Control device, geothermal heat use system, control method and program

Abstract

To provide a control device which can easily maintain a balance of a heat storage amount of an aquifer, a geothermal heat use system, a control method and a program.SOLUTION: A control device comprises: an operation control part which can switch a first cold heat storage mode for supplying hot heat stored in a hot water well to a cooling tower not via a heat source machine, and storing cold heat acquired from the cooling tower in a cold water well not via the heat source machine, a second cold heat storage mode for supplying the hot heat stored in the hot water well to the cooling tower via the heat source machine, and storing the cold heat acquired from the cooling tower in the cold water well via the heat source machine, a first cold heat radiation mode for supplying the cold heat stored in the cold water well to an apparatus not via the heat source machine, and a second cold heat radiation mode for supplying the cold heat stored in the cold water well to the apparatus via the heat source machine; a calculation part for calculating an integrated cold storage amount; a prediction part for predicting a necessary cold storage amount; and a mode determination part for determining whether or not to perform control at the first cold heat storage mode, or to perform the control at the second cold heat storage mode on the basis of the integrated cold storage amount and the necessary cold storage amount.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a control device, a geothermal heat utilization system, a control method, and a program. [Background technology]

[0002] 2. Description of the Related Art In recent years, geothermal energy utilization systems that utilize groundwater as a hot or cold heat source have been proposed.

[0003] For example, Patent Document 1 discloses a geothermal energy utilization system including a heat source well facility having a hot water well, a cold water well, a well-side pipe, and a pump provided on the well-side pipe, a heat source machine having a refrigeration cycle, a primary refrigerant circuit capable of heat exchange between the heat source machine and the well-side pipe, and a secondary refrigerant circuit capable of heat exchange between the heat source machine and a load. In this system, the heat source machine includes a condenser and an evaporator. In this geothermal energy utilization system, the mode can be switched between a cold heat storage operation mode and a cold heat dissipation operation mode depending on the season. In the cold heat storage operation mode, heat is exchanged between the evaporator of the heat source machine and the well-side pipe, and heat is exchanged between the condenser of the heat source machine and the load. In the cold heat dissipation operation mode, heat is exchanged between the condenser of the heat source machine and the well-side pipe, and heat is exchanged between the evaporator of the heat source machine and the load. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6857883 Summary of the Invention [Problem to be solved by the invention]

[0005] The geothermal energy utilization system described in Patent Document 1 attempts to maintain a balance in the amount of stored heat by implementing a cold heat storage operation mode during summer nights, winter, etc., in preparation for discharging cold heat in the cold heat discharge operation mode. However, when operating in the cold heat discharge operation mode, the cold heat stored in the cold heat storage operation mode may be insufficient or surplus to the amount of heat required during peak periods. This poses a problem in that it is difficult to balance the amount of stored heat in the aquifer.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a control device, a geothermal heat utilization system, a control method, and a program that can easily balance the heat storage amount in an aquifer. [Means for solving the problem]

[0007] In order to solve the above problems, a control device according to the present disclosure is a control device for controlling a geothermal heat utilization system including a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source unit, and the geothermal heat utilization system is configured to operate in a first cold heat storage mode in which hot heat stored in the hot water well is supplied to the cooling tower without passing through the heat source unit, and cold heat obtained from the cooling tower is stored in the cold water well without passing through the heat source unit, an operation control unit that switches between a second cold heat storage mode in which the cold heat obtained from the cooling tower is supplied to the cooling tower via a heat source machine and stored in the cold water well via the heat source machine, a first cold heat release mode in which the cold heat stored in the cold water well is supplied to equipment without going through the heat source machine, and a second cold heat release mode in which the cold heat stored in the cold water well is supplied to the equipment via the heat source machine; and a calculation unit that calculates an accumulated cold heat storage amount, which is the amount of cold heat stored in the cold water well. The system is equipped with a prediction unit that predicts a required cold storage amount, which is the amount of cold storage required to cool the equipment, and a mode determination unit that determines whether control should be performed in the first cold storage mode or the second cold storage mode based on the accumulated cold storage amount and the required cold storage amount.

[0008] The geothermal energy utilization system according to the present disclosure includes the control device described above, the heat source well facility, and the heat storage auxiliary facility.

[0009] The control method according to the present disclosure is a method for controlling a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source unit, and includes a first cold heat storage mode in which hot heat stored in the hot water well is supplied to the cooling tower without passing through the heat source unit, and cold heat obtained from the cooling tower is stored in the cold water well without passing through the heat source unit, a second cold heat storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower via the heat source unit, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source unit, and The method includes a step of calculating an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well of a geothermal energy utilization system that can switch between a first cold storage mode in which the cold storage is supplied to the equipment without going through the heat source unit, and a second cold storage mode in which the cold storage stored in the cold water well is supplied to the equipment via the heat source unit; a step of predicting a required cold storage amount, which is the amount of cold storage required to cool the equipment; and a step of determining whether to control in the first cold storage mode or the second cold storage mode based on the accumulated cold storage amount and the required cold storage amount.

[0010] The program according to the present disclosure includes a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source machine, and includes a first cold heat storage mode in which hot heat stored in the hot water well is supplied to the cooling tower without passing through the heat source machine, and cold heat obtained from the cooling tower is stored in the cold water well without passing through the heat source machine, a second cold heat storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower via the heat source machine, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source machine, and a third cold heat storage mode in which the cold heat stored in the cold water well is supplied to the cooling tower via the heat source machine, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source machine. The computer of the geothermal energy utilization system, which can switch between a first cold-water discharge mode in which the cold energy stored in the cold water well is supplied to the equipment via the heat source unit, executes processing including the steps of: calculating an accumulated cold-water storage amount, which is the amount of cold energy stored in the cold water well; predicting a required cold-water storage amount, which is the amount of cold energy required to cool the equipment; and determining whether to control in the first cold-water storage mode or the second cold-water storage mode based on the accumulated cold-water storage amount and the required cold-water storage amount. Effect of the Invention

[0011] According to the control device, geothermal heat utilization system, control method, and program disclosed herein, it is possible to easily balance the amount of heat stored in an aquifer. [Brief description of the drawings]

[0012] [Figure 1] 1 is a system diagram showing a schematic configuration of a geothermal heat utilization system according to an embodiment of the present disclosure. [Diagram 2] 1 is a diagram showing the flow of groundwater and a medium when operating in a first cold heat storage mode in a geothermal energy utilization system according to an embodiment of the present disclosure. FIG. [Diagram 3] 1 is a diagram showing the flow of groundwater and a medium when operating in a second cold heat storage mode in a geothermal energy utilization system according to an embodiment of the present disclosure. FIG. [Figure 4] 1 is a diagram showing the flow of groundwater and medium when operating in a first cold heat release mode in a geothermal energy utilization system according to an embodiment of the present disclosure. FIG. [Diagram 5] 1 is a diagram showing the flow of groundwater and medium when operating in a first cold heat release mode in a geothermal energy utilization system according to an embodiment of the present disclosure. FIG. [Figure 6] FIG. 2 is a block diagram showing a functional configuration of a control device according to an embodiment of the present disclosure. [Figure 7] 4 is a flowchart showing the flow of a control method according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a diagram illustrating an example of a hardware configuration of a computer included in each of a calculation device and a control device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of a geothermal utilization system according to the present disclosure will be described with reference to FIGS. 1 to 8. FIG. (Configuration of geothermal energy utilization system) As shown in FIG. 1, the geothermal energy utilization system 1 mainly includes a heat source well facility 10, a heat storage auxiliary facility 100, a heat exchanger 4, and a control device 300 (see FIG. 6).

[0014] (Configuration of heat source well equipment) As shown in FIG. 1, the heat source well facility 10 mainly comprises a hot water well 21, a cold water well 22, well-side piping 3, and a pump 31.

[0015] A hot water well 21 and a cold water well 22 each extend from the ground into the aquifer. The hot water well 21 and the cold water well 22 are configured so as to take in groundwater from the aquifer and return groundwater from the inside of the hot water well 21 and the cold water well 22 to the aquifer, respectively.

[0016] The heat source well facility 10 pumps up groundwater from one of the hot water well 21 and the cold water well 22, exchanges heat in the heat exchanger 4, and then injects the groundwater after heat exchange into the other of the hot water well 21 and the cold water well 22. In other words, the heat source well facility 10 may pump up groundwater from the hot water well 21 and inject it into the cold water well 22, or may pump up groundwater from the cold water well 22 and inject it into the hot water well 21.

[0017] The well side piping 3 connects the hot water well 21 and the cold water well 22 . Both ends of the well side piping 3 extend into the hot water well 21 and the cold water well 22. For example, the well-side piping 3 may be immersed at both ends in the groundwater of the hot water well 21 and the cold water well 22 so as to connect the hot water well 21 and the cold water well 22.

[0018] A pump 31 is provided on the well side piping 3. A pump 31 is provided at each end of the well-side piping 3. The pump 31 pumps water from the hot water well 21 and the cold water well 22 to the well side piping 3. For example, the pumps 31 may be provided at both ends of the well-side piping 3 and immersed in the groundwater in the hot water well 21 and the cold water well 22. For example, the output of the pump 31 may be changed by inverter control.

[0019] The heat exchanger 4 exchanges heat between the groundwater in the well-side piping 3 and a medium in a refrigerant circuit 101 (to be described later) on the thermal storage auxiliary equipment 100 side. In this embodiment, the heat exchanger 4 includes a first heat exchanger 41 and a second heat exchanger . The first heat exchanger 41 and the second heat exchanger 42 are arranged in series with respect to the well side piping 3. The first heat exchanger 41 and the second heat exchanger 42 are individually connected to the well side piping 3. One side of the first heat exchanger 41 and one side of the second heat exchanger 42 are each connected midway through the well-side piping 3. The other side of the first heat exchanger 41 and the other side of the second heat exchanger 42 are each connected to a refrigerant circuit 101, which will be described later. The first heat exchanger 41 and the second heat exchanger 42 are configured such that by opening and closing an on-off valve (not shown) provided between the first heat exchanger 41 and the second heat exchanger 42 and the well side piping 3, groundwater in the well side piping 3 flows into either the first heat exchanger 41 or the second heat exchanger 42, and heat exchange takes place.

[0020] Each of the first heat exchanger 41 and the second heat exchanger 42 exchanges heat between groundwater pumped up from the hot water well 21 and flowing in the well-side piping 3 and the medium on the thermal storage auxiliary equipment 100 side. The groundwater after the heat exchange flows from each of the first heat exchanger 41 and the second heat exchanger 42 through the well-side piping 3 and is injected into the cold water well 22. The first heat exchanger 41 and the second heat exchanger 42 each exchange heat between groundwater pumped up from the cold water well 22 and flowing in the well-side piping 3 and the medium on the thermal storage auxiliary equipment 100 side. The groundwater after the heat exchange flows from the first heat exchanger 41 and the second heat exchanger 42 through the well-side piping 3 and is injected into the hot water well 21. For example, the first heat exchanger 41 and the second heat exchanger 42 may be provided midway along the well-side piping 3 on the ground.

[0021] When hot water is sent from the hot water well 21 as groundwater to each of the first heat exchanger 41 and the second heat exchanger 42, each of the first heat exchanger 41 and the second heat exchanger 42 cools the hot water to cold water by heat exchange with the medium on the thermal storage auxiliary equipment 100 side. This cold water is sent to the cold water well 22. In this case, the hot water well 21 releases hot heat, and the cold water well 22 stores cold heat. When cold water is sent as groundwater from the cold water well 22 to each of the first heat exchanger 41 and the second heat exchanger 42, the cold water is heated to hot water in each of the first heat exchanger 41 and the second heat exchanger 42 by heat exchange with the medium on the thermal storage auxiliary equipment 100 side. This hot water is sent to the hot water well 21. In this case, the cold water well 22 performs cold heat dissipation, that is, cold heat dissipation, and the hot water well 21 performs hot heat storage, that is, hot heat storage. Here, "hot water" refers to water whose temperature is higher than the initial underground temperature of the groundwater in the aquifer or water whose temperature is similar to the initial underground temperature of the groundwater in the aquifer, and "cold water" refers to water whose temperature is lower than the initial underground temperature of the groundwater in the aquifer. For example, the initial subsurface temperature of the groundwater in an aquifer is 18°C.

[0022] (Configuration of heat storage auxiliary equipment) The thermal storage auxiliary equipment 100 utilizes a medium that has exchanged heat with the groundwater in the well-side piping 3 in the first heat exchanger 41 and the second heat exchanger 42 . In this embodiment, the thermal storage auxiliary equipment 100 includes, for example, a heat source unit 110, a cooling tower 130, and a refrigerant circuit 101.

[0023] For example, the heat source unit 110 may be a heat pump equipped with a condenser, an evaporator, a compressor, and the like. The heat source unit 110 supplies a medium (chilled water) to the device 120 . The equipment 120 is, for example, an air conditioner that performs heat exchange with a medium (chilled water) supplied from the heat source unit 110 to condition the space in which the equipment 120 is installed. In this embodiment, the device 120 conditions the air in a space that houses a plurality of computers (servers) and the like, for example, in a data center or the like. The use of the space conditioned by the equipment 120 is not limited to a data center, and may be for other purposes. Therefore, a system including the geothermal heat utilization system 1 and the equipment 120 functions as an air conditioning system.

[0024] The cooling tower 130 cools the cooling water by the heat of vaporization generated when the cooling water comes into contact with the air and is vaporized. The cooling tower 130 circulates cooling water between the heat source unit 110 and the second heat exchanger 42. In one mode, the cooling tower 130 can select either the heat source unit 110 or the second heat exchanger 42 to circulate cooling water. In another mode, the cooling tower 130 can circulate cooling water between both the heat source unit 110 and the second heat exchanger 42. That is, a unit including the heat source unit 110 and the cooling tower 130 functions as a refrigerator.

[0025] The refrigerant circuit 101 forms a flow path of the medium between the first heat exchanger 41, the second heat exchanger 42, the heat source unit 110, and the device 120. The refrigerant circuit 101 has an equipment side circuit section 102 that connects the heat source unit 110 and the equipment 120, and a cooling tower side circuit section 103 that connects the heat source unit 110 and the cooling tower 130. The medium flowing through the device side circuit section 102 and the medium flowing through the cooling tower side circuit section 103 exchange heat in the heat source unit 110.

[0026] The device side circuit section 102 has a feed line 102 a that feeds the medium from the heat source device 110 to the device 120 , and a return line 102 b that returns the medium from the device 120 to the heat source device 110 . The cooling tower side circuit section 103 has a feed line 103a that feeds the medium from the cooling tower 130 to the heat source unit 110, and a return line 103b that returns the medium from the heat source unit 110 to the cooling tower 130.

[0027] The refrigerant circuit 101 further has a first heat exchanger side circuit 104 connecting the equipment side circuit section 102 and the other side of the first heat exchanger 41, and a second heat exchanger side circuit 105 connecting the cooling tower side circuit section 103 and the other side of the second heat exchanger 42. The first heat exchanger side circuit 104 has a cold water line 104a through which cold water flows, and a hot water line 104b through which hot water flows. The second heat exchanger side circuit 105 has a cold water line 105a through which cold water flows, and a hot water line 105b through which hot water flows.

[0028] The refrigerant circuit 101 is appropriately provided with pumps, on-off valves, etc. (not shown), and is configured to be able to circulate the medium via a predetermined route between the first heat exchanger 41, the heat source unit 110, and the equipment 120, and between the second heat exchanger 42, the heat source unit 110, and the cooling tower 130, depending on the operating mode. For example, the heat storage auxiliary equipment 100 is configured to be able to switch operating modes among a first cold heat storage mode M1, a second cold heat storage mode M2, a first cold heat release mode M3, and a second cold heat release mode M4 by switching the medium circulation route in the refrigerant circuit 101, as shown below.

[0029] (Configuration of the first cold storage mode) As shown in Figure 2, in the first cold water storage mode M1, the geothermal energy utilization system 1 supplies the hot water stored in the hot water well 21 to the cooling tower 130 without passing through the heat source unit 110, and stores the cold water obtained from the cooling tower 130 in the cold water well 22 without passing through the heat source unit 110. In Figure 2, among the media flowing through the well side piping 3, the equipment side circuit section 102, the cooling tower side circuit section 103, and the second heat exchanger side circuit 105, warm media are indicated by dotted lines and cold media are indicated by thick lines.

[0030] Specifically, in the first cold-heat-storage mode M1, the geothermal heat utilization system 1 pumps up hot water using the pump 31 in the hot water well 21 and sends it to the second heat exchanger . On the other hand, in the cooling tower side circuit section 103 on the thermal storage auxiliary equipment 100 side, the geothermal heat utilization system 1 exchanges heat between the medium (cold water) cooled in the cooling tower 130 and the medium flowing through the equipment side circuit section 102 in the heat source unit 110. As a result, the equipment side circuit section 102 cools the medium circulating between the equipment 120 and the heat source unit 110 and sends it to the equipment 120. In the heat source unit 110, the medium (hot water) whose temperature has increased by heat exchange with the medium flowing through the equipment side circuit section 102 is returned to the cooling tower 130.

[0031] In addition, a portion of the medium (cold water) cooled in the cooling tower 130 is sent to the second heat exchanger 42 via the second heat exchanger side circuit 105, and exchanges heat with the hot water on the heat source well equipment 10 side sent from the hot water well 21. As a result, the hot water on the heat source well equipment 10 side is cooled and sent to the cold water well 22 through the well side piping 3. As a result, cold heat is stored in the cold water well 22. The medium whose temperature has increased due to heat exchange with the hot water on the heat source well equipment 10 side returns to the cooling tower 130.

[0032] Such a first cold-storage mode M1 is particularly effective when the outside air temperature is low, such as at night or in winter, and the cooling tower 130 alone can provide a sufficient cooling effect for the medium. In the first cold-heat-storage mode M1, the heat source unit 110 is not used for cooling the hot water on the heat-source well facility 10 side, so that power consumption in the heat source unit 110 is reduced.

[0033] (Configuration of the second cold storage mode) As shown in Figure 3, in the second cold water storage mode M2, the geothermal energy utilization system 1 supplies the hot water stored in the hot water well 21 to the cooling tower 130 via the heat source unit 110, and stores the cold water obtained from the cooling tower 130 in the cold water well 22 via the heat source unit 110. In Figure 3, among the media flowing through the well side piping 3, the equipment side circuit section 102, the cooling tower side circuit section 103, and the first heat exchanger side circuit 104, warm media are indicated by dotted lines and cold media are indicated by thick lines.

[0034] Specifically, in the second cold-heat-storage mode M2, the geothermal heat utilization system 1 pumps up hot water using the pump 31 in the hot water well 21 and sends it to the first heat exchanger 41. On the other hand, in the cooling tower side circuit section 103 on the heat storage auxiliary equipment 100 side, the geothermal heat utilization system 1 exchanges heat between the medium (cold water) cooled in the cooling tower 130 and the medium flowing through the equipment side circuit section 102 in the heat source unit 110. For example, if cooling of the equipment 120 is also required, the equipment-side circuit unit 102 may cool the medium circulating between the equipment 120 and the heat source unit 110 and send it to the equipment 120. In the heat source unit 110, the medium (hot water) whose temperature has been increased by heat exchange with the medium flowing through the equipment-side circuit unit 102 is returned to the cooling tower 130.

[0035] In addition, all or a part of the medium (cold water) cooled by the heat source unit 110 is sent from the equipment side circuit section 102 to the first heat exchanger 41 via the first heat exchanger side circuit 104, and exchanges heat with the hot water on the heat source well equipment 10 side. As a result, the hot water on the heat source well equipment 10 side is cooled and sent to the cold water well 22 through the well side piping 3. As a result, cold heat is stored in the cold water well 22. The medium whose temperature has increased due to heat exchange with the hot water on the heat source well equipment 10 side returns to the heat source unit 110 via the first heat exchanger side circuit 104.

[0036] The performance of the heat source unit 110 is improved when there is a small temperature difference between the medium on the device side circuit unit 102 side and the cooling tower side circuit unit 103 side. For this reason, the second cold heat storage mode M2 ​​is effective when the outside air temperature is low, such as at night or in winter, and there is a small temperature difference between the medium on the device side circuit unit 102 side and the cooling tower side circuit unit 103 side in the heat source unit 110. In the second cold-heat-storage mode M2, the heat source unit 110 is effectively utilized when its performance is improved, so that cold-heat can be efficiently stored.

[0037] (Configuration of the first cold and heat dissipation mode) As shown in FIG. 4, in the first cold-discharge mode M3, the geothermal heat utilization system 1 supplies the cold stored in the cold water well 22 to the equipment 120 without passing through the heat source equipment 110. In Figure 4, among the media flowing through the well side piping 3, the equipment side circuit section 102, and the first heat exchanger side circuit 104, warm media are indicated by dotted lines and cold media are indicated by thick lines.

[0038] Specifically, in the first cold heat release mode M3, the geothermal heat utilization system 1 pumps up cold water using the pump 31 in the cold water well 22 and sends it to the first heat exchanger 41. In the first heat exchanger 41, the geothermal heat utilization system 1 exchanges heat between the cold water on the heat source well facility 10 side and the medium flowing through the equipment side circuit unit 102. As a result, the equipment side circuit unit 102 cools the medium circulating between the equipment 120 and the first heat exchanger 41 and sends the cooled medium to the equipment 120.

[0039] On the other hand, the cold water on the heat source well equipment 10 side is heated to hot water by the heat exchange in the first heat exchanger 41, and is sent to the hot water well 21 through the well side piping 3. As a result, the cold water well 22 releases cold heat.

[0040] In this way, in the first cold-heat-discharging mode M3, cold water stored in the cold water well 22 can be used to directly supply cold heat to the equipment 120 without using the heat source unit 110.

[0041] (Configuration of the second cold and heat dissipation mode) As shown in FIG. 5, in the second cold-discharge mode M4, the geothermal heat utilization system 1 supplies the cold stored in the cold water well 22 to the equipment 120 via the heat source unit 110. In Figure 5, among the media flowing through the well side piping 3, the equipment side circuit section 102, the cooling tower side circuit section 103, and the second heat exchanger side circuit 105, warm media are indicated by dotted lines and cold media are indicated by thick lines.

[0042] Specifically, in the second cold heat release mode M4, the geothermal heat utilization system 1 pumps up cold water using the pump 31 in the cold water well 22 and sends it to the second heat exchanger . In the second heat exchanger 42, the geothermal heat utilization system 1 exchanges heat between the cold water on the heat source well facility 10 side and the medium flowing through the cooling tower side circuit section 103. As a result, the cooling tower side circuit section 103 cools the medium circulating between the heat source unit 110 and the second heat exchanger 42 and sends it to the heat source unit 110. In the heat source unit 110, the geothermal heat utilization system 1 exchanges heat between the cooled medium on the cooling tower side circuit unit 103 side and the medium flowing through the equipment side circuit unit 102. As a result, the equipment side circuit unit 102 cools the medium circulating between the equipment 120 and the heat source unit 110 and sends it to the equipment 120.

[0043] On the other hand, the cold water on the heat source well equipment 10 side is heated to hot water by the heat exchange in the second heat exchanger 42, and is sent to the hot water well 21 through the well side piping 3. As a result, the cold water well 22 releases cold heat.

[0044] In this way, in the second cold-heat release mode M4, the cold water stored in the cold-water well 22 is cooled using the heat source device 110, and cold heat is supplied to the equipment 120. As a result, when the amount of cold heat required by the equipment 120 is greater than the amount of cold heat stored in the cold-water well 22, the heat source device 110 can be used to ensure the amount of cold heat to be supplied to the equipment 120.

[0045] (Control device configuration) The control device 300 controls the operation of the geothermal energy utilization system 1. The control device 300 controls the operation of each part of the geothermal heat utilization system 1 in each of the first cold heat storage mode M1, the second cold heat storage mode M2, the first cold heat release mode M3, and the second cold heat release mode M4.

[0046] As shown in FIG. 6, the control device 300 includes an operation control unit 310, a calculation unit 320, a prediction unit 330, an outside air temperature acquisition unit 340, a cold water temperature acquisition unit 350, and a mode determination unit 360.

[0047] The operation control unit 310 enables switching of the operation mode among the first cold heat storage mode M1, the second cold heat storage mode M2, the first cold heat release mode M3, and the second cold heat release mode M4. The operation control unit 310 controls the operation of each part of the geothermal heat utilization system 1 according to the switched operation mode among the first cold heat storage mode M1, the second cold heat storage mode M2, the first cold heat release mode M3, and the second cold heat release mode M4.

[0048] The operation control unit 310 may be configured to suppress the amount of cold storage to the cold water well 22 when at least one of the first cold storage mode M1 and the second cold storage mode M2 ​​is being executed and the accumulated amount of cold storage is greater than the required amount of cold storage predicted by the prediction unit 330, as described below. The operation control unit 310 may store cold energy in the cold water well 22 in response to the difference between the required cold energy storage amount predicted by the prediction unit 330 (described below) and the predicted value of the amount of electricity to be peak-cut (described below) predicted by the prediction unit 330 when at least one of the first cold energy storage mode M1 and the second cold energy storage mode M2 ​​is being executed. The operation control unit 310 may be configured to reduce the amount of cold stored in the cold water well 22 when the accumulated amount of cold stored is greater than the predicted amount of electricity to be peak-cut when at least one of the first cold storage mode M1 and the second cold storage mode M2 ​​is being executed.

[0049] The operation control unit 310 may be configured to constantly supply cold heat to the device 120 when at least one of the first cold heat release mode M3 and the second cold heat release mode M4 is being executed. In other words, the operation control unit 310 may be configured to constantly perform cooling operation to supply cold heat to the device 120 throughout the day and night throughout the year, without performing heating operation to supply hot heat to the device 120.

[0050] The calculation unit 320 calculates an accumulated amount of cold storage, which is the amount of cold storage stored in the cold water well 22. Here, the "accumulated amount of cold storage" is a value obtained by subtracting the accumulated amount of heat released from the cold water well 22 by pumping water from the cold water well 22, from the accumulated amount of heat stored in the cold water well 22 by injecting water into the cold water well 22 from a state in which the groundwater of the aquifer in the cold water well 22 is at the initial underground temperature until the time of calculation.

[0051] The prediction unit 330 predicts a required cold storage amount, which is a cold storage amount required to cool the device 120. Here, the "required cold storage amount" is a cold storage amount required in a predetermined period in the near future. The "predetermined period in the near future" is, for example, the daytime of the next day or the next nearest summer period. The prediction unit 330 further predicts the amount of power that is equal to or greater than a preset threshold as a predicted value of the amount of power that should be peak-cut. The prediction unit 330 may, for example, accumulate information such as the past amount of cold energy usage, the time of usage, the temperature, the amount of heat generated by computers or the like arranged in the space to be air-conditioned by the device 120, the number of computers, etc., and based on the accumulated information, the predicted time, temperature, and the usage plan of the computers or the like, predict the required amount of cold storage and the predicted value of the amount of electricity to be peak-cut. The prediction unit 330 may use artificial intelligence or the like to predict the required amount of cold storage and the predicted value of the amount of power to be peak-cut, and may perform deep learning of the accumulated information.

[0052] The outside air temperature acquisition unit 340 acquires the outside air temperature. The outside air temperature acquisition unit 340 may acquire, as the outside air temperature, an actual measurement value of the outside air temperature at the location where the geothermal energy utilization system 1 is installed using a thermometer or the like, for example. The outside air temperature acquisition unit 340 may acquire, for example, a numerical value of the outside air temperature input by an operator. The outside air temperature acquisition unit 340 may acquire data on the outside air temperature via an external network.

[0053] The cold water temperature acquisition unit 350 acquires the pumped water temperature of the cold water well 22 . The cold water temperature acquisition unit 350 may acquire the pumped water temperature of the cold water well 22 detected by a cold water temperature sensor (not shown) installed in the cold water well 22.

[0054] The mode determination unit 360 determines to which mode the operation control unit 310 should switch to among the first cold heat storage mode M1, the second cold heat storage mode M2, the first cold heat release mode M3, and the second cold heat release mode M4. The mode determination unit 360 selects the mode based on at least one of the accumulated amount of cold storage and the required amount of cold storage. When storing cold energy in the cold water well 22, the mode determination unit 360 determines whether to control in the first cold energy storage mode M1 or the second cold energy storage mode M2 ​​based on the accumulated cold energy storage amount and the required cold energy storage amount. When storing cold energy in the cold water well 22, the mode determination unit 360 may determine whether control should be performed in the first cold energy storage mode M1 or the second cold energy storage mode M2 ​​based on the outside air temperature. When storing cold energy in the cold water well 22, the mode determination unit 360 may determine whether to implement the first cold energy storage mode M1 or the second cold energy storage mode M2 ​​based on the accumulated cold energy storage amount and the pumped water temperature of the cold water well 22. When the cold energy stored in the cold water well 22 is supplied to the equipment 120, the mode determination unit 360 may determine whether to control it in the first cold energy release mode M3 or the second cold energy release mode M4 based on the pumping temperature of the cold water well 22.

[0055] The operation of the control device 300 of this embodiment will be described. The operation of the control device 300 corresponds to an embodiment of a control method. The control device 300 performs the steps shown in FIG.

[0056] First, the control device 300 checks whether the cooling operation is ON in the device 120 (step S11). If the cooling operation is ON in step S11 (step S11: Yes), the process proceeds to step S12 and subsequent steps. If the cooling operation is OFF in step S11 (step S11: No), the process proceeds to step S21 and subsequent steps described below.

[0057] In step S12, the control device 300 checks whether or not it is necessary to suppress the demand (demand cut). Here, "demand" refers to the amount of power required for the air conditioning facility including the geothermal heat utilization system 1 and the device 120. For example, in step S12, the control device 300 checks whether or not it is necessary to suppress the demand by using the heat stored in the heat source well facility 10 so that the demand does not exceed a predetermined upper limit for reducing the basic electricity charge. In step S12, if a demand cut is necessary (step S12: Yes), a target value for the demand cut (demand target value) is set (step S13). Next, the control device 300 calculates the amount of heat dissipation from the cold water well 22 (step S14).

[0058] Next, the cold water temperature acquisition unit 350 acquires the pumped water temperature at that time from the cold water well 22. The control device 300 checks whether the acquired pumped water temperature is higher than a preset reference temperature (step S15). As a result, if the pumped water temperature is equal to or lower than the reference temperature (step S15: No), the mode determination unit 360 selects the first cold radiation mode M3 (see FIG. 4) as the operation mode (step S16). The operation control unit 310 controls the operation of each unit of the geothermal heat utilization system 1 so that the geothermal heat utilization system 1 operates in the first cold radiation mode M3 selected by the mode determination unit 360. On the other hand, if the pumped water temperature is higher than the reference temperature (step S15: Yes), the mode determination unit 360 selects the second cold radiation mode M4 (see FIG. 5) as the operation mode (step S17). In this case, the operation control unit 310 controls the operation of each unit of the geothermal heat utilization system 1 so that the geothermal heat utilization system 1 operates in the second cold radiation mode M4 selected by the mode determination unit 360. Furthermore, if demand cut is not required in step S12 (step S12: No), the mode determination unit 360 also selects the second cold-heat release mode M4 (see FIG. 5) as the operation mode (step S17).

[0059] If the cooling operation is OFF on the device 120 side in step S11 (step S11: No), in step S21, the calculation unit 320 first calculates the accumulated cold storage amount, which is the amount of cold storage stored in the cold water well 22. Also in step S21, the outdoor air temperature acquisition unit 340 acquires the outdoor air temperature at that time. Furthermore, in step S21, the cold water temperature acquisition unit 350 acquires the pumped water temperature of the cold water well 22.

[0060] Next, in step S22, the mode determination unit 360 checks whether the accumulated cold storage amount calculated in step S21 is less than a preset target value. Also, in step S22, the mode determination unit 360 checks whether the pumped water temperature of the cold water well 22 acquired in step S21 is higher than a preset target temperature. In step S22, if the conditions that the accumulated cold storage amount is less than the target value and the pumped water temperature is higher than the target temperature are satisfied (step S22: Yes), the mode determination unit 360 proceeds to step S23. In step S22, if the conditions that the accumulated cold storage amount is less than the target value and the pumped water temperature is higher than the target temperature are not satisfied (step S22: No), the mode determination unit 360 ends the process of selecting the operation mode.

[0061] In step S23, the prediction unit 330 predicts a required amount of cold energy storage, which is an amount of cold energy storage required to cool the device 120. Next, in step S24, the mode determination unit 360 determines whether to select the first cold-heat-storage mode M1 or the second cold-heat-storage mode M2 ​​based on the outside air temperature acquired in step S21. In step S24, the mode determination unit 360 may perform a simulation based on the outside air temperature, for example, using a method described in Japanese Patent No. 7136965, and select either the first cold storage mode M1 or the second cold storage mode M2 ​​based on the results of the simulation.

[0062] Next, in step S25, the operation control unit 310 sets detailed operating conditions for the first cold-heat-storage mode M1 or the second cold-heat-storage mode M2 ​​selected in step S24. To achieve this, the operation control unit 310 sets the amount of cold energy stored in the cold water well 22, the heat storage temperature, flow rate, time, etc. in the selected first cold energy storage mode M1 or second cold energy storage mode M2 ​​based on past operating data of the geothermal energy utilization system 1 or a table input by the user. Next, in step S26, the operation control unit 310 controls the operation of each part of the geothermal energy utilization system 1 so that the geothermal energy utilization system 1 operates under the operating conditions set in step S25 in the first cold storage mode M1 or the second cold storage mode M2 ​​selected in step S24.

[0063] (Action and Effects) According to this embodiment, the control device 300, the geothermal energy utilization system 1, and the control method determine whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount, thereby storing the predicted cold required for cooling the equipment in the cold water well. For this reason, it is unlikely that there will be a shortage or surplus of cold energy stored in the aquifer throughout the entire period. Therefore, the control device 300, the geothermal heat utilization system 1, and the control method can easily balance the amount of heat stored in the aquifer.

[0064] In addition, according to one example of this embodiment, by determining whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the outside air temperature, an appropriate cold storage mode according to the outside air temperature can be selected to store cold energy in the cold water well 22.

[0065] Furthermore, according to one example of this embodiment, when the pumping temperature of the cold water well 22 is equal to or higher than a predetermined target temperature, cold energy can be stored in the cold water well 22 in an appropriate cold energy storage mode selected based on the accumulated cold energy storage amount and the pumping temperature of the cold water well 22.

[0066] Furthermore, according to one example of this embodiment, by determining whether to control in the first cold-water discharge mode M3 or the second cold-water discharge mode M4 based on the pumping temperature of the cold water well 22, an appropriate cold-water discharge mode according to the pumping temperature of the cold water well 22 can be selected, and the cold stored in the cold water well 22 can be supplied to the equipment 120.

[0067] Furthermore, according to one example of this embodiment, when the first cold storage mode M1 or the second cold storage mode M2 ​​is executed, if the accumulated amount of cold storage is greater than the required amount of cold storage, the amount of cold storage in the cold water well 22 can be suppressed, thereby suppressing the amount of electricity required to store heat in the cold water well 22, which is also the amount of electricity required for the operation of the cooling tower 130, the heat source unit 110, various pumps, etc.

[0068] According to one example of this embodiment, when at least one of the first cold-heat dissipation mode M3 and the second cold-heat dissipation mode M4 is being executed, cold heat can be constantly supplied to the device 120. This allows cooling of a space housing a heat source such as a computer that is constantly running throughout the day and night throughout the year.

[0069] <Modification> In the above-described embodiment, the heat exchanger 4 comprises a first heat exchanger 41 and a second heat exchanger 42, but may be configured in any manner as long as heat exchange is possible between the groundwater in the well side piping 3 and the medium in the refrigerant circuit 101 on the heat storage auxiliary equipment 100 side. As a modified example, the heat exchanger 4 may be configured as one system by modifying each piping. As such a specific example, the heat exchanger 4 may include only the first heat exchanger 41 out of the first heat exchanger 41 and the second heat exchanger 42. In this case, one side of the first heat exchanger 41 may be connected to the middle of the well-side piping 3, and the other side of the first heat exchanger 41 may be connected to the first heat exchanger-side circuit 104 and the cooling tower-side circuit section 103. In addition, the first heat exchanger-side circuit 104 and the cooling tower-side circuit section 103 may be connected in parallel to the first heat exchanger 41, respectively, via an on-off valve or the like.

[0070] In the above-described embodiment, in the second cold / heat storage mode M2, the equipment side circuit section 102 cools the medium circulating between the equipment 120 and the heat source unit 110 and sends it to the equipment 120, but the configuration may be any as long as cold / heat storage is performed in the cold water well 22. As a modified example, in the second cold-heat-storage mode M2, the device-side circuit unit 102 does not need to send the medium cooled by the heat source unit 110 to the device 120. In this case, the medium cooled by the heat source unit 110 is sent from the device-side circuit unit 102 to the first heat exchanger 41 via the first heat exchanger-side circuit 104.

[0071] In the above-described embodiment, the mode determination unit 360 determines whether to control in the first cold storage heat storage mode M1 or the second cold storage heat storage mode M2 ​​based on the outside air temperature, but the mode determination unit 360 may be configured in any manner as long as it can determine whether to control in the first cold storage heat storage mode M1 or the second cold storage heat storage mode M2. As a modified example, the mode determination unit 360 may determine whether to control in the first cold-storage mode M1 or the second cold-storage mode M2 ​​based on the outside air wet-bulb temperature.

[0072] In the above embodiment, a program for implementing various functions of the control device 300 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system such as a microcomputer and executed to perform various processes. Here, the various processes of the CPU of the computer system are stored in the form of a program on a computer-readable recording medium, and the computer reads and executes the program to perform the various processes. The computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, etc. Also, the computer program may be distributed to a computer via a communication line, and the computer that receives the program may execute the program.

[0073] In the above-described embodiment, an example of the hardware configuration of the computer 190 that executes the programs for implementing the various functions of the control device 300 will be described.

[0074] As shown in FIG. 8, the computer 190 provided in the control device 300 includes a processor 195, a memory 196, a storage / playback device 197, an input output interface (hereinafter referred to as "IO I / F") 198, and a communication interface (hereinafter referred to as "communication I / F") 199.

[0075] For example, the processor 195 may be a CPU. For example, the memory 196 may be a medium such as a Random Access Memory (hereinafter referred to as "RAM") that temporarily stores data used by the programs executed by the control device 300. For example, the storage / playback device 197 may be a device for storing data, etc. in an external medium such as a CD-ROM, a DVD, or a flash memory, and for playing back data, etc. from an external medium. For example, the IO I / F 198 may be an interface for inputting and outputting information between the control device 300 and another device. For example, the communication I / F 199 may be an interface for performing communication between the control device 300 and another device via a communication line such as the Internet or a dedicated communication line.

[0076] <Other embodiments> Although the embodiment of the present disclosure has been described above, this embodiment is shown as an example and is not intended to limit the scope of the present disclosure. This embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the present disclosure. This embodiment and its modifications are included in the scope of the present disclosure and its equivalents, as well as in the scope and gist of the present disclosure.

[0077] <Additional Notes> The control device 300, the geothermal heat utilization system 1, the control method, and the program described in the embodiment can be understood, for example, as follows.

[0078] (1) A control device 300 according to a first aspect is a control device 300 for controlling a geothermal heat utilization system 1 including a heat source well equipment 10 including a hot water well 21 and a cold water well 22, and a heat storage auxiliary equipment 100 including a cooling tower 130 and a heat source device 110, and controls the geothermal heat utilization system 1 to operate in a first cold heat storage mode M1 in which hot heat stored in the hot water well 21 is supplied to the cooling tower 130 without passing through the heat source device 110, and cold heat obtained from the cooling tower 130 is stored in the cold water well 22 without passing through the heat source device 110, and a second cold heat storage mode M2 ​​in which the hot heat stored in the hot water well 21 is supplied to the cooling tower 130 via the heat source device 110, and the cold heat obtained from the cooling tower 130 is stored in the cold water well 22 via the heat source device 110. the cold water well 22 to the equipment 120 via the heat source unit 110; a calculation unit 320 that calculates an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well 22; a prediction unit 330 that predicts a required cold storage amount, which is the amount of cold storage required to cool the equipment 120; and a mode determination unit 360 that determines whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount.

[0079] This control device 300 determines whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount, and thereby can store the predicted cold required for cooling the equipment in the cold water well. For this reason, it is unlikely that there will be a shortage or surplus of cold energy stored in the aquifer throughout the entire period. Therefore, the control device 300 can facilitate balancing the heat storage in the aquifer.

[0080] (2) The control device 300 according to the second aspect is the control device 300 of (1), further including an outside air temperature acquisition unit 340 that acquires the outside air temperature, and the mode determination unit 360 determines, based on the outside air temperature, whether to control in the first cold energy storage mode M1 or the second cold energy storage mode M2 ​​when storing cold energy in the cold water well 22.

[0081] This makes it possible to store cold energy in the cold water well 22 by determining whether to control in the first cold energy storage mode M1 or the second cold energy storage mode M2 ​​based on the outside air temperature and selecting an appropriate cold energy storage mode according to the outside air temperature.

[0082] (3) The control device 300 of the third aspect is the control device 300 of (1) or (2), and further includes a cold water temperature acquisition unit 350 that acquires the pumping temperature of the cold water well 22, and the mode determination unit 360 determines whether or not to implement the first cold water storage mode M1 or the second cold water storage mode M2 ​​when storing cold energy in the cold water well 22, based on the accumulated cold storage amount and the pumping temperature of the cold water well 22.

[0083] As a result, when the pumping temperature of the cold water well 22 is equal to or higher than a preset target temperature, cold energy can be stored in the cold water well 22 in an appropriate cold energy storage mode selected based on the accumulated cold energy storage amount and the pumping temperature of the cold water well 22.

[0084] (4) The control device 300 of the fourth aspect is any one of the control devices 300 of (1) to (3), and further includes a cold water temperature acquisition unit 350 that acquires the pumping temperature of the cold water well 22, and the mode determination unit 360 determines whether to control the cold energy stored in the cold water well 22 to the equipment 120 based on the pumping temperature of the cold water well 22 in the first cold energy release mode M3 or the second cold energy release mode M4 when the cold energy stored in the cold water well 22 is supplied to the equipment 120.

[0085] This allows the system to determine whether to control in the first cold heat dissipation mode M3 or the second cold heat dissipation mode M4 based on the pumping temperature of the cold water well 22, and select an appropriate cold heat dissipation mode according to the pumping temperature of the cold water well 22, thereby supplying the cold heat stored in the cold water well 22 to the equipment 120.

[0086] (5) The control device 300 according to the fifth aspect is any one of the control devices 300 of (1) to (4), and the operation control unit 310 suppresses the amount of cold storage to the cold water well 22 when the first cold storage mode M1 or the second cold storage mode M2 ​​is executed and the accumulated amount of cold storage is greater than the required amount of cold storage.

[0087] This makes it possible to reduce the amount of electricity required to store heat in the cold water well 22 when the first cold heat storage mode M1 or the second cold heat storage mode M2 ​​is executed, and also reduces the amount of electricity required to operate the cooling tower 130, the heat source unit 110, various pumps, etc.

[0088] (6) The control device 300 according to the sixth aspect is any one of the control devices 300 of (1) to (5), and always supplies cold heat to the equipment 120 when the first cold heat dissipation mode M3 or the second cold heat dissipation mode M4 is executed.

[0089] This makes it possible to cool a space housing a heat source such as a constantly running computer throughout the day and night all year round.

[0090] (7) A geothermal energy utilization system 1 according to a seventh aspect includes the control device 300 according to any one of (1) to (6), the heat source well facility 10, and the heat storage auxiliary facility 100.

[0091] This geothermal energy utilization system 1 determines whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount, and can store the predicted cold required for cooling the equipment in a cold water well. For this reason, it is unlikely that there will be a shortage or surplus of cold energy stored in the aquifer throughout the entire period. Therefore, the geothermal heat utilization system 1 can easily balance the amount of heat stored in the aquifer.

[0092] (8) The control method according to the eighth aspect includes a heat source well equipment 10 including a hot water well 21 and a cold water well 22, and a heat storage auxiliary equipment 100 including a cooling tower 130 and a heat source unit 110, and includes a first cold heat storage mode M1 in which the hot heat stored in the hot water well 21 is supplied to the cooling tower 130 without passing through the heat source unit 110, and the cold heat obtained from the cooling tower 130 is stored in the cold water well 22 without passing through the heat source unit 110, a second cold heat storage mode M2 ​​in which the hot heat stored in the hot water well 21 is supplied to the cooling tower 130 via the heat source unit 110, and the cold heat obtained from the cooling tower 130 is stored in the cold water well 22 via the heat source unit 110, and The method includes a step of calculating an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well 22, in a computer of a geothermal energy utilization system that can switch between a first cold release mode M3 in which the cold storage stored in the cold water well 22 is supplied to the equipment 120 without going through the heat source equipment 110, and a second cold release mode M4 in which the cold storage stored in the cold water well 22 is supplied to the equipment 120 via the heat source equipment 110, a step of predicting a required cold storage amount, which is the amount of cold storage required to cool the equipment 120, and a step of determining whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount.

[0093] This control method determines whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount, and thereby stores the predicted cold required for cooling the equipment in the cold water well. For this reason, it is unlikely that there will be a shortage or surplus of cold energy stored in the aquifer throughout the entire period. Thus, the control method can facilitate balancing the heat storage in the aquifer.

[0094] (9) The program according to the ninth aspect includes a heat source well equipment 10 including a hot water well 21 and a cold water well 22, and a heat storage auxiliary equipment 100 including a cooling tower 130 and a heat source device 110, and includes a first cold heat storage mode M1 in which hot heat stored in the hot water well 21 is supplied to the cooling tower 130 without passing through the heat source device 110, and cold heat obtained from the cooling tower 130 is stored in the cold water well 22 without passing through the heat source device 110, a second cold heat storage mode M2 ​​in which the hot heat stored in the hot water well 21 is supplied to the cooling tower 130 via the heat source device 110, and the cold heat obtained from the cooling tower 130 is stored in the cold water well 22 via the heat source device 110, and a third cold heat storage mode M3 in which the cold water well 22 is supplied to the cooling tower 130 via the heat source device 110, and the cold heat obtained from the cooling tower 130 is stored in the cold water well 22 via the heat source device 110. A computer of a geothermal energy utilization system that can switch between a first cold heat release mode M3 in which the stored cold heat is supplied to the equipment 120 without going through the heat source unit 110, and a second cold heat release mode M4 in which the cold heat stored in the cold water well 22 is supplied to the equipment 120 via the heat source unit 110, executes processing including the steps of calculating an accumulated cold heat storage amount, which is the amount of cold heat stored in the cold water well 22, predicting a required cold heat storage amount, which is the amount of cold heat storage required to cool the equipment 120, and determining whether to control in the first cold heat storage mode M1 or the second cold heat storage mode M2 ​​based on the accumulated cold heat storage amount and the required cold heat storage amount.

[0095] This program determines whether to control in the first cold storage mode M1 or the second cold storage mode M2 ​​based on the accumulated cold storage amount and the required cold storage amount, and thereby stores the predicted cold required for cooling the equipment in the cold water well. For this reason, it is unlikely that there will be a shortage or surplus of cold energy stored in the aquifer throughout the entire period. Thus, the program can facilitate balancing of the heat storage in the aquifer. [Explanation of symbols]

[0096] 1. Geothermal energy utilization system 3...Well side piping 4...Heat exchanger 10...Heat well equipment 21...Hot water well 22...Cold water well 31…Pump 41...First heat exchanger 42…Second heat exchanger 100…Heat storage auxiliary equipment 101...Refrigerant circuit 102…Equipment side circuit section 102a...Feed line 102b…Return line 103…Cooling tower side circuit section 103a...Feed line 103b…Return line 104…First heat exchanger side circuit 104a…Cold water line 104b…Hot water line 105…Second heat exchanger side circuit 105a…Cold water line 105b…Hot water line 110...Heat source machine 120…Equipment 130...Cooling tower 190…Computer 195…Processor 196…Memory 197…Storage / playback device 198...IO interface 199…Communication I / F 300...Control device 310...Operation control unit 320...Calculation section 330…Prediction Department 340…Outside temperature acquisition unit 350...Cold water temperature acquisition section 360…Mode determination section M1: First cold storage mode M2: Second cold storage mode M3…First cooling heat mode M4…Second cooling heat mode

Claims

1. A control device for controlling a geothermal energy utilization system including a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source machine, The geothermal energy utilization system, A first cold-water storage mode in which the hot water stored in the hot water well is supplied to the cooling tower without passing through the heat source machine, and the cold water obtained from the cooling tower is stored in the cold water well without passing through the heat source machine; A second cold heat storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower via the heat source machine, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source machine; A first cold heat release mode in which the cold heat stored in the cold water well is supplied to equipment without passing through the heat source machine; and A second cold heat dissipation mode in which the cold heat stored in the cold water well is supplied to the equipment via the heat source unit; and A calculation unit for calculating an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well; A prediction unit for predicting a required cold storage amount, which is a cold storage amount required for cooling the device; A mode determination unit that determines whether to control in the first cold storage mode or the second cold storage mode based on the integrated cold storage amount and the required cold storage amount; Prepare Control device.

2. An outside air temperature acquisition unit for acquiring an outside air temperature is further provided, The mode determination unit is When storing the cold energy in the cold water well, it is determined whether the cold energy should be controlled in the first cold energy storage mode or the second cold energy storage mode based on the outside air temperature. The control device according to claim 1 .

3. Further comprising a cold water temperature acquisition unit for acquiring the pumped water temperature of the cold water well; The mode determination unit is When storing the cold energy in the cold water well, it is determined whether the first cold energy storage mode or the second cold energy storage mode should be performed based on the integrated cold energy storage amount and the pumping temperature of the cold water well. The control device according to claim 1 or 2.

4. Further comprising a cold water temperature acquisition unit for acquiring the pumped water temperature of the cold water well; The mode determination unit is When the cold energy stored in the cold water well is supplied to the equipment, it is determined whether the cold energy should be controlled in the first cold energy dissipation mode or the second cold energy dissipation mode based on the pumping temperature of the cold water well. The control device according to claim 1 or 2.

5. The operation control unit is When the first cold storage mode or the second cold storage mode is executed, if the accumulated cold storage amount is larger than the required cold storage amount, the amount of cold storage in the cold water well is suppressed. The control device according to claim 1 or 2.

6. When the first cold heat dissipation mode or the second cold heat dissipation mode is executed, the cold heat is always supplied to the equipment. The control device according to claim 1 or 2.

7. The control device according to claim 1 or 2; The heat source well facility; The heat storage auxiliary equipment; Equipped Geothermal energy utilization system.

8. a step of calculating an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well of a geothermal energy utilization system, which includes a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source device, and which is capable of switching between a first cold storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower without passing through the heat source device, and the cold heat obtained from the cooling tower is stored in the cold water well without passing through the heat source device, a second cold storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower via the heat source device, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source device, a first cold release mode in which the cold heat stored in the cold water well is supplied to equipment without passing through the heat source device, and a second cold release mode in which the cold heat stored in the cold water well is supplied to equipment via the heat source device; predicting a required cold storage amount, the cold storage amount being an amount of cold storage required for cooling the equipment; determining whether to control in the first cold storage mode or the second cold storage mode based on the accumulated cold storage amount and the required cold storage amount; Includes Control methods.

9. a computer of a geothermal energy utilization system including a heat source well facility including a hot water well and a cold water well, and a heat storage auxiliary facility including a cooling tower and a heat source device, the computer being capable of switching between a first cold heat storage mode in which hot heat stored in the hot water well is supplied to the cooling tower without passing through the heat source device, and cold heat obtained from the cooling tower is stored in the cold water well without passing through the heat source device, a second cold heat storage mode in which the hot heat stored in the hot water well is supplied to the cooling tower via the heat source device, and the cold heat obtained from the cooling tower is stored in the cold water well via the heat source device, a first cold heat release mode in which the cold heat stored in the cold water well is supplied to equipment without passing through the heat source device, and a second cold heat release mode in which the cold heat stored in the cold water well is supplied to equipment via the heat source device, Calculating an accumulated cold storage amount, which is the amount of cold storage stored in the cold water well; predicting a required cold storage amount, the cold storage amount being an amount of cold storage required for cooling the equipment; determining whether to control in the first cold storage mode or the second cold storage mode based on the accumulated cold storage amount and the required cold storage amount; Execute a process that includes program.

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