A pv / t coupled water source heat pump multi-energy complementary triple supply system and control method

Abstract

The application discloses a PV / T coupled water source heat pump multi-energy complementary triple supply system and a control method, and belongs to the technical fields of solar photovoltaic and photothermal technologies and heat pump technologies. The system comprises a PV / T assembly, a plate heat exchanger, a heating water tank, a water source heat pump unit, a heat storage water tank and an energy supply terminal, the plate heat exchanger is communicated with the PV / T assembly through a pipeline, the heating water tank is communicated with the plate heat exchanger through a pipeline, the water source heat pump unit is communicated with the heating water tank through a pipeline, the heat storage water tank is communicated with the heating water tank through a pipeline, the heat storage water tank is communicated with the water source heat pump unit through a pipeline, and the energy supply terminal is communicated with the heat storage water tank through a pipeline; wherein, a domestic hot water heat exchanger is further connected to the heating water tank, and a domestic hot water supply and return water interface is arranged on the domestic hot water heat exchanger. The application can solve the problems of insufficient heat stratified utilization, low solar energy utilization rate and insufficient heat pump operation stability of the existing PV / T coupled heat pump system.

Description

Technical Field

[0001] This invention relates to the fields of solar photovoltaic and photothermal technologies and heat pump technologies, and particularly to a PV / T coupled water source heat pump multi-energy complementary tri-generation system and its control method. Background Technology

[0002] With the development of low-carbon buildings and the utilization of renewable energy, PV / T (photovoltaic / thermal) modules, water source heat pumps, and thermal storage technologies are gradually becoming important components of integrated building energy supply systems. PV / T modules can simultaneously output electrical and thermal energy, heat pump systems can efficiently improve the quality of low-grade heat energy, and thermal storage devices can balance the time difference between fluctuations in solar energy supply and building load demands. Therefore, coupling these technologies to construct an integrated energy system has high engineering application value.

[0003] However, most existing PV / T coupled heat pump systems only use the heat storage unit as a general hot water buffer container, without specifically designing for maintaining the temperature of the heat source on the evaporator side of the heat pump. Although some systems are equipped with electric heating devices, their function is mostly for direct supplementary heating or as a backup for terminal heating, failing to highlight the function of maintaining a stable heat source side of the heat pump. At the same time, the functional division between the heat source side and the terminal supply side in existing systems is not clear enough, which can easily lead to problems such as chaotic heat organization paths, insufficient heat stratification and utilization, and large fluctuations in heat pump operating conditions.

[0004] For buildings with low nighttime loads and high daytime loads, such as school canteens, office buildings, and teaching buildings, existing systems still have shortcomings such as low solar energy utilization, temperature drop on the heat source side due to continuous cloudy and rainy weather, and insufficient stability of heat pump operation. Summary of the Invention

[0005] The main objective of this invention is to provide a PV / T coupled water source heat pump multi-energy complementary tri-generation system and control method, aiming to solve the problems of insufficient heat stratification utilization, low solar energy utilization rate, and insufficient heat pump operation stability in existing PV / T coupled heat pump systems.

[0006] In a first aspect, to achieve the above objectives, the present invention provides a PV / T coupled water source heat pump multi-energy complementary tri-generation system, comprising: A PV / T module, wherein an inverter and a battery are electrically connected to the PV / T module for converting, storing and distributing the electrical energy generated by the PV / T module; A plate heat exchanger is connected to the PV / T module via a pipe, and a circulating water pump is installed on the pipe between the plate heat exchanger and the PV / T module; A heating water tank is connected to the plate heat exchanger via a pipe, and a second circulating water pump is installed on the pipe between the heating water tank and the plate heat exchanger. A water source heat pump unit is connected to the heating water tank via a pipeline, and a No. 5 circulating water pump is installed on the pipeline between the water source heat pump unit and the heating water tank. A hot water storage tank is connected to the heating water tank via a pipe. A No. 3 circulating water pump is installed on the pipe between the hot water storage tank and the heating water tank. The hot water storage tank is connected to the water source heat pump unit via a pipe. A No. 6 circulating water pump is installed on the pipe between the hot water storage tank and the water source heat pump unit. The power supply terminal is connected to the hot water storage tank via a pipeline, and a No. 4 circulating water pump is installed on the pipeline between the power supply terminal and the hot water storage tank. The heating water tank is also connected to a domestic hot water heat exchanger, which is equipped with domestic hot water supply and return interfaces.

[0007] Optionally, the heating water tank includes: The housing has an exhaust port at the top and a drain port at the bottom. A top-side interface is provided on the top side of the housing, which is connected to the plate heat exchanger via a pipe. A bottom-side interface is provided on the bottom side of the housing, which is connected to the water source heat pump unit via a pipe. The chamber is equipped with a layered flow guiding component and a heat source side temperature maintenance component.

[0008] Optionally, the heat source side temperature maintenance component includes an electric heating rod and the temperature detection component. The electric heating rod is disposed at the bottom of the box, and the temperature detection component is disposed in multiple locations distributed in different positions of the box.

[0009] Optionally, the layered flow guiding assembly includes an upper water distribution plate, a first flow guiding baffle, a second flow guiding baffle, and a lower water collection plate, which are sequentially arranged inside the box.

[0010] Optionally, the water source heat pump unit includes: The evaporator is connected to the heating water tank via a pipe, and the No. 5 circulating water pump is installed on the pipe between the evaporator and the heating water tank; The condenser is connected to the hot water storage tank via a pipe, and the No. 6 circulating water pump is installed on the pipe between the condenser and the hot water storage tank.

[0011] Optionally, the temperature detection component is a temperature sensor, and three sensors are provided, which are respectively arranged in the upper, middle and lower parts of the box to detect the temperature status of different height areas of the box.

[0012] Optionally, the energy supply terminal is at least one of a building heating terminal, a building cooling terminal, or a combined cooling and heating terminal.

[0013] Secondly, embodiments of the present invention also provide a control method for a PV / T coupled water source heat pump multi-energy complementary tri-generation system, the control method comprising: Real-time data collection includes PV / T module output status, upper, middle and lower temperatures of the heating water tank, hot water storage tank temperature, power supply terminal load demand, and battery charge status. Determine if the temperature at the top of the heating water tank has reached the set heating value; When the temperature at the top of the heating water tank reaches the set heating value, the No. 3 circulating water pump is started to transfer the heat from the heating water tank to the hot water storage tank, and then the hot water storage tank supplies heat to the end of the power supply. When the temperature at the top of the heating water tank is lower than the heating set value, the water source heat pump unit is started to extract heat from the heat source area at the bottom of the heating water tank and supplement the heat to the hot water storage tank. When the temperature of the lower heat source area of ​​the heating water tank is lower than the preset protection temperature, local supplemental heating is performed on the lower heat source area of ​​the heating water tank. Once the temperature in the lower heat source area of ​​the heating water tank returns to the set value, the heat replenishment will stop. The winter heating mode, summer cooling mode, and domestic hot water supply mode are switched according to the load status of the power supply terminal.

[0014] Optionally, in winter heating mode, the solar direct supply mode is implemented first, followed by the water source heat pump supplementary heating mode, and finally the heat source side temperature maintenance mode.

[0015] Optionally, in summer cooling mode, the water source heat pump unit switches to cooling operation, recovers condensation heat to the heating water tank, and outputs domestic hot water to the domestic hot water supply and return interfaces through the domestic hot water heat exchanger.

[0016] This invention proposes a PV / T coupled water source heat pump multi-energy complementary tri-generation system. By setting up a heating water tank directly connected to the plate heat exchanger and an independent hot water storage tank, the functions of the heat source side and the terminal supply side are clearly defined. The heating water tank is specifically responsible for heat storage and temperature maintenance on the heat source side, while the hot water storage tank is specifically responsible for energy storage and supply on the terminal load side. This avoids the problems of chaotic heat organization paths and large fluctuations in heat pump operating conditions caused by functional confusion, while improving the utilization rate of solar energy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a PV / T coupled water source heat pump multi-energy complementary tri-generation system provided in an embodiment of the present invention; Figure 2 A schematic diagram of a direct heating mode for PV / T modules; Figure 3 A schematic diagram of a heating mode where PV / T components are coupled with a water source heat pump unit; Figure 4A schematic diagram of an electric heating backup heating mode; Figure 5 This is a schematic diagram of the power logic. Figure 6 This is a schematic diagram of the internal structure of the heating water tank; In the diagram, 1. PV / T module; 2. No. 1 circulating water pump; 3. Plate heat exchanger; 4. No. 2 circulating water pump; 5. Heating water tank; 6. No. 3 circulating water pump; 7. Evaporator; 8. Condenser; 9. Hot water storage tank; 10. No. 4 circulating water pump; 11. Power supply terminal; 12. Electric heating rod; 13. No. 5 circulating water pump; 14. No. 6 circulating water pump; 15. Water source heat pump unit; 16. Inverter; 17. Battery; 18. External power grid; 19. Domestic hot water heat exchanger; 20. Domestic hot water supply and return interface; 21. Heat source side temperature maintenance component; 22. Layered flow guiding component; 2201. Upper water distribution plate; 2202. First flow guiding baffle; 2203. Second flow guiding baffle; 2204. Lower water collection plate; 23. Temperature detection component. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] Please see Figures 1 to 6 This invention provides a PV / T coupled water source heat pump multi-energy complementary tri-generation system. The system may include: a PV / T module 1, a plate heat exchanger 3, a heating water tank 5, a water source heat pump unit 15, a hot water storage tank 9, and an energy supply terminal 11. The PV / T module 1 is electrically connected to an inverter 16 and a battery 17 for converting, storing, and distributing the electrical energy generated by the PV / T module 1. The plate heat exchanger 3 is connected to the PV / T module 1 via a pipe, and a first circulating water pump 2 is installed on the pipe between the plate heat exchanger 3 and the PV / T module 1. The heating water tank 5 is connected to the plate heat exchanger 3 via a pipe, and a second circulating water pump 4 is installed on the pipe between the heating water tank 5 and the plate heat exchanger 3. The water source heat pump unit 1... 5 is connected to the heating water tank 5 via a pipe. A No. 5 circulating water pump 13 is installed on the pipe between the water source heat pump unit 15 and the heating water tank 5. The hot water storage tank 9 is connected to the heating water tank 5 via a pipe. A No. 3 circulating water pump 6 is installed on the pipe between the hot water storage tank 9 and the heating water tank 5. The hot water storage tank 9 is connected to the water source heat pump unit 15 via a pipe. A No. 6 circulating water pump 14 is installed on the pipe between the hot water storage tank 9 and the water source heat pump unit 15. The power supply terminal 11 is connected to the hot water storage tank 9 via a pipe. A No. 4 circulating water pump 10 is installed on the pipe between the power supply terminal 11 and the hot water storage tank 9. The heating water tank 5 is also connected to a domestic hot water heat exchanger 19. The domestic hot water heat exchanger 19 is equipped with a domestic hot water supply and return interface 20.

[0023] In this embodiment, when photovoltaic radiation is sufficient, the PV / T module 1 absorbs solar energy to generate electricity. The generated electricity is converted by the inverter 16 and can be directly supplied to various electrical devices in the system. Excess electricity is stored in the battery 17 for backup. At the same time, the PV / T module 1 absorbs heat to heat the circulating water. The first circulating water pump 2 drives the circulating water to flow into the plate heat exchanger 3, transferring the heat to the circulating water on the side of the heating water tank 5. The second circulating water pump 4 maintains the continuous heat exchange on this side, so that the heat is stored in the heating water tank 5. When domestic hot water is needed, the heat from the heating tank 5 is directly output as domestic hot water through the domestic hot water heat exchanger 19. When heating or cooling is needed, if the heating tank 5 has sufficient heat, it can be directly transferred to the hot water storage tank 9 via the third circulating water pump 6, and then the hot water storage tank 9 supplies energy to the power supply terminal 11 via the fourth circulating water pump 10 to meet heating needs. If the heating tank 5 has insufficient heat, it provides a low-temperature heat source to the water source heat pump unit 15 via the fifth circulating water pump 13. The water source heat pump unit 15 performs work to produce heat, which is then transferred to the hot water storage tank 9 and supplied to the power supply terminal 11. During summer cooling, the water source heat pump unit 15 directly produces cold water, stores it in the hot water storage tank 9, and supplies it to the power supply terminal 11 to meet cooling needs. The battery 17 can supplement power supply when the photovoltaic output is insufficient, ensuring stable system operation.

[0024] This system clearly defines the functions of the heat source side and the terminal supply side by setting up a heating water tank 5 directly connected to the plate heat exchanger 3 and an independent hot water storage tank 9. The heating water tank 5 is specifically responsible for the heat storage and temperature maintenance function on the heat source side, while the hot water storage tank 9 is specifically responsible for the energy storage and supply function on the terminal load side. This avoids the problems of chaotic heat organization path and large fluctuations in heat pump operating conditions caused by functional confusion, while improving the utilization rate of solar energy.

[0025] Please see Figure 6 In some possible implementations, the heating water tank 5 may include: a tank body, an exhaust port at the top of the tank body, a drain port at the bottom of the tank body, a top side interface on the top side of the tank body, which is connected to the plate heat exchanger 3 through a pipe, and a bottom side interface on the bottom side of the tank body, which is connected to the water source heat pump unit 15 through a pipe; wherein, a layered flow guiding component 22 and a heat source side temperature maintenance component 21 are provided inside the tank body.

[0026] By installing a stratified flow guiding component 22 inside the heating water tank 5, a natural temperature stratification can be formed, enabling the high-temperature water at the top to be preferentially supplied to the terminal for direct supply, while the low-temperature water at the bottom is stably used as the heat source for the heat pump unit, thus improving the efficiency of heat stratification utilization. At the same time, the addition of a heat source side temperature maintenance component 21 can provide local supplementary heating when the heat source temperature at the bottom of the heating water tank 5 is too low, ensuring the stability of the evaporation side temperature of the heat pump. This solves the problem of the heat source side temperature dropping and the insufficient stability of heat pump operation during continuous rainy weather, effectively improving the comprehensive utilization rate of solar energy.

[0027] Please see Figure 1 , Figure 6 In some embodiments, the heat source side temperature maintenance component 21 includes an electric heating rod 12 and a temperature detection component 23. The electric heating rod 12 is disposed at the bottom of the box, and the temperature detection component 23 is disposed in multiple locations distributed in different positions of the box.

[0028] The electric heating rod 12 is submerged in the lower heat source area of ​​the heating water tank 5, and is only used to maintain the minimum operating temperature of the lower heat source area of ​​the heating water tank 5, and does not directly serve as the main heat source for the power supply terminal 11. The temperature detection components 23 are set at different positions in the heating water tank 5 to facilitate the detection of the temperature at different positions in the heating water tank 5.

[0029] Please see Figure 6 In some possible implementations, the layered flow guiding component 22 includes an upper water distribution plate 2201, a first flow guiding baffle 2202, a second flow guiding baffle 2203, and a lower water collection plate 2204, which are sequentially arranged in the box.

[0030] Specifically, the upper water distribution plate 2201 is used to evenly distribute the heat medium from the plate heat exchanger 3 to the upper part of the heating water tank 5, the first flow guide baffle 2202 and the second flow guide baffle 2203 are used to reduce the mixing phenomenon between the upper and lower layers, and the lower water collection plate 2204 is used to guide the low temperature medium at the bottom of the heating water tank 5 to the side of the No. 5 circulating water pump 13.

[0031] Please see Figure 1 In some embodiments, the water source heat pump unit 15 may include an evaporator 7 and a condenser 8, wherein the evaporator 7 is connected to the heating water tank 5 through a pipe, and a fifth circulating water pump 13 is installed on the pipe between the evaporator 7 and the heating water tank 5; the condenser 8 is connected to the hot water storage tank 9 through a pipe, and a sixth circulating water pump 14 is installed on the pipe between the condenser 8 and the hot water storage tank 9.

[0032] In this embodiment, the evaporator 7 is connected to the heating water tank 5 via the No. 5 circulating water pump 13 to form a heat pump heat source side loop; the condenser 8 is connected to the hot water storage tank 9 in winter and to the heating water tank 5 in summer.

[0033] Furthermore, the temperature detection component 23 is a temperature sensor, and three of them are arranged in the upper, middle and lower parts of the box, respectively, to detect the temperature status of different height areas of the box.

[0034] In some possible implementations, the energy supply terminal 11 is at least one of a building heating terminal, a building cooling terminal, or a combined cooling and heating terminal.

[0035] During winter heating season, the system enters different operating modes based on solar irradiance and water tank temperature.

[0036] When solar irradiance is sufficient and the PV / T module 1 outputs a high amount of heat, the heat enters the heating water tank 5 through the plate heat exchanger 3, and the temperature of the heating water tank 5 gradually rises. At this time, if the temperature of the upper part or the whole of the heating water tank 5 reaches the heating set value, the No. 3 circulating water pump 6 starts, transferring the heat to the hot water storage tank 9, and then the No. 4 circulating pump 10 supplies heat to the energy supply terminal 11, realizing direct solar heating.

[0037] When solar radiation weakens and the temperature of the heating water tank 5 is insufficient, the water source heat pump unit 15 starts. At this time, the No. 5 circulating water pump 13 drives the circulating medium in the heating water tank 5 into the evaporator 7. The evaporator 7 absorbs the low-grade heat energy in the heating water tank 5, while the condenser 8 releases the heat to the hot water storage tank 9, which then supplies heat to the power supply terminal 11.

[0038] During the above operation, the heat generated by the PV / T component 1 is preferentially used to supplement the heating water tank 5, so as to maintain the heating water tank 5 at a certain temperature, improve the inlet conditions of the heat pump evaporation side, and improve the operating efficiency of the heat pump.

[0039] During prolonged cloudy days, long nighttime operation, or low-radiation conditions, the water source heat pump unit 15 continuously extracts heat from the heating water tank 5, causing the temperature of the lower heat source area of ​​the heating water tank 5 to drop. If the temperature of the heat source area is too low, the heat absorption capacity of the evaporator 7 will decrease, the evaporation pressure of the heat pump will drop, and thus affect the operational stability of the heat pump.

[0040] To address the aforementioned issues, this invention incorporates a heat source side temperature maintenance component 21 within the heating water tank 5. Specifically, a temperature detection component 23 monitors the temperature of the heat source area within the heating water tank 5 in real time. When the temperature of the heat source area is detected to be lower than a preset protection temperature, the control system activates the electric heating rod 12 to provide localized supplementary heating only to the lower heat source area of ​​the heating water tank 5, thereby maintaining the minimum operating temperature of the heat pump evaporator side.

[0041] Since the electric heating rod 12 only works on the heat source side and does not directly supply heat to the power supply terminal 11, its function is to stabilize the operation of the heat pump, rather than to undertake the main heating task. This setting can ensure the continuous operation of the system under extreme weather conditions without causing ineffective waste of electric heating energy.

[0042] Once the temperature of the heated water tank 5 returns to the set value, the electric heating rod 12 automatically shuts off, and the system re-enters the solar priority or heat pump supplementary heating operation mode.

[0043] In summer, the water source heat pump unit 15 switches to cooling mode, and the energy supply terminal 11 outputs cooling capacity to meet the building's cooling needs. At the same time, the heat released by the condenser 8 preferentially enters the heating water tank 5, and after being superimposed with the heat output by the PV / T module 1, the temperature of the heating water tank 5 increases.

[0044] When there is excess heat in the heating tank 5, heat can be transferred to the domestic hot water supply and return interface 20 through the domestic hot water heat exchanger 19, forming a domestic hot water supply loop, thereby achieving simultaneous supply of building cooling and domestic hot water. This mode can improve the overall utilization efficiency of the system throughout the year and reduce energy loss caused by direct discharge of condensation heat.

[0045] The electrical energy generated by the PV / T module 1 is regulated by the inverter 16 and then prioritized for operation of the water source heat pump unit 15 and each circulating water pump. If there is any residual electrical energy, it is stored in the battery 17. When the battery 17 reaches the set state of charge, the excess electrical energy is used to drive the electric heating rod 12 to provide auxiliary heating for the lower heat source area of ​​the heating water tank 5.

[0046] If the PV / T module 1 generates insufficient power, the battery 17 will be discharged first to supplement the system load. If necessary, the external power grid 18 will provide additional power to ensure the stable operation of the system.

[0047] In summary, this invention constructs a comprehensive energy supply system comprising "PV / T module 1 prioritizing heat collection, heating water tank 5 maintaining heat source, hot water storage tank 9 providing terminal supply, and heat pump supplementary heating and electric heating protection working in tandem." Compared with existing technologies, this invention clearly distinguishes the functional boundaries between the heat source side and the terminal supply side, and achieves stratified utilization of heat within the heating water tank 5 and temperature maintenance on the heat source side through the stratified flow guiding component 22 and the temperature detection component 23. This ensures system engineering simplicity while improving the stability of heat pump operation under low-temperature conditions and the overall annual energy utilization efficiency.

[0048] In some embodiments, the present invention also provides a control method for a PV / T coupled water source heat pump multi-energy complementary tri-generation system, the control method comprising the following steps: S100: Real-time acquisition of PV / T component 1 output status, upper, middle and lower temperatures of heating water tank 5, temperature of hot water storage tank 9, load demand of power supply terminal 11 and charge status of battery 17. S200: Determine whether the temperature at the top of the heating water tank 5 has reached the heating set value; S300. When the temperature at the top of the heating water tank 5 reaches the heating set value, start the No. 3 circulating water pump 6 to transfer the heat from the heating water tank 5 to the hot water storage tank 9, and then supply heat from the hot water storage tank 9 to the power supply terminal 11. S400 When the temperature at the top of the heating water tank 5 is lower than the heating set value, start the water source heat pump unit 15 to extract heat from the heat source area at the bottom of the heating water tank 5 and supplement the heat to the hot water storage tank 9. S500: When the temperature of the lower heat source area of ​​the heating water tank 5 is lower than the preset protection temperature, the lower heat source area of ​​the heating water tank 5 is locally supplemented with heat. S600: When the temperature of the lower heat source area of ​​the heating water tank 5 returns to the set value, the heat replenishment stops. S700 switches between winter heating mode, summer cooling mode, and domestic hot water supply mode according to the load status of the power supply terminal 11.

[0049] Furthermore, in some embodiments, the solar direct supply mode is prioritized in the winter heating mode, followed by the water source heat pump supplementary heating mode, and finally the heat source side temperature maintenance mode.

[0050] Furthermore, in some possible implementations, in summer cooling mode, the water source heat pump unit 15 switches to cooling operation, recovers condensation heat to the heating water tank 5, and outputs domestic hot water to the domestic hot water supply and return interface 20 through the domestic hot water heat exchanger 19.

[0051] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A PV / T coupled water source heat pump multi-energy complementary tri-generation system, characterized in that, include: A PV / T module (1) is electrically connected to an inverter (16) and a battery (17) for converting, storing and distributing the electrical energy generated by the PV / T module (1). A plate heat exchanger (3) is connected to the PV / T assembly (1) via a pipe, and a circulating water pump (2) is installed on the pipe between the plate heat exchanger (3) and the PV / T assembly (1). A heating water tank (5) is connected to the plate heat exchanger (3) through a pipe. A second circulating water pump (4) is installed on the pipe between the heating water tank (5) and the plate heat exchanger (3). A water source heat pump unit (15) is connected to the heating water tank (5) through a pipeline. A No. 5 circulating water pump (13) is installed on the pipeline between the water source heat pump unit (15) and the heating water tank (5). A hot water storage tank (9) is connected to the heating water tank (5) through a pipe. A No. 3 circulating water pump (6) is installed on the pipe between the hot water storage tank (9) and the heating water tank (5). The hot water storage tank (9) is connected to the water source heat pump unit (15) through a pipe. A No. 6 circulating water pump (14) is installed on the pipe between the hot water storage tank (9) and the water source heat pump unit (15). The power supply terminal (11) is connected to the hot water storage tank (9) through a pipe, and a No. 4 circulating water pump (10) is installed on the pipe between the power supply terminal (11) and the hot water storage tank (9). The heating water tank (5) is also connected to a domestic hot water heat exchanger (19), and the domestic hot water heat exchanger (19) is provided with a domestic hot water supply and return interface (20).

2. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 1, characterized in that, The heating water tank (5) includes: The box has an exhaust port at the top and a drain port at the bottom. The top side of the box has a top side interface, which is connected to the plate heat exchanger (3) through a pipe. The bottom side of the box has a bottom side interface, which is connected to the water source heat pump unit (15) through a pipe. The box is equipped with a layered flow guiding component (22) and a heat source side temperature maintenance component (21).

3. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 2, characterized in that, The heat source side temperature maintenance component (21) includes an electric heating rod (12) and the temperature detection component (23). The electric heating rod (12) is located at the bottom of the box, and the temperature detection component (23) is provided in multiple locations distributed in different positions of the box.

4. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 2, characterized in that, The layered flow guiding assembly (22) includes an upper water distribution plate (2201), a first flow guiding baffle (2202), a second flow guiding baffle (2203), and a lower water collection plate (2204) arranged sequentially in the box.

5. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 1, characterized in that, The water source heat pump unit (15) includes: The evaporator (7) is connected to the heating water tank (5) through a pipe, and the No. 5 circulating water pump (13) is installed on the pipe between the evaporator (7) and the heating water tank (5); The condenser (8) is connected to the hot water storage tank (9) via a pipe, and the No. 6 circulating water pump (14) is installed on the pipe between the condenser (8) and the hot water storage tank (9).

6. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 3, characterized in that, The temperature detection component (23) is a temperature sensor, and three of them are arranged in the upper, middle and lower parts of the box, respectively, to detect the temperature status of different height areas of the box.

7. The PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 1, characterized in that, The energy supply terminal (11) is at least one of building heating terminal, building cooling terminal or combined cooling and heating terminal.

8. A control method for a PV / T coupled water source heat pump multi-energy complementary tri-generation system as described in any one of claims 1 to 7, characterized in that, The method includes: Real-time acquisition of PV / T component (1) output status, heating water tank (5) upper, middle and lower temperatures, hot water storage tank (9) temperature, power supply terminal (11) load demand and battery (17) charge status; Determine whether the temperature at the top of the heating water tank (5) has reached the heating set value; When the temperature at the top of the heating water tank (5) reaches the heating set value, the No. 3 circulating water pump (6) is started to transfer the heat from the heating water tank (5) to the hot water storage tank (9), and the hot water storage tank (9) supplies heat to the power supply terminal (11). When the temperature at the top of the heating water tank (5) is lower than the heating set value, the water source heat pump unit (15) is started to extract heat from the heat source area at the bottom of the heating water tank (5) and supplement the heat to the hot water storage tank (9); When the temperature of the lower heat source area of ​​the heating water tank (5) is lower than the preset protection temperature, the lower heat source area of ​​the heating water tank (5) is locally supplemented with heat. When the temperature of the lower heat source area of ​​the heating water tank (5) returns to the set value, the heat replenishment stops; Switch between winter heating mode, summer cooling mode and domestic hot water supply mode based on the load status of the power supply terminal (11).

9. The control method for the PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 8, characterized in that, In winter heating mode, the solar direct supply mode is implemented first, followed by the water source heat pump supplementary heating mode, and finally the heat source side temperature maintenance mode.

10. The control method for the PV / T coupled water source heat pump multi-energy complementary tri-generation system according to claim 8, characterized in that, In summer cooling mode, the water source heat pump unit (15) switches to cooling operation, recovers condensation heat to the heating water tank (5), and outputs domestic hot water to the domestic hot water supply and return interface (20) through the domestic hot water heat exchanger (19).

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