Geothermal heat utilization cooling system for cooling water in buried tank with rainwater

Abstract

To provide a cooling system capable of continuing indoor cooling in a geothermal heat utilization cooling system.SOLUTION: A geothermal heat utilization cooling system comprises: a water temperature gauge disposed at a predetermined position from a bottom of a tank; pump-up piping for pumping up water from the bottom of the tank; a pumping-up pump in the pump-up piping; a water feed pipe connected from the pumping-up pump to a water inlet port of a heat exchanger; a water drain pipe connected to a water outlet port of the heat exchanger; a return pipe which is connected to the water drain pipe and returns water to an upper part of the tank; a rainwater temperature gauge which detects a temperature of rainwater; a rainwater supply piping by which rainwater is pumped up and discharger lower than a water absorption port of the piping; a rainwater supply valve in the rainwater supply piping; and a controller which performs control so as to open the rainwater supply valve if a value of the rainwater temperature gauge is lower than a value of the water temperature gauge.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cooling system capable of cooling in the summer using water in a tank buried underground, and relates to a cooling system in which the water in the tank is cooled with rainwater. [Background technology]

[0002] In recent years, as houses and buildings become more airtight and insulated, there is a growing demand for the active use of natural energy. Geothermal energy has long been used as one form of natural energy. In particular, heating systems that utilize relatively high-temperature geothermal layers have been put into practice.

[0003] On the other hand, at a relatively shallow depth of about 2 to 5 meters below the surface, the ground temperature throughout the year is almost constant and is the same as the annual average temperature of the region, so it is thought that this could be used for air conditioning during the hot summer months.

[0004] Patent Document 1 discloses a heat exchange method in which a heat carrier fluid (for example, water) heated by a heat exchanger installed indoors is sent to a tank buried underground, and heat is dissipated from the tank into the ground.

[0005] Furthermore, Patent Document 2 discloses a system in which ordinary tap water is stored in a tank buried underground, and a spiral-shaped heat exchanger is placed inside it through which air can flow, cooling warm air inside the house with the water in the tank and then returning the air to the house, thereby providing cooling. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 57-031743 [Patent Document 2] JP 2002-013829 A Summary of the Invention [Problem to be solved by the invention]

[0007] By utilizing underground temperatures that are relatively lower than summer air temperatures, electricity consumption can be reduced by not needing to operate a heat pump. However, there is a limit to the amount of heat that can be released around a buried tank, and once the temperature of the soil around the tank has risen, it takes time for it to cool down again. Therefore, the method described in the patent document had the problem that when the temperature inside the tank rose, it was necessary to wait for natural cooling. [Means for solving the problem]

[0008] The present invention has been devised in consideration of the above-mentioned problems, and provides an air conditioning system that can release heat from indoors and continue to cool the indoors even after the temperature of the water in a buried tank rises as a result of heat exchange and until the water in the tank cools down.

[0009] More specifically, the geothermal cooling system according to the present invention, which cools water in a buried tank with rainwater, is as follows: A heat exchanger installed in the building; A tank buried underground for storing water; A water temperature gauge disposed at a predetermined position from the bottom of the tank; a pumping pipe for pumping up the water stored in the tank from the bottom of the tank; a pump disposed in the pumping pipe; and A water supply pipe connected from the pump to the water inlet of the heat exchanger; A drain pipe connected to the water outlet of the heat exchanger; a return pipe connected to the drain pipe for returning water to an upper portion of the tank; A rainwater thermometer that detects the temperature of rainwater; A rainwater supply pipe that discharges the rainwater into the tank below a water intake port of the pumping pipe of the tank; A rainwater supply valve provided in the rainwater supply pipe; The system further comprises a controller that controls the rainwater supply valve to open when the value of the rainwater thermometer is lower than the value of the water thermometer. Effect of the Invention

[0010] According to the geothermal energy cooling system of the present invention, which uses rainwater to cool the water in a buried tank, even if there is only one buried tank, the water in the tank is cooled (replaced) with rainwater when it rains, such as during a sudden shower, so there is a high probability that the water in the tank, which has risen in temperature, will be replaced with rainwater which is cooler than the water (almost equal to the wet-bulb temperature of the air).

[0011] In addition, by burying multiple such tanks and using the water in the next tank when the water in one tank reaches a specified temperature or higher, the time during which heat can be exchanged indoors can be extended. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing the configuration of a geothermal cooling system according to the present invention, which uses rainwater to cool water in a buried tank. [Diagram 2] FIG. 11 is a diagram showing, in bold lines, the water piping route when the first tank is selected. [Diagram 3] FIG. 11 is a diagram showing, in bold lines, the water piping route when the second tank is selected. [Figure 4] This is a diagram showing the piping route in bold lines when it rains when the first tank is selected. [Diagram 5] FIG. 4 is a flow chart showing a process flow of a controller. [Figure 6] FIG. 13 is a flow diagram showing the process flow of the "rain + tank used" subroutine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A geothermal cooling system (hereinafter simply referred to as a "cooling system") that uses rainwater to cool water in a buried tank according to the present invention will be described below with reference to drawings and examples. Note that the following description illustrates one embodiment of the present invention and one example, and the present invention is not limited to the following description. The following description can be modified within the scope of the present invention.

[0014] The configuration of a cooling system according to the present invention is shown in Fig. 1. The cooling system 1 according to the present invention includes a heat exchanger 10 provided inside a building H, a tank 12 (tank 12A, tank 12B) for storing water, a water thermometer 14 (water thermometer 14Aα, water thermometer 14Aβ, water thermometer 14Bα, water thermometer 14Bβ), a pumping pipe 16 (pumping pipe 16A, pumping pipe 16B), a pumping pump 18, a water supply pipe 20, a drain pipe 22, a return pipe 24 (return pipe 24A, return pipe 24B), a rainwater thermometer 26, a rainwater supply pipe 28, and a controller 50.

[0015] The type of the building H is not particularly limited, and may be various types of buildings H, such as a house where people live, a warehouse for storing things, or a barn for raising livestock or other animals. The inside of the building H is called the indoors.

[0016] At least one heat exchanger 10 is placed indoors. Water passes through the heat exchanger 10 as a heat carrier fluid, and a known mechanism is placed inside the heat exchanger 10 to exchange heat between the indoor heat and the water heat. The heat exchanger 10 is provided with a water inlet 10a through which water from the tank 12 is poured, and a water outlet 10b through which the water after heat exchange is discharged. In other words, water that is lower in temperature than the indoor temperature enters the heat exchanger 10 from the water inlet 10a, and the water whose temperature has increased after heat exchange is discharged from the water outlet 10b.

[0017] There may be a plurality of heat exchangers 10 indoors. The plurality of heat exchangers 10 may each receive water sent from a tank 12, which will be described later, in parallel. This is called a parallel connection of the heat exchangers 10. Alternatively, water from the tank 12 may be directly injected into one heat exchanger 10, and water that has passed through the one heat exchanger 10 may be injected into the other heat exchangers 10. This is called a series connection of the heat exchangers 10.

[0018] The tank 12 is buried underground at a certain distance from the building H. Here, the explanation will be continued assuming that there are two tanks, tank 12A and tank 12B, but there may be only one tank, or three or more tanks. Hereinafter, tank 12A will be referred to as the first tank 12A, and tank 12B will be referred to as the second tank 12B. In addition, when referring to the first tank 12A and the second tank 12B collectively, they will be simply referred to as tank 12.

[0019] The tank 12 is buried at its deepest point about 5 to 8 meters below the ground surface. Tanks 12 having a certain height from the deepest point of the hole to the ground surface can be preferably used, but tanks 12 that are completely buried underground are not excluded. For example, cylindrical tanks (having side walls and a bottom surface) can be preferably used.

[0020] A water temperature gauge 14 is provided at the bottom of the tank 12. The water temperature gauges 14 in the first tank 12A and the second tank 12B are referred to as water temperature gauge 14A and water temperature gauge 14B, respectively. It is preferable that a plurality of water temperature gauges 14 are provided in one tank 12. Here, they are named α, β, ... from the deepest to the deepest. For example, the first tank 12A has water temperature gauge 14Aα and water temperature gauge 14Aβ from the deepest to the deepest. Similarly, the second tank 12B is provided with water temperature gauge 14Bα and water temperature gauge 14Bβ. The reason for providing a plurality of water temperature gauges 14 in one tank 12 is to know the extent to which water has been replaced with rainwater when heat exchange progresses and the water temperature rises. Here, a case where there are two water temperature gauges 14, α and β, will be described. However, there may be three or more water temperature gauges, or just one.

[0021] When referring to the water thermometers 14 at positions α and β of the water thermometers 14A and 14B of the first tank 12A and the second tank 12B, respectively, collectively, they will be referred to as water thermometer 14α, water thermometer 14β, etc.

[0022] The water thermometer 14α, which is placed at the deepest position, is located almost close to the bottom of the tank 12. This is because it is necessary to know the temperature of the water, as it is sent from the water in this vicinity toward the heat exchanger 10. The water thermometer 14β, which is placed at a higher position than the water thermometer 14α (at a shallower position in the tank 12), is intended to know the position when it rains and the water in the tank 12 is gradually replaced from the bottom, as will be described later.

[0023] The water that has been subjected to heat exchange is returned to the top of the tank 12, so the temperature of the water in the tank 12 gradually rises from the top to the bottom. When it rains, if the temperature of the rainwater is lower than the water in the tank 12, the water is replaced by the rainwater from the bottom of the tank 12, and when the water temperature of the water thermometer 14β becomes the same as that of the rainwater, this indicates that the water up to the position of the water thermometer 14β has been replaced by rainwater. This can be said to have cooled the water in the tank 12 with the rainwater.

[0024] The tank 12 is provided with pumping pipes 16. The pumping pipes 16 have their inlets 16i located slightly above the position of the water thermometer 14α, which is located at the deepest position. The pumping pipes 16 are provided in the first tank 12A and the second tank 12B, respectively, and are referred to as pumping pipes 16A and 16B. These inlets 16i are also referred to as inlets 16Ai and 16Bi, respectively.

[0025] That is, the water intakes 16Ai and 16Bi are respectively disposed between a position of the water thermometers 14Aα and 14Bα disposed at the deepest parts of the first tank 12A and the second tank 12B and a position slightly above that.

[0026] The pumping pipe 16 is connected to a pumping pump 18. Water is sent from the pumping pump 18 to the indoor heat exchanger 10 through a water supply pipe 20. More specifically, the water supply pipe 20 is connected to the water inlet 10a of the heat exchanger 10.

[0027] A drain pipe 22 is connected to the water outlet 10b of the heat exchanger 10. The drain pipe 22 is connected to a return pipe 24 of the tank 12.

[0028] When there are two tanks 12, a first tank 12A and a second tank 12B, the pumping pipe 16 has two series, a pumping pipe 16A and a pumping pipe 16B. Therefore, a pumping pump 18 and a pumping pipe switcher 40 for switching between the pumping pipe 16A and the pumping pipe 16B are provided. In addition, a return pipe switcher 42 is provided for the drain pipe 22 to switch between the return pipe 24A and the return pipe 24B of each tank 12.

[0029] The outlet 24o of the return pipe 24 is disposed at the top of the tank 12. The water returning to the tank 12 has a higher temperature due to heat exchange indoors, and this is to avoid heat exchange with the cold water in the deeper portions.

[0030] The connection between the drain pipe 22 and the return pipe 24 for each tank 12 is switched by a return pipe switch 42. In the cooling system 1 according to the present invention, the water after heat exchange is returned to the tank 12 from which the water was pumped. Therefore, the pumping pipe switch 40 and the return pipe switch 42 work in conjunction to connect to the pumping pipe 16 and the return pipe 24 of the same tank 12.

[0031] The cooling system 1 according to the present invention is also provided with rainwater supply piping 28 that injects rainwater into each tank 12. The rainwater supply piping 28 is connected to a rainwater collector Rc. The shape of the rainwater collector Rc is not particularly limited. For example, it may be a funnel or a gutter on the roof of the building H. The rainwater supply piping 28 is connected to the rainwater collector Rc and causes the rainwater to flow into the tank 12.

[0032] A rainwater thermometer 26 for measuring the temperature of rainwater is provided. The rainwater thermometer 26 may be provided in the rainwater collector Rc or in the middle of the rainwater supply pipe 28, as long as the temperature of the rainwater can be measured.

[0033] The rainwater supply pipe 28 is also provided with a rainwater supply valve 30 (also referred to as an R valve 30). When the rainwater supply valve 30 is opened, rainwater from the rainwater collector Rc is supplied to each tank 12.

[0034] The outlet 28o of the rainwater supply pipe 28 is provided at a deeper position than the suction port 16i of the pumping pipe 16. This is to replace the water at the bottom of the tank 12 with rainwater. More specifically, in the first tank 12A, the outlet 28Ao of the rainwater supply pipe 28 is disposed below the suction port 16Ai of the pumping pipe 16A, and in the second tank 12B, the outlet 28Bo of the rainwater supply pipe 28 is disposed below the suction port 16Bi of the pumping pipe 16B.

[0035] The tank 12 is preferably provided with an overflow drain pipe D. This is for draining water stored in the tank 12 when it overflows. The overflow drain pipes D may be connected in series to the portions of the tanks 12 (first tank 12A and second tank 12B) near their openings, or may be provided separately.

[0036] The cooling system 1 according to the present invention is also provided with a controller 50. The controller 50 is preferably composed of an MPU (Micro Processor Unit), a memory, and an input / output device. The controller may be composed of multiple MPUs. This is because multiple programs can be run simultaneously.

[0037] The controller 50 is connected to the water thermometer 14 in the tank 12 and the rainwater thermometer 26, and receives the values ​​of each water thermometer 14 from the water thermometer 14 in the tank 12 by notification signal STt, and from the rainwater thermometer 26 by notification signal STr. The temperature values ​​of the water thermometer 14Aα, water thermometer 14Aβ, water thermometer 14Bα, and water thermometer 14Bβ are notified to the controller 50 by notification signal STt1α, notification signal STt1β, notification signal STt2α, and notification signal STt2β, respectively.

[0038] The controller 50 also sends an instruction signal Cp to the pumping pump 18, an instruction signal Cs to the pumping pipe switch 40 and the return pipe switch 42, and an instruction signal Cv to the rainwater supply valve 30 to control their operations. The controller 50 also holds an available tank list 52, which is a list of available tanks.

[0039] <Cooling system operation> Next, the operation of the cooling system 1 according to the present invention will be described. In the following description, "K" is used when the number of the tank 12 is used as a variable. For example, the water temperature measured by the water thermometer 14α at the deepest part of the tank 12 is expressed as TtKα. This indicates that K=1 (Tt1α) is the water temperature measured by the water thermometer 14Aα of the first tank 12A, and K=2 (Tt2α) is the water temperature measured by the water thermometer 14Bα of the second tank 12B.

[0040] 5 shows a process flow of the controller 50. When the cooling system 1 is started (step S100), a termination decision is made (step S102). The termination decision is preferably made manually, such as when the user turns off the system switch. Note that the switch may be turned on and off automatically using a timer (not shown).

[0041] If it is determined that the operation is finished (Y branch in step S102), the cooling system 1 is stopped (step S104). Note that, since the present invention lowers the indoor temperature by circulating the water in the tank, an operation may be added in which the indoor temperature is compared in advance with the temperature Tt of the water in the tank 12, and if the difference is equal to or less than a certain value, the cooling system 1 is not operated or the reason why it cannot be operated is displayed.

[0042] Next, the "rain + tank in use" process is performed (step S106). This process is shown as a separate subroutine in FIG. 6. To briefly explain this process, if it rains and certain conditions are met, the rainwater supply valve 30 in FIG. 1 opens and the rainwater is stored in the tank 12. Also, if there are multiple tanks 12, the tanks that can be used are marked. Marking the tanks that can be used here means checking which tanks can be used at that time and storing them in the available tank list 52.

[0043] Here, an "usable tank" refers to a tank 12 in which the water temperature Ttα (Tt1α or Tt2α) at ​​the bottom of the tank 12 is lower than a predetermined temperature Th1. If the stored water is at this temperature, the room can be cooled appropriately. The predetermined temperature Th1 varies slightly depending on the location where the cooling system 1 is installed, but it is preferably about the average annual temperature. For example, in the Hiroshima region, Th1 corresponds to 22°C to 25°C.

[0044] Therefore, after passing through step S106, if it has rained and the rain is usable (the conditions for this will be explained in detail in FIG. 6), it is introduced into the tank 12, and it is always known which tank number is the usable tank.

[0045] 5 again, it is confirmed whether or not there is a next available tank (step S108). This can be confirmed by looking at the available tank list 52. Then, the available tank and the pump are connected (step S110).

[0046] 2 shows a state in which the first tank 12A is selected and connected to the pumping pump 18 when there are two tanks. The connected pipes are indicated by thick lines. When the first tank 12A is selected, it means that the instruction signal Cs from the controller 50 causes the pumping pipe switch 40 and the return pipe switch 42 to connect the pumping pipe 16A of the first tank 12A to the pumping pump 18, and to connect the drain pipe 22 to the return pipe 24A.

[0047] Referring again to Fig. 5, once the tank switching (step S110) is completed, the pumping pump 18 is turned ON (step S112). As a result, as shown by the bold lines in Fig. 2, the water in the first tank 12A circulates from the bottom of the first tank 12A through the pumping pipe 16A, the pumping pipe switch 40, the pumping pump 18, the water inlet 10a of the heat exchanger 10, the water outlet 10b of the heat exchanger 10, the drain pipe 22, the return pipe switch 42, and the return pipe 24A, thereby cooling the room.

[0048] Referring again to FIG. 5, after the pump is turned on (step S112), the rain + used tank process (step S114) is performed again. Then, it is determined whether the water temperature (TtKα: K=1) measured by the water thermometer 14A provided at the bottom of the first tank 12A is higher than a predetermined temperature Th1 (step S116). The water pumped from the first tank 12A is the water at the bottom of the tank where the water intake 16Ai of the pumping pipe 16A is located. Therefore, if the water temperature TtKα of this part of the water is higher than the predetermined temperature Th1, the cooling effect indoors cannot be obtained, so this determination is made.

[0049] If the water temperature (TtKα) measured by the water thermometer 14Aα is not higher than the predetermined temperature Th1 (N branch in step S116), it is determined that the water in the first tank 12A can still be used, and step S112 is repeated. The reason why the rain + used tank process in step S114 is repeated here is that the process from step S112 to step S116 continues until the water in the first tank 12A is used up, and therefore processing in the case where rain falls during that time is performed here.

[0050] Also, if the water temperature (TtKα: K=1) measured by the water temperature gauge 14Aα becomes higher than the predetermined temperature Th1 (Y branch in step S116), the first tank 12A has already been assigned as an unusable tank in the rain + tank in use process in step S114. In the subsequent processing, the water temperature of the first tank 12A is measured each time the rain + tank in use process (step S106 or step S114) is executed, and the first tank 12A is treated as an unusable tank until the water temperature becomes lower than the predetermined temperature Th1. In other words, if the water temperature of the first tank 12A becomes lower than the predetermined temperature Th1, the first tank 12A is treated as an usable tank. Such a switching of assignment is performed by recording "unusable" or "usable" in the column for the first tank 12A in the usable tank list 52.

[0051] When the water temperature (TtKα) measured by the water temperature gauge 14Aα becomes higher than the predetermined temperature Th1 (Y branch of step S116), the pumping pump 18 is turned off (step S118), and the process returns to the end determination (step S102).

[0052] If the process continues (N branch of step S102), the rain + used tank process (step S106) is performed again to check whether or not there is a used tank (step S108). Here, since the first tank 12A is disabled, the second tank 12B is selected (Y branch of step S108).

[0053] Then, the tank is switched (step S110). Fig. 3 shows a state in which the tank is switched from the first tank 12A to the second tank 12B. The second tank 12B is selected by the instruction signal Cs from the controller 50, which causes the pumping pipe switch 40 and the return pipe switch 42 to connect the pumping pipe 16B of the second tank 12B to the pumping pump 18 and to connect the drain pipe 22 to the return pipe 24B.

[0054] 5 again, once the tank 12 is switched (step S110), the pumping pump 18 is turned ON (step S112). As a result, as shown by the bold line in FIG. 3, the water in the second tank 12B circulates from the bottom of the second tank 12B through the pumping piping 16B, the pumping piping switch 40, the pumping pump 18, the water inlet 10a of the heat exchanger 10, the water outlet 10b of the heat exchanger 10, the drain pipe 22, the return piping switch 42, and the return piping 24B, thereby cooling the building H.

[0055] After the rain + tank in use process (step S114) is performed, it is determined whether the water temperature (TtKα: K=2) measured by the water thermometer 14Bα is higher than the predetermined temperature Th1 (step S116). If the water temperature (TtKα: K=2) measured by the water thermometer 14Bα is not higher than the predetermined temperature Th1 (N branch of step S116), the process repeats from step S112, and if it is higher (Y branch of step S116), the pumping pump 18 is turned off (step S118) and the process returns to the end (step S102).

[0056] <Rain + tank usage process> The process of the Rain + Used Tank process (steps S106 and S114) is shown in Fig. 6. When the Rain + Used Tank process (steps S106 and S114) starts, it is determined whether or not it is raining (step S200). No particular method for this determination is mentioned. Possible methods include providing a water detector to the rainwater collector Rc, or providing water detection capability to the rainwater thermometer 26.

[0057] If it is not raining (N branch of step S200), the process jumps to closing the rainwater supply valve 30 (R valve 30) (step S206). If it is raining (Y branch of step S200), the rainwater temperature Tr is compared with the water temperature TtKα at the bottom of the tank currently being used (step S202). If the rainwater temperature Tr is lower than the water temperature TtKα at the bottom of the tank (Y branch of step S202), the rainwater supply valve 30 (R valve 30) is opened (step S204). Then, the process jumps to step S208.

[0058] That is, this subroutine keeps the rainwater supply valve 30 open unless the rainwater temperature Tr becomes higher than the water temperature TtKα at the bottom of the tank or the rain stops.

[0059] Next, the process proceeds to step S208. Here, n=1 is used to initialize variables. Then, it is determined whether the water temperature Ttnα at the bottom of the nth tank is lower than a predetermined value Th1 (step S210). If it is lower (Y branch of step S210), the nth tank is recorded in the usable tank list 52 as being usable (step S214). If not (N branch of step S210), the nth tank is recorded in the usable tank list 52 as being unusable (step S212).

[0060] Then, it is determined whether or not all tanks have been checked (step S216), and if not (N branch of step S216), n is incremented (step S218) and the process returns to step S210. When checking of all tanks has been completed (Y branch of step S216), the subroutine is exited (step S220).

[0061] Referring again to Fig. 5, the "rain + tank in use process" is executed in steps S106 and S114, and is executed almost without interruption. Therefore, when it is determined that rain has started, the rainwater supply process in Fig. 6 is executed almost without delay.

[0062] Fig. 4 shows a case where it rains when the first tank 12A is selected. If water is being supplied from the first tank 12A to the heat exchanger 10, the "rain + tank in use process" is executed in step S114. Referring also to Fig. 6, if it is determined that it is raining (Y branch in step S200), the temperature Tr of the rainwater is then compared with the bottom water temperature TtKα (K=1) of the first tank 12A (step S202).

[0063] If the temperature of the rainwater is lower than the bottom water temperature TtKα of the first tank 12A, the rainwater supply valve 30 is opened (step S204). At this time, rainwater is also supplied to the bottom of the second tank 12B. This process continues as long as it is raining and the temperature Tr of the rainwater is lower than the bottom water temperature TtKα of the first tank 12A. Since the rainwater is supplied to the bottom of the tank 12, water overflows from the edge of the tank 12, but this is discharged by the overflow drain pipe D.

[0064] As described above, in the cooling system 1 of the present invention, if the rainwater temperature Tr is lower than the bottom water temperature Ttα of the tank 12, rainwater is supplied to the bottom of the tank 12, so that the water warmed by heat exchange at the top of the tank 12 is pushed out and the water in the tank 12 is replaced with cold rainwater.

[0065] For example, in step S210 in Fig. 6, the bottom water temperature Ttnα (bottom water temperature of the nth tank 12) of the tank 12 is compared with the predetermined value Th1, but it may be compared with Ttnβ, which is the water temperature above the bottom. By doing so, it is possible to estimate that the volume of water from the bottom to the water thermometer 14β is usable. [Industrial Applicability]

[0066] INDUSTRIAL APPLICABILITY The present invention can be suitably used as a cooling system that cools a room by using rainwater stored in a tank. [Explanation of symbols]

[0067] 1. Cooling system 10 Heat exchanger 10a Entrance 10b Water outlet 12. Tank 12A First Tank 12B Second Tank 14 Water temperature gauge 14A water temperature gauge 14Aα water temperature gauge 14Aβ water temperature gauge 14B Water temperature gauge 14Bα water temperature gauge 14Bβ water temperature gauge 14α water temperature gauge 14β water temperature gauge 16 Pumping piping 16A Pumping piping 16B Pumping piping 16i water intake 18 Pump 20 Water pipe 22 Drain pipe 24 Return pipe 24o water outlet 26 Rainwater thermometer 28 Rainwater supply piping 28o water outlet 30 Rainwater supply valve 40 Pumping piping switch 42 Return pipe switch 50 Controller 52 Available Tank List H building Rc Rainwater Collector D Overflow drain piping STt notification signal STr notification signal Cp instruction signal Cs instruction signal

Claims

1. A heat exchanger installed in the building; A tank buried underground for storing water; A water temperature gauge disposed at a predetermined position from the bottom of the tank; a pumping pipe for pumping up the water stored in the tank from the bottom of the tank; a pump disposed in the pumping pipe; and A water supply pipe connected from the pump to the water inlet of the heat exchanger; A drain pipe connected to the water outlet of the heat exchanger; a return pipe connected to the drain pipe for returning water to an upper portion of the tank; A rainwater thermometer that detects the temperature of rainwater; A rainwater supply pipe that discharges the rainwater into the tank below a water intake port of the pumping pipe of the tank; A rainwater supply valve provided in the rainwater supply pipe; A geothermal cooling system that cools water in a buried tank with rainwater, the system having a controller that controls the rainwater supply valve to open when the value of the rainwater thermometer is lower than the value of the water thermometer.

2. A plurality of the tanks are provided, The plurality of tanks include: The pumping pipe; The return pipe; The rainwater supply pipe; Each of the water temperature gauges has A pumping pipe switcher that switches the connection between each of the pumping pipes and the pumping pump; A return pipe switch is provided for switching the connection between the drain pipe and each of the return pipes, The controller includes:

2. A geothermal cooling system for cooling water in a buried tank with rainwater as described in claim 1, wherein the pumping pipe switch and the return pipe switch are controlled when the value of the water temperature gauge reaches or exceeds a predetermined value.

3. 3. A geothermal energy cooling system for cooling water in a buried tank with rainwater as described in claim 2, wherein the pumping pipe switch and the return pipe switch are switched so that the pumping pipe and the return pipe of the same tank are connected to the pump and the drain pipe.

4. 3. A geothermal cooling system for cooling water in a buried tank with rainwater as described in claim 2, wherein said controller designates said tank as a usable tank when said water temperature gauge indicates a predetermined value or lower.

5. A geothermal energy cooling system that cools water in a buried tank with rainwater as described in claim 4, wherein the controller switches the pump to another available tank when the value of the water thermometer in the tank connected to the pump-up pump reaches or exceeds a predetermined value.

6. A cooling method in which water stored in a tank buried underground is heat-exchanged indoors, comprising the steps of: The cooling method includes a step of replacing the water stored in the tank from the bottom of the tank if the temperature of the water from the rain is lower than the temperature of the water stored in the tank.

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