A multi-energy coupled thermal storage heat pump unit

Abstract

This utility model discloses a multi-energy coupled thermal storage heat pump unit, including a hot water storage tank. An electric heater is installed on the hot water storage tank. A first delivery pipe and a second delivery pipe are connected to one side of the hot water storage tank. One end of the first and second delivery pipes is connected to a terminal device. A first connecting pipe is connected to the first delivery pipe, and a second connecting pipe is connected to the second delivery pipe. This utility model achieves efficient heat buffering and release, supports peak shaving and valley filling of electricity, improves grid stability, and utilizes off-peak electricity or stored electricity to supplement the heat in the hot water storage tank at night or on rainy days. It achieves multi-energy coupling, and the system can maintain operation through electric heating and energy storage units, achieving all-weather operation capability. It has high comprehensive energy utilization efficiency, significantly reduces carbon emissions, and alleviates peak electricity demand pressure through energy storage and off-peak electricity utilization, achieving energy-saving and environmental protection benefits.

Description

Technical Field

[0001] This utility model relates to the field of multi-energy coupled thermal storage technology, and in particular to a multi-energy coupled thermal storage heat pump unit. Background Technology

[0002] Generally speaking, a heat pump is an energy-saving device that uses electricity to transfer heat from a low-grade heat source to a high-grade heat source. As the name suggests, a heat pump, like a pump, can convert low-grade heat energy (such as the heat contained in air, soil, and water) that cannot be directly used into usable high-grade heat energy (for purposes such as bathing, heating, and warming), thereby achieving the goal of saving some high-grade energy (such as coal, natural gas, oil, and electricity).

[0003] The power generation efficiency of crystalline silicon photovoltaic (PV) panels depends on their operating temperature; a 1°C increase in temperature leads to a 0.4%-0.5% decrease in output power. Since over 80% of the energy reaching the cell surface is converted into heat, the operating temperature of PV panels is typically above 50°C. Combining PV panels and solar collectors organically forms a PV / T solar collector. This collector removes the generated heat through a medium, controlling the operating temperature of the solar cells and providing more efficient electricity. Furthermore, the removed heat can be used as a heat source for heat pumps, providing heating in northern regions, thus effectively utilizing solar energy and significantly improving its overall efficiency.

[0004] Currently, air source heat pumps are widely used in the heating and domestic hot water market in northern China. However, due to the low winter temperatures in cold regions of my country, with outdoor design temperatures for heating generally ranging from -5℃ to -15℃, current low-ambient-temperature heat pump units can basically meet the usage requirements, but the following problems restrict the application of air source heat pumps in cold regions:

[0005] When the need for heat is greatest, but the ambient temperature is lowest, the performance of the air source heat pump will degrade, resulting in insufficient heating and a poor user experience.

[0006] Air source heat pumps have poor reliability in cold regions. During winter rain and snow, the air humidity is high, and the air source heat pump frosts frequently, requiring frequent switching to defrosting mode, which causes fluctuations in hot water temperature and affects the heating effect.

[0007] Although vapor compression heat pump units have high energy efficiency, their total power consumption is higher compared to traditional heating methods for the entire heating area. Especially considering the performance degradation of air source heat pumps in low-temperature environments, projects are often configured according to the worst operating conditions at the beginning, resulting in huge electricity consumption for heating and increasing the burden on the power grid.

[0008] Therefore, how to simultaneously meet the requirements of heating capacity and reliability is an innovative technology that low ambient temperature heat pumps urgently need to break through. To this end, we propose a multi-energy coupled thermal storage heat pump unit to solve the above problems. Utility Model Content

[0009] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a multi-energy coupled thermal storage heat pump unit.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A multi-energy coupled thermal storage heat pump unit includes a hot water storage tank, an electric heater installed on the hot water storage tank, a first delivery pipe and a second delivery pipe connected to one side of the hot water storage tank, a terminal device connected to one end of the first delivery pipe and the second delivery pipe, a first connecting pipe connected to the first delivery pipe, a second connecting pipe connected to the second delivery pipe, a first fixed pipe connected to one end of each of the first delivery pipe and the second fixed pipe, an evaporator connected to one end of each of the first and second connecting pipes, a second fixed pipe connected to one end of each of the second fixed pipes, and a condenser connected to one end of each of the second fixed pipes. The condenser and the evaporator are connected by two connecting pipes, one of which is equipped with a refrigerant compressor and the other with a throttling valve. Multiple PV / T modules are connected to one side of the hot water storage tank through a circulation structure, a reflux structure is connected to one end of each PV / T module, a heat exchange device is provided on the reflux structure, and one end of the reflux structure is connected to one side of the hot water storage tank.

[0012] Preferably, a fifth electric valve and a first electric valve are installed on both sides of the first conveying pipe, a sixth electric valve and a second electric valve are installed on both sides of the first connecting pipe, an eighth electric valve and a fourth electric valve are installed on both sides of the second conveying pipe, and a seventh electric valve and a third electric valve are installed on both sides of the second connecting pipe.

[0013] Preferably, a water pump is installed at one end of the first delivery pipe, and a water source heat pump is installed on the second delivery pipe.

[0014] Preferably, the circulation structure includes a first circulation pipeline connected to one side of the hot water storage tank, one end of the first circulation pipeline being connected to one side of multiple PV / T components, and an ethylene glycol pump being installed on the first circulation pipeline.

[0015] Preferably, the reflux structure includes a first reflux pipe connected to one side of multiple PV / T components, one end of the first reflux pipe being connected to one side of the hot water storage tank, and a tenth electric valve being installed on the first reflux pipe.

[0016] Preferably, the heat exchange device includes a second circulation pipe connected to the first return pipe, one end of the second circulation pipe is connected to an outdoor heat exchanger, one side of the outdoor heat exchanger is connected to the second return pipe, and one end of the second return pipe is connected to the first return pipe.

[0017] Preferably, one end of the PV / T module is connected to an energy storage unit.

[0018] In this utility model:

[0019] 1. Heating Operation Description:

[0020] The first, fourth, sixth, and seventh electric valves on the water source heat pump side are closed, while the second, third, fifth, and eighth electric valves are open. The flow is: hot water storage tank → water source heat pump → eighth electric valve → evaporator → fifth electric valve → hot water storage tank.

[0021] Terminal equipment → Water pump → Second electric valve → Condenser → Third electric valve → Terminal equipment;

[0022] PV / T side: Hot water storage tank → Ethylene glycol pump → PV / T module → Hot water storage tank;

[0023] Features: The heat source is ethylene glycol (coolant), which does not frost, requires no defrosting, and has no heat loss; the hot water storage tank is located on the heat source side, which can reduce the water volume, reduce the footprint, and lower the insulation standard (the hot water storage tank can be set at 20℃ to meet the heat source requirements). The hot water storage tank can be heated by electricity or gas. Electric heating is achieved by photovoltaic power generation or by using off-peak electricity.

[0024] Working principle explanation:

[0025] When there is sunlight, the photovoltaic panel generates heat while generating electricity. Ethylene glycol (or refrigerant) flows through the photovoltaic panel under the drive of the ethylene glycol pump, carrying away the heat from the photovoltaic panel and storing the heat in the hot water storage tank. The hot water storage tank 34 serves as the heat source of the water source heat pump, and after the work of the compressor, it produces domestic or heating hot water.

[0026] During periods of low heat load, such as when the ambient temperature is high or there is plenty of sunshine, the hot water storage tank can make full use of the PV / T photovoltaic modules to generate electricity and buffer as much heat as possible in the hot water storage tank (at this time, the heat pump system has high energy efficiency and the photovoltaic power generation is large) to cope with nighttime and rainy weather.

[0027] 2. Refrigeration Operating Conditions:

[0028] Water source heat pump side: Second electric valve, third electric valve, fifth electric valve, and eighth electric valve are closed; first electric valve, fourth electric valve, sixth electric valve, and seventh electric valve are open; terminal equipment → water pump → first electric valve → evaporator → fourth electric valve → terminal equipment.

[0029] Hot water storage tank → Water source heat pump → Seventh electric valve → Condenser → Sixth electric valve → Hot water storage tank;

[0030] PV / T side: Hot water storage tank → Ethylene glycol pump → PV / T module → Hot water storage tank;

[0031] During the day, when the photovoltaic panel temperature is high, the ninth electric valve is opened and the tenth electric valve is closed, allowing the heat from the photovoltaic panel to be dissipated into the ambient air through the outdoor heat exchanger. At night, the glycol pump can be started, the tenth electric valve is opened and the ninth electric valve is closed, making full use of the surface area of ​​the PV / T to dissipate heat into the ambient air. At this time, the outdoor heat exchanger acts as an auxiliary device (proportional tenth electric valve, proportionally closed ninth electric valve, or timed opening of the tenth electric valve, timed closing of the ninth electric valve).

[0032] Working principle explanation:

[0033] During the day when there is sunlight: the photovoltaic panels generate electricity to power the heat pump for cooling (at this time, the heat pump is in cooling mode). The heat pump produces warm water of about 30-35°C in the condenser, which enters the hot water storage tank. At this time, the ethylene glycol pump draws water (refrigerant) from the hot water storage tank, opens the ninth electric valve and closes the tenth electric valve, and dissipates the heat from the photovoltaic panels into the ambient air through the outdoor heat exchanger, maintaining the temperature of the water (refrigerant) in the hot water storage tank at about 30°C, ensuring the heat dissipation capacity of the heat pump unit in cooling mode.

[0034] At night: The air conditioner still needs to be turned on in the room for cooling. At this time, the temperature of the photovoltaic panel is low and the heat dissipation area is large. The photovoltaic panel is used as a heat sink to dissipate the heat of the condenser into the ambient air. At this time, the outdoor heat exchanger can also be used as an auxiliary heat sink (open the ninth electric valve and close the tenth electric valve).

[0035] This utility model has the following advantages:

[0036] 1. Photovoltaic and heat pump synergy: Photovoltaic panels generate electricity to drive the heat pump, while using their waste heat to raise the temperature of the heat pump's heat source, achieving efficient heat buffering and release, supporting peak shaving and valley filling of electricity, improving grid stability, and using off-peak electricity or stored electricity to supplement the heat of the hot water storage tank at night or on rainy days, achieving multi-energy coupling.

[0037] 2. To avoid frost problems, the heat source is a refrigerant circulation system that does not rely on air, thus avoiding the impact of frost and improving low-temperature performance. The hot water storage tank serves as a constant-temperature heat source, ensuring the efficient operation of the heat pump at low temperatures. Through heat storage and power dispatching, the installed capacity of the heat pump is reduced, and the peak power consumption is lowered.

[0038] 3. During the day, it operates efficiently by using photovoltaic power supply, photovoltaic panel heat dissipation, and hot water storage tank for energy storage. At night, it operates stably by relying on hot water storage tank and energy storage unit to ensure uninterrupted power supply at night. It is highly adaptable to cloudy and rainy weather and can maintain system operation through electric heating and energy storage unit to achieve all-weather operation capability.

[0039] 4. High energy efficiency: Solar photovoltaic and solar thermal energy are used simultaneously, increasing the overall efficiency to over 80%, replacing traditional heating methods, significantly reducing carbon emissions, and alleviating peak electricity demand through energy storage and off-peak electricity utilization, thus achieving energy-saving and environmental protection benefits.

[0040] In summary, this invention achieves efficient heat buffering and release, supports peak shaving and valley filling of electricity, improves grid stability, and utilizes off-peak electricity or stored electricity to supplement the heat storage tank at night or on rainy days, realizing multi-energy coupling. The system can maintain operation through electric heating and energy storage units, achieving all-weather operation capability. It has high comprehensive energy utilization efficiency, significantly reduces carbon emissions, and alleviates peak electricity demand pressure through energy storage and off-peak electricity utilization, achieving energy-saving and environmental protection benefits. Attached Figure Description

[0041] Figure 1 This is a connection structure diagram of the present invention.

[0042] In the diagram: 1 Water pump, 2 First electric valve, 3 Second electric valve, 4 First connecting pipe, 5 First delivery pipe, 6 Fifth electric valve, 7 Sixth electric valve, 8 First fixed pipe, 9 Evaporator, 10 Refrigerant compressor, 11 Condenser, 12 Second fixed pipe, 13 Terminal equipment, 14 Water source heat pump, 15 Connecting pipe, 16 Throttling valve, 17 Seventh electric valve, 18 Eighth electric valve, 19 Second delivery pipe, 20 Second connecting pipe, 21 Third electric valve, 22 Fourth electric valve, 23 Electric heater, 24 Ethylene glycol pump, 25 First circulation pipeline, 26 First return pipeline, 27 Ninth electric valve, 28 Tenth electric valve, 29 PV / T module, 30 Energy storage unit, 31 Outdoor heat exchanger, 32 Second circulation pipeline, 33 Second return pipeline, 34 Hot water storage tank. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0044] Reference Figure 1 A multi-energy coupled thermal storage heat pump unit includes a hot water storage tank 34, which adopts a sandwich structure with an outer insulation layer (such as polyurethane foam) to reduce heat loss.

[0045] An electric heater 23 is installed on the hot water storage tank 34. The electric heater 23 is equipped with an overheat protector and a leakage protection switch to ensure safe operation.

[0046] The hot water storage tank 34 is connected to a first conveying pipe 5 and a second conveying pipe 19 on one side. The conveying pipes are made of high-temperature resistant and corrosion-resistant stainless steel corrugated pipes or PVC composite insulation pipes.

[0047] One end of the first conveying pipe 5 and the second conveying pipe 19 are connected to the terminal device 13. The terminal device 13 includes a floor heating system, a fan coil unit, a hot water supply system, etc., to realize multi-functional thermal energy utilization, support IoT remote control module, and can be integrated with building automation system.

[0048] The first conveying pipe 5 is connected to the first connecting pipe 4. Each connecting pipe and conveying pipe is equipped with a pressure sensor to achieve precise control and system balance.

[0049] A second connecting pipe 20 is connected to the second conveying pipe 19. One end of the first conveying pipe 5 and the second conveying pipe 19 are both connected to a first fixed pipe 8. One end of the two first fixed pipes 8 is connected to an evaporator 9. One end of the first connecting pipe 4 and the second connecting pipe 20 are both connected to a second fixed pipe 12. One end of the two second fixed pipes 12 is connected to a condenser 11. The condenser 11 and the evaporator 9 are connected by two connecting pipes 15. The evaporator 9 and the condenser 11 adopt finned tube or plate heat exchangers to improve heat exchange efficiency.

[0050] One of the connecting pipes 15 is equipped with a refrigerant compressor 10. The refrigerant compressor 10 uses environmentally friendly refrigerants such as R134a and R410A, which meet environmental protection requirements. The refrigerant compressor 10 adopts frequency regulation control to adjust the operating power according to load changes and reduce energy consumption.

[0051] Another connecting pipe 15 is equipped with a throttle valve 16. One side of the hot water storage tank 34 is connected to multiple PV / T components 29 through a circulation structure. One end of the PV / T component 29 is connected to a return structure. The return structure is equipped with a heat exchange device. One end of the return structure is connected to one side of the hot water storage tank 34. The throttle valve 16 is an electronic expansion valve to achieve precise control of the refrigerant flow and improve system stability.

[0052] The first conveying pipe 5 is equipped with a fifth electric valve 6 and a first electric valve 2 on both sides respectively. The first connecting pipe 4 is equipped with a sixth electric valve 7 and a second electric valve 3 on both sides respectively. The second conveying pipe 19 is equipped with an eighth electric valve 18 and a fourth electric valve 22 on both sides respectively. The second connecting pipe 20 is equipped with a seventh electric valve 17 and a third electric valve 21 on both sides respectively. A water pump 1 is installed at one end of the first conveying pipe 5. A water source heat pump 14 is installed on the second conveying pipe 19.

[0053] The circulation structure includes a first circulation pipe 25 connected to one side of the hot water storage tank 34. One end of the first circulation pipe 25 is connected to one side of multiple PV / T components 29. An ethylene glycol pump 24 is installed on the first circulation pipe 25. The ethylene glycol pump 24 is equipped with a variable frequency pump controller to adjust the pump speed according to the heat output of the PV / T components 29 to improve energy efficiency.

[0054] The reflux structure includes a first reflux pipe 26 connected to one side of multiple PV / T components 29. One end of the first reflux pipe 26 is connected to one side of the hot water storage tank 34. A tenth electric valve 28 is installed on the first reflux pipe 26. A temperature sensor is provided on the reflux pipe to determine whether the heat exchange device needs to be started or the operating mode needs to be switched.

[0055] The heat exchange device includes a second circulation pipe 32 connected to the first return pipe 26. One end of the second circulation pipe 32 is connected to an outdoor heat exchanger 31. One side of the outdoor heat exchanger 31 is connected to a second return pipe 33. One end of the second return pipe 33 is connected to the first return pipe 26. The outdoor heat exchanger 31 is an air-cooled heat exchanger to achieve the synergistic utilization of air and geothermal energy.

[0056] One end of the PV / T module 29 is connected to an energy storage unit 30. The PV / T module 29 integrates a photovoltaic panel and a solar collector to achieve the dual functions of power generation and heating. The energy storage unit 30 includes electrochemical energy storage (such as lithium batteries), mechanical energy storage (compressed air), or thermochemical energy storage to achieve multi-energy complementarity. The energy storage unit 30 is connected to an energy management system (EMS) to achieve peak shaving and valley filling and dynamic scheduling of energy.

[0057] In this utility model:

[0058] 1. Heating Operation Description:

[0059] The first electric valve 2, the fourth electric valve 22, the sixth electric valve 7, and the seventh electric valve 17 on the water source heat pump side are closed, while the second electric valve 3, the third electric valve 21, the fifth electric valve 6, and the eighth electric valve 18 are opened. The hot water storage tank 34 → water source heat pump 14 → eighth electric valve 18 → evaporator 9 → fifth electric valve 6 → hot water storage tank 34.

[0060] Terminal device 13 → Water pump 1 → Second electric valve 3 → Condenser 11 → Third electric valve 21 → Terminal device 13.

[0061] PV / T side: Hot water storage tank 34 → Ethylene glycol pump 24 → PV / T module 29 → Hot water storage tank 34;

[0062] Features: The heat source is ethylene glycol (coolant), which does not frost, requires no defrosting, and has no heat loss; the hot water storage tank is located on the heat source side, which can reduce the water volume, reduce the footprint, and lower the insulation standard (the hot water storage tank can be set at 20℃ to meet the heat source requirements); the hot water storage tank adopts an electric heating mode, and the electric heating is achieved by photovoltaic power generation or by using off-peak electricity.

[0063] Working principle explanation:

[0064] When there is sunlight, the photovoltaic panel generates heat while generating electricity. Ethylene glycol (or refrigerant) flows through the photovoltaic panel under the drive of the ethylene glycol pump 24, carrying away the heat from the photovoltaic panel and storing the heat in the hot water storage tank. The hot water storage tank 34 serves as the heat source of the water source heat pump, and after the work of the compressor, it produces domestic or heating hot water.

[0065] During periods of low heat load, such as when the ambient temperature is high or there is plenty of sunshine, the hot water storage tank 34 can fully utilize the PV / T photovoltaic panel modules to generate electricity and buffer as much heat as possible in the hot water storage tank 34 (at this time, the heat pump system has high energy efficiency and the photovoltaic power generation is large) to cope with nighttime and rainy weather.

[0066] 2. Refrigeration Operating Conditions:

[0067] Water source heat pump side: Second electric valve 3, third electric valve 21, fifth electric valve 6, and eighth electric valve 18 are closed, first electric valve 2, fourth electric valve 22, sixth electric valve 7, and seventh electric valve 17 are open, terminal device 13 → water pump 1 → first electric valve 2 → evaporator 9 → fourth electric valve 22 → terminal device 13;

[0068] Hot water storage tank 34 → Water source heat pump 14 → Seventh electric valve 17 → Condenser 11 → Sixth electric valve 7 → Hot water storage tank 34;

[0069] PV / T side: Hot water storage tank 34 → Ethylene glycol pump 24 → PV / T module 29 → Hot water storage tank 34;

[0070] During the day, when the photovoltaic panel temperature is high, the ninth electric valve 27 is opened and the tenth electric valve 28 is closed, allowing the heat from the photovoltaic panel to be dissipated into the ambient air through the outdoor heat exchanger. At night, the ethylene glycol pump 24 can be started, the tenth electric valve 28 is opened and the ninth electric valve 27 is closed, making full use of the surface area of ​​the PV / T to dissipate heat into the ambient air. At this time, the outdoor heat exchanger acts as an auxiliary device (proportional tenth electric valve 28, proportionally closed ninth electric valve 27, or timed opening of tenth electric valve 28, timed closing of ninth electric valve 27).

[0071] Working principle explanation:

[0072] During the day when there is sunlight: the photovoltaic panels generate electricity to supply the heat pump for cooling (at this time, the heat pump is in cooling mode). The heat pump produces warm water of about 30-35°C in the condenser, which enters the hot water storage tank. At this time, the ethylene glycol pump 24 draws water (refrigerant) from the hot water storage tank, opens the ninth electric valve 27 and closes the tenth electric valve 28, and dissipates the heat from the photovoltaic panels into the ambient air through the outdoor heat exchanger 31, maintaining the temperature of the water (refrigerant) in the hot water storage tank at about 30°C, ensuring the heat dissipation capacity of the heat pump unit in cooling mode.

[0073] At night: The room still needs to be cooled by air conditioning. At this time, the temperature of the photovoltaic panel is low and the heat dissipation area is large. The photovoltaic panel acts as a heat sink to dissipate the heat of the condenser into the ambient air. At this time, the outdoor heat exchanger can also act as an auxiliary heat sink (open the ninth electric valve 27 and close the tenth electric valve 28).

[0074] Application scenarios of this utility model:

[0075] Residential heating and hot water supply; central air conditioning systems for commercial buildings; agricultural greenhouse heating systems; industrial waste heat recovery and reuse; off-grid energy systems in remote areas;

[0076] In this utility model:

[0077] 1. A water source heat pump is used, where the temperature of the heat source side is higher than that of the air, and the evaporation temperature of the heat pump is higher than that of a heat pump with a low ambient temperature. The specific heat of water is much greater than that of air, so the heat source is stable and the heat exchange efficiency is high, resulting in stable performance and heating output of the heat pump.

[0078] 2. The water (coolant) used for heat dissipation by photovoltaic panels serves as the heat source for the water source heat pump. There is no frost formation on the evaporator side of the heat pump system, so there is no need to switch refrigerants for defrosting, and there is no heat loss from defrosting (air source heat pumps require regular defrosting, during which the user side is in cooling mode, which will lower the temperature of the heating water and affect comfort). The heat pump system operates stably.

[0079] 3. The heating and cooling of the water source heat pump are switched via the water circuit, which avoids some of the adverse factors of refrigerant switching and ensures the stability of the heat pump system.

[0080] 4. The hot water storage tank adopts an electric heating mode, which can utilize photovoltaic power generation or off-peak electricity for heating;

[0081] 5. Make full use of the heat dissipation capacity of PVT at night in summer to reduce the work done by fans and improve energy efficiency;

[0082] 6. Make full use of photovoltaic panels to generate electricity and save on the power costs of the heat pump system.

[0083] In this utility model:

[0084] 1. Compared with traditional air source heat pumps, this system uses PV / T photovoltaic panel waste heat to ensure the stability of the heat source under various outdoor weather conditions in winter. A hot water storage tank is set up on the heat source side to store heat, providing a stable measure at the heat source end, which can stably provide heating under various outdoor weather conditions in winter.

[0085] 2. The system is equipped with a hot water storage tank to cope with extreme weather. It makes full use of the heat pump in this system to store heat when the ambient temperature is high and the solar radiation intensity is high (when the heat load is low), and to release heat during periods of high heat load demand (night, rainy weather, etc.) to ensure the stability of the heat source of the water source heat pump. At night and during rainy weather, off-peak electricity, photovoltaic power generation or waste heat from natural gas are used to maintain the temperature in the hot water storage tank, maintain the stability of the heat source, and reduce the impact of extreme weather on the heat pump.

[0086] 3. The hot water storage tank is located on the heat source side, which can reduce the water volume, reduce the floor space, and lower the insulation standard (the hot water storage tank can be set at 20℃ to meet the heat source requirements). The size of the hot water storage tank can be determined according to the heating load and heat pump heating capacity under extreme weather conditions.

[0087] 4. The water (coolant) used for heat dissipation from the photovoltaic panels serves as the heat source for the water source heat pump. There is no frost formation on the evaporator side of the heat pump system, and there is no need to switch refrigerants for defrosting. There is no heat loss during defrosting (air source heat pumps require regular defrosting, during which the user side is in cooling mode, which will lower the temperature of the heating water and affect comfort). The heat pump system operates stably.

[0088] 5. Summer cooling during the day when there is sunshine: The photovoltaic panels generate electricity to supply the heat pump for cooling (at this time, the heat pump is in cooling mode). The heat pump produces warm water of about 30-35°C in the condenser, which enters the hot water storage tank. At this time, the ethylene glycol pump draws water (refrigerant) from the hot water storage tank, opens the ninth electric valve and closes the tenth electric valve, and dissipates the heat from the photovoltaic panels into the ambient air through the outdoor heat exchanger, maintaining the temperature of the water (refrigerant) in the hot water storage tank at about 30°C, ensuring the heat dissipation capacity of the heat pump unit in cooling mode.

[0089] 6. PV / T photovoltaic panels have a large area. During the summer nights when cooling is still needed, the heat dissipation capacity of PV / T photovoltaic panels can be fully utilized, the operation of outdoor heat exchangers can be turned off, energy can be saved, and the power generation of photovoltaic panels can be fully utilized, which can reduce the power configuration of heat pump systems, reduce grid usage, and reduce operating costs.

[0090] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A multi-function coupled heat accumulation heat pump unit comprising a heat accumulation water tank (34), characterized in that, An electric heater (23) is installed on the hot water storage tank (34). A first conveying pipe (5) and a second conveying pipe (19) are connected to one side of the hot water storage tank (34). One end of the first conveying pipe (5) and the second conveying pipe (19) are connected to a terminal device (13). A first connecting pipe (4) is connected to the first conveying pipe (5), and a second connecting pipe (20) is connected to the second conveying pipe (19). One end of the first conveying pipe (5) and the second conveying pipe (19) are both connected to a first fixed pipe (8). One end of the two first fixed pipes (8) is connected to an evaporator (9). The first connecting pipe (4) and the second connecting pipe (20) are connected to the evaporator (20). One end of each of the two fixed pipes (12) is connected to a second fixed pipe (12). One end of each of the two fixed pipes (12) is connected to a condenser (11). The condenser (11) and the evaporator (9) are connected by two connecting pipes (15). A refrigerant compressor (10) is installed on one of the connecting pipes (15), and a throttling valve (16) is installed on the other connecting pipe (15). A plurality of PV / T components (29) are connected to one side of the hot water storage tank (34) through a circulation structure. One end of the PV / T component (29) is connected to a reflux structure. A heat exchange device is provided on the reflux structure. One end of the reflux structure is connected to one side of the hot water storage tank (34).

2. The multi-capacity coupled heat accumulation heat pump unit according to claim 1, characterized in that: The first conveying pipe (5) is equipped with a fifth electric valve (6) and a first electric valve (2) on both sides respectively. The first connecting pipe (4) is equipped with a sixth electric valve (7) and a second electric valve (3) on both sides respectively. The second conveying pipe (19) is equipped with an eighth electric valve (18) and a fourth electric valve (22) on both sides respectively. The second connecting pipe (20) is equipped with a seventh electric valve (17) and a third electric valve (21) on both sides respectively.

3. The multi-capacity heat storage heat pump unit according to claim 1, wherein: A water pump (1) is installed at one end of the first delivery pipe (5), and a water source heat pump (14) is installed on the second delivery pipe (19).

4. The multi-capacity heat storage heat pump unit according to claim 1, wherein: The circulation structure includes a first circulation pipe (25) connected to one side of the hot water storage tank (34), one end of the first circulation pipe (25) being connected to one side of a plurality of PV / T components (29), and an ethylene glycol pump (24) being installed on the first circulation pipe (25).

5. The multi-capacity heat storage heat pump unit according to claim 1, wherein: The reflux structure includes a first reflux pipe (26) connected to one side of multiple PV / T components (29), one end of the first reflux pipe (26) being connected to one side of the hot water storage tank (34), and a tenth electric valve (28) being installed on the first reflux pipe (26).

6. A multi-capacity heat storage heat pump unit according to claim 5, wherein: The heat exchange device includes a second circulation pipe (32) connected to the first return pipe (26), one end of the second circulation pipe (32) is connected to an outdoor heat exchanger (31), one side of the outdoor heat exchanger (31) is connected to a second return pipe (33), and one end of the second return pipe (33) is connected to the first return pipe (26).

7. The multi-capacity heat storage heat pump unit according to claim 1, wherein: One end of the PV / T module (29) is connected to an energy storage unit (30).

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