Solar large flat plate collector and electric boiler combined heating system

Abstract

The utility model discloses a solar large flat plate collector and electric boiler combined heating system which is a direct water flowing open type system and is divided into an overground part and an underground part. The overground part is provided with a large heat collection matrix formed by connecting a plurality of solar anti-freezing large flat plate heat collectors in series; the underground part is provided with a buried heat storage water tank, a circulating water pump, a remote intelligent controller and an electric boiler, the solar heat collection part adopts direct water as a circulating working medium, and water supplement and water supply between the solar heat collection part and the buried heat storage water tank share a solar water supplement and water return pipeline; water feeding and water discharging of solar energy are controlled through automatic switching between the three-way valve and the circulating water pump; coil pipe or plate heat exchange operation is adopted between the buried heat storage water tank and the heating terminal, and meanwhile, coil pipe heat exchange can be adopted, and domestic washing hot water is taken into account. The system is stable, efficient, resistant to hail, automatic in frost, free of anti-freezing solution and pollution, capable of achieving roof heat insulation and preventing overheating and high pressure of the system, small in operation resistance and long in service life.

Description

Technical Field

[0001] This utility model belongs to the field of solar heating technology, specifically relating to a combined heating system of a large flat solar collector and an electric boiler. Background Technology

[0002] In existing technologies, electric auxiliary heating using solar-powered boilers typically involves a closed-loop system consisting of a solar collector, a solar collector circulation pump, a flat-plate solar collector, a plate heat exchanger, and a liquid storage tank. The liquid storage tank is pre-filled with antifreeze as the heat transfer medium. On the other side of the plate heat exchanger, a circulation system is formed by a water storage tank, an electric boiler, an electric boiler circulation pump, and radiators. Solar heat is transferred through the plate heat exchanger. However, existing technical solutions are costly, complex, and difficult to implement. Utility Model Content

[0003] Purpose of the utility model: In order to overcome the shortcomings of the existing technology, this utility model provides a combined heating system of a large flat solar collector and an electric boiler.

[0004] Technical solution: A solar large flat plate collector combined with an electric boiler heating system, wherein the heating system includes a solar anti-freeze large flat plate collector, solar water supply and return pipes, a remote intelligent controller, a circulating water pump, an electric boiler, an underground hot water storage tank and radiators; the heating system is a direct water flow open system, and the entire system is divided into two parts: an above-ground part and an underground part.

[0005] The above-ground portion has a large solar collector matrix composed of several large, anti-freezing flat-plate solar collectors connected in series. Ventilation holes are provided at the connection points of the series-connected large, anti-freezing flat-plate solar collectors for ventilation.

[0006] The solar antifreeze large flat plate collector is a copper-aluminum composite flat plate collector. The antifreeze measure is mechanical automatic antifreeze, and the heat collection method is direct heat exchange via thermosiphon.

[0007] The solar anti-freeze large flat plate collector uses a dual-channel hot water exchange tank as a heat collection and storage tank. The heat collection and storage tanks are directly connected by large-diameter heat exchange tubes. It can be operated in open mode or in pressurized closed mode.

[0008] The underground portion includes a buried hot water storage tank, a circulating water pump, a remote intelligent controller, and an electric boiler. The solar thermal collector uses direct water as the circulating medium. The solar thermal collector and the buried hot water storage tank share a single solar water supply and return pipe. The water supply and drainage of the solar water system are controlled by an automatic switching mechanism between a three-way valve and the circulating water pump. The buried hot water storage tank and the heating terminal operate using coil or plate heat exchanger. Coil heat exchanger can also be used to provide hot water for domestic washing.

[0009] As an optimization: the external dimensions of the solar anti-freeze large flat plate collector are 2m*2m*0.1m, the total area is 4.0 square meters, and the light-receiving area is 3.71 square meters.

[0010] As an optimization: the heat collection and storage water tank is made of SUS304 stainless steel, the outer shell is made of color-coated steel sheet, the external dimensions are 480mm*2.08m, and the inner tank dimensions are 360mm*1.96m.

[0011] As an optimization: the insulation layer of the heat collection manifold in the heat collection and storage water tank is formed by integral foaming of 0.06m polyurethane.

[0012] Beneficial effects: This utility model is applicable to district heating in high-altitude areas, high-end commercial hot water supply, and industrial hot water applications, and is particularly suitable for large-scale series systems; the system of this utility model is stable, efficient, hail-resistant, automatically defrosts, requires no antifreeze and is pollution-free, has roof insulation to prevent system overheating and high pressure, has low system operating resistance, and a longer lifespan.

[0013] The advantages of this invention's direct water flow primary heat exchange system are as follows:

[0014] 1. This utility model's system utilizes a large solar-powered antifreeze plate that allows water to be used directly as the circulating medium. Direct water heat exchange reduces heat loss caused by secondary heat exchange, increasing thermal efficiency by over 10%. Direct water circulation eliminates the need for heat exchangers during operation, saving on pipework, heat exchanger, and other equipment materials. Using water as the circulating medium also avoids the need for periodic antifreeze replenishment due to high-temperature evaporation, completely eliminating the material and labor costs associated with replenishing the antifreeze due to leaks, drips, and evaporation.

[0015] 2. This utility model uses an open, non-powered, atmospheric pressure water circulation solar collector system, which is safer and more reliable. There is no excessively high operating pressure in the solar collector system, all components are in good working condition, the failure rate is extremely low, and safe operation can be ensured for a longer period of time.

[0016] 3. This utility model uses water as a circulating medium, making it more environmentally friendly and a truly green and energy-saving product. The solar energy system is friendly and harmonious with the surrounding environment during operation.

[0017] 4. The system of this utility model uses a dual-channel heat exchange tank as a heat collection and storage tank. The tanks are directly connected by large-diameter heat exchange tubes. It can be operated in open or pressurized closed mode. The heat exchange is fast and the flow resistance is low. The DN50 dual-channel system solves the problem that ordinary small-channel collectors cannot be connected in series. It also eliminates the need for a large heat storage tank and a complex secondary heat exchange system, maximizing the use of heat generated by the solar thermal system and reducing operating costs.

[0018] 5. Because this utility model's system does not use antifreeze, there is no problem with antifreeze overheating and evaporation. The entire system is filled with water, so there is no need to invest in operating costs in summer to prevent various problems caused by system overheating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the above-ground structure of the combined solar large flat plate collector and electric boiler heating system of this utility model.

[0020] Figure 2 This is a schematic diagram of the underground structure of the combined heating system of a large flat-plate solar collector and an electric boiler according to this utility model. Detailed Implementation

[0021] Example

[0022] like Figure 1-2 As shown, a solar large flat plate collector combined with an electric boiler heating system is disclosed. The heating system includes a solar anti-freeze large flat plate collector 1, a solar water supply and return pipe 2, a remote intelligent controller 3, a circulating water pump 4, an electric boiler 5, an underground hot water storage tank 6, and radiators 7.

[0023] The heating system is a direct-flow, open-type system, divided into two parts: an above-ground section and an underground section. The above-ground section has a large solar collector matrix composed of several large, anti-freeze flat-plate solar collectors 1 connected in series. Ventilation holes 8 are provided at the connection points of the series-connected large, anti-freeze flat-plate solar collectors 1 for ventilation.

[0024] The solar antifreeze large flat plate collector is a copper-aluminum composite flat plate collector with external dimensions of 2m*2m*0.1m, a total area of ​​4.0 square meters, a light-receiving area of ​​3.71 square meters, and antifreeze measures of mechanical automatic antifreeze. The heat collection method is thermosiphon (non-powered micro-circulation) direct heat exchange.

[0025] The aforementioned solar anti-freeze large flat plate collector uses a dual-channel heat exchange tank as the heat collection and storage tank. Heat exchange between the heat collection and storage tanks is directly achieved through large-diameter heat exchange tubes, allowing for either open or pressurized closed operation. The heat collection and storage tank is made of SUS304 stainless steel, with a color-coated steel shell. Its external dimensions are 480mm*2.08m, and the internal tank dimensions are 360mm*1.96m. The insulation layer of the heat collection manifold within the heat collection and storage tank is formed using 0.06m polyurethane integral foaming.

[0026] The underground portion includes a buried hot water storage tank, circulating water pumps, a remote intelligent controller, an electric boiler, and other equipment. The solar thermal collector uses direct water as the circulating medium; it operates in an open system, with a shared solar water supply and return pipeline connecting the solar thermal collector and the buried hot water storage tank. Automatic switching between a three-way valve and the circulating water pump controls the water supply and drainage from the solar system. The buried hot water storage tank and the heating terminals utilize coil or plate heat exchangers; coil heat exchangers can also be used for domestic hot water supply and washing.

[0027] The system control process of this utility model is as follows:

[0028] 1. Automatic temperature difference reflux for solar collectors: When T1-T2 ≥ 8℃ (adjustable), the electric three-way valve F1 is activated, closing the water supply pump P2 port and opening the return water pump P1 port. At the same time, the return water pump P1 starts, pumping the high-temperature water in the hot water storage tank of the ground-mounted solar antifreeze flat plate back to the underground water tank. (There is a height difference between the ground and underground, so a small-power water pump can be selected).

[0029] When the water in the large flat-plate water tank on the ground flows back to a certain level, the water level sensor L (adjustable) senses the low water level and sends a signal back to the control terminal. The return water pump P1 automatically stops, and the electric three-way valve F1 activates, closing the return water pump P1 port and the makeup water pump P2 port. At this time, if the riser pipe temperature sensor T4 ≥ 8℃ (adjustable), and the water level sensor L reaches the set low level, the electric three-way valve F1 opens the makeup water pump P2 port and closes the return water pump P1 port. Simultaneously, the makeup water pump P2 starts, pumping the cold water at the bottom of the underground hot water storage tank (the hot and cold water in the tank are stratified due to their different densities, with the hot water on top and the cold water on the bottom) into the integrated water tank of the ground unit. When the water level sensor L (adjustable) in the integrated water tank of the ground unit senses that the water level has reached the set level, it sends a signal back to the control terminal, and the makeup water pump P2 automatically stops. Simultaneously, the electric three-way valve F1 activates, closing the P2 port of the water supply pump and the P1 port of the return water pump. Solar heating then begins automatically. When there is a temperature difference between T1 and T2, this cycle repeats until the water in the underground hot water storage tank reaches the required temperature. In manual mode, the above actions can be forced through the controller.

[0030] 2. Auxiliary Heating (Electric Boiler FH): The control adopts a time-segmented, time-based, fixed-temperature heating method during the day and night. Automatic auxiliary heating during the day: When T3 ≤ 55℃ (adjustable, range: 0~99), P4 cycle is activated, and boiler FH starts heating; when T3 ≥ 60℃ (adjustable, range: 0~99), P4 is deactivated, and boiler FH stops heating. At night: When T3 ≤ 50℃ (adjustable, range: 0~99), P3 cycle is activated, and heat pump FH heats; when T3 ≥ 60℃ (adjustable, range: 0~99), P4 is deactivated, and boiler FH stops heating. Manual mode: The heating action of other energy sources can be forcibly controlled via the controller.

[0031] 3. Domestic hot water supply relies on the pressure of tap water entering the coil for heat exchange and water supply, and the terminal is equipped with an automatic thermostatic regulating valve for constant temperature water supply.

[0032] 4. During heating operation, when the indoor thermostat temperature is ≤15℃ (the lower heating limit temperature is adjustable), the heating circulation pump P4 starts. When the indoor thermostat temperature is ≥18℃ (the upper heating limit temperature is adjustable), the heating circulation pump P4 stops.

[0033] 5. The underground hot water storage tank is automatically controlled by a float switch and is independently controlled. (The water level is designed to accommodate the return water from the above-ground solar water heater.)

[0034] 6. System Anti-freezing Process: The ground-mounted solar panel and the connecting pipes between units utilize mechanical anti-freezing technology, automatically resisting freezing in icy conditions and automatically thawing under sunlight. The outdoor main pipe relies on deep underground burial for anti-freezing. All water inlet risers connected to the integrated unit's inlet rely on automatic backflow to the underground hot water storage tank for anti-freezing (provided the underground tank is lower than the ground-mounted riser). When T4 ≤ 5℃ (adjustable set temperature), the electric three-way valve F1 activates, opening the return water pump P1 port and the replenishment water pump P2 port. Water in the ground-mounted integrated unit's tank begins to flow back until the water in the ground-mounted riser is automatically emptied. The backflow process does not freeze, and after completion, the riser is emptied without freezing, achieving the anti-freezing purpose. When the water level in the integrated unit's built-in tank drops to the set level, the replenishment water pump P1 will not activate to replenish water because the T4 temperature is lower than the set temperature.

[0035] The foregoing description clearly and completely illustrates the technical solutions in the embodiments of this utility model, enabling those skilled in the art to better understand the advantages and features of this utility model, thereby providing a clearer definition of the scope of protection of this utility model. The embodiments described in this utility model are merely some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

Claims

1. A combined solar flat-plate collector and electric boiler heating system, characterized in that: The heating system includes a solar anti-freeze large flat plate collector, solar water supply and return pipes, a remote intelligent controller, a circulating water pump, an electric boiler, an underground hot water storage tank, and radiators; the heating system is a direct-flow open system, and the entire system is divided into two parts: the above-ground part and the underground part. The above-ground portion has a large solar collector matrix composed of several large, anti-freezing flat-plate solar collectors connected in series. Ventilation holes are provided at the connection points of the series-connected large, anti-freezing flat-plate solar collectors for ventilation. The solar antifreeze large flat plate collector is a copper-aluminum composite flat plate collector. The antifreeze measure is mechanical automatic antifreeze, and the heat collection method is direct heat exchange via thermosiphon. The solar anti-freeze large flat plate collector uses a dual-channel hot water exchange tank as a heat collection and storage tank. The heat collection and storage tanks are directly connected by large-diameter heat exchange tubes, and can be operated in open or pressurized closed mode. The underground portion includes a buried hot water storage tank, a circulating water pump, a remote intelligent controller, and an electric boiler. The solar thermal collector uses direct water as the circulating medium. The solar thermal collector and the buried hot water storage tank share a single solar water supply and return pipe. The water supply and drainage of the solar water system are controlled by an automatic switching mechanism between a three-way valve and the circulating water pump. The buried hot water storage tank and the heating terminal operate using coil or plate heat exchanger. Coil heat exchanger can also be used to provide hot water for domestic washing.

2. The combined solar large flat plate collector and electric boiler heating system according to claim 1, characterized in that: The solar antifreeze large flat plate collector has external dimensions of 2m*2m*0.1m, a total area of ​​4.0 square meters, and a light-receiving area of ​​3.71 square meters.

3. The combined solar flat-plate collector and electric boiler heating system according to claim 1, characterized in that: The aforementioned heat collection and storage water tank is made of SUS304 stainless steel, with a color-coated steel plate outer shell, external dimensions of 480mm*2.08m, and internal tank dimensions of 360mm*1.96m.

4. The combined solar flat-plate collector and electric boiler heating system according to claim 1, characterized in that: The heat collection manifold insulation layer in the aforementioned heat collection and storage water tank is formed by integral foaming of 0.06m polyurethane.

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