TW202434854A - Control device, geothermal utilization system, control method, and program - Google Patents

Abstract

The control device comprises: a first mode control unit, which controls a geothermal utilization system comprising a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including a heat exhaust recovery mechanism, a cooling tower, or an air-cooled heat pump, so as to supply the cold and heat stored in the cold water well to the machine, and store the warm heat obtained by the machine in the warm water well; and a second mode control unit, which replaces the first mode and controls the geothermal utilization system in a second mode so as to supply the cold and heat stored in the cold water well to the heat storage auxiliary device, and store the warm heat obtained by the heat storage auxiliary device in the warm water well.

Description

Control device, geothermal utilization system, control method, and program

The present disclosure relates to a control device, a geothermal utilization system, a control method, and a program.

In recent years, a geothermal utilization system utilizing heat stored underground has been proposed.

As for the technology related to this, for example, Patent Document 1 discloses a geothermal utilization system that stores the heat discharged from a building underground. [Prior Technical Document] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2018-071949

(Invent the problem you want to solve)

The geothermal utilization system disclosed in Patent Document 1 utilizes the warm heat stored in a heat storage tank as a heat source for a building's heating equipment or a heat source for hot water supply, and utilizes the cold heat stored in another heat storage tank as a heat source for a building's cooling equipment. However, if the amount of warm heat stored in the summer is small, for example in cold regions, there may be a situation where the stored heat in the winter is insufficient.

The purpose of this disclosure is to provide a control device, geothermal utilization system, control method, and program that are not prone to insufficient stored heat. (Technical means to solve the problem)

In order to solve the above-mentioned problems, the control device disclosed in the present invention is equipped with: a first mode control unit, which controls a geothermal utilization system including a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including a heat exhaust recovery mechanism, a cooling tower, or an air-cooled heat pump, so as to supply the cold and heat stored in the aforementioned cold water well to the machine, and store the warm heat obtained by the aforementioned machine in the aforementioned warm water well; and a second mode control unit, which replaces the aforementioned first mode and controls the aforementioned geothermal utilization system in a second mode so as to supply the cold and heat stored in the aforementioned cold water well to the aforementioned heat storage auxiliary device, and store the warm heat obtained by the aforementioned heat storage auxiliary device in the aforementioned warm water well.

The geothermal utilization system disclosed in the present invention comprises: the aforementioned control device, the aforementioned heat source well equipment, and the aforementioned heat storage auxiliary equipment.

The control method disclosed herein is to control a geothermal utilization system comprising: a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including a heat exhaust recovery mechanism, a cooling tower, or an air-cooled heat pump, in a first mode in which the cold and heat stored in the cold water well are supplied to the machine, and the warm heat obtained by the machine is stored in the warm water well; instead of the first mode, the geothermal utilization system is controlled in a second mode in which the cold and heat stored in the cold water well are supplied to the heat storage auxiliary device, and the warm heat obtained by the heat storage auxiliary device is stored in the warm water well.

The program disclosed in this disclosure is to make a computer execute: a geothermal utilization system having: a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including a heat recovery mechanism, a cooling tower, or an air-cooled heat pump, is controlled in a first mode in which the cold and heat stored in the cold water well are supplied to the machine, and the warm heat obtained by the machine is stored in the warm water well; instead of the first mode, the geothermal utilization system is controlled in a second mode in which the cold and heat stored in the cold water well are supplied to the heat storage auxiliary device, and the warm heat obtained by the heat storage auxiliary device is stored in the warm water well. (Effect of the invention)

By using the control device, geothermal utilization system, control method, and program disclosed herein, the stored heat is unlikely to be insufficient.

The following drawings are used to illustrate the embodiments of the present disclosure. The same or equivalent components in all drawings are marked with the same symbols, and the common descriptions are omitted.

<Implementation> Referring to FIG. 1 to FIG. 9 , the implementation of the geothermal utilization system disclosed in the present invention is described. (Structure of geothermal utilization system) As shown in FIG. 1 and FIG. 2 , the geothermal utilization system 1 is provided with: a heat source well device 10, a heat storage auxiliary device 20, a heat pump 30, a heat exchanger 40, and a control device 50. When the heating device is being used in the machine AA (e.g., air conditioning load), the geothermal utilization system 1 utilizes the warm heat stored in the heat source well device 10 as warm water in the heating device, and at the same time, stores the exhaust heat from the machine AA as cold water in the heat source well device 10. When the cooling equipment is being used in the machine AA, the geothermal utilization system 1 utilizes the cold water stored in the heat source well equipment 10 in the cooling equipment, and at the same time stores the exhaust heat from the machine AA as warm water in the heat source well equipment 10.

(Structure of heat source well equipment) The heat source well equipment 10 includes: a warm water well 11, a cold water well 12, and a pipe 13.

The warm water well 11 and the cold water well 12 extend from the ground into the water layer LY. The warm water well 11 and the cold water well 12 are respectively configured as casings with screens, etc., and can take in groundwater from the water layer LY, or return groundwater to the water layer LY from the inside of the warm water well 11 and the cold water well 12. When the geothermal utilization system 1 operates stably, the water layer LY around the warm water well 11 stores warm water, and the water layer LY around the cold water well 12 stores cold water. The warm water well 11 and the cold water well 12 are set at a sufficiently far distance so that the stored warm water and cold water do not mix.

In the geothermal utilization system 1, the heat source well equipment 10 draws groundwater from one of the warm water well 11 and the cold water well 12 to the ground, performs heat exchange on the ground for heat utilization and auxiliary heat storage, and injects it into the other of the warm water well 11 and the cold water well 12. That is, the heat source well equipment 10 has two operation modes, namely, when drawing groundwater from the warm water well 11 and injecting it into the cold water well 12, and when drawing groundwater from the cold water well 12 and injecting it into the warm water well 11.

The pipe 13 connects the warm water well 11 and the cold water well 12. As shown in FIG1 , the first end 131 as one end of the pipe 13 extends toward the inside of the warm water well 11 and is immersed in the groundwater inside the warm water well 11. The second end 132 as the other end of the pipe 13 extends toward the inside of the cold water well 12 and is immersed in the groundwater inside the cold water well 12.

Each of the first end 131 and the second end 132 is provided with a pump PP, a water injection valve VA, a check valve VB, etc., which is configured to pump water from each well into the piping 13, or inject water from the piping 13 into each well. The pump PP can change the output by frequency conversion control according to the command from the control device 50.

As shown in FIG. 2 , the heat source well equipment 10 is additionally equipped with: a rectifying unit 14 , a water injection thermometer 15 , and an adjusting valve 16 .

The rectifying section 14 is provided between the warm water well 11 and the cold water well 12 and the heat exchanger 40. The rectifying section 14 is a connection circuit including the check valves CV1~CV4, and is connected to the pipe 13 in the middle of the pipe 13. The rectifying section 14 rectify the water flow in such a way that the water in the pipe 13 flows toward the heat exchanger 40. Therefore, the water in the pipe 13 flows toward the heat exchanger 40 when drawn from either the warm water well 11 or the cold water well 12. The check valves CV1~CV4 shown in FIG. 2 allow water to flow in the direction of the arrow, and do not allow water to flow in the opposite direction of the arrow.

The water injection thermometer 15 is provided in the middle of the pipe 13 from the heat exchanger 40 to the rectifier 14, and water flows from the heat exchanger 40 to the pipe 13 of the rectifier 14. The water injection thermometer 15 measures the temperature of the water flowing from the heat exchanger 40 to the rectifier 14, and outputs the measurement result to the control device 50.

The regulating valve 16 is provided in the middle of the pipe 13 from the rectifying part 14 to the heat exchanger 40, and water flows from the rectifying part 14 to the pipe 13 of the heat exchanger 40. The regulating valve 16 adjusts the flow rate of water flowing from the rectifying part 14 to the heat exchanger 40 according to the instruction of the control device 50, and controls the water injection amount to each well of the warm water well 11 and the cold water well 12.

(Structure of heat exchanger) The heat exchanger 40 performs heat exchange between the water in the pipe 13 and the medium on the heat pump 30 side and the heat storage auxiliary equipment 20 side. Specifically, the heat exchanger 40 performs heat exchange between the groundwater drawn from the hot water well 11 as the water in the pipe 13 and flowing in the pipe 13, and the medium on the heat pump 30 side and the heat storage auxiliary equipment 20 side. The groundwater after heat exchange is circulated in the pipe 13 by the heat exchanger 40 and injected into the cold water well 12. On the contrary, the heat exchanger 40 performs heat exchange between the groundwater drawn from the cold water well 12 as water in the pipe 13 and flowing in the pipe 13, and the medium on the heat pump 30 side and the heat storage auxiliary equipment 20 side. The groundwater after heat exchange is circulated in the pipe 13 by the heat exchanger 40 and injected into the warm water well 11. The heat exchanger 40 is provided in the middle of the pipe 13 extending on the ground.

If the water passing through the heat exchanger 40 is warm water, warm water heat storage is performed in the warm water well 11. If the water passing through the heat exchanger 40 is cold water, cold water heat storage is performed in the cold water well 12. Here, "warm water" refers to water with a temperature higher than the initial underground temperature of the groundwater with water layer LY, and "cold water" refers to water with a temperature lower than the initial underground temperature of the groundwater with water layer LY. For example, the initial underground temperature of the groundwater with water layer LY is 18°C.

(Structure of heat pump) The heat pump 30 is equipped with a capacitor, an evaporator, a compressor, etc., and is installed between the machine AA and the pipe 13 through the heat exchanger 40. The heat pump 30 cools or heats the medium that exchanges heat between the heat exchanger 40 and the water in the pipe 13. In this way, the heat pump 30 uses the warm or cold heat obtained from the water in the pipe 13 in the machine AA, and on the other hand, the exhaust warm heat or exhaust cold heat discharged from the machine AA is stored in the water in the pipe 13 through the heat exchanger 40. In this embodiment, a turbine heat pump is used as the heat pump 30.

The geothermal utilization system 1 is additionally provided with: a plurality of switching valves 61 and a pump 62 for controlling the flow of the medium between the heat pump 30 and the heat exchanger 40. The plurality of switching valves 61 and the pump 62 are provided between the heat pump 30 and the heat exchanger 40.

The geothermal utilization system 1 is provided with a pump 70 between the heat pump 30 and the machine AA, and a medium flows between the heat pump 30 and the machine AA.

(Configuration of heat storage auxiliary equipment) The heat storage auxiliary equipment 20 heats the cold water in the pipe 13 in the heat exchanger 40 through the medium, and assists the heat storage of the warm water well 11. In this embodiment, the heat storage auxiliary equipment 20 is equipped with: an exhaust heat recovery mechanism 201, a cooling tower 202, and an air-cooled heat pump 203.

The waste heat recovery mechanism 201 recovers waste heat generated in various processes in the factory where the machine AA is installed, and heats the medium of the heat storage auxiliary equipment 20. The waste heat recovered by the waste heat recovery mechanism 201 is used to assist in heat storage of the hot water well 11.

The cooling tower 202 has a general function of cooling the medium of the heat storage auxiliary device 20 by utilizing the heat of vaporization when water is vaporized by contact with the atmosphere, and in this embodiment, it also has a function as a heating tower. That is, the cooling tower 202 can cool the medium of the heat storage auxiliary device 20 when the temperature of the atmosphere is low, such as in winter, but can heat the medium of the heat storage auxiliary device 20 when the temperature of the atmosphere is high, such as in summer. Therefore, the cooling tower 202 can be used not only as a device for assisting cold storage for the cold water well 12, but also as a device for assisting heat storage for the warm water well 11. For example, the cooling tower 202 can also be configured to heat the medium of the heat storage auxiliary equipment 20 when the external air temperature is higher than the set water injection temperature.

The air-cooled heat pump 203 is equipped with a capacitor, an evaporator, a compressor, etc., and heats the medium of the heat storage auxiliary equipment 20. The air-cooled heat pump 203 can operate as a heating device throughout the year. The heat heated by the air-cooled heat pump 203 is used to assist in heat storage in the warm water well 11. On the other hand, the heat heated by the air-cooled heat pump 203 is also used in the heating device in the machine AA.

The heat storage auxiliary device 20 is additionally equipped with: a plurality of switching valves 204, a pump 205, a heat exchanger 206, and an outlet thermometer 207. The primary side of the heat exchanger 206 is connected to the heat exchanger 40 through a pump 62 in a manner that a medium flows between the heat exchanger 40.

The heat storage auxiliary device 20 switches the plurality of switching valves 204 according to the command of the control device 50, thereby switching the circuit for circulating the medium between the heat exchanger 206 and the cooling tower 202, and the circuit for circulating the medium between the heat exchanger 206 and the exhaust heat recovery mechanism 201. Thereby, the heat storage auxiliary device 20 can connect the secondary side of the heat exchanger 206 to the cooling tower 202 or the exhaust heat recovery mechanism 201 in a manner that the medium circulates between the secondary side of the heat exchanger 206 and the cooling tower 202 or the exhaust heat recovery mechanism 201. Therefore, the heat storage auxiliary device 20 can switch the action of storing the heat obtained in the cooling tower 202 in the water in the pipe 13 and the action of storing the heat obtained in the exhaust heat recovery mechanism 201 in the water in the pipe 13 through the heat exchanger 40.

The outlet thermometer 207 is provided at the outlet of the medium toward the heat exchanger 40 on the primary side of the heat exchanger 206 .

The heat storage auxiliary device 20 is additionally provided with a plurality of switching valves 208. The air-cooled heat pump 203 is connected to the heat exchanger 40 via the plurality of switching valves 208 and the pump 62. The heat storage auxiliary device 20 can switch the plurality of switching valves 208 according to the instruction of the control device 50. Thus, the heat storage auxiliary device 20 can switch through the pump 62: the action of connecting to the heat exchanger 40 in a manner of circulating a medium between the air-cooled heat pump 203 and the heat exchanger 40; and the action of disconnecting from the heat exchanger 40 in a manner of not circulating a medium between the air-cooled heat pump 203 and the heat exchanger 40.

The geothermal utilization system 1 is provided with a plurality of switching valves 80 between the air-cooling heat pump 203 and the machine AA. Thus, the geothermal utilization system 1 can switch between: connecting the air-cooling heat pump 203 and the machine AA by circulating a medium between the air-cooling heat pump 203 and the machine AA, and disconnecting the air-cooling heat pump 203 and the machine AA by not circulating a medium between the air-cooling heat pump 203 and the machine AA.

(Configuration of the control device) As shown in FIG3 , the control device 50 functionally includes: a first mode control unit 511, a second mode control unit 512, a third mode control unit 513, an outlet temperature control unit 514, and a water injection temperature control unit 515.

The control device 50 includes a CPU 51, a memory 52, a communication interface 53, and a recording medium 54 as a hardware structure.

The CPU 51 is a processor that performs various functions by operating according to a pre-prepared program. The functions of the CPU 51 will be described later.

The memory 52 has a memory area necessary for the operation of the CPU 51.

The communication interface 53 is a connection interface for communicating with other devices via a communication line, etc., and is configured to send commands to other devices or receive responses from other devices.

The recording medium 54 is a local recording medium provided in the housing of the control device 50 and is a large-capacity storage element such as an HDD or an SSD.

Next, the functions of the CPU 51 of the control device 50 are described. The CPU 51 operates according to a pre-prepared program, thereby performing the functions of the first mode control unit 511, the second mode control unit 512, the third mode control unit 513, the outlet temperature control unit 514, and the water injection temperature control unit 515 as described above.

The first mode control unit 511 controls the geothermal utilization system 1 in the first mode. The first mode is a mode mainly implemented in summer, in which the cold and heat stored in the cold water well 12 are supplied to the machine AA, and the warm heat obtained by the machine AA is stored in the warm water well 11.

The second mode control unit 512 controls the geothermal utilization system 1 in the second mode instead of the first mode. The second mode is a mode in which the cold and heat stored in the cold water well 12 are supplied to the heat storage auxiliary device 20, and the warm heat obtained by the heat storage auxiliary device 20 is stored in the warm water well 11. For example, the second mode control unit 512 controls the geothermal utilization system 1 in the second mode in summer.

The third mode control unit 513 controls the geothermal utilization system 1 in the third mode. The third mode is a mode mainly implemented in winter, in which the warm heat stored in the warm water well 11 is supplied to the machine AA, and the cold heat obtained by the machine AA is stored in the cold water well 12.

The outlet temperature control unit 514 controls the geothermal utilization system 1 so that the temperature of the medium at the outlet of the heat storage auxiliary equipment 20 measured by the outlet thermometer 207 becomes constant.

The injection water temperature control unit 515 controls the geothermal utilization system 1 so that the injection water temperature measured by the injection water thermometer 15 becomes constant as the injection water temperature to the hot water well 11 or the cold water well 12.

(Operation of the control device) The operation of the control device 50 of this embodiment is described. The operation of the control device 50 is equivalent to the embodiment of the control method. The control device 50 implements each step shown in FIG. 4.

First, the first mode control unit 511 controls the geothermal utilization system 1 in the first mode (ST01: first mode control step). The first mode is mainly implemented in summer. The first mode is the action when the machine AA is using the cooling equipment. In the first mode, the first mode control unit 511 transmits an instruction to operate the pump PP of the cold water well 12 and transmits an instruction to open the injection valve VA of the warm water well 11. In addition, in the first mode, the first mode control unit 511 switches the switching valves 61, 204, and 208 in a manner that the medium flows through the machine AA and the heat storage auxiliary equipment 20 does not flow through the medium. Thus, as shown in FIG. 5, the geothermal utilization system 1 pumps the cold water stored in the cold water well 12 into the pipe 13 and supplies it to the heat exchanger 40, thereby cooling the medium on the heat pump 30 side. The cooled medium functions as a refrigerant for cooling equipment in the machine AA. On the other hand, the cold water supplied to the heat exchanger 40 is cooled by cooling the medium on the heat pump 30 side to become warm water, and is discharged toward the warm water well 11 through the pipe 13, and is injected into the warm water well 11. In this way, warm water is stored in the warm water well 11. In addition, the injection temperature control unit 515 performs frequency conversion control of the pump PP of the cold water well 12, control of the regulating valve 16, etc. in a manner that the injection temperature of the warm water well 11 becomes constant.

Following the implementation of ST01, the second mode control unit 512 controls the geothermal utilization system 1 with the second mode instead of the first mode (ST02: second mode control step). For example, the second mode is implemented in summer. At this time, the second mode control unit 512 detects that it is summer by obtaining the year, month, day, average temperature of the outside air, operator input, etc., and controls the geothermal utilization system 1 in the second mode in summer. The second mode is used when it is predicted that there will be insufficient warm water in winter, such as in cold areas. For example, in preparation for winter, the cold water pumped out of the cold water well 12 is heated by the heat storage auxiliary equipment 20 in summer, thereby different from the first mode, which is used to store warm water in the warm water well 11. In the second mode, the second mode control unit 512 transmits an instruction to operate the pump PP of the cold water well 12 and transmits an instruction to open the injection valve VA of the warm water well 11. In addition, in the second mode, the second mode control unit 512 transmits instructions to the switching valves 61, 204, and 208 in such a way that the medium flows through the heat storage auxiliary equipment 20 and the medium does not flow through the machine AA. Thereby, the geothermal utilization system 1 pumps the cold water stored in the cold water well 12 into the pipe 13 and supplies it to the heat exchanger 40. On the other hand, as shown in Figures 6 to 8, the heat storage auxiliary device 20 side of the heat exchanger 40 is supplied with the medium heated in the heat storage auxiliary device 20, and the cold water supplied to the heat exchanger 40 from the cold water well 12 is heated to form warm water. The heated warm water is discharged toward the warm water well 11 through the pipe 13 and is injected into the warm water well 11. In this way, in addition to the warm water stored in the first mode, warm water is stored in the hot water well 11.

In the implementation of ST02, the outlet temperature control unit 514 controls the geothermal utilization system 1 in such a way that the temperature of the medium at the outlet of the heat storage auxiliary equipment 20 becomes constant, and the water injection temperature control unit 515 controls the geothermal utilization system 1 in such a way that the water injection temperature of the warm water well 11 becomes constant. In the implementation of ST02, the control device 50 automatically switches the operation mode of the geothermal utilization system 1 to any of the following heat exhaust utilization mode, cooling tower utilization mode, and air-cooling heat pump utilization mode, taking into account the load of the heating and cooling equipment in the machine AA and the external air temperature.

<Exhaust heat utilization mode> If exhaust heat is generated in various processes in the factory where the machine AA is installed, in the exhaust heat utilization mode, the control device 50 utilizes the exhaust heat and operates the geothermal utilization system 1 in a mode of storing heat in the warm water well 11. In the exhaust heat utilization mode, the injection water temperature control unit 515 performs variable frequency control of the pump PP of the cold water well 12 in a manner that the injection water temperature of the warm water well 11 becomes constant, and at the same time performs bypass control in a manner that the heat obtained in the exhaust heat recovery mechanism 201 can be stored in the water in the pipe 13. Specifically, the water injection temperature control unit 515 performs bypass control of the switching valve 204 transmission instruction by circulating the medium between the exhaust heat recovery mechanism 201 and the heat exchanger 206 as shown in FIG6 , and performs frequency conversion control of the pump 205 and control of the regulating valve 16 in a manner that the temperature of the medium at the outlet of the heat storage auxiliary equipment 20 becomes constant.

<Cooling tower utilization mode> If the exhaust heat generated by each process in the factory where the machine AA is installed is insufficient or insufficient, the control device 50 operates the cooling tower 202 to operate the geothermal utilization system 1 in a mode of storing heat in the warm water well 11 as a cooling tower utilization mode. The operating condition of this mode is that the wet-bulb temperature of the external air is higher than the set injection temperature. In the cooling tower utilization mode, the injection temperature control unit 515 performs variable frequency control of the pump PP of the cold water well 12 in a manner that the injection temperature of the warm water well 11 becomes constant, and at the same time performs bypass control in a manner that the heat obtained in the cooling tower 202 can be stored in the water in the pipe 13. Specifically, the water injection temperature control unit 515 performs bypass control of the switching valve 204 to transmit instructions in a manner that the medium circulates between the cooling tower 202 and the heat exchanger 206 as shown in FIG7 , and performs frequency conversion control of the pump 205 and control of the regulating valve 16 in a manner that the temperature of the medium at the outlet of the heat storage auxiliary equipment 20 becomes constant.

<Air-cooling heat pump utilization mode> In the exhaust heat utilization mode and cooling tower utilization mode, if the warm water for heating equipment is insufficient in winter, the control device 50 operates the air-cooling heat pump 203 to store heat in the warm water well 11 to operate the geothermal utilization system 1 as the air-cooling heat pump utilization mode. At this time, the water injection temperature control unit 515 transmits instructions to the switching valve 208 by circulating the medium between the air-cooling heat pump 203 and the heat exchanger 40 as shown in Figure 8. The feature of this mode is that the necessary warm water heat can be stored at any time, and the heating equipment can be operated in summer, so the COP (Coefficient Of Performance) of the air-cooling heat pump 203 is high, which can improve the COP of the entire system.

After ST02 is completed, ST01 is implemented again, and then ST01 and ST02 are repeated, for example, during the summer.

Following the implementation of ST01 and ST02, the third mode control unit 513 controls the geothermal utilization system 1 in the third mode (third mode control step: ST03). The third mode is mainly implemented in winter. The third mode is the action when the machine AA is using the heating equipment. In the third mode, the third mode control unit 513 transmits an instruction to operate the pump PP of the warm water well 11 and transmits an open instruction to the injection valve VA of the cold water well 12. In addition, in the third mode, the third mode control unit 513 controls the switching valves 61, 204, and 208 in a manner that the medium flows through the machine AA and the medium does not flow through the heat storage auxiliary equipment 20. Thus, as shown in FIG. 9 , the geothermal utilization system 1 pumps the warm water stored in the warm water well 11 into the piping 13 and supplies it to the heat exchanger 40, thereby heating the medium on the heat pump 30 side, and the heated medium functions as a heat medium for heating equipment in the machine AA. On the other hand, the warm water supplied to the heat exchanger 40 is converted into cold water by heating the medium on the heat pump 30 side, and is discharged toward the cold water well 12 through the piping 13 and injected into the cold water well 12. Thus, cold water is stored in the cold water well 12. In ST03, the injection temperature control unit 515 performs frequency conversion control of the pump PP of the warm water well 11, control of the regulating valve 16, etc. in such a way that the injection temperature of the cold water well 12 becomes constant.

In the third mode, if the warm water stored in the warm water well 11 is insufficient, the geothermal utilization system 1 connects the air-cooling heat pump 203 to the machine AA by switching a plurality of switching valves 80 so that a medium flows between the machine AA and the air-cooling heat pump 203, and the heating equipment in the machine AA utilizes the air-cooling heat pump 203.

(Function and Effect) According to this embodiment, the control device 50 can store the heat obtained by the heat storage auxiliary device 20 in the hot water well 11 in addition to the heat obtained by the machine AA. Therefore, the stored heat is not likely to be insufficient.

In addition, according to this embodiment, since the exhaust heat recovery mechanism 201 recovers the exhaust heat of the factory, the exhaust heat can be effectively utilized. Therefore, the environmental burden is reduced.

In addition, according to this embodiment, the control device 50 can control the temperature of the medium at the outlet of the heat storage auxiliary device 20 to be constant. Therefore, the heat storage auxiliary device 20 can stably assist the heat storage of the hot water well 11.

Furthermore, according to the present embodiment, the control device 50 can control the injection temperature of the water into the hot water well 11 to be constant, and thus the temperature of the hot water well 11 can be maintained constant.

In addition, according to this embodiment, the control device 50 is controlled in the second mode in summer, so that the heat obtained by the heat storage auxiliary device 20 can be stored in the warm water well 11 in summer. Therefore, the geothermal utilization system 1 can easily store heat even in cold areas and can continue to utilize geothermal heat.

Generally speaking, in geothermal utilization systems that utilize aquifers, it is necessary to maintain a year-round heat balance and a balance of headwater/returnwater volume when operating for a long period of time. If geothermal utilization is simply performed without considering the difference in air conditioning load (heat) between summer and winter, there will be a heat imbalance or volume imbalance between cold water and warm water. Therefore, the heat storage block of cold exhaust heat or warm exhaust heat continues to expand, making it impossible to efficiently utilize geothermal energy, and there is a possibility of adversely affecting the underground environment. For example, in western Japan, when the air conditioning load in summer is greater than the heating load in winter, the balance of heat and matter can be maintained by storing cold in refrigeration machines/cooling towers in addition to normal operation in winter. However, when the winter heating load is greater than the summer cooling load, as in eastern Japan, the cold storage becomes excessive, so the warm water heat must be stored in the summer. As shown above, if the means of storing the warm water heat in the summer are not examined, it is difficult to introduce the geothermal utilization system in cold areas. For example, in the Netherlands, there is an example of using the geothermal utilization system in conjunction with the cooling load, but in cold areas such as Hokkaido, the geothermal utilization system cannot be used in areas with less cooling load in the summer. In contrast, the control device 50 of this embodiment can store the warm heat obtained by the heat storage auxiliary device 20 in the summer in the warm water well 11, so the geothermal utilization system 1 can be easily introduced to cold areas.

Furthermore, according to the present embodiment, heat exchange is performed between the water in the pipe 13 and the medium on the machine AA side and the heat storage auxiliary equipment 20 side, so that heat reception between the heat source well equipment 10 and the machine AA and between the heat source well equipment 10 and the heat storage auxiliary equipment 20 is easily performed.

In addition, according to the present embodiment, the heat storage auxiliary equipment 20 includes the cooling tower 202, so that natural energy can be effectively utilized, energy saving can be achieved, and carbon neutrality can be contributed to.

In addition, according to the present embodiment, since the heat storage auxiliary equipment 20 includes: an exhaust heat recovery mechanism 201, a cooling tower 202, and an air-cooled heat pump 203, the system can be constructed in accordance with the user's purpose.

<Variations> In the above-mentioned embodiment, the second mode control unit 512 controls the geothermal utilization system 1 in the second mode in summer, but if the heat obtained by the heat storage auxiliary equipment 20 can be stored in the warm water well 11, it can also be controlled arbitrarily. In the first variant, the second mode control unit 512 can also control the geothermal utilization system 1 in the second mode in spring, autumn, or winter other than summer. In the second variant, the second mode control unit 512 can also control the geothermal utilization system 1 in the second mode regardless of the season. In the third variant, the second mode control unit 512 can also control in the second mode when the external air temperature is higher than the set water injection temperature.

In the above-mentioned embodiment, the heat storage auxiliary equipment 20 is equipped with: an exhaust heat recovery mechanism 201, a cooling tower 202, and an air-cooled heat pump 203, but it can be configured arbitrarily as long as it can assist in the heat storage of the warm water well 11. In a variant, the heat storage auxiliary equipment 20 can also be equipped with: an exhaust heat recovery mechanism 201 and a cooling tower 202, but not equipped with: an air-cooled heat pump 203. In other variants, the heat storage auxiliary equipment 20 can also be equipped with: at least one of the exhaust heat recovery mechanism 201, the cooling tower 202, and the air-cooled heat pump 203.

In the above-mentioned embodiment, in the cooling tower utilization mode of ST02, the heat storage auxiliary equipment 20 utilizes only the cooling tower 202 among the exhaust heat recovery mechanism 201, the cooling tower 202, and the air-cooled heat pump 203, but it can be used at will if it can assist in the heat storage of the warm water well 11. In a variant example, in the cooling tower utilization mode, the heat storage auxiliary equipment 20 can also utilize the exhaust heat recovery mechanism 201 and the cooling tower 202 at the same time. For example, as shown in FIG. 10, the water injection temperature control unit 515 can also be bypassed by circulating the medium between the cooling tower 202 and the heat exchanger 206, and between the exhaust heat recovery mechanism 201 and the heat exchanger 206. Thus, the heat storage auxiliary equipment 20 can utilize the exhaust heat recovery mechanism 201 and the cooling tower 202 simultaneously.

In the above-mentioned embodiment, in the air-cooling heat pump utilization mode of ST02, only the air-cooling heat pump 203 is utilized among the exhaust heat recovery mechanism 201, the cooling tower 202, and the air-cooling heat pump 203, but any of them can be utilized if they can assist in the heat storage of the warm water well 11. In a variant example, in the air-cooling heat pump utilization mode, the heat storage auxiliary equipment 20 can also utilize the exhaust heat recovery mechanism 201, the cooling tower 202, and the air-cooling heat pump 203 at the same time. For example, as shown in FIG. 11, the control device 50 can also perform bypass control by circulating a medium between the air-cooling heat pump 203 and the heat exchanger 40, between the cooling tower 202 and the heat exchanger 206, and between the exhaust heat recovery mechanism 201 and the heat exchanger 206. Thus, the heat storage auxiliary equipment 20 can simultaneously utilize the exhaust heat recovery mechanism 201, the cooling tower 202, and the air-cooled heat pump 203.

Among them, in each of the above-mentioned embodiments, the program for realizing various functions of the control device 50 is recorded on a computer-readable recording medium, so that the computer system reads the program recorded on the recording medium and executes it, thereby performing various processing. Here, the various processing processes of the CPU 51 of the computer system are recorded in the form of a program on a computer-readable recording medium, and the computer reads the program and executes it, thereby performing the above-mentioned various processing. In addition, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, etc. In addition, the computer program can also be distributed to the computer via a communication line, etc., and the computer to which the distribution is sent executes the program.

<Other implementation forms> The above describes the implementation forms of the present disclosure, which are shown as examples and are not intended to limit the scope of the present disclosure. The implementation forms can be implemented in various other forms, and various omissions, substitutions, and changes can be made within the scope of the present disclosure. The implementation forms or their variations are included in the scope or gist of the present disclosure, and are set to be included in the scope of the present disclosure and its equivalent scope.

<Note> The control device 50, geothermal utilization system 1, control method, and program described in the above-mentioned embodiment are, for example, as follows.

(1) The control device 50 of the first embodiment comprises: a first mode control unit 511, which comprises: a heat source well device 10 including a warm water well 11 and a cold water well 12, and a geothermal utilization system 1 including a heat storage auxiliary device 20 including a heat recovery mechanism 201, a cooling tower 202, or an air-cooled heat pump 203, so as to supply the cold and heat stored in the cold water well 12 to the machine AA, and to The heat obtained by the machine AA is controlled by a first mode in which the heat is stored in the aforementioned hot water well 11; and the second mode control unit 512 replaces the aforementioned first mode and controls the aforementioned geothermal utilization system 1 to supply the cold and heat stored in the aforementioned cold water well 12 to the aforementioned heat storage auxiliary equipment 20, and to store the heat obtained by the aforementioned heat storage auxiliary equipment 20 in the aforementioned hot water well 11 in a second mode.

According to this embodiment, the control device 50 can store the heat obtained by the heat storage auxiliary device 20 in the hot water well 11 in addition to the heat obtained by the machine AA. Therefore, the stored heat is not likely to be insufficient.

(2) The control device 50 of the second aspect is the control device 50 of (1), wherein the waste heat recovery mechanism 201 recovers waste heat from the factory.

With this aspect, the exhaust heat recovery mechanism 201 can effectively utilize the exhaust heat. Therefore, the environmental burden is reduced.

(3) The control device 50 of the third aspect is the control device 50 of (1) or (2), wherein the control device 50 further comprises: an outlet temperature control unit 514, which controls the geothermal utilization system 1 in such a way that the temperature of the medium at the outlet of the heat storage auxiliary equipment 20 becomes constant.

According to this aspect, the control device 50 can control the temperature of the medium at the outlet of the heat storage auxiliary device 20 to be constant. Therefore, the heat storage auxiliary device 20 can stably assist the heat storage of the hot water well 11.

(4) The control device 50 of the fourth aspect is any one of the control devices 50 of (1) to (3), wherein the control device 50 further comprises: an injection temperature control unit 515 for controlling the geothermal utilization system 1 in such a way that the injection temperature of the hot water well 11 becomes constant.

According to this aspect, the control device 50 can control the injection temperature of the hot water well 11 to be constant, thereby maintaining the temperature of the hot water well 11 to be constant.

(5) The control device 50 of the fifth aspect is the control device 50 as described in any one of (1) to (4), wherein the second mode control unit 512 controls the geothermal utilization system in the second mode in summer.

According to this embodiment, the control device 50 can store the heat obtained by the heat storage auxiliary device 20 in the hot water well 11 in summer. Therefore, the geothermal utilization system 1 can easily store heat even in cold areas and can continue to utilize geothermal heat.

(6) The control device 50 of the sixth aspect is the control device 50 of any one of (1) to (5), wherein the aforementioned heat source well equipment 10 further comprises: a pipe 13, which connects the aforementioned warm water well 11 with the aforementioned cold water well 12; and a heat exchanger 40, which performs heat exchange between the water in the aforementioned pipe 13 and the medium on the aforementioned machine AA side and the aforementioned heat storage auxiliary equipment 20 side.

According to this aspect, heat exchange is performed between the water in the pipe 13 and the medium on the machine AA side and the heat storage auxiliary equipment 20 side, so heat reception between the heat source well equipment 10 and the machine AA and between the heat source well equipment 10 and the heat storage auxiliary equipment 20 is easy.

(7) The seventh aspect of the geothermal utilization system 1 comprises: a control device 50 as described in any one of (1) to (6); the aforementioned heat source well equipment 10; and the aforementioned heat storage auxiliary equipment 20.

According to this aspect, the geothermal utilization system 1 can store the heat obtained by the heat storage auxiliary equipment 20 in the hot water well 11 in addition to the heat obtained by the machine AA. Therefore, the stored heat is not likely to be insufficient.

(8) The control method of the eighth aspect is to control the geothermal utilization system 1, which is provided with: a heat source well device 10 including a warm water well 11 and a cold water well 12, and a heat storage auxiliary device 20 including a heat exhaust recovery mechanism 201, a cooling tower 202, or an air-cooled heat pump 203, in a first mode in which the cold and heat stored in the aforementioned cold water well 12 are supplied to the machine AA, and the warm heat obtained by the aforementioned machine AA is stored in the aforementioned warm water well 11; instead of the aforementioned first mode, the aforementioned geothermal utilization system 1 is controlled in a second mode in which the cold and heat stored in the aforementioned cold water well 12 are supplied to the aforementioned heat storage auxiliary device 20, and the warm heat obtained by the aforementioned heat storage auxiliary device 20 is stored in the aforementioned warm water well 11.

According to this aspect, the control method can store the heat obtained by the heat storage auxiliary device 20 in the hot water well 11 in addition to the heat obtained by the machine AA. Therefore, the stored heat is not likely to be insufficient.

(9) The program of the ninth aspect is to cause a computer to execute: controlling a geothermal utilization system 1 having a heat source well device 10 including a warm water well 11 and a cold water well 12, and a heat storage auxiliary device 20 including a heat exhaust recovery mechanism 201, a cooling tower 202, or an air-cooled heat pump 203, in a first mode in which the cold and heat stored in the cold water well 12 are supplied to a machine AA, and the warm heat obtained by the machine AA is stored in the warm water well 11; and replacing the first mode, controlling the geothermal utilization system 1 in a second mode in which the cold and heat stored in the cold water well 12 are supplied to the heat storage auxiliary device 20, and the warm heat obtained by the heat storage auxiliary device 20 is stored in the warm water well 11.

According to this embodiment, in addition to the heat obtained by the machine AA, the program can store the heat obtained by the heat storage auxiliary device 20 in the hot water well 11. Therefore, the stored heat is not likely to be insufficient. [Industrial Applicability]

By adopting the above-mentioned aspect, the stored heat is not easy to be insufficient.

1: Geothermal utilization system 10: Heat source well equipment 11: Warm water well 12: Cold water well 13: Piping 14: Rectification unit 15: Water injection thermometer 16: Adjustment valve 20: Heat storage auxiliary device 30: Heat pump 40: Heat exchanger 50: Control device 51: CPU 52: Memory 53: Communication interface 54: Recording medium 61: Switching valve 62: Pump 70: Pump 80: Switching valve 131: First end 132: Second end 201: Exhaust heat recovery mechanism 202: Cooling tower 203: Air-cooled heat pump 204: Switching valve 205: Pump 206: heat exchanger 207: outlet thermometer 208: switching valve 511: first mode control unit 512: second mode control unit 513: third mode control unit 514: outlet temperature control unit 515: water injection temperature control unit AA: machine CV1: check valve CV2: check valve CV3: check valve CV4: check valve LY: water layer PP: pump VA: water injection valve VB: check valve

[Figure 1] is a schematic diagram of a geothermal utilization system according to an embodiment of the present disclosure. [Figure 2] is a system diagram of a geothermal utilization system according to an embodiment of the present disclosure. [Figure 3] is a block diagram of a control device according to an embodiment of the present disclosure. [Figure 4] is a flow chart of a control method according to an embodiment of the present disclosure. [Figure 5] is a diagram showing the operation of the first mode of the geothermal utilization system according to an embodiment of the present disclosure. [Figure 6] is a diagram showing the operation of the second mode (heat exhaust utilization mode) of the geothermal utilization system according to an embodiment of the present disclosure. [Figure 7] is a diagram showing the operation of the second mode (cooling tower utilization mode) of the geothermal utilization system according to an embodiment of the present disclosure. [Figure 8] is a diagram showing the operation of the second mode (air-cooling heat pump utilization mode) of the geothermal utilization system according to an embodiment of the present disclosure. [Figure 9] is a diagram showing the operation of the third mode of the geothermal utilization system of the embodiment of the present disclosure. [Figure 10] is a diagram showing the operation of a modified example of the second mode (cooling tower utilization mode) of the geothermal utilization system of the embodiment of the present disclosure. [Figure 11] is a diagram showing the operation of a modified example of the second mode (air-cooling heat pump utilization mode) of the geothermal utilization system of the embodiment of the present disclosure.

50: Control device

51:CPU

52: Memory

53: Communication interface

54: Recording media

511: First mode control unit

512: Second mode control unit

513: Third mode control unit

514: Outlet temperature control unit

515: Water injection temperature control unit

Claims (9)

A control device, which comprises: A first mode control unit, which controls a geothermal utilization system comprising: a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including an exhaust heat recovery mechanism, a cooling tower, or an air-cooled heat pump, in a first mode in which the cold and heat stored in the cold water well are supplied to a machine, and the warm heat obtained by the machine is stored in the warm water well; and A second mode control unit, which replaces the first mode and controls the geothermal utilization system in a second mode in which the cold and heat stored in the cold water well are supplied to the heat storage auxiliary device, and the warm heat obtained by the heat storage auxiliary device is stored in the warm water well. A control device as claimed in claim 1, wherein the waste heat recovery mechanism recovers waste heat from the factory. The control device of claim 1 or 2 further comprises: an outlet temperature control unit for controlling the geothermal utilization system in such a way that the temperature of the medium at the outlet of the heat storage auxiliary equipment becomes constant. A control device as claimed in claim 1 or 2, further comprising: an injection water temperature control unit for controlling the geothermal utilization system in such a way that the injection water temperature of the warm water well becomes constant. A control device as claimed in claim 1 or 2, wherein the second mode control unit controls the geothermal utilization system in the second mode in summer. A control device as claimed in claim 1 or 2, wherein the heat source well equipment further comprises: A pipe connecting the warm water well and the cold water well; and A heat exchanger for performing heat exchange between the water in the pipe and the medium on the machine side and the heat storage auxiliary equipment side. A geothermal utilization system, which comprises: The control device as in claim 1 or 2; The aforementioned heat source well equipment; and The aforementioned heat storage auxiliary equipment. A control method is to control a geothermal utilization system having: a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including an exhaust heat recovery mechanism, a cooling tower, or an air-cooled heat pump, in a first mode in which the cold and heat stored in the cold water well are supplied to a machine, and the warm heat obtained by the machine is stored in the warm water well; Instead of the first mode, the geothermal utilization system is controlled in a second mode in which the cold and heat stored in the cold water well are supplied to the heat storage auxiliary device, and the warm heat obtained by the heat storage auxiliary device is stored in the warm water well. A program that causes a computer to execute: Controlling a geothermal utilization system having a heat source well device including a warm water well and a cold water well, and a heat storage auxiliary device including a heat recovery mechanism, a cooling tower, or an air-cooled heat pump in a first mode in which the cold and heat stored in the cold water well are supplied to a machine, and the warm heat obtained by the machine is stored in the warm water well; Controlling the geothermal utilization system in a second mode in which the cold and heat stored in the cold water well are supplied to the heat storage auxiliary device, and the warm heat obtained by the heat storage auxiliary device is stored in the warm water well, instead of the first mode.

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