Solar photovoltaic photo-thermal and air energy hot water preparation system

Abstract

The invention belongs to the technical field of solar energy utilization and building energy saving, and provides a solar photovoltaic photo-thermal and air energy hot water preparation system. Comprising a PV / T assembly, a photovoltaic inverter, a solar hot water circulating pump, a heating water tank, a constant-temperature water tank, an air energy circulating pump, an air energy hot water unit, a domestic hot water supply and circulating pump, an expansion tank, an electric water replenishing valve and an electric two-way valve. Dual combination of photovoltaic power generation and photo-thermal utilization is achieved through the PV / T assembly, under the same roof area, the energy utilization efficiency is greatly improved, meanwhile, the temperature of the photovoltaic panel is reduced to improve the power generation efficiency, the system is combined with the air energy unit for supplementary heating, and through time-phased water supplementing and temperature linkage control, the energy consumption of the air energy unit is reduced; the domestic hot water supply and circulating pump adopts frequency conversion control and is combined with return water temperature regulation, so that the circulating energy consumption is reduced while stable water supply is guaranteed, and the problems of insufficient solar energy utilization, high energy consumption, unstable supply and the like in the prior art are integrally solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar energy utilization and building energy conservation, and specifically relates to a solar photovoltaic thermal and air energy hot water preparation system. Background Art

[0002] Solar photovoltaic / thermal (PV / T) technology combines photovoltaic power generation and solar thermal energy to achieve a higher solar energy utilization rate. In response to the national call for energy conservation and emission reduction, photovoltaic power generation or solar water heating systems are usually installed on building roofs.

[0003] However, due to the limited roof area of ​​many buildings, the installation area of ​​photovoltaic panels or solar water heating systems is relatively small, and their actual energy saving rate is often difficult to meet the requirements of low-energy buildings. A separate photovoltaic power generation or hot water system is difficult to take into account both energy efficiency and space requirements. The increase in the operating temperature of the photovoltaic panels will significantly reduce the power generation efficiency. The traditional PV / T system has poor synergy between heat utilization and hot water preparation, and does not constitute an efficient energy closed-loop system. In addition, a single hot water system (such as air energy or solar energy) has problems such as insufficient heat utilization, extensive water replenishment and water supply control, high energy consumption, and insufficient stability of water supply temperature and pressure.

[0004] Therefore, those skilled in the art have proposed a solar photovoltaic thermal and air energy hot water preparation system to solve the problems raised in the background technology.

[0005] The above information disclosed in this background technology is only for enhancing understanding of the background technology of the present invention and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a solar photovoltaic thermal and air-energy hot water preparation system to solve the problem in the prior art that due to the limited roof area of ​​many buildings, the photovoltaic panels or solar water heating systems are laid in a small area, and their actual energy saving rate is often difficult to meet the requirements of low-energy buildings.

[0007] To achieve the above objectives, the present invention provides a solar photovoltaic thermal and air-energy hot water preparation system, comprising a PV / T module, a photovoltaic inverter, a solar hot water circulation pump, a heating water tank, a constant temperature water tank, an air-energy circulation pump, an air-energy hot water unit, a domestic hot water supply and circulation pump, an expansion tank, an electric water supply valve, and an electric two-way valve;

[0008] The PV / T assembly is connected to the heating water tank through a pipeline, and the solar hot water circulation pump is arranged on the pipeline between the PV / T assembly and the heating water tank;

[0009] The heating water tank is connected to the constant temperature water tank through a pipeline;

[0010] The constant temperature water tank is connected with the air energy hot water unit, the hot water supply pipeline and the hot water return pipeline through pipelines.

[0011] The hot water supply and circulating pump is arranged on the pipeline between the constant temperature water tank and the hot water supply pipeline.

[0012] The constant temperature water tank is connected with a water supplement pipeline, and the electric water supplement valve is arranged on the water supplement pipeline.

[0013] The input end of the photovoltaic inverter is electrically connected with the PV / T assembly, and the output end is connected with the power grid.

[0014] The expansion tank is connected with the pipeline of the system.

[0015] Preferably, the PV / T assembly comprises a photovoltaic power generation module and a heat exchange plate, the heat exchange plate is combined with the photovoltaic power generation module, the heat exchange plate is provided with a channel for flowing a heat conducting medium, and the heat conducting medium is a glycol solution.

[0016] Preferably, the photovoltaic power generation module of the PV / T assembly comprises a protective back plate, a thermal insulation material, a TPT plate, an EVA adhesive film, a silicon cell and a glass plate, the silicon cell is bonded with the glass plate and the TPT plate through the EVA adhesive film, the side of the TPT plate away from the EVA adhesive film is attached to the heat exchange plate, the side of the heat exchange plate away from the TPT plate is attached to the thermal insulation material, and the side of the thermal insulation material away from the heat exchange plate is attached to the protective back plate.

[0017] Preferably, the constant temperature water tank is an open water tank, the constant temperature water tank is provided with an electronic liquid level meter, a floating ball water taking head and a water taking hose, the floating ball water taking head always floats on the top layer of water to take high-temperature water in the upper part of the constant temperature water tank, one end of the water taking hose is connected with the floating ball water taking head, and the other end is connected with the input end of the hot water supply and circulating pump.

[0018] Preferably, the heating water tank is a pressure-bearing water tank, the heating water tank is provided with a coil pipe, and the two ends of the coil pipe are connected with the PV / T assembly through pipelines.

[0019] Preferably, the hot water supply and circulating pump is a variable frequency pump, and the hot water supply and circulating pump is also connected with the hot water return pipeline.

[0020] Preferably, the air energy hot water unit forms a circulating loop with the constant temperature water tank through pipelines, and the air energy circulating pump is connected in series in the circulating loop.

[0021] Preferably, the electrically-driven water replenishing valve is arranged on a water replenishing pipe connecting the tap water supply and the constant temperature water tank, and the electrically-driven two-way valve is connected in series on the domestic hot water return pipe.

[0022] Preferably, the expansion tank is connected into the pipe between the PV / T assembly and the heating water tank through a branch pipe.

[0023] Preferably, the PV / T assembly, the solar water circulating pump and the coil of the heating water tank are connected in series through the pipe to form a closed loop.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application realizes the combination of photovoltaic power generation and photothermal utilization through the PV / T assembly, greatly improves the energy utilization efficiency under the same roof area, reduces the temperature of the photovoltaic panel to improve the power generation efficiency, combines the air energy unit for supplementary heating, reduces the energy consumption of the air energy unit through time period water replenishing and temperature linkage control, adopts frequency conversion control for the domestic hot water supply and circulating pump, adjusts the return water temperature to ensure the stable water supply while reducing the circulating energy consumption, and solves the problems of insufficient solar energy utilization, high energy consumption and unstable supply in the prior art.

[0026] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features will be readily apparent to those skilled in the art by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Fig. 1 is a schematic diagram of the working principle of a solar photovoltaic and photothermal water preparation system according to an embodiment of the present application;

[0028] Figure 2 Fig. 2 is a schematic diagram of the structure of a PV / T assembly of a solar photovoltaic and photothermal water preparation system according to an embodiment of the present application.

[0029] In the figure: 1, PV / T assembly; 101, protective back plate; 102, thermal insulation material; 103, heat exchange plate; 104, TPT plate; 105, EVA adhesive film; 106, silicon cell piece; 107, glass plate; 2, photovoltaic inverter; 3, solar water circulating pump; 4, heating water tank; 401, coil; 5, constant temperature water tank; 501, electronic liquid level meter; 502, floating ball water taking head; 503, water taking hose; 6, air energy circulating pump; 7, air energy water heater unit; 8, domestic hot water supply and circulating pump; 9, expansion tank; 10, electrically-driven water replenishing valve; 11, electrically-driven two-way valve. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying 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 some embodiments of the present invention, not all embodiments. It should be noted that the drawings are schematic and not to scale. For the sake of clarity and convenience in the drawings, the relative sizes and proportions of the parts shown in the drawings are exaggerated or reduced in size, and any sizes are only illustrative and not restrictive.

[0031] Example:

[0032] See also Figure 1 - Figure 2As shown, a solar photovoltaic light heat and air energy hot water preparation system includes a PV / T assembly 1, a photovoltaic inverter 2, a solar hot water circulating pump 3, a heating water tank 4, a constant temperature water tank 5, an air energy circulating pump 6, an air energy hot water unit 7, a domestic hot water supply and circulating pump 8, an expansion tank 9, an electric water replenishment valve 10, and an electric two-way valve 11. The PV / T assembly 1 integrates photovoltaic power generation and light heat collection functions, and simultaneously realizes dual utilization of solar energy in the form of electric energy and heat energy. The photovoltaic inverter 2 is electrically connected to the silicon cell 106 of the PV / T assembly 1, and functions to convert direct current generated by the silicon cell 106 into alternating current that meets grid standards, so as to realize grid connection of electric energy or direct supply to electrical equipment (such as circulating pumps and control modules) in the system. The solar hot water circulating pump 3 is connected in series in a pipeline between the heat exchange plate 103 of the PV / T assembly 1 and the coil 401 of the heating water tank 4, and functions to drive circulation of a heat conducting medium between the heat exchange plate 103 and the coil 401, so as to transfer heat collected by the heat exchange plate 103 to the heating water tank 4. The heating water tank 4 is a pressure-bearing type water tank, and functions to temporarily store and receive heat from the PV / T assembly 1, and to exchange heat with water in the tank through the internal coil 401, so as to transfer heat to the water to preheat or heat domestic hot water. The constant temperature water tank 5 is an open type water tank, and functions to store domestic hot water that has been preheated by the heating water tank 4 or heated by the air energy unit, and to serve as a buffer unit for hot water supply, so as to stabilize water supply temperature. The air energy circulating pump 6 is connected in series in a pipeline between the constant temperature water tank 5 and the air energy hot water unit 7, and functions to drive circulation of water in the constant temperature water tank 5 between the unit and the water tank, so as to cause the water to absorb heat and increase in temperature by the air energy unit. The air energy hot water unit 7 is connected to the constant temperature water tank 5 through a pipeline, and functions to heat water by absorbing low-level heat energy in the air when heat provided by the PV / T assembly 1 is insufficient (water temperature in the constant temperature water tank 5 does not reach a set value), so as to make up a heat gap. The domestic hot water supply and circulating pump 8 is a variable frequency pump, one end of which is connected to the constant temperature water tank 5 through a water taking hose 503, and the other end of which is connected to a domestic hot water supply pipeline and a return pipeline, and functions to deliver hot water in the constant temperature water tank 5 to a user end (supply function), and simultaneously to drive unused hot water to flow back to the constant temperature water tank 5 (circulation function), so as to avoid accumulation of cold water in the pipeline. The expansion tank 9 is connected to a heat conducting medium pipeline between the PV / T assembly 1 and the heating water tank 4 through a branch pipe, and functions to absorb volume expansion of the heat conducting medium due to temperature rise, so as to stabilize system pressure and avoid damage to the pipeline due to excessive pressure. The electric water replenishment valve 10 is installed on a water replenishment pipeline connecting a tap water supply and the constant temperature water tank 5, and functions to automatically open and close according to a signal of an electronic liquid level meter 501, so as to replenish cold water to the constant temperature water tank 5 (open when water level is lower than a set value, and close when the set value is reached). The electric two-way valve 11 is connected in series in a domestic hot water return pipeline, and functions to automatically open and close according to a return water temperature (open when the return water temperature is too low to allow cold water to flow back to be reheated, and close when the temperature reaches a standard), so as to reduce invalid circulation energy consumption.

[0033] The PV / T assembly 1 is connected with the heating water tank 4 through a pipeline, and the solar hot water circulating pump 3 is arranged on the pipeline between the PV / T assembly 1 and the heating water tank 4. After the PV / T assembly 1 absorbs solar energy, the generated heat energy is transmitted through the internal heat exchange medium. The pipeline provides a channel for the medium flow, so that the heat energy is transmitted from the PV / T assembly 1 to the heating water tank 4. The solar hot water circulating pump 3 provides power for the medium circulation and controls the flow of the medium between the two, so as to realize effective heat transfer.

[0034] The heating water tank 4 is connected with the constant temperature water tank 5 through a pipeline. The heated water in the heating water tank 4 is transported to the constant temperature water tank 5 through the pipeline, so that the constant temperature water tank 5 can store hot water and provide a water source for subsequent life hot water supply, realizing the transfer and storage of hot water.

[0035] The constant temperature water tank 5 is connected with the air energy hot water unit 7, the life hot water supply pipeline and the life hot water return pipeline through pipelines respectively. The air energy circulating pump 6 is arranged on the pipeline between the constant temperature water tank 5 and the air energy hot water unit 7. The pipeline connected with the air energy hot water unit 7 is used to make the water flow into the unit for heating and then return when the water temperature in the constant temperature water tank 5 is insufficient. The pipeline connected with the life hot water supply pipeline realizes the supply of hot water to the user end, and the pipeline connected with the return pipeline makes the unused cold water return to be reheated. The air energy circulating pump 6 drives the water to circulate between the constant temperature water tank 5 and the air energy hot water unit 7, so as to ensure the heating process.

[0036] The life hot water supply and circulating pump 8 is arranged on the pipeline between the constant temperature water tank 5 and the life hot water supply pipeline. The pump is responsible for pressurizing and transporting the hot water in the constant temperature water tank 5 to the life hot water supply pipeline to meet the user's water pressure demand, and can also drive the water in the return pipeline to return when needed, so as to ensure the circulation and update of the hot water in the pipeline.

[0037] The constant temperature water tank 5 is connected with a water supplement pipeline, and the electric water supplement valve 10 is arranged on the water supplement pipeline. The water supplement pipeline is used to supplement tap water to the constant temperature water tank 5 to maintain the water level in the water tank. The electric water supplement valve 10 controls the opening and closing of the water supplement pipeline and automatically opens or closes according to the water level in the water tank, so as to ensure that the water tank has sufficient water.

[0038] The input end of the photovoltaic inverter 2 is electrically connected with the PV / T assembly 1, and the output end is connected with the power grid. The photovoltaic power generation module in the PV / T assembly 1 generates direct current. The photovoltaic inverter 2 converts the direct current into alternating current meeting the standard of the power grid. The converted electric energy is connected with the power grid through the output end, so as to realize the utilization or transmission of electric energy.

[0039] The expansion tank 9 is connected with the pipeline of the system. The medium (such as water or heat conducting liquid) in the system will expand when heated. The expansion tank 9 can absorb the pressure generated by the expansion of the medium, so as to avoid damage to the equipment caused by excessive pressure in the pipeline and play a role in stabilizing the pressure of the system.

[0040] Specifically, the PV / T assembly 1 includes a photovoltaic module and a heat exchange plate 103. The heat exchange plate 103 is combined with the photovoltaic module. The heat exchange plate 103 is of a plate structure made of metal (such as aluminum or copper) and has a closed channel (for flowing a heat conducting medium such as glycol solution) inside. The heat exchange plate 103 absorbs the waste heat generated by the silicon cell 106 during operation and part of the light energy that passes through the cell, reduces the temperature of the silicon cell 106 (to avoid reducing the power generation efficiency due to high temperature), and transmits the heat to the heat conducting medium.

[0041] Further, the photovoltaic module of the PV / T assembly 1 includes a protective back plate 101, a thermal insulation material 102, a TPT plate 104, an EVA adhesive film 105, a silicon cell 106, and a glass plate 107. The silicon cell 106 is bonded to the glass plate 107 and the TPT plate 104 through the EVA adhesive film 105. The side of the TPT plate 104 away from the EVA adhesive film 105 is attached to the heat exchange plate 103. The side of the heat exchange plate 103 away from the TPT plate 104 is attached to the thermal insulation material 102. The side of the thermal insulation material 102 away from the heat exchange plate 103 is attached to the protective back plate 101. The protective back plate 101 is made of a weather-resistant material (such as fluoroplastic composite film). The protective back plate 101 prevents water vapor, dust, and mechanical impact from the outside, protects the internal structure (such as the thermal insulation material 102 and the heat exchange plate 103) from environmental erosion, and prolongs the service life of the assembly. The thermal insulation material 102 is made of a material with excellent thermal insulation performance (such as polyurethane foam material). The thermal insulation material 102 reduces the loss of heat collected by the heat exchange plate 103 to the outside, improves the heat utilization efficiency, and avoids the problem of condensation caused by too low temperature on the back of the assembly. The TPT plate 104 is a polyvinyl fluoride composite film. The TPT plate 104 realizes electrical insulation (to prevent conduction between the heat exchange plate 103 and the silicon cell 106), blocks water vapor from entering the area of the silicon cell 106, and protects the cell from corrosion. The EVA adhesive film 105 is an ethylene-vinyl acetate copolymer adhesive film. After high-temperature curing, the EVA adhesive film 105 forms a bonding layer. The EVA adhesive film 105 tightly bonds adjacent structures (the glass plate 107, the silicon cell 106, and the TPT plate 104) into a whole, realizes sealing (to prevent water vapor from entering), and allows light to pass through (to ensure that light reaches the silicon cell 106). The silicon cell 106 is the core component of photovoltaic power generation. The silicon cell 106 absorbs sunlight that passes through the glass plate 107, converts the light energy into direct current through the photovoltaic effect, and protects the internal structure (such as the silicon cell 106) from mechanical impact and environmental damage, and allows sunlight to pass through and shine on the silicon cell 106.

[0042] Further, the constant temperature water tank 5 is an open water tank, and the constant temperature water tank 5 is provided with an electronic liquid level meter 501, a floating ball water taking head 502 and a water taking hose 503. One end of the water taking hose 503 is connected with the floating ball water taking head 502, and the other end is connected with an input end of the domestic hot water supply and circulating pump 8. The electronic liquid level meter 501 is installed in the constant temperature water tank 5, and functions to monitor the water level in the water tank in real time, and provide a signal for opening and closing of the electric water supplement valve 10 (trigger water supplement when the water level is lower than the set value). The floating ball water taking head 502 floats on the water surface in the constant temperature water tank 5, and functions to always take hot water with the highest temperature from the upper part of the water tank (because hot water has small density and gathers in the upper part of the water tank), so as to ensure that the hot water supplied to the user end has stable temperature. The water taking hose 503 has one end connected with the floating ball water taking head 502, and the other end connected with the input end of the domestic hot water supply and circulating pump 8, and functions to adapt the floating action of the floating ball water taking head 502, and stably deliver the hot water taken by the floating ball water taking head 502 to the water supply pump.

[0043] Further, the heating water tank 4 is a pressure-bearing water tank, and the heating water tank 4 is provided with a coil pipe 401. The two ends of the coil pipe 401 are connected with the PV / T assembly 1 through pipelines. The coil pipe 401 serves as a heat conducting medium and a heat exchange carrier of the water body in the heating water tank 4, and transmits the heat of the heat conducting medium to the water body through the pipe wall.

[0044] Further, the domestic hot water supply and circulating pump 8 is a variable frequency pump, and is further connected with a domestic hot water return pipeline. The domestic hot water supply and circulating pump 8 can drive the cold water in the return pipeline to flow back to the constant temperature water tank 5 for re-heating, so as to realize the functions of hot water supply and return circulation, and avoid accumulation of cold water in the pipeline.

[0045] Further, the air energy water heater 7 forms a circulation loop with the constant temperature water tank 5 through pipelines, and the air energy circulating pump 6 is connected in series in the circulation loop, so as to provide power for water circulation, and ensure that the water in the constant temperature water tank 5 can continuously exchange heat with the air energy assembly, and the hot water temperature is stable.

[0046] Further, the electric water supplement valve 10 is arranged on a water supplement pipeline connecting the tap water supply and the constant temperature water tank 5, and can be automatically opened and closed according to the water level monitored by the electronic liquid level meter 501 in the constant temperature water tank 5 and the time period water supplement logic, so as to realize accurate water supplement to the constant temperature water tank 5, and maintain stable water level. The electric two-way valve 11 is connected in series on the domestic hot water return pipeline, and the two ends of the domestic hot water return pipeline are connected with the end of the domestic hot water supply pipeline and the constant temperature water tank 5, so as to form a closed loop of "water supply pipeline-user end-return pipeline-constant temperature water tank 5".

[0047] Furthermore, the expansion tank 9 is connected to the pipeline between the PV / T component 1 and the heating water tank 4 through a branch pipe. Since the heat-conducting medium will expand when heated, the expansion tank 9 can absorb its volume expansion, avoiding a sudden increase in pressure in the pipeline that may cause damage to the pipeline, valves or equipment, and plays a role in stabilizing the system pressure, ensuring the safety of the heat-conducting medium circulation between the PV / T component 1 and the heating water tank 4.

[0048] Furthermore, the PV / T component 1, the solar hot water circulation pump 3, and the coil 401 of the heating water tank 4 are connected in sequence through pipelines to form a closed loop. The closed loop is a circulation path for the heat-conducting medium (such as ethylene glycol solution), which realizes the efficient transfer of heat collected by the PV / T component 1 to the heating water tank 4, while reducing the temperature of the photovoltaic panel to improve the power generation efficiency.

[0049] System operation logic:

[0050] Temperature T1 of the thermal fluid of PV / T component 1;

[0051] Heating water temperature T2 in water tank 4;

[0052] The water temperature in the constant temperature water tank 5 is T3;

[0053] The liquid level L1 in the constant temperature water tank 5;

[0054] Domestic hot water return water temperature T4;

[0055] Domestic hot water supply pressure P1.

[0056] Working principle:

[0057] Photovoltaic thermal energy collection and transmission:

[0058] The silicon cell 106 in the PV / T assembly 1 absorbs solar energy and converts it into direct current (DC). This DC is converted into AC by the photovoltaic inverter 2 and then connected to the grid. At the same time, the heat exchange plate 103 of the PV / T assembly 1 absorbs the waste heat and part of the solar energy generated by the silicon cell 106 during operation. The heat-conducting medium (such as ethylene glycol solution) flowing in its internal channel carries and transfers this heat. When the difference between the temperature T1 of the heat-conducting medium in the heat exchange plate 103 and the water temperature T2 in the heating water tank 4 is ≥8°C (adjustable), the solar hot water circulation pump 3 starts, driving the heat-conducting medium to circulate between the PV / T assembly 1 and the coil 401 of the heating water tank 4. The heat is transferred to the water in the heating water tank 4 through the wall of the coil 401, completing the initial heating of the water. When T1-T2≤2°C (adjustable), the solar hot water circulation pump 3 stops running.

[0059] Hot water storage and secondary heating:

[0060] The water preliminarily preheated in the heating tank 4 flows into the constant-temperature water tank 5 (open water tank) through a pipeline for storage, and an electronic liquid level meter 501 in the constant-temperature water tank 5 monitors the water level L1 in real time. When the water temperature T3 in the constant-temperature water tank 5 is less than or equal to 50 DEG C (adjustable), an air energy circulating pump 6 is started to drive the water to circulate between the constant-temperature water tank 5 and an air energy water heater set 7, and the water is heated to a temperature T3 greater than or equal to 55 DEG C (adjustable) through the air energy water heater set 7. Then, the air energy circulating pump 6 and the air energy water heater set 7 are turned off. At the same time, an electric water supplement valve 10 supplements water from a water supply to the constant-temperature water tank 5 according to the water level L1 monitored by the electronic liquid level meter 501 and a set time-division water supplement logic (00:00-8:30, 8:30-16:00, 16:00-24:00 correspond to different water levels and temperature conditions respectively), so as to maintain the water level in the tank stable. When the water level L1 is lower than a minimum water level and the water temperature T3 is less than or equal to 42 DEG C, or the water level L1 is higher than an alarm water level, the system triggers an alarm.

[0061] 00:00-8:30 (time adjustable) The maximum water level L1 in the constant-temperature water tank 5 is set at 1 / 2 of the total effective water volume (the value is adjustable). When the water level L1 is lower than the maximum water level, the electric water supplement valve 10 is opened to supplement water to the maximum water level or the water temperature T3 is less than or equal to 42 DEG C.

[0062] 8:30-16:00 (time adjustable) The maximum water level L1 in the constant-temperature water tank 5 is set at a full water level. When the water temperature T2 in the heating tank 4 is greater than or equal to 50 DEG C (the value is adjustable), the electric water supplement valve 10 is opened to supplement water to the constant-temperature water tank 5 to the water temperature T2 in the heating tank 4 being less than or equal to 45 DEG C (the value is adjustable) or the water level L1 being the maximum water level.

[0063] 16:00-24:00 (time adjustable) The maximum water level L1 in the constant-temperature water tank 5 is set at a full water level. When the water level L1 is lower than the maximum water level, the electric water supplement valve 10 is opened to supplement water to the maximum water level or the water temperature T3 is less than or equal to 42 DEG C. When the water level L1 reaches the maximum set value in the current period or the water temperature T3 is less than or equal to 42 DEG C, the electric water supplement valve 10 is immediately closed.

[0064] Domestic hot water supply and circulation:

[0065] The domestic hot water supply and circulating pump 8 (variable frequency control) takes the upper high-temperature hot water from the constant-temperature water tank 5 through a floating ball water taking head 502 and a water taking hose 503, pressurizes and delivers the hot water to a domestic hot water supply pipeline to meet the user's demand. When the domestic hot water supply pressure P1 is less than or equal to 0.1 MPa (adjustable), the pump is started and the pressure is maintained through variable frequency adjustment. When the pressure P1 is greater than or equal to 0.2 MPa (adjustable), the pump is turned off. In addition, when the water temperature T4 in the domestic hot water return pipeline is less than or equal to 40 DEG C (adjustable), the electric two-way valve 11 is opened, and the domestic hot water supply and circulating pump 8 drives the cold water in the pipeline to flow back to the constant-temperature water tank 5 for reheating. When the water temperature T4 is greater than or equal to 50 DEG C (adjustable), the electric two-way valve 11 is closed to ensure that the temperature of the hot water in the pipeline is stable.

[0066] System pressure is stable:

[0067] The expansion tank 9 is connected to the pipeline between the PV / T assembly 1 and the hot water tank 4 through a branch pipe, which is used to absorb the volume expansion of the heat conducting medium due to temperature change, avoid the damage of equipment caused by the over-high system pressure, and ensure the stable operation of the whole system.

[0068] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solar photovoltaic thermal and air energy hot water preparation system, characterized by: It includes a PV / T assembly (1), a photovoltaic inverter (2), a solar hot water circulation pump (3), a heating water tank (4), a constant temperature water tank (5), an air energy circulation pump (6), an air energy hot water unit (7), a domestic hot water supply and circulation pump (8), an expansion tank (9), an electric water supply valve (10) and an electric two-way valve (11); The PV / T assembly (1) is connected to a heating water tank (4) via a pipeline, and the solar hot water circulation pump (3) is arranged on the pipeline between the PV / T assembly (1) and the heating water tank (4); The heating water tank (4) is connected to the constant temperature water tank (5) via a pipeline; The constant temperature water tank (5) is connected to the air energy water heater (7), the domestic hot water supply pipe and the domestic hot water return pipe through pipelines, and the air energy circulation pump (6) is arranged on the pipeline between the constant temperature water tank (5) and the air energy water heater (7); The domestic hot water supply and circulation pump (8) is arranged on the pipeline between the constant temperature water tank (5) and the domestic hot water supply pipeline; The constant temperature water tank (5) is connected to a water supply pipe, and the electric water supply valve (10) is arranged on the water supply pipe; The input end of the photovoltaic inverter (2) is electrically connected to the PV / T component (1), and the output end is connected to the power grid; The expansion tank (9) is connected to the pipeline of the system.

2. A solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The PV / T assembly (1) comprises a photovoltaic power generation module and a heat exchange plate (103). The heat exchange plate (103) is combined with the photovoltaic power generation module. A channel for circulating a heat-conducting medium is provided in the heat exchange plate (103). The heat-conducting medium is an ethylene glycol solution.

3. The solar photovoltaic thermal and air energy hot water preparation system according to claim 2, characterized in that: The photovoltaic power generation module of the PV / T assembly (1) comprises a protective backsheet (101), a thermal insulation material (102), a TPT board (104), an EVA film (105), a silicon cell (106) and a glass board (107); the silicon cell (106) is respectively bonded to the glass board (107) and the TPT board (104) via the EVA film (105); the side of the TPT board (104) away from the EVA film (105) is bonded to the heat exchange plate (103); the side of the heat exchange plate (103) away from the TPT board (104) is bonded to the thermal insulation material (102); and the side of the thermal insulation material (102) away from the heat exchange plate (103) is bonded to the protective backsheet (101).

4. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The constant temperature water tank (5) is an open water tank. An electronic liquid level meter (501), a float water inlet head (502) and a water inlet hose (503) are provided in the constant temperature water tank (5). The float water inlet head (502) always floats on the top of the water surface to extract high-temperature water from the upper part of the constant temperature water tank. One end of the water inlet hose (503) is connected to the float water inlet head (502), and the other end is connected to the input end of the domestic hot water supply and circulation pump (8).

5. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The heating water tank (4) is a pressure-bearing water tank. A coil (401) is provided in the heating water tank (4). Both ends of the coil (401) are connected to the PV / T assembly (1) via pipelines.

6. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The domestic hot water supply and circulation pump (8) is a variable frequency pump, and the domestic hot water supply and circulation pump (8) is also connected to the domestic hot water return pipe.

7. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The air energy water heater unit (7) forms a circulation loop with the constant temperature water tank (5) through a pipeline, and the air energy circulation pump (6) is connected in series in the circulation loop.

8. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The electric water supply valve (10) is arranged on the water supply pipe connecting the tap water supply and the constant temperature water tank (5), and the electric two-way valve (11) is connected in series to the domestic hot water return pipe, and the two ends of the domestic hot water return pipe are respectively connected to the end of the domestic hot water supply pipe and the constant temperature water tank (5).

9. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The expansion tank (9) is connected to the pipeline between the PV / T assembly (1) and the heating water tank (4) through a branch pipe.

10. The solar photovoltaic thermal and air energy hot water preparation system according to claim 1, characterized in that: The PV / T assembly (1), the solar hot water circulation pump (3), and the coil (401) of the heating water tank (4) are connected in sequence through pipelines to form a closed loop.

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