Green building energy-saving roof solar module

Abstract

The utility model relates to the technical field of energy saving, specifically discloses a kind of green building energy-saving roof solar module, comprising: water storage tank;Further comprising: exchange pipe, exchange pipe is arranged inside the water storage tank, one end of exchange pipe is fixedly connected with first medium inlet pipe, one end of first medium inlet pipe is fixedly connected with electromagnetic three-way valve, the utility model is synergic regulation by electromagnetic three-way valve and circulating pump, realize the dynamic switching of " preferential heating→transitional regulation→preferential power generation", when water temperature of water storage tank is <40 DEG C, 100% heat medium flows to water storage tank, preferentially guarantee domestic hot water supply;When water temperature rises to 40-55 DEG C, heat medium flow proportion linear adjustment (80%→20%), synchronous promotion electric energy storage proportion (20%→80%); When water temperature >55 DEG C, 80% heat medium is cooled by bypass tank, focus photovoltaic power generation maximization, this logic completely solves the contradiction of traditional system " waste when heat surplus, rely on power grid when electricity shortage", solar comprehensive utilization rate is increased by more than 40%.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology, specifically to a green building energy-saving roof solar panel. Background Technology

[0002] In the field of green building energy conservation, the utilization of solar energy as a clean and renewable energy source has always been a research hotspot. Among them, solar domestic hot water supply and photovoltaic power generation technology have been widely used on building roofs. Traditional solar thermal systems only focus on heat energy conversion, using collectors to convert solar energy into heat energy to heat domestic water in hot water storage tanks. However, they cannot convert excess solar energy into electricity, resulting in a large amount of solar energy being wasted due to saturation of hot water demand when there is sufficient sunshine. While independent photovoltaic power generation systems can generate electricity, they cannot recover the waste heat generated when photovoltaic modules are working. This not only reduces the photovoltaic conversion efficiency (the efficiency decreases by about 0.3%-0.5% for every 1°C increase in photovoltaic cell temperature), but also requires additional roof space, increasing the building's load-bearing burden.

[0003] Existing systems that attempt to combine heat and electricity conversion generally lack dynamic adjustment mechanisms. When the water temperature in the hot water storage tank is below the applicable range, they cannot prioritize the supply of heat energy. When the water temperature meets the demand, they cannot automatically switch the energy distribution ratio to increase electricity output, resulting in a constant imbalance between heat and electricity supply and demand. For example, when the midday sun is strong, if there is enough hot water, the system continues to supply heat to the water tank, causing excess heat energy waste. At the same time, the photovoltaic module's efficiency drops sharply due to high-temperature power generation. In the evening, when water usage is at its peak, if there is insufficient sunlight, relying solely on the heat conversion function cannot meet the hot water demand, requiring frequent use of grid auxiliary heating, which greatly reduces the energy-saving effect. To address this, we propose a green building energy-saving rooftop solar module. Utility Model Content

[0004] The purpose of this invention is to provide a green building energy-saving roof solar panel to solve the problem mentioned in the background art that the system combining heat and electricity conversion generally lacks a dynamic adjustment mechanism.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a green building energy-saving roof solar panel, comprising: a water storage tank;

[0006] It also includes: an exchange pipe, which is installed inside the water storage tank. One end of the exchange pipe is fixedly connected to a first inlet pipe, and one end of the first inlet pipe is fixedly connected to an electromagnetic three-way valve. The input end of the electromagnetic three-way valve is fixedly connected to a circulation pump. One end of the circulation pump is equipped with a PVT plate, and the circulation pump is connected to the heat exchange tube inside the PVT plate. The heat exchange tube inside the PVT plate collects heat energy.

[0007] The second inlet pipe is fixedly connected to one side of the solenoid three-way valve. One end of the second inlet pipe is fixedly connected to a bypass box, which dissipates heat from the heat medium inside the second inlet pipe.

[0008] The other end of the heat exchange tube is fixedly connected to a first return tube, which is fixedly connected to one side of the PVT plate and connected to the heat exchange tube inside the PVT plate.

[0009] The bypass box is fixedly connected to one side of a second return pipe, which is fixedly connected to one side of the surface of the first return pipe.

[0010] The water storage tank is wrapped with insulation material such as polyurethane foam, and a slot adapted to the first return pipe is opened on one side of the water storage tank.

[0011] A battery is installed on one side of the internal solar cells of the PVT board, and the battery is located inside the bypass box.

[0012] The bypass box has a fixed partition plate inside, and the battery is located inside the bypass box away from the partition plate.

[0013] The water storage tank is equipped with a support frame at the bottom, which is fixedly connected to the bottom of the PVT board.

[0014] This utility model has at least the following beneficial effects:

[0015] This invention achieves dynamic switching between "priority heating → transitional adjustment → priority power generation" through the coordinated regulation of an electromagnetic three-way valve and a circulating pump. When the water temperature in the storage tank is <40℃, 100% of the heat transfer medium flows to the storage tank, prioritizing the supply of domestic hot water. When the water temperature rises to 40-55℃, the proportion of heat transfer medium flow is linearly adjusted (80%→20%), simultaneously increasing the proportion of electrical energy storage (20%→80%). When the water temperature is >55℃, 80% of the heat transfer medium dissipates heat through a bypass box, focusing on maximizing photovoltaic power generation. This logic completely solves the contradiction of traditional systems where "excess heat leads to waste, and insufficient electricity leads to reliance on the power grid," increasing the comprehensive utilization rate of solar energy by more than 40%. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the three-dimensional second-view structure of this utility model;

[0018] Figure 3 This is a rear sectional view of the structure of this utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the bypass box of this utility model.

[0020] In the diagram: 1. Water storage tank; 2. Exchange pipe; 3. First inlet pipe; 4. Solenoid three-way valve; 5. Circulation pump; 6. PVT plate; 7. Second inlet pipe; 8. Bypass box; 9. First return pipe; 10. Second return pipe; 12. Battery; 13. Divider plate; 14. Support frame. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Please see Figures 1 to 4 This utility model provides a technical solution: a green building energy-saving roof solar panel, comprising: a water storage tank 1;

[0024] It also includes: an exchange pipe 2, which is installed inside the water storage tank 1. One end of the exchange pipe 2 is fixedly connected to a first inlet pipe 3. One end of the first inlet pipe 3 is fixedly connected to an electromagnetic three-way valve 4. The input end of the electromagnetic three-way valve 4 is fixedly connected to a circulation pump 5. One end of the circulation pump 5 is equipped with a PVT plate 6. The circulation pump 5 is connected to the heat exchange tube inside the PVT plate 6. The heat exchange tube inside the PVT plate 6 collects heat energy.

[0025] The second inlet pipe 7 is fixedly connected to one side of the electromagnetic three-way valve 4. One end of the second inlet pipe 7 is fixedly connected to a bypass box 8, which dissipates heat from the heat medium inside the second inlet pipe 7.

[0026] As an integrated solar thermal and photovoltaic energy collection component, PVT plate 6 integrates heat exchange tubes and photovoltaic cells. The heat exchange tubes absorb heat energy from sunlight and can also adsorb heat from the photovoltaic cells, transferring the heat to the internal flowing heat medium to achieve solar thermal collection. At the same time, the photovoltaic cells convert solar energy into electrical energy. The current is regulated by the charge and discharge controller on one side to charge the battery 12 and store electrical energy, realizing the dual energy utilization of "solar thermal + photovoltaic" and maximizing the utilization rate of solar energy. When the circulation pump 5 is working, it extracts the heat medium that has absorbed heat in the heat exchange tubes of PVT plate 6 and pumps it into the subsequent pipeline system to ensure that the heat medium flows continuously in the entire circulation path, providing power support for heat energy transfer.

[0027] The electromagnetic three-way valve 4 acts as a "reversing switch" for the flow of the heat medium. Its input end is connected to the circulation pump 5, and its output end is connected to the first inlet pipe 3 and the second inlet pipe 7, respectively. When the water temperature in the water storage tank 1 does not reach the set value (heating is required), the electromagnetic three-way valve 4 switches to the first inlet pipe 3 path, guiding the heat medium to the exchange pipe 2 of the water storage tank 1. The exchange pipe 2 is coiled in the water storage tank 1 to increase the contact area with the water. When the heat medium flows through the exchange pipe 2, it transfers heat to the water in the water storage tank 1 through heat conduction, thus heating the water. The heated water can be directly used for domestic hot water in buildings, realizing the utilization of solar thermal energy. When the water temperature in the water storage tank 1 has reached the set value (no heating is required) or the heat medium temperature is too high (a cooling protection system is required), the electromagnetic three-way valve 4 switches to the second inlet pipe 7 path. The heat medium enters the bypass box 8 through the second inlet pipe 7. The core function of the bypass box 8 is to dissipate heat from the heat medium and prevent the heat medium from overheating and causing damage to the pipeline or equipment.

[0028] The other end of the heat exchange tube 2 is fixedly connected to the first return tube 9, which is fixedly connected to one side of the PVT plate 6 and is connected to the heat exchange tube inside the PVT plate 6.

[0029] A second return pipe 10 is fixedly connected to one side of the bypass box 8, and the second return pipe 10 is fixedly connected to one side of the surface of the first return pipe 9.

[0030] One end of the first return pipe 9 is connected to the other end of the exchange pipe 2, and the other end is fixedly connected to the heat exchange tube of the PVT plate 6. The heat medium that has released heat after flowing through the exchange pipe 2 returns to the PVT plate 6. One end of the second return pipe 10 is connected to the bypass box 8, and the other end is fixed to the surface of the first return pipe 9. The heat medium that has dissipated heat after flowing through the bypass box 8 flows into the first return pipe 9 and finally returns to the PVT plate 6. The dual return path ensures that no matter whether the heat medium flows to the exchange pipe 2 or the bypass box 8, it can return to the PVT plate 6 to absorb heat again, forming a complete cycle.

[0031] The outer layer of the water storage tank 1 is wrapped with insulation material such as polyurethane foam, and a slot adapted to the first return pipe 9 is opened on one side of the water storage tank 1.

[0032] As the core of the system for heat energy storage and heat exchange, the water storage tank 1 is mainly used to store water to be heated and realize the heat exchange between the heat medium and the water. The insulation material (such as polyurethane foam) wrapped around its outer layer can effectively reduce the loss of internal heat to the outside and improve the heat utilization efficiency. A slot adapted to the first return pipe 9 is opened on one side of the water storage tank 1 to ensure that the return pipe can pass through smoothly and connect to the PVT plate 6. At the same time, it provides a stable installation space for the internal exchange pipe 2. It is the "energy storage carrier" for the heat medium to exchange heat with the water.

[0033] A battery is located on one side of the internal battery cells of the PVT board, and the battery is located inside the bypass box.

[0034] The electrical energy generated by the photovoltaic cells of PVT board 6 is regulated and current-limited by the charge and discharge controller and then stored in battery 12. Battery 12 can store excess electrical energy to power auxiliary equipment (such as circulating pump 5 and solenoid three-way valve 4) at night or on rainy days, reducing dependence on the power grid and further improving energy-saving effect. The partition plate 13 in the bypass box 8 separates battery 12 from the heat dissipation area to avoid heat dissipation affecting the service life of battery 12, and battery 12 can also store household electricity.

[0035] A partition plate 13 is fixedly connected inside the bypass box 8, and the battery 12 is located inside the bypass box 8 away from the partition plate 13.

[0036] The internally fixed partition plate 13 can differentiate the spatial layout. At the same time, the space on one side of the partition plate 13 can be used to place the battery 12, realizing structural integration. The bypass box 8 dissipates the excess heat in the heat medium to the outside through air convection or built-in heat sink, so that the heat medium is cooled down and then flows back, ensuring the stable operation of the system under non-heating conditions and avoiding heat energy waste or equipment overheating risk.

[0037] Phased operation process

[0038] (a) Priority heating mode (water temperature < 40℃)

[0039] Parameter judgment: The controller monitors the water temperature in the middle of the water tank in real time. When the water temperature is below 40°C for 5 minutes, the priority heating logic is triggered.

[0040] Heating regulation: The electromagnetic three-way valve 4 automatically opens to full (100% opening), allowing the heat medium to enter the heat exchange tube inside the water storage tank 1 at full flow. The speed of the circulation pump 5 is increased to 3000r / min to maintain the maximum heat medium circulation flow. At the same time, the controller calculates the difference between the heat medium temperature at the outlet of the PVT plate 6 and the water temperature in the water storage tank 1 in real time. When the temperature difference is ≥8℃, circulation is maintained; when the temperature difference is <3℃, circulation is paused (to avoid ineffective energy consumption).

[0041] Power supply regulation: The electrical energy generated by the battery cells inside the PVT board 6 is given priority to the circulating pump 5, controller and other system self-use equipment. The remaining electrical energy is switched to the electric auxiliary heating rod through the relay (if the water temperature is <30℃, the heating rod is forced to start to accelerate the temperature rise). At this time, the battery 12 is not charged to ensure that all energy is used for heating.

[0042] Exit condition: When the water temperature in the middle of water tank 1 rises to 42℃ (including a 2℃ buffer zone) and remains stable for 3 minutes, it will automatically switch to the transition adjustment mode.

[0043] (ii) Transitional regulation mode (40℃≤water temperature≤55℃)

[0044] Dynamic parameter acquisition: The controller collects the water temperature of water tank 1, PVT board 6 temperature, battery SOC 12 and light intensity every 10 seconds as the basis for adjustment.

[0045] Heating ratio adjustment: The opening of the electromagnetic three-way valve 4 decreases linearly with the increase of water temperature (water temperature 40℃→80%, 45℃→60%, 50℃→40%, 55℃→20%), while the speed of the circulating pump 5 is simultaneously reduced (40℃→2500r / min, 55℃→1000r / min) to ensure that the heat medium flow rate matches the heating demand. The temperature difference between the heat medium outlet and the water in the storage tank 1 is controlled within 5℃±2℃ to maintain the efficient heat exchange range.

[0046] Power supply ratio adjustment: Photovoltaic power distribution gradually tilts towards energy storage. When the water temperature is 40℃, 20% of the power is charged into the storage battery and 80% is supplied to the system equipment. When the water temperature is 50℃, 50% is charged and 50% is supplied to the equipment. When the water temperature is 55℃, 80% is charged and 20% is supplied to the equipment. When the storage battery SOC is ≥90%, the excess power is automatically switched to the household load circuit (lighting, sockets, etc.).

[0047] Exit conditions: When the water temperature is ≥57℃ for 5 minutes (including a 2℃ buffer zone), switch to priority power generation mode. If the water temperature drops below 38℃ due to water usage, revert to priority heating mode.

[0048] (iii) Priority power generation mode (water temperature > 55℃)

[0049] Parameter lockout: When the water temperature in water tank 1 is ≥55℃ and the light intensity is ≥300W / ㎡, the system enters the power generation priority state.

[0050] Heating optimization: The electromagnetic three-way valve 4 is fixed at 20% opening (only 20% of the heat medium enters the water storage tank 1 to maintain the water temperature), and 80% of the heat medium flows back directly through the bypass box 8. The circulation pump 5 runs at a low speed of 500r / min, and its core function is to remove the waste heat of the PVT panel 6 (to prevent the photovoltaic panel temperature from being greater than 65℃).

[0051] Maximizing power supply: Photovoltaic power is prioritized to charge battery 12 through the BMS system until SOC=100%. After full charge, the power is converted into 220V AC power by the inverter and prioritized to supply household loads. Excess power can be sold to the grid (subject to grid permission).

[0052] Exit conditions: When the water temperature drops below 53℃ (including the 2℃ buffer zone), it will revert to the transition adjustment mode; when the light intensity is <100W / ㎡ (before sunset), it will enter the night standby mode.

[0053] III. Special Operating Condition Response Procedures

[0054] (a) Cloudy / rainy days / low light (light intensity < 200W / ㎡)

[0055] If the water temperature in storage tank 1 is <40℃: the controller will automatically start the electric auxiliary heating, giving priority to the power of battery 12 (when SOC≥20%). After battery 12 is depleted, it will switch to grid power supply to ensure that the water temperature is maintained above 40℃.

[0056] If the water temperature in the tank is ≥40℃: stop the heating cycle of PVT board 6, and only retain the anti-freeze cycle for 5 minutes per hour. Photovoltaic power generation will prioritize powering the standby equipment of the system and will not charge battery 12.

[0057] (ii) Peak water usage period (preset 18:00-20:00)

[0058] Two hours in advance (16:00), the "water usage prediction logic" is triggered. Regardless of the current mode, the opening of the electromagnetic three-way valve 4 is temporarily increased by 20%, and the speed of the circulation pump 5 is increased by 500r / min to ensure that the water temperature is maintained at 50-55℃.

[0059] If the water temperature drops suddenly during use (e.g., drops by ≥5℃ within 5 minutes), the priority heating mode will be activated immediately, and the water temperature will be raised back to above 45℃ within 30 minutes.

[0060] Example 2

[0061] In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that a support frame 14 is provided at the bottom of the water storage tank 1, and the support frame 14 is fixedly connected to the bottom of the PVT board 6.

[0062] The design uses a support frame 14 to fix the water storage tank 1 and the PVT board 6 into a whole, which enhances the structural stability of the two after installation on the roof and avoids equipment displacement or loosening of connections due to external forces such as wind and vibration. It is especially suitable for scenarios with strong winds on the roof or complex installation environments.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A green building energy-saving roof solar module, comprising: Water storage tank; Its features include: an exchange pipe, which is disposed inside the water storage tank, one end of the exchange pipe is fixedly connected to a first inlet pipe, one end of the first inlet pipe is fixedly connected to an electromagnetic three-way valve, the input end of the electromagnetic three-way valve is fixedly connected to a circulation pump, one end of the circulation pump is provided with a PVT plate, the circulation pump is connected to the heat exchange tube inside the PVT plate, and the heat exchange tube inside the PVT plate collects heat energy; The second inlet pipe is fixedly connected to one side of the electromagnetic three-way valve, and a bypass box is fixedly connected to one end of the second inlet pipe. The bypass box dissipates heat from the heat medium inside the second inlet pipe.

2. The green building energy-saving roof solar module according to claim 1, characterized in that: The other end of the heat exchange tube is fixedly connected to a first return tube, which is fixedly connected to one side of the PVT plate and connected to the heat exchange tube inside the PVT plate.

3. The green building energy-saving roof solar module according to claim 2, characterized in that: A second return pipe is fixedly connected to one side of the bypass box, and the second return pipe is fixedly connected to one side of the surface of the first return pipe.

4. The green building energy-saving roof solar module according to claim 2, characterized in that: The outer layer of the water storage tank is wrapped with thermal insulation material such as polyurethane foam, and a slot adapted to the first return pipe is opened on one side of the water storage tank.

5. The green building energy-saving roof solar module according to claim 1, characterized in that: A battery is installed on one side of the internal battery cells of the PVT board, and the battery is located inside the bypass box.

6. The green building energy-saving roof solar module according to claim 5, characterized in that: The bypass box is fixedly connected to a partition plate, and the battery is located inside the bypass box away from the partition plate.

7. The green building energy-saving roof solar module according to claim 1, characterized in that: The bottom of the water storage tank is equipped with a support frame, which is fixedly connected to the bottom of the PVT board.

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