Geothermal heat utilization system

Abstract

To suppress shortage of heat quantity of a hot water well.SOLUTION: The geothermal heat utilization system includes an underground water heat pump in which underground water pumped up from a hot well is used as a hot heat source in a heating period and cooled underground water after use is injected into a cold well in a cooling period, a heat exchanger for performing heat exchange between the underground water and a heat exchange fluid of the underground water hot well, and at least one of a combined heat and power supply device and an exhaust heat utilization device for heating the heated underground water by exhaust heat in the cooling period.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to geothermal energy utilization systems. [Background technology]

[0002] Patent Document 1 describes a method of utilizing groundwater in which, in winter, groundwater pumped up from an underground hot water zone is used as a hot heat source and the cooled water after use is injected into an underground cold water zone, and in summer, groundwater pumped up from the underground cold water zone is used as a cold heat source and the heated water after use is injected into the underground hot water zone.The method involves providing a cold water tank and a cooling tower near the utilization facility on the ground, and in winter, storing the groundwater after use as a hot heat source in the cold water tank, and supplying the water from the cold water tank to the cooling tower at night to be sufficiently cooled by the cold air at night before injecting it into the underground cold water zone.Hot water and cold water are stored in an underground aquifer and used alternately in winter and summer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-159226 Summary of the Invention [Problem to be solved by the invention]

[0004] In a system that combines aquifer thermal storage and a groundwater heat pump, in winter the groundwater heat pump uses groundwater (hot water) pumped up from a hot water well (underground hot water zone) as a heat source, and then pumps the cooled groundwater into a cold water well (underground cold water zone). This allows the groundwater heat pump to function as a heater.

[0005] On the other hand, in the summer, the groundwater heat pump uses groundwater (cold water) pumped up from the cold water well as a cold heat source, and then pumps the heated groundwater back into the hot water well. This allows the groundwater heat pump to function as an air conditioner.

[0006] However, there are cases where the cooling period when the groundwater heat pump is used as an air conditioner is shorter than the heating period when the groundwater heat pump is used as a heater. In such cases, the heat quantity of the hot water well becomes insufficient.

[0007] The object of the present disclosure is to suppress the shortage of heat in hot water wells. [Means for solving the problem]

[0008] The geothermal utilization system of the first aspect is characterized by comprising a groundwater heat pump that uses groundwater pumped from a hot water well as a hot heat source during a heating period, and then charges the cooled groundwater into a cold water well, and that uses groundwater pumped from the cold water well as a cold heat source during a cooling period, and then charges the heated groundwater into the hot water well; a heat exchanger that performs heat exchange between the groundwater and the heat exchange fluid of the groundwater heat pump; and at least one of a combined heat and power generation device and a waste heat utilization device that uses waste heat to heat the groundwater that has been heat exchanged by the heat exchanger during the cooling period.

[0009] According to the above-described embodiment, during the cooling period, the groundwater that has undergone heat exchange by the heat exchanger is heated by the exhaust heat from at least one of the cogeneration system and the exhaust heat utilization system, and then fed into the hot water well. This makes it possible to prevent a shortage of heat in the hot water well.

[0010] A geothermal utilization system according to a second aspect is the geothermal utilization system according to the first aspect, characterized in that the cogeneration system is a fuel cell.

[0011] According to the above aspect, the cogeneration system is a fuel cell, which allows the geothermal energy system to provide air conditioning and electricity for a certain residential area.

[0012] The geothermal utilization system of the third aspect is the geothermal utilization system described in the first aspect, characterized in that during the heating period, at least one of the cogeneration device and the exhaust heat utilization device heats the groundwater pumped from the hot water well and flowing to the heat exchanger using exhaust heat.

[0013] According to the above aspect, during the heating period, at least one of the cogeneration system and the exhaust heat utilization system heats groundwater pumped from the hot water well and flowing to the heat exchanger with exhaust heat, thereby increasing the amount of heat supplied to the groundwater heat pump compared to when groundwater from the hot water well flows to the heat exchanger without being heated. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to suppress the shortage of heat in hot water wells. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing the appearance of a structure using a geothermal utilization system according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic configuration diagram illustrating a geothermal utilization system according to an embodiment of the present disclosure. [Figure 3] FIG. 1 is a schematic diagram illustrating the flow and temperature of each fluid during cooling in a geothermal utilization system according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram illustrating the flow and temperature of each fluid in a geothermal utilization system according to an embodiment of the present disclosure during a heating period. [Figure 5] FIG. 1 is a schematic diagram illustrating a geothermal utilization system according to a comparative example of an embodiment of the present disclosure. [Figure 6] FIG. 10 is a schematic diagram illustrating the flow and temperature of each fluid during a cooling period in a geothermal utilization system according to a comparative example of an embodiment of the present disclosure. [Figure 7] FIG. 10 is a schematic diagram illustrating a geothermal utilization system according to a comparative example of an embodiment of the present disclosure, showing the flow and temperature of each fluid during a heating period. DETAILED DESCRIPTION OF THE INVENTION

[0016] An example of a geothermal utilization system according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 7. FIG. Geothermal utilization system 100 is a system that combines aquifer thermal storage and a groundwater heat pump 10 (hereinafter referred to as "heat pump 10"), and includes, for example, a fuel cell 50 and heat pump 10, as shown in FIG. 1. Heat pump 10 is used to condition the air in each room of an office building 210, and fuel cell 50 generates electricity to be consumed in each room of the office building. The geothermal utilization system 100 will now be described in detail.

[0017] (Geothermal Utilization System 100) 2, the geothermal utilization system 100 includes a heat pump 10, a fuel cell 50, a hot water storage tank 90, a radiant heater 80, a heat exchanger 20, and a heat exchanger 22. The geothermal utilization system 100 also includes a plurality of pipes, a pump (not shown) for moving fluid, and a control unit 96 for controlling each part.

[0018] [Heat pump 10, heat exchanger 20] 2, the heat pump 10 uses groundwater pumped up from a hot water well 110a or a cold water well as its heat source. The heat pump 10 is connected to a pipe 12a through which a heat exchange fluid flows from the heat pump 10 to the heat exchanger 20, and a pipe 12b through which a heat exchange fluid flows from the heat exchanger 20 to the heat pump 10.

[0019] In this configuration, during the cooling period when the heat pump 10 is used as a cooler, heat exchange occurs in the heat exchanger 20 between the groundwater flowing from the cold water well 110b toward the hot water well 110a and the heat exchange fluid of the heat pump 10 circulating through the pipes 12a and 12b. Specifically, the heat pump 10 functions as a cooler by the heat exchange fluid circulating through the pipes 12a and 12b obtaining cold energy through heat exchange. In other words, the heat pump 10 functions as a cooler by using the groundwater pumped up from the cold water well 110b as a cold energy source.

[0020] On the other hand, during the heating period when the heat pump 10 is used as a heater, heat exchange occurs in the heat exchanger 20 between the groundwater flowing from the hot water well 110a to the cold water well 110b and the heat exchange fluid of the heat pump 10 circulating through the pipes 12a and 12b. Specifically, the heat exchange fluid circulating through the pipes 12a and 12b obtains heat through heat exchange, causing the heat pump 10 to function as a heater. In other words, the heat pump 10 functions as a heater by using the groundwater pumped up from the hot water well 110a as a heat source.

[0021] [Fuel cell 50, radiant heater 80, hot water tank 90, heat exchanger 22] The fuel cell 50 generates electricity through a chemical reaction between hydrogen and oxygen. However, the fuel cell 50 also generates heat at the same time as generating electricity. Therefore, as shown in Figure 2, the fuel cell 50 is connected to a pipe through which heated water, which is heated by the exhaust heat of the fuel cell 50, flows.

[0022] Specifically, the fuel cell 50 is connected to a pipe 52 through which heated water flows toward the fuel cell 50, and a pipe 54 through which heated water heated by the exhaust heat of the fuel cell 50 flows.

[0023] Pipe 54 branches into pipe 56 and pipe 66 by three-way valve 30. A radiant heater 80 is provided midway along pipe 66. Pipe 66 then branches into pipe 66a, which is upstream of radiant heater 80 in the flow direction of the heated water, and pipe 66b, which is downstream of radiant heater 80 in the flow direction of the heated water.

[0024] As a result, during the heating period, the radiant heater 80 uses the heat of the heated water heated by the exhaust heat of the fuel cell 50 to increase the surface temperatures of the floor, walls, ceiling, etc. of each room.

[0025] Furthermore, the pipes 56 and 66b are joined to the pipe 58 by the three-way valve 32. Furthermore, a hot water storage tank 90 is provided between the pipe 58 and the pipe 52.

[0026] As a result, the heated water circulates through pipe 52, pipe 54, pipe 56 or 66, and pipe 58. A hot water storage tank 90 is provided along the circulation path, so that the hot water storage tank 90 stores the exhaust heat of the fuel cell 50.

[0027] On the other hand, the hot water tank 90 is connected to a pipe 60 through which heated water flows toward the heat exchanger 22, and a pipe 62 through which heated water that has been heat exchanged by the heat exchanger 22 flows toward the hot water tank 90.

[0028] As a result, the heated water circulates through the pipes 60 and 62. The heat exchanger 22 is provided midway along the circulation path.

[0029] 〔others〕 A pipe 70 is provided between the cold water well 110b and the heat exchanger 20, through which groundwater flows. Furthermore, a pipe 72 is provided between the heat exchanger 20 and the heat exchanger 22, through which groundwater flows.

[0030] A three-way valve 38 is provided midway along piping 70. Piping 70 is divided into piping 70a on the cold water well 110b side and piping 70b on the heat exchanger 20 side. Furthermore, three-way valves 40 and 42 are provided in this order midway along piping 72. Piping 72 is divided into piping 72a connecting heat exchanger 20 and three-way valve 40, piping 72b connecting three-way valve 40 and three-way valve 42, and piping 72c connecting three-way valve 42 and heat exchanger 22.

[0031] In addition, a pipe 64 through which groundwater flows is provided between the three-way valve 40 and the cold water well 110b. Furthermore, a pipe 74 is provided through which groundwater flows between the heat exchanger 22 and the hot water well 110a. A three-way valve 46 is provided midway along the pipe 74. The pipe 74 is divided into a pipe 74a on the heat exchanger 22 side and a pipe 74b on the hot water well 110a side.

[0032] Furthermore, a pipe 76 through which groundwater flows between the hot water well 110a and the three-way valve 42, and a pipe 78 through which groundwater flows between the three-way valve 46 and the three-way valve 38 are provided.

[0033] [Control unit 96] The control unit 96 controls the operation and non-operation of pumps (not shown) that move the groundwater and heated water, and the switching of flow paths by the three-way valves 30, 32, 38, 40, 42, and 46. The control of each part by the control unit 96 will be explained below together with the operation.

[0034] (action) Next, the operation of geothermal utilization system 100 during the cooling and heating periods will be described, comparing it with a comparative geothermal utilization system 200. The operation of geothermal utilization system 100 is performed by the aforementioned control unit 96, which switches the flow paths using three-way valves 30, 32, 38, 40, 42, and 46, controls the operation and deactivation of pumps (not shown), and controls each component.

[0035] First, a geothermal utilization system 200 according to a comparative embodiment will be described, focusing on the differences from the geothermal utilization system 100 according to this embodiment.

[0036] [Geothermal Utilization System 200] As shown in Figure 5, a geothermal utilization system 200 according to a comparative example includes a heat pump 10, pipes 12a and 12b, and a heat exchanger 20. The geothermal utilization system 200 also includes a pipe 202 through which groundwater flows between the cold water well 110b and the hot water well 110a. The heat exchanger 20 is provided midway along the pipe 202. The pipe 202 is divided into a pipe 202a on the hot water well 110a side and a pipe 202b on the cold water well 110b side.

[0037] [Cooling period] The cooling period will be described, as an example, assuming that the temperature of the groundwater in the cold water well 110b is 10°C and the temperature of the heat exchange fluid flowing from the heat pump 10 to the heat exchanger 20 is 21°C.

[0038] -Comparative Geothermal Utilization System 200- In geothermal energy utilization system 200, groundwater from cold water well 110b is pumped up by a pump (not shown), and the pumped groundwater at 10°C flows through pipe 202b to heat exchanger 20, as shown in Figure 6. In heat exchanger 20, heat exchange takes place between the groundwater from cold water well 110b and the heat exchange fluid of heat pump 10 circulating through pipes 12a and 12b.

[0039] Then, through heat exchange in the heat exchanger 20, the temperature of the groundwater rises from 10°C to 15°C, and the groundwater at 15°C is fed into the hot water well 110a. On the other hand, the temperature of the heat exchange fluid drops from 21° C. to 12° C. due to the heat exchange in the heat exchanger 20. Then, the heat pump 10 functions as a cooler.

[0040] -Geothermal utilization system 100 according to this embodiment- In geothermal utilization system 100, groundwater from cold water well 110b is pumped up by a pump (not shown), and the pumped groundwater flows through pipe 70 toward heat exchanger 20, as shown in Fig. 3. In heat exchanger 20, heat exchange occurs between the groundwater from cold water well 110b and the heat exchange fluid of heat pump 10 circulating through pipes 12a and 12b.

[0041] The heat exchange fluid circulating through the pipes 12a and 12b obtains cold heat through heat exchange, and the heat pump 10 functions as a cooler.

[0042] Furthermore, heat exchange takes place in heat exchanger 20, and the groundwater flowing from heat exchanger 20 toward heat exchanger 22 flows through pipe 72a and into pipe 72b through three-way valve 40. The groundwater then passes through three-way valve 42 and flows into pipe 72c toward heat exchanger 22.

[0043] In heat exchanger 22, heat exchange occurs between the groundwater from heat exchanger 20 and the heated water that flows through pipes 60 and 62 and circulates between the groundwater and hot water storage tank 90. ​​Here, the groundwater is heated by heat exchange in heat exchanger 22. Then, the groundwater heated by heat exchange flows through pipe 74a and flows into pipe 74b through three-way valve 46. Then, the groundwater is injected into hot water well 110a.

[0044] Meanwhile, heated water heated by the exhaust heat of the fuel cell 50 circulates between the fuel cell 50 and the hot water storage tank 90. ​​Specifically, the heated water heated by the exhaust heat of the fuel cell 50 flows through the pipe 54, passes through the three-way valve 30, and flows into the pipe 56.

[0045] The heated water that flows into piping 56 flows through three-way valve 32 and piping 58 toward hot water storage tank 90. ​​Furthermore, the heated water that flows into hot water storage tank 90 is temporarily stored in hot water storage tank 90. ​​The heated water stored in hot water storage tank 90 then flows through piping 52 toward fuel cell 50. In this way, heated water that is heated by the exhaust heat of fuel cell 50 circulates between fuel cell 50 and hot water storage tank 90.

[0046] An example of the temperatures of the heat exchange fluid, heated water, and groundwater flowing through each section will be described below. First, let us explain the temperature of the heat exchange fluid. The heat exchange fluid discharged from the heat pump 10 and flowing through the pipe 12a at 21°C undergoes heat exchange with groundwater in the heat exchanger 20, causing the temperature to drop to 12°C. The 12°C heat exchange fluid then flows toward the heat pump 10, which functions as an air conditioner, causing the heat exchange fluid to be discharged from the heat pump 10 at 21°C.

[0047] Next, the temperature of the heated water will be described. The heated water, heated to 60°C by the exhaust heat of the fuel cell 50, flows through pipes 54, 56, and 58 toward the hot water storage tank 90. ​​Furthermore, as the heated water circulates between the hot water storage tank 90 and the heat exchanger 22, the heated water stored in the hot water storage tank 90 becomes 40°C.

[0048] Then, the heated water at 40° C. discharged from the hot water storage tank 90 flows through the pipe 52 or the pipe 60. The heated water flowing through the pipe 52 flows toward the fuel cell 50.

[0049] Meanwhile, the heated water flowing through the pipe 60 exchanges heat with groundwater in the heat exchanger 22, and the temperature of the heated water reaches 33°C. The heated water at 33°C then flows into the hot water storage tank 90.

[0050] Next, the temperature of the groundwater will be explained. Groundwater pumped up from the cold water well 110b and flowing through pipes 70a and 70b at 10°C undergoes heat exchange with a heat exchange medium in heat exchanger 20, causing the temperature to rise to 15°C. The 15°C groundwater then flows through pipes 72a, 72b, and 72c, where it exchanges heat with heated water in heat exchanger 22, causing the temperature to rise to 20°C. The 20°C groundwater is then pumped into the hot water well 110a.

[0051] [Heating period] The heating period will be described, as an example, assuming that the temperature of the groundwater in the hot water well 110a is 13°C and the temperature of the heat exchange fluid flowing from the heat pump 10 to the heat exchanger 20 is 3°C.

[0052] -Comparative Geothermal Utilization System 200- In the geothermal energy utilization system 200, groundwater from the hot water well 110a is pumped up by a pump (not shown), and the pumped groundwater at 13°C flows through a pipe 202a to the heat exchanger 20, as shown in Figure 7. In the heat exchanger 20, heat is exchanged between the groundwater from the hot water well 110a and the heat exchange fluid of the heat pump 10 circulating through the pipes 12a and 12b.

[0053] Then, through heat exchange in the heat exchanger 20, the temperature of the groundwater drops from 13°C to 5°C, and the 5°C groundwater is introduced into the cold water well 110b.

[0054] On the other hand, the temperature of the heat exchange fluid becomes 3° C. to 8° C. due to the heat exchange in the heat exchanger 20. Then, the heat pump 10 functions as a heater.

[0055] -Geothermal utilization system 100 according to this embodiment- In geothermal utilization system 100, groundwater from hot water well 110a is pumped up by a pump (not shown), and the pumped groundwater flows through pipe 76, three-way valve 42, and pipe 72c to heat exchanger 22, as shown in Fig. 4. In heat exchanger 22, heat is exchanged between the groundwater from hot water well 110a and heated water circulating between hot water tank 90 and pipes 60 and 62.

[0056] Furthermore, the groundwater that has undergone heat exchange in heat exchanger 22 flows through pipe 74a, three-way valve 46, pipe 78, three-way valve 38, and pipe 70b toward heat exchanger 20. In heat exchanger 20, heat exchange occurs between the groundwater from heat exchanger 22 and the heat exchange fluid of heat pump 10 circulating through pipes 12a and 12b.

[0057] The heat pump 10 functions as a heater by the heat exchange fluid circulating through the pipes 12a and 12b obtaining heat through heat exchange.

[0058] Furthermore, heat exchange takes place in the heat exchanger 20, and the groundwater flowing from the heat exchanger 20 toward the cold water well 110b flows through the pipe 72a, the three-way valve 40, and the pipe 64, and is then introduced into the cold water well 110b.

[0059] Meanwhile, heated water heated by the exhaust heat of the fuel cell 50 circulates between the fuel cell 50 and the hot water storage tank 90. ​​Specifically, the heated water heated by the exhaust heat of the fuel cell 50 passes through the pipe 54 and the three-way valve 30 and flows into the pipe 56 or the pipe 66a.

[0060] The heated water that has flowed into the pipe 56 flows through the three-way valve 32 and the pipe 58 toward the hot water storage tank 90. ​​The heated water is then temporarily stored in the hot water storage tank 90.

[0061] The heated water that has flowed into pipe 66a passes through radiant heater 80, then flows through pipe 66b, three-way valve 32, and pipe 58 toward hot water storage tank 90. ​​The heated water is then temporarily stored in hot water storage tank 90.

[0062] Moreover, the heated water stored in the hot water storage tank 90 flows through the pipe 52 toward the fuel cell 50. In this way, heated water heated by the exhaust heat of the fuel cell 50 circulates between the fuel cell 50 and the hot water storage tank 90. ​​As the heated water flows through the radiant heater 80, the radiant heater 80 increases the surface temperatures of the floors, walls, ceilings, etc. of each room in the office building 210.

[0063] An example of the temperatures of the heat exchange fluid, heated water, and groundwater flowing through each section will be described below. First, the temperature of the heat exchange fluid will be explained. The heat exchange fluid discharged from the heat pump 10 and flowing through the pipe 12a at 3°C ​​undergoes heat exchange with groundwater in the heat exchanger 20, and its temperature rises to 8°C. The 8°C heat exchange fluid heads toward the heat pump 10. As the heat pump 10 functions as a heater, the heat exchange fluid is discharged from the heat pump 10 at 3°C.

[0064] Next, the temperature of the heated water will be described. Heated water heated to 60°C by the exhaust heat of fuel cell 50 flows through pipe 54 and three-way valve 30 into pipe 56 or pipe 66a. Both the heated water that flows into pipe 56 and the heated water that flows into pipe 66a head toward hot water storage tank 90. ​​Furthermore, as the heated water circulates between hot water storage tank 90 and heat exchanger 22, the heated water stored in hot water storage tank 90 becomes 40°C.

[0065] Then, the heated water at 40° C. discharged from the hot water storage tank 90 flows through the pipe 52 or the pipe 60. The heated water flowing through the pipe 52 flows toward the fuel cell 50.

[0066] Meanwhile, the heated water flowing through the pipe 60 exchanges heat with groundwater in the heat exchanger 22, and the temperature of the heated water reaches 30°C. The heated water at 30°C then flows into the hot water storage tank 90.

[0067] Next, the temperature of the groundwater will be explained. Groundwater at 13°C pumped from the hot water well 110a flows through pipe 76, three-way valve 42, and pipe 72c. The groundwater then exchanges heat with heated water in heat exchanger 22, reducing the temperature of the 13°C groundwater to 14°C. The 14°C groundwater then flows through pipe 74a, three-way valve 46, pipe 78, three-way valve 38, and pipe 70b. The groundwater then exchanges heat with a heat exchange fluid in heat exchanger 20, reducing the temperature of the 14°C groundwater to 5°C. The 5°C groundwater then flows through pipe 72a, three-way valve 40, and pipe 64 and is injected into the cold water well 110b.

[0068] (summary) As described above, in the geothermal utilization system 100, during the cooling period, the groundwater that has undergone heat exchange by the heat pump 10 is heated by the exhaust heat of the fuel cell 50 and then fed into the hot water well 110a. This makes it possible to reduce the heat shortage in the hot water well 110a compared to the geothermal utilization system 200 according to the comparative embodiment.

[0069] Furthermore, in the geothermal utilization system 100, at least a portion of the electricity consumed in each room of the office building 210 is supplied by power generation by the fuel cell 50. Furthermore, the heat pump 10 conditions the air in at least a portion of each room of the office building 210. In this way, the air conditioning and the power supply to each room of the office building 210 can be covered.

[0070] Furthermore, in the geothermal utilization system 100, during the heating period, the fuel cell 50 uses exhaust heat to heat the groundwater pumped from the hot water well 110a and flowing to the heat exchanger 20. This allows the amount of heat supplied to the heat pump 10 to be increased compared to the geothermal utilization system 200 according to the comparative embodiment.

[0071] The geothermal utilization system 100 is also provided with a hot water tank 90. ​​This allows the exhaust heat of the fuel cell 50 to be stored in the hot water tank 90 even when the fuel cell 50 and the heat pump 10 are not operating at the same time.

[0072] Although the present disclosure has been described in detail with respect to a specific embodiment, it will be apparent to those skilled in the art that the present disclosure is not limited to such an embodiment and that various other embodiments are possible within the scope of the present disclosure. For example, in the above embodiment, a fuel cell 50 is used as a cogeneration system, but a gas cogeneration system or a biomass power generation cogeneration system may also be used. Any system that generates exhaust heat during operation may be used.

[0073] Furthermore, in the above embodiment, a cogeneration system (fuel cell 50) has been described, but a waste heat utilization device may also be used. Examples of waste heat utilization devices include a waste heat water heater, a waste heat air precooler, and an exhaust gas heat exchanger. Any device that generates waste heat during operation may be used.

[0074] Furthermore, although not specifically explained in the above embodiment, when groundwater is flowing from the cold water well 110b to the hot water well 110a during periods when the heat pump 10 is not operating, the flowing groundwater may be heated using the exhaust heat from the fuel cell 50 to prevent a shortage of heat in the hot water well 110a.

[0075] In addition, in the above embodiment, heat was exchanged between the heated water flowing through the heat exchanger and the heated water flowing through the heat exchanger 22 by providing a hot water storage tank 90, but heat exchange may also be performed using a heat exchanger instead of the hot water storage tank 90. [Explanation of symbols]

[0076] 10 Heat pump (groundwater heat pump) 20 Heat exchanger 50 Fuel Cell 100 Geothermal Energy Utilization System 110a Hot water well 110b Cold water well

Claims

1. a groundwater heat pump that uses groundwater pumped from a hot water well as a heat source during a heating period, and then charges the cooled groundwater into a cold water well; and that uses groundwater pumped from the cold water well as a cold heat source during a cooling period, and then charges the heated groundwater into the hot water well; a heat exchanger for exchanging heat between the groundwater and a heat exchange fluid of the groundwater heat pump; During the cooling period, at least one of a cogeneration system and a waste heat utilization system that heats the groundwater that has been heat exchanged by the heat exchanger using waste heat; A geothermal utilization system equipped with:

2. the cogeneration system is a fuel cell; The geothermal energy utilization system according to claim 1 .

3. During the heating period, at least one of the cogeneration system and the exhaust heat utilization system heats groundwater pumped from the hot water well and flowing to the heat exchanger by using exhaust heat. The geothermal energy utilization system according to claim 1 .

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