Geothermal temperature gradient utilization building energy supply system

Abstract

The utility model discloses a geothermal temperature gradient utilization building energy supply system which comprises a soil source heat pump communicated with a first heat exchanger, an energy consumption unit, a water segregator and a second heat exchanger, the soil source heat pump is further communicated with the energy consumption unit, the water segregator is further communicated with a shallow buried pipe, and the shallow buried pipe is communicated with the first heat exchanger through a water collector; the second heat exchanger is respectively communicated with the first heat exchanger and the deep buried pipe, and the deep buried pipe is respectively communicated with the first heat exchanger and the second heat exchanger; the second heat exchanger communicates with a steam turbine, the steam turbine further communicates with the soil source heat pump, the energy consumption unit and the condenser, and the condenser communicates with the second heat exchanger. Shallow geothermal resources and deep geothermal resources are combined, stable and efficient cold and heat supply of a building all year round is achieved, and meanwhile the problems of soil heat unbalance and insufficient energy supply efficiency in a traditional system are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to building energy supply technical field especially relates to a geothermal temperature gradient utilization building energy supply system. BACKGROUND

[0002] With the development of social economy, the building energy demand increases year by year, especially in summer refrigeration and winter heating period, the pressure on the power system is particularly prominent. The existing building energy supply mode is mainly traditional fossil energy, which not only aggravates the energy shortage problem, but also causes serious environmental pollution. Geothermal energy as a stable, renewable clean energy has important application value in building energy supply; geothermal resources are divided into shallow geothermal and deep geothermal two kinds, wherein, shallow geothermal energy is derived from the solar radiation of the earth's surface, and the temperature is relatively low, which is suitable for low temperature energy supply demand; deep geothermal is buried in the deep underground, with the characteristics of high temperature and high stability, which is suitable for efficient heat utilization and power generation application.

[0003] At present, the ground source heat pump technology has been widely used in shallow geothermal utilization, shallow geothermal energy is extracted through the buried pipe for building heating and refrigeration. However, the traditional single shallow ground source heat pump system often faces the following problems in long-term operation:

[0004] 1. Soil heat imbalance: shallow buried pipe in the long-term refrigeration or heating process, will cause local soil heat excess or deficiency, and then lead to system efficiency reduction;

[0005] 2. Seasonal supply-demand contradiction: shallow geothermal energy is significantly affected by season and geographical conditions, and the energy supply stability is insufficient;

[0006] 3. Energy efficiency limit: pure dependence on shallow geothermal energy cannot meet the demand of large volume, high load building for cold and heat.

[0007] On the other hand, due to the high drilling cost and complex technology, the utilization rate of deep geothermal resources is relatively low, but its high temperature characteristics and seasonal stability provide an important supplement for building energy supply. In recent years, some researches try to use deep geothermal energy for power generation or regional heating, but the coupling utilization of deep and shallow geothermal resources has not been fully considered.

[0008] Therefore, how to organically combine deep and shallow geothermal resources, utilize the low temperature advantage of shallow geothermal energy and the high temperature stability of deep geothermal energy, and build an efficient and sustainable energy supply system, has become a problem to be solved in the current technical field. INVENTION CONTENTS

[0009] In order to solve the above technical problems, the utility model provides a kind of geothermal temperature gradient utilization building energy supply system, by combining shallow geothermal and deep geothermal resources, realize the stable, efficient cold, heat supply of building all year round, while solving the problem of soil heat imbalance and insufficient energy supply efficiency in traditional system.

[0010] The utility model adopts following technical scheme realization: a kind of geothermal temperature gradient utilization building energy supply system, including first heat exchanger, the first outlet of first heat exchanger is communicated with soil source heat pump, energy utilization unit outlet and water distributor respectively, the soil source heat pump is also communicated with energy utilization unit inlet, the water distributor is also communicated with the inlet of shallow ground buried pipe, the outlet of shallow ground buried pipe is communicated with the first inlet of first heat exchanger by water collector;

[0011] Second heat exchanger, the first outlet of second heat exchanger is communicated with the second outlet of first heat exchanger and the inlet of deep ground buried pipe respectively, the outlet of deep ground buried pipe is communicated with the second inlet of first heat exchanger and the first inlet of second heat exchanger respectively;

[0012] The second outlet of second heat exchanger is communicated with steam turbine, the steam turbine is also communicated with soil source heat pump, energy utilization unit and condenser respectively, and the condenser is communicated with the second inlet of second heat exchanger.

[0013] Preferably, the first outlet of the first heat exchanger is communicated with the soil source heat pump by the heat pump circulation electric regulating valve, and is communicated with the water distributor by the heat supplementing circulation shallow geothermal side electric regulating valve, the water distributor is communicated with the inlet of shallow ground buried pipe by shallow geothermal inlet electric regulating valve, and the outlet of shallow ground buried pipe is communicated with the water collector by shallow geothermal outlet electric regulating valve;

[0014] Flow sensor is arranged on the pipeline between the first heat exchanger and energy utilization unit;Flow sensor is arranged on the pipeline between the first heat exchanger and water distributor;

[0015] Inlet temperature sensor is arranged on the pipeline between the water distributor and the inlet of shallow ground buried pipe;Outlet temperature sensor is arranged on the pipeline between the outlet of shallow ground buried pipe and water collector;

[0016] Flow sensor is arranged on the pipeline between the soil source heat pump and energy utilization unit;Inlet temperature sensor is arranged on the inlet of energy utilization unit;Outlet temperature sensor is arranged on the outlet of energy utilization unit;Multiple underground temperature measuring elements are arranged on the shallow ground buried pipe.

[0017] The shallow ground-embedded pipe underground temperature measuring element, the heat pump circulation electric regulating valve, the heat supplementing circulation shallow geothermal side electric regulating valve, the shallow geothermal inlet electric regulating valve, the shallow geothermal outlet electric regulating valve, the heat supplementing circulation shallow geothermal side flow sensor, the shallow geothermal inlet flow sensor, the shallow ground-embedded pipe inlet temperature sensor, the shallow ground-embedded pipe outlet temperature sensor, the heat pump circulation flow sensor, the user side inlet temperature sensor and the user side outlet temperature sensor are electrically connected with the geothermal control unit.

[0018] Preferably, a first heat exchanger high-temperature side outlet temperature sensor and a heat supplementing circulation deep geothermal side electric regulating valve are sequentially arranged on the second outlet pipeline of the first heat exchanger; and a first heat exchanger high-temperature side inlet temperature sensor and a heat supplementing circulation deep geothermal side flow sensor are sequentially arranged on the second inlet pipeline of the first heat exchanger.

[0019] The first heat exchanger high-temperature side outlet temperature sensor, the heat supplementing circulation deep geothermal side electric regulating valve, the first heat exchanger high-temperature side inlet temperature sensor and the heat supplementing circulation deep geothermal side flow sensor are electrically connected with the geothermal control unit.

[0020] Preferably, a second heat exchanger geothermal side outlet temperature sensor and a second heat exchanger geothermal side outlet electric regulating valve are sequentially arranged on the first outlet pipeline of the second heat exchanger.

[0021] A second heat exchanger geothermal side inlet temperature sensor and a second heat exchanger geothermal side inlet electric regulating valve are sequentially arranged on the first inlet pipeline of the second heat exchanger.

[0022] The second heat exchanger geothermal side outlet temperature sensor, the second heat exchanger geothermal side outlet electric regulating valve, the second heat exchanger geothermal side inlet temperature sensor and the second heat exchanger geothermal side inlet electric regulating valve are electrically connected with the power generation control unit.

[0023] Preferably, a deep ground-embedded pipe inlet temperature sensor, a deep ground-embedded pipe inlet flow sensor and a deep ground-embedded pipe inlet electric regulating valve are sequentially arranged on the inlet pipeline of the deep ground-embedded pipe.

[0024] A deep ground-embedded pipe outlet temperature sensor, a deep ground-embedded pipe outlet flow sensor and a deep ground-embedded pipe outlet electric regulating valve are sequentially arranged on the outlet pipeline of the deep ground-embedded pipe; and a plurality of deep ground-embedded pipe underground temperature measuring elements are arranged on the deep ground-embedded pipe.

[0025] The deep ground-embedded pipe inlet temperature sensor, the deep ground-embedded pipe inlet flow sensor, the deep ground-embedded pipe inlet electric regulating valve, the deep ground-embedded pipe outlet temperature sensor, the deep ground-embedded pipe outlet flow sensor, the deep ground-embedded pipe outlet electric regulating valve and the deep ground-embedded pipe underground temperature measuring element are electrically connected with the geothermal control unit.

[0026] Preferably, a second heat exchanger hot side outlet temperature sensor and a second heat exchanger hot side outlet electric regulating valve are sequentially arranged on the second outlet pipeline of the second heat exchanger.

[0027] A second heat exchanger hot side inlet temperature sensor and a second heat exchanger hot side inlet electric regulating valve are sequentially arranged on the second inlet pipeline of the second heat exchanger.

[0028] The second heat exchanger hot side outlet temperature sensor, the second heat exchanger hot side outlet electric regulating valve, the second heat exchanger hot side inlet temperature sensor and the second heat exchanger hot side inlet electric regulating valve are electrically connected with the power generation control unit.

[0029] Compared with the prior art, the utility model has the beneficial effects that:

[0030] The building energy supply system provided by the utility model utilizes a heat exchanger, a soil source heat pump, a water distributor, a water collector, a steam turbine, a condenser, a geothermal control unit and a power generation control unit, and corresponding electric regulating valves, temperature sensors and flow sensors are configured, so that the shallow geothermal resource and the deep geothermal resource can be combined, the problems of soil heat imbalance of the shallow geothermal system and insufficient utilization of the deep geothermal resource are solved, stable and efficient cold and heat energy supply of the building throughout the year is realized, the summer electricity tension is relieved, and the energy utilization efficiency is improved.

[0031] The characteristics of geothermal resources of different depths are fully utilized by adopting the deep-shallow coupling design, the overall energy efficiency of the energy supply system is enhanced, and the energy utilization efficiency is improved; the soil heat balance is effectively restored in the transition season by the heat supplement mechanism, the stability of long-term operation is ensured, and the soil heat imbalance is effectively relieved; the building electricity demand is partially replaced by utilizing the deep geothermal resource to drive the heat pump to generate electricity, the summer power grid peak pressure is relieved, and the summer electricity tension is effectively reduced; the energy supply system can flexibly switch the operation mode according to the season, and meet the cold and heat supply demand of the building throughout the year. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a whole structure schematic view of the utility model;

[0033] Figure 2 It is a summer operation flow chart of the utility model;

[0034] Figure 3 It is a transition season operation flow chart of the utility model;

[0035] Figure 4 It is a winter operation flow chart of the utility model.

[0036] MAIN SYMBOL EXPLANATION:

[0037] 1, first heat exchanger; 2, second heat exchanger; 3, soil source heat pump; 4, energy using unit; 5, water distributor; 6, water collector; 7, steam turbine; 8, condenser; 9, deep ground buried pipe outlet flow sensor; 10, deep ground buried pipe inlet flow sensor; 11, deep ground buried pipe inlet electric regulating valve; 12, deep ground buried pipe outlet electric regulating valve; 13, deep ground buried pipe inlet temperature sensor; 14, deep ground buried pipe outlet temperature sensor; 15, deep ground buried pipe underground temperature measuring element; 16, shallow ground buried pipe underground temperature measuring element; 17, first heat exchanger high temperature side outlet temperature sensor; 18, first heat exchanger high temperature side inlet temperature sensor; 19, heat supplementing circulation deep ground heat side flow sensor; 20, heat supplementing circulation deep ground heat side electric regulating valve; 21, second heat exchanger ground heat side outlet electric regulating valve; 22, second heat exchanger ground heat side inlet electric regulating valve; 23, second heat exchanger ground heat side outlet temperature sensor; 24, second heat exchanger ground heat side inlet temperature sensor; 25, second heat exchanger ground heat side outlet temperature sensor; 26, second heat exchanger heat using side inlet temperature sensor; 27, second heat exchanger heat using side outlet electric regulating valve; 28, second heat exchanger heat using side inlet electric regulating valve; 29, heat pump circulation electric regulating valve; 30, heat supplementing circulation shallow ground heat side electric regulating valve; 31, heat supplementing circulation shallow ground heat side flow sensor; 32, heat pump circulation flow sensor; 33, user side inlet temperature sensor; 34, user side outlet temperature sensor; 35, shallow ground heat inlet flow sensor; 36, shallow ground buried pipe inlet temperature sensor; 37, shallow ground buried pipe outlet temperature sensor; 38, shallow ground heat inlet electric regulating valve; 39, shallow ground heat outlet electric regulating valve; 40, ground heat control unit; 41, power generation control unit. DETAILED DESCRIPTION

[0038] Hereinafter, the utility model will be further described in combination with the drawings and specific embodiments, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0039] Embodiment:

[0040] Please combine Figures 1-2 The ground heat temperature gradient utilization building energy supply system of the embodiment comprises a first heat exchanger 1, a first outlet of the first heat exchanger 1 is communicated with a soil source heat pump 3, an energy using unit 4 outlet and a water distributor 5 respectively, the soil source heat pump 3 is also communicated with the energy using unit 4 inlet, the water distributor 5 is also communicated with the inlet of shallow ground buried pipe, and the outlet of shallow ground buried pipe is communicated with the first inlet of first heat exchanger 1 through water collector 6.

[0041] In specific implementation, the first outlet of the first heat exchanger 1 is communicated with the ground source heat pump 3 through a heat pump circulation electric regulating valve 29, and communicated with the water distributor 5 through a heat supplement circulation shallow geothermal side electric regulating valve 30, the water distributor 5 is communicated with the inlet of the shallow ground heat pipe through a shallow geothermal inlet electric regulating valve 38, and the outlet of the shallow ground heat pipe is communicated with the water collector 6 through a shallow geothermal outlet electric regulating valve 39.

[0042] In specific implementation, a heat supplement circulation shallow geothermal side flow sensor 31 is arranged on the pipeline between the first heat exchanger 1 and the energy using unit 4; a shallow geothermal inlet flow sensor 35 is arranged on the pipeline between the first heat exchanger 1 and the water distributor 5;

[0043] In specific implementation, a shallow ground heat pipe inlet temperature sensor 36 is arranged on the pipeline between the water distributor 5 and the inlet of the shallow ground heat pipe; a shallow ground heat pipe outlet temperature sensor 37 is arranged on the pipeline between the outlet of the shallow ground heat pipe and the water collector 6.

[0044] In specific implementation, a heat pump circulation flow sensor 32 is arranged on the pipeline between the ground source heat pump 3 and the energy using unit 4; a user side inlet temperature sensor 33 is arranged at the inlet of the energy using unit 4, and a user side outlet temperature sensor 34 is arranged at the outlet of the energy using unit 4; a plurality of shallow ground heat pipe underground temperature measuring elements 16 are arranged on the shallow ground heat pipe.

[0045] In specific implementation, a first heat exchanger high temperature side outlet temperature sensor 17 and a heat supplement circulation deep geothermal side electric regulating valve 20 are arranged on the second outlet pipeline of the first heat exchanger 1 in sequence; a first heat exchanger high temperature side inlet temperature sensor 18 and a heat supplement circulation deep geothermal side flow sensor 19 are arranged on the second inlet pipeline of the first heat exchanger 1 in sequence.

[0046] In specific implementation, the shallow ground heat pipe underground temperature measuring elements 16, the heat pump circulation electric regulating valve 29, the heat supplement circulation shallow geothermal side electric regulating valve 30, the shallow geothermal inlet electric regulating valve 38, the shallow geothermal outlet electric regulating valve 39, the heat supplement circulation shallow geothermal side flow sensor 31, the shallow geothermal inlet flow sensor 35, the shallow ground heat pipe inlet temperature sensor 36, the shallow ground heat pipe outlet temperature sensor 37, the heat pump circulation flow sensor 32, the user side inlet temperature sensor 33, the user side outlet temperature sensor 34, the first heat exchanger high temperature side outlet temperature sensor 17, the heat supplement circulation deep geothermal side electric regulating valve 20, the first heat exchanger high temperature side inlet temperature sensor 18 and the heat supplement circulation deep geothermal side flow sensor 19 are electrically connected with the geothermal control unit 40.

[0047] A second heat exchanger 2, a first outlet of the second heat exchanger 2 is communicated with a second outlet of the first heat exchanger 1 and an inlet of a deep ground heat pipe respectively, an outlet of the deep ground heat pipe is communicated with a second inlet of the first heat exchanger 1 and a first inlet of the second heat exchanger 2 respectively;

[0048] A second outlet of the second heat exchanger 2 is communicated with a steam turbine 7, the steam turbine 7 is further communicated with the soil source heat pump 3, the energy using unit 4 and a condenser 8 respectively, the condenser 8 is communicated with a second inlet of the second heat exchanger 2.

[0049] In particular implementation, a second heat exchanger geothermal side outlet temperature sensor 23 and a second heat exchanger geothermal side outlet electric regulating valve 21 are sequentially arranged on a first outlet pipeline of the second heat exchanger 2.

[0050] In particular implementation, a second heat exchanger geothermal side inlet temperature sensor 24 and a second heat exchanger geothermal side inlet electric regulating valve 22 are sequentially arranged on a first inlet pipeline of the second heat exchanger 2.

[0051] In particular implementation, a deep ground heat pipe inlet temperature sensor 13, a deep ground heat pipe inlet flow sensor 10 and a deep ground heat pipe inlet electric regulating valve 11 are sequentially arranged on an inlet pipeline of the deep ground heat pipe.

[0052] In particular implementation, a deep ground heat pipe outlet temperature sensor 14, a deep ground heat pipe outlet flow sensor 9 and a deep ground heat pipe outlet electric regulating valve 12 are sequentially arranged on an outlet pipeline of the deep ground heat pipe, and a plurality of deep ground heat pipe underground temperature measuring elements 15 are arranged on the deep ground heat pipe.

[0053] In particular implementation, the deep ground heat pipe inlet temperature sensor 13, the deep ground heat pipe inlet flow sensor 10, the deep ground heat pipe inlet electric regulating valve 11, the deep ground heat pipe outlet temperature sensor 14, the deep ground heat pipe outlet flow sensor 9, the deep ground heat pipe outlet electric regulating valve 12 and the deep ground heat pipe underground temperature measuring elements 15 are electrically connected with a geothermal control unit 40.

[0054] In particular implementation, a second heat exchanger heat side outlet temperature sensor 25 and a second heat exchanger heat side outlet electric regulating valve 27 are sequentially arranged on a second outlet pipeline of the second heat exchanger 2.

[0055] In particular implementation, a second heat exchanger heat side inlet temperature sensor 26 and a second heat exchanger heat side inlet electric regulating valve 28 are sequentially arranged on a second inlet pipeline of the second heat exchanger 2.

[0056] In specific implementation, the second heat exchanger geothermal side outlet temperature sensor 23, the second heat exchanger geothermal side outlet electric regulating valve 21, the second heat exchanger geothermal side inlet temperature sensor 24, the second heat exchanger geothermal side inlet electric regulating valve 22, the second heat exchanger hot side outlet temperature sensor 25, the second heat exchanger hot side outlet electric regulating valve 27, the second heat exchanger hot side inlet temperature sensor 26 and the second heat exchanger hot side inlet electric regulating valve 28 are electrically connected with the power generation control unit 41.

[0057] It should be noted that the drilling depth of the deep ground heat exchanger is determined according to the geological conditions, and is generally more than 1000 meters; the shallow ground heat exchanger is buried to a depth of 100 meters and is uniformly arranged in a ring or matrix form. The arrangement form and quantity of the shallow ground heat exchanger group are designed according to the building load demand and the geological conditions, and high-density polyethylene (HDPE) material is usually used to ensure durability.

[0058] The energy supply system of the present application can dynamically adjust the operating state of the deep and shallow ground heat exchangers according to the season and building load demand, realize optimal allocation of cold and heat resources, monitor soil heat, and ensure soil temperature balance by equipping the system with high-precision temperature sensors to monitor the soil temperature around the shallow and deep ground heat exchangers in real time. The system also optimizes energy recovery. In summer power generation mode, the waste heat is fed back to the soil source heat pump 3 through the system, effectively improving the overall energy utilization rate.

[0059] Referring to Figure 2 The summer operation flowchart of the present application is shown in FIG. 3. The shallow ground heat exchanger group extracts shallow geothermal heat and supplies cooling to the building through the soil source heat pump 3 to ensure the comfort of the indoor temperature. The deep ground heat exchanger utilizes high-temperature geothermal heat to drive the steam turbine 7 through the second heat exchanger 2 to generate auxiliary power for the building to relieve the summer peak power demand and optimize the building energy structure.

[0060] The specific operation mode is as follows: start the heat pump circulation electric regulating valve 29 through the geothermal control unit 40, use shallow geothermal heat for building refrigeration, collect and compare the real-time data of the temperature and flow sensors through the geothermal control unit 40, control the heat pump circulation electric regulating valve 29 to adjust the cooling capacity of the shallow geothermal heat according to the user load feedback data, and complete cycle ③. At the same time, mobilize the deep geothermal heat to generate power through the power generation control unit 41, and complete cycle ⑧.

[0061] Referring to Figure 3 The transition season operation flowchart of the present application is shown in FIG. 4. After the cooling season ends, cold energy often accumulates in the soil due to long-term extraction of heat by the shallow ground heat exchanger, leading to soil heat imbalance. The deep ground heat exchanger opens cycle ① to supply heat to the shallow ground heat exchanger group through the first heat exchanger 1 to restore the temperature of the shallow soil and ensure long-term stable operation of the system. This operation mode can also improve the utilization efficiency of deep geothermal energy and avoid resource waste.

[0062] Specific operation mode is: according to the shallow ground temperature measuring element 16 feedback ground temperature signal opening heat supplement cycle deep geothermal side electric regulating valve 20, geothermal control unit 40 according to the real-time feedback of ground temperature data adjusts heat supplement cycle deep geothermal side electric regulating valve 20, completes heat supplement cycle 1, 2.Second heat exchanger geothermal side outlet temperature sensor 23, second heat exchanger geothermal side inlet temperature sensor 24 detects that system temperature reaches the cycle 7 that can be opened, simultaneously opens second heat exchanger geothermal side outlet electric regulating 21, second heat exchanger geothermal side inlet electric regulating valve 22, when second heat exchanger geothermal side outlet temperature sensor 23, second heat exchanger geothermal side inlet temperature sensor 24 detects that system temperature does not reach the cycle 7 that can be opened, simultaneously closes second heat exchanger geothermal side outlet electric regulating 21, second heat exchanger geothermal side inlet electric regulating valve 22, ends building power supply cycle 7.

[0063] Referring to Figure 4 As shown in the winter operation flow chart of the present application: deep shallow coupling ground pipe group provides heat energy to building together, further improves shallow ground pipe group water temperature through water temperature heat exchange with deep ground pipe, and whether closing deep heat supplement is determined through energy management unit, and deep geothermal power generation module is opened simultaneously.

[0064] Specific operation mode is: geothermal control unit 40 opens shallow geothermal cycle 3, at this time, if building heating load demand cannot be met, simultaneously open heat supplement cycle deep geothermal side electric regulating valve 20, open cycle 1, power generation control unit 41 closes system 7, at this time, deep and shallow ground pipe cooperates heat supply, satisfies building heating demand.

[0065] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-substantial changes and replacements made by those skilled in the art on the basis of the present application all belong to the scope of protection claimed by the present application.

Claims

1. A building energy supply system utilizing geothermal temperature gradient, characterized in that: The system includes a first heat exchanger (1), the first outlet of which is connected to a soil source heat pump (3), the outlet of an energy-consuming unit (4) and a water distributor (5), respectively. The soil source heat pump (3) is also connected to the inlet of the energy-consuming unit (4), and the water distributor (5) is also connected to the inlet of a shallow underground pipe. The outlet of the shallow underground pipe is connected to the first inlet of the first heat exchanger (1) through a water collector (6). The second heat exchanger (2) has its first outlet connected to the second outlet of the first heat exchanger (1) and the inlet of the deep buried pipe, respectively. The outlet of the deep buried pipe is connected to the second inlet of the first heat exchanger (1) and the first inlet of the second heat exchanger (2). The second outlet of the second heat exchanger (2) is connected to a steam turbine (7), which is also connected to a soil source heat pump (3), an energy-consuming unit (4) and a condenser (8), and the condenser (8) is connected to the second inlet of the second heat exchanger (2).

2. The building energy supply system utilizing geothermal temperature gradient as described in claim 1, characterized in that: The first outlet of the first heat exchanger (1) is connected to the soil source heat pump (3) through the heat pump circulation electric regulating valve (29), and is connected to the water distributor (5) through the supplementary heat circulation shallow geothermal side electric regulating valve (30). The water distributor (5) is connected to the inlet of the shallow buried pipe through the shallow geothermal inlet electric regulating valve (38), and the outlet of the shallow buried pipe is connected to the water collector (6) through the shallow geothermal outlet electric regulating valve (39). A shallow geothermal side flow sensor (31) for supplementary heating circulation is installed on the pipe between the first heat exchanger (1) and the energy-consuming unit (4); a shallow geothermal inlet flow sensor (35) is installed on the pipe between the first heat exchanger (1) and the water distributor (5); A shallow underground pipe inlet temperature sensor (36) is installed on the pipe between the water distributor (5) and the inlet of the shallow underground pipe; a shallow underground pipe outlet temperature sensor (37) is installed on the pipe between the outlet of the shallow underground pipe and the water collector (6). A heat pump circulation flow sensor (32) is installed on the pipeline between the soil source heat pump (3) and the energy consumption unit (4); a user-side inlet temperature sensor (33) is installed at the inlet of the energy consumption unit (4), and a user-side outlet temperature sensor (34) is installed at the outlet of the energy consumption unit (4); multiple shallow underground temperature measuring elements (16) are arranged on the shallow underground pipe. The shallow underground temperature measuring element (16), heat pump circulation electric regulating valve (29), supplementary heat circulation shallow geothermal side electric regulating valve (30), shallow geothermal inlet electric regulating valve (38), shallow geothermal outlet electric regulating valve (39), supplementary heat circulation shallow geothermal side flow sensor (31), shallow geothermal inlet flow sensor (35), shallow underground pipe inlet temperature sensor (36), shallow underground pipe outlet temperature sensor (37), heat pump circulation flow sensor (32), user side inlet temperature sensor (33), and user side outlet temperature sensor (34) are all electrically connected to the geothermal control unit (40).

3. A building energy supply system utilizing geothermal temperature gradient as described in claim 2, characterized in that: The first heat exchanger (1) is provided with a high-temperature side outlet temperature sensor (17) and a deep geothermal side electric regulating valve (20) for the heat exchanger in the supplementary heat circulation in the second outlet pipe in sequence; the first heat exchanger (1) is provided with a high-temperature side inlet temperature sensor (18) and a deep geothermal side flow sensor (19) for the heat exchanger in the supplementary heat circulation in the second inlet pipe in sequence. The high-temperature side outlet temperature sensor (17) of the first heat exchanger, the electric regulating valve (20) of the deep geothermal side of the supplementary heat circulation, the high-temperature side inlet temperature sensor (18) of the first heat exchanger, and the flow sensor (19) of the deep geothermal side of the supplementary heat circulation are all electrically connected to the geothermal control unit (40).

4. A building energy supply system utilizing geothermal temperature gradient as described in claim 3, characterized in that: The second heat exchanger (2) is provided with a geothermal side outlet temperature sensor (23) and a geothermal side outlet electric regulating valve (21) in sequence on the first outlet pipe; The second heat exchanger (2) is provided with a geothermal side inlet temperature sensor (24) and a geothermal side inlet electric regulating valve (22) in sequence on the first inlet pipe; The second heat exchanger geothermal side outlet temperature sensor (23), the second heat exchanger geothermal side outlet electric regulating valve (21), the second heat exchanger geothermal side inlet temperature sensor (24), and the second heat exchanger geothermal side inlet electric regulating valve (22) are all electrically connected to the power generation control unit (41).

5. A building energy supply system utilizing geothermal temperature gradient as described in claim 4, characterized in that: The inlet pipe of the deep buried pipe is sequentially equipped with a deep buried pipe inlet temperature sensor (13), a deep buried pipe inlet flow sensor (10), and a deep buried pipe inlet electric regulating valve (11). The deep underground pipe outlet pipe is sequentially equipped with a deep underground pipe outlet temperature sensor (14), a deep underground pipe outlet flow sensor (9), and a deep underground pipe outlet electric regulating valve (12); multiple deep underground pipe underground temperature measuring elements (15) are arranged on the deep underground pipe. The deep buried pipe inlet temperature sensor (13), deep buried pipe inlet flow sensor (10), deep buried pipe inlet electric regulating valve (11), deep buried pipe outlet temperature sensor (14), deep buried pipe outlet flow sensor (9), deep buried pipe outlet electric regulating valve (12), and deep buried pipe underground temperature measuring element (15) are all electrically connected to the geothermal control unit (40).

6. A building energy supply system utilizing geothermal temperature gradient as described in claim 5, characterized in that: The second heat exchanger (2) is provided with a second heat exchanger hot side outlet temperature sensor (25) and a second heat exchanger hot side outlet electric regulating valve (27) in sequence on the second outlet pipe; The second heat exchanger (2) is provided with a second heat exchanger hot side inlet temperature sensor (26) and a second heat exchanger hot side inlet electric regulating valve (28) in sequence on the second inlet pipe; The second heat exchanger hot side outlet temperature sensor (25), the second heat exchanger hot side outlet electric regulating valve (27), the second heat exchanger hot side inlet temperature sensor (26), and the second heat exchanger hot side inlet electric regulating valve (28) are all electrically connected to the power generation control unit (41).

Images