JP2020173080A - Heat exchange unit and groundwater utilization system - Google Patents

Abstract

To provide a heat exchange unit and a groundwater utilization system enabling reduction in installation work cost.SOLUTION: A heat exchange unit 5 includes a heat exchanger 50 exchanging heat between groundwater 17 and liquid 18. The heat exchange unit 5 includes a CPU controlling a pump 151 or a pump 152 to supply the groundwater 17 to the heat exchanger 50. The heat exchange unit 5 includes a CPU controlling a pump 579 to supply the liquid 18 to the heat exchanger 50. The heat exchanger 50 is provided on the inner side of a case part 590. The CPU is provided on the outer surface or on the inner side of the case part 590. The heat exchange unit 5 is a unit in which the CPUs performing control to supply the groundwater 17 and the liquid 18 to the heat exchanger 50 and the heat exchanger 50 are provided on the inner side of the one case part 590.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat exchange unit and a groundwater utilization system that exchange heat with groundwater.

Conventionally, a groundwater utilization system that cools or heats by exchanging heat with groundwater is known. For example, the groundwater heat exchange device described in Patent Document 1 pumps groundwater from a pumping well, exchanges heat with a heat pump, and returns the groundwater used for heat exchange to a reduction well.

Japanese Unexamined Patent Publication No. 2011-21804

In the groundwater utilization system, before supplying the heat pump, a heat exchanger provided separately from the heat pump may exchange heat between the groundwater and the liquid, and supply the liquid to the heat pump. In this case, during the installation work of the groundwater utilization system, the first control unit that controls the pump that pumps the groundwater to supply the groundwater to the heat exchanger and the pump that flows the liquid are controlled to supply the liquid to the heat exchanger. It was necessary to separately install the second control unit and the heat exchanger, which supply the heat exchanger, on site. For this reason, the cost has increased due to the creation of construction drawings and the large number of construction processes when the installation work is carried out locally.

An object of the present invention is to provide a heat exchange unit and a groundwater utilization system capable of reducing the cost of installation work.

The heat exchange unit according to the first aspect of the present invention controls a case portion, a heat exchanger that exchanges heat between ground water and a liquid, and a first pump that pumps the ground water from a well, and uses the ground water as described above. A first control means for supplying the heat exchanger and a second control means for controlling the second pump for flowing the liquid and supplying the liquid to the heat exchanger are provided, and the heat exchanger is the case portion. The first control means and the second control means are provided on the outer surface of the case portion or inside the case portion. In this case, a first control means for supplying groundwater to the heat exchanger, a second control means for supplying liquid to the heat exchanger, a heat exchanger, and a case portion are provided in one heat exchange unit. There is. When performing on-site installation work, the first control means, the second control means, and the heat exchanger can be installed by installing only one heat exchange unit, so that the first control means, the second control means, And the heat exchanger is provided separately, and the man-hours for the installation work are reduced as compared with the case where the case portion is not provided. In addition, the man-hours for creating a design drawing for installation work are reduced. Therefore, the cost of installation work can be reduced.

In the heat exchange unit, the first control means and the second control means may be one component arranged in one control panel. In this case, the first control means and the second control means are separate parts, and the number of control panels is smaller than when they are arranged in separate control panels, and the cost of the heat exchange unit is reduced. Can be done.

The heat exchange unit measures a first temperature measuring means for measuring the first temperature, which is the temperature of the ground water flowing into the heat exchanger, and a second temperature, which is the temperature of the ground water flowing out of the heat exchanger. The first pump is a pump capable of adjusting the flow rate of the ground water, and the first control means is the first temperature measured by the first temperature measuring means. The flow rate of the ground water by the first pump may be adjusted based on the temperature difference from the second temperature measured by the second temperature measuring means, and the ground water may be supplied to the heat exchanger. In this case, the power consumption is reduced as compared with the case where the groundwater is flowed at a constant flow rate without adjusting the flow rate. Therefore, the operating cost of the heat exchange unit can be reduced.

The heat exchange unit measures a third temperature measuring means for measuring the third temperature, which is the temperature of the liquid flowing into the heat exchanger, and a fourth temperature, which is the temperature of the liquid flowing out of the heat exchanger. The second pump is a pump capable of adjusting the flow rate of the liquid, and the second control means is the third temperature measured by the third temperature measuring means. , The flow rate of the liquid by the second pump may be controlled based on the temperature difference from the fourth temperature measured by the fourth temperature measuring means. In this case, the power consumption is reduced as compared with the case where the liquid is flowed at a constant flow rate without adjusting the flow rate. Therefore, the operating cost of the heat exchange unit can be reduced.

In the heat exchange unit, the heat exchanger may be replaceable by a flange connection. In this case, the heat exchanger inside the heat exchange unit can be replaced. Therefore, it is not necessary to cut and weld the piping in the heat exchange unit when the heat exchange unit is clogged with foreign matter and needs to be replaced. In addition, there is no need to clean the heat exchanger, which is expensive, such as disassembly cleaning, chemical cleaning, and neutralization treatment. Therefore, the replacement cost when the heat exchanger deteriorates is reduced. This reduces the maintenance cost of the heat exchange unit.

The heat exchange unit is attached to the heat exchanger based on the pressure measuring means for measuring the pressure of the ground water flowing in or out of the heat exchanger and the pressure of the ground water measured by the pressure measuring means. The first clogging determining means for determining whether or not clogging has occurred, and the first notifying means for notifying when the first clogging determining means determines that the heat exchanger is clogged. And may be provided. In this case, when the heat exchanger is clogged with foreign matter, the first notification means notifies the heat exchanger, so that the user can easily determine that it is time to replace the heat exchanger. Therefore, the convenience of the user is improved.

The heat exchange unit calculates an average temperature difference with respect to the heat exchanger based on the temperature at which the ground water flows in, the temperature at which the ground water flows out, the temperature at which the liquid flows in, and the temperature at which the liquid flows out. Then, the heat exchanger is clogged by the second clogging determining means for determining whether or not the heat exchanger is clogged based on the average temperature difference and the second clogging determining means. May be provided with a second notifying means for notifying when it is determined that the above has occurred. In this case, the average temperature difference changes when the heat exchanger is clogged with foreign matter. Then, when it is determined that the heat exchanger is clogged based on the average temperature difference, the second notification means notifies the user, so that the user can easily determine that it is time to replace the heat exchanger. it can. Therefore, the convenience of the user is improved.

In the heat exchange unit, the groundwater flow path and the liquid flow path may be provided inside the case portion, and a heat insulating material may be provided in the case portion. In this case, the heat insulating material provided in the case portion protects the groundwater flow path, the liquid flow path, and the heat exchanger provided inside the case portion from the air temperature outside the heat exchange unit. Since the heat insulating material is provided in the case portion, it is not necessary to arrange the heat insulating material individually for the groundwater flow path, the liquid flow path, and the heat exchanger. Therefore, the cost can be reduced as compared with the case where the heat insulating material is individually arranged in the groundwater flow path, the liquid flow path, and the heat exchanger. Further, when the heat exchange unit is installed on site, it is not necessary to construct the heat insulating material on site. Therefore, the construction period can be shortened and the cost of installation work can be reduced.

The heat exchange unit may include an air bleeding valve with a check valve provided in the groundwater flow path. In this case, the air contained in the groundwater flow path of the heat exchange unit can be removed. Further, even when the first pump is stopped, the possibility of groundwater flowing out in the flow path can be reduced. Therefore, the pump power at the start of driving the first pump can be reduced, and the siphon effect eliminates the need for pumping water and only the piping resistance of the flow path.

The heat exchange unit includes an intake port connected to the groundwater flow path, and by attaching a faucet to the intake port, a generator supplies power to the heat exchange unit in the event of a disaster and uses the groundwater as disaster water. May be possible. In this case, in the event of a disaster, the heat exchange unit can be used to provide disaster water.

The groundwater utilization system according to the second aspect of the present invention is a groundwater utilization system including a heat exchange unit and a heat pump, and the heat exchange unit exchanges heat between the case portion and the groundwater and the liquid. The heat exchanger, the first control means for pumping the ground water from the well, the first control means for supplying the ground water to the heat exchanger, and the second pump for flowing the liquid are controlled, and the liquid is supplied to the heat exchanger. A second control means for supplying the heat exchanger is provided, the heat exchanger is provided inside the case portion, and the first control means and the second control means are on the outer surface of the case portion or The heat pump, which is provided inside the case portion, exchanges heat between the liquid and the fluid, which have undergone heat exchange by the heat exchanger. In this case, a first control means for supplying groundwater to the heat exchanger, a second control means for supplying liquid to the heat exchanger, a heat exchanger, and a case portion are provided in one heat exchange unit. There is. Therefore, when the groundwater utilization system is installed, the first control means and the second control means can be installed only by installing one heat exchange unit. Therefore, the man-hours for the installation work are reduced as compared with the case where the first control means and the second control means are separately provided and the case portion is not provided. Therefore, the cost of installing the groundwater utilization system can be reduced.

It is a figure which shows the structure of the groundwater utilization system 1. It is a figure which shows the electrical structure of the groundwater utilization system 1. It is a data structure diagram of the data table 95. It is a figure which shows the direction of the backwash in the groundwater utilization system 1. It is a flowchart of outdoor unit processing. It is a flowchart of a main process. It is a continuation flowchart of FIG. It is a figure which shows the modification of the backwash in the groundwater utilization system 1. It is a flowchart of the first modification of FIG. It is a flowchart of the 2nd modification of FIG. It is a flowchart of the 3rd modification of FIG.

Hereinafter, the groundwater utilization system 1 that embodies the present invention will be described. First, the outline of the groundwater utilization system 1 will be described with reference to FIG. The groundwater utilization system 1 shown in FIG. 1 is a system that uses the heat of the groundwater 17 to air-condition the interior 781 of the building 78. In the following description, the upper side and the lower side of the paper surface of FIG. 1 are referred to as the upper side and the lower side of the groundwater utilization system 1. Further, the lower side of the groundwater utilization system 1 is in the direction of gravity, and the upper side is in the direction of antigravity.

The environment at the site where the groundwater utilization system 1 is installed will be described. At the site where the groundwater utilization system 1 is arranged, there are a first well 81, a second well 82, and a building 78. The building 78 is built on the upper side of the ground surface 105. The first well 81 and the second well 82 are each provided downward from the ground surface 105. Groundwater 17 is accumulated in the first well 81 and the second well 82. The groundwater 17 in the first well 81 and the second well 82 is supplied from a permeable stratum (not shown).

The configuration of the groundwater utilization system 1 will be described. The groundwater utilization system 1 includes an indoor unit 10, an outdoor unit 20, a heat exchange unit 5, channels 11, 12, 13, 14, 901, 902, 903, 904 and the like.

One end of the flow path 901 and the flow path 902 is arranged in the groundwater 17 of the first well 81. A pump 151 is connected to the end of the first well 81 of the flow path 901. The end of the first well 81 of the flow path 902 is an outlet 141 which is an opening. The outflow port 141 and the pump 151 are arranged below the water surface 811 of the groundwater 17 of the first well 81. In the groundwater 17 of the second well 82, one end of the flow path 903 and the flow path 904 is provided. A pump 152 is connected to the end of the second well 82 of the flow path 903. The end of the second well 82 of the flow path 904 is an outlet 142 which is an opening. The outlet 142 and the pump 152 are arranged below the water surface 821 of the groundwater 17 of the second well 82.

In the first well 81, the water level sensor 971 is arranged above the water surface 811 of the groundwater 17. In the second well 82, the water level sensor 972 is arranged above the water surface 821 of the groundwater 17. The water level sensor 971, 972 is a switch type that turns on when the water surface 811,821 rises to the position of the water level sensor 971,972. The pumps 151, 152 and the water level sensors 971, 972 are electrically connected to the control panel 580 of the heat exchange unit 5 by electrical wiring (not shown).

The heat exchange unit 5 is one device covered with a case portion 590 which is an exterior. The case portion 590 is provided with connection ports 591,592,593,594,595,596 that can be connected to a flow path provided outside the heat exchange unit 5. A heat insulating material 598 is provided inside the case portion 590.

Inside the rectangular case portion 590, the heat exchange unit 5 includes flow paths 501 to 514, discharge flow paths 515, air vent valves 941, 942, drainage drain pan 599, temperature sensors 571 to 574, pressure sensors 576, 577, and so on. Equipped with safety valve 943, electric valve 561-568, on-off valve 569,570, waste liquid valve 944, flow meter 575, pump 579, expansion tank 578, control panel 580, connection port 591-596, operation unit 588, and alarm 589. ing. The flow paths 501 to 509 are flow paths through which the groundwater 17 flows. The flow paths 510 to 514 are flow paths through which the liquid 18 which is an antifreeze liquid flows. Various electronic components are mounted on the control panel 580 to control the heat exchange unit 5.

The heat exchanger 50 is a device that exchanges heat between the groundwater 17 and the liquid 18. The heat exchanger 50 is fixed to the inside of the heat exchange unit 5 by flanges 541, 542, 543, 544, which are connecting members. The heat exchanger 50 can be removed from the heat exchange unit 5 by opening the flanges 541 to 544. Therefore, the heat exchanger 50 can be removed from the heat exchange unit 5 and a new heat exchanger 50 can be installed in the heat exchange unit 5. That is, the heat exchanger 50 can be replaced by flange connection. When replacing the heat exchanger 50, the user, for example, removes a part of the case portion 590 and replaces the heat exchanger 50.

The connection ports 591 to 596 are fixed to the case portion 590. The flow path 901 is connected to the connection port 591. The flow path 902 is connected to the connection port 592. The flow path 903 is connected to the connection port 593. The flow path 904 is connected to the connection port 594.

The flow path 501 is connected to the heat exchanger 50 via the flange 541. The flow path 501 extends from the heat exchanger 50 and branches into the flow paths 502 and 503 at the connection portion 521. The flow path 502 is connected to the connection port 591. The flow path 503 is connected to the connection port 592. The flow path 502 and the flow path 901 are connected to each other via a connection port 591. The flow path 503 and the flow path 902 are connected to each other via a connection port 592.

The flow path 504 is connected to the heat exchanger 50 via the flange 542. The flow path 504 extends from the heat exchanger 50 and branches into the flow paths 505 and 506 at the connection portion 522. The flow path 505 is connected to the connection port 593. The flow path 506 is connected to the connection port 594. The flow path 505 and the flow path 903 are connected to each other via a connection port 593. The flow path 506 and the flow path 904 are connected to each other via a connection port 594.

The air bleeding valve 941 is connected to one end of the flow path 507. In the present embodiment, the air bleeding valve 941 is, for example, an air bleeding valve with a check valve. The air bleed valve 941 is mechanical and operates automatically. The other end of the flow path 507 is connected to the flow path 501 at the connection portion 523.

The flow path 508 is connected to the flow path 501 at the connection portion 524. The flow path 508 extends toward the drain pan 599. One end of the flow path 501 is an outlet 551 which is an opening arranged above the drainage drain pan 599.

The flow path 509 is connected to the flow path 504 at the connection portion 525. The flow path 509 extends toward the drain pan 599. One end of the flow path 504 is an outlet 552, which is an opening arranged above the drainage drain pan 599.

A drainage channel 515 is connected to the drainage drain pan 599. The discharge flow path 515 extends to the outside of the case portion 590. The drainage drain pan 599 receives the groundwater 17 discharged from the outlets 551 and 552 of the flow paths 508 and 509. The groundwater 17 discharged to the drainage drain pan 599 is discharged to the outside of the heat exchange unit 5 via the discharge flow path 515.

The motorized valve 561 is provided between the connection portion 523 of the flow path 501 and the heat exchanger 50. The motorized valve 562 is provided between the connection portion 525 of the flow path 504 and the heat exchanger 50. The motorized valve 563 is provided in the flow path 502. The motorized valve 564 is provided in the flow path 503. The motorized valve 565 is provided in the flow path 505. The motorized valve 566 is provided in the flow path 506. The motorized valve 567 is provided in the flow path 508. The motorized valve 568 is provided in the flow path 509.

The temperature sensor 571 and the pressure sensor 576 are provided between the motorized valve 561 and the heat exchanger 50 in the flow path 501. The temperature sensor 572 and the pressure sensor 577 are provided between the motorized valve 562 and the heat exchanger 50 in the flow path 504.

The flow path 510 is connected to the heat exchanger 50 via the flange 543. The flow path 510 is connected to the connection port 595. The flow path 511 is connected to the flow path 510 at the connection portion 526. The flow path 512 is connected to the flow path 511 at the connection portion 527. An air bleeding valve 942 is provided at one end of the flow path 511. A safety valve 943 is provided at one end of the flow path 512. The air bleeding valve 942 and the safety valve 943 are mechanical and operate automatically.

The on-off valve 569 is provided between the connection portion 526 and the heat exchanger 50 in the flow path 510. The on-off valve 569 is manually opened and closed. The temperature sensor 573 is provided between the on-off valve 569 and the connection portion 526 in the flow path 510.

The flow path 513 is connected to the heat exchanger 50 via the flange 544. The flow path 513 is connected to the connection port 596. The flow path 514 is connected to the flow path 513 at the connection portion 528. A waste liquid valve 944 for maintenance is provided at one end of the flow path 514. When maintenance of the heat exchange unit 5 is performed, the waste liquid valve 944 is manually opened and the liquid 18 is discharged. The discharged liquid 18 is received in a container (not shown). When the liquid 18 is sealed in the flow path 510 and the flow path 513, the liquid 18 is injected from the waste liquid valve 944 into the flow path 510 and the flow path 513.

The on-off valve 570, the temperature sensor 574, the flow meter 575, the pump 579, and the expansion tank 578 are provided in order in the flow path 513 in the direction from the heat exchanger 50 to the connection portion 528. The density of the liquid 18 changes depending on the air temperature. The expansion tank 578 is a tank provided to absorb a change in the density of the liquid 18. The flow meter 575 measures the flow rate of the liquid 18 flowing through the flow path 513. The on-off valve 570 is manually opened and closed.

The control panel 580 is provided inside the case portion 590. The operation unit 588 and the alarm 589 are provided on the outer surface of the case unit 590.

The outdoor unit 20 is provided outdoors (outside the building 78). The outdoor unit 20 is, for example, a multi-outdoor unit for a water-cooled building that supports geothermal heat. The outdoor unit 20 includes a heat pump 2 and a control panel 210. The flow path 11 and the flow path 12 are connected to the heat pump 2 and the indoor unit 10, respectively. The flow path 13 and the flow path 14 are connected to the heat pump 2. The flow path 11 and the flow path 12 are flow paths through which the fluid 16 flows. The fluid 16 is, for example, a refrigerant. The flow paths 11 and 12 are refrigerant pipes. The control panel 210 controls the heat pump 2. Further, the control panel 210 is connected to the control panel 580 of the heat exchange unit 5 by an electric wiring (not shown).

The flow path 13 extends from the heat pump 2 to the outside of the outdoor unit 20 and is connected to the connection port 595 of the heat exchange unit 5. The flow path 14 extends from the heat pump 2 to the outside of the outdoor unit 20 and is connected to the connection port 596 of the heat exchange unit 5. The flow path 510 and the flow path 13 are connected to each other via a connection port 595. The flow path 513 and the flow path 14 are connected to each other via a connection port 596.

The liquid 18 flows inside the flow paths 13, 14, 510, 513. The liquid 18 is flowed by the pump 579 in the order of the flow path 510, the flow path 13, the heat pump 2, the flow path 14, the flow path 513, and the heat exchanger 50, and circulates in the path. More specifically, the liquid 18 flows into the heat exchanger 50 through the flow path 513, exchanges heat with the groundwater 17, and flows out from the flow path 510. The liquid 18 flows into the heat pump 2 through the flow path 13, exchanges heat with the fluid 16, and flows out of the flow path 14.

The indoor unit 10 is arranged in the indoor 781 of the building 78. The fluid 16 flows in the order of the heat pump 2, the flow path 11, the indoor unit 10, the flow path 12, and the heat pump 2, and circulates in the path. The indoor unit 10 takes in air from the room 781, exchanges heat with the fluid 16, adjusts the temperature of the air, and blows the air into the room 781 with a blower. As a result, the room 781 is cooled or heated. Although only one indoor unit 10 is shown in the figure, a plurality of indoor units 10 may exist in a plurality of rooms.

The electrical configuration of the groundwater utilization system 1 will be described with reference to FIG. The control panel 580 of the heat exchange unit 5 includes a CPU 581, a ROM 582, a RAM 583, and the like. The control panel 210 of the outdoor unit 20 includes a CPU 211, a ROM 212, and a RAM 213. The CPU 581 and the CPU 211 are electrically connected to each other and cooperate with each other to control the groundwater utilization system 1. The CPU 581 controls the heat exchange unit 5 and the pumps 151 and 152.

The CPU 211 of the outdoor unit 20 is electrically connected to the heat pump 2 and the indoor unit 10. The CPU 211 controls the heat pump 2 and the indoor unit 10. The indoor unit 10 includes an operation unit 101. The CPU 211 and the CPU 581 control the cooling and heating by the indoor unit 10 based on the instruction from the user input from the operation unit 101.

The CPU 211 of the outdoor unit 20 is electrically connected to the ROM 212 and the RAM 213. The ROM 212 stores various program data such as a program for outdoor unit processing (see FIG. 5), which will be described later, and various other data. Various temporary data are stored in the RAM 213.

The CPU 581 of the heat exchange unit 5 is electrically connected to the ROM 582 and the RAM 583. The ROM 582 stores various program data such as a program for main processing (see FIGS. 6 and 7) described later. Various temporary data are stored in the RAM 583.

The CPU 581 includes a heat exchanger 50, a pump 151, 152, a pump 579, a water level sensor 971, 972, a flow meter 575, a temperature sensor 571-574, a pressure sensor 576, 577, an operation unit 588, an alarm 589, and an electric valve 561. It is electrically connected to ~ 568. The CPU 581 controls the motorized valves 561 to 568 to open and close the flow path.

The CPU 581 detects the temperature of the groundwater 17 flowing through the flow paths 501 and 504 based on the outputs of the temperature sensors 571 and 572. The CPU 581 detects the temperature of the liquid 18 flowing through the flow paths 510 and 513 based on the outputs of the temperature sensors 573 and 574.

The CPU 581 detects the pressure of the groundwater 17 flowing through the flow paths 501 and 504 based on the output of the pressure sensors 576 and 577. The CPU 581 detects the flow rate of the liquid 18 flowing through the flow path 513 based on the output of the flow meter 575.

The CPU 581 controls pumps 151 and 152 to supply groundwater 17 from the first well 81 and the second well 82 to the heat exchanger 50. In the present embodiment, as an example, the pumps 151 and 152 are pumps (for example, an inverter pump) whose flow rate of the groundwater 17 can be adjusted. The CPU 581 controls the flow rate of the groundwater 17 of the pumps 151 and 152 to adjust the flow rate of the groundwater 17 supplied from the first well 81 to the heat exchanger 50. The CPU 581 adjusts the flow rate of the groundwater 17 by the pumps 151 and 152 with reference to the outputs of the temperature sensors 571 and 572.

The CPU 581 controls the pump 579 to flow the liquid 18. The liquid 18 flows in the order of the flow path 510, the flow path 13, the heat pump 2, the flow path 14, the flow path 513, and the heat exchanger 50. In the present embodiment, as an example, the pump 579 is a pump (for example, an inverter pump) capable of adjusting the flow rate of the groundwater 17. The CPU 581 adjusts the flow rate of the liquid 18 by the pump 579 with reference to the outputs of the temperature sensors 573 and 574. Further, the CPU 581 adjusts the flow rate of the liquid 18 with reference to the output of the flow meter 575.

The CPU 581 acquires a user's instruction input via the operation unit 588. The alarm 589 can turn on the light. The CPU 581 controls the lighting of the alarm 589 to notify the user.

The data table 95 will be described with reference to FIG. The data table 95 is stored in various storage media such as ROM 582 or RAM 583. In the data table 95, the reference water level of the first well 81, the reference water level of the second well 82, the predetermined rise amount of the first well 81, the predetermined rise amount of the second well 82, the first predetermined time, the second predetermined time, And the predetermined time is stored. The reference water level of the first well 81 is, for example, the average value of the water level of the first well 81 in a state where the groundwater 17 is not pumped or reduced. The reference water level of the second well 82 is, for example, the average value of the water level of the second well 82 in a state where the groundwater 17 is not pumped or reduced.

The predetermined amount of rise of the first well 81 is a predetermined value of the amount of rise of the groundwater 17 from the reference water level of the first well 81. In the present embodiment, as an example, the value is set to be lower than the maximum amount of increase of groundwater 17 allowed in the first well 81 (for example, 70% of the maximum amount of increase).

The predetermined amount of rise of the second well 82 is a predetermined value of the amount of rise of the groundwater 17 from the reference water level of the second well 82. In the present embodiment, as an example, the value is set to be lower than the maximum amount of increase of groundwater 17 allowed in the second well 82 (for example, 70% of the maximum amount of increase).

The first predetermined time is a reference time for performing intermittent backwashing, which will be described later, when the operation time is equal to or longer than the first predetermined time. The second predetermined time is a reference time for performing intermittent backwashing when the operating time is equal to or longer than the second predetermined time. The second predetermined time is a time longer than the first predetermined time. For example, the first predetermined time is 48 hours and the second predetermined time is 72 hours. The predetermined time is the time when intermittent backwashing is performed.

In the present embodiment, the reference water level of the first well 81 is "K1", the reference water level of the second well 82 is "K2", the predetermined rise amount of the first well 81 is "K11", and the predetermined rise of the second well 82. It is assumed that the amount is "K21", the first predetermined time is "T1", the second predetermined time is "T2", and the predetermined time is "T3". Further, the water level sensor 971 is arranged at a position where the groundwater 17 of the first well 81 is turned on when the predetermined amount of rise "K11" is reached. The water level sensor 972 is arranged at a position where the groundwater 17 in the second well 82 is turned on when the predetermined amount of rise “K21” is reached.

The flow of the groundwater 17, the liquid 18, and the fluid 16 when the room 781 is cooled or heated with reference to FIG. 1 will be described. The heat exchanger 50 is configured to cool or heat the liquid 18 flowing in from the flow path 513 by utilizing the temperature of the groundwater 17 flowing in from the flow path 501 or the flow path 504. The heat pump 2 is configured to cool or heat the fluid 16 flowing in from the flow path 14 by utilizing the temperature of the liquid 18 flowing in from the flow path 13 by the heat pump method.

The CPU 581 opens the motor-operated valves 561,562,563,566, closes the motor-operated valves 564,565,567,568, and drives the pump 151. In this case, the groundwater 17 is pumped from the first well 81 and flows into the heat exchanger 50 via the flow path 901, the flow path 502, and the flow path 501. The heat exchanger 50 uses the heat of the inflowing groundwater 17 to cool or heat the liquid 18. The groundwater 17 used for heat exchange flows out to the second well 82 via the flow path 504, the flow path 506, the flow path 903, and the outflow port 142. In the following description, the direction in which the groundwater 17 that is pumped from the first well 81 and flows out to the second well 82 via the heat exchanger 50 is referred to as the first direction H1.

The CPU 581 opens the motor-operated valves 561,562,564,565, closes the motor-operated valves 563,566,567,568, and drives the pump 152. In this case, the groundwater 17 is pumped from the second well 82 and flows into the heat exchanger 50 via the flow path 903, the flow path 505, and the flow path 504. The heat exchanger 50 uses the heat of the inflowing groundwater 17 to cool or heat the liquid 18. The groundwater 17 used for heat exchange flows out to the first well 81 via the flow path 501, the flow path 503, the flow path 902, and the outflow port 141. In the following description, the direction in which the groundwater 17 pumped from the second well 82 and flows out to the first well 81 via the heat exchanger 50 is referred to as the second direction H2.

The CPU 581 drives the pump 579. In this case, the liquid 18 flows in the order of the heat exchanger 50, the flow path 510, the flow path 13, the heat pump 2, the flow path 14, the flow path 513, and the heat exchanger 50, and circulates in the path. More specifically, the liquid 18 flows into the heat exchanger 50 through the flow path 513 and flows out of the flow path 510. The liquid 18 flows into the heat pump 2 through the flow path 13 and flows out of the flow path 14. The direction in which the liquid 18 flows is defined as the direction H3. The heat exchanger 50 uses the heat of the groundwater 17 to cool or heat the inflowing liquid 18. The heat pump 2 uses the heat of the inflowing liquid 18 to cool or heat the fluid 16.

The fluid 16 flows in the order of the heat pump 2, the flow path 11, the indoor unit 10, the flow path 12, and the heat pump 2, and circulates in the path. The direction in which the fluid 16 flows is defined as the direction H4. In the indoor unit 10, the air is cooled or heated by heat exchange with the cooled or heated fluid 16, and the room 781 is cooled or heated.

In this way, the room 781 is cooled or heated. The temperature of the groundwater 17 of the first well 81 and the second well 82 is more stable than the air temperature of the outside air. Therefore, the efficiency of the heat pump is improved as compared with the case where the room 781 is cooled or heated by exchanging heat with the outside air.

Backwashing will be described with reference to FIG. When the groundwater 17 flows in the first direction H1 during cooling or heating of the room 781, the groundwater 17 flows out from the outlet 142 to the second well 82. If the flow of the groundwater 17 to the first direction H1 is continued, foreign matter or the like may accumulate in the second well 82 or the like, making it difficult for the groundwater 17 to flow. Therefore, the groundwater 17 is pumped from the second well 82 and backwashed by flowing the groundwater 17 in the direction opposite to the first direction H1, reducing the possibility that the groundwater 17 becomes difficult to flow.

Further, a specific description will be given. The wall portion forming the periphery of the second well 82 may be formed in a mesh shape or a round hole, for example. Groundwater 17 flows in and out between the stratum around the second well 82 and the second well 82 through the wall portion. If the flow of the groundwater 17 to the first direction H1 is continued, foreign matter may accumulate around the wall forming the periphery of the second well 82 and the outflow port 142, making it difficult for the groundwater 17 to flow. is there. Therefore, there is a possibility that the groundwater 17 is pumped from the second well 82 and backwashed by flowing the groundwater 17 in the direction opposite to the first direction H1, foreign substances are removed in the second well 82, and the groundwater 17 becomes difficult to flow. Is reduced.

If the flow of groundwater 17 in the first direction H1 is continued, foreign matter may collect in the flow path from the first well 81 to the second well 82. When backwashing is performed, the groundwater 17 also flows in the opposite direction in a part of the flow path from the first well 81 to the second well 82, so that the flow path is also washed. Therefore, the possibility that the groundwater 17 will not flow easily in the flow path can be reduced.

When performing this backwash, the CPU 581 opens the electric valves 561, 562, 565, 567, closes the electric valves 563, 564, 566, 568, and drives the pump 152. In this case, the groundwater 17 is pumped from the second well 82 and is drained through the flow path 903, the flow path 505, the flow path 504, the heat exchanger 50, the flow path 501, the flow path 508, and the outflow port 551. It is discharged to 599. In this backwash, the direction in which the groundwater 17 pumped from the second well 82 and discharged from the outflow port 551 flows is referred to as the backwash direction H5 (see FIG. 4). The groundwater 17 discharged to the drainage drain pan 599 is discharged to the outside of the heat exchange unit 5 via the discharge flow path 515.

When the groundwater 17 flows in the second direction H2 during cooling or heating of the room 781, the groundwater 17 flows out from the outflow port 141 to the first well 81. If the flow of the groundwater 17 to the second direction H2 is continued, foreign matter or the like may accumulate in the first well 81 or the like, making it difficult for the groundwater 17 to flow. Therefore, groundwater 17 is pumped from the first well 81, and backwashing is performed in which the groundwater 17 flows in the direction opposite to the second direction H2 to reduce the possibility that the groundwater 17 becomes difficult to flow. As in the case of the second well 82 described above, the wall portion forming the periphery of the first well 81 may be formed in a mesh shape or a round hole, for example. However, by performing backwashing, the wall portion forming the periphery of the first well 81 and the foreign matter accumulated around the outflow port 141 are removed, and the possibility that the groundwater 17 becomes difficult to flow is reduced. .. In addition, a part of the flow path from the second well 82 to the first well 81 is also washed by the backwash.

When performing this backwash, the CPU 581 opens the motor-operated valves 561,562,563,568, closes the motor-operated valves 564,565,566,567, and drives the pump 151. In this case, the groundwater 17 is pumped from the first well 81 and is drained through the flow path 901, the flow path 502, the flow path 501, the heat exchanger 50, the flow path 504, the flow path 509, and the outflow port 552. It is discharged to 599. In this backwash, the direction in which the groundwater 17 pumped from the first well 81 and discharged from the outlet 552 flows is referred to as the backwash direction H6 (see FIG. 4). The groundwater 17 discharged to the drainage drain pan 599 is discharged to the outside of the heat exchange unit 5 via the discharge flow path 515.

In the present embodiment, intermittent backwashing is performed in which the groundwater 17 is intermittently flowed in the reverse direction to wash the first well 81 or the second well 82. Intermittent backwashing is, for example, a backwashing in which the backwashing is repeated for 10 minutes, the backwashing is stopped for 10 minutes, the backwashing is performed again for 10 minutes, and the backwashing is stopped for 10 minutes.

The processing executed by the CPU 581 and the CPU 211 will be described. First, the outdoor unit processing executed by the CPU 211 of the outdoor unit 20 will be described with reference to FIG. When the power of the outdoor unit 20 is turned on, the CPU 211 reads the outdoor unit processing program from the ROM 212 and expands it into the RAM 213. The CPU 211 performs the outdoor unit processing according to the outdoor unit processing program.

In the outdoor unit processing, first, it is determined whether or not to start cooling or heating (S11). When cooling or heating is not started (S11: NO), the device waits. For example, when the operation unit 101 of the indoor unit 10 is operated by the user and an instruction to start cooling or heating is input, the CPU 211 determines to start cooling or heating (S11: YES). Further, for example, when the difference between the temperature of the room 781 and the set temperature becomes equal to or higher than a predetermined temperature and the CPU 211 determines to start cooling or heating, it is determined to start cooling or heating (S11: YES). ).

When it is determined to start cooling or heating (S11: YES), a start instruction signal, which is a signal indicating a cooling or heating start instruction, is transmitted to the CPU 581 of the heat exchange unit 5 (S12). The transmitted start instruction signal is received in the process of S21 of the CPU 581 (see FIG. 6).

Then, cooling or heating is started (S13). More specifically, the heat pump 2 and the indoor unit 10 are driven. In the heat pump 2, heat exchange between the liquid 18 and the fluid 16 is performed. The fluid 16 is sent to the indoor unit 10, and the indoor unit 10 cools or heats the indoor 781.

Next, it is determined whether or not to stop cooling or heating (S14). If the cooling or heating is not stopped (S14: NO), the process returns to S14. That is, cooling or heating is continued. For example, when the operation unit 101 is operated by the user and an instruction to stop cooling or heating is input, it is determined that cooling or heating is stopped (S14: YES). Further, for example, when the temperature of the room 781 reaches the set temperature and the CPU 211 determines that the cooling or heating is stopped, it is determined that the cooling or heating is stopped (S14: YES). Next, a stop instruction signal, which is a signal indicating a stop instruction for cooling or heating, is transmitted to the CPU 581 (S15). The transmitted stop instruction signal is received in the process of S42 of the CPU 581 (see FIG. 7).

Then, cooling or heating is stopped (S16). More specifically, the drive of the heat pump 2 and the indoor unit 10 is stopped. Then, the process returns to S11.

The main processing by the CPU 581 of the heat exchange unit 5 will be described with reference to FIGS. 6 and 7. When the power of the heat exchange unit 5 is turned on, the CPU 581 reads the main processing program from the ROM 582 and expands it into the RAM 583. The CPU 581 performs the main process according to the program of the main process.

In the main process, it is first determined whether or not to start cooling or heating (S21). When cooling or heating is not started (S21: NO), it is determined whether or not the predetermined time “T3” (see FIG. 3) for starting intermittent backwashing has been reached (S22). The predetermined time "T3" is set to a time when the groundwater utilization system 1 is stopped, for example, at night. The predetermined time can be set by the user operating the operation unit 101. If the predetermined time “T3” for starting the intermittent backwash is not reached (S22: NO), the process returns to S21.

When the start instruction signal transmitted in the process of S12 (see FIG. 5) is received, it is determined that cooling or heating is started (S21: YES), and the supply direction of the groundwater 17 to the heat exchanger 50 is first. Whether to set the direction H1 or the second direction H2 is determined (S23).

For example, when the supply direction is changed every day, if the groundwater 17 is flowed in the second direction H2 on the previous day, it is determined that the groundwater is flowed in the first direction H1. Further, when the groundwater 17 is flowed in the first direction H1 on the previous day, it is determined that the groundwater 17 is flowed in the second direction H2. Further, when the supply direction is set in advance by the user, it is determined that the groundwater 17 flows in the set direction. In the present embodiment, as an example, when the groundwater 17 is pumped and drained again in S24 after the intermittent backwashing is performed in S45 or S49 (see FIG. 7), the first well 81 and the second well Of 82, it is assumed that the direction in which the groundwater 17 flows is determined so that the groundwater 17 is pumped from the same well where the groundwater 17 is pumped when the intermittent backwash is performed.

Next, the pump 151 or the pump 152 is controlled, and the groundwater 17 is supplied to the heat exchanger 50 (S24). When it is determined in S23 to supply the groundwater 17 to the first direction H1, the pump 151 is driven and the groundwater 17 is supplied to the heat exchanger 50 from the first well 81 (S24). The groundwater 17 discharged from the heat exchanger 50 is discharged from the outflow port 142 to the second well 82. When it is determined in S23 that the groundwater 17 is supplied to the second direction H2, the pump 152 is driven and the groundwater 17 is supplied to the heat exchanger 50 from the second well 82 (S24). The groundwater 17 discharged from the heat exchanger 50 is discharged from the outflow port 141 to the first well 81. That is, in S24, the groundwater 17 is pumped from one of the first well 81 and the second well 82, and the groundwater 17 is discharged to the other well via the flow path. When the groundwater 17 is flowed in the first direction H1 or the second direction H2, the motorized valves 561 to 568 are opened and closed as described above.

Next, the pump 579 is controlled and the liquid 18 is fed (S25). As a result, the liquid 18 is supplied to the heat exchanger 50, and the liquid 18 after the heat exchange is supplied to the heat pump 2.

Next, the heat exchanger 50 is controlled, and heat exchange between the groundwater 17 and the liquid 18 is started (S26). As a result, heat exchange is performed in the heat exchanger 50 and the heat pump 2, and the room 781 is cooled or heated. Next, the measurement of the operating time, which is the time for the groundwater 17 to flow, is started (S27). The operation time is cumulatively measured until the operation time is set to "0" in the process of S47 described later. That is, when the measurement of the operation time is once started in S27 and the measurement of the operation time is stopped in S43 described later, and S27 is executed again, the time starts from the continuation of the operation time in which the measurement is stopped in S43. Are accumulated.

Next, as shown in FIG. 7, the first temperature, which is the temperature of the groundwater 17 flowing into the heat exchanger 50, is measured (S28). When the groundwater 17 is flowing in the first direction H1 (see FIG. 1), the first temperature is measured based on the output of the temperature sensor 571. When the groundwater 17 is flowing in the second direction H2 (see FIG. 2), the first temperature is measured based on the output of the temperature sensor 572.

The second temperature, which is the temperature of the groundwater 17 flowing out of the heat exchanger 50, is measured (S29). When the groundwater 17 is flowing in the first direction H1, the second temperature is measured based on the output of the temperature sensor 572. When the groundwater 17 is flowing in the second direction H2, the second temperature is measured based on the output of the temperature sensor 571.

Next, the flow rate of the groundwater 17 by the pumps 151 and 152 is adjusted based on the temperature difference between the first temperature acquired in S28 and the second temperature acquired in S29 (S30). As a result, the groundwater 17 is supplied to the heat exchanger 50 at the adjusted flow rate. For example, the CPU 581 adjusts the flow rate of the groundwater 17 so that the temperature difference between the first temperature and the second temperature becomes constant (for example, 5 degrees).

Next, the third temperature, which is the temperature of the liquid 18 flowing into the heat exchanger 50, is measured (S31). In S31, the third temperature is measured based on the output of the temperature sensor 574.

Next, the fourth temperature, which is the temperature of the liquid 18 flowing out of the heat exchanger 50, is measured (S32). In S32, the fourth temperature is measured based on the output of the temperature sensor 573.

Next, the flow rate of the liquid 18 by the pump 579 is adjusted based on the temperature difference between the third temperature acquired in S31 and the fourth temperature acquired in S32 (S33). As a result, the liquid 18 is supplied to the heat exchanger 50 at the adjusted flow rate. For example, the CPU 581 adjusts the flow rate of the liquid 18 so that the temperature difference between the third temperature and the fourth temperature becomes constant (for example, 5 degrees).

Next, the pressure of the groundwater 17 flowing into the heat exchanger 50 is measured (S34). When the groundwater 17 is flowing in the first direction H1, the pressure of the groundwater 17 flowing into the heat exchanger 50 is measured based on the output of the pressure sensor 576. When the groundwater 17 is flowing in the second direction, the pressure of the groundwater 17 flowing into the heat exchanger 50 is measured based on the output of the pressure sensor 577.

Next, it is determined whether or not the pressure of the groundwater 17 acquired in S34 is equal to or higher than the predetermined pressure (S35). The predetermined pressure is set to, for example, a pressure at which the heat exchanger 50 is clogged with foreign matter and the groundwater 17 becomes difficult to flow, so that the pressure rises and the heat exchanger 50 needs to be replaced. The predetermined pressure is stored in the RAM 583. The predetermined pressure is, for example, 0.2 MPaG. When the pressure of the groundwater 17 acquired in S34 is not equal to or higher than the predetermined pressure (S35: NO), the treatment of S37 described later is executed.

When the pressure of the groundwater 17 acquired in S34 is equal to or higher than a predetermined pressure (S35: YES), notification is performed (S36). In this embodiment, the alarm 589 (see FIGS. 1 and 2) lights up. This makes it possible to notify the user that it is time to replace the heat exchanger 50. The determination of clogging of the heat exchanger 50 in S35 may be based on the pressure difference (pressure loss) of the heat exchanger 50. For example, when the pressure difference between the pressure sensor 576 and the pressure sensor 577 becomes a predetermined pressure difference (for example, 0.1 Mpa) or more (S35: YES), the process of S36 described later may be executed.

Next, of the first well 81 and the second well 82, the water level of the groundwater 17 in the well from which the groundwater 17 is discharged is detected (S37). In S37, when the groundwater 17 is flowing in the first direction H1, the water level of the groundwater 17 in the second well 82 is detected based on the output of the water level sensor 972. When the groundwater 17 is flowing toward the second direction H2, the water level of the groundwater 17 in the first well 81 is detected based on the output of the water level sensor 971. In this hands-on mode, since the water level sensors 971 and 972 are switch type, it is detected whether or not the water surface 811 and 821 of the groundwater 17 have reached the positions of the water level sensors 971 and 972.

Next, among the first well 81 and the second well 82, it is determined whether or not the amount of increase in the water level of the groundwater 17 in the well from which the groundwater 17 is discharged is equal to or greater than the predetermined amount of increase (S38). When the groundwater 17 is flowing toward the first direction H1, it is determined whether or not the amount of increase in the water level of the second well 82 is equal to or greater than the predetermined amount of increase "K21" (see FIG. 3) of the second well 82. (S38). When it is detected in S37 that the water surface 821 of the groundwater 17 has reached the position of the water level sensor 972, the amount of increase in the water level of the groundwater 17 in the second well 82 from which the groundwater 17 is discharged is the predetermined amount of increase "K21". It is determined that the above is the case (S38: YES). Further, when the groundwater 17 is flowing toward the second direction H2, whether or not the amount of increase in the water level of the first well 81 is equal to or greater than the predetermined amount of increase “K11” (see FIG. 3) of the first well 81. Is determined (S38). When it is detected in S37 that the water level 811 of the groundwater 17 has reached the position of the water level sensor 971, the amount of increase in the water level of the groundwater 17 in the first well 81 from which the groundwater 17 is discharged is the predetermined amount of increase "K11". It is determined that the above is the case (S38: YES).

Of the first well 81 and the second well 82, when the amount of increase in the water level of the groundwater 17 in the well where the groundwater 17 is discharged is not equal to or higher than the predetermined amount (S38: NO), the operation in which the measurement is started in S27 It is determined whether or not the time is equal to or longer than the first predetermined time "T1" (see FIG. 3) (S39). The first predetermined time "T1" is, for example, 48 hours.

When the operation time at which the measurement is started in S27 is not equal to or longer than the first predetermined time "T1" (S39: NO), it is determined whether to stop the cooling or heating (S42). In S42, when the stop instruction signal transmitted in S15 (see FIG. 5) is received, it is determined that the cooling or heating is stopped. If the cooling or heating is not stopped (S42: NO), the process returns to S28.

When the amount of increase in the water level of the groundwater 17 in the well where the groundwater 17 is discharged out of the first well 81 and the second well 82 is equal to or greater than the predetermined amount (S38: YES), the process proceeds to S40. If the operation time is equal to or longer than the first predetermined time "T1" (S39: YES), the process proceeds to S40. In S40, the backwash flag M is set to "1" and stored in the RAM 583. The backwash flag M is a variable for determining whether or not to perform backwash. When the backwash flag M is "1", intermittent backwash is executed in the process of S45 (see FIG. 6) described later.

Next, it is determined whether or not the operation time at which the measurement is started in S27 is equal to or longer than the second predetermined time "T2" (see FIG. 3) (S41). The second predetermined time "T2" is, for example, 72 hours. If it is not equal to or longer than the second predetermined time “T2” (see FIG. 3) (S41: NO), the process proceeds to S42.

When the cooling or heating is stopped (S42: YES), the cooling or heating operation is stopped (S43). In S43, the pumps 151 and 152 and the pump 579 are stopped. As a result, the operation of pumping the groundwater 17 from one of the first well 81 and the second well 82 and discharging the groundwater 17 to the other well through the flow path is stopped. Further, the feeding of the liquid 18 is stopped. In addition, the operation of the heat exchanger 50 is also stopped. In addition, the measurement of the operating time started in S27 is stopped. The operation of the heat pump 2 and the indoor unit 10 is also stopped by the control of the CPU 211 of the outdoor unit 20 (see S16 in FIG. 5). The process then returns to S21 (see FIG. 6).

As shown in FIG. 6, when it is determined in S22 that the predetermined time "T3" (see FIG. 3) has been reached (S22: YES), it is determined whether or not the backwash flag M is "1". Therefore, it is determined whether or not to perform the backwash (S44). When the backwash flag M is "0", it is determined that the backwash is not executed (S44: NO), and the process returns to S21.

When the backwash flag M is "1", it is determined that the backwash is executed (S44: YES), and the intermittent backwash is executed (S45). In the present embodiment, as an example, the operation of performing backwashing for 10 minutes and stopping backwashing for 10 minutes is repeated 5 times. That is, the backwash for 10 minutes is performed 5 times.

When the intermittent backwashing is completed, the backwashing flag M is set to "0" and stored in the RAM 583 (S46). Next, the operating time at which the measurement was started in S27 is set to "0" (S47). Then, the process returns to S21. In this way, the operation of the groundwater utilization system 1 is stopped (that is, the operation of pumping the groundwater 17 from one well and discharging the groundwater 17 to the other well through the flow path is stopped, and the cooling or heating is performed. Intermittent backwashing is performed while the system is stopped (for example, at night) (S45).

In the state where the groundwater utilization system 1 is operating, if the operation time becomes "T2" or more in the second predetermined time in S41 (S41: YES), the cooling or heating operation is stopped as in S43. Is done (S48). As a result, the operation of pumping the groundwater 17 from one well and discharging the groundwater 17 to the other well via the flow path is stopped. Then, as in S45, intermittent backwashing is performed (S49). Then, as in S46, the backwash flag M is set to "0" (S50). Then, similarly to S47, the operating time at which the measurement was started in S27 is set to "0" (S51). Then, the process returns to S23.

As described above, when the heating / cooling stop instruction is not input in S42 and the operation time becomes "T2" for the second predetermined time (S41: YES), the operation of the groundwater utilization system 1 is forcibly stopped (S41: YES). S48), intermittent backwashing is performed (S49). Then, when the intermittent backwashing is completed, the operation (that is, cooling or heating) of the groundwater utilization system 1 is automatically started (S23 to S27).

If the groundwater 17 is pumped and drained again in S24 after the intermittent backwash is performed in S45 or S49, the intermittent backwash is performed in the first well 81 and the second well 82. Groundwater 17 is pumped from the same well where the groundwater 17 is pumped when it is broken. That is, in the intermittent backwashing of S45 or S49, when the groundwater 17 is pumped from the second well 82 (backwashing direction H5 in FIG. 4), the groundwater 17 is pumped from the second well 82 in S24 (backwashing direction H5 in FIG. 4). Second direction H2) in FIG. In the intermittent backwashing of S45 or S49, when the groundwater 17 is pumped from the first well 81 (backwashing direction H6 in FIG. 4), the groundwater 17 is pumped from the first well 81 in S24 (FIG. 1). First direction H1).

As described above, the processing in the present embodiment is executed. In the present embodiment, the heat exchange unit 5 includes a case portion 590. Further, the heat exchange unit 5 includes a heat exchanger 50 that exchanges heat between the groundwater 17 and the liquid 18. Further, the heat exchange unit 5 includes a CPU 581 that controls the pump 151 or the pump 152 and supplies the groundwater 17 to the heat exchanger 50. Further, the heat exchange unit 5 includes a CPU 581 that controls the pump 579 and supplies the liquid 18 to the heat exchanger 50. The CPU 581 and the heat exchanger 50 are provided inside the case portion 590. That is, the CPU 581 that controls the supply of the groundwater 17 and the liquid 18 to the heat exchanger 50, the heat exchanger 50, and the case portion 590 are provided in one heat exchange unit 5. Therefore, when performing on-site installation work, the CPU 581, which is the first control means for controlling the supply of groundwater 17 to the heat exchanger 50, and the liquid 18 by simply installing one heat exchange unit 5. The CPU 581, which is a second control means for controlling the supply to the heat exchanger 50, and the heat exchanger 50 can be installed. That is, the CPU 581 and the heat exchanger 50 can be installed only by installing the heat exchange unit 5 produced in advance at a manufacturing factory or the like. Therefore, the first control means for supplying the groundwater 17 to the heat exchanger 50, the second control means for supplying the liquid 18 to the heat exchanger 50, and the heat exchanger 50 are separately provided, and the case portion is provided. Compared with the case where the 590 is not provided, the man-hours for the installation work are reduced. In addition, the man-hours for creating a design drawing for installation work are reduced. Therefore, the cost of installation work can be reduced.

Further, the CPU 581 is one component arranged on one control panel 580. That is, the first control means for controlling the supply of the groundwater 17 to the heat exchanger 50 and the second control means for controlling the supply of the liquid 18 to the heat exchanger 50 are provided by the CPU 581, which is one component. It is configured and arranged on one control panel 580. Therefore, when the first control means for supplying the groundwater 17 to the heat exchanger 50 and the second control means for supplying the liquid 18 to the heat exchanger 50 are separate parts and are arranged in separate control panels. The number of control panels is reduced, and the cost of the heat exchange unit 5 can be reduced.

Further, the pumps 151 and 152 are pumps capable of adjusting the flow rate of the groundwater 17. Then, the first temperature is measured (S28), and the second temperature is measured (S29). The pumps 151 and 152 are controlled based on the temperature difference between the first temperature and the second temperature, and the flow rate of the groundwater 17 is adjusted (S30). Therefore, when the flow rate of the groundwater 17 can be reduced, the flow rate can be reduced to reduce the power consumption of the pumps 151 and 152. Therefore, the power consumption is reduced as compared with the case where the groundwater 17 is constantly flowed at a constant flow rate without adjusting the flow rate of the groundwater 17. Therefore, the operating cost of the heat exchange unit 5 and the groundwater utilization system 1 can be reduced.

Further, the pump 579 is a pump capable of adjusting the flow rate of the liquid 18. Then, the third temperature is measured (S31), and the fourth temperature is measured (S32). The flow rate of the liquid 18 is adjusted based on the temperature difference between the third temperature and the fourth temperature (S33). Therefore, when the flow rate of the liquid 18 can be reduced, the flow rate can be reduced to reduce the power consumption of the pump 579. Therefore, the power consumption is reduced as compared with the case where the groundwater 17 is constantly flowed at a constant flow rate without adjusting the flow rate of the liquid 18. Therefore, the operating cost of the heat exchange unit 5 and the groundwater utilization system 1 can be reduced.

Further, the heat exchanger 50 can be replaced by a flange connection. Therefore, when the heat exchanger 50 is clogged with foreign matter and needs to be replaced, it is not necessary to cut and weld the piping in the heat exchange unit 5. In addition, there is no need to clean the heat exchanger, which is expensive, such as disassembly cleaning, chemical cleaning, and neutralization treatment. Therefore, the replacement cost when the heat exchanger 50 deteriorates is reduced. As a result, the maintenance cost of the heat exchange unit 5 and the groundwater utilization system 1 is reduced.

Further, the pressure of the groundwater 17 flowing into the heat exchanger 50 is measured (S34). When the measured pressure is equal to or higher than the predetermined pressure (S35: YES), it is notified (S36). When the heat exchanger 50 is clogged with foreign matter, the pressure of the groundwater flowing into the heat exchanger rises above a predetermined pressure. In this case, since the notification is given, the user can easily determine that it is time to replace the heat exchanger 50. Therefore, the convenience of the user is improved. The user may, for example, replace the heat exchanger 50, replace the entire heat exchange unit 5, or replace the filter inside the heat exchanger 50, so that the heat exchanger 50 is clogged with foreign matter. Can be in a non-existent state.

Further, inside the case portion 590, the flow paths 501 to 506 of the groundwater 17, the flow paths 510 and 513 of the liquid 18, and the heat exchanger 50 are provided. A heat insulating material 598 is provided on the case portion 590. Therefore, the flow paths 501 to 506 of the groundwater 17 provided inside the case portion 590, the flow paths 510 of the liquid 18, and the heat exchanger 50 are protected from the air temperature outside the heat exchange unit 5 by the heat insulating material 598. Will be done. Since the heat insulating material 598 is provided, it is not necessary to arrange the heat insulating material individually for the flow paths 501 to 506 of the groundwater 17, the flow paths 510 and 513 of the liquid 18, and the heat exchanger 50. Therefore, the cost can be reduced as compared with the case where the heat insulating material is individually arranged in the flow paths 501 to 506 of the groundwater 17, the flow paths 510 and 513 of the liquid 18, and the heat exchanger 50. Further, when the heat exchange unit 5 is arranged on site, it is not necessary to construct the heat insulating material on site. Therefore, the construction period can be shortened and the cost of installation work can be reduced.

An air bleeding valve 941 with a check valve is provided in the flow path of the groundwater 17. In this case, the air contained in the flow path of the groundwater 17 of the heat exchange unit 5 can be removed. Further, even when the pumps 151 and 152 are stopped, the possibility that the groundwater 17 in the flow path will flow out can be reduced. Therefore, the pump power at the start of driving the pumps 151 and 152 can be reduced, and the siphon effect eliminates the need for pumping water and only the piping resistance of the flow path.

Further, the CPU 581 pumps groundwater 17 from one of the first well 81 and the second well 82, and discharges the groundwater 17 to the other well via the flow path (S24). Further, the CPU 581 executes intermittent backwashing in which the groundwater 17 is intermittently flowed in the reverse direction to wash the first well 81 or the second well 82 (S45). Since the groundwater 17 is intermittently flowed when the backwash is performed, the water flow changes as compared with the case where the backwash is performed at a constant flow rate, and the pumped water of the first well 81 or the second well 82 is pumped. The effectiveness of the well cleaning performed is improved.

Further, when the amount of increase in the water level of the groundwater 17 in the well where the groundwater 17 is discharged out of the first well 81 and the second well 82 is equal to or more than a predetermined amount (S38: YES), intermittent backwashing is performed. It is executed (S44). When the amount of increase in the water level of the groundwater 17 exceeds a predetermined amount, the same well is drained for a long time, and the flow path of the groundwater 17 and the first well 81 or the second well 82 from which the groundwater 17 is discharged are discharged. There is a high possibility that foreign matter has accumulated in the well. In this case, since intermittent backwashing is automatically performed, it is not necessary for the user to manually perform intermittent backwashing. Therefore, the convenience of the user is improved.

Further, the operating time, which is the time during which the groundwater 17 from which the liquid feeding has been started in S24 is flown, is measured (S27). When the operating time is equal to or longer than the first predetermined time "T1" (S39: YES), intermittent backwashing is performed (S45). When the operation time becomes "T1" or more for the first predetermined time, the intermittent backwash is automatically performed, so that the user does not need to manually perform the intermittent backwash. Therefore, the convenience of the user is improved.

Further, the pumping and drainage of the groundwater 17 started in S27 is stopped in S43. While the pumping and drainage of the groundwater 17 is stopped, intermittent backwashing is executed when a predetermined time is reached (S22: YES) (S45). In this case, backwashing is performed while the pumping and draining of the groundwater 17 is stopped. Therefore, it is possible to prevent backwashing from being performed during the time when the groundwater 17 is being pumped and drained.

Further, when it is determined that the operation time is equal to or longer than the first predetermined time "T1" (S39: YES), and when the pumping and drainage of the groundwater 17 started in S24 is stopped (S43), the operation is intermittent. Backwashing is performed (S45). Further, when the operating time is longer than the first predetermined time "T1" and is equal to or longer than the second predetermined time "T2" (S41: YES), the pumping and draining of the groundwater 17 is stopped (S48), and the operation is intermittent. Backwashing is performed (S49). As described above, in the present embodiment, when the first predetermined time "T1" has elapsed and the pumping and drainage of the groundwater 17 is stopped, the intermittent backwashing is performed (S45). Since the intermittent backwashing is performed when the groundwater 17 is not pumped and drained, it is possible to prevent the operation of the groundwater pumping and draining from being hindered. On the other hand, if the pumping and draining of the groundwater 17 is not stopped even after the first predetermined time "T1" has passed and the second predetermined time "T2" has passed (S41: YES), the pumping and draining of the groundwater Is stopped (S48), and intermittent backwashing is forcibly performed (S49). Therefore, even if the second predetermined time "T2" elapses, the amount of foreign matter and the like accumulated in the well and the flow path can be reduced as compared with the case where the intermittent backwashing is not performed.

Further, when the groundwater 17 is pumped and drained again in S24 after the intermittent backwash is performed in S45 or S49, the intermittent backwash is performed in the first well 81 and the second well 82. Groundwater 17 is pumped from the same well where the groundwater 17 is pumped when it is broken. In this case, of the first well 81 and the second well 82, the well in which the groundwater was pumped before the intermittent backwashing is performed becomes the well in which the drainage is performed after the intermittent backwashing. In addition, a well from which groundwater was drained before intermittent backwashing becomes a well from which groundwater is pumped after intermittent backwashing. Therefore, as compared with the case where one of the first well 81 and the second well 82 is constantly pumped and the other well is constantly drained, the pumping and draining of the first well 81 and the second well 82 are performed. The balance of the load is improved. Therefore, it is possible to reduce the possibility that foreign matter or the like will continue to accumulate in the well that is constantly drained. Further, since one of the pumps 151 of the first well 81 and the pumps 152 of the second well 82 is not continuously used, the useful life of the pumps 151 and 152 is extended.

In the above embodiment, the first well 81 and the second well 82 are examples of the "well" of the present invention. The liquid 18 is an example of the "liquid" of the present invention. Pumps 151 and 152 are examples of the "first pump" of the present invention. The pump 579 is an example of the "second pump" of the present invention. The CPU 581 that performs the processing of S24 and S30 is an example of the "first control means" of the present invention. The CPU 581 that performs the processing of S25 and S33 is an example of the "second control means" of the present invention. The CPU 581 that performs the processing of S28 is an example of the "first temperature measuring means" of the present invention. The CPU 581 that performs the processing of S29 is an example of the "second temperature measuring means" of the present invention. The CPU 581 that performs the processing of S31 is an example of the "third temperature measuring means" of the present invention. The CPU 581 that performs the processing of S32 is an example of the "fourth temperature measuring means" of the present invention. The CPU 581 that performs the processing of S34 is an example of the "pressure measuring means" of the present invention. The CPU 581 that performs the processing of S35 is an example of the "first clogging determination means" of the present invention. The CPU 581 that performs the processing of S36 is an example of the "first notification means" of the present invention.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the first control means for controlling the supply of groundwater 17 to the heat exchanger 50 and the second control means for controlling the supply of the liquid 18 to the heat exchanger 50 are one component of the CPU 581. There was, but it is not limited to this. The first control means for controlling the supply of the groundwater 17 to the heat exchanger 50 and the second control means for controlling the supply of the liquid 18 to the heat exchanger 50 may be separate CPUs. The separate CPUs may be arranged on separate control panels.

Further, the pumps 151 and 152 were controlled based on the temperature difference between the first temperature and the second temperature, and the flow rate of the groundwater 17 was adjusted, but the flow rate of the groundwater 17 was not adjusted based on the temperature difference. May be good. Further, the pumps 151 and 152 may be pumps that cannot adjust the flow rate of the groundwater 17 and send the groundwater 17 at a constant flow rate.

The pump 579 was controlled and the flow rate of the liquid 18 was adjusted based on the temperature difference between the third temperature and the fourth temperature, but the flow rate of the liquid 18 may not be adjusted based on the temperature difference. Further, the pump 579 may be a pump that cannot adjust the flow rate of the liquid 18 and sends the liquid 18 at a constant flow rate.

Further, the pressure of the groundwater 17 flowing into the heat exchanger 50 was measured (S34), and when the measured pressure was equal to or higher than the predetermined pressure (S35: YES), it was notified (S36), but this is limited to this. Not done. For example, the pressure of the groundwater 17 flowing out of the heat exchanger 50 may be measured. Even in this case, when the heat exchanger 50 is clogged with foreign matter, the pressure of the groundwater flowing out to the heat exchanger rises above a predetermined pressure. Then, when the pressure is equal to or higher than the predetermined pressure, the notification is given, so that the user can easily determine that it is time to replace the heat exchanger 50. Therefore, the convenience of the user is improved. Further, in S35, it is sufficient to determine whether or not the heat exchanger 50 is clogged based on the pressure of the groundwater 17, and other methods of the above embodiment may be used. For example, in S34, the pressure of the groundwater 17 flowing into the heat exchanger 50 and the pressure of the groundwater 17 flowing out are measured, and the pressure of the groundwater 17 flowing into the heat exchanger 50 and the groundwater 17 flowing out are measured. It may be determined whether or not the heat exchanger 50 is clogged based on the pressure difference from the pressure of (S35). For example, when the pressure difference is equal to or greater than a predetermined value (for example, 0.1 Mpa) (S35: YES), it is notified (S36).

Further, when the notification is made in S36, the notification device 589 is lit, but the notification is not limited to this. For example, a sound may be emitted from the operation unit 588 or the alarm 589. Further, the alarm 589 may not be provided. Further, the pressure of the groundwater 17 flowing in or out of the heat exchanger 50 does not have to be measured.

Further, the case portion 590 is provided with the heat insulating material 598, but the present invention is not limited to this. The heat insulating material 598 may not be provided. Further, the heat exchanger 50 may be provided inside the case portion 590, and other parts such as the control panel 580 may be provided outside the case portion 590. For example, the CPU 581 may be provided on the outer surface of the case portion 590. In this case, as an example, as shown by the dotted line in FIG. 8, a storage unit 986 for storing the control panel 580 including the CPU 581 may be provided, and the storage unit 986 may be fixed to the outer surface of the case unit 590. In this case, the control panel 580 inside the case portion 590 may not be provided. Even when the CPU 581 is provided on the outer surface of the case portion 590, the CPU 581 that controls the supply of the groundwater 17 and the liquid 18 to the heat exchanger 50, the heat exchanger 50, and the case portion 590 exchange one heat. Since it is provided in the unit 5, the cost of installation work can be reduced.

The position of the control panel 580 arranged on the outer surface or the inner surface of the case portion 590 is not limited to the case of FIG. Further, a storage unit 986 for storing the control panel 580 and an operation unit 588 are separately provided, but the present invention is not limited to this. For example, the operation unit 588 may be arranged on the surface of the storage unit 986.

Further, the CPU 581 and the heat exchanger 50 may be provided in one heat exchange unit 5, and other parts may not be included in the heat exchange unit 5. Further, although the outdoor unit 20 which is a device having the heat pump 2 is arranged outside the building 78, the device having the heat pump 2 may be arranged inside the building 78. All or part of the outdoor unit 20 may be integrally or in close contact with the case portion 590. Further, a plurality of outdoor units 20 may be connected to the case portion 590 of one heat exchange unit 5.

Further, the groundwater 17 discharged from the outlets 551 and 552 of the flow paths 508 and 509 was discharged to the outside via the drainage drain pan 599, but the present invention is not limited to this. For example, the drain pan 599 may not be provided. In this case, the flow path connected to the flow paths 508 and 509 may extend to the outside of the case portion 590 and the groundwater 17 may be drained.

Further, the process of S22 does not have to be executed. Further, in the process of S27, the operation time does not have to be measured. The process of S39 does not have to be executed. Further, in S37, the water level of the groundwater 17 does not have to be detected. The process of S38 may not be executed. The backwash may not be automatically executed, and the backwash may be executed when the user inputs the backwash instruction to the heat exchange unit 5 via the operation unit 588.

Further, when intermittent backwashing is performed in S45 and S49, the groundwater 17 is discharged to the drain pan 599, but the present invention is not limited to this. For example, the groundwater 17 may be flushed in the first direction H1 instead of the backwashing in the backwash direction H6. That is, when intermittent backwashing is performed, the groundwater 17 may be flushed so as to be pumped from the first well 81 and reduced to the second well 82. Further, for example, the groundwater 17 may be flushed in the second direction H2 instead of intermittent backwashing in the backwash direction H5. That is, when intermittent backwashing is performed, the groundwater 17 may be flushed so as to be pumped from the second well 82 and reduced to the first well 81. In this case, intermittent backwashing is performed in all the flow paths 501 to 506, 901 to 904 when the groundwater 17 flows in the first direction H1 and the second direction H2.

When intermittent backwashing is performed in S45 and S49, intermittent backwashing is performed in the backwashing direction H6 for the first predetermined time or a predetermined number of times, and then intermittently backwashing in the first direction H1. It may be switched to backwash. Further, the intermittent backwashing in the backwashing direction H5 may be performed for the first predetermined time or a predetermined number of times, and then switched to the intermittent backwashing in the second direction H2. In this case, immediately after the backwash is started, there is a high possibility that foreign matter is mixed in the discharged groundwater 17, so that the drainage can be drained from the drain pan 599. After that, the groundwater 17 can be returned to the first well 81 or the second well 82.

Further, the water level sensor 971 is provided above the water surface 811 and the water level sensor 972 is provided above the water surface 821, but the present invention is not limited thereto. For example, the water level sensor 971 may be provided in the groundwater 17 of the first well 81, and the water level sensor 972 may be arranged in the groundwater 17 of the second well 82. In this case, the water level sensors 971 and 972 detect the water level of the groundwater 17 by measuring the water pressure, for example (S37).

Further, the configuration of each flow path is an example, and is not limited to the case of the present embodiment. A two-way valve or a three-way valve may be combined to form various flow paths different from those of the present embodiment. For example, the direction of the groundwater 17 flowing through the heat exchanger 50 was opposite between the case where the groundwater 17 flows in the first direction H1 and the case where the groundwater 17 flows in the second direction H2 shown in FIG. The flow path may be configured so that the direction of the groundwater 17 flowing through the heat exchanger 50 is always the same. Further, the air bleeding valve 942 may not be provided because air does not enter the flow path as long as the air is bleeded during the test run. Further, the on-off valves 569 and 570 may be electric valves controlled by the CPU 581. Further, the motor-operated valves 561-568 may be on-off valves that can be manually opened and closed. Further, the safety valve 943 and the air bleeding valves 941 and 942 may be operated under the control of the CPU 581.

Further, when intermittent backwashing was performed, the groundwater 17 was flowing through the heat exchanger 50 (see the backwashing direction H5 and the backwashing direction H6 in FIG. 4), but the groundwater 17 did not flow through the heat exchanger 50. May be good. For example, when intermittent backwashing is performed, groundwater 17 may flow in the backwashing direction H7 of FIG. 8 instead of the backwashing direction H5 of FIG. When the groundwater 17 flows in the backwash direction H7, the CPU 581 opens at least the electric valves 565 and 568, closes at least the electric valves 562 and 566, and drives the pump 152. In this case, the groundwater 17 is pumped from the second well 82 and discharged to the drainage drain pan 599 via the flow path 903, the flow path 505, a part of the flow path 504, the flow path 509, and the outflow port 552. The groundwater 17 discharged to the drainage drain pan 599 is discharged to the outside of the heat exchange unit 5 via the discharge flow path 515.

Further, when intermittent backwashing is performed, groundwater 17 may flow in the backwashing direction H8 of FIG. 8 instead of the backwashing direction H6 of FIG. When the groundwater 17 flows in the backwash direction H8, the CPU 581 opens at least the electric valves 563 and 567, closes at least the electric valves 561 and 564, and drives the pump 151. In this case, the groundwater 17 is pumped from the first well 81 and discharged to the drainage drain pan 599 via the flow path 901, the flow path 502, a part of the flow path 501, the flow path 508, and the outflow port 551. The groundwater 17 discharged to the drainage drain pan 599 is discharged to the outside of the heat exchange unit 5 via the discharge flow path 515.

Further, as shown in FIG. 8, an intake port 982 connected to the flow path of the groundwater 17 may be provided, and a faucet 983 may be attached to the intake port 982. In the example shown in FIG. 8, the flow path 981 connected to the flow paths 508 and 509 extends to the case portion 590. The water intake 982 is arranged outside the case portion 590. A generator 984 can be connected to the heat exchange unit 5. A faucet 983 can be attached to the water intake 982. For example, in the event of a disaster, the generator 984 can supply power to the heat exchange unit 5. In this case, the heat exchange unit 5 drives the pump 151 or the pump 152 by the electric power supplied from the generator 984, pumps the groundwater 17 from the wells 81 and 82, and supplies the groundwater 17 from the faucet 983 as disaster water. it can. The water intake port 982 may be connected to the flow path of the groundwater 17, and the flow path to which the water intake port 982 is connected is not limited. Further, an on-off valve for switching between the flow path toward the outlets 551 and 552 and the flow path 981 toward the intake port 982 may be provided. Further, the flow outlets 551 and 552 may not be provided, and the flow paths 508 and 509 may be connected to the flow path 981. In this case, the drainage flowing through the flow paths 508 and 509 may be discharged to the outside of the heat exchange unit 5 via the intake port 982 or the faucet 983. Further, when not in the event of a disaster, the power source supplied to the heat exchange unit 5 is not limited, and power may be supplied from the generator 984 or from the power grid. The faucet 983 may be detachable from the water intake 982.

Further, even when it is determined that the amount of increase in the water level of the groundwater 17 of the well where the groundwater 17 is discharged out of the first well 81 and the second well 82 is equal to or more than the predetermined amount of increase (S38: YES). The discharge of groundwater 17 to the well was continued, but it is not limited to this. For example, as in the modified example shown in FIG. 9, it is determined that the amount of increase in the groundwater level of the well 17 from which the groundwater 17 is discharged is equal to or greater than the predetermined amount of increase among the first well 81 and the second well 82. If this is the case (S38: YES), the groundwater 17 may be discharged to the outside of the first well 81 and the second well 82 (S52).

For example, when the groundwater 17 is flowing in the first direction H1 of FIG. 1, it is determined that the amount of increase in the water level of the groundwater 17 in the second well 82 is equal to or greater than the predetermined amount of increase “K21” (S38: YES), groundwater 17 may be flowed in the same direction as the backwash direction H6 in FIG. 4 (S52). In this case, the groundwater 17 is discharged to the outside of the first well 81 and the second well 82 via the outflow port 552, the drainage drain pan 599, and the discharge flow path 515 (S52). In this case, the opening and closing of the motorized valves 561 to 568 is controlled in the same manner as when the groundwater 17 is flowed in the backwash direction H6 (S52). Since the state in which the groundwater 17 is flowing through the heat exchanger 50 continues, the heat exchange by the heat exchanger 50 can be continued.

Further, for example, when the groundwater 17 is flowing in the second direction H2 of FIG. 1, it is determined that the amount of increase in the water level of the groundwater 17 in the first well 81 is equal to or greater than the predetermined amount of increase “K11” ( S38: YES), groundwater 17 may be flowed in the same direction as the backwash direction H5 in FIG. 4 (S52). In this case, the groundwater 17 is discharged to the outside of the first well 81 and the second well 82 via the outflow port 551, the drainage drain pan 599, and the discharge flow path 515 (S52). In this case, the opening and closing of the motorized valves 561-568 is controlled in the same manner as when the groundwater 17 is flowed in the backwash direction H5 (S52). Since the state in which the groundwater 17 is flowing through the heat exchanger 50 continues, the heat exchange by the heat exchanger 50 can be continued. Note that S52 is not an intermittent backwash.

After the process of S52 is executed, the process proceeds to S40. In the case of the modified example, when it is determined that the amount of increase in the water level of the groundwater 17 in the well in which the groundwater 17 is discharged is equal to or greater than the predetermined amount of increase in the first well 81 and the second well 82 (S38: YES), groundwater 17 is discharged to the outside of the first well 81 and the second well 82 (S52). Therefore, it is possible to prevent the rising amount of the groundwater 17 of the well from which the groundwater 17 is discharged from continuing to increase beyond the predetermined rising amount. Further, it is possible to suppress an increase in the amount of foreign matter and the like accumulated in the first well 81 or the second well 82 from which the groundwater 17 is discharged. Further, the groundwater utilization system 1 can be operated without stopping the pumping from the first well 81 or the second well 82. Therefore, unlike the case of FIG. 10 described later, the pumped groundwater 17 can be discharged to the outside of the first well 81 and the second well 82 without stopping the air conditioning operation by heat exchange.

Further, even when it is determined whether or not the amount of increase in the water level of the groundwater 17 in the well where the groundwater 17 is discharged out of the first well 81 and the second well 82 is equal to or higher than the predetermined amount (FIG. 7). S38: YES), the heating and cooling operation was continued until the stop instruction signal was received in S42. Then, after the stop instruction signal was received in S42 (S42: YES in FIG. 7) and the heating / cooling was stopped (S43 in FIG. 7), intermittent backwashing was executed (S45 in FIG. 6), but this is limited to this. Not done. For example, as in the modified example shown in FIG. 10, it is determined that the amount of increase in the water level of the groundwater 17 of the well in which the groundwater 17 is discharged is equal to or greater than the predetermined amount of increase in the first well 81 and the second well 82. If this is done (S38: YES), heating and cooling may be stopped immediately (S48), and intermittent backwashing may be performed (S49). In this case, the process of S52 in FIG. 9 does not have to be executed. Note that, in FIGS. 9 and 10, the same processing as in FIG. 7 is indicated by the same reference numerals, and detailed description thereof will be omitted.

Further, when the pressure of the groundwater 17 acquired in S34 is equal to or higher than the predetermined pressure (S35: YES in FIG. 7), the notification has been performed (S36 in FIG. 7), but the present invention is not limited to this. The clogging of the heat exchanger 50 may be determined and notified by a method of determining the heat exchange performance based on the average temperature difference or the like. FIG. 11 is a modification of FIG. 7. In FIG. 11, the process of S34 in FIG. 7 is omitted. Then, after the processing of S33, the processing of S351 is executed, and the clogging is determined.

In S351, the average temperature difference is calculated for the heat exchanger 50 based on the temperature at which the ground water 17 flows in, the temperature at which the ground water 17 flows out, the temperature at which the liquid 18 flows in, and the temperature at which the liquid 18 flows out. Based on the average temperature difference, it is determined whether or not the heat exchanger 50 is clogged. Then, when it is determined that the heat exchanger 50 is clogged (S351: YES), a notification is given (S36). If it is determined that the heat exchanger 50 is not clogged (S351: NO), the process proceeds to S37. In the present embodiment, the temperature T01 at which the ground water 17 flows into the heat exchanger 50 is the first temperature measured in S28, and the temperature T02 at which the ground water 17 flows out is measured in S29. The second temperature, the temperature T03 at which the liquid 18 flows in, is the third temperature measured in S31, and the temperature T04 at which the liquid 18 flows out is the fourth temperature measured in S32.

In S351, for example, when the average temperature difference ΔT11 is a predetermined temperature difference (for example, a difference of 10 degrees), it may be determined that the material is clogged. Various calculation methods can be used to calculate the average temperature difference ΔT11 in S351. For example, the average temperature difference ΔT11 may be an arithmetic mean temperature difference as shown in the following equation (1).
ΔT11 = (| T01-T04 | + | T02-T03 |) / 2 ... Equation (1)
Further, the average temperature difference ΔT11 may be a logarithmic mean temperature difference.

Further, in S351, when determining whether or not the heat exchanger 50 is clogged based on the average temperature difference ΔT11, the following equation (2) may be used.
KA = Q / ΔT11 ... Equation (2)
K: Heat transfer rate [W / {(m ^ 2) x K}]
A: Heat transfer area [m ^ 2]
Q: Heat exchange amount [W]
ΔT11: Average temperature difference [K]
Q = ρCVΔT12
ΔT12 = | T04-T03 |
ρ: Density [kg / (m ^ 3)] (for example, liquid 18)
C: Specific heat [J / (kg · K)] (for example, liquid 18)
V: Flow rate [(m ^ 3) / s] (for example, liquid 18)
ΔT12: Temperature difference [K] (for example, liquid 18)
In this modification, when KA is equal to or less than a predetermined value, it is determined to be clogged (S351: YES) and notified (S36).

The following formula (3) may be used instead of the formula (1).
ΔT11 = (| T01-T03 | + | T02-T04 |) / 2 ... Equation (3)
As an example, when the groundwater 17 flows in the first direction H1 (see FIG. 1) and the liquid 18 flows in the direction H3, in the heat exchanger 50, the flows of the groundwater 17 and the liquid 18 are in opposite directions as “countercurrent”. Become. In the case of countercurrent, the above equation (1) may be used. Further, when the groundwater 17 flows in the second direction H2 (see FIG. 1) and the liquid 18 flows in the direction H3, the heat exchanger 50 has a “parallel flow” in which the flows of the groundwater 17 and the liquid 18 are in the same direction. .. The above equation (3) may be used in the case of parallel flow. The above is an example of calculating the average temperature difference, and the average temperature difference may be calculated by another method or other conditions may be added.

When the heat exchanger 50 is clogged with foreign matter, the average temperature difference changes. In this modification, when it is determined that the heat exchanger is clogged based on the average temperature difference (S351: YES), a notification is given (S36), so that the user replaces the heat exchanger 50. It is easy to determine when the time has come. Therefore, the convenience of the user is improved. Further, since it is not necessary to determine the clogging by the pressure, it is possible to reduce the pressure sensors 576 and 577, and the cost can be reduced. In this modification, the CPU 581 that performs the processing of S351 is an example of the "second clogging determination means" of the present invention. The CPU 581 that performs the processing of S36 is an example of the "second notification means" of the present invention.

Further, when backwashing is performed, intermittent backwashing is performed (see S46), but the present invention is not limited to this. For example, the backwash may be continuously performed for a predetermined time (for example, 50 minutes) instead of the intermittent backwash.

1 Groundwater utilization system 2 Heat pump 5 Heat exchange unit 11-14, 501-514, 901-904 Channels 16, 18 Liquid 17 Groundwater 50 Heat exchanger 81 First well 82 Second well 151,152,579 Pumps 210,580 Control panel 571,572,573,574 Temperature sensor 575 Flow meter 576,577 Pressure sensor 211,581 CPU
589 Alarm 590 Case 598 Insulation 971, 972 Water level sensor

Claims (11)

Case part and
A heat exchanger that exchanges heat between groundwater and liquid,
A first control means that controls a first pump that pumps the groundwater from a well and supplies the groundwater to the heat exchanger.
A second control means for controlling the second pump for flowing the liquid and supplying the liquid to the heat exchanger is provided.
The heat exchanger is provided inside the case portion and is provided.
The first control means and the second control means are heat exchange units provided on the outer surface of the case portion or the inside of the case portion. The heat exchange unit according to claim 1, wherein the first control means and the second control means are one component arranged in one control panel. A first temperature measuring means for measuring the first temperature, which is the temperature of the groundwater flowing into the heat exchanger,
A second temperature measuring means for measuring a second temperature, which is the temperature of the groundwater flowing out of the heat exchanger, is provided.
The first pump is a pump capable of adjusting the flow rate of the groundwater.
The first control means is operated by the first pump based on the temperature difference between the first temperature measured by the first temperature measuring means and the second temperature measured by the second temperature measuring means. The heat exchange unit according to claim 1 or 2, wherein the flow rate of the groundwater is adjusted and the groundwater is supplied to the heat exchanger. A third temperature measuring means for measuring a third temperature, which is the temperature of the liquid flowing into the heat exchanger,
A fourth temperature measuring means for measuring a fourth temperature, which is the temperature of the liquid flowing out of the heat exchanger, is provided.
The second pump is a pump in which the flow rate of the liquid can be adjusted.
The second control means is operated by the second pump based on the temperature difference between the third temperature measured by the third temperature measuring means and the fourth temperature measured by the fourth temperature measuring means. The heat exchange unit according to any one of claims 1 to 3, wherein the flow rate of the liquid is controlled. The heat exchange unit according to any one of claims 1 to 4, wherein the heat exchanger is replaceable by flange connection. A pressure measuring means for measuring the pressure of the groundwater flowing in or out of the heat exchanger, and
Based on the pressure of the groundwater measured by the pressure measuring means, the first clogging determining means for determining whether or not the heat exchanger is clogged, and the first clogging determining means.
The invention according to any one of claims 1 to 5, further comprising a first notifying means for notifying when the heat exchanger is determined to be clogged by the first clogging determining means. Heat exchange unit. An average temperature difference is calculated for the heat exchanger based on the temperature at which the ground water flows in, the temperature at which the ground water flows out, the temperature at which the liquid flows in, and the temperature at which the liquid flows out, and the average temperature difference is calculated. A second clogging determination means for determining whether or not the heat exchanger is clogged based on
Any of claims 1 to 6, further comprising a second notifying means for notifying the heat exchanger when it is determined by the second clogging determining means that the heat exchanger is clogged. The heat exchange unit described. Inside the case portion, the groundwater flow path and the liquid flow path are provided.
The heat exchange unit according to any one of claims 1 to 7, wherein the case portion is provided with a heat insulating material. The heat exchange unit according to any one of claims 1 to 8, further comprising an air bleeding valve with a check valve provided in the groundwater flow path. By providing an intake port connected to the groundwater flow path and attaching a faucet to the intake port, it is possible to supply power to the heat exchange unit with a generator and use the groundwater as disaster water in the event of a disaster. The heat exchange unit according to any one of claims 1 to 9. A groundwater utilization system equipped with a heat exchange unit and a heat pump.
The heat exchange unit is
Case part and
A heat exchanger that exchanges heat between groundwater and liquid,
A first control means that controls a first pump that pumps the groundwater from a well and supplies the groundwater to the heat exchanger.
A second control means for controlling the second pump for flowing the liquid and supplying the liquid to the heat exchanger is provided.
The heat exchanger is provided inside the case portion and is provided.
The first control means and the second control means are provided on the outer surface of the case portion or inside the case portion.
The heat pump is a groundwater utilization system characterized in that heat exchange is performed between the liquid and the fluid whose heat is exchanged by the heat exchanger.

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