Depth and depth coupling geothermal buried pipe building energy supply system and method

Abstract

The invention discloses a deep and shallow coupling geothermal buried pipe building energy supply system and method, and belongs to the technical field of geothermal energy supply. Water outlets of medium-deep layer buried pipes of a first buried pipe group and a second buried pipe group of the system are connected with a main water supply pipeline, and water inlets of the medium-deep layer buried pipes of the first buried pipe group and the second buried pipe group are connected with a main water return pipeline; a water inlet of the shallow buried pipe is connected with the main water return pipeline, and a water outlet is connected with the main water supply pipeline; a water inlet of a shallow buried pipe of the first buried pipe group is connected with a main water return pipeline, and a water outlet of the shallow buried pipe of the first buried pipe group is communicated with a water inlet of a middle-deep buried pipe of the second buried pipe group; and water outlets of the middle-deep layer buried pipes of the first buried pipe group and the second buried pipe group are communicated with water inlets of the shallow layer buried pipes, so that outlet water of the middle-deep layer buried pipes passes through the shallow layer buried pipes and then enters a water supply main pipe. And the cooling / heating capacity of the shallow buried pipe system is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal energy supply, and particularly relates to a deep and shallow coupled geothermal buried pipe building energy supply system. Background Art

[0002] In the northern regions, for heating in winter and cooling in summer, the geothermal buried pipe technology is the core method for utilizing shallow geothermal energy. It mainly conducts heat exchange with soil, groundwater or rocks through pipes buried underground. In winter, the system absorbs heat from the soil through the buried pipes, and after raising the temperature, transports the heat to the interior of the building for heating. In summer, the system discharges the heat inside the building into the soil through the buried pipes to achieve the cooling effect. However, the traditional shallow buried pipes are prone to the problem of annual heat and cold imbalance. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems in the prior art, and provide a deep and shallow coupled geothermal buried pipe building energy supply system, which improves the problem of annual heat and cold imbalance prone to occur in traditional shallow buried pipes, and greatly improves the cooling / heating capacity of the shallow buried pipe system.

[0004] The deep and shallow coupled geothermal buried pipe building energy supply system of the present invention includes a first buried pipe group and a second buried pipe group, that is Figure 1 the pipe group in the left area and the pipe group in the right area. Both the first buried pipe group and the second buried pipe group include shallow buried pipes and medium-deep buried pipes. The water outlet of the medium-deep buried pipe is connected to the total water supply pipeline, and the water inlet and the total return water pipeline are connected by pipelines; so that the return water in the total return water pipeline exchanges heat with geothermal energy through the medium-deep buried pipe and is used for building-side energy supply through the total water supply pipeline; The water inlet of the shallow buried pipe is connected to the total return water pipeline by pipelines, and the water outlet is connected to the total water supply pipeline; it is used to make the return water in the total return water pipeline exchange heat with geothermal energy through the shallow buried pipe and is used for building-side energy supply through the total water supply pipeline; The water inlet of the shallow buried pipe of the first buried pipe group is connected to the total return water pipeline, and the water outlet of the shallow buried pipe of the first buried pipe group is communicated with the water inlet of the medium-deep buried pipe of the second buried pipe group, so that the return water in the total return water pipeline enters the medium-deep buried pipe of the second buried pipe group through the shallow buried pipe of the first buried pipe group; The water outlets of the medium-deep buried pipes of the first buried pipe group and the second buried pipe group are both communicated with the water inlets of the shallow buried pipes, so that the water discharged from the medium-deep buried pipes enters the main water supply pipe after passing through the shallow buried pipes.

[0005] Preferably, valves are provided on the total water supply pipeline, the total return water pipeline, each of the shallow buried pipes, each of the medium-deep buried pipes, and the connecting pipelines between each shallow buried pipe and the medium-deep buried pipe.

[0006] Preferably, temperature detection units are provided at the total return water pipeline, the total water supply pipeline, each shallow buried pipe water outlet, and each outlet of the medium and deep buried pipes.

[0007] Preferably, there are multiple shallow buried pipes, and the total return water pipeline is connected to the inlets and outlets of each shallow buried pipe in sequence through pipelines, so that the return water of the total return water pipeline enters each shallow buried pipe in sequence.

[0008] The present invention also discloses a method for supplying energy by the above-mentioned deep and shallow coupled geothermal buried pipe building energy supply system. In the winter heating condition, the medium and deep buried pipes bear the basic heat load of the building. One of the medium and deep buried pipes in the first buried pipe group or the second buried pipe group is selectively opened, and the supply water temperature and return water temperature of the medium and deep buried pipes are monitored. When the monitored return water temperature drops to 10 degrees Celsius, it indicates that the heat load on the building side is large; as the heat load increases, the medium and deep buried pipes in the first buried pipe group and the second buried pipe group are used for combined heating, and the supply water temperature and return water temperature of the medium and deep buried pipes are continuously monitored. When the heat load on the building side further increases and the medium and deep buried pipes in the first buried pipe group and the second buried pipe group cannot meet the requirements, the shallow buried pipe group of the operating buried pipe group is then opened, and the shallow pipe group of the other buried pipe group plays a peak shaving role; At the end of the heating period, the cooling load on the building side decreases, and the heat supply amounts borne by the first buried pipe group and the second buried pipe group are dynamically adjusted. The shallow buried pipes of one of the buried pipe groups are preferentially opened. When the return water temperature of the shallow buried pipes on the operating side is too low, the medium and deep buried pipes of the other buried pipe group are opened for heating.

[0009] Preferably, when the heat load reaches 50%, the return water is preferentially preheated through the shallow buried pipes on one side and then flows to the medium and deep buried pipes on the other side.

[0010] Preferably, at the beginning of the heating season, the outlet of the medium and deep buried pipes on one side is connected to the inlet of the shallow buried pipes on the other side, so that the high-temperature water outlet after heat exchange through the medium and deep buried pipes is cooled through the shallow buried pipes.

[0011] Preferably, in the summer condition, the shallow buried pipes of one of the first buried pipe group or the second buried pipe group are selectively opened, and the supply water temperature and return water temperature of the medium and deep buried pipes are monitored. When the monitored return water temperature exceeds 30 degrees Celsius, it indicates that the cooling load on the building side is large; as the cooling load increases, the shallow buried pipes of the first buried pipe group and the second buried pipe group are used for combined cooling.

[0012] Preferably, the priorities of the first buried pipe group and the second buried pipe group are swapped in the next year.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts a deep and shallow coupling mode, which can dynamically schedule the energy conversion between the two and maximize the utilization of geothermal resources. The present invention makes full use of the heat extraction characteristics of shallow and medium-deep buried pipe heat exchangers. The heat extraction characteristics of the medium-deep buried pipe heat exchanger are used to heat the shallow rock and soil, so as to improve the utilization ability of shallow geothermal energy; the heat accumulation characteristics of the shallow buried pipe heat exchanger in the summer refrigeration condition are used to preheat the fluid temperature flowing into the medium-deep buried pipe heat exchanger, reducing the attenuation of medium-deep geothermal energy. The operation mode of the shallow pipe group in different seasons and regions is adopted to realize the cross-regional migration of shallow soil energy. And through the operation mode of different regions, the problem of annual cold and heat imbalance that is prone to occur in traditional shallow buried pipes does not need to be considered, and the cooling / heating capacity of the shallow buried pipe system is greatly improved. Brief Description of the Drawings

[0014] Figure 1 This is the deep and shallow coupling geothermal buried pipe building energy supply system according to the embodiment of the present invention.

[0015] Figure 2 This is the separate heating of the medium-deep buried pipes in the right region according to the embodiment of the present invention.

[0016] Figure 3 This is the separate heating of the shallow buried pipes in the left region according to the embodiment of the present invention.

[0017] Figure 4 This is the combined heating of the shallow buried pipes in the left region and the medium-deep buried pipes in the right region according to the embodiment of the present invention.

[0018] Figure 5 This is the combined heating of the medium-deep buried pipes in two regions according to the embodiment of the present invention.

[0019] Figure 6 This is the combined heating / cooling of the shallow buried pipe groups in two regions according to the embodiment of the present invention.

[0020] Figure 7 This is the heat supply condition where the return water is preheated by the shallow buried pipes first and then heated by the medium-deep geothermal energy according to the embodiment of the present invention.

[0021] Figure 8 This is the heat supply where the medium-deep buried pipes are cooled by the shallow buried pipes first and then heated according to the embodiment of the present invention.

[0022] Description of the Reference Numerals: 1. Medium-deep buried pipe; 2. Shallow buried pipe; 3. Temperature detection unit; 4. Valve. Detailed Embodiment

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0024] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second", and similar terms used in the present invention do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0025] The deep and shallow coupled geothermal ground heat exchanger building energy supply system of this embodiment includes: a first ground heat exchanger group and a second ground heat exchanger group. Both the first ground heat exchanger group and the second ground heat exchanger group include shallow ground heat exchangers 2 and medium-deep ground heat exchangers 1. The outlet of the medium-deep ground heat exchanger 1 is connected to the main water supply pipeline, and the inlet is connected to the main return water pipeline; so that the return water in the main return water pipeline exchanges heat with geothermal energy through the medium-deep ground heat exchanger 1 and is used for building-side energy supply through the main water supply pipeline; The inlet of the shallow ground heat exchanger 2 is connected to the main return water pipeline, and the outlet is connected to the main water supply pipeline; it is used to make the return water in the main return water pipeline exchange heat with geothermal energy through the shallow ground heat exchanger 2 and be used for building-side energy supply through the main water supply pipeline; The inlet of the shallow ground heat exchanger 2 of the first ground heat exchanger group is connected to the main return water pipeline, and the outlet of the shallow ground heat exchanger 2 of the first ground heat exchanger group is communicated with the inlet of the medium-deep ground heat exchanger 1 of the second ground heat exchanger group, so that the return water in the main return water pipeline enters the medium-deep ground heat exchanger 1 of the second ground heat exchanger group through the shallow ground heat exchanger 2 of the first ground heat exchanger group; The outlets of the medium-deep ground heat exchangers 1 of the first ground heat exchanger group and the second ground heat exchanger group are both communicated with the inlets of the shallow ground heat exchangers 2, so that the water discharged from the medium-deep ground heat exchanger 1 enters the main water supply pipeline after passing through the shallow ground heat exchanger 2.

[0026] During the heat exchange process between the medium in the middle and deep buried pipe 1 heat exchanger and the rock formation in this embodiment, since the ground temperature of the shallow soil part is relatively low, the high-temperature water in the middle and deep buried pipe 1 will heat the shallow soil when passing through the shallow rock and soil area, and this heat is usually wasted. In this embodiment, a shallow buried pipe group is laid around the middle and deep buried pipe 1 heat exchanger to utilize this part of the heat, so as to fully realize the efficient utilization of geothermal energy. At the same time, through the staggered operation of the shallow pipe group, combined with the heat extraction characteristics of the middle and deep geothermal energy, the problem of cold and heat imbalance of the shallow pipe group is solved by the geothermal energy of different temperatures.

[0027] During the heat extraction process of the middle and deep buried pipe 1 in this embodiment, the heat of the deep rock and soil will be brought to the shallow part, heating the shallow soil. By combining the heat extraction characteristics of the middle and deep buried pipe 1 with the characteristics that the shallow buried pipe 2 can utilize the shallow soil part, the coordinated operation of the two is realized, and the rock and soil energy from shallow to deep is utilized and recovered to the maximum extent.

[0028] In this embodiment, the shallow buried pipe group is separated into two areas, and the shallow pipe group operates in different seasons and regions, realizing the cross-regional migration of the shallow soil energy. And through the operation mode of different regions, the problem of cold and heat imbalance in the traditional shallow buried pipe 2 throughout the year does not need to be considered, and the cooling / heating capacity of the shallow buried pipe 2 system is greatly improved.

[0029] In this embodiment, the shallow pipe group is used to cool the too high outlet water temperature of the middle and deep buried pipe 1 at the beginning of the heating season, and realize the migration of the heat of the deep rock and soil to the shallow area rock and soil for storage, reducing the overheat warning failure of the ground source heat pump; and preheating the inlet water temperature of the middle and deep buried pipe 1, increasing the utilization efficiency of geothermal energy, and alleviating the attenuation of deep geothermal energy.

[0030] Preferably, valves 4 are provided on the total water supply pipeline, the total water return pipeline, each of the shallow buried pipes 2, each of the middle and deep buried pipes 1, and the connecting pipelines between each of the shallow buried pipes 2 and the middle and deep buried pipes 1.

[0031] Preferably, temperature detection units 3 are provided at the total water return pipeline, the total water supply pipeline, the outlets of each of the shallow buried pipes 2, and the outlets of each of the middle and deep buried pipes 1.

[0032] Preferably, there are multiple shallow buried pipes 2, and the total water return pipeline is connected to the inlets and outlets of each of the shallow buried pipes 2 in sequence through pipelines, so that the return water of the total water return pipeline enters each of the shallow buried pipes 2 in sequence.

[0033] The present embodiment also discloses a method for supplying energy to the above-mentioned deep-shallow coupled geothermal buried pipe building energy supply system. In winter heating conditions, the medium-deep buried pipe 1 bears the basic heat load of the building, and the medium-deep buried pipe 1 of the first buried pipe group or the second buried pipe group is selected to be opened, and the water supply temperature and return water temperature of the medium-deep buried pipe 1 are monitored. When the monitored return water temperature drops to 10 degrees Celsius, it indicates that the heat load on the building side is large; as the heat load increases, the medium-deep buried pipe 1 of the first buried pipe group and the second buried pipe group is combined for heating, and the water supply temperature and return water temperature of the medium-deep buried pipe 1 are continuously monitored. When the heat load on the building side is further increased and the medium-deep buried pipe 1 of the first buried pipe group and the second buried pipe group cannot meet the requirements, the shallow buried pipe group of the buried pipe group is opened, and the shallow pipe group of the other buried pipe group plays a peak-shaving role. At the end of the heating period, the cooling load on the building side decreases, and the heating capacity of the first and second buried pipe groups is dynamically adjusted. The shallow buried pipes 2 of one of the buried pipe groups are opened first. When the return water temperature of the shallow buried pipes 2 on the operating side is too low, the medium and deep buried pipes 1 of the other buried pipe group are opened for heating.

[0034] Preferably, when the heat load reaches 50%, the return water is preferentially preheated through the shallow buried pipe 2 on one side, and then flows to the medium-deep buried pipe 1 on the other side.

[0035] Preferably, at the beginning of the heating season, the outlet of the medium-deep buried pipe 1 on one side is connected to the inlet of the shallow buried pipe 2 on the other side, so that the high-temperature outlet water after heat exchange in the medium-deep buried pipe 1 can be cooled through the shallow buried pipe 2.

[0036] Preferably, in summer working conditions, one of the shallow buried pipes 2 of the first buried pipe group or the second buried pipe group is opened, and the water supply temperature and return water temperature of the medium and deep buried pipes 1 are monitored. When the monitored return water temperature exceeds 30 degrees Celsius, it indicates that the cooling load on the building side is large. As the cooling load increases, the shallow buried pipes 2 of the first buried pipe group and the second buried pipe group are used to jointly supply cooling.

[0037] Preferably, the priorities of the first buried pipe group and the second buried pipe group are swapped in the next year.

[0038] Figures 2 - 5 Schematic diagram of different types of underground pipe systems for heating. Shallow underground pipe 2, medium-deep underground pipe 1, and the combination of the two for heating. Shallow underground pipe 2 can also bear the cooling load in cold areas in summer. Throughout the year, the underground pipe groups in the left and right areas are staggered, one area is mainly for heating, and the other area is mainly for cooling.

[0039] In the winter heating mode, the medium-deep buried pipe 1 undertakes the basic heat load of the building. As shown in Figure 2, the medium-deep buried pipe 1 on one side is preferentially turned on, and the thermometer monitors the supply and return water temperatures of the buried pipe. When the monitored return water temperature drops to 10 degrees Celsius, it indicates that the heat load on the building side is large.

[0040] As the load increases, as Figure 4 shown, the medium-deep buried pipes 1 in both side areas jointly continue to supply heat, and the thermometer monitors the supply and return water temperatures of the medium-deep buried pipe 1 in the left area.

[0041] When the heat load on the building side further increases and the medium-deep buried pipes 1 on both sides cannot meet the requirements, the shallow buried pipe group in this area is then turned on, and the shallow pipe group in the other area plays a peak-shaving role.

[0042] At the end of the heating period, the cooling load on the building side decreases. As Figure 4 shown, the heat supply amount borne by the buried pipes on both sides is dynamically adjusted. The shallow buried pipe group on the left is preferentially turned on. When the return water temperature of the shallow buried pipe group on the left is too low, the medium-deep buried pipe 1 on the right is turned on for heating. The purpose is to reduce the soil temperature of the shallow buried pipe group on the left and improve the cooling capacity of the left area in preparation for summer.

[0043] In the summer cooling mode, as Figure 3 shown, the shallow pipe group in the other area is preferentially turned on for cooling. The thermometer monitors the supply and return water temperatures of the buried pipe. When the monitored supply water temperature exceeds 30 degrees Celsius, it indicates that the cooling load on the building side is large.

[0044] As the cooling load increases, as Figure 6 shown, the shallow pipe group on the other side is continuously turned on for combined cooling.

[0045] The priorities of the two areas are swapped in the next year to ensure the long-term stable operation of the system. The purpose of this operation strategy is as follows: During the heat exchange process between the medium in the heat exchanger of the medium-deep buried pipe 1 and the rock formation, since the ground temperature of part of the shallow soil is relatively low, the high-temperature water in the medium-deep buried pipe 1 will heat the shallow soil when passing through the shallow rock and soil area, and this heat is usually wasted. In this patent, a shallow buried pipe group is laid around the heat exchanger of the medium-deep buried pipe 1 to utilize this part of the heat, fully realizing the efficient utilization of geothermal energy. At the same time, through the staggered operation of the shallow pipe group, combined with the heat extraction characteristics of the medium-deep geothermal energy, the problem of cold and heat imbalance of the shallow pipe group is solved by the geothermal energy of different temperatures.

[0046] Figure 7It is a working condition diagram of medium-deep geothermal heating (preheating the inlet water temperature of the medium-deep buried pipe 1 through the shallow buried pipe 2). When the heat load is 50%, the return water at the end first passes through the shallow buried pipe group on the right for preheating, and then flows to the medium-deep buried pipe 1 on the left. On the one hand, it increases the inlet temperature of the medium-deep buried pipe 1, its outlet temperature increases, and the COP of the heat pump unit increases; on the other hand, part of the heat load accumulated in the shallow buried pipe group on the right is transferred to the shallow position of the rock and soil on the left through the medium-deep buried pipe 1, realizing the energy transfer between the two shallow pipe groups; at the same time, the higher inlet temperature can further delay the attenuation process of deep geothermal energy.

[0047] Figure 8 It is a working condition diagram of medium-deep geothermal heating (pre-cooling the outlet water temperature of the medium-deep buried pipe 1 through the shallow buried pipe 2). The length of the heat exchanger of the medium-deep buried pipe 1 usually reaches 2000m - 3000m, and the temperature at the bottom of the buried pipe can reach 100°C. At the beginning of the heating season, when the medium-deep buried pipe 1 starts to operate, the outlet water temperature can reach 60°C - 70°C, which is much higher than the specified inlet water temperature range of the heat pump unit, resulting in damage to the heat pump unit, etc. At the beginning of the heating season, the outlet of the medium-deep buried pipe 1 heat exchanger on the left is connected to the inlet of the shallow buried pipe 2 on the right. The high-temperature outlet water temperature first passes through the shallow buried pipe on the right. 1. Heat the soil temperature on the right, relieve the cold accumulation phenomenon caused by winter, and the shallow soil can also be used as a heat storage medium to be extracted and used when the heating capacity of the medium-deep buried pipe 1 is insufficient in the middle of the heating season; 2. Solve the problem that the outlet temperature of the medium-deep buried pipe 1 heat exchanger is too high in the early stage of the heating season.

[0048] In this embodiment, through the transfer of shallow soil heat, the energy interaction and coupling of the medium-deep and shallow buried pipes 2 are realized, improving the overall energy efficiency of the system and the utilization level of renewable energy.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep and shallow coupled geothermal buried pipe building energy supply system, characterized in that, It includes a first group of buried pipes and a second group of buried pipes located in different regions respectively. Both the first group of buried pipes and the second group of buried pipes include shallow buried pipes and medium-deep buried pipes. The water outlet of the medium-deep buried pipes is connected to the main water supply pipeline, and the water inlet is connected to the main return water pipeline; so that the return water in the main return water pipeline exchanges heat with geothermal energy through the medium-deep buried pipes and is used for building-side energy supply through the main water supply pipeline. The water inlet of the shallow buried pipes is connected to the main return water pipeline, and the water outlet is connected to the main water supply pipeline; it is used to make the return water in the main return water pipeline exchange heat with geothermal energy through the shallow buried pipes and be used for building-side energy supply through the main water supply pipeline. The water inlet of the shallow buried pipes of the first group of buried pipes is connected to the main return water pipeline, and the water outlet of the shallow buried pipes of the first group of buried pipes is communicated with the water inlet of the medium-deep buried pipes of the second group of buried pipes, so that the return water in the main return water pipeline enters the medium-deep buried pipes of the second group of buried pipes through the shallow buried pipes of the first group of buried pipes. The water outlets of the medium-deep buried pipes of the first group of buried pipes and the second group of buried pipes are both communicated with the water inlets of the shallow buried pipes, so that the water discharged from the medium-deep buried pipes enters the main water supply pipeline after passing through the shallow buried pipes.

2. The deep and shallow coupled geothermal buried pipe building energy supply system according to claim 1, wherein Valves are provided on the main water supply pipeline, the main return water pipeline, each of the shallow buried pipes, each of the medium-deep buried pipes, and the connecting pipelines between each shallow buried pipe and the medium-deep buried pipe.

3. The deep and shallow coupled geothermal buried pipe building energy supply system according to claim 1, characterized in that, Temperature detection units are provided at the main return water pipeline, the main water supply pipeline, the water outlets of each of the shallow buried pipes, and the water outlets of each of the medium-deep buried pipes.

4. The deep and shallow coupled geothermal buried pipe building energy supply system according to claim 3, characterized in that, There are multiple shallow buried pipes, and the main return water pipeline is sequentially connected to the water inlets and water outlets of each shallow buried pipe through pipelines, so that the return water of the main return water pipeline enters each shallow buried pipe in sequence.

5. The method for supplying energy to a building by a deep and shallow coupled geothermal buried pipe energy supply system according to any one of claims 1-4, characterized in that, In the winter heating condition, the medium-deep buried pipes bear the basic heat load of the building. Selectively open the medium-deep buried pipes of the first group of buried pipes or the second group of buried pipes, and monitor the supply water temperature and return water temperature of the medium-deep buried pipes. When the monitored return water temperature drops to 10 degrees Celsius, it indicates that the heat load on the building side is large; as the heat load increases, adopt the combined heating method of the medium-deep buried pipes of the first group of buried pipes and the second group of buried pipes, and continue to monitor the supply water temperature and return water temperature of the medium-deep buried pipes. When the heat load on the building side further increases and the medium-deep buried pipes of the first group of buried pipes and the second group of buried pipes cannot meet the requirements, then start the shallow buried pipe group of the operating buried pipe group, and the shallow pipe group of the other buried pipe group plays a peak shaving role. At the end of the heating period, the cooling load on the building side decreases, and dynamically adjust the heat supply amounts borne by the first group of buried pipes and the second group of buried pipes. Prioritize opening the shallow buried pipes of one of the buried pipe groups. When the return water temperature of the shallow buried pipes on the operating side is too low, open the medium-deep buried pipes of the other buried pipe group for heating. In the summer condition, selectively open the shallow buried pipes of the first group of buried pipes or the second group of buried pipes, and monitor the supply water temperature and return water temperature of the medium-deep buried pipes. When the monitored return water temperature exceeds 30 degrees Celsius, it indicates that the cooling load on the building side is large; as the cooling load increases, adopt the combined cooling method of the shallow buried pipes of the first group of buried pipes and the second group of buried pipes.

6. The method for supplying energy by the deep and shallow coupled geothermal buried pipe building energy supply system according to claim 1, characterized in that, When the heat load reaches 50%, the return water preferentially passes through the shallow buried pipes on one side for preheating and then flows to the medium-deep buried pipes on the other side.

7. The method for supplying energy by the deep and shallow coupled geothermal buried pipe building energy supply system according to claim 1, characterized in that, At the beginning of the heating season, the outlet of the medium-deep buried pipes on one side is connected to the inlet of the shallow buried pipes on the other side, so that the high-temperature water outlet after heat exchange through the medium-deep buried pipes is cooled by the shallow buried pipes.

8. The method for supplying energy by the deep and shallow coupled geothermal buried pipe building energy supply system according to claim 1, characterized in that, Swap the priorities of the first buried pipe group and the second buried pipe group in the next year.

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