Shallow layer and middle-deep layer interactive buried pipe group terrestrial heat utilization system

Abstract

The utility model relates to the field of renewable energy source application, and discloses a shallow layer and middle-deep layer interactive buried pipe group terrestrial heat utilization system which comprises a shallow layer buried pipe heat exchanger, a middle-deep layer buried pipe heat exchanger, a ground source heat pump and a temperature sensor. The shallow-layer buried pipe heat exchanger and the middle-deep-layer buried pipe heat exchanger are respectively connected with the ground source heat pump through water conveying pipes; the ground source heat pump supplies heat to heating users through a water conveying pipe. And the temperature sensor is used for monitoring the operating temperature of the system and the heat utilization time of the shallow-layer buried pipe heat exchanger and the middle-deep-layer buried pipe heat exchanger. The system can meet the requirements for heating in winter and refrigerating in summer at the same time, surplus natural cooling capacity and heat are stored in shallow rock soil according to the heating and refrigerating requirements in winter and summer, and deep heat is recharged into the shallow rock soil through the middle-deep layer buried pipe heat exchanger in the transition season to promote ground temperature recovery. And the stability of the temperature of the shallow rock soil is maintained in a cross-seasonal heat storage mode of deep taking and shallow storage.

Description

Technical Field

[0001] This utility model relates to the field of renewable energy applications, and in particular to a shallow and medium-deep interactive underground pipe network geothermal utilization system. Background Technology

[0002] Under long-term operation, the geothermal utilization system will experience a continuous decline in the temperature of the surrounding soil and rock due to the inability of the geothermal heat flow to replenish the extracted heat in a timely manner, severely affecting the heat extraction performance. Furthermore, for medium-deep buried pipe heat exchangers, where the burial depth is often quite deep (1000 m to 2000 m), the temperature variation of the surrounding soil and rock is significant, with the temperature difference between the shallow and deep layers reaching tens of degrees Celsius.

[0003] In cold and frigid regions, an imbalance between winter and summer temperatures is common. After a heating season, the temperature of the soil and rock surrounding the buried pipe heat exchanger in a shallow ground source heat pump system drops significantly, falling below its initial temperature. During the cooling season, the fluid flowing into the buried pipe heat exchanger is hot water carrying excess indoor heat. This heat is transferred to the surrounding soil and rock through heat exchange, allowing their temperature to recover. However, due to the lower ambient temperature in winter, the heat load during the heating season is typically higher than the cooling load during the cooling season. This results in more heat being extracted from the soil and rock during the heating season than the heat being reinjected during the cooling season, leading to a continued decrease in soil and rock temperature. Under long-term operating conditions, the temperature of the soil and rock surrounding the buried pipe heat exchanger will decrease year by year, causing a gradual reduction in the system's heating efficiency. In severe cases, this can even affect the system's stability and operational performance. Utility Model Content

[0004] To address existing problems, this utility model provides a shallow and medium-deep interactive geothermal utilization system using buried pipe networks. The aim is to design a geothermal utilization system with shallow and medium-deep buried pipe networks. Medium-deep buried pipe heat exchangers are used for winter heating, while shallow buried pipe heat exchangers are used for summer cooling and to supplement winter heating. Simultaneously, by utilizing the heating and cooling needs of winter and summer, cold and heat are stored in the shallow soil and rock layers to achieve cross-seasonal utilization, thereby ensuring the system's stability during long-term operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] A shallow and medium-deep interactive geothermal system using buried pipe networks includes a shallow buried pipe heat exchanger, a medium-deep buried pipe heat exchanger, a ground source heat pump, a first temperature sensor, and a second temperature sensor. The shallow and medium-deep buried pipe heat exchangers are each connected to the ground source heat pump via water pipes. The ground source heat pump provides heating to users through the water pipes. The first temperature sensor is located in the water pipe exiting the medium-deep buried pipe heat exchanger to monitor the temperature of the medium in the water pipe and the timing of heat utilization by the medium-deep buried pipe heat exchanger. The second temperature sensor is located in the water pipe exiting the shallow buried pipe heat exchanger to monitor the temperature of the medium in the water pipe and the timing of heat utilization by the shallow buried pipe heat exchanger. The number of shallow buried pipe heat exchangers is greater than the number of medium-deep buried pipe heat exchangers. The shallow buried pipe heat exchangers are evenly arranged around the medium-deep buried pipe heat exchangers.

[0007] As a further improvement of this utility model, it also includes a hot water storage tank; the hot water storage tank is connected to the shallow buried pipe heat exchanger and the medium-deep buried pipe heat exchanger respectively through water supply pipes; the hot water storage tank is also connected to a ground source heat pump.

[0008] As a further improvement of this utility model, a third temperature sensor is included; the third temperature sensor is installed inside the hot water storage tank.

[0009] As a further improvement of this utility model, the shallow buried pipe heat exchanger is a U-shaped tube buried pipe heat exchanger or a shell-and-tube buried pipe heat exchanger.

[0010] As a further improvement of this utility model, the medium-deep buried pipe heat exchanger is a shell-and-tube type buried pipe heat exchanger.

[0011] As a further improvement of this utility model, it also includes several valves; the first valve is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger and the hot water storage tank; the second valve is installed on the water supply pipe connecting the shallow buried pipe heat exchanger and the hot water storage tank; the third valve is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger and the hot water storage tank; and the fourth valve is installed on the water supply pipe connecting the shallow buried pipe heat exchanger and the hot water storage tank.

[0012] As a further improvement of this utility model, it also includes several circulating water pumps; the first circulating water pump is installed on the water supply pipe of the medium-deep buried pipe heat exchanger and the hot water storage tank; the second circulating water pump is installed on the water supply pipe of the shallow buried pipe heat exchanger and the hot water storage tank.

[0013] This utility model has the following beneficial effects:

[0014] This invention utilizes a combination of shallow and medium-deep buried pipe heat exchangers to fully leverage geothermal resources at different depths, thereby improving the efficiency of geothermal energy utilization and heating effect. Shallow geothermal energy is typically at a lower temperature but is readily available, while medium-deep geothermal energy is at a higher temperature and can provide more stable heating capacity.

[0015] Preferably, the hot water storage tank can store heat energy from shallow and medium-deep buried pipe heat exchangers and release it to the ground source heat pump for heating when needed; this helps to balance the supply and demand of geothermal energy and improve the stability and flexibility of the system.

[0016] Preferably, by monitoring the temperature of the medium flowing out of the deep and shallow geothermal heat exchangers and the hot water storage tank through temperature sensors, the utilization of deep and shallow geothermal energy and the heat reserve of the hot water storage tank can be understood in real time, ensuring the stable operation of the heating system; at the same time, it also provides data support for the optimization and adjustment of the system.

[0017] Preferably, U-tube or coaxial buried pipe heat exchangers have the advantages of compact structure and high heat exchange efficiency, and are suitable for geothermal energy extraction at different depths and geological conditions; selecting a suitable heat exchanger type can further improve the heat exchange efficiency and stability of the system.

[0018] Preferably, by increasing the number of shallow geothermal pipe heat exchangers, more shallow geothermal energy can be utilized, reducing dependence on medium-deep geothermal energy. At the same time, the shallow geothermal pipe heat exchangers are evenly arranged around the medium-deep geothermal pipe heat exchangers, which helps to achieve uniform distribution and efficient utilization of geothermal energy.

[0019] Preferably, the circulating water pump can accelerate the water flow rate and improve the heat exchange efficiency. The circulation water pumps installed on the water supply pipes between the medium-deep buried pipe heat exchanger and the hot water storage tank, and between the shallow buried pipe heat exchanger and the hot water storage tank, can ensure smooth water flow and sufficient heat exchange, thereby improving the efficiency and stability of the entire heating system. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0021] Figure 1 This is a schematic diagram of a shallow and medium-deep interactive buried pipe network geothermal utilization system as described in Example 1;

[0022] Figure 2 This is a schematic diagram of the longitudinal section of the buried pipe heat exchanger of a shallow and medium-deep interactive buried pipe group geothermal utilization system as described in Example 1.

[0023] Figure 3 This is a top view schematic diagram of the buried pipe heat exchanger of a shallow and medium-deep interactive buried pipe group geothermal utilization system as described in Example 1;

[0024] The components include: 1. Shallow buried pipe heat exchanger; 2. Medium-deep buried pipe heat exchanger; 3. Hot water storage tank; 4. Ground source heat pump; 5. Heating / cooling users; 6. Display device; 7. Second temperature sensor; 8. Second temperature sensor; 9. First temperature sensor; 10. Second temperature sensor; 11. Second temperature sensor; 12. Fourth valve; 13. Fourth valve; 14. Third valve; 15. Fourth valve; 16. Fourth valve; 17. Second circulating water pump; 18. Second valve; 19. First circulating water pump; 20. First valve; 21. Third temperature sensor; 22. Third circulating water pump; 23. Fourth circulating water pump; 24. Soil and rock; 201. Inner pipe of medium-deep buried pipe heat exchanger; 202. Outer pipe of medium-deep buried pipe heat exchanger; 203. Outer pipe wall of medium-deep buried pipe heat exchanger. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Example 1

[0029] like Figure 1 The system illustrates a shallow and medium-deep interactive geothermal system using buried pipe networks, comprising a shallow buried pipe heat exchanger 1, a medium-deep buried pipe heat exchanger 2, a ground source heat pump 4, a hot water storage tank 3, and a temperature sensor. The shallow buried pipe heat exchanger 1 and the medium-deep buried pipe heat exchanger 2 are respectively connected to the ground source heat pump 4 via water pipes. The ground source heat pump 4 provides heating to users via the water pipes. The temperature sensor is used to monitor the system's operating temperature and the two heat utilization times of the heat exchangers.

[0030] The shallow buried pipe heat exchanger 1 is a U-tube type buried pipe heat exchanger or a shell-and-tube type buried pipe heat exchanger; the depth of the shallow buried pipe heat exchanger 1 is in the range of 50 to 250 m.

[0031] The medium-deep buried pipe heat exchanger 2 is a shell-and-tube type buried pipe heat exchanger; the depth of the medium-deep buried pipe heat exchanger 2 is in the range of 2000-3000 m.

[0032] This invention discloses a geothermal utilization system with shallow and medium-deep interactive buried pipe groups suitable for cold and frigid regions, thereby simultaneously meeting the needs of winter heating and summer cooling, and utilizing the heating and cooling needs in winter and summer to store the surplus natural cold and heat in the shallow rock and soil 24 to promote the recovery of ground temperature.

[0033] In cold and frigid regions, an imbalance between winter and summer temperatures is common. After a heating season, the temperature of the soil and rock surrounding the buried pipe heat exchanger in a shallow ground source heat pump system 4 will significantly decrease, falling below its initial temperature. During the cooling season, the fluid flowing into the buried pipe heat exchanger is hot water carrying excess indoor heat. This heat is transferred to the surrounding soil and rock 24 through heat exchange, allowing its temperature to recover. However, due to the lower ambient temperature in winter, the heat load during the heating season is usually higher than the cooling load during the cooling season. This results in more heat being extracted from the soil and rock 24 during the heating season than the heat being reinjected during the cooling season, causing the soil and rock 24 temperature to continue to decline. Under long-term operating conditions, the temperature of the soil and rock 24 surrounding the buried pipe heat exchanger will decrease year by year, leading to a gradual decrease in the system's heating efficiency. In severe cases, this may even affect the system's stability and operational performance.

[0034] Therefore, the shallow and medium-deep buried pipe geothermal utilization system designed in this invention uses the shallow buried pipe group to bear the cooling load during the cooling season, and the shallow and medium-deep buried pipe groups together to bear the heating load during the heating season. Furthermore, during the transitional season, the medium-deep buried pipe heat exchanger 2 is used to reinject deep heat back to the shallow soil and rock 24 to promote ground temperature recovery, achieving a cross-seasonal "deep extraction, shallow storage" heat storage method, thereby maintaining the stability of the temperature of the shallow soil and rock 24.

[0035] like Figure 2 and Figure 3As shown, the number of shallow buried pipe heat exchangers 1 is greater than the number of medium-deep buried pipe heat exchangers 2; the shallow buried pipe heat exchangers 1 are evenly distributed around the medium-deep buried pipe heat exchangers 2 in a radial pattern. This distribution pattern can maximize the pipe spacing between adjacent buried pipe heat exchangers within a limited space, avoiding large-scale overlap of their thermal radii, which would affect the heat extraction efficiency of a single pipe. Figure 2 In the medium-deep buried pipe heat exchanger 2, the inner tube is located inside the outer tube. The medium in the inner tube flows towards the depth of the ground, while the medium in the outer tube flows towards the surface. The outer tube is placed inside the outer wall of the medium-deep buried pipe heat exchanger 2. The length, surface area, and thermal conductivity of the outer wall of the medium-deep buried pipe heat exchanger 2 ensure heat exchange between the heat exchanger and the soil 24.

[0036] like Figure 1 As shown, the hot water storage tank 3 is connected to the shallow underground pipe heat exchanger 1 and the medium-deep underground pipe heat exchanger 2 via water supply pipes; the hot water storage tank 3 is also connected to the ground source heat pump 4.

[0037] First temperature sensor 9; The first temperature sensor 9 is installed in the water supply pipe flowing out of the medium-deep buried pipe heat exchanger 2, and is used to monitor the temperature of the medium in the medium-deep buried pipe heat exchanger 2 in order to determine the operating status of the medium-deep buried pipe heat exchanger.

[0038] The second temperature sensors 7, 8, 10 and 11 are installed in the water supply pipe of the shallow buried pipe heat exchanger 1 to monitor the temperature of the medium flowing out of the shallow buried heat exchanger in order to determine the operating status of the shallow buried heat exchanger.

[0039] The third temperature sensor 21 is installed inside the hot water storage tank 3 to monitor the temperature of the medium in the hot water storage tank 3 in order to determine whether the temperature is suitable for heating users.

[0040] The first temperature sensor 9, the second temperature sensors 7, 8, 10 and 11, and the third temperature sensor 21 transmit the collected temperature data to the display device 6 so that staff can monitor the data in real time.

[0041] The medium-deep buried pipe heat exchanger 2 is fed into the water inlet on the hot water storage tank 3 via a water supply pipe; the shallow buried pipe heat exchanger 1 is fed into the water inlet on the hot water storage tank 3 via a water supply pipe. The water outlet on the hot water storage tank 3 is fed back into the medium-deep buried pipe heat exchanger 2 and the shallow buried pipe heat exchanger 1 via water supply pipes.

[0042] The first valve 20 is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger 2 and the hot water storage tank 3, and is used to open and close and control the inlet water flow of the medium in the medium-deep buried pipe; the second valve 18 is installed on the water supply pipe connecting the shallow buried pipe heat exchanger 1 and the hot water storage tank 3, and is used to open and close and control the outlet water flow of the medium in the shallow buried pipe; the third valve 14 is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger 2 and the hot water storage tank 3, and is used to open and close and control the inlet water flow of the medium in the medium-deep buried pipe; the fourth valves 12, 13, 15 and 16 are installed on the water supply pipe connecting the shallow buried pipe heat exchanger 1 and the hot water storage tank 3, and are used to open and close and control the inlet water flow of the medium in the shallow buried pipe.

[0043] like Figure 1 As shown, the first circulating water pump 19 and the first valve 20 are connected in series and then in parallel with a heating valve; the second circulating water pump 17 and the second valve 18 are connected in series and then in parallel with a heating valve. The first circulating water pump 19 and the second circulating water pump 17 are used to provide additional reverse circulation power for the system's medium reinjection.

[0044] like Figure 1 As shown, a third circulating water pump 22 is also installed on the water supply pipe connecting the hot water storage tank 3 to the ground source heat pump 4, which provides additional circulating power for the system medium to flow between the hot water storage tank 3 and the ground source heat pump 4. A fourth circulating water pump 23 is also installed on the water supply pipe connecting the heating user to the ground source heat pump 4, which provides additional circulating power for the system medium to provide heating.

[0045] The operating principle of this embodiment is as follows:

[0046] When facing the heating load during the heating season in cold and frigid regions, the heating valves connected to the medium-deep buried pipe heat exchanger 2 and the ground source heat pump 4 are opened to utilize the geothermal energy extracted by the medium-deep buried pipe heat exchanger 2 at a depth of 2000-3000 m to provide heating to users; at the same time, the heating valves connected to the shallow buried pipe heat exchanger 1 are opened to utilize the natural heat extracted by the shallow buried pipe heat exchanger 1 at a depth of 50-250 m to assist in providing heating to users.

[0047] During the heating season, geothermal energy at a depth of 2000-3000 m is extracted using the medium-deep buried pipe heat exchanger 2. Only the heating valve and ground source heat pump 4 connected to the medium-deep buried pipe heat exchanger 2 are opened to provide heating to users.

[0048] During the transitional season, when the water is reinjected, the second circulating water pump 17 and the second valve 18 are turned on to reinject the heated medium from the hot water storage tank 3 into the shallow buried pipe heat exchanger 1 to circulate and release heat. If the second temperature sensor 7, 8, 10 or 11 detects that the temperature flowing out of the shallow buried pipe heat exchanger 1 remains low, the first circulating water pump 19 and the first valve 20 can be turned on to reinject the heated medium from the medium-deep buried pipe heat exchanger 2 into the shallow buried pipe heat exchanger 1 to circulate and release heat, thus compensating for the insufficient temperature recovery of the shallow buried pipe heat exchanger 1.

[0049] The single-well heat extraction and heat extraction efficiency of the medium-deep buried pipe heat exchanger 2 are significantly higher than those of the shallow buried pipe heat exchanger 1. Introducing the medium-deep buried pipe heat exchanger 2 into the shallow buried pipe group can greatly reduce the number of shallow buried pipe heat exchangers 1 required, thereby significantly reducing the system's footprint.

[0050] As can be seen from the above operating principle, during the heating season, by simultaneously opening the valves of the shallow buried pipe heat exchanger 1 and the medium-deep buried pipe heat exchanger 2 branches, as well as the first circulating water pump 19 and the second circulating water pump 17, cold water from the user side flows into the buried pipe group system, utilizing both shallow and medium-deep geothermal energy to heat the building. After a heating season of operation, the temperature of the soil and rock 24 surrounding the buried pipe heat exchanger decreases, forming a "cold zone" around the heat exchanger, which is equivalent to storing the natural cold energy of winter in the soil and rock 24. The temperature field within this "cold zone" increases with the distance from the corresponding buried pipe heat exchanger. When cooling is needed in summer, the shallow buried pipe heat exchanger 1 utilizes geothermal energy within a depth range of 50-250 m, and only the second valve 18 is opened to supply cooling to the user; the first valve 20 is not required. During the cooling season, the shallow buried pipes extract cooling energy from the shallow constant-temperature layer of soil and rock 24 and supply it to users, compensating for the inherent deficiency of the medium-deep geothermal utilization system in providing summer cooling, thus enabling the system to provide energy in all seasons. During the cooling season, if more heat is needed, the heating valves of the two branches of the medium-deep buried pipe heat exchanger, as well as the first circulating water pump 19 and the second circulating water pump 17, can be closed. Hot water from the user side will flow only into the shallow buried pipe group, reinjecting the natural summer heat it carries back to the shallow soil and rock 24, forming a "hot zone" around the heat exchanger.

[0051] To address the issue of the imbalance between the "hot zone" generated during the cooling season and the "cold zone" generated during the heating season, this invention employs a method of reinjecting some of the heat from the medium-deep geothermal energy or the heat from the hot water storage tank 3 into the shallow soil and rock 24 during the transitional season. During the transitional season, hot water from the medium-deep buried pipe heat exchanger 2 flows into the hot water storage tank 3 for heat storage, and hot water is reinjected into the shallow buried pipe heat exchanger 1, achieving a cross-seasonal "deep extraction, shallow storage" heat storage method. This effectively alleviates the ground temperature decline caused by the "heat imbalance" between winter and summer.

[0052] The aforementioned methods of storing cold and heat across seasons can effectively mitigate ground temperature changes caused by long-term system operation, effectively improve system stability, maintain constant ground temperature, ensure heat exchanger efficiency, and reduce heat pump energy consumption.

[0053] The burial depth of shallow and medium-deep buried pipe heat exchangers can be adjusted to a greater extent according to heating needs and cost factors of technology. For example, the depth of medium-deep buried pipe heat exchangers can even reach below 3,000 meters.

[0054] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A shallow and medium-deep interactive buried pipe network geothermal utilization system, characterized in that, The system includes a shallow buried pipe heat exchanger (1), a medium-deep buried pipe heat exchanger (2), a ground source heat pump (4), a first temperature sensor (9), and a second temperature sensor (7). The shallow buried pipe heat exchanger (1) and the medium-deep buried pipe heat exchanger (2) are respectively connected to the ground source heat pump (4) through water pipes. The ground source heat pump (4) provides heating to heating users (5) through the water pipes. The first temperature sensor (9) is installed in the water pipe flowing out of the medium-deep buried pipe heat exchanger (2) for monitoring. The temperature of the medium in the water supply pipe and the timing of heat utilization of the medium-deep buried pipe heat exchanger (2); a second temperature sensor (7) is installed in the water supply pipe flowing out of the shallow buried pipe heat exchanger (1) to monitor the temperature of the medium in the water supply pipe and the timing of heat utilization of the shallow buried pipe heat exchanger (1); the number of shallow buried pipe heat exchangers (1) is greater than the number of medium-deep buried pipe heat exchangers (2); the shallow buried pipe heat exchangers (1) are evenly arranged around the medium-deep buried pipe heat exchanger (2).

2. The shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 1, characterized in that, It also includes a hot water storage tank (3); the hot water storage tank (3) is connected to the shallow underground pipe heat exchanger (1) and the medium-deep underground pipe heat exchanger (2) respectively through water supply pipes; the hot water storage tank (3) is also connected to a ground source heat pump (4).

3. A shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 2, characterized in that, Includes a third temperature sensor (21); the third temperature sensor (21) is installed inside the hot water storage tank (3).

4. A shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 1, characterized in that, The shallow buried pipe heat exchanger (1) is a U-tube buried pipe heat exchanger or a shell-and-tube buried pipe heat exchanger.

5. A shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 1, characterized in that, The medium-deep underground pipe heat exchanger (2) is a shell-and-tube underground pipe heat exchanger.

6. A shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 1, characterized in that, It also includes several valves; the first valve (20) is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger (2) and the hot water storage tank (3); the second valve (18) is installed on the water supply pipe connecting the shallow buried pipe heat exchanger (1) and the hot water storage tank (3); the third valve (14) is installed on the water supply pipe connecting the medium-deep buried pipe heat exchanger (2) and the hot water storage tank (3); and the fourth valve (12) is installed on the water supply pipe connecting the shallow buried pipe heat exchanger (1) and the hot water storage tank (3).

7. A shallow and medium-deep interactive buried pipe network geothermal utilization system according to claim 6, characterized in that, It also includes several circulating water pumps; the first circulating water pump (19) is installed on the water supply pipe of the medium-deep buried pipe heat exchanger (2) and the hot water storage tank (3); the second circulating water pump (17) is installed on the water supply pipe of the shallow buried pipe heat exchanger (1) and the hot water storage tank (3).

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