Photovoltaic photo-thermal and ground-source heat pump air conditioning structure, system and control method thereof

Abstract

This application discloses a photovoltaic-thermal-ground source heat pump air conditioning structure, system, and control method, belonging to the field of air conditioning. A water inlet passage is provided between the water pump and the ground source heat pump unit; a water outlet passage is provided between the ground source heat pump unit and the buried pipe heat exchanger. When the first water inlet passage is connected, the water from the water pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, the water from the water pump exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit; when the first water outlet passage is connected, the water from the ground source heat pump unit directly enters the buried pipe heat exchanger; when the second water outlet passage is connected, the water from the ground source heat pump unit exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit. This application's solution, by controlling the opening and closing of the first water inlet passage, second water inlet passage, first water outlet passage, and second water outlet passage, can combine the characteristics of the photovoltaic system and the ground source heat pump to reduce energy loss and improve system efficiency while ensuring user comfort.

Description

Technical Field

[0001] This application relates, particularly to the field of air conditioning technology, to a photovoltaic-thermal-ground source heat pump air conditioning structure, system, and control method thereof. Background Technology

[0002] Under the dual pressures of surging global energy demand and climate change, the development and application of clean energy technologies has become a global consensus. Photovoltaic (PV) systems and ground source heat pumps (GSHP), as two highly efficient and environmentally friendly energy utilization methods, have shown great potential in power supply and thermal management, respectively. However, when operating independently, PV systems suffer from reduced power generation efficiency due to temperature rise, limiting the efficiency and reliability of energy utilization. The electricity generated by PV systems must match demand; otherwise, energy waste will occur. Ground source heat pump systems are characterized by high efficiency and stability, consuming less energy than traditional air conditioning systems. Their coupling with photovoltaic / thermal panels (PV / T panels) further enhances the system's environmental friendliness. However, in traditional PV / thermal-source heat pump air conditioning systems, the circulating water used for cooling the PV / T panels in cooling mode cannot enter the unit's condenser for refrigeration; it can only be used for domestic hot water or thermal storage, which to some extent causes energy waste in the ground source-side circulating pump. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, this application provides a photovoltaic-thermal-ground source heat pump air conditioning structure, system and control method to solve the problem that in the traditional photovoltaic-thermal-ground source heat pump air conditioning system, the circulating water used for cooling the PV / T panels in the cooling mode cannot enter the unit condenser for cooling and can only be used for domestic hot water or heat storage, which to some extent causes energy waste of the ground source side circulating pump.

[0004] The technical solution adopted by this application to solve its technical problem is:

[0005] In a first aspect, a photovoltaic thermal-ground source heat pump air conditioning structure is provided, including: a buried pipe heat exchanger, a water pump, a ground source heat pump unit, and a photovoltaic thermal panel;

[0006] The buried pipe heat exchanger is connected to the water pump, and the ground source heat pump unit exchanges heat with the user side.

[0007] A water inlet passage is provided between the water pump and the ground source heat pump unit; a water outlet passage is provided between the ground source heat pump unit and the buried pipe heat exchanger.

[0008] The water inlet passage includes a first water inlet passage and / or a second water inlet passage; the water outlet passage includes a first water outlet passage and / or a second water outlet passage.

[0009] When the first water inlet passage is connected, the water from the water pump directly enters the ground source heat pump unit;

[0010] When the second water inlet passage is connected, the water from the pump exchanges heat with the photovoltaic thermal panel and then enters the ground source heat pump unit.

[0011] When the first water outlet passage is connected, the water from the ground source heat pump unit directly enters the buried pipe heat exchanger.

[0012] When the second water outlet passage is connected, the water from the ground source heat pump unit exchanges heat with the photovoltaic thermal panel and then enters the ground source heat pump unit.

[0013] Furthermore, the water pump includes a first water pump, a second water pump, and a mixing valve;

[0014] The first water pump and the second water pump are connected in parallel;

[0015] The first water pump is powered by the power grid;

[0016] The second water pump is powered by photovoltaic cells;

[0017] Water from the first and second water pumps enters the inlet passage after passing through the mixing valve.

[0018] Secondly, a photovoltaic-thermal-ground source heat pump air conditioning system is provided, comprising: the aforementioned photovoltaic-thermal-ground source heat pump air conditioning structure.

[0019] Thirdly, a control method for a photovoltaic-thermal-ground source heat pump air conditioning system is provided, comprising: applying to the aforementioned air conditioning system, wherein the water inlet passage of the air conditioning system includes a first water inlet passage and a second water inlet passage, and the water outlet passage of the air conditioning system includes a first water outlet passage and a second water outlet passage; the method includes:

[0020] Determine the air conditioner's operating mode, which includes a cooling mode and a heating mode;

[0021] The target opening status of the water inlet passage and the water outlet passage is determined based on the air conditioning operation mode.

[0022] The state of the water inlet passage and the water outlet passage is controlled to the target open state.

[0023] Further, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes:

[0024] When the air conditioner is in heating mode, the target opening state of the water inlet passage and the water outlet passage is that the second water inlet passage is open, the first water outlet passage is open, and the second water outlet passage is closed.

[0025] Further, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes:

[0026] When the air conditioner is in cooling mode, the temperature of the photovoltaic thermal panel is obtained;

[0027] The target opening state of the water inlet passage and the water outlet passage is determined based on the relationship between the temperature of the photovoltaic thermal panel and the set temperature.

[0028] Further, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes:

[0029] When the air conditioner is in cooling mode, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is open.

[0030] Further, determining the target opening state of the water inlet passage and the water outlet passage based on the relationship between the temperature of the photovoltaic thermal panel and the set temperature includes:

[0031] When the temperature of the photovoltaic thermal panel is less than or equal to the set temperature, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is open and the second water outlet passage is closed.

[0032] When the temperature of the photovoltaic thermal panel is greater than the set temperature, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the second water outlet passage is open.

[0033] Furthermore, it also includes:

[0034] Obtain photovoltaic power generation;

[0035] Determine the preset range in which the photovoltaic power generation capacity is located, and each preset range corresponds to a control strategy;

[0036] The air conditioning system is controlled based on the aforementioned control strategy.

[0037] Furthermore, the air conditioning system's water pumps include a first water pump and a second water pump, which are connected in parallel. The first water pump is powered by the power grid, and the second water pump is powered by the photovoltaic cells. The step of determining the preset range of photovoltaic power generation, with each preset range corresponding to a water pump control strategy, includes:

[0038] When the sum of the power of the second water pump and the power of the ground source heat pump unit of the air conditioning system is less than or equal to the photovoltaic power generation power, the photovoltaic power generation power is determined to be in the first interval. The control strategy corresponding to the first interval is the first control strategy. The first control strategy includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, while controlling the first water pump to use at a reduced frequency while ensuring the water intake, and the surplus power is fed into the grid.

[0039] And / or, when the sum of the power of the second water pump and the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than or equal to the power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the second interval, and the control strategy corresponding to the second interval is the second control strategy, which includes: the photovoltaic cells only supply power to the ground source heat pump unit, and the surplus power is fed into the grid;

[0040] And / or, when the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the third interval, and the control strategy corresponding to the third interval is the third control strategy, which includes: the photovoltaic cells and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is fed into the grid;

[0041] And / or, when the photovoltaic power generation is greater than or equal to the power of the second water pump, and the photovoltaic power generation is less than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation is determined to be in the fourth interval, and the control strategy corresponding to the fourth interval is the fourth control strategy. The fourth control strategy includes: the photovoltaic cell only supplies power to the second water pump, and at the same time, while ensuring the water intake, the first water pump is controlled to use at a reduced frequency, and the surplus power is fed into the grid.

[0042] And / or, when the photovoltaic power generation is less than the power of the second water pump, the photovoltaic power generation is determined to be in the fifth interval, and the control strategy corresponding to the fifth interval is the fifth control strategy, which includes: direct grid connection.

[0043] Beneficial effects:

[0044] This application provides a photovoltaic-thermal-ground source heat pump air conditioning structure, system, and control method. A water inlet passage is provided between the water pump and the ground source heat pump unit; a water outlet passage is provided between the ground source heat pump unit and the buried pipe heat exchanger. When the first water inlet passage is connected, the water from the pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, the water from the pump exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit; when the first water outlet passage is connected, the water from the ground source heat pump unit directly enters the buried pipe heat exchanger; when the second water outlet passage is connected, the water from the ground source heat pump unit exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit. This application, by controlling the opening and closing of the first water inlet passage, second water inlet passage, first water outlet passage, and second water outlet passage, can combine the characteristics of the photovoltaic system and the ground source heat pump to reduce energy loss and improve system efficiency while ensuring user comfort. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of an existing photovoltaic-thermal-ground source heat pump air conditioning structure provided in an embodiment of this application;

[0047] Figure 2 This is a schematic diagram of a photovoltaic-thermal-ground source heat pump air conditioning structure provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of another photovoltaic-thermal-ground source heat pump air conditioning structure provided in an embodiment of this application;

[0049] Figure 4 This is a flowchart of a photovoltaic-thermal-ground source heat pump air conditioning system control method provided in an embodiment of this application;

[0050] Figure 5 This is a flowchart illustrating a specific control method for a photovoltaic-thermal-ground source heat pump air conditioning system provided in an embodiment of this application.

[0051] Figure 6 This is a flowchart of a power supply control method for a photovoltaic-thermal-ground source heat pump air conditioning system provided in an embodiment of this application.

[0052] Figure label:

[0053] 1-First solenoid valve; 2-Second solenoid valve; 3-Third solenoid valve; 4-Fourth solenoid valve; 5-Fifth solenoid valve; 6-Sixth solenoid valve; 7-Seventh solenoid valve; 8-Eighth solenoid valve; 9-Ninth solenoid valve; 10-Buried pipe heat exchanger; 11-First water pump; 12-Second water pump; 13-Mixed flow valve; 14-Photovoltaic thermal panel; 15-Ground source heat pump unit; 16-DC bus; 17-Rectifier; 18-Power grid; 19-User side. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] like Figure 1 As shown, Figure 1 An existing photovoltaic-thermal-ground source heat pump air conditioning structure is provided, in which the electricity generated by the photovoltaic system is generally stored in photovoltaic cells (the figure shows an energy storage battery, which is the same as the photovoltaic system) or directly connected to the grid. Figure 1 In the structure shown, during cooling mode, the circulating water used for cooling the photovoltaic thermal panels is at a relatively high temperature. If this water were to enter the unit's condenser for cooling, it would significantly reduce the unit's energy efficiency. Therefore, in the system design, the circulating water flowing through the PV / T panels for cooling is not introduced into the ground source heat pump. Instead, the circulating water flowing through the photovoltaic thermal panels is primarily used for domestic hot water.

[0056] To solve this problem, refer to Figure 2 This application provides a photovoltaic thermal-ground source heat pump air conditioning structure, including: a buried pipe heat exchanger 10, a water pump, a ground source heat pump unit 15, and a photovoltaic thermal panel 14;

[0057] The buried pipe heat exchanger 10 is connected to the water pump, and the ground source heat pump unit 15 exchanges heat with the user side 19; a first solenoid valve 1 is provided between the buried pipe heat exchanger 10 and the water pump.

[0058] In this embodiment, the water pump is a first water pump 11, which is powered by the power grid 18.

[0059] A water inlet passage is provided between the water pump and the ground source heat pump unit 15; a water outlet passage is provided between the ground source heat pump unit 15 and the buried pipe heat exchanger 10.

[0060] The water inlet passage includes a first water inlet passage and / or a second water inlet passage; the water outlet passage includes a first water outlet passage and / or a second water outlet passage.

[0061] When the first water inlet passage is open, the water from the pump directly enters the ground source heat pump unit 15; a fourth solenoid valve 4 is provided in the first water inlet passage to control the opening and closing of the first water inlet passage.

[0062] When the second water inlet passage is connected, the water from the pump exchanges heat with the photovoltaic thermal panel 14 and then enters the ground source heat pump unit 15. A fifth solenoid valve 5 and a ninth solenoid valve 9 are provided in the second water inlet passage. The fifth solenoid valve 5 is located between the first water pump 11 and the photovoltaic thermal panel 14, and the ninth solenoid valve 9 is located between the photovoltaic thermal panel 14 and the water inlet of the ground source heat pump unit 15.

[0063] When the first water outlet passage is connected, the water from the ground source heat pump unit 15 directly enters the buried pipe heat exchanger 10; the first water outlet passage is equipped with an eighth solenoid valve 8, which is used to control the opening and closing of the first water inlet passage.

[0064] When the second water outlet passage is connected, the water from the ground source heat pump unit 15 exchanges heat with the photovoltaic thermal panel 14 and then enters the ground source heat pump unit 15. The second water outlet passage is equipped with a sixth solenoid valve 6 and a seventh solenoid valve 7. The sixth solenoid valve 6 is located between the water outlet of the ground source heat pump unit 15 and the photovoltaic thermal panel 14, and the seventh solenoid valve 7 is located between the photovoltaic thermal panel 14 and the buried pipe heat exchanger 10.

[0065] This includes a power grid 18 and a DC bus 16. The power grid 18 can supply power to the DC bus 16 through a rectifier 17, and the DC bus 16 supplies power to the ground source heat pump unit 15. Alternatively, the electricity generated by the photovoltaic thermal panel 14 can supply power to the DC bus 16, and the electricity generated by the photovoltaic thermal panel 14 can also be directly fed into the photovoltaic cells.

[0066] In another embodiment, such as Figure 3 As shown, it is similar to Figure 2 The repeated parts will not be described in detail here. The difference is that the water pump includes a first water pump 11, a second water pump 12, and a mixing valve 13.

[0067] The first water pump 11 and the second water pump 12 are connected in parallel; wherein the first water pump 11 is equipped with a third solenoid valve 3 and the second water pump 12 is equipped with a second solenoid valve 2.

[0068] The first water pump 11 is powered by the power grid 18;

[0069] The second water pump 12 is powered by a photovoltaic cell;

[0070] Water from the first water pump 11 and the second water pump 12 enters the water inlet passage after passing through the mixing valve 13.

[0071] The electricity generated by the photovoltaic thermal panel 14 provided in this embodiment can also power the second water pump 12.

[0072] Based on the same inventive concept, this application provides a photovoltaic-thermal-ground source heat pump air conditioning system, including the photovoltaic-thermal-ground source heat pump air conditioning structure provided in the above embodiments.

[0073] The photovoltaic-thermal-ground source heat pump air conditioning system provided in this application includes a water inlet passage between a water pump and a ground source heat pump unit; and a water outlet passage between the ground source heat pump unit and a buried pipe heat exchanger. When the first water inlet passage is connected, water from the water pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, water from the water pump exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit; when the first water outlet passage is connected, water from the ground source heat pump unit directly enters the buried pipe heat exchanger; and when the second water outlet passage is connected, water from the ground source heat pump unit exchanges heat with the photovoltaic thermal panel before entering the ground source heat pump unit. This application's solution, by controlling the opening and closing of the first water inlet passage, second water inlet passage, first water outlet passage, and second water outlet passage, can combine the characteristics of the photovoltaic system and the ground source heat pump to reduce energy loss and improve system efficiency while ensuring user comfort.

[0074] Based on the same inventive concept, such as Figure 4 As shown, this application also provides a control method for a photovoltaic-thermal-ground source heat pump air conditioning system, including a method applied to the aforementioned air conditioning system, wherein the water inlet passage of the air conditioning system includes a first water inlet passage and a second water inlet passage, and the water outlet passage of the air conditioning system includes a first water outlet passage and a second water outlet passage, the method comprising:

[0075] S11: Determine the air conditioner operating mode, which includes a cooling mode and a heating mode. It should be noted that other operating modes may be included, but this application does not improve or limit the control scheme for other operating modes.

[0076] S12: Determine the target opening status of the water inlet passage and the water outlet passage based on the air conditioning operation mode.

[0077] As a preferred implementation of this application, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes:

[0078] When the air conditioner is in heating mode, the target opening state of the inlet and outlet water passages is that the second inlet water passage is open, the first outlet water passage is open, and the second outlet water passage is closed. In one embodiment, the first inlet water passage is closed, in which case all water passes through the photovoltaic thermal panel before entering the ground source heat pump unit. In another embodiment, the first inlet water passage is open, in which case a portion of the water passes through the photovoltaic thermal panel before entering the ground source heat pump unit, while the remaining water does not pass through the photovoltaic thermal panel unit. The reasons for opening both passages are twofold: firstly, to ensure the temperature of the photovoltaic thermal panel remains within a certain range; and secondly, because in some cases the ground source heat pump unit has certain requirements for the inlet water temperature, i.e., its inlet water temperature cannot be too high, thus requiring the first inlet water passage to be opened simultaneously.

[0079] When the air conditioner is in heating mode, the above-mentioned scheme is used. For cooling, a control scheme can be employed where only the first water inlet passage is open while the second water inlet passage is closed, and the first water outlet passage is open while the second water outlet passage is closed. That is, in some embodiments, the cooling mode still uses a traditional control scheme to prevent water flowing through the photovoltaic thermal panels from entering the ground source heat pump unit. Alternatively, the scheme of the following embodiments can be used in cooling mode.

[0080] In one embodiment, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operating mode includes:

[0081] When the air conditioner is in cooling mode, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is open.

[0082] In another embodiment, determining the target opening state of the water inlet passage and the water outlet passage based on the air conditioning operating mode includes:

[0083] When the air conditioner is in cooling mode, the temperature of the photovoltaic thermal panel is obtained; based on the relationship between the temperature of the photovoltaic thermal panel and the set temperature, the target opening state of the water inlet passage and the water outlet passage is determined.

[0084] For example, when the temperature of the photovoltaic thermal panel is less than or equal to the set temperature, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is open and the second water outlet passage is closed.

[0085] When the temperature of the photovoltaic thermal panel exceeds the set temperature, the target opening state of the water inlet and outlet passages is that the first water inlet passage is open and the second water inlet passage is closed, while the second water outlet passage is open. At this time, the first water outlet passage may or may not be open, depending on actual needs.

[0086] It should be noted that when any of the above solutions are used in the cooling mode in the embodiments of this application, the heating mode can adopt the solution of the above embodiments, or the first water inlet passage can be opened and the second water inlet passage can be closed, the first water outlet passage can be opened and the second water outlet passage can be closed, that is, the water entering the ground source heat pump unit is not preheated.

[0087] S13: Control the state of the water inlet passage and the water outlet passage to the target open state.

[0088] As a preferred implementation of the embodiments of this application, it further includes:

[0089] Obtain the photovoltaic power generation; determine the preset range in which the photovoltaic power generation is located, with each preset range corresponding to a control strategy; control the air conditioning system based on the control strategy.

[0090] by Figure 3 Taking the structure shown as an example, the water pumps of the air conditioning system include a first water pump and a second water pump, which are connected in parallel. The first water pump is powered by the power grid, and the second water pump is powered by photovoltaic cells. The step of determining the preset range of photovoltaic power generation, with each preset range corresponding to a water pump control strategy, includes:

[0091] When the sum of the power of the second water pump and the power of the ground source heat pump unit of the air conditioning system is less than or equal to the photovoltaic power generation power, the photovoltaic power generation power is determined to be in the first interval. The control strategy corresponding to the first interval is the first control strategy. The first control strategy includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, while controlling the first water pump to use at a reduced frequency while ensuring the water intake, and the surplus power is fed into the grid.

[0092] And / or, when the sum of the power of the second water pump and the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than or equal to the power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the second interval, and the control strategy corresponding to the second interval is the second control strategy, which includes: the photovoltaic cells only supply power to the ground source heat pump unit, and the surplus power is fed into the grid;

[0093] And / or, when the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the third interval, and the control strategy corresponding to the third interval is the third control strategy, which includes: the photovoltaic cells and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is fed into the grid;

[0094] And / or, when the photovoltaic power generation is greater than or equal to the power of the second water pump, and the photovoltaic power generation is less than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation is determined to be in the fourth interval, and the control strategy corresponding to the fourth interval is the fourth control strategy. The fourth control strategy includes: the photovoltaic cell only supplies power to the second water pump, and at the same time, while ensuring the water intake, the first water pump is controlled to use at a reduced frequency, and the surplus power is fed into the grid.

[0095] And / or, when the photovoltaic power generation is less than the power of the second water pump, the photovoltaic power generation is determined to be in the fifth interval, and the control strategy corresponding to the fifth interval is the fifth control strategy, which includes: direct grid connection.

[0096] To more clearly illustrate the solution proposed in this application, a specific implementation method is provided below, with the control logic as follows: Figure 5 As shown:

[0097] In cooling mode: Solenoid valves 1, 3, and 4 are open, while solenoid valves 5 and 9 are closed. When the photovoltaic (PV) thermal panel temperature T1 ≤ the set value T0, the PV thermal panel temperature sensor feeds this status back to the control system. At this time, solenoid valve 8 opens, and solenoid valves 6 and 7 close. Water from the buried pipe heat exchanger flows through the first and second water pumps (solenoid valve 2 opens when the PV drives the second water pump, otherwise it closes) to the condenser of the ground source heat pump unit. The condenser water then returns directly to the buried pipe heat exchanger for heat exchange. When the PV thermal panel temperature T > the set value T0: The temperature sensor on the PV panel detects the excessively high temperature and sends a signal to the control system. At this time, solenoid valves 6 and 7 open, and solenoid valve 8 closes. The condenser return water flows through the PV thermal panel to cool it down. After cooling the PV / T panel, the condenser return water flows back to the buried pipe heat exchanger. Using condenser return water to cool the PV / T panel ensures unit efficiency and improves the power generation efficiency of the PV modules.

[0098] In heating mode: Solenoid valves 1, 3, 5, 8, and 9 are open, and solenoid valves 4, 6, and 7 are closed. The circulating water from the buried pipe merges with the first and second water pumps and enters the photovoltaic thermal panel to preheat the circulating water and increase the inlet temperature of the ground source heat pump unit. Then it enters the ground source heat pump unit and returns to the buried pipe heat exchanger via solenoid valve 8.

[0099] PV / T power supply mode: PV / T power supply logic is as follows Figure 6 As shown below:

[0100] By reading the power generation power PV of the PV / T panel in real time.

[0101] Judge the relationship between the photovoltaic power generation power and the power required by the ground source heat pump unit.

[0102] When the photovoltaic power generation power is higher than the sum of the power required by the unit P1 and the power of the second water pump P3 (i.e., P1 + P3 ≤ PV), the photovoltaic cells supply power to both the unit and the second water pump on the ground source side at the same time, achieving immediate use of the generated electricity and feeding the surplus electricity into the grid. When the second water pump starts, the first water pump operates at a reduced frequency, and the two jointly ensure the ground source circulating water flow.

[0103] When the photovoltaic power generation power is higher than the power required by the unit P1 and less than the sum of the power required by the unit P1 and the power of the second water pump P3 (P1 ≤ PV < P1 + P3), the photovoltaic cells only supply power to the unit, and the surplus electricity is fed into the grid.

[0104] When the photovoltaic power generation power can only meet the minimum starting power P2 of the unit and is lower than the power required by the unit P1 (i.e., P2 ≤ PV < P1), the photovoltaic cells and the power grid jointly supply power to the unit, and the remaining power is supplemented by the power grid.

[0105] When the photovoltaic power generation power does not meet the minimum starting power of the unit and is higher than the power of the second water pump (i.e., P3 ≤ PV < P2), the photovoltaic cells only supply power to the second water pump, and the surplus electricity is fed into the grid. At this time, the first water pump can operate at a reduced frequency while ensuring the rated flow on the ground source side to reduce energy consumption.

[0106] When the photovoltaic power generation power is less than the power of the second water pump (i.e., PV < P3), it is directly connected to the grid.

[0107] The specific control scheme provided in this application connects a photovoltaic / telephoto panel (PV / T panel) to the ground source side of the generating unit. This system detects the temperature of the PV panel using a temperature sensor and automatically adjusts the opening and closing of the solenoid valve based on temperature changes, thereby controlling the flow of circulating water on the ground source side to achieve precise temperature control of the PV / t panel. This invention realizes the cascade utilization of photovoltaic power generation and improves the power generation efficiency of the PV / T panel. By introducing a coupling system between the PV / T panel and the ground source side circulating water, in cooling mode, when the PV / T panel overheats, the condenser return water is used to cool the PV / T panel, maintaining its surface temperature within a reasonable range. This improves photovoltaic power generation efficiency while meeting the unit's cooling requirements. In heating mode, the PV / T panel is used to preheat the ground source side circulating water, further improving the system's energy efficiency ratio. This invention, by real-time monitoring of photovoltaic power generation and intelligent adjustment of the photovoltaic cells' power supply target (generator unit or water pump), achieves on-demand photovoltaic power generation, reducing energy waste, decreasing dependence on the external power grid, and optimizing energy utilization efficiency. PV / T coupled ground source heat pump systems can achieve high energy efficiency ratios and significantly reduce the energy consumption of the entire system.

[0108] Based on the same inventive concept, this application also provides a control system for a photovoltaic thermal-ground source heat pump air conditioning system, comprising:

[0109] At least one processor and at least one memory;

[0110] The memory stores the executable instructions of the processor;

[0111] The processor is configured to execute the photovoltaic-thermal-ground source heat pump air conditioning system control method provided in the above embodiments.

[0112] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0113] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

Claims

1. A control method for a photovoltaic-thermal-ground source heat pump air conditioning system, characterized in that, The air conditioning system includes: a buried pipe heat exchanger, a water pump, a ground source heat pump unit, and a photovoltaic thermal panel; the buried pipe heat exchanger is connected to the water pump, and the ground source heat pump unit exchanges heat with the user side; a water inlet passage is provided between the water pump and the ground source heat pump unit; a water outlet passage is provided between the ground source heat pump unit and the buried pipe heat exchanger; the water inlet passage includes a first water inlet passage and a second water inlet passage; the water outlet passage includes a first water outlet passage and a second water outlet passage; when the first water inlet passage is connected, the water from the water pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, the water from the water pump exchanges heat with the photovoltaic thermal panel and then enters the ground source heat pump unit; when the first water outlet passage is connected, the water from the ground source heat pump unit directly enters the buried pipe heat exchanger; when the second water outlet passage is connected, the water from the ground source heat pump unit exchanges heat with the photovoltaic thermal panel and then enters the buried pipe heat exchanger, and the method includes: Determine the air conditioner's operating mode, which includes a cooling mode and a heating mode; The target opening status of the water inlet passage and the water outlet passage is determined based on the air conditioning operation mode. The state of the water inlet passage and the water outlet passage is controlled to the target open state; Determining the target opening status of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes: When the air conditioner is in heating mode, the target opening state of the water inlet passage and the water outlet passage is that the second water inlet passage is open, the first water outlet passage is open, and the second water outlet passage is closed. Also includes: Obtain photovoltaic power generation; Determine the preset range in which the photovoltaic power generation capacity is located, and each preset range corresponds to a control strategy; The air conditioning system is controlled based on the aforementioned control strategy.

2. The method according to claim 1, characterized in that: Determining the target opening status of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes: When the air conditioner is in cooling mode, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is open.

3. The method according to claim 1, characterized in that: Determining the target opening status of the water inlet passage and the water outlet passage based on the air conditioning operation mode includes: When the air conditioner is in cooling mode, the temperature of the photovoltaic thermal panel is obtained; The target opening state of the water inlet passage and the water outlet passage is determined based on the relationship between the temperature of the photovoltaic thermal panel and the set temperature.

4. The method according to claim 3, characterized in that: The determination of the target opening state of the water inlet passage and the water outlet passage based on the relationship between the temperature of the photovoltaic thermal panel and the set temperature includes: When the temperature of the photovoltaic thermal panel is less than or equal to the set temperature, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the first water outlet passage is open and the second water outlet passage is closed. When the temperature of the photovoltaic thermal panel is greater than the set temperature, the target opening state of the water inlet passage and the water outlet passage is that the first water inlet passage is open and the second water inlet passage is closed, and the second water outlet passage is open.

5. The method according to claim 1, characterized in that, The air conditioning system's water pumps include a first water pump and a second water pump, which are connected in parallel. The first water pump is powered by the power grid, and the second water pump is powered by the photovoltaic cells. The process of determining the preset range of photovoltaic power generation, with each preset range corresponding to a control strategy, includes: When the sum of the power of the second water pump and the power of the ground source heat pump unit of the air conditioning system is less than or equal to the photovoltaic power generation power, the photovoltaic power generation power is determined to be in the first interval. The control strategy corresponding to the first interval is the first control strategy. The first control strategy includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, while controlling the first water pump to use at a reduced frequency while ensuring the water intake, and the surplus power is fed into the grid. And / or, when the sum of the power of the second water pump and the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than or equal to the power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the second interval, and the control strategy corresponding to the second interval is the second control strategy, which includes: the photovoltaic cells only supply power to the ground source heat pump unit, and the surplus power is fed into the grid; And / or, when the power of the ground source heat pump unit is greater than the photovoltaic power generation power, and the photovoltaic power generation power is greater than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation power is determined to be in the third interval, and the control strategy corresponding to the third interval is the third control strategy, which includes: the photovoltaic cells and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is fed into the grid; And / or, when the photovoltaic power generation is greater than or equal to the power of the second water pump, and the photovoltaic power generation is less than the minimum starting power of the ground source heat pump unit, the photovoltaic power generation is determined to be in the fourth interval, and the control strategy corresponding to the fourth interval is the fourth control strategy. The fourth control strategy includes: the photovoltaic cell only supplies power to the second water pump, and at the same time, while ensuring the water intake, the first water pump is controlled to use at a reduced frequency, and the surplus power is fed into the grid. And / or, when the photovoltaic power generation is less than the power of the second water pump, the photovoltaic power generation is determined to be in the fifth interval, and the control strategy corresponding to the fifth interval is the fifth control strategy, which includes: direct grid connection.

Images