Soil source and dry heat type air source heat pump collaborative heat supply system

Abstract

The invention discloses a soil source and dry heat type air source heat pump cooperative heat supply system, which relates to the technical field of cooperative heat supply, and comprises a heat pump unit with a water inlet end connected with a unit water inlet pipe and a water outlet end connected with a unit water outlet pipe; the terrestrial heat buried pipe is communicated with the heat pump unit through a unit water outlet pipe and is further connected with a terrestrial heat buried pipe water outlet pipe, and the other end of the terrestrial heat buried pipe water outlet pipe is communicated with the unit water inlet pipe; the surface air cooler is communicated with the heat pump unit through a unit water inlet pipe, the surface air cooler is further connected with a surface air cooler water inlet pipe, the other end of the surface air cooler water inlet pipe is communicated with the unit water outlet pipe, and bypass pipes are arranged on the surface air cooler water inlet pipe and the terrestrial heat buried pipe water outlet pipe; the circulating water pump is arranged on the unit water inlet pipe; one end of the heat storage bypass pipe is arranged on the unit water inlet pipe and located between the heat pump unit and the circulating water pump, and the other end of the heat storage bypass pipe is arranged on the unit water outlet pipe and located between the connection point of the surface air cooler water inlet pipe and the unit water outlet pipe and the heat pump unit.

Description

Technical Field

[0001] The present invention relates to the technical field of collaborative heating, and in particular to a soil source and dry heat air source heat pump collaborative heating system. Background Art

[0002] With the implementation of my country's "dual carbon" strategy, the traditional coal-based heating model is shifting to a new clean energy heating model. Building a new heating system with new energy as the main body is an important means and the only way to achieve the "dual carbon" goals.

[0003] Ground-source heat pumps and air-source heat pumps are two commonly used clean energy heating methods. Ground-source heat pumps offer high efficiency and stable system operation, but they require pre-installed wells and geothermal pipes, which requires significant land. Generally speaking, a horizontally buried ground-source heat pump system typically requires several times the floor area of the house, resulting in significant initial equipment investment costs. Furthermore, ground-source heat pumps can easily lead to soil thermal imbalance. Over the years of heating, heat extraction outpaces heat recovery, leading to increasingly low temperatures near the geothermal pipes. This can cause the system's efficiency to decline year by year, or even to become inoperable. Air-source heat pumps, on the other hand, utilize modular installation methods for flexibility and are widely used in clean energy heating projects in northern China. However, the efficiency of air-source heat pumps decreases as outdoor temperatures drop, particularly in low-temperature, high-humidity conditions. Air-source heat pumps frequently frost, consume high defrosting energy, and experience low heating efficiency.

[0004] The utility model patent with publication number "CN217235902U" and name "Air source, soil source composite heat pump system" operates the soil source and air source in parallel. Running the air source heat pump in the cooling season to store heat in the soil can alleviate the soil thermal imbalance. However, for a single heating system, running the air source heat pump in the non-heating season only for soil heat storage wastes energy.

[0005] The utility model patent with publication number "CN219390136U" and name "A soil source and air source collaborative heat pump system for air conditioning" realizes heating by connecting soil source and air source heat pumps in parallel, and realizes independent operation and parallel collaborative operation of soil source heat pump and air source heat pump in cooling season. The air source heat pump is operated in cooling season to store heat for the soil and improve the thermal imbalance of the soil. It is also only suitable for combined heating and cooling systems, and is not suitable for large-scale centralized heating systems with only heating. At the same time, the water outlet of the buried pipe is used to preheat the air to improve the efficiency of the air source heat pump, but a low-energy defrosting solution is not proposed.

[0006] Therefore, a soil source and dry air source heat pump coordinated heating system is proposed. Summary of the Invention

[0007] The object of the present invention is to solve the problem that the existing heating methods cannot maintain a high heating efficiency while keeping the cost low, and a soil source and dry heat air source heat pump collaborative heating system is proposed.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A soil source and dry heat air source heat pump collaborative heating system, comprising: A heat pump unit, with a unit inlet pipe connected to its water inlet end and a unit outlet pipe connected to its water outlet end; A geothermal buried pipe, which is connected to the heat pump unit through the unit outlet pipe, and is also connected to a geothermal buried pipe outlet pipe for extracting or releasing heat from the soil. The other end of the geothermal buried pipe outlet pipe is connected to the unit inlet pipe; A surface cooler, which is connected to the heat pump unit through the unit inlet pipe for supplying or absorbing heat to the outside. The surface cooler is also connected to a surface cooler inlet pipe, and the other end of the surface cooler inlet pipe is connected to the unit outlet pipe. A surface cooler defrost bypass pipe for connecting the two is provided between the surface cooler inlet pipe and the geothermal buried pipe outlet pipe; A circulating water pump, which is arranged on the unit inlet pipe and located between the connection point of the unit inlet pipe and the geothermal buried pipe outlet pipe and the heat pump unit for driving the water circulation; A heat storage bypass pipe, with one end arranged on the unit inlet pipe and located between the heat pump unit and the circulating water pump, and the other end arranged on the unit outlet pipe and located between the connection point of the surface cooler inlet pipe and the unit outlet pipe and the heat pump unit; An electric valve one, which is arranged on the geothermal buried pipe outlet pipe and located between the connection point of the geothermal buried pipe outlet pipe and the unit inlet pipe and the connection point of the geothermal buried pipe outlet pipe and the surface cooler defrost bypass pipe; An electric valve two, which is arranged on the surface cooler defrost bypass pipe; An electric valve three, which is arranged on the heat storage bypass pipe; An electric valve four, which is arranged on the surface cooler inlet pipe and located between the connection point of the surface cooler inlet pipe and the unit outlet pipe and the connection point of the surface cooler inlet pipe and the surface cooler defrost bypass pipe; An electric valve five, which is arranged on the unit outlet pipe and located between the unit outlet pipe and the connection point of the surface cooler inlet pipe and the geothermal buried pipe.

[0009] Preferably, the circulating water pump drives the water flow to circulate between the heat pump unit, the geothermal buried pipe, the surface cooler and the heat storage bypass pipe. By controlling the opening and closing states of the electric valve one, the electric valve two, the electric valve three, the electric valve four and the electric valve five, different working modes and heat management of the system are realized.

[0010] Preferably, when the dry-heat type air source heat pump operates alone, the opening and closing states of the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, and the fifth electric valve are controlled through the following steps to achieve this mode: Open the fourth electric valve; Close the first electric valve; Close the second electric valve; Close the third electric valve; Close the fifth electric valve.

[0011] Preferably, when the ground source heat pump operates alone, the opening and closing states of the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, and the fifth electric valve are controlled through the following steps to achieve this mode; Open the first electric valve; Open the fifth electric valve; Close the second electric valve; Close the third electric valve; Close the fourth electric valve.

[0012] Preferably, when the system is in the cooperative operation mode of the ground source and the dry-heat type air source heat pump, the opening and closing states of the electric valves are controlled through the following steps to achieve this mode: Open the first electric valve; Open the fourth electric valve; Open the fifth electric valve; Close the second electric valve; Close the third electric valve.

[0013] Preferably, when the system is in the defrosting operation, the opening and closing states of the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, and the fifth electric valve are controlled through the following steps to achieve this mode: Open the first electric valve and the second electric valve; Close the third electric valve; Close the fourth electric valve; Open the fifth electric valve; At the same time, close the fan of the surface cooler.

[0014] Preferably, when the system performs ground source heat regeneration, the opening and closing states of the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, and the fifth electric valve are controlled through the following steps to achieve this mode: Open the second electric valve; Open the third electric valve; Open the fifth electric valve; Close the first electric valve; Close the fourth electric valve.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention reasonably integrates a surface cooler into a ground source heat pump system, constructs a collaborative heating system of a ground source and a dry heat air source heat pump, and introduces a dry heat air source heat pump unit, thereby effectively reducing the number of geothermal buried pipes, alleviating the problems of large floor area and high initial investment traditionally associated with ground source heat pump systems, and at the same time endowing the system with higher flexibility. It should be noted that although the prior art has explored the collaborative operation mode of ground source and air source heat pumps, it has not touched on the core point of efficiency optimization in the collaborative process. The control system of the present invention can calculate the operating efficiency of the two in real time by intelligently collecting data on ambient temperature, heating capacity and power consumption of the ground source heat pump and the air source heat pump, ensuring that while maintaining an excellent heating effect, the unit with higher efficiency is preferentially started and the unit with lower efficiency is timely deactivated, ensuring that the entire system is always in the optimal efficiency state and realizing the maximum utilization of energy.

[0016] 2. In dealing with the common defrosting problem in air source heat pump systems, the present invention proposes to use a small part of the geothermal buried pipe circulating water bypassed through the surface cooler for defrosting. This process does not require additional power consumption and realizes true low-energy defrosting. In contrast, in the prior art, air source heat pump systems need to consume a large amount of electric energy to drive the compressor and circulation pump to complete the defrosting task. The present invention not only greatly reduces the defrosting energy consumption, but also during the defrosting period, the heat pump unit can still continuously supply heat in the ground source heat pump mode, ensuring the continuity and stability of the system heating and being beneficial to improving the user experience of the heating system.

[0017] 3. Aiming at the problem of summer soil heat imbalance, the present invention designs ground source heat regeneration. By driving water to circulate between the surface cooler and the geothermal buried pipes through a circulation pump, the heat absorbed from the surface cooler is transferred to the geothermal buried pipes, and then the outdoor heat is transferred to the soil, thereby improving the heat balance state of the soil. Compared with the method in the prior art that requires starting the air source heat pump unit for geothermal buried pipe heat regeneration, the present invention only needs to operate the circulation pump and the surface cooler fan, and can achieve the adjustment of soil heat imbalance with extremely low power consumption. Especially for a system with only a heating function, it avoids unnecessary power waste and demonstrates extremely high energy efficiency ratio and environmental friendliness. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall process of a collaborative heating system of a ground source and a dry heat air source heat pump proposed by the present invention; Figure 2 It is a schematic diagram of the process of Scenario 1 in a collaborative heating system of a ground source and a dry heat air source heat pump proposed by the present invention; Figure 3 It is a schematic diagram of the process of Scenario 2 in a collaborative heating system of a ground source and a dry heat air source heat pump proposed by the present invention; Figure 4Schematic diagram of process flow in Scenario 3 of a soil-source and dry-heat air-source heat pump collaborative heating system proposed by the present invention; Figure 5 Schematic diagram of process flow in Scenario 4 of a soil-source and dry-heat air-source heat pump collaborative heating system proposed by the present invention; Figure 6 Schematic diagram of process flow in Scenario 5 of a soil-source and dry-heat air-source heat pump collaborative heating system proposed by the present invention.

[0019] In the figure: 1. Heat pump unit; 2. Geothermal buried pipe; 3. Surface cooler; 4. Circulation water pump; 5-1. Electric valve 1; 5-2. Electric valve 2; 5-3. Electric valve 3; 5-4. Electric valve 4; 5-5. Electric valve 5; 6. Unit outlet pipe; 7. Unit inlet pipe; 8. Heat storage bypass pipe; 9. Geothermal buried pipe outlet pipe; 10. Surface cooler inlet pipe; 11. Surface cooler defrost bypass pipe. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] Refer to Figure 1 , a soil-source and dry-heat air-source heat pump collaborative heating system, including a heat pump unit 1, a geothermal buried pipe 2, a surface cooler 3, a circulation water pump 4, an electric valve 1 5-1, an electric valve 2 5-2, an electric valve 3 5-3, an electric valve 4 5-4, an electric valve 5 5-5, a unit outlet pipe 6, a unit inlet pipe 7, a heat storage bypass pipe 8, a geothermal buried pipe outlet pipe 9, and a surface cooler inlet pipe 10.

[0023] Among them, for the heat pump unit 1, the water inlet end is connected to the unit inlet pipe 7, and the water outlet end is connected to the unit outlet pipe 6; The geothermal buried pipe 2 is connected to the heat pump unit 1 through the unit outlet water pipe 6, and is also connected to the geothermal buried pipe outlet water pipe 9 for extracting or releasing heat from the soil. The other end of the geothermal buried pipe outlet water pipe 9 is connected to the unit inlet water pipe 7; The surface cooler 3 is connected to the heat pump unit 1 through the unit inlet water pipe 7 for supplying or absorbing heat to the outside. The surface cooler 3 is also connected to the surface cooler inlet water pipe 10. The other end of the surface cooler inlet water pipe 10 is connected to the unit outlet water pipe 6. A surface cooler defrost bypass pipe 11 for connecting the two is provided between the surface cooler inlet water pipe 10 and the geothermal buried pipe outlet water pipe 9; The circulating water pump 4 is arranged on the unit inlet water pipe 7 and between the connection point of the unit inlet water pipe 7 and the geothermal buried pipe outlet water pipe 9 and the heat pump unit 1 for driving the water circulation; The heat storage bypass pipe 8 has one end arranged on the unit inlet water pipe 7 and between the heat pump unit 1 and the circulating water pump 4, and the other end arranged on the unit outlet water pipe 6 and between the connection point of the surface cooler inlet water pipe 10 and the unit outlet water pipe 6 and the heat pump unit 1; The first electric valve 5-1 is arranged on the geothermal buried pipe outlet water pipe 9 and between the connection point of the geothermal buried pipe outlet water pipe 9 and the unit inlet water pipe 7 and the connection point of the geothermal buried pipe outlet water pipe 9 and the surface cooler defrost bypass pipe 11; The second electric valve 5-2 is arranged on the surface cooler defrost bypass pipe 11; The third electric valve 5-3 is arranged on the heat storage bypass pipe 8; The fourth electric valve 5-4 is arranged on the surface cooler inlet water pipe 10 and between the connection point of the surface cooler inlet water pipe 10 and the unit outlet water pipe 6 and the connection point of the surface cooler inlet water pipe 10 and the surface cooler defrost bypass pipe 11; The fifth electric valve 5-5 is arranged on the unit outlet water pipe 6 and between the unit outlet water pipe 6 and the connection point of the surface cooler inlet water pipe 10 and the geothermal buried pipe 2.

[0024] By controlling the opening and closing states of the first electric valve 5-1, the second electric valve 5-2, the third electric valve 5-3, the fourth electric valve 5-4 and the fifth electric valve 5-5, different working modes and heat management of the system are realized.

[0025] The present invention has the following usage scenarios.

[0026] Scenario 1: The dry heat type air source heat pump operates independently for heating. In the initial and final stages of heating, and when the outdoor temperature is higher than 5°C, and the air source heat pump hardly defrosts, so it has a high operating efficiency and no energy consumption caused by defrosting.

[0027] Refer to Figure 2, open the electric valve four 5-4 to allow the circulating water to directly flow from the unit outlet pipe 6 to the inlet pipe 10 of the surface cooler or receive the circulating water from the inlet pipe 10 of the surface cooler; close the electric valve one 5-1 to block the water flow path from the geothermal buried pipe outlet pipe 9 to the unit inlet pipe 7; close the electric valve two 5-2 to block the water flow path in the surface cooler defrost bypass pipe 11 to prevent it from interfering with the normal heating process; close the electric valve three 5-3 to block the water flow path in the heat storage bypass pipe 8; close the electric valve five 5-5 to block the water flow in the unit outlet pipe 6 that flows to the geothermal buried pipe 2, so that the system focuses on taking heat from the outdoor air. The system working process is as shown by the thick solid line in Figure 2 The middle thick solid line shows.

[0028] The circulating water in the unit inlet pipe 7 is cooled after heat exchange through the heat pump unit 1, and then the circulating water enters the surface cooler 3 through the unit outlet pipe 6. The circulating water takes heat from the outdoor air and is heated up through the surface cooler 3. The heated circulating water enters the heat pump unit 1 again through the unit inlet pipe 7 for heat exchange. In this order, the operation path of the circulating water is: heat pump unit 1 (temperature reduction) → unit outlet pipe 6 → surface cooler 3 (outdoor temperature rise) → unit inlet pipe 7 → heat pump unit 1. The heat exchange cycle in Scenario 1 is completed through this path.

[0029] Scenario 2: The soil source heat pump operates alone for heating. In the middle stage of heating, when the outdoor temperature is lower than 5°C and the efficiency of the soil source heat pump is higher than that of the air source heat pump, the soil source heat pump operates alone for heating at this time.

[0030] Open the electric valve one 5-1 to allow the heated circulating water flowing out from the geothermal buried pipe outlet pipe 9 to enter the heat pump unit 1 through the unit inlet pipe 7 for heat exchange; open the electric valve five 5-5 to ensure that the cooled circulating water after preliminary heat exchange through the heat pump unit 1 can smoothly enter the geothermal buried pipe 2 to absorb the soil heat source; close the electric valve two 5-2 to block the water flow in the surface cooler defrost bypass pipe 11 to prevent it from interfering with the direct heating process of the ground heat source; close the electric valve three 5-3 to block the water flow in the heat storage bypass pipe 8 to ensure that all the circulating water participates in the ground heat source heat exchange process; close the electric valve four 5-4 to prevent the circulating water from directly flowing from the unit outlet pipe 6 into the surface cooler 3 and ensure the independence of the ground heat source heating mode. The system working process is as shown by the thick solid line in Figure 3 The middle thick solid line shows.

[0031] The circulating water enters the heat pump unit 1 through the unit inlet pipe 7, exchanges heat and cools down, then enters the geothermal buried pipe 2 through the unit outlet pipe 6. The circulating water extracts heat from the soil through the geothermal buried pipe 2 and warms up. The warmed circulating water enters the heat pump unit 1 again through the geothermal buried pipe outlet pipe 9 and the unit inlet pipe 7 for heat exchange, completing one heat exchange cycle. Taking this sequence as a cycle, the running path of the circulating water is: heat pump unit 1 (cooling down) → geothermal buried pipe 2 (warming up the soil) → geothermal buried pipe outlet pipe 9 → unit inlet pipe 7 → heat pump unit 1, and the heat exchange cycle under Scenario 2 is completed through this path.

[0032] Scenario 3: The scenario of the combined operation of a ground source and a dry - type air source heat pump for heating. In a heating area with limited land area, a single ground source heating system can no longer meet the actual heating demand. Therefore, the ground source and the dry - type air source heat pump are operated in combination to maintain heating.

[0033] Open the first electric valve 5 - 1 to allow the circulating water to flow into the heat pump unit 1 through the unit inlet pipe 7 for heat exchange and cooling down; open the fourth electric valve 5 - 4 so that the cooled circulating water after heat exchange in the heat pump unit 1 can be diverted into the surface cooler 3 for auxiliary heating using the air source; open the fifth electric valve 5 - 5 to allow another part of the cooled circulating water to enter the geothermal buried pipe 2 to absorb heat from the soil; close the second electric valve 5 - 2 to prevent the circulating water from directly flowing back to the heat pump unit 1 without being heated by the surface cooler 3 or the geothermal buried pipe 2; close the third electric valve 5 - 3 to block the water flow in the heat storage bypass pipe 8 and ensure that all circulating water participates in the combined heating process. The system working process is as Figure 4 shown by the thick solid line in the figure.

[0034] The circulating water enters the heat pump unit 1 through the unit inlet pipe 7, exchanges heat and cools down, then enters the surface cooler 3 and the geothermal buried pipe 2 through the unit outlet pipe 6 via the fourth electric valve 5 - 4 and the fifth electric valve 5 - 5 respectively. The circulating water simultaneously extracts heat and warms up through the surface cooler 3 and the geothermal buried pipe 2. The warmed circulating water converges again to the unit inlet pipe 7 and then enters the heat pump unit 1 for heat exchange, completing one heat exchange cycle. Taking this sequence as a cycle, the running path of the circulating water is: heat pump unit 1 (cooling down) → unit outlet pipe 6 → (surface cooler 3, geothermal buried pipe 2) (warming up) → unit inlet pipe 7 → heat pump unit 1. (surface cooler 3, geothermal buried pipe 2) indicates a parallel setting, and the heat exchange cycle under Scenario 3 is completed through this path.

[0035] In the present invention, an air cooler 3 is added to the ground source heat pump system to form a collaborative heating system of ground source and dry heat type air source heat pumps. The addition of the dry heat type air source heat pump unit 1 can reduce the number of geothermal buried pipes 2, solve the problems of large floor area and high initial investment of the ground source heat pump system, and increase the flexibility of the system. In the prior art, only the implementation method of the collaborative operation of the ground source and air source heat pumps was proposed, without describing the efficiency problem in the process of their collaborative operation. In the present invention, a control system is provided. The control system calculates the operation efficiency of the ground source and dry heat type air source heat pumps in real time by collecting the ambient temperature, the heat output and power consumption of the ground source heat pump, and the heat output and power consumption of the air source heat pump. On the premise of ensuring the heating effect, the unit with high operation efficiency is preferentially started and the unit with low operation efficiency is preferentially stopped, so that the system always maintains the best efficiency.

[0036] Scenario 4: The air source heat pump operates for heating during defrosting. The PLC control program detects the ambient temperature and the fin temperature of the air cooler 3. When the defrosting condition is reached, the electric valve 1 5-1 and the electric valve 2 5-2 are opened to a preset partial opening degree, and this opening degree is automatically adjusted by the programmable logic controller PLC of the system according to the number of air coolers 3 entering the defrost state. The electric valve 3 5-3 is closed to block the path of the circulating water through the heat storage bypass pipe 8, ensuring that all the circulating water participating in defrosting flows through the geothermal buried pipe 2 or the defrost bypass pipe 11 of the air cooler 3; the electric valve 4 5-4 is closed to prevent the circulating water from directly flowing from the unit outlet pipe 6 into the air cooler 3, ensuring the independence of the defrosting process; the fan of the air cooler 3 is closed to reduce the influence of air flow on the defrosting effect. The working process of the system is as Figure 5 shown by the thick solid line in the figure.

[0037] Furthermore, the fan of the air cooler 3 is closed, and the electric valve 1 5-1 and the electric valve 2 5-2 are partially opened, and their opening ratios are controlled by the system PLC according to the number of air coolers 3 entering defrosting. It should be noted that the opening degree needs to meet the condition that the heat carried by the circulating water in the air cooler 3 circuit can meet the defrosting requirements. In the prior art, the air source heat pump system needs to consume a large amount of electric energy to drive the compressor and the circulating pump to meet the defrosting requirements, which will cause additional energy consumption and increase the use cost. However, in this system, a small part of the circulating water of the geothermal buried pipe 2 is used for defrosting through the bypass, and the defrosting energy consumption is greatly reduced. Moreover, during the defrosting process, the heat pump unit 1 still continues to heat in the form of a ground source heat pump, realizing simultaneous defrosting and heating and ensuring the stability of the system heating.

[0038] In the present invention, a small part of the geothermal buried pipe 2 is bypassed, and the circulating water in the geothermal buried pipe 2 enters the surface cooler 3 for defrosting, without the need to additionally increase power-consuming equipment, achieving low-energy consumption defrosting. Compared with the commonly used air source heat pump system at present, a large amount of electric energy is required to drive the compressor and the circulating pump to meet the defrosting requirements. In contrast, the defrosting energy consumption of this system is greatly reduced, and during the defrosting process, the heat pump unit 1 still continues to supply heat in the form of a ground source heat pump, realizing simultaneous defrosting and heating, which is beneficial to increasing the heating stability of the system.

[0039] Scenario Five: Ground source heat regeneration. As a heating method, ground source heat supply continuously consumes the geothermal source. If heat is only extracted from the soil without heat regeneration, it will cause soil heat imbalance and make the heating effect decrease year by year. Therefore, it is necessary to recharge heat into the soil in summer to achieve sustainable heating.

[0040] Open the second electric valve 5-2 to allow the circulating water flowing out of the geothermal buried pipe outlet pipe 9 to pass through the defrost bypass pipe 11. In the surface cooler 3, the circulating water is heated by using the heat of the outdoor air; open the third electric valve 5-3 to enable the circulating water heated in the surface cooler 3 to bypass the heat pump unit 1 through the heat storage bypass pipe 8 and directly enter the unit outlet pipe 6. The aim is to directly transfer the heat absorbed in the surface cooler 3 to the geothermal buried pipe 2, rather than first exchanging heat through the heat pump unit 1; open the fifth electric valve 5-5 to ensure that the heated circulating water can smoothly enter the geothermal buried pipe 2 and transfer the heat absorbed from the surface cooler 3 to the soil around the geothermal buried pipe 2, thereby improving the soil heat imbalance condition; close the first electric valve 5-1 to prevent the circulating water from directly entering the heat pump unit 1 without being heated in the surface cooler 3; close the fourth electric valve 5-4 to avoid the circulating water directly flowing from the unit outlet pipe 6 into the surface cooler 3 and ensure the independence of the soil heat imbalance improvement mode. The system working process is as Figure 6 shown by the thick solid line in the figure.

[0041] The circulating water enters the surface cooler 3 through the geothermal buried pipe outlet pipe 9, the second electric valve 5-2, and the surface cooler inlet pipe 10. The circulating water takes heat from the outdoor air and is heated in the surface cooler 3. The heated circulating water enters the geothermal buried pipe 2 through the unit inlet pipe 7, the heat storage bypass pipe 8, the unit outlet pipe 6, and the fifth electric valve 5-5, transferring the heat absorbed from the surface cooler to the geothermal buried pipe 2, thereby transferring the heat in the outdoor environment to the soil near the geothermal buried pipe 2 and improving the soil heat imbalance condition. Taking this order as the cycle, the running path of the circulating water is: geothermal buried pipe 2 → geothermal buried pipe outlet pipe 9 → surface cooler inlet pipe 10 → surface cooler 3 → unit inlet pipe 7 → heat storage bypass pipe 8 → unit outlet pipe 6 → geothermal buried pipe 2, and the heat regeneration cycle under Scenario Five is completed through this path.

[0042] In the prior art, the soil-source and air-source collaborative system needs to operate the air-source heat pump unit for heat recovery of the geothermal buried pipe 2. For a single-heating system, a large amount of electric energy will be wasted. However, the present invention only needs to operate the circulation pump and the fan of the surface cooler 3, and a small amount of electric energy consumption can improve the soil heat imbalance condition. From the perspective of long-term use, it is completely within the acceptable range, which is beneficial to maintaining the stability of the system heating.

[0043] In summer, the present invention circulates the circulating water between the surface cooler 3 and the geothermal buried pipe 2, and transfers the heat absorbed from the surface cooler 3 to the geothermal buried pipe 2, so as to transfer the heat in the outdoor environment to the soil near the geothermal buried pipe 2, which is beneficial to improving the soil heat imbalance condition. In the prior art, the soil-source and air-source collaborative system needs to operate the air-source heat pump unit 1 for heat recovery of the geothermal buried pipe 2. For a single-heating system, a large amount of electric energy will be wasted. However, the present invention only needs to operate the circulation pump 4 and the fan of the surface cooler 3, and a small amount of electric energy consumption can improve the soil heat imbalance condition.

[0044] In this application, the overall heat source operation efficiency of the system is the total COP.

[0045]

[0046]

[0047]

[0048] Every half hour is used as a control period to calculate the COP of the two. On the premise of ensuring the heating demand, preferably select or adjust the unit with higher operation efficiency to achieve the purpose of energy saving.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A soil source and dry heat type air source heat pump collaborative heating system, characterized in that Comprising: A heat pump unit (1), with its water inlet end connected to a unit water inlet pipe (7) and its water outlet end connected to a unit water outlet pipe (6); A geothermal buried pipe (2), which is connected to the heat pump unit (1) through the unit water outlet pipe (6), and is also connected to a geothermal buried pipe water outlet pipe (9) for extracting or releasing heat from the soil. The other end of the geothermal buried pipe water outlet pipe (9) is connected to the unit water inlet pipe (7); A surface cooler (3), which is connected to the heat pump unit (1) through the unit water inlet pipe (7) for supplying or absorbing heat to the outside. The surface cooler (3) is also connected to a surface cooler water inlet pipe (10). The other end of the surface cooler water inlet pipe (10) is connected to the unit water outlet pipe (6). A surface cooler defrost bypass pipe (11) for connecting the two is provided between the surface cooler water inlet pipe (10) and the geothermal buried pipe water outlet pipe (9); A circulating water pump (4), which is arranged on the unit water inlet pipe (7) and is located between the connection point of the unit water inlet pipe (7) and the geothermal buried pipe water outlet pipe (9) and the heat pump unit (1) for driving the water circulation; A heat storage bypass pipe (8), with one end arranged on the unit water inlet pipe (7) and located between the heat pump unit (1) and the circulating water pump (4), and the other end arranged on the unit water outlet pipe (6) and located between the connection point of the surface cooler water inlet pipe (10) and the unit water outlet pipe (6) and the heat pump unit (1); An electric valve one (5-1), which is arranged on the geothermal buried pipe water outlet pipe (9) and is located between the connection point of the geothermal buried pipe water outlet pipe (9) and the unit water inlet pipe (7) and the connection point of the geothermal buried pipe water outlet pipe (9) and the surface cooler defrost bypass pipe (11); An electric valve two (5-2), which is arranged on the surface cooler defrost bypass pipe (11); An electric valve three (5-3), which is arranged on the heat storage bypass pipe (8); An electric valve four (5-4), which is arranged on the surface cooler water inlet pipe (10) and is located between the connection point of the surface cooler water inlet pipe (10) and the unit water outlet pipe (6) and the connection point of the surface cooler water inlet pipe (10) and the surface cooler defrost bypass pipe (11); An electric valve five (5-5), which is arranged on the unit water outlet pipe (6) and is located between the unit water outlet pipe (6) and the connection point of the surface cooler water inlet pipe (10) and the geothermal buried pipe (2); 2. The soil source and dry heat type air source heat pump collaborative heating system according to claim 1, characterized in that, The circulating water pump (4) drives the water flow to circulate among the heat pump unit (1), the geothermal buried pipe (2), the surface cooler (3) and the heat storage bypass pipe (8). By controlling the opening and closing states of the electric valve one (5-1), the electric valve two (5-2), the electric valve three (5-3), the electric valve four (5-4) and the electric valve five (5-5), different working modes and heat management of the system are realized.

3. The soil source and dry heat type air source heat pump collaborative heating system according to claim 1 or 2, characterized in that, When the dry heat type air source heat pump operates alone, the opening and closing states of the electric valve one (5-1), the electric valve two (5-2), the electric valve three (5-3), the electric valve four (5-4) and the electric valve five (5-5) are controlled through the following steps to achieve this mode: Open the electric valve four (5-4); Close the electric valve one (5-1); Close the electric valve two (5-2); Close the electric valve three (5-3); Close the electric valve five (5-5).

4. A soil source and dry heat air source heat pump collaborative heating system according to claim 1 or 2, characterized in that, When the ground source heat pump operates alone, control the opening and closing states of the first electric valve (5-1), the second electric valve (5-2), the third electric valve (5-3), the fourth electric valve (5-4) and the fifth electric valve (5-5) through the following steps to achieve this mode; Open the first electric valve (5-1); Open the fifth electric valve (5-5); Close the second electric valve (5-2); Close the third electric valve (5-3); Close the fourth electric valve (5-4).

5. A soil-source and dry-heat air-source heat pump collaborative heating system according to claim 1 or 2, characterized in that, When the system is in the coordinated operation mode of the ground source and the dry heat type air source heat pump, control the opening and closing states of the electric valves through the following steps to achieve this mode: Open the first electric valve (5-1); Open the fourth electric valve (5-4); Open the fifth electric valve (5-5); Close the second electric valve (5-2); Close the third electric valve (5-3).

6. A soil-source and dry-heat air-source heat pump collaborative heating system according to claim 1 or 2, characterized in that When the system is in the defrosting operation, control the opening and closing states of the first electric valve (5-1), the second electric valve (5-2), the third electric valve (5-3), the fourth electric valve (5-4) and the fifth electric valve (5-5) through the following steps to achieve this mode: Open the first electric valve (5-1) and the second electric valve (5-2); Close the third electric valve (5-3); Close the fourth electric valve (5-4); Open the fifth electric valve (5-5); At the same time, close the fan of the surface cooler (3).

7. A soil-source and dry-heat air-source heat pump collaborative heating system according to claim 1 or 2, characterized in that, When the system conducts ground source heat regeneration, control the opening and closing states of the first electric valve (5-1), the second electric valve (5-2), the third electric valve (5-3), the fourth electric valve (5-4) and the fifth electric valve (5-5) through the following steps to achieve this mode: Open the second electric valve (5-2); Open the third electric valve (5-3); Open the fifth electric valve (5-5); Close the first electric valve (5-1); Close the fourth electric valve (5-4).

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