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

Abstract

The invention discloses a photovoltaic photo-thermal-ground source heat pump air conditioner structure and system and a control method of the photovoltaic photo-thermal-ground source heat pump air conditioner structure and system, and belongs to the field of air conditioners. A water inlet passage is arranged between the water pump and the ground source heat pump unit; a water outlet passage is arranged between the ground source heat pump unit and the ground heat exchanger; when the first water inlet passage is communicated, water of the water pump directly enters the ground source heat pump unit; when the second water inlet channel is communicated, water of the water pump exchanges heat with the photovoltaic photo-thermal plate and then enters the ground source heat pump unit; when the first water outlet passage is communicated, water of the ground source heat pump unit directly enters the ground heat exchanger; and when the second water outlet passage is communicated, water of the ground source heat pump unit exchanges heat with the photovoltaic photo-thermal plate and then enters the ground source heat pump unit. According to the scheme, by controlling opening and closing of the first water inlet channel, the second water inlet channel, the first water outlet channel and the second water outlet channel, the characteristics of the photovoltaic system and the ground source heat pump can be combined, and under the condition that the comfort degree of a user is guaranteed, energy loss is reduced, and the efficiency of the system is improved.

Description

Technical Field

[0001] The present application relates to, in particular, the field of air conditioning technology, and to a photovoltaic solar thermal-ground source heat pump air conditioning structure, system and control method thereof. Background Art

[0002] Under the dual pressures of surging global energy demand and climate change, the development and application of clean energy technologies have become a global consensus. Photovoltaic (PV) systems and ground-source heat pumps (GSHP), as two energy-efficient and environmentally friendly ways of utilizing energy, have shown great potential in power supply and thermal energy management, respectively. However, when operating independently, the photovoltaic system will suffer from the problem of reduced power generation efficiency due to temperature rise, which limits the efficiency and reliability of energy utilization. The electricity generated by the photovoltaic system must match the demand, otherwise energy will be wasted. The ground-source heat pump system is efficient and stable, and consumes less energy than traditional air-conditioning systems. Its coupling with photovoltaic thermal panels (PV / T panels) further enhances the environmental friendliness of the system. However, in the cooling mode of the traditional photovoltaic thermal-ground-source heat pump air-conditioning system, the circulating water used for cooling the PV / T panels cannot enter the unit condenser for cooling, and can only be used for domestic hot water or heat storage, which to a certain extent causes energy waste in the ground-source side circulating pump. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present application provides a photovoltaic thermal-ground source heat pump air-conditioning structure, system and control method thereof, so as 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 refrigeration and can only be used for domestic hot water or heat storage, which to a certain extent causes energy waste of the ground source side circulation 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, comprising: 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 in the water 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 of the ground source heat pump unit directly enters the buried pipe heat exchanger;

[0012] When the second water outlet passage is connected, the water of the ground source heat pump unit enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel.

[0013] Further, 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 a photovoltaic cell;

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

[0018] In a second aspect, a photovoltaic solar thermal-ground source heat pump air conditioning system is provided, comprising: the above-mentioned photovoltaic solar thermal-ground source heat pump air conditioning structure.

[0019] In a third aspect, a photovoltaic-thermal-ground source heat pump air conditioning system control method is provided, including, applied to the above-mentioned 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, and the method includes:

[0020] Determining an air conditioner operating mode, wherein the operating mode includes a cooling mode and a heating mode;

[0021] determining a target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode;

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

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

[0024] When the air conditioner operation mode is the heating mode, the target opening states of the water inlet passage and the water outlet passage are that the second water inlet passage is opened, the first water outlet passage is opened, and the second water outlet passage is closed.

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

[0026] When the air conditioner operation mode is a cooling mode, obtaining the temperature of the photovoltaic thermal panel;

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

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

[0029] When the air conditioner operation mode is the cooling mode, the target opening states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is opened.

[0030] Furthermore, the determining of the target opening states of the water inlet passage and the water outlet passage based on the magnitude 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 states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is opened 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 states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the second water outlet passage is opened.

[0033] Furthermore, it also includes:

[0034] Obtain photovoltaic power generation power;

[0035] Determine a preset interval in which the photovoltaic power generation power is located, each preset interval corresponding to a control strategy;

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

[0037] Furthermore, the water pump of the air conditioning system includes a first water pump and a second water pump, the first water pump and the second water pump are connected in parallel, the first water pump is powered by a power grid, and the second water pump is powered by a photovoltaic cell; the determining of the preset interval in which the photovoltaic power generation power is located, each preset interval 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, it is determined that the photovoltaic power generation power is in the first interval, and the control strategy corresponding to the first interval is the first control strategy, which includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, and at the same time, the frequency of the first water pump is controlled to be reduced on the basis of ensuring the water intake, and the surplus power is connected to 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, it is determined that the photovoltaic power generation power is in the second interval, and the control strategy corresponding to the second interval is the second control strategy, and the second control strategy includes: the photovoltaic cell only supplies power to the ground source heat pump unit, and the remaining power is connected to 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, it is determined that the photovoltaic power generation power is in a third interval, and the control strategy corresponding to the third interval is a third control strategy, and the third control strategy includes: the photovoltaic cell and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is connected to the grid;

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

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

[0043] Beneficial effects:

[0044] The technical solution of the present application provides a photovoltaic-ground source heat pump air conditioning structure, system and control method thereof. 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 underground pipe heat exchanger; when the first water inlet passage is connected, the water of the water pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, the water of the water pump enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel; when the first water outlet passage is connected, the water of the ground source heat pump unit directly enters the underground pipe heat exchanger; when the second water outlet passage is connected, the water of the ground source heat pump unit enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel. The present application solution can combine the characteristics of the photovoltaic system and the ground source heat pump by controlling the opening and closing of the first water inlet passage, the second water inlet passage, the first water outlet passage and the second water outlet passage, and reduce energy loss and improve the efficiency of the system while ensuring user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0048] Figure 3 This is another schematic diagram of the photovoltaic-ground source heat pump air conditioner structure provided in an embodiment of the present application;

[0049] Figure 4 This is a flow chart of a photovoltaic solar thermal-ground source heat pump air conditioning system control method provided in an embodiment of the present application;

[0050] Figure 5 This is a flow chart of a specific photovoltaic solar thermal-ground source heat pump air conditioning system control method provided in an embodiment of the present application;

[0051] Figure 6 It is a flow chart of a power supply control method for a photovoltaic solar thermal-ground source heat pump air conditioning system provided in an embodiment of the present application.

[0052] Reference numerals:

[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-underground pipe heat exchanger; 11-first water pump; 12-second water pump; 13-mixing valve; 14-photovoltaic thermal panel; 15-ground source heat pump unit; 16-DC bus; 17-rectifier; 18-grid; 19-user side. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0055] like Figure 1 As shown, Figure 1 An existing photovoltaic solar 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 (energy storage batteries in the figure, the two are the same) or directly connected to the grid. Figure 1 In the structure shown, in cooling mode, the circulating water temperature used for cooling the photovoltaic thermal panels is relatively high, and entering the unit condenser for cooling will significantly reduce the unit's energy efficiency. Therefore, when designing the system, the circulating water that flows through the PV / T panels for cooling will not be introduced into the ground source heat pump, but the circulating water after flowing through the photovoltaic thermal panels will be used for domestic hot water.

[0056] To solve this problem, refer to Figure 2 , the embodiment of the present 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 underground 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 underground heat exchanger 10 and the water pump.

[0058] Among them, the water pump in the embodiment of the present application is a first water pump 11, and the first water pump 11 is powered by a 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 connected, the water of the water pump directly enters the ground source heat pump unit 15; a fourth solenoid valve 4 is provided in the first water inlet passage for controlling the opening and closing of the first water inlet passage.

[0062] When the second water inlet passage is connected, the water in the water pump enters the ground source heat pump unit 15 after heat exchange with the photovoltaic thermal panel 14; the fifth solenoid valve 5 and the ninth solenoid valve 9 are arranged in the second water inlet passage, the fifth solenoid valve 5 is arranged between the first water pump 11 and the photovoltaic thermal panel 14, and the ninth solenoid valve 9 is arranged 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 of the ground source heat pump unit 15 directly enters the buried pipe heat exchanger 10; the first water outlet passage is provided with an eighth solenoid valve 8 for controlling the opening and closing of the first water inlet passage.

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

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

[0066] In another embodiment, if Figure 3 As shown, it is Figure 2 The repeated parts will not be described in detail here, and 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; the first water pump 11 is correspondingly provided with a third solenoid valve 3 , and the second water pump 12 is correspondingly provided with a second solenoid valve 2 .

[0068] The first water pump 11 supplies power to the power grid 18;

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

[0070] The 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 the embodiment of the present application can also power the second water pump 12 .

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

[0073] The photovoltaic-thermal-ground source heat pump air conditioning system provided by the embodiment of the present application includes a photovoltaic-thermal-ground source heat pump air conditioning structure in which 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 underground pipe heat exchanger; when the first water inlet passage is connected, the water of the water pump directly enters the ground source heat pump unit; when the second water inlet passage is connected, the water of the water pump enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel; when the first water outlet passage is connected, the water of the ground source heat pump unit directly enters the underground pipe heat exchanger; when the second water outlet passage is connected, the water of the ground source heat pump unit enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel. The present application scheme can combine the characteristics of the photovoltaic system and the ground source heat pump by controlling the opening and closing of the first water inlet passage, the second water inlet passage, the first water outlet passage, and the second water outlet passage, and reduce energy loss and improve the efficiency of the system while ensuring user comfort.

[0074] Based on the same inventive concept, Figure 4 As shown, the present application also provides a photovoltaic solar thermal-ground source heat pump air conditioning system control method, including, applied to the above-mentioned 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, and the method includes:

[0075] S11: Determine the air conditioner operation mode, which includes a cooling mode and a heating mode. It should be noted that it may include other operation modes, but the present application does not improve or limit the control schemes of other operation modes.

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

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

[0078] When the air-conditioning operation mode is the heating mode, the target opening states of the water inlet passage and the water outlet passage are that the second water inlet passage is opened, the first water outlet passage is opened and the second water outlet passage is closed. In one embodiment, the first water inlet passage is closed, and at this time all the water passes through the photovoltaic thermal panel and then enters the ground source heat pump unit. In another embodiment, the first water inlet passage is opened, and at this time part of the water passes through the photovoltaic thermal panel and enters the ground source heat pump unit, and the other part of the water does not pass through the photovoltaic thermal panel unit. One reason for opening at the same time is to ensure that the temperature of the photovoltaic thermal panel is within a certain range, and the other is that in some cases, the ground source heat pump unit has certain requirements for the inlet water temperature, that is, its inlet water temperature cannot be too high, so it is necessary to open the first water inlet passage at the same time.

[0079] While the above scheme is adopted when the air conditioner operation mode is the heating mode, the cooling can only adopt the control scheme of opening the first water inlet passage and closing the second water inlet passage, opening the first water outlet passage and closing the second water outlet passage. That is, in some embodiments, the cooling mode still adopts the traditional control scheme, and the water flowing through the photovoltaic thermal panel is not allowed to enter the ground source heat pump unit. Or the scheme of the following embodiment is adopted in the cooling mode.

[0080] In one embodiment, the determining the target opening states of the water inlet passage and the water outlet passage based on the air conditioner operation mode includes:

[0081] When the air conditioner operation mode is the cooling mode, the target opening states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is opened.

[0082] In another embodiment, determining the target opening states of the water inlet passage and the water outlet passage based on the air conditioner operation mode includes:

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

[0084] Exemplarily, when the temperature of the photovoltaic thermal panel is less than or equal to the set temperature, the target opening states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is opened and the second water outlet passage is closed.

[0085] When the temperature of the photovoltaic thermal panel is greater than the set temperature, the target opening states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the second water outlet passage is opened. At this time, the first water outlet passage can be opened or not, which is set according to actual needs.

[0086] It should be noted that when any of the above solutions is adopted in the cooling mode in the embodiment of the present application, the heating mode can adopt the solution of the above embodiment, or the first water inlet passage can be opened and the second water inlet passage can be closed, and 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: Controlling the states of the water inlet passage and the water outlet passage to be the target open state.

[0088] As a preferred implementation method of the embodiment of the present application, it also includes:

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

[0090] by Figure 3 Taking the structure shown as an example, the water pump of the air conditioning system includes a first water pump and a second water pump, the first water pump and the second water pump are connected in parallel, the first water pump is powered by the power grid, and the second water pump is powered by a photovoltaic cell; the preset interval in which the photovoltaic power generation power is located is determined, and each preset interval corresponds to a water pump control strategy, including:

[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, it is determined that the photovoltaic power generation power is in the first interval, and the control strategy corresponding to the first interval is the first control strategy, which includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, and at the same time, the frequency of the first water pump is controlled to be reduced on the basis of ensuring the water intake, and the surplus power is connected to 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, it is determined that the photovoltaic power generation power is in the second interval, and the control strategy corresponding to the second interval is the second control strategy, and the second control strategy includes: the photovoltaic cell only supplies power to the ground source heat pump unit, and the remaining power is connected to 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, it is determined that the photovoltaic power generation power is in a third interval, and the control strategy corresponding to the third interval is a third control strategy, and the third control strategy includes: the photovoltaic cell and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is connected to the grid;

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

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

[0096] In order to more clearly illustrate the present application scheme, a specific implementation method is provided below. The control logic is as follows: Figure 5 As shown:

[0097] In cooling mode: solenoid valves 1, 3, and 4 are in the open state, and solenoid valves 5 and 9 are in the closed state. When the temperature of the photovoltaic thermal panel T1 ≤ the set value T0, the temperature sensor of the photovoltaic thermal panel feeds back this state to the control system. At this time, solenoid valve 8 is opened, solenoid valves 6 and 7 are closed, and the water discharged from the ground pipe heat exchanger reaches the condenser of the ground source heat pump unit through the first water pump and the second water pump (solenoid valve 2 is opened when the photovoltaic drives the second water pump, otherwise it is closed). The condenser outlet water directly returns to the ground pipe heat exchanger for heat exchange. When the temperature of the photovoltaic thermal panel T>the set value T0: the temperature sensor on the photovoltaic panel detects an excessively high temperature and sends a signal to the control system. At this time, solenoid valves 6 and 7 are opened, and solenoid valve 8 is closed. The condenser return water flows through the photovoltaic thermal panel to cool it. The condenser return water cools the PV / T panel and then flows back to the ground pipe heat exchanger. The condenser return water is used to cool the PV / T panel, which ensures the unit efficiency and improves the power generation efficiency of the photovoltaic module.

[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 in the underground pipes passes through the first water pump and the second water pump and then merges into the photovoltaic thermal panel to preheat the circulating water. When the inlet temperature of the ground source heat pump unit is increased, the circulating water then enters the ground source heat pump unit and then returns to the buried pipe heat exchanger through solenoid valve 8.

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

[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 battery supplies 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 battery only supplies 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 battery 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 battery only supplies 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 the embodiment of the present application connects the photovoltaic thermal panel (PV / T panel) to the ground source side of the unit. The system detects the temperature of the photovoltaic panel through a temperature sensor, and automatically adjusts the opening and closing state of the solenoid valve according to the temperature change, thereby controlling the flow direction of the circulating water on the ground source side to achieve precise control of the temperature of the photovoltaic thermal panel. The present invention realizes the cascade utilization of photovoltaic power generation and improves the power generation efficiency of the PV / T panel. By introducing the coupling system of the PV / T panel and the circulating water on the ground source side, in the cooling mode, when the PV / T panel is overheated, the condenser return water is used to cool the PV / T panel to maintain its surface temperature within a reasonable range, which can improve the photovoltaic power generation efficiency under the condition of meeting the refrigeration requirements of the unit. In the heating mode, the PV / T panel is used to preheat the circulating water on the ground source side, further improving the energy efficiency of the system. The present invention realizes the instant use of photovoltaic power generation by real-time monitoring of photovoltaic power generation and intelligently adjusting the power supply object (unit or water pump) of the photovoltaic cell, reducing energy waste, reducing dependence on the external power grid, and optimizing energy utilization efficiency. The PV / T coupled ground source heat pump system can achieve a high energy efficiency ratio and significantly reduce the energy consumption of the entire system.

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

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

[0110] The memory stores 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 embodiment.

[0112] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

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

Claims

1. A photovoltaic-thermal-ground source heat pump air conditioning structure, characterized in that: include: Ground pipe heat exchangers, water pumps, ground source heat pump units and photovoltaic thermal panels; 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 / or a second water inlet passage; the water outlet passage includes a first water outlet passage and / or 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 in 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 of the ground source heat pump unit directly enters the buried pipe heat exchanger; When the second water outlet passage is connected, the water of the ground source heat pump unit enters the ground source heat pump unit after heat exchange with the photovoltaic thermal panel.

2. The structure according to claim 1, characterized in that: The water pump comprises a first water pump, a second water pump and a mixing valve; The first water pump and the second water pump are connected in parallel; The first water pump is powered by the power grid; The second water pump is powered by a photovoltaic cell; The water from the first water pump and the second water pump enters the water inlet passage after passing through the mixing valve.

3. A photovoltaic-ground source heat pump air conditioning system, characterized in that: include: The structure according to any one of claims 1 to 2.

4. A photovoltaic thermal-ground source heat pump air conditioning system control method, characterized in that: Including, applied to the air conditioning system of claim 3, 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, and the method includes: Determining an air conditioner operating mode, wherein the operating mode includes a cooling mode and a heating mode; determining a target opening state of the water inlet passage and the water outlet passage based on the air conditioning operation mode; The states of the water inlet passage and the water outlet passage are controlled to be the target open state.

5. The method according to claim 4, characterized in that: The determining the target opening states of the water inlet passage and the water outlet passage based on the air conditioner operation mode includes: When the air conditioner operation mode is the heating mode, the target opening states of the water inlet passage and the water outlet passage are that the second water inlet passage is opened, the first water outlet passage is opened, and the second water outlet passage is closed.

6. The method according to claim 4, characterized in that: The determining the target opening states of the water inlet passage and the water outlet passage based on the air conditioner operation mode includes: When the air conditioner operation mode is the cooling mode, the target opening states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is closed and the second water outlet passage is opened.

7. The method according to claim 4, characterized in that: The determining the target opening states of the water inlet passage and the water outlet passage based on the air conditioner operation mode includes: When the air conditioner operation mode is a cooling mode, obtaining the temperature of the photovoltaic thermal panel; The target opening states of the water inlet passage and the water outlet passage are determined based on the magnitude relationship between the temperature of the photovoltaic thermal panel and the set temperature.

8. The method according to claim 7, characterized in that: The determining of the target opening states of the water inlet passage and the water outlet passage based on the magnitude 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 states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the first water outlet passage is opened 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 states of the water inlet passage and the water outlet passage are that the first water inlet passage is opened and the second water inlet passage is closed, and the second water outlet passage is opened.

9. The method according to claim 4, characterized in that Also includes: Obtain photovoltaic power generation power; Determine a preset interval in which the photovoltaic power generation power is located, each preset interval corresponding to a control strategy; The air conditioning system is controlled based on the control strategy.

10. The method according to claim 9, characterized in that The water pump of the air conditioning system includes a first water pump and a second water pump, the first water pump and the second water pump are connected in parallel, the first water pump is powered by a power grid, and the second water pump is powered by a photovoltaic cell; the determining of a preset interval in which the photovoltaic power generation power is located, each preset interval corresponding to a water pump 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, it is determined that the photovoltaic power generation power is in the first interval, and the control strategy corresponding to the first interval is the first control strategy, which includes: the photovoltaic cell simultaneously supplies power to the ground source heat pump unit and the second water pump, and at the same time, the frequency of the first water pump is controlled to be reduced on the basis of ensuring the water intake, and the surplus power is connected to 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, it is determined that the photovoltaic power generation power is in the second interval, and the control strategy corresponding to the second interval is the second control strategy, and the second control strategy includes: the photovoltaic cell only supplies power to the ground source heat pump unit, and the remaining power is connected to 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, it is determined that the photovoltaic power generation power is in a third interval, and the control strategy corresponding to the third interval is a third control strategy, and the third control strategy includes: the photovoltaic cell and the power grid jointly supply power to the ground source heat pump unit, and the surplus power is connected to the grid; And / or, when the photovoltaic power generation power is greater than or equal to the power of the second water pump, and the photovoltaic power generation power is less than the minimum starting power of the ground source heat pump unit, it is determined that the photovoltaic power generation power is in a fourth interval, and the control strategy corresponding to the fourth interval is a fourth control strategy, and the fourth control strategy includes: the photovoltaic cell only supplies power to the second water pump, and at the same time, the frequency of the first water pump is controlled to be reduced on the basis of ensuring the water intake, and the surplus power is connected to the grid; And / or, when the photovoltaic power generation power is less than the power of the second water pump, it is determined that the photovoltaic power generation power is in a fifth interval, the control strategy corresponding to the fifth interval is a fifth control strategy, and the fifth control strategy includes: direct grid connection.

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