Photovoltaic energy storage and supply system

Abstract

The utility model discloses a photovoltaic energy storage and supply system, which comprises a plurality of solar heat collection pipes, a plurality of solar photovoltaic panels, a solar water collection tank, a photovoltaic controller, a plurality of energy storage battery packs, a first water source heat pump unit, a second water source heat pump unit and a constant-temperature water tank, wherein an electric heater is annularly arranged in the constant-temperature water tank; a middle pipeline is communicated between the water source outlet end of the first water source heat pump unit and the water source inlet end of the second water source heat pump unit; a heat exchanger is arranged between the middle pipeline and the constant-temperature water tank. The first water source heat pump unit and the second water source heat pump unit can be used in a series connection or parallel connection mode, during series connection, water subjected to heat exchange through the water source side of the first water source heat pump exchanges heat with water from the constant-temperature water tank through the secondary side of the heat exchanger, and the temperature is increased; and then the medium enters the water source side of the second water source heat pump unit for heat exchange so as to ensure that the medium temperature of the energy supply side of the water source heat pump unit is gradually and stably increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage and supply systems, and specifically relates to a photovoltaic energy storage and supply system. Background Art

[0002] Solar water heaters are used to heat domestic water to meet the needs of hot water users; solar photovoltaic panels are used to receive sunlight and convert light energy into electrical energy for use at the power end; water source heat pump units are used to obtain water source energy on the water source side to increase the temperature change on the energy supply side to provide energy to the user end; based on the needs of multi-energy combination and complementarity, solar water heaters can be used in combination with water source heat pumps and solar photovoltaic panels. Based on this, it is necessary to study an energy supply system that can combine multiple energies and operate stably with each other. Utility Model Content

[0003] In response to the above technical problems, the purpose of the present invention is to provide a photovoltaic energy storage and supply system that combines solar energy with a water source heat pump unit.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The photovoltaic energy storage and supply system includes multiple solar heat collecting tubes, multiple solar photovoltaic panels, a solar water collection tank, a photovoltaic controller, multiple energy storage battery packs, a first water source heat pump unit, a second water source heat pump unit, and a constant temperature water tank. The multiple solar heat collecting tubes are connected to the solar water collection tank, the multiple solar photovoltaic panels are electrically connected to the photovoltaic controller, and the photovoltaic controller is electrically connected to the multiple energy storage battery packs.

[0006] An electric heater is provided in the constant temperature water tank, and the electric heater is arranged in a ring along the constant temperature water tank. The photovoltaic controller is electrically connected to the heating controller, and the heating controller is electrically connected to the electric heater;

[0007] The photovoltaic controller is connected to the power grid, a first switch is provided between the power grid and the heating controller, and a second switch is provided between the photovoltaic controller and the heating controller;

[0008] The water source inlet end of the first water source heat pump unit and the water source inlet end of the second water source heat pump unit are respectively installed with a water inlet control valve, the water source outlet end of the first water source heat pump unit and the water source outlet end of the second water source heat pump unit are respectively installed with a water outlet control valve, and an intermediate pipe is connected between the water source outlet end of the first water source heat pump unit and the water source inlet end of the second water source heat pump unit, and an intermediate control valve is installed on the intermediate pipe;

[0009] A heat exchanger is provided between the intermediate pipe and the constant temperature water tank. The primary side of the heat exchanger is connected to the constant temperature water tank, the secondary side of the heat exchanger is connected in parallel with both ends of the intermediate pipe, and the intermediate control valve is located in the middle of the intermediate pipe.

[0010] As a further embodiment, the solar water collection tank is connected to a first discharge pipe and a second discharge pipe;

[0011] A heat exchange pipe is arranged in the center of the constant temperature water tank, and a first discharge pipe is connected to one end of the heat exchange pipe; the other end of the heat exchange pipe is connected to a discharge intermediate pipe, and the discharge intermediate pipe is connected to the second discharge pipe. Discharge control valves are respectively installed on the first discharge pipe and the second discharge pipe.

[0012] The discharge intermediate pipe and the second discharge pipe are connected to a discharge main pipe, a mixer is installed on the discharge main pipe, the mixer is connected to a cold water pipe, and the discharge main pipe is connected to the hot water user end.

[0013] As a further embodiment, the primary side outlet end of the heat exchanger is connected to a bypass pipe, which is connected to the discharge intermediate pipe. Flow control valves are respectively installed at the primary side inlet and outlet ends of the heat exchanger. The flow control valve on the primary side outlet end of the heat exchanger is located between the constant temperature water tank and the bypass pipe.

[0014] As a further embodiment, it also includes a water supply pipe, which is connected to the cold water pipe, the constant temperature water tank, and the water supply end of the solar heat collecting pipe.

[0015] As a further implementation method, the energy supply inlet of the first water source heat pump unit, the energy supply inlet of the second water source heat pump unit, the energy supply outlet of the first water source heat pump unit, and the energy supply outlet of the second water source heat pump unit are respectively installed with energy supply control valves, and the energy supply outlet of the first water source heat pump unit and the energy supply inlet of the second water source heat pump unit are connected by an energy supply connecting pipe, and an energy supply connecting control valve is installed on the energy supply connecting pipe.

[0016] As a further embodiment, it also includes a water intake tank, which is connected in parallel with the water inlet end of the first water source heat pump unit and the water inlet end of the second water source heat pump unit; temperature sensors are respectively provided in the water intake tank, the constant temperature water tank, and the solar water collection tank.

[0017] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The electric heater is arranged in a ring along the constant temperature water tank to increase the heating area of ​​the electric heater and the water in the constant temperature water tank and improve the heating efficiency.

[0019] 2. When the lighting conditions are poor and the amount of electricity in the energy storage battery pack is lower than the set residual value, the first switch is turned on and the second switch is turned off to use the grid to power the electric heater. When the amount of electricity in the energy storage battery pack is higher than the set residual value, the first switch is turned off and the second switch is turned on to use photovoltaic electricity to power the electric heater, thereby ensuring the stable operation of the electric heater.

[0020] 3. When the first water source heat pump unit and the second water source heat pump unit are used in series, the water for heat exchange is formed on the water source side of the first water source heat pump, and then passes through the secondary side of the heat exchanger to exchange heat with the water from the constant temperature water tank, and the temperature is increased. Then, the water enters the water source side of the second water source heat pump unit for heat exchange, thereby ensuring that the medium temperature on the energy supply side of the water source heat pump unit is gradually and steadily increased.

[0021] 4. The first water source heat pump unit and the second water source heat pump unit can be used in series or parallel, which is flexible and can meet more energy supply conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the system structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the connection between the first and second water source heat pump units in the present utility model;

[0024] The reference numerals in the accompanying drawings represent the following:

[0025] 10. Solar collector tube, 11. Solar photovoltaic panel, 12. Solar water collection tank, 13. Photovoltaic controller, 14. Energy storage battery pack, 15. First water source heat pump unit, 16. Second water source heat pump unit, 17. Constant temperature water tank, 18. First switch, 19. Second switch, 20. First water inlet control valve, 21. Second water inlet control valve, 22. First water outlet control valve, 23. Second water outlet control valve, 24. Intermediate pipeline, 25. Intermediate control valve, 26. Heat exchanger, 27. Inlet control valve, 28. First discharge pipeline, 2 9. Second discharge pipe, 30. Heat exchange pipe, 31. Discharge intermediate pipe, 32. Discharge control valve, 33. Discharge main pipe, 34. Mixer, 35. Cold water pipe, 36. Bypass pipe, 37. Circulation control valve, 38. Water supply pipe, 39. First energy supply control valve, 40. Second energy supply control valve, 41. Third energy supply control valve, 42. Fourth energy supply control valve, 43. Energy supply connecting pipe, 44. Energy supply connecting control valve, 45. Water intake tank, 46. Temperature sensor, 47. Energy storage backup battery pack, 48. Heating controller. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See Figure 1 、 2 As shown, the photovoltaic energy storage and supply system includes multiple solar heat collecting tubes 10, multiple solar photovoltaic panels 11, a solar water collection tank 12, a photovoltaic controller 13, multiple energy storage battery groups 14, a first water source heat pump unit 15, a second water source heat pump unit 16, and a constant temperature water tank 17. Among them, multiple solar heat collecting tubes 10 can heat the water therein when receiving sunlight, and the generated high-temperature water is sent to the solar water collecting tank 12 for storage. The solar water collecting tank 12 has an insulation function to keep the high-temperature water inside warm; the solar photovoltaic panel 11 is used to receive light, convert electrical energy, and store the converted electrical energy into the energy storage battery group 14 through the photovoltaic controller 13. An energy storage battery group 14 is placed in the energy storage cabinet to store the electricity generated by the solar photovoltaic panel 11. The photovoltaic controller 13 is used to control the charging and discharging of the energy storage battery group 14; the first water source heat pump unit 15 and the second water source heat pump unit 16 supply energy to users by obtaining the temperature on the water source side; the constant temperature water tank 17 is used to store hot water with a temperature within a certain range, and the temperature inside it is slightly lower than the water temperature in the solar water collecting tank 12.

[0028] Multiple solar heat collecting tubes 10 are connected to a solar water collection tank 12. When the water temperature in the solar heat collecting tubes 10 reaches a set temperature, a valve is opened, and the water in the solar heat collecting tubes 10 flows into the solar water collection tank 12 for centralized collection. Multiple solar photovoltaic panels 11 are electrically connected to a photovoltaic controller 13, which is electrically connected to multiple energy storage batteries 14. An electric heater is installed in a constant temperature water tank 17. The electric heater is arranged in a ring along the constant temperature water tank 17. The heating portion of the electric heater does not contact the inner wall of the constant temperature water tank 17. The electric heater uses a commonly used electric heating device, but adopts a ring-shaped arrangement to increase the heating area and improve heating efficiency. The photovoltaic controller 13 is electrically connected to a heating controller 48, which is electrically connected to the electric heater. When the electric heater needs to heat, the photovoltaic controller 13 transmits electrical energy from the energy storage battery 14 to the electric heater, causing the electric heater to operate and heat. When the power stored in the energy storage battery 14 falls below a set value, the electric heater can also be powered by the power grid.

[0029] The photovoltaic controller 13 is connected to the power grid. When the amount of electricity generated by the solar photovoltaic panel 11 is greater than the storage capacity of all the energy storage battery groups 14, the photovoltaic controller 13 is used to connect to the power grid for power grid use. An electric energy meter is installed between the photovoltaic controller 13 and the power grid to detect the amount of electricity transmitted to the power grid. A first switch 18 is provided between the power grid and the heating controller 48, and a second switch 19 is provided between the photovoltaic controller 13 and the heating controller 48. When the lighting conditions are poor and the amount of electricity in the energy storage battery group 14 is lower than the set residual value, the first switch 18 is opened and the second switch 19 is closed, and the power grid is used to power the electric heater. When the amount of electricity in the energy storage battery group 14 is higher than the set residual value, the first switch 18 is closed and the second switch 19 is opened, and the photovoltaic electricity is used to power the electric heater, so as to ensure the stable operation of the electric heater.

[0030] The water source inlet end of the first water source heat pump unit 15 and the water source inlet end of the second water source heat pump unit 16 are respectively installed with water inlet control valves, that is, the water source inlet end of the first water source heat pump unit 15 is installed with a first water inlet control valve 20, and the water source inlet end of the second water source heat pump unit 16 is installed with a second water inlet control valve 21. The water source outlet end of the first water source heat pump unit 15 and the water source outlet end of the second water source heat pump unit 16 are respectively installed with water outlet control valves, that is, the water source outlet end of the first water source heat pump unit 15 is installed with a first water outlet control valve 22, and the water source outlet end of the second water source heat pump unit 16 is installed with a second water outlet control valve 23. The water source outlet end of the first water source heat pump unit 15 and the water source inlet end of the second water source heat pump unit 16 are connected by an intermediate pipe. The intermediate pipe 24 is provided with an intermediate control valve 25; the first water source heat pump unit 15 and the second water source heat pump unit 16 can be operated in series or parallel to meet different energy supply requirements; wherein, the parallel mode is: open the first water inlet control valve 20, the second water inlet control valve 21, the first water outlet control valve 22, the second water outlet control valve 23, and close the intermediate control valve, so as to realize the parallel water intake of the water source side of the two water source heat pump units; wherein, the series mode is: open the first water inlet control valve 20, the intermediate control valve, the second water outlet control valve 23, and close the second water inlet control valve 21 and the first water outlet control valve 22, so as to realize the series water intake of the water source side of the two water source heat pump units.

[0031] Among them, the series connection mode of the water source side of the two water source heat pump units is mainly to adapt to the multi-stage operation of the medium at the energy supply end through the two water source heat pump units, so that the medium temperature rises steadily to ensure the stability of energy supply; thus, a heat exchanger 26 is arranged between the intermediate pipe 24 and the constant temperature water tank 17, and the primary side of the heat exchanger 26 is connected to the constant temperature water tank 17, so that the water in the constant temperature water tank 17 flows through the primary side of the heat exchanger 26, and the secondary side of the heat exchanger 26 is connected in parallel with the two ends of the intermediate pipe 24. An inlet control valve 27 is installed on the pipe on the secondary side of the heat exchanger 26 to control the water on the water source side of the water source heat pump unit to pass into the secondary side of the heat exchanger 26. The intermediate control valve is located in the middle of the intermediate pipe 24. This is mainly used when the first water source heat pump unit 15 and the second water source heat pump unit 16 are connected in series. Specifically, open the first water inlet control valve 20, the second water outlet control valve 23, and the entry control valve, and close the second water inlet control valve 21, the first water outlet control valve 22, and the intermediate control valve. In this way, the water first passes through the water source side of the first water source heat pump to form heat exchange, and then passes through the secondary side of the heat exchanger 26 to exchange heat with the water from the constant temperature water tank 17, and the temperature is increased. Then, heat is exchanged in the water source side of the second water source heat pump unit 16, so as to ensure that the medium temperature on the energy supply side of the water source heat pump unit is gradually and steadily increased.

[0032] In some embodiments, the solar water collection tank 12 is connected to a first discharge pipe 28 and a second discharge pipe 29; a heat exchange pipe 30 is arranged in the center of the constant temperature water tank 17, and the heat exchange pipe 30 is arranged in the constant temperature water tank 17 in a circuitous manner to increase the heat exchange area. The first discharge pipe 28 is connected to one end of the heat exchange pipe 30; the other end of the heat exchange pipe 30 is connected to a discharge intermediate pipe 31, and the discharge intermediate pipe 31 is connected to the second discharge pipe 29. Discharge control valves 32 are respectively installed on the first discharge pipe 28 and the second discharge pipe 29; generally speaking, the water temperature in the solar water collection tank 12 is higher than the water temperature in the constant temperature water tank 17. In order to reduce the use of the electric heater, the high-temperature water in the solar water collection tank 12 is led through the constant temperature water tank 17 to exchange heat with the water in the constant temperature water tank 17. If the water in the constant humidity water tank still does not reach the set temperature after heat exchange, the electric heater is started.

[0033] The intermediate discharge pipe 31 and the second discharge pipe 29 are connected to a main discharge pipe 33. A mixer 34 is installed on the main discharge pipe 33, which is connected to a cold water pipe 35. The main discharge pipe is connected to the hot water user end. When the water in the constant temperature water tank 17 does not need to undergo heat exchange with the water in the solar water collection tank 12, the water in the solar water collection tank 12 directly enters the mixer 34 through the second discharge pipe 29, mixes with the low-temperature water in the cold water pipe 35, and is supplied to the hot water user end. When the water in the constant temperature water tank 17 needs to undergo heat exchange with the water in the solar water collection tank 12, the water in the solar water collection tank 12 passes through the first discharge pipe 28, passes through the constant temperature water tank 17, and then enters the mixer 34, where it mixes with the low-temperature water in the cold water pipe 35 and is supplied to the hot water user end. A flow control valve can be installed on the cold water pipe 35 to control the flow of low-temperature water from the cold water pipe 35 into the mixer 34, thereby adjusting the water temperature at the mixer 34 for use by the hot water user end.

[0034] In some implementations, the primary outlet of the heat exchanger 26 is connected to a bypass pipe 36, which is in communication with the intermediate discharge pipe 31. A flow control valve 37 is installed at the primary inlet and outlet of the heat exchanger 26, respectively. The flow control valve 37 on the primary outlet of the heat exchanger 26 is located between the thermostatic water tank 17 and the bypass pipe 36. When there is continuous lack of sunlight or poor lighting conditions, the water temperature in the solar thermal collector tube 10 does not reach the temperature required for discharge into the solar water collection tank 12, and the water in the solar water collection tank 12 is insufficient for hot water users. Water from the thermostatic water tank 17 can be drawn into the mixer 34 and mixed with the low-temperature water in the cold water pipe 35 to ensure hot water availability at the hot water users.

[0035] In some implementations, a water supply pipe 38 is also included. The water supply pipe 38 is connected to the municipal tap water. The water supply pipe 38 is connected to the cold water pipe 35, the constant temperature water tank 17, and the water supply end of the solar heat collection pipe 10, and valves are installed on the respective connected pipes for control, so that water can be supplied and replenished to the cold water pipe 35, the constant temperature water tank 17, and the solar heat collection pipe 10 in a timely manner.

[0036] In some implementations, the energy supply inlet of the first water source heat pump unit 15 is installed with a first energy supply control valve 39, the energy supply inlet of the second water source heat pump unit 16 is installed with a second energy supply control valve 40, the energy supply outlet of the first water source heat pump unit 15 is installed with a third energy supply control valve 41, and the energy supply outlet of the second water source heat pump unit 16 is installed with a fourth energy supply control valve 42. An energy supply connecting pipe 43 is connected between the energy supply outlet of the first water source heat pump unit 15 and the energy supply inlet of the second water source heat pump unit 16, and an energy supply connecting control valve 44 is installed on the energy supply connecting pipe 43. By opening the first energy supply control valve 39, the second energy supply control valve 40, the third energy supply control valve 41, and the fourth energy supply control valve 42, the energy supply side of the first water source heat pump unit 15 and the energy supply side of the second water source heat pump unit 16 can be operated respectively. By opening the first energy supply control valve 39, the energy supply connection control valve 44, and the fourth energy supply control valve 42, and closing the second energy supply control valve 40 and the third energy supply control valve 41, the series connection mode of the energy supply side of the first water source heat pump unit 15 and the energy supply side of the second water source heat pump unit 16 is realized, corresponding to the series operation mode of the water source side of the first water source heat pump unit 15 and the water source side of the second water source heat pump unit 16.

[0037] In some implementations, a water intake tank 45 is also included. The water for the water intake tank 45 can come from groundwater or surface water. The water intake tank 45 is connected in parallel with the water inlet end of the first water source heat pump unit 15 and the water inlet end of the second water source heat pump unit 16. Temperature sensors 46 are respectively provided in the water intake tank 45, the constant temperature water tank 17, and the solar water collection tank 12 to monitor the water temperature in real time.

[0038] In some implementations, the photovoltaic controller 13 is connected to an energy storage backup battery pack 47 to provide a guaranteed power supply for the operation of the electric heater.

[0039] It should be noted that a water pump is installed on the corresponding flow pipe as needed to provide power for water flow; and the above-mentioned control valve can be selected as an electric valve or a manual valve according to actual needs.

[0040] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A photovoltaic energy storage and supply system, comprising a plurality of solar heat collecting tubes, a plurality of solar photovoltaic panels, a solar water collection tank, a photovoltaic controller, a plurality of energy storage battery packs, a first water source heat pump unit, a second water source heat pump unit, and a constant temperature water tank, wherein the plurality of solar heat collecting tubes are connected to the solar water collection tank, the plurality of solar photovoltaic panels are electrically connected to the photovoltaic controller, and the photovoltaic controller is electrically connected to the plurality of energy storage battery packs, characterized in that: An electric heater is provided in the constant temperature water tank, and the electric heater is arranged in a ring along the constant temperature water tank. The photovoltaic controller is electrically connected to the heating controller, and the heating controller is electrically connected to the electric heater; The photovoltaic controller is connected to the power grid, a first switch is provided between the power grid and the heating controller, and a second switch is provided between the photovoltaic controller and the heating controller; The water source inlet end of the first water source heat pump unit and the water source inlet end of the second water source heat pump unit are respectively installed with a water inlet control valve, the water source outlet end of the first water source heat pump unit and the water source outlet end of the second water source heat pump unit are respectively installed with a water outlet control valve, and an intermediate pipe is connected between the water source outlet end of the first water source heat pump unit and the water source inlet end of the second water source heat pump unit, and an intermediate control valve is installed on the intermediate pipe; A heat exchanger is provided between the intermediate pipe and the constant temperature water tank. The primary side of the heat exchanger is connected to the constant temperature water tank, the secondary side of the heat exchanger is connected in parallel with both ends of the intermediate pipe, and the intermediate control valve is located in the middle of the intermediate pipe.

2. The photovoltaic energy storage and supply system according to claim 1, characterized in that: The solar water collecting tank is connected to a first discharge pipe and a second discharge pipe; A heat exchange pipe is arranged in the center of the constant temperature water tank, and a first discharge pipe is connected to one end of the heat exchange pipe; the other end of the heat exchange pipe is connected to a discharge intermediate pipe, and the discharge intermediate pipe is connected to the second discharge pipe. Discharge control valves are respectively installed on the first discharge pipe and the second discharge pipe. The discharge intermediate pipe and the second discharge pipe are connected to a discharge main pipe, a mixer is installed on the discharge main pipe, the mixer is connected to a cold water pipe, and the discharge main pipe is connected to the hot water user end.

3. The photovoltaic energy storage and supply system according to claim 1, characterized in that: The primary side outlet end of the heat exchanger is connected to a bypass pipe, which is connected to the discharge intermediate pipe. Flow control valves are respectively installed at the primary side inlet and outlet ends of the heat exchanger. The flow control valve on the primary side outlet end of the heat exchanger is located between the constant temperature water tank and the bypass pipe.

4. The photovoltaic energy storage and supply system according to claim 1, characterized in that: It also includes a water supply pipe, which is connected to the cold water pipe, the constant temperature water tank, and the water supply end of the solar heat collecting pipe respectively.

5. The photovoltaic energy storage and supply system according to claim 1, characterized in that: Energy supply control valves are respectively installed at the energy supply inlet of the first water source heat pump unit, the energy supply inlet of the second water source heat pump unit, the energy supply outlet of the first water source heat pump unit and the energy supply outlet of the second water source heat pump unit. An energy supply connecting pipe is connected between the energy supply outlet of the first water source heat pump unit and the energy supply inlet of the second water source heat pump unit, and an energy supply connecting control valve is installed on the energy supply connecting pipe.

6. The photovoltaic energy storage and supply system according to claim 1, characterized in that: It also includes a water intake tank, which is connected in parallel with the water inlet end of the first water source heat pump unit and the water inlet end of the second water source heat pump unit; temperature sensors are respectively provided in the water intake tank, the constant temperature water tank and the solar water collection tank.

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