JP2017120169A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To function an underground heat pump regardless of a height of a natural water level.SOLUTION: A heat exchange system 1 includes a deep well 2 reaching an aquifer WBL, a lifting pump 4 for pumping up underground water from the deep well 2, a shallow well 5 as a well of a depth shallower than the deep well 2, and storing underground water pumped up from the deep well 2 by the lifting pump 4 so that a water level h2 of the stored underground water becomes higher in comparison with a natural water level h1 of the deep well 2, and a circulation pipe 6 drawn into the shallow well 5 from a heat pump 10 on the ground to be penetrated downward, and folded back upward to be drawn to the external of the shallow well 5 to circulate a liquid fed out from the heat pump 10, and heat is moved between the underground water in the shallow well 5 and the liquid flowing in the circulation pipe 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange system using groundwater.

  Due to rising crude oil prices and increased awareness of CO2 reduction, heat pumps that use geothermal heat (hereinafter referred to as geothermal heat pumps), which are low in running costs and are clean energy, have been developed and introduced into the market.

  The geothermal heat pumps disclosed in Patent Documents 1 and 2 flow a liquid such as water through a U tube built in a well, and exchange heat between the groundwater in the well and the liquid flowing in the U tube. By that, get the geothermal heat.

Japanese Patent No. 5067956 Japanese Patent No. 5690960

  However, in areas where a large amount of groundwater is pumped for snow extinguishing (for example, Nagaoka City, Niigata Prefecture), the natural water level decreases, so the above-described geothermal heat pump may not function.

  This invention is made | formed in view of the said subject, and it aims at providing the heat exchange system which can function a geothermal heat pump irrespective of the height of a natural water level.

  (1) The present invention is a deep well that reaches an aquifer, a pumping means that pumps groundwater from the deep well, and a hole that has a smaller depth than the deep well, and is removed from the deep well by the pumping means. The stored groundwater is stored, and the stored groundwater level is higher than the natural water level of the deep well, and is drawn into the storage hole from the ground heat pump and passed downward. And a circulation pipe that circulates upward and is drawn out of the storage hole and circulates the liquid sent out from the heat pump, and heat is generated between the groundwater in the storage hole and the liquid flowing through the circulation pipe. It is the heat exchange system characterized by moving.

  According to the present invention, groundwater pumped up from a deep well is stored in a storage hole having a depth smaller than that of the deep well, and heat is transferred between the groundwater in the storage hole and the liquid flowing through the circulation pipe. Even if the natural water level of the deep well is lowered, the geothermal heat pump can be made to function.

  (2) The present invention is also directed to water injection means for pouring groundwater pumped up from the deep well by the pumping means into a relatively deep position of the storage hole, and groundwater in the storage hole, relative to the storage hole. The heat exchanging system according to (1), further comprising: a drainage means for generating convection from below to above in the storage hole by discharging from a shallow position.

  According to the said invention, heat can be efficiently moved between the groundwater in a storage hole, and the liquid which flows through a circulation pipe by the convection which arose in the storage hole.

  (3) The present invention is also characterized in that the drainage means includes a drainage channel through which groundwater overflowing from the reservoir hole flows naturally, and a drainage pump for pumping up the groundwater in the reservoir hole. It is a heat exchange system as described in (2).

  According to the above invention, the amount of groundwater poured into the storage hole by the water injection means can be increased by actively pumping up the groundwater in the storage hole by the drainage pump. Thereby, the quantity of the heat moved between the groundwater in a storage hole and the liquid which flows through a circulation pipe can be increased.

  (4) The present invention also provides second water injection means for pouring groundwater pumped up from the deep well by the pumping means to a relatively shallow position of the storage hole, and groundwater in the storage hole. (2) or (3), characterized in that it comprises second drainage means for generating convection from above to below in the reservoir hole by pumping up from a relatively deep position. It is a heat exchange system.

  According to the said invention, while being able to pour water into the appropriate location of a storage hole, it can drain from the appropriate location of a storage hole.

  (5) The present invention also allows the water injection means and the drainage means to function when the heat pump uses warm heat, while the second water injection means and the second drainage means when the heat pump uses cold heat. The heat exchanging system according to (4) above, further comprising control means for functioning the above.

  According to the above invention, when the heat pump uses heat, the groundwater having heat is poured into a relatively deep position of the storage hole, and the groundwater is discharged from a relatively shallow position of the storage hole, Convection from below to above can be generated in the reservoir hole.

  On the other hand, when the heat pump uses cold heat, the groundwater having cold heat is poured into a relatively shallow position of the storage hole, and the groundwater is pumped up from a relatively deep position of the storage hole. The downward convection can be generated.

  Thus, heat can be efficiently moved between the groundwater in the storage hole and the liquid flowing through the circulation pipe by the convection generated in the storage hole.

  (6) The present invention is also the heat exchange system according to any one of (1) to (5), wherein the water storage hole is a well.

  According to the heat exchange system as described in said (1)-(6) of this invention, a geothermal heat pump can be functioned irrespective of the height of natural water level.

It is the schematic of the heat exchange system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of a control panel. It is the schematic of the heat exchange system which concerns on 2nd Embodiment of this invention. It is the schematic of the heat exchange system which concerns on 3rd Embodiment of this invention.

  Hereinafter, with reference to drawings, the heat exchange system concerning the embodiment of the present invention is explained in detail.

  [First Embodiment] First, the configuration of a heat exchange system 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram of a heat exchange system 1. FIG. 2 is a block diagram showing the configuration of the control panel 21. Note that in each drawing, a part of the configuration is omitted as appropriate to simplify the drawing.

  The heat exchange system 1 shown in FIG. 1 is a heat pump (ground heat pump) system that uses underground heat. The heat exchange system 1 is controlled centrally by a control panel 21. That is, the heat exchange system 1 operates under the control of the control panel 21, and the operation state is managed by the control panel 21. Specifically, the heat exchange system 1 is feedback-controlled based on the measurement results of thermometers arranged at various places so that the operation of each unit is in a desired state.

  Such a heat exchange system 1 includes a deep well 2, a pumping pipe (water injection means) 3, a pumping pump (pumping means) 4, a shallow well 5, a circulation pipe 6, a circulation pump 7, and groundwater temperature measurement. A pipe 8, a circulating fluid thermometer 9, a heat pump 10, a drainage channel (drainage means) 11, a control panel 21 and the like are provided.

  The deep well 2 is a hole that reaches the aquifer WBL of the underground GRD. For example, a cylindrical body (not shown) is embedded in the hole. The aquifer WBL is a geological layer including groundwater. The upper surface of the aquifer WBL is generally located at a depth D of about 100 m from the ground. For this reason, when the cylinder is embedded, the length of the cylinder is appropriately set to about 100 m so as to reach the aquifer WBL. The deep well 2 is thin and deep, and the inner diameter is preferably 120 mm or more and 250 mm or less.

  Inside the deep well 2, groundwater enters from the aquifer WBL. The natural water level h1 of the groundwater invading into the deep well 2 is generally within 10 m from the ground surface, but it is lowered by pumping up the groundwater. Here, for example, the ground surface To about 80 m. In such a deep well 2, a pumping pipe 3, a pumping pump 4 and the like are inserted.

  One end of the pumping pipe 3 is drawn into the deep well 2, and the other end is drawn into the shallow well 5. The pumping pipe 3 allows the groundwater taken from the deep well 2 by the power of the pumping pump 4 to flow to the shallow well 5.

  The pumping pump 4 is attached to one end of the pumping pipe 3 inside the deep well 2. The pump 4 takes groundwater from the deep well 2 into the pumping pipe 3 and applies power to the groundwater in the pumping pipe 3.

  The shallow well 5 is a water storage hole whose depth is smaller than that of the deep well 2. For example, a cylindrical body (not shown) is embedded in the hole. When the cylinder is embedded, the length of the cylinder is appropriately set to about 50 m. In such a shallow well 5, a pumping pipe 3, a circulation pipe 6, a groundwater temperature measuring pipe 8 and the like are inserted. The shallow well 5 is thin (though the depth is smaller than that of the deep well 2), and the inner diameter is preferably 120 mm or more and 250 mm or less.

  Inside the shallow well 5, groundwater pumped from the deep well 2 by the pumping pump 4 and poured through the pumping pipe 3 is stored. The groundwater level h2 stored inside the shallow well 5 is higher than the natural water level h1 of the deep well 2, for example, a depth within 10 m from the ground surface. The water level h2 substantially coincides with the height of the mouth (reference numeral omitted) of the drainage channel 11.

  The circulation pipe 6 is drawn into the inside of the shallow well 5 from the heat pump 10 on the ground and is passed downward, and is folded upward at the lower side of the shallow well 5 and drawn out of the shallow well 5. The circulation pipe 6 circulates liquid such as water sent out from the heat pump 10 by the power of the circulation pump 7. As a result, heat can be transferred between the groundwater in the shallow well 5 and the liquid flowing through the circulation pipe 6. That is, the heat exchange system 1 cools the liquid flowing through the circulation pipe 6 when the groundwater in the shallow well 5 is at a lower temperature than the liquid flowing through the circulation pipe 6. On the other hand, the heat exchange system 1 heats the liquid flowing through the circulation pipe 6 when the groundwater in the shallow well 5 is hotter than the liquid flowing through the circulation pipe 6.

  The circulation pump 7 is provided in the middle of the circulation pipe 6 and operates based on the measurement results of the thermometer 8a and the circulating fluid thermometer 9 constituting the groundwater temperature measurement pipe 8. Thus, the circulation pump 7 circulates the liquid in the circulation pipe 6 by applying power to the liquid in the circulation pipe 6.

  The groundwater temperature measuring tube 8 is inserted into the shallow well 5. The groundwater temperature measuring tube 8 includes a tube body 8a and a plurality of thermometers 8b. The plurality of thermometers 8b are attached to the pipe body 8a at a predetermined interval (for example, an interval of 10 m). The plurality of thermometers 8 b measure the temperature of groundwater in the shallow well 5, output the measurement result as a signal, and input the signal to the control panel 21.

  The circulating fluid thermometer 9 is provided in the middle of the circulation pipe 6. This circulating fluid thermometer 9 measures the temperature of the liquid in the circulation pipe 6 before the heat transfer between the groundwater in the shallow well 5 and outputs the measurement result as a signal. To enter.

  The heat pump 10 is connected to the circulation pipe 6 and the like. The heat pump 10 collects the cold or hot heat of the liquid flowing through the circulation pipe 6 and makes the collected cold or hot heat available for air conditioning or hot water supply. That is, the heat pump 10 takes out the cold or hot water of the groundwater that has moved to the liquid in the circulation pipe 6 in the shallow well 5 and makes it available for air conditioning and hot water supply.

  The drainage channel 11 is a drainage channel in which groundwater overflowing from the shallow well 5 naturally flows due to gravity or the like, and allows the groundwater overflowed from the shallow well 5 to flow into a river or a sewer.

  The pumping pipe 3 is a water injection means for pouring the groundwater pumped up from the deep well 2 by the pumping pump 4 into a relatively deep position of the shallow well 5, while the drainage channel 11 is for groundwater in the shallow well 5, By discharging from a relatively shallow position of the shallow well 5, the drainage means generates convection from below to above in the shallow well 5.

  As shown in FIG. 2, the control panel 21 includes a data logger 22 and a CPU (Central Processing Unit) 23.

  The data logger 22 is configured by a recording medium such as a RAM (Random Access Memory). The data logger 22 stores a processing program for the CPU 23 to execute various processes, various data (including data used by the determination unit 25 for determination) and various flags used when executing the various processes. Yes.

  The CPU 23 functions as the communication unit 24, the determination unit 25, and the control unit 26 by executing the processing program stored in the data logger 22.

  The communication unit 24 transmits and receives signals to and from each unit of the heat exchange system 1. Specifically, the communication unit 24 transfers the signals output from the thermometer 8b and the circulating fluid thermometer 9 constituting the groundwater temperature measuring tube 8 to the determination unit 25. And the communication part 24 transfers the control signal which the control part 26 outputs to the pumping pump 4, the circulation pump 7, and the heat pump 10. FIG.

  The determination unit 25 performs various determinations based on signals output from the thermometer 8b, the circulating fluid thermometer 9 and the like constituting the groundwater temperature measuring pipe 8, and thus the pumping pump 4, the circulation pump 7, the heat pump 10, and the like. Each driving situation is determined. Then, the determination unit 25 outputs the determination result as a signal to the control unit 26.

  The control unit 26 outputs a control signal based on the signal output from the determination unit 25 via the communication unit 24 to each of the pumping pump 4, the circulation pump 7, the heat pump 10, and the like. Control.

  Next, the heat flow in the heat exchange system 1 will be described with reference to FIG.

  First, the case where air conditioning is performed in the summer will be described. The heat pump 10 collects cold heat from the liquid flowing through the circulation pipe 6 and uses the collected cold heat for cooling. The liquid flowing through the circulation pipe 6 is heated by the heat pump 10. The liquid in the circulation pipe 6 heated by the heat pump 10 is cooled when the ground water in the shallow well 5 is heated, and can be used again by the heat pump 10. The groundwater in the shallow well 5 heated by the liquid flowing through the circulation pipe 6 is cooled by the movement of the groundwater from the deep well 2, drainage by the drainage channel 11, contact with the atmosphere, or the like.

  Next, a case where heating or hot water supply is performed in winter will be described. The heat pump 10 collects heat from the liquid flowing through the circulation pipe 6 and uses the collected heat for heating and hot water supply. The liquid flowing through the circulation pipe 6 is cooled by the heat pump 10. The liquid in the circulation pipe 6 cooled by the heat pump 10 is heated when the groundwater in the shallow well 5 is cooled, and can be used again by the heat pump 10. The groundwater in the shallow well 5 cooled by the liquid flowing through the circulation pipe 6 is heated by movement of the groundwater from the deep well 2, drainage by the drainage channel 11, contact with the atmosphere, or the like.

  As described above, according to the heat exchange system 1, the groundwater pumped up from the deep well 2 is stored in the shallow well 5 having a smaller depth than the deep well 2, and the groundwater in the shallow well 5 and the circulation pipe 6 are stored. Since heat is transferred between the flowing liquid and the natural water level h1 of the deep well 2 is lowered, the underground heat pump can be functioned. That is, according to the heat exchange system 1, the underground heat pump can be functioned regardless of the natural water level h1.

  In addition, the groundwater pumped up from the deep well 2 is poured into a relatively deep position of the shallow well 5, and the groundwater is discharged from the relatively shallow position of the shallow well 5, so that the shallow well is directed upward from below. Therefore, heat can be efficiently transferred between the groundwater in the shallow well 5 and the liquid flowing through the circulation pipe 6 by the convection.

  [Second Embodiment] Next, the configuration of a heat exchange system 31 according to a second embodiment will be described with reference to FIG. FIG. 3 is a schematic diagram of the heat exchange system 31.

  Here, only the characteristic part of the heat exchange system 31 according to the second embodiment will be described, and description of the same configuration, operation, and effect as the heat exchange system 1 according to the first embodiment will be omitted as appropriate. The same applies to the third embodiment to be described next.

  The heat exchange system 31 includes a drain pipe 32, a drain pump (drain means) 33, and the like in addition to the configuration of the heat exchange system 1 (see FIG. 1) according to the first embodiment.

  The drain pipe 32 has a distal end drawn into the shallow well 5 and a proximal end connected to the drain pump 33. The drain pipe 32 takes in groundwater from the shallow well 5 by the power of the drain pump 33.

  The drain pump 33 is a drain means for pumping up groundwater in the shallow well 5, and is connected to the base end of the drain pipe 32. The drain pump 33 applies power to the ground water in the shallow well 5 and takes the ground water from the shallow well 5 into the drain pipe 32. As a result, the water level h2 is slightly lower than the height of the mouth (reference numeral omitted) of the drainage channel 11.

  The pumping pipe 3 is a water injection means for pouring the groundwater pumped up from the deep well 2 by the pumping pump 4 into a relatively deep position of the shallow well 5, while the drainage pump 33 is a drainage pipe like the drainage channel 11. By using 32, the ground water in the shallow well 5 is discharged from a relatively shallow position of the shallow well 5, thereby generating convection in the shallow well 5 from below to above.

  The communication unit 24 (see FIG. 2) transfers the control signal output from the control unit 26 (see FIG. 2) to the drainage pump 33 and the like. The determination part 25 (refer FIG. 2) determines each driving | running state of drainage pump 33 grade | etc.,. The control unit 26 outputs a control signal to each of the drainage pumps 33 and the like based on the signal output from the determination unit 25 via the communication unit 24, and controls each operation state.

  As described above, according to the heat exchange system 31, the amount of groundwater poured into the shallow well 5 by the pumping pipe 3 can be increased by actively pumping the groundwater in the shallow well 5 by the drain pump 33. Thereby, the quantity of the heat moved between the ground water in the shallow well 5 and the liquid flowing through the circulation pipe 6 can be increased.

  [Third Embodiment] Next, the configuration of a heat exchange system 41 according to a third embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram of the heat exchange system 41.

  In addition to the configuration of the heat exchange system 31 (see FIG. 3) according to the second embodiment, the heat exchange system 41 is switched between a water injection pipe (second water injection means) 42, a switching valve 43, and a second drain pipe 44. A valve 45 and the like are provided.

  One end of the water injection pipe 42 is connected to the middle of the pumping pipe 3 via the switching valve 43, and the other end is drawn into the shallow well 5. The water injection pipe 42 flows groundwater taken from the deep well 2 to the shallow well 5 by the power of the pump 4.

  The switching valve 43 is provided at a branch point between the pumping pipe 3 and the water injection pipe 42, and the destination of the groundwater in the deep well 2 taken into the pumping pipe 3 is directly used as the pumping pipe (first water injection means) 3, It is switched depending on whether the water injection pipe (second water injection means) 42 is used.

  The second drain pipe 44 has a distal end drawn into the shallow well 5 and a proximal end connected to the middle of the drain pipe 32 via the switching valve 45. The second drain pipe 44 takes in groundwater from the shallow well 5 by the power of the drain pump 33. As a result, the water level h2 is slightly lower than the height of the mouth (reference numeral omitted) of the drainage channel 11.

  The water injection pipe 42 is a second water injection means for pouring the groundwater pumped up from the deep well 2 by the pumping pump 4 to a relatively shallow position of the shallow well 5, while the drainage pump 33 uses the second drainage pipe 44. And it is the 2nd discharge | emission means which produces the convection toward the downward direction in the shallow well 5 by drawing up the ground water in the shallow well 5 from the relatively deep position of the shallow well 5.

  The communication unit 24 (see FIG. 2) transfers a control signal output from the control unit (control means) 26 (see FIG. 2) to the switching valves 43, 45 and the like. The determination part 25 (refer FIG. 2) determines each driving | running condition of the switching valves 43 and 45 grade | etc.,.

  The control unit 26 outputs a control signal to each of the switching valves 43, 45 and the like based on the signal output from the determination unit 25 via the communication unit 24, and controls the respective driving situations. Specifically, when the heat pump 10 uses heat, the control unit 26 switches the switching valves 43 and 45 to function the pumping pipe 3 serving as the water injection means, and uses the drain pipe 32 to perform the drainage means. A certain drainage pump 33 is made to function. And the control part 26 switches the switching valves 43 and 45, when the heat pump 10 uses cold heat, makes the water injection pipe 42 which is a 2nd water injection means function, and uses the 2nd drain pipe 44, and is used. 2. The drainage pump 33 which is a drainage means is made to function.

  Next, the flow of heat in the heat exchange system 31 will be described with reference to FIG.

  First, the case where heating or hot water supply is performed in winter will be described. The groundwater having heat is poured from the deep well 2 to a relatively deep position in the shallow well 5 through the pumping pipe 3 which is the first water injection means. The groundwater in the shallow well 5 is drained from a relatively shallow position in the shallow well 5 through the drain pipe 32. The groundwater having hot heat poured into the shallow well 5 causes convection in the shallow well 5 from below to above.

  Next, the case of cooling in summer will be described. The groundwater having cold heat is poured from the deep well 2 to a relatively shallow position in the shallow well 5 through the water injection pipe 42 which is the second water injection means. Then, the groundwater in the shallow well 5 is drained from a relatively deep position in the shallow well 5 through the second drain pipe 44. The groundwater having cold heat poured into the shallow well 5 causes convection in the shallow well 5 from below to above.

  Thus, according to the heat exchange system 41, the groundwater pumped up from the deep well 2 is poured into the relatively deep position of the shallow well 5, and the groundwater pumped up from the deep well 2 is 5, a water injection pipe 42 that pours into a relatively shallow position is provided, so that water can be injected into an appropriate location of the shallow well 5.

  And the drainage pipe 32 which discharges the groundwater in the shallow well 5 from the relatively shallow position of the shallow well 5, and the second drainage which discharges the groundwater in the shallow well 5 from the relatively deep position of the shallow well 5. Since the pipe 44 is provided, the water can be drained from an appropriate portion of the shallow well 5.

  When the heat pump 10 uses heat (during heating or hot water supply), the groundwater having heat is poured into a relatively deep position of the shallow well 5 and groundwater is poured from a relatively shallow position of the shallow well 5. As a result, the convection from the lower side to the upper side can be generated in the shallow well 5.

  On the other hand, when the heat pump 10 uses cold (when cooling), the groundwater having cold is poured into a relatively shallow position of the shallow well 5 and the groundwater is pumped up from a relatively deep position of the shallow well 5. In the shallow well 5, convection from the upper side to the lower side can be generated.

  Thus, heat can be efficiently transferred between the groundwater in the shallow well 5 and the liquid flowing through the circulation pipe 6 by the convection generated in the shallow well 5.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and technical idea thereof. That is, the position, size, length, quantity, shape, material, timing, and the like of each component can be changed as appropriate.

  That is, in the said 3rd Embodiment, the pumping pipe 4 which is a water injection means, and the water injection pipe 42 which is a 2nd water injection means are implement | achieved by providing the one pumping pump 3 and the switching valve 43. However, the present invention is not limited to this. The present invention may be provided with two pumps and a water injection unit and a second water injection unit corresponding to each pump in a one-to-one manner.

  In the third embodiment, the drainage means and the second drainage means are realized by the single drainage pump 33 by including the single drainage pump 33 and the switching valve 45. The invention is not limited to this. The present invention may include two drain pumps and two drain pipes corresponding to each drain pump on a one-to-one basis.

  Moreover, although each said embodiment demonstrated as an example the case of the shallow well 5 as a water reservoir hole with a small depth compared with the deep well 2, this invention is not limited to this. The water storage hole in the present invention may be a water storage tank or the like, may be a shallow one having a depth of about 2 m to 3 m, or may be square in a top view.

1 heat exchange system 2 deep well 3 pumping pipe (water injection means)
4 pumping pump (pumping means)
5 shallow well (reservoir hole, well)
6 Circulation pipe 7 Circulation pump 8 Groundwater temperature measurement pipe 8a Pipe body 8b Thermometer 9 Circulating fluid thermometer 10 Heat pump 11 Drain flow path (drainage means)
21 Control panel 22 Data logger 23 CPU
24 communication unit 25 determination unit 26 control unit (control means)
31 Heat exchange system 32 Drain pipe 33 Drain pump (drainage means, second drainage means)
41 Heat exchange system 42 Water injection pipe (second water injection means)
43 selector valve 44 second drain pipe 45 selector valve GRD underground WBL aquifer D depth h1 natural water level h2 water level

(1) The present invention is a deep well that reaches an aquifer, a pumping means that pumps groundwater from the deep well, and a hole that has a smaller depth than the deep well, and is removed from the deep well by the pumping means. The stored groundwater is stored, and the stored groundwater level is higher than the natural water level of the deep well, and is drawn from the ground heat pump into the storage hole and passed downward. And a circulation pipe that circulates upward and is drawn out to the outside of the storage hole and circulates the liquid sent out from the heat pump, and groundwater pumped up from the deep well by the pumping means is relatively deep in the reservoir hole. The water injection means for pouring the position and the groundwater in the reservoir hole are discharged from a relatively shallow position of the reservoir hole, thereby generating convection from below to above in the reservoir hole. Drainage means, second water injection means for pouring groundwater pumped up from the deep well by the pumping means into a relatively shallow position of the reservoir hole, and groundwater in the reservoir hole, relative to the reservoir hole. By pumping up from a deep position, the second drainage means for generating convection from the top to the bottom in the reservoir hole, and the water injection means and the drainage means when the heat pump uses heat, Control means for causing the second water injection means and the second drainage means to function when the heat pump uses cold heat, and transfers heat between the groundwater in the storage hole and the liquid flowing in the circulation pipe It is a heat exchange system characterized by making it carry out.

According to the present invention, groundwater pumped up from a deep well is stored in a storage hole having a depth smaller than that of the deep well, and heat is transferred between the groundwater in the storage hole and the liquid flowing through the circulation pipe. Even if the natural water level of the deep well is lowered, the geothermal heat pump can be made to function.
And according to the said invention, heat can be efficiently moved between the groundwater in a storage hole, and the liquid which flows through a circulation pipe by the convection which arose in the storage hole.
Moreover, according to the said invention, while being able to pour water into the appropriate location of a storage hole, it can drain from the appropriate location of a storage hole.
Furthermore, according to the above invention, when the heat pump uses heat, the groundwater having heat is poured into a relatively deep position of the storage hole, and the groundwater is discharged from a relatively shallow position of the storage hole. Thus, convection from below to above can be generated in the storage hole.
On the other hand, when the heat pump uses cold heat, the groundwater having cold heat is poured into a relatively shallow position of the storage hole, and the groundwater is pumped up from a relatively deep position of the storage hole. The downward convection can be generated.
Thus, heat can be efficiently moved between the groundwater in the storage hole and the liquid flowing through the circulation pipe by the convection generated in the storage hole.

( 2 ) The present invention is also characterized in that the drainage means includes a drainage channel through which groundwater overflowing from the reservoir hole flows naturally, and a drainage pump for pumping up the groundwater in the reservoir hole. It is a heat exchange system as described in ( 1 ).

( 3 ) The present invention is also the heat exchange system according to (1) or ( 2 ) above, wherein the water storage hole is a well.

According to the heat exchange system as described in said (1)-( 3 ) of this invention, a geothermal heat pump can be functioned irrespective of the height of a natural water level.

Claims (6)

A deep well reaching the aquifer,
Pumping means for pumping up groundwater from the deep well;
A hole having a depth smaller than that of the deep well, storing the groundwater pumped up from the deep well by the pumping means, and storing the groundwater level higher than the natural water level of the deep well With holes,
A circulation pipe that circulates the liquid that is drawn from the ground heat pump to the inside of the water storage hole and passed downward, and folded upward and drawn out of the water storage hole, and sent out from the heat pump. ,
A heat exchange system, wherein heat is transferred between the groundwater in the water storage hole and the liquid flowing through the circulation pipe. Water injection means for pouring the groundwater pumped up from the deep well by the pumping means into a relatively deep position of the reservoir hole;
Drainage means for generating convection from below to above in the reservoir hole by discharging groundwater in the reservoir hole from a relatively shallow position of the reservoir hole. Item 2. The heat exchange system according to Item 1. As the drainage means,
A drainage channel through which the groundwater overflowed from the reservoir hole flows naturally,
The heat exchange system according to claim 2, further comprising a drainage pump that draws up groundwater in the water storage hole. Second water injection means for pouring groundwater pumped up from the deep well by the pumping means into a relatively shallow position of the reservoir hole;
And a second drainage means for generating convection from the upper side to the lower side in the reservoir hole by pumping up the groundwater in the reservoir hole from a relatively deep position of the reservoir hole. The heat exchange system according to claim 2 or 3. Control means for causing the water injection means and the drainage means to function when the heat pump uses warm heat, while causing the second water injection means and the second drainage means to function when the heat pump uses cold heat. The heat exchange system according to claim 4. The heat exchange system according to claim 1, wherein the water storage hole is a well.

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