pipe and the injection function of the upper pipe or the lower pipe are switched to each other to perform pumping / water injection. It is characterized by.

  Here, “regularly” is a concept that includes, for example, switching between cooling and heating, or every month.

  According to the present invention, the clogging of the lower screen portion or the upper screen portion that occurs when water is pumped from the lower chamber or the upper chamber on the lower side of the movable separation device is the groundwater in the lower chamber or the upper chamber. The clogging of the upper screen or the lower screen that occurred when water was poured from the upper chamber or the lower chamber on the upper side of the movable separation device was eliminated by the reverse flow, and the reverse flow of the groundwater in the upper or lower chamber Is eliminated. For this reason, the use of backwashing of the screen due to such backflow of groundwater is performed regularly or when the amount of water injection is reduced, etc., to maximize the use of groundwater heat and to efficiently use groundwater heat. Can do.

  Further, the invention of claim 2 is the groundwater heat exchange method according to claim 1, wherein the movable separation device pumps the amount of water pumped from the lower chamber or the upper chamber through the lower tube or the upper tube, and the upper tube or The amount of water injected into the upper chamber or the lower chamber through the lower pipe is adjusted by moving the vertical position so that the amount of water injected is the same when switching between the flow paths.

  According to this invention, the utilization of groundwater heat can be optimized by making the amount of water pumped from the bottom of one well the same as the amount of water poured into the top.

  Further, the invention of claim 3 is the groundwater heat exchange method according to claim 1, wherein when the amount of water that can be poured into the upper chamber or the lower chamber is smaller than the amount of water pumped from the lower chamber or the upper chamber, It is characterized in that the groundwater of the difference between the amount and the injection amount flows into the infiltration facility provided on the ground after heat utilization and is infiltrated into the ground.

  According to this invention, while pumping up with the maximum pumping capacity in the well, the whole quantity of groundwater pumped can be reduced to the ground, and the heat utilization efficiency of groundwater heat can be made as high as possible.

On the other hand, the groundwater heat exchanger according to claim 4 of the present invention is
A casing having an upper screen portion and a lower screen portion is inserted into one well installed in the underground aquifer, and the movable separator moves up and down between the upper screen portion and the lower screen portion. An upper chamber is formed in an upper casing of the movable separation device, a lower chamber is formed in a lower casing of the movable separation device, and a lower pipe and an upper portion are formed in the casing. A tube is inserted, the tip of the lower tube is located in the lower chamber below the movable separator, the tip of the upper tube is located in the upper chamber above the movable separator, and the lower tube Or a groundwater heat exchanger that pumps groundwater in the casing through the upper pipe and returns the groundwater after heat utilization to the ground through the upper pipe or lower pipe in the casing,
A flow path switching device is connected to the ground portion of the lower pipe and the upper pipe so as to switch between the pump side or the heat exchanger side and the well side of the lower pipe and the upper pipe, and the upper pipe or the lower pipe. When the amount of water injected into the upper chamber or the lower chamber through the pipe decreases or periodically, the ground part of the lower pipe or the upper pipe is switched to the ground part of the upper pipe or the lower pipe and connected. The pumping function of the lower pipe or the upper pipe and the injection function of the upper pipe or the lower pipe are switched to each other to perform pumping and water injection.

  According to the present invention, the clogging of the lower screen portion or the upper screen portion that occurs when water is pumped from the lower lower chamber or the upper upper chamber of the movable separation device during normal operation is eliminated by the reverse flow of groundwater. The clogging of the upper screen portion or the lower screen portion that occurs when water is poured into the upper upper chamber or the lower lower chamber of the movable separation device is eliminated by the backflow of groundwater. For this reason, by regularly or automatically performing backwashing of the screen portion by such a reverse flow of groundwater, it is possible to maximize the utilization of groundwater heat and efficiently use the groundwater heat.

  According to a fifth aspect of the present invention, in the groundwater heat exchanger according to the fourth aspect, a pump suction side is connected to the ground portion of the lower pipe or the upper pipe, and a discharge side of the pump is connected to the upper pipe or the lower pipe through a heat pump. The flow path switching device is connected to the ground portion of the upper pipe and the lower pipe so as to be able to switch between pumping and water injection flow paths, and the flow path switching device and the heat pump are connected to the ground portion of the upper pipe and the lower pipe. When the regulating valve is connected and the water injection capacity of the other upper chamber or lower chamber is less than the pumping capacity of the other lower chamber or upper chamber, the regulating valve is opened and groundwater after heat utilization is It is characterized by flowing into the infiltration facility provided in the ground and allowing it to penetrate into the ground.

  According to this invention, while pumping up with the maximum pumping capacity which a well has, the whole quantity of groundwater pumped can be returned to the ground, and the heat utilization efficiency of groundwater heat can be made as high as possible.

  A sixth aspect of the present invention is the groundwater heat exchanger according to the fifth aspect, wherein a heat exchanger for removing the scale is connected between the flow path switching device and the heat pump.

  According to this invention, when the quality of the groundwater is poor, the suspended matter in the groundwater is adhered as a scale in the heat exchanger by passing through the heat exchanger, and the inside of the heat exchanger is periodically Washing can prevent the scale from adhering to the inner surface of a pipe such as a heat pump.

  According to the groundwater heat exchange method and the groundwater heat exchange apparatus of the present invention, the clogging of the lower screen portion of the lower chamber or the clogging of the upper screen portion of the upper chamber is eliminated by the reverse flow of the groundwater, and the screen is caused by the reverse flow of the groundwater. By performing backwashing of the section regularly or when the amount of water injection is reduced, the utilization of groundwater heat can be maximized, and efficient heat utilization and heat exchange can be performed using the groundwater heat.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional explanatory view of a groundwater heat exchanger. One well for groundwater heat utilization will be installed in the ground. The well is installed by placing and inserting a pipe-like casing 1 in a well that has been drilled to a depth that reaches a plurality of underground aquifers. The pipe-shaped casing 1 has a lower screen portion 3 formed at the lower portion thereof with a large number of thin slits or round holes, and the upper screen portion 2 is also formed above the lower screen portion 3 with the same structure. ing.

  The upper screen portion 2 and the lower screen portion 3 are provided in a form separated from the upper and lower sides by arranging a normal pipe portion therebetween, but can also be provided continuously in the upper and lower directions. An upper chamber 16 which will be described later is formed in the upper screen portion 2 in the casing 1, and a lower chamber 15 which will be described later is formed in the lower screen portion 3, but between the upper chamber 16 and the lower chamber 15. The movable separation device 4 that separates the upper chamber 16 and the lower chamber 15 into a partition shape is disposed so as to be vertically movable (up and down).

  The movable separation device 4 is configured such that, for example, an expandable packer 4a is disposed inside the casing 1 so as to be in close contact. The packer 4a is formed into a balloon shape by, for example, rubber or a rubber-like elastic body, and by pumping a fluid such as air into the inside by the pumping tube 5, expanding its outer diameter, and extracting the fluid inside, Shrink. Further, the packer 4a of the movable separator 4 is connected to the lower pipe 6, and the vertical position of the packer 4a can be adjusted by moving the connection position up and down.

  As shown in FIG. 1, the packer 4 a is in close contact between the lower chamber 15 and the upper chamber 16 in the casing 1 and separates the lower chamber 15 and the upper chamber 16 in the casing 1. That is, the upper chamber 16 is formed on the upper side of the movable separation device 4, and the lower chamber 15 is formed on the lower side of the movable separation device 4. On the other hand, the packer 4a in the contracted state adjusts the connection position with the lower pipe 6 upward or downward, and changes the separation position of the upper chamber 16 and the lower chamber 15 up and down.

  In addition, the movable separation device 4 can be configured by inserting a cylindrical body made of plastic or the like into the casing 1 so as to be slidable up and down, in addition to using the packer 4a as described above.

  The packer 4a of the movable separation device 4 separates the lower chamber 15 and the upper chamber 16 in the casing 1, but both the lower chamber 15 and the upper chamber 16 are disposed in the aquifer 21 in the ground. The

  Further, a lower pipe 6 and an upper pipe 7 for pumping and pouring water are inserted into the casing 1, the lower pipe 15 penetrates the movable separation device 4, and the opening tip of the lower pipe 6 is located at the lower part in the casing 1. Located in the lower chamber 15, the opening tip of the upper tube 7 is inserted so as to be positioned in the upper chamber 16 in the upper part of the casing 1. The lower pipe 6 and the upper pipe 7 are used as a pumping pipe or a water injection pipe so as to switch and operate. When the lower pipe 6 pumps water, the upper pipe 7 becomes a water injection pipe for water injection, and the upper pipe 7 When pumping up water, the lower pipe 6 serves as a water injection pipe.

  As shown in FIG. 1, the ground portions of the lower pipe 6 and the upper pipe 7 are connected to a flow path switching device 9, and a pump 8 and a heat pump 11 are connected to the other side of the flow path switching device 9 by a pipe line. That is, the ground portion of the lower pipe 6 is connected to the suction side of the pump 8 via the flow path switching device 9 and pumps the ground water in the lower chamber 15 through the lower pipe 6 when the pump 8 is operated. Groundwater in the upper chamber 16 is pumped through the upper pipe 7.

  The flow path switching device 9 switches the suction side pipe line connected to the pump 8 between the lower pipe 6 and the upper pipe 7 and also connects the pipe line connected for water injection (the heat pump 11 on the discharge side of the pump 8). And the pipe line connected via the regulating valve 10) are switched between the upper pipe 7 and the lower pipe 6.

  The pump 8 is a pump for pumping up groundwater and pouring groundwater after heat utilization into the ground, and the discharge side of the pump 8 is connected to the heat pump 11 through a pipe line. The discharge side of the heat pump 11 is connected to the inlet port of the flow path switching device 9 via the adjustment valve 10. The outlet side of the flow path switching device 9 is connected to the suction side of the pump by a pipe line, and the lower pipe 6 and the upper pipe 7 are connected to the two switching ports of the flow path switching device 9 in a switchable manner. .

  When the amount of water injected into the upper chamber 16 or the lower chamber 15 is smaller than the amount of water pumped from the lower chamber 15 or the upper chamber 16, the regulating valve 10 uses a difference between the pumped water amount and the water injected amount as a part of groundwater after heat utilization. As a valve that adjusts to flow through the infiltration facility 24.

  A permeation facility 24 for allowing water to permeate into the basement is formed in the casing 1 in the vicinity of the ground. When a part of the groundwater is drained by the regulating valve 10, the groundwater is permeated. It flows into the facility 24 and penetrates underground. The heat pump 11 to which the discharge side of the pump 8 is connected is a heat pump that is used for cooling or heating that uses groundwater heat, and exchanges the heat of the taken groundwater with the refrigerant of the heat pump.

  The infiltration facility 24 is an unnecessary facility including the regulating valve 10 when it has the required pumping capacity and water injection capacity and satisfies the heat exchange capacity of the heat pump, and is not necessarily required.

  Next, the groundwater heat exchange method performed using the groundwater heat exchange apparatus of the said structure is demonstrated. As shown in FIG. 1 and FIG. 2, this groundwater heat exchange device using one well is composed of a groundwater aquifer 21 for groundwater pumping and water injection, with a movable separator 4 sandwiched vertically. This is performed while switching between the side chamber 16 and the lower chamber 15.

  For this purpose, the casing 1 of the groundwater heat exchange device is connected to the aquifer 21 in the ground with the upper screen portion 2 (upper chamber 16) of the casing 1 and the lower side of the upper chamber 16 via the movable separation device 4. The lower screen part 3 (lower chamber 15) is disposed in the upper part.

  In this groundwater heat exchange device, the lower pipe 6 is switched as a pumping pipe or a water injection pipe, the upper pipe 7 is switched as a water injection pipe or a water pumping pipe, and the lower chamber 15 is switched as a pumping section or a water injection section. 16 is used as a water injection unit or a pumping unit, so that even when the water injection unit and the water pumping unit are switched, the depth of the movable separation device 4 is determined so that the pumping amount and the water injection amount do not change, It is necessary to install the lower chamber 15 and the upper chamber 16 in order to stably use the groundwater heat for a long period of time.

  For this reason, the position of the movable separation device 4 in the casing 1 is determined by the formation condition, the aquifer thickness, the strainer position, and a preliminary pumping test or water injection test. And it pumps up from one pumping part of the upper and lower sides of the movable separation apparatus 4, circulates groundwater so that it may return to the other water pouring part after using groundwater heat, and it becomes the amount of circulating water which can use optimal groundwater heat in that case As described above, the vertical position of the movable separation device 4 is determined.

  The operation of the groundwater heat exchanger is performed at the position of the movable separation device 4 determined in this way. During such operation, the lower pipe is operated by the operation of the pump 8 as shown in FIGS. The ground water is pumped from the lower chamber 15 in the lower part of the casing 1 or the upper upper chamber 16 in the casing 1 through the upper pipe 7 or the upper pipe 7, and is sent from the ground pump 8 to the heat pump 11 for heat exchange, that is, heat utilization.

  In the heat pump 11, for example, in summer, the refrigerant is cooled by groundwater having a temperature lower than the outside temperature to cool the room and the like, and in winter, the refrigerant is heated by groundwater having a temperature higher than the outside temperature and heated. Then, the groundwater after heat utilization is sent to the upper pipe 7 or the lower pipe 6 through the regulating valve 10 and the flow path switching device 9, and poured into the upper chamber 16 or the lower lower chamber 15 in the upper part of the casing 1, Driven to return groundwater to the ground.

  In the operation of the groundwater circulation as described above, basically, for example, when switching between cooling and heating, the pumping and the water injection are performed between the lower pipe 6 or the upper pipe 7 (the lower chamber 15 and the upper chamber 16). It is carried out by switching to. For this reason, suspended substances or the like in the ground water are unlikely to accumulate in the lower screen part 3 or the upper screen part 2 at the lower part of the casing 1, and clogging in the screen part is less likely to occur.

  By the way, in the same well, the pumped volume (pumping capacity) and the injected quantity (pumping capacity) are rarely the same, and usually the pumped volume (pumped capacity) is larger than the injected quantity (pumped capacity). Is less than the amount of pumped water, and the amount of circulating water used for groundwater heat will be within this small amount of water injection.

  In such a case, the regulating valve 10 is adjusted so that a part of the groundwater is drained to the infiltration facility 24, and an amount of groundwater obtained by subtracting the water injection amount from the pumped amount is allowed to flow to the infiltration facility 24. Thereby, the groundwater of the difference between the pumped water amount and the injected water amount permeates into the ground from the infiltration facility 24, and the groundwater heat exchanger is operated so that the pumped water amount and the injected water amount are matched. Thereby, the amount of water injection (water injection capacity) is substantially increased, and heat can be used up to the maximum water output (maximum water output capacity).

  On the other hand, the switching period of the water circulation is relatively long, and suspended matter in the groundwater of the aquifer 21 is placed on the lower screen part 3 or the upper screen part 2 of the casing 1 before the regular pumping and pouring time. When clogging occurs and clogging occurs, the amount of pumped water (pumping capacity) and the amount of water poured (pumping capacity) decrease.

  In such a case, when the pumped water amount or the injected water amount falls below a preset value, the pumped water and the injected water are mutually exchanged between the lower pipe 6 or the upper pipe 7 (the lower chamber 15 and the upper chamber 16). Switch over and perform backwash operation.

  This backwashing operation is performed by switching the flow path switching device 9, and when the flow path switching device 9 is switched, the suction side of the pump 8 is connected to the upper pipe 7 or the lower pipe 6 as shown in FIG. The discharge side of the pump 8, that is, the outlet port side of the regulating valve 10, is switched so as to be connected to the lower pipe 6 or the upper pipe 7. For this reason, as shown in FIG. 1 or FIG. 2, the pump 8 is operated to pump water from the upper chamber 16 in the upper part of the casing 1 through the upper pipe 7 or from the lower chamber 15 through the lower pipe 6. Water is injected from the lower chamber 15 through the lower pipe 6 or from the upper chamber 16 through the upper pipe 7. Thereby, in the upper screen part 2 and the lower screen part 3 of the casing 1, groundwater flows in the opposite direction, and suspended water in the groundwater of the aquifer 21 accumulated in the lower screen part 3 due to the water flow. The clogging is removed by removing the clogging, and the suspended substances accumulated in the upper screen portion 2 at the upper part of the casing 1 are removed to eliminate the clogging.

  Thus, according to the groundwater heat exchange method using the groundwater heat exchange apparatus having the above-described configuration, clogging of the lower screen portion 3 of the lower chamber 15 and clogging of the upper screen portion 2 of the upper chamber 16 are caused by reverse flow of groundwater. In order to maximize the utilization of groundwater heat by performing backwashing of the screen portion by backflow of groundwater regularly or when the amount of water injected into the upper chamber 16 or the lower chamber 15 is reduced, etc. Can be used for efficient heat utilization and heat exchange.

  In addition, by adjusting the regulating valve 10, a part of the pumped ground water is drained to the infiltration facility 24, and the amount of water injected (the amount of water injected) is caused to flow through the infiltration facility 24 by subtracting the amount of water injected from the pumped amount. Capacity) can be substantially increased and heat can be utilized up to the maximum yield (maximum pumping capacity).

  In addition, when the quality of groundwater is bad, a scale accumulates in the heat exchange flow path etc. in the heat pump 11, and the efficiency of heat exchange falls. In such a case, as shown in FIG. 3, a heat exchanger 12 for removing the scale is installed in the front stage of the heat pump 11, and the scale is attached to the surface of the heat exchange fins of the heat exchanger to The scale component of can be removed.

  Moreover, in the said embodiment, although groundwater heat was utilized for the heat pump 11, in addition to a heat pump, groundwater heat can be directly utilized for snow melting, or it can be utilized also for free cooling which directly uses groundwater heat for cooling.

It is a section explanatory view of a groundwater heat exchange device showing one embodiment of the present invention. It is a section explanatory view of a groundwater heat exchange device at the time of backwash operation. It is sectional explanatory drawing of the groundwater heat exchange apparatus which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Upper screen part 3 Lower screen part 4 Movable separation apparatus 5 Pumping tube 6 Lower pipe 7 Upper pipe 8 Pump 9 Flow path switching device 10 Control valve 11 Heat pump 12 Heat exchanger 15 Lower chamber 16 Upper chamber 21 Aquifer Tier 24 penetration facility

Claims (6)

A casing having an upper screen portion and a lower screen portion is inserted into one well installed in the ground, and a movable separation device is disposed between the upper screen portion and the lower screen portion so as to be movable up and down. An upper chamber is formed in the upper casing of the movable separation device, a lower chamber is formed in the lower casing of the movable separation device, and a lower pipe and an upper pipe are inserted into the casing. The tip of the lower tube is located in the lower chamber below the movable separator, and the tip of the upper tube is located in the upper chamber above the movable separator, the lower tube or the upper tube A method of exchanging groundwater in the casing through the groundwater, and returning the groundwater after heat utilization to the ground through the upper pipe or the lower pipe in the casing,
When pumping water from the lower chamber or upper chamber through the lower pipe or the upper pipe, and pouring groundwater after use of heat into the upper chamber or lower chamber through the upper pipe or the lower pipe and returning it to the ground, When the amount of water injected into the upper chamber or the lower chamber decreases or periodically, the pumping function of the lower pipe or the upper pipe and the injection function of the upper pipe or the lower pipe are switched to each other to perform pumping / water injection A groundwater heat exchange method characterized by   The movable separation device is configured such that the amount of water pumped from the lower chamber or the upper chamber through the lower tube or the upper tube and the amount of water injected into the upper chamber or the lower chamber through the upper tube or the lower tube are the lower pipe. The groundwater heat exchange method according to claim 1, wherein the pumping function of the upper pipe and the injection function of the upper pipe or the lower pipe are adjusted by moving their vertical positions so that they do not fluctuate during switching. .   When the amount of water that can be injected into the upper chamber or the lower chamber is smaller than the amount of water pumped from the lower chamber or the upper chamber, groundwater of the difference between the pumped amount and the injected amount is provided on the ground after heat utilization. The groundwater heat exchange method according to claim 1, wherein the groundwater heat exchange method is performed by flowing into an infiltration facility and infiltrating the ground. A casing having an upper screen portion and a lower screen portion is inserted into one well installed in the underground aquifer, and the movable separator moves up and down between the upper screen portion and the lower screen portion. An upper chamber is formed in an upper casing of the movable separation device, a lower chamber is formed in a lower casing of the movable separation device, and a lower pipe and an upper portion are formed in the casing. A tube is inserted, the tip of the lower tube is located in the lower chamber below the movable separator, the tip of the upper tube is located in the upper chamber above the movable separator, and the lower tube Or a groundwater heat exchanger that pumps groundwater in the casing through the upper pipe and returns the groundwater after heat utilization to the ground through the upper pipe or lower pipe in the casing,
A flow path switching device is connected to the ground portion of the lower pipe and the upper pipe so as to switch between the pump side or the heat exchanger side and the well side of the lower pipe and the upper pipe, and the upper pipe or the lower pipe. When the amount of water injected into the upper chamber or the lower chamber through the pipe decreases, the ground part of the lower pipe or the upper pipe is switched to the ground part of the upper pipe or the lower pipe, and the lower pipe is connected. Alternatively, a groundwater heat exchange device that performs pumping and water injection by switching between the pumping function of the upper pipe and the injection function of the upper pipe or the lower pipe.   The suction side of the pump is connected to the ground part of the lower pipe or the upper pipe, the discharge side of the pump is connected to the upper pipe or the lower pipe through a heat pump, and the flow path switching device is connected to the ground part of the upper pipe and the lower pipe. The pumping and pouring flow paths are connected to be switchable, and an adjustment valve is connected between the flow path switching device and the heat pump on the ground part of the upper pipe and the lower pipe. When the water injection capacity of the other upper chamber or lower chamber is less than the pumping capacity of the other, the adjustment valve is opened, and the groundwater after use of heat flows through the infiltration facility provided on the ground and penetrates into the ground. The groundwater heat exchanger according to claim 4. The groundwater heat exchanger according to claim 5, wherein a heat exchanger for removing scale is connected between the flow path switching device and the heat pump.

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