CN117073097A

CN117073097A - Shan Jingduo buried pipe type ground buried pipe air conditioning system and cooling and heating method thereof

Info

Publication number: CN117073097A
Application number: CN202311079358.3A
Authority: CN
Inventors: 郭海明; 周新河
Original assignee: Hydrogeology Bureau of China National Administration of Coal Geology
Current assignee: Hydrogeology Bureau of China National Administration of Coal Geology
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2023-11-17

Abstract

The application provides a single-well multi-buried pipe type ground pipe air conditioning system and a cooling and heating method thereof, wherein the air conditioning system comprises a well hole, a water separator, a water collector, a heat pump unit and air conditioning tail end equipment, the well hole is arranged in a region with underground water runoff, and a plurality of ground pipe heat exchangers are arranged in the well hole; the heat pump unit, the water separator, the ground heat exchanger and the water collector are sequentially connected in a loop along the flow direction of a first working medium of the heat pump unit, and a plurality of ground heat exchangers are connected in parallel; and along the second working medium flow direction of the heat pump unit, the heat pump unit and the air conditioner terminal equipment form loop connection. By adopting the application, the ground temperature required by the well hole can be effectively supplemented by the ground water, the unbalance of cold and heat in winter and summer is not required to be considered, and the heat exchange efficiency of a single well is high; the system can be applied to the areas mainly heating or mainly cooling, the underground space occupied by the system is reduced, and the influence on urban construction planning is reduced.

Description

Shan Jingduo buried pipe type ground buried pipe air conditioning system and cooling and heating method thereof

Technical Field

The application relates to the technical field of buried pipe type soil heat source pump systems, in particular to a single-well multi-buried pipe type buried pipe air conditioning system and a cooling and heating method thereof.

Background

The soil source heat pump system is a high-efficiency energy-saving air conditioning system which utilizes underground shallow ground temperature resources and can supply heat and refrigerate. The soil source is used as a heat source for heating by a heat pump in winter, so that heat in the geothermal energy is taken out, and after the temperature level is increased, the soil source is used for indoor heating; in summer, the heat is integrated and released into stratum soil. The energy-saving, high-efficiency, environment-friendly and sustainable advantages are obvious.

However, there are also limitations to the ground source heat pump system, such as:

1. the ground-buried pipe heat exchange system is one of main components of the soil source heat pump system, serves as a huge energy storage body, serves as a heat source in winter and a cold source in summer, and is suitable for being applied to buildings with both refrigeration requirements and heating requirements, but because the design of the ground-buried pipe heat exchange system needs to calculate the annual cold-hot unbalance rate and keep relative cold-hot balance in later operation, the ground-buried pipe heat exchange system is difficult to meet the application in areas mainly heated or mainly cooled.

2. The ground heat exchanger is 3-6 m interval, generally one single U or double U-shaped vertical ground buried pipe is buried in one drilling hole, the larger the project is, the more the required drilling holes are, the larger the underground space is occupied, and therefore the later construction planning, particularly the long-term development planning of cities, is affected.

Disclosure of Invention

The technical problems to be solved by the application are as follows: 1. how to meet the requirement that the soil source heat pump system is applied to an area mainly used for heating or mainly used for cooling; 2. how to reduce the occupation of underground space by the ground source heat pump system.

The technical scheme for solving the technical problems is as follows:

the application provides a single-well multi-buried pipe type ground pipe air conditioning system which comprises a well hole, a water separator, a water collector, a heat pump unit and air conditioning tail end equipment, wherein the well hole is arranged in a region with underground water runoff, and a plurality of ground pipe heat exchangers are arranged in the well hole; the heat pump unit, the water separator, the ground heat exchanger and the water collector are sequentially connected in a loop along the flow direction of a first working medium of the heat pump unit, and a plurality of ground heat exchangers are connected in parallel; and the heat pump unit is connected with air conditioner terminal equipment in a loop along the second working medium flow direction of the heat pump unit.

The beneficial effects of the application are as follows:

1. the well hole is arranged in the area with the underground water runoff, so that the ground temperature required by the well hole can be effectively supplemented by the underground water without considering the unbalance of cold and heat in winter and summer, and the heat exchange efficiency of a single well is high by utilizing the underground water runoff for heat exchange;

2. the application of the system in the area mainly heating or mainly cooling is satisfied, the underground space occupied by the system is reduced, and the influence on urban construction planning is reduced;

3. the underground water-saving type heating and cooling device is particularly suitable for underground water-rich sand gravel stratum areas, and is mostly used for heating or cooling villas, small buildings and the like;

4. the pipeline is convenient to install and simple to control.

On the basis of the technical scheme, the application can be improved as follows.

Further, a ground source pump is arranged on a pipeline from the water collector to the heat pump unit; and an air conditioner pump is further arranged on a pipeline from the air conditioner terminal equipment to the heat pump unit.

The kinetic energy of the first working medium and the second working medium of the heat pump unit is conveniently ensured, and the reliable operation of the system is maintained.

Further, the heat pump unit further comprises a first valve, a second valve and a third valve, wherein the first working medium outlet and inlet and the second working medium outlet and inlet of the heat pump unit are respectively provided with at least one first valve; one end of the second valve is connected to a pipeline from the heat pump unit to the water separator through a pipeline, and the other end of the second valve is connected to a pipeline from the air conditioner terminal equipment to the heat pump unit through a pipeline; one end of the third valve is connected to the pipeline from the water collector to the heat pump unit through a pipeline, and the other end of the third valve is connected to the pipeline from the heat pump unit to the air conditioner terminal equipment through a pipeline.

The first valve, the second valve and the third valve can be used for waterway switching, when the required cooling capacity is small in the early and final stages of summer, all the first valves can be closed, the second valve and the third valve are opened, the heat pump unit does not work, the shallow geothermal energy is utilized for direct cooling, electric energy is saved, and the running cost of the system is greatly reduced. When the heat pump unit is required to work, all the first valves are opened, the second valve and the third valve are closed, and the heat pump unit works, so that high-power heat supply or cold supply is facilitated.

Further, the other end of the second valve is connected to a pipeline from the air conditioner pump to the heat pump unit through a pipeline; one end of the third valve is connected to a pipeline from the ground source pump to the heat pump unit through a pipeline.

The ground source pump and the air conditioner pump can play a role under any working condition, and the reliable operation of the system is ensured.

Furthermore, soft water is adopted for both the first working medium and the second working medium of the heat pump unit.

Prevent structure and corruption, system life is long.

Further, the air conditioner further comprises water softening equipment, an outlet of the water softening equipment is connected with a low-level water tank, an outlet of the low-level water tank is connected with constant pressure equipment, and an outlet of the constant pressure equipment is connected to a pipeline between the air conditioner pump and air conditioner terminal equipment.

The air conditioner terminal equipment is convenient to supplement water and fix pressure, the working pressure of the air conditioner terminal equipment is maintained, the heat release and cold release efficiency is guaranteed to be high, and the heat exchange efficiency in the heat pump unit is high.

Furthermore, the outlet of the water softening device is also connected with a high-level water tank through a branch, and the outlet of the high-level water tank is connected to a pipeline from the water collector to the ground source pump.

The high-level water tank supplements water for the buried pipe heat exchanger by utilizing the height difference, so that the working pressure of the buried pipe heat exchanger is convenient to maintain, and the heat exchange efficiency is high; and a constant-pressure water pump is not needed, so that equipment investment is saved, and economic benefit is improved.

Further, the well bore is arranged in the water-rich area and extends to the sand gravel stratum, and backfill materials with the lithology same as that of the original stratum of the well bore are backfilled in the well bore.

The underground water runoff speed of the sand gravel stratum is high, and the single well heat exchange efficiency is high; and through backfilling, the runoff flow velocity in the well bore is kept consistent with that before drilling, so that the geothermal energy in the well bore can be conveniently supplemented.

Further, the ground heat exchangers are arranged vertically, a plurality of ground heat exchangers are uniformly distributed along the inner side wall of the well hole, and at least one ground heat exchanger is positioned at one side of the well hole, which is opposite to the runoff direction of groundwater.

The application also provides a cooling and heating method, which is realized based on the single-well multi-buried pipe type buried pipe air conditioning system and comprises the following steps:

judging cooling and heating requirements, and selecting corresponding working states according to the cooling and heating requirements; the selecting the corresponding working state according to the cooling and heating demands comprises the following steps:

when the temperature difference between the required cooling temperature and the outdoor temperature is not more than 10 ℃, selecting a working state 1: closing all the first valves, opening the second valve and the third valve, and converging the first medium and the second medium into a loop, wherein the converged medium directly flows to air conditioner terminal equipment through the third valve for cooling after being cooled in the buried pipe heat exchanger; the water flows to the ground heat exchanger through a second valve to form circulation;

when the temperature difference between the required cooling temperature and the outdoor temperature is more than 10 ℃ or the heat supply is required, the working state 2 is selected: and opening all the first valves, closing the second valve and the third valve to isolate the first medium and the second medium from each other, wherein the first medium circularly flows between the ground heat exchanger and the heat pump unit, the second medium circularly flows between the air conditioner terminal equipment and the heat pump unit, and heat transfer is carried out between the first medium and the second medium through the heat pump unit.

By adopting the cooling and heating method, when the required cooling quantity is small in the early stage and the final stage of summer, the heat pump unit with the highest power consumption does not work, and the shallow geothermal energy is utilized to directly supply cooling, so that the running cost of the system is greatly reduced; and the working state is convenient to switch and the operation is simple and convenient.

Drawings

Fig. 1 is a schematic structural view of the present application.

Fig. 2 is a cross-sectional view taken along A-A of fig. 1.

In the drawings, the technical features represented by the reference numerals are as follows:

1-a wellbore; 2-a buried pipe heat exchanger; 3-a water separator; 4-a water collector; 5-a heat pump unit; 6-an air conditioning end unit; 7-a ground source pump; 8-an air conditioner pump; 9-a first valve; 10-a second valve; 11-a third valve; 12-a water softening device; 13-low level tank; 14-constant pressure equipment; 15-high level water tank.

Detailed Description

The principles and features of the present application are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the application.

The application is seen in fig. 1-2.

The application provides a single-well multi-buried pipe type ground pipe air conditioning system which comprises a well hole 1, a water separator 3, a water collector 4, a heat pump unit 5 and air conditioning tail end equipment 6, wherein the well hole 1 is arranged in a region with underground water runoff, and a plurality of ground pipe heat exchangers 2 are arranged in the well hole 1; the heat pump unit 5, the water separator 3, the ground heat exchanger 2 and the water collector 4 are sequentially connected in a loop along the flow direction of the first working medium of the heat pump unit 5, and a plurality of ground heat exchangers 2 are connected in parallel; along the second working medium flow direction of the heat pump unit 5, the heat pump unit 5 and the air conditioning terminal equipment 6 form a loop connection.

Principle of:

1. in winter, the ground heat exchanger 2 can be used as a heat source, and the first working medium of the heat pump unit 5 absorbs low-temperature energy in the ground heat exchanger 2, circularly flows and transfers heat to the second working medium through the heat pump unit 5. The second working medium delivers heat to the air conditioning end unit 6 for the user. 2. In summer, the buried pipe heat exchanger 2 can be used as a cold source, and the first working medium of the heat pump unit 5 is cooled in the buried pipe heat exchanger 2, circularly flows and absorbs heat of the second working medium through the heat pump unit 5. The second working medium delivers cooling energy to the air conditioning end unit 6 for cooling the user.

The heat pump unit 5 can adopt an evaporator and a condenser, and the heat transfer direction of the heat pump unit to the first working medium and the second working medium can be realized by the conversion of fluorine paths in the unit, so that the cooling and heating functions are switched, an external water pipeline is not required to be changed, and the heat pump unit 5 is a common product name in the field. The air-conditioning terminal equipment 6 is used for releasing cold and heat, and can adopt an air-conditioning indoor unit, a fan coil, a fresh air unit or floor radiation and the like. By drilling the well bore 1 into the water-rich zone sand gravel formation, groundwater replenishment and restoration of the desired geothermal energy within the well bore 1 is facilitated.

Note that: ground temperature energy: the first working medium is heated or cooled to a certain temperature by utilizing the temperature of underground water or soil, so that heat in the first working medium is conveniently extracted by a heat pump or released (also called cold energy extraction) to the first working medium, and winter heating or summer refrigeration is performed. Therefore, the geothermal energy is different from the geothermal energy with the temperature more than or equal to 25 ℃.

Note that: the first working medium is a heat source and a cold source working medium of the heat pump unit 5 and is used for heat extraction of the heat pump unit 5 during heat supply and heat extraction of the heat pump unit 5 during cold supply. The second working medium is a heat release and cold release working medium of the heat pump unit 5, and is used for releasing heat at the air-conditioning end equipment 6 during heat supply and releasing cold at the air-conditioning end equipment 6 during cold supply. The first working medium and the second working medium can both adopt water. The heat pump unit 5 is also provided with a volatile heat exchange medium which is used as working medium of an evaporator and a condenser in the heat pump unit 5 and used for indirectly conducting heat transfer between the first working medium and the second working medium.

In summary, by adopting the application, 1, the well bore 1 is arranged in the area with groundwater runoff, the ground temperature required by the well bore 1 can be effectively supplemented by groundwater, the amount of unbalance of cold and heat in winter and summer is not required to be considered, and the heat exchange efficiency of a single well is high by utilizing the groundwater runoff heat exchange; 2. the application of the system in the area mainly heating or mainly cooling is satisfied, the underground space occupied by the system is reduced, and the influence on urban construction planning is reduced; 3. the underground water-saving type heating and cooling device is particularly suitable for underground water-rich sand gravel stratum areas, and is mostly used for heating or cooling villas, small buildings and the like; 4. the pipeline is convenient to install and simple to control.

Further, a ground source pump 7 is further arranged on the pipeline from the water collector 4 to the heat pump unit 5; an air conditioner pump 8 is further arranged on a pipeline from the air conditioner terminal equipment 6 to the heat pump unit 5.

The kinetic energy of the first working medium and the second working medium of the heat pump unit 5 is conveniently ensured, and the reliable operation of the system is maintained.

Further, the heat pump unit further comprises a first valve 9, a second valve 10 and a third valve 11, wherein the first working medium outlet and inlet and the second working medium outlet and inlet of the heat pump unit 5 are respectively provided with at least one first valve 9; one end of the second valve 10 is connected to the pipeline from the heat pump unit 5 to the water separator 3 through a pipeline, and the other end of the second valve 10 is connected to the pipeline from the air conditioner terminal equipment 6 to the heat pump unit 5 through a pipeline; one end of the third valve 11 is connected to the pipeline from the water collector 4 to the heat pump unit 5 through a pipeline, and the other end of the third valve 11 is connected to the pipeline from the heat pump unit 5 to the air conditioning terminal equipment 6 through a pipeline.

Working state: 1. all the first valves 9 are closed, and the second valve 10 and the third valve 11 are opened: the first medium and the second medium are combined into a loop, and after the ground heat exchanger 2 absorbs the ground temperature energy, the first medium and the second medium directly flow to the air conditioning terminal equipment 6 through the third valve 11 for cooling; and flows to the ground heat exchanger 2 through the second valve 10 to form a circulation. 2. All the first valves 9 are opened, the second valve 10 and the third valve 11 are closed: the first medium and the second medium are mutually isolated, heat transfer between the first medium and the second medium is carried out by the heat pump unit 5, the heat exchange capacity is large, high-power heat supply or cold supply can be carried out, and the heat pump unit is suitable for winter and summer.

Note that: the connection points of the second valve 10 and the third valve 11 on the pipeline are positioned on one side of the first valve 9 away from the heat pump unit 5.

The first valve 9, the second valve 10 and the third valve 11 can be used for waterway switching, when the required cooling capacity is small in the early stage and the final stage of summer, all the first valves 9 can be closed, the second valve 10 and the third valve 11 are opened, the heat pump unit 5 does not work, the shallow geothermal energy is utilized for direct cooling, electric energy is saved, and the running cost of the system is greatly reduced. When the heat pump unit 5 is required to work, all the first valves 9 are opened, the second valve 10 and the third valve 11 are closed, and the heat pump unit 5 works, so that high-power heat supply or cold supply is facilitated.

Further, the other end of the second valve 10 is connected to a pipeline from the air conditioner pump 8 to the heat pump unit 5 through a pipeline; one end of the third valve 11 is connected to the pipeline from the ground source pump 7 to the heat pump unit 5 through a pipeline.

The ground source pump 7 and the air conditioner pump 8 can play a role under any working condition, and the reliable operation of the system is ensured.

Further, soft water is adopted for both the first working medium and the second working medium of the heat pump unit 5.

Prevent structure and corruption, system life is long.

Further, the air conditioner further comprises a water softening device 12, an outlet of the water softening device 12 is connected with a low-level water tank 13, an outlet of the low-level water tank 13 is connected with a constant pressure device 14, and an outlet of the constant pressure device 14 is connected to a pipeline between the air conditioner pump 8 and the air conditioner terminal device 6.

Note that: the constant pressure device 14 is of the prior art, and a constant pressure pump may be used.

The air conditioning terminal equipment 6 is convenient to supplement water and fix pressure, the working pressure of the air conditioning terminal equipment 6 is maintained, the heat release and cold release efficiency is guaranteed to be high, and the heat exchange efficiency in the heat pump unit 5 is high.

Further, the outlet of the water softening device 12 is also connected with a high-level water tank 15 through a branch, and the outlet of the high-level water tank 15 is connected to a pipeline from the water collector 4 to the ground source pump 7.

The high-level water tank 15 supplements water for the buried pipe heat exchanger 2 by utilizing the height difference, so that the working pressure of the buried pipe heat exchanger 2 is convenient to maintain, and the heat exchange efficiency is high; and a constant-pressure water pump is not needed, so that equipment investment is saved, and economic benefit is improved.

Further, the well bore 1 is arranged in the water-rich area and extends to the sand gravel stratum, and backfill materials with the lithology same as that of the original stratum of the well bore 1 are backfilled in the well bore 1.

Note that: the original layer of the well bore 1 refers to the area of the well bore 1 before drilling, and the well bore 1 drills the stratum.

The underground water runoff speed of the sand gravel stratum is high, and the single well heat exchange efficiency is high; by backfilling, the radial flow velocity in the well bore 1 is kept consistent with that before drilling, so that the geothermal energy in the well bore 1 is conveniently supplemented.

Further, as shown in fig. 2: the ground heat exchangers 2 are vertically arranged, a plurality of ground heat exchangers 2 are uniformly distributed along the inner side wall of the well bore 1, and at least one ground heat exchanger 2 is positioned on one side of the well bore 1 facing the groundwater runoff direction.

Note that: preferably, the borehole heat exchanger 2 is 3 pieces. Arrows in fig. 2 indicate groundwater runoff directions.

The multiple buried pipe heat exchangers 2 are uniformly loaded, so that the geothermal energy in the well bore 1 is conveniently and fully utilized, and the heat supply and cold supply efficiency is high.

when the temperature difference between the required cooling temperature and the outdoor temperature is not more than 10 ℃, selecting a working state 1: closing all the first valves 9, opening the second valve 10 and the third valve 11, and combining the first medium and the second medium into a loop, wherein the combined medium directly flows to the air-conditioning terminal equipment 6 through the third valve 11 for cooling after being cooled in the buried pipe heat exchanger 2; and flows to the ground heat exchanger 2 through the second valve 10 to form circulation;

when the temperature difference between the required cooling temperature and the outdoor temperature is more than 10 ℃ or the heat supply is required, the working state 2 is selected: all the first valves 9 are opened, the second valve 10 and the third valve 11 are closed, so that the first medium and the second medium are isolated from each other, the first medium circularly flows between the ground heat exchanger 2 and the heat pump unit 5, the second medium circularly flows between the air conditioner terminal equipment 6 and the heat pump unit 5, and heat transfer is carried out between the first medium and the second medium through the heat pump unit 5.

By adopting the cooling and heating method, when the required cooling quantity is small in the early stage and the final stage of summer, the heat pump unit 5 with the highest power consumption does not work, and the shallow geothermal energy is used for directly cooling, so that the running cost of the system is greatly reduced; and the working state is convenient to switch and the operation is simple and convenient.

In the description of the present application, it is to be understood that if descriptive terms indicating orientation, direction or positional relationship are present, such as: the directions or positional relationships indicated in the present specification are directions or positional relationships based on the drawings for convenience of understanding of the present application and for simplification of description, only, and do not indicate or imply that the parts, elements or integers referred to must have a specific direction, be constructed and operated in a specific direction, and thus are not to be construed as limiting the present application.

Further, if an order description term occurs, for example: "first," "second," etc. are used in this specification for convenience in understanding or simplifying the description, for example, in order to distinguish between a plurality of technical features that have the same type or function, but may have to be individually referred to, and this specification may be referred to by a prefix or suffix sequence description term. Thus, no indication or implication of relative importance or an implication of the number of technical features indicated is to be understood. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, if structural relative action description terms are used, for example: "mounted," "connected," "secured," and the like are to be construed broadly, unless otherwise specifically indicated and limited. For example, "mounted," "connected," etc., may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two elements or the interaction relationship between the two elements; the fixing can be integrated fixing or detachable fixing through a fastener; can be directly fixed or fixed through an intermediate medium. The specific meaning of the above descriptive terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances, the context in which it is located, the consistency of the context, etc.

In the present application, if a descriptive term containing an attached or connected meaning, e.g., a first feature "on" or "under" a second feature, is not to be interpreted in a limiting sense unless expressly stated or limited otherwise, e.g., the "on" or "under" can be either the direct contact of the first and second features or the indirect contact of the first and second features via an intermediary. The specific meaning of the above descriptive terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances, the context in which it is located, the consistency of the context, etc.

Further, a first feature "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments, examples, and features of various embodiments, examples described in this specification may be combined and combined by persons skilled in the art without contradiction, and such combination or combination is intended to fall within the broad scope of the application.

While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the present application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art in light of the disclosure of the application as may be acquired within the scope of the disclosure.

Claims

1. A single well multi-buried pipe type buried pipe air conditioning system is characterized in that: the underground water diversion device comprises a well hole (1), a water separator (3), a water collector (4), a heat pump unit (5) and air-conditioning tail end equipment (6), wherein the well hole (1) is arranged in a region with underground water runoff, and a plurality of underground heat exchangers (2) are arranged in the well hole (1); the heat pump unit (5), the water separator (3), the ground heat exchanger (2) and the water collector (4) are sequentially connected in a loop, and a plurality of ground heat exchangers (2) are connected in parallel; and the heat pump unit (5) is connected with air conditioner terminal equipment (6) in a loop mode along the second working medium flow direction of the heat pump unit (5).

2. A Shan Jingduo buried pipe air conditioning system according to claim 1, wherein: a ground source pump (7) is further arranged on a pipeline from the water collector (4) to the heat pump unit (5); an air conditioner pump (8) is further arranged on a pipeline from the air conditioner terminal equipment (6) to the heat pump unit (5).

3. A Shan Jingduo buried pipe air conditioning system according to claim 2, wherein: the heat pump unit further comprises a first valve (9), a second valve (10) and a third valve (11), wherein the first working medium outlet and inlet and the second working medium outlet and inlet of the heat pump unit (5) are respectively provided with at least one first valve (9); one end of the second valve (10) is connected to a pipeline from the heat pump unit (5) to the water separator (3) through a pipeline, and the other end of the second valve (10) is connected to a pipeline from the air conditioner terminal equipment (6) to the heat pump unit (5) through a pipeline; one end of the third valve (11) is connected to the pipeline from the water collector (4) to the heat pump unit (5) through a pipeline, and the other end of the third valve (11) is connected to the pipeline from the heat pump unit (5) to the air conditioner terminal equipment (6) through a pipeline.

4. A Shan Jingduo buried pipe air conditioning system according to claim 3, wherein: the other end of the second valve (10) is connected to a pipeline from the air conditioner pump (8) to the heat pump unit (5) through a pipeline; one end of the third valve (11) is connected to a pipeline from the ground source pump (7) to the heat pump unit (5) through a pipeline.

5. A Shan Jingduo buried pipe air conditioning system according to claim 2, wherein: soft water is adopted for both the first working medium and the second working medium of the heat pump unit (5).

6. A Shan Jingduo buried pipe air conditioning system according to claim 5, wherein: the air conditioner is characterized by further comprising a water softening device (12), wherein an outlet of the water softening device (12) is connected with a low-level water tank (13), an outlet of the low-level water tank (13) is connected with a constant-pressure device (14), and an outlet of the constant-pressure device (14) is connected to a pipeline between the air conditioner pump (8) and the air conditioner tail-end device (6).

7. A Shan Jingduo buried pipe air conditioning system according to claim 6, wherein: the outlet of the water softening device (12) is also connected with a high-level water tank (15) through a branch, and the outlet of the high-level water tank (15) is connected to a pipeline from the water collector (4) to the ground source pump (7).

8. A Shan Jingduo buried pipe air conditioning system according to claim 1, wherein: the well bore (1) is arranged in the water-rich area and extends to the sand gravel stratum, and backfill materials with the lithology same as that of the original stratum of the well bore (1) are backfilled in the well bore (1).

9. A Shan Jingduo buried pipe air conditioning system according to claim 1, wherein: the underground pipe heat exchangers (2) are vertically arranged, a plurality of underground pipe heat exchangers (2) are uniformly distributed along the inner side wall of the well hole (1), and at least one underground pipe heat exchanger (2) is positioned at one side of the well hole (1) opposite to the groundwater runoff direction.

10. A method for cooling and heating, characterized by: a Shan Jingduo buried pipe type air conditioning system according to claim 3 or 4, comprising the steps of:

when the temperature difference between the required cooling temperature and the outdoor temperature is not more than 10 ℃, selecting a working state 1: closing all the first valves (9), opening the second valve (10) and the third valve (11) to enable the first medium and the second medium to be combined into a loop, and after the temperature of the combined medium is reduced in the ground heat exchanger (2), directly flowing to air conditioning terminal equipment (6) through the third valve (11) to release cold; and flows to the ground heat exchanger (2) through the second valve (10) to form circulation;

when the temperature difference between the required cooling temperature and the outdoor temperature is more than 10 ℃ or the heat supply is required, the working state 2 is selected: all the first valves (9) are opened, the second valve (10) and the third valve (11) are closed, so that the first medium and the second medium are isolated from each other, the first medium circularly flows between the ground heat exchanger (2) and the heat pump unit (5), the second medium circularly flows between the air conditioner tail end equipment (6) and the heat pump unit (5), and heat transfer is carried out between the first medium and the second medium through the heat pump unit (5).