A heating system and a control method thereof

Abstract

The present application relates to the technical field of energy, and discloses a heating system and a control method thereof. The heating system comprises a heating device, a solar heat collector and a heat pump unit, which are connected in series to form a first heating circulation loop; the heating device and the heat pump unit are connected to form a second heating circulation loop without the solar heat collector; the heating system further comprises a switching unit, which can switch on the first heating circulation loop and the second heating circulation loop. The control method comprises the following steps: when the first heating circulation loop is running, if a set opening condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop; when the second heating circulation loop is running, if a set closing condition is met, the switching unit switches on the second heating circulation loop and switches off the first heating circulation loop. The heating system disclosed by the present application can switch the heating circulation loop according to the demand, reduce energy loss and ensure that the heating demand is effectively met.

Description

Technical Field

[0001] This invention relates to the field of heating technology, and in particular to a heating system and its control method. Background Technology

[0002] In northern regions, indoor heating in winter is usually achieved through centralized heating. However, in rural or remote areas, there are difficulties in building and fully covering centralized heating networks, forcing residents to rely on conventional heating equipment such as coal, electric heaters, or modified coal stoves.

[0003] Modified coal stoves refer to the alteration of traditional coal stoves by adding water tanks, circulation pipes, and radiators. The coal stove heats the water in the tank, and the hot water circulates through the pipes to the radiators, where it exchanges heat within the room to maintain a constant temperature. However, coal stoves pose significant safety hazards, cannot operate normally at night, cannot guarantee the required room temperature, and result in the waste of coal resources and environmental pollution.

[0004] Therefore, there is an urgent need for an environmentally friendly and clean heating system and its control method to meet residents' winter heating needs. Summary of the Invention

[0005] One object of the present invention is to provide a heating system to meet the heating needs of residents in winter and to improve the safety and reliability of heating.

[0006] Another objective of this invention is to provide a control method for a heating system to better meet the heating needs during winter.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A heating system includes heating equipment, a solar collector, and a heat pump unit. The heating equipment, the solar collector, and the heat pump unit are connected in series to form a first heating circulation loop. The heating equipment and the heat pump unit are connected to form a second heating circulation loop that is not connected to the solar collector. The heating system also includes a switching unit capable of switching between the first heating circulation loop and the second heating circulation loop.

[0009] As a preferred technical solution for a heating system, the heating equipment, the solar collector, and the heat pump unit are connected in series along the direction of fluid flow to form the first heating circulation loop. A bypass pipe is provided between the outlet of the heating equipment and the inlet of the heat pump unit. The switching unit includes a bypass control valve installed on the bypass pipe, which is used to control the opening and closing of the bypass pipe. By connecting the heating equipment, the solar collector, and the heat pump unit in series along the direction of fluid flow, the cold water flowing out of the heating equipment is first preheated by the solar collector and then further heated by the heat pump unit. Since the water temperature entering the solar collector is relatively low, the heat generated by solar energy can be fully utilized to heat the water, increasing the water temperature entering the heat pump unit and reducing the energy loss of the heat pump unit, thereby saving energy and ensuring the energy efficiency of the heating system.

[0010] As a preferred technical solution for a heating system, the heating system further includes a first temperature detection device. This first temperature detection device is used to detect the water temperature in the water tank inside the solar collector. The switching unit controls the switching between the first heating circulation loop and the second heating circulation loop based on the first temperature value detected by the first temperature detection device. By setting the first temperature detection device to detect the water temperature in the water tank inside the solar collector, the solar heat collection effect of the solar collector can be effectively determined, enabling the controller to automatically determine whether the solar collector can heat the water, thus improving the automation of the heating system control.

[0011] As a preferred technical solution for a heating system, the heating system further includes a second temperature detection device. This second temperature detection device detects the water temperature flowing into the solar collector. The switching unit controls the switching between the first and second heating circulation loops based on the temperature difference detected by the first and second temperature detection devices. When the temperature difference detected by the first and second temperature detection devices is large, it indicates that the solar collector has a good heating effect on the water entering the system, effectively heating the water in the heating circulation. When the temperature difference detected by the first and second temperature detection devices is small, it indicates that the water temperature flowing into the solar collector is not significantly different from the water temperature after being heated by the solar collector, making it difficult for the solar collector to effectively heat the water. Determining whether the bypass control valve is open based on the temperature difference detected by the first and second temperature detection devices ensures the effectiveness of the solar collector in heating the water.

[0012] As a preferred technical solution for a heating system, a buffer water tank is connected in series on the connecting pipe between the inlet of the heat pump unit and the outlet of the solar collector, with the inlet of the buffer water tank being higher than its outlet. By setting up the buffer water tank, the smooth flow of fluid in the circulation pipeline can be ensured, avoiding fluid flow obstruction caused by sudden changes in fluid flow pressure due to external ambient temperature or sunlight intensity, or fluid interruption due to fluid evaporation, thus improving the safety and reliability of the heating system.

[0013] As a preferred technical solution for a heating system, the buffer water tank is provided with an external water inlet, which is used to connect external water-using equipment;

[0014] The outlet of the heat pump unit is connected to the inlet of the buffer water tank by a heat pump heating pipe, and a first control valve is installed on the heat pump heating pipe to control the on / off state of the heat pump heating pipe; and / or

[0015] A bypass return water pipe is connected between the outlet of the buffer water tank and the inlet of the solar collector. A bypass circulation pump and a second control valve for controlling the opening and closing of the bypass return water pipe are installed on the bypass return water pipe.

[0016] The installation of heat pump heating pipes and bypass return water pipes allows the heat pump unit and solar collector to be connected in parallel, and can simultaneously heat the water in the buffer tank, improving heating efficiency and effectively meeting the demand for hot water in domestic water use.

[0017] As a preferred technical solution for a heating system, the solar collector is equipped with a first water level gauge, which is used to detect the water level in the internal water tank of the solar collector. The buffer water tank is connected to a water supply pipe, which replenishes water to the buffer water tank according to the detection value of the first water level gauge; and / or

[0018] The buffer tank is equipped with a second water level gauge, which is used to detect the water level in the buffer tank. The buffer tank is connected to a water supply pipe, which replenishes water to the buffer tank according to the detection value of the water level gauge.

[0019] As a preferred technical solution for a heating system, the buffer water tank is equipped with an electric heater.

[0020] As a preferred technical solution for a heating system, the heating system further includes:

[0021] Total heat meter, the total heat meter being used to detect the heat energy consumed by water flowing through the heating equipment; and / or

[0022] A calorific value meter is used to detect the increase in heat energy after water flows through the heat pump unit.

[0023] A control method for a heating system, using the heating system described above, and the control method includes the following steps:

[0024] When the first heating circulation loop is running, if the set opening conditions are met, the switching unit connects the second heating circulation loop and disconnects the first heating circulation loop.

[0025] When the second heating circulation loop is running, if the set shutdown conditions are met, the switching unit connects the second heating circulation loop and disconnects the first heating circulation loop.

[0026] As a preferred technical solution for a heating system, the set opening condition is: the water temperature in the water tank inside the solar collector is greater than or equal to a first temperature value, and / or the temperature difference between the water temperature in the water tank inside the solar collector and the water temperature at the inlet of the solar collector is greater than or equal to a first temperature difference value.

[0027] The set shut-off condition is: the water temperature in the water tank inside the solar collector is less than or equal to the second temperature value, or the temperature difference between the water temperature in the water tank inside the solar collector and the water temperature at the inlet of the solar collector is less than or equal to the second temperature difference value.

[0028] The first temperature value minus the second temperature value is ≥5℃, and the first temperature difference value minus the second temperature difference value is ≥3℃.

[0029] The beneficial effects of this invention are as follows:

[0030] The heating system provided by this invention employs a series connection of solar collectors, heat pump units, and heating equipment. When there is sunlight, the first heating circulation loop is activated, using the solar collectors and heat pump units to reheat the water flowing to the heating equipment. This avoids the problem of insufficient heat caused by using only solar collectors or heat pump units for hot water heating in winter, ensuring heating temperature and comfort, and effectively reducing the loss of electricity and coal resources, thus saving energy. When there is no sunlight or low light levels, the first heating circulation loop is disconnected, and the second heating circulation loop is activated, allowing the heat pump unit to heat the water in the heating equipment alone. This ensures continuous and effective heating, improving the reliability of the heating system. Furthermore, using heat pump units and solar collectors to heat the water in the heating equipment results in less environmental pollution, higher energy cleanliness, and improved safety of the heating system.

[0031] The control method for the heating system provided by this invention can better meet the heating needs in winter and improve the continuity and reliability of heating. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the heating system provided in Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the heating system provided in Embodiment 2 of the present invention.

[0034] The markings in the image are as follows:

[0035] 1. Radiator; 2. Solar collector; 3. Heat pump unit; 4. Buffer tank; 5. Circulation pump; 6. Bypass control valve; 7. Total heat meter; 8. Individual heat meter; 9. Main electricity meter; 10. Individual electricity meter; 11. Cold water return pipe; 12. Water tank inlet pipe; 13. Water tank outlet pipe; 14. Hot water supply pipe; 15. Make-up water pipe; 16. First switch valve; 17. Second switch valve; 18. Third switch valve; 19. Water pump; 20. Inlet valve; 21. Filter; 22. Fourth switch valve; 23. Solar controller; 24. Heat pump controller; 25. Electric heater; 26. Second water level gauge; 27. Bypass pipe; 28. Heat pump heating pipe; 29. ​​First control valve; 30. Bypass return pipe; 31. Second control valve; 32. Bypass circulation pump.

[0036] Figure 1 In the diagram, solid lines represent pipelines, dashed lines represent circuits, and arrows indicate the direction of fluid flow. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a heating system that can be applied to rural areas in northern China not covered by centralized heating networks, as well as other regions in the south that require heating. Furthermore, the heating system provided in this embodiment can be used in residential homes, factories, schools, and other indoor environments. This invention does not limit the application scenarios of the heating system.

[0043] Specifically, the heating system includes heating equipment, solar collector 2, and heat pump unit 3. The heating equipment, solar collector 2, and heat pump unit 3 are connected in series to form a first heating circulation loop. The heating equipment and heat pump unit 3 are connected to form a second heating circulation loop that is not connected to the solar collector 2. The heating system also includes a switching unit that can switch between the first heating circulation loop and the second heating circulation loop.

[0044] In other words, the heating system provided in this embodiment, by using a series connection of solar collector 2, heat pump unit 3, and heating equipment, allows the first heating circulation loop to be open and the second heating circulation loop to be closed when there is sunlight. This means that the solar collector 2 and heat pump unit 3 reheat the water flowing to the heating equipment, avoiding the problem of insufficient heat caused by using only the solar collector 2 or only the heat pump unit 3 for hot water heating in winter. This ensures heating temperature and comfort, and effectively reduces the loss of electricity and coal resources, saving energy. When there is no sunlight or weak sunlight, the first heating circulation loop is closed and the second heating circulation loop is open, allowing only the heat pump unit 3 to heat the water in the heating equipment, ensuring continuous and effective heating and improving the reliability of the heating system. Furthermore, using the heat pump unit 3 and solar collector 2 to heat the water in the heating equipment results in less environmental pollution, higher energy cleanliness, and improved safety of the heating system.

[0045] In this embodiment, the heating equipment, solar collector 2, and heat pump unit 3 are connected in series along the medium flow direction to form the first heating circulation loop described above. A bypass pipe 27 is provided between the outlet of the heating equipment and the inlet of the heat pump unit 3. The switching unit includes a bypass control valve 6 installed on the bypass pipe 27, which is used to control the opening and closing of the bypass pipe 27. The heating system also includes a circulation pump 5 for promoting the flow of fluid from the heat pump unit 3 to the heating equipment.

[0046] This configuration, by connecting the solar collector 2, heat pump unit 3, and heating equipment in series along the fluid flow direction, enables the formation of a first heating circulation loop for fluid flow within the solar collector 2, heat pump unit 3, and heating equipment. By installing a bypass pipe 27 between the outlet of the heating equipment and the inlet of the heat pump unit 3, when the bypass pipe 27 is open, the resistance of the fluid flowing through the bypass pipe 27 is much smaller than the resistance of the fluid flowing through the solar collector 2. Therefore, the fluid flowing out of the heating equipment basically no longer passes through the solar collector 2, but flows directly to the heat pump unit 3 through the bypass pipe 27. Thus, the heat pump unit 3 and the heating equipment are connected in series to form a second heating circulation loop for fluid flow.

[0047] In this embodiment, by connecting the heating equipment, the solar collector 2, and the heat pump unit 3 in series along the fluid flow direction, the cold water flowing out of the heating equipment is first preheated by the solar collector 2, and then heated by the heat pump unit 3. Since the water temperature entering the solar collector 2 is low, the heat generated by solar energy can be fully utilized to heat the water, thereby increasing the water temperature entering the heat pump unit 3 and reducing the energy loss of the heat pump unit 3. This is more conducive to saving energy and ensuring the energy efficiency of the heating system.

[0048] It is understandable that in this embodiment, when the bypass control valve 6 is opened, even if the part of the pipeline connecting the inlet and outlet of the solar collector 2 is not blocked by the valve or other structure, the water no longer flows to the solar collector 2 due to the influence of fluid flow resistance. Therefore, the first heating circulation loop is actually in a disconnected state due to flow resistance.

[0049] In this embodiment, preferably, the automatic on / off switching of the bypass pipe 27 is controlled by detecting the heat collection status and heating state of the solar collector 2, thereby achieving automated and intelligent control of the heating system. Specifically, the heating system includes a first temperature detection device and a controller. The first temperature detection device is installed on the solar collector 2 and is used to detect the water temperature in the water tank inside the solar collector 2. The switching unit controls the switching between the first heating circulation loop and the second heating circulation loop based on the first temperature value detected by the first temperature detection device. In this embodiment, specifically, the controller is connected to the first temperature detection device and the bypass control valve 6, and the controller controls the on / off switching of the bypass control valve 6 based on the first temperature value detected by the first temperature detection device.

[0050] By setting a first temperature detection device to detect the water temperature in the water tank inside the solar collector 2, the solar heat collection effect of the solar collector 2 can be effectively determined. This allows the controller to automatically determine whether the solar collector 2 can heat the water, improving the automation of the heating system control: when the water temperature in the solar collector 2 is higher than or equal to the first temperature value, it indicates that the solar collector 2 has an effective heating capacity and can participate in the heating cycle to heat the water; when the water temperature in the solar collector 2 is lower than the second temperature value, it indicates that the current heat collection effect of the solar collector 2 is poor and it cannot heat the water flowing into the solar collector 2. Therefore, it can be ensured that when the sunlight is suitable, the solar collector 2 can participate in the heating cycle, ensuring the effective utilization of solar energy and reducing the loss of the heat pump unit 3; when the sunlight is insufficient, the solar collector 2 can be prevented from participating in the heating cycle, reducing the energy loss of the solar collector 2.

[0051] Furthermore, the heating system also includes a second temperature detection device, which is installed on the cold return water pipe 11 connecting the inlet of the solar collector 2 and the outlet of the heating equipment, and is used to detect the water temperature flowing into the solar collector 2. The controller can control the opening and closing of the bypass control valve 6 based on the temperature difference detected by the first and second temperature detection devices, that is, control the switching between the first heating circulation loop and the second heating circulation loop.

[0052] When the temperature difference detected by the first and second temperature detection devices is large, it indicates that the solar collector 2 has a good heating effect on the water entering the unit, effectively heating the water in the heating cycle. When the temperature difference detected by the first and second temperature detection devices is small, it indicates that the water temperature flowing into the solar collector 2 is not much different from the water temperature after being heated by the solar collector 2, making it difficult for the solar collector 2 to effectively heat the water. Using the temperature difference detected by the first and second temperature detection devices to determine whether the bypass control valve 6 is open ensures the effectiveness of the solar collector 2 in heating the water.

[0053] Preferably, when the set opening conditions are met, the closed bypass control valve 6 opens, and when the bypass control valve 6 opens, the controller controls the bypass control valve 6 to automatically close after the set closing conditions are met. The set opening conditions are: when the water temperature detected by the first temperature detection device is greater than a first temperature value and the temperature difference detected by the first temperature detection device and the second temperature detection device is greater than or equal to the first temperature difference value; the set closing conditions are: when the water temperature detected by the first temperature detection device is less than the second temperature value, or when the temperature difference detected by the first temperature detection device and the second temperature detection device is less than or equal to the second temperature difference value; the first temperature value - the second temperature value ≥ 5℃, and the first temperature difference value - the second temperature difference value ≥ 3℃.

[0054] The above settings further ensure that the solar collector 2 participating in the heating cycle of the heating equipment not only has the effectiveness of solar heat collection, but also the effectiveness of heating the water in the circulation pipeline. This avoids the problem that simply detecting the water temperature in the water tank inside the solar collector 2 to determine the on / off state of the bypass control valve 6 can lead to the collection of solar energy but ineffective water heating. This ensures the efficiency of the heating system and reduces its energy consumption. Simultaneously, since the temperature of sunlight changes constantly when exposed to sunlight, the heating and cooling of the water in the water tank inside the solar collector 2 requires a certain amount of time. Setting the first temperature value - second temperature value ≥ 5℃ and the first temperature difference value - second temperature difference value ≥ 3℃ helps ensure that even if the water temperature in the water tank is slightly lower than the second temperature value during operation, the bypass control valve 6 will not close. This avoids frequent opening and closing of the bypass control valve 6, improves the operational safety and reliability of the heating system, reduces energy loss, and ensures the efficiency of solar energy utilization.

[0055] In this embodiment, preferably, the second temperature value is 30℃~40℃, and the first temperature value is 40℃~55℃. The first temperature difference value is 2℃~8℃, and the second temperature difference value is 8℃~15℃.

[0056] Preferably, a buffer tank 4 is connected in series on the connecting pipe between the inlet of the heat pump unit 3 and the outlet of the solar collector 2, with the inlet of the buffer tank 4 being higher than its outlet. By setting up the buffer tank 4, the smooth flow of fluid in the circulation pipe can be ensured, avoiding fluid flow obstruction caused by sudden changes in fluid flow pressure due to external ambient temperature or sunlight intensity, or fluid interruption due to fluid evaporation, thus improving the safety and reliability of the heating system.

[0057] In this embodiment, the heat pump unit 3 and the solar collector 2 are installed on the roof, while the heating equipment and the buffer water tank 4 are installed indoors. The outlet of the heating equipment is connected to the inlet (return) of the solar collector 2 via a cold return water pipe 11. The outlet of the solar collector 2 is connected to the inlet of the buffer water tank 4 via a water tank inlet pipe 12. The outlet of the buffer water tank 4 is connected to the inlet of the heat pump unit 3 via a water tank outlet pipe 13. The outlet of the heat pump unit 3 is connected to the inlet of the heating equipment via a hot water supply pipe 14.

[0058] Preferably, the bypass pipe 27 is connected between the cold return water pipe 11 and the inlet of the buffer water tank 4, so that the buffer water tank 4 can always be located on the heating circulation pipe. At the same time, the length of the bypass pipe 27 can be shortened, thereby reducing the resistance of fluid flow to the bypass pipe 27, and thus reducing the amount of fluid flowing into the solar collector 2 when the bypass control valve 6 is opened.

[0059] To further improve the safety of the heating system, a first switch valve 16 is installed on both the cold return water pipe 11 and the water tank inlet pipe 12. The first switch valve 16 is a manual valve and is located above the bypass pipe 27. The first switch valve 16 manually controls the opening and closing of the cold return water pipe 11 and the water tank inlet pipe 12 that are not connected to the second heating circulation loop, thus completely disconnecting the solar collector 2 from the heating circulation loop, facilitating maintenance of the solar collector 2. Furthermore, because the first switch valve 16 is located above the bypass pipe 27, maintenance of the solar collector 2 can be performed while the second heating circulation loop is operating normally, improving the smoothness, safety, and reliability of the heating system's operation.

[0060] Both first switching valves 16 are normally open switching valves, and preferably, the first switching valve 16 located at the water inlet of the solar collector 2 has a flow regulation function to regulate the amount of water entering the solar collector 2.

[0061] The circulation pump 5 is installed on the water outlet pipe 13 of the water tank to provide greater power for the water to be drawn out of the buffer water tank 4, thereby saving the power of the circulation pump 5. Preferably, the circulation pump 5 is located near the water outlet of the buffer water tank 4.

[0062] To prevent water shortage in the buffer tank 4, a water supply pipe 15 is connected to the buffer tank 4, and an inlet valve 20 is installed on the water supply pipe 15. The end of the water supply pipe 15 not connected to the buffer tank 4 can be connected to a tap to replenish water to the buffer tank 4. To improve the smoothness of water replenishment, a water pump 19 is also installed on the water supply pipe 15 to drive water flow to the buffer tank 4.

[0063] In this embodiment, the water supply pipe 15 is connected to the water tank outlet pipe 13, and the connection point between the water supply pipe 15 and the water tank outlet pipe 13 is located between the outlet of the buffer water tank 4 and the circulating pump 5. This arrangement can reduce the number of water outlets in the buffer water tank 4, which is beneficial to ensuring the sealing and heat preservation performance of the buffer water tank 4. In other embodiments, the water supply pipe 15 can also be directly connected to the buffer water tank 4.

[0064] Furthermore, the solar collector 2 is equipped with a first water level gauge, which is used to detect the water level in the internal water tank of the solar collector 2. A buffer water tank 4 is connected to a water supply pipe 15, which replenishes water to the buffer water tank 4 according to the reading of the first water level gauge. This configuration, by detecting the water level in the internal water tank of the solar collector 2, enables automatic water replenishment to the buffer water tank 4, preventing water overflow and improving the safety and reliability of the solar collector 2.

[0065] In another embodiment, a second water level gauge is installed inside the buffer tank 4 to measure the water level. The second water level gauge is electrically connected to a controller, allowing the controller to replenish water to the buffer tank 4 based on the water level. This arrangement prevents water shortage in the heat pump unit 3 or the second heating circulation pipeline when using heating with the second heating circulation pipeline. With this arrangement, the solar collector 2 can also achieve automatic water filling via the buffer tank 4, or it can use other pipelines for automatic water filling.

[0066] Preferably, an electric heater 25 is installed inside the buffer water tank 4 to heat the water in the buffer water tank 4. When the water in the buffer water tank 4 freezes due to low ambient temperature, or when ice forms inside or outside the heat pump unit 3 or solar collector 2, the electric heater 25 can be activated to heat the water in the buffer water tank 4, allowing the heated water to circulate and be introduced into the heat pump unit 3 and solar collector 2 to defrost. Furthermore, the electric heater 25 can also participate in the heating cycle when the thermal efficiency of the air source heat pump and solar collector 2 is low, ensuring that the hot water entering the heating equipment has sufficient heat, further guaranteeing the reliability and flexibility of the heating system.

[0067] Preferably, the electric heater 25 is a heating tube, which facilitates its installation inside the buffer tank 4. Furthermore, to reduce heat loss, the buffer tank 4 is covered with an insulation layer, which can be, but is not limited to, made of insulation materials such as rock wool.

[0068] A second switch valve 17 is installed at both the inlet of the water tank 12 near the inlet of the buffer water tank 4 and the outlet of the water tank 13 near the outlet of the buffer water tank 4. The second switch valve 17 on the outlet of the water tank 13 is located between the outlet of the water tank and the connection point of the water supply pipe 15. The second switch valve 17 is a manual valve, and its installation ensures that no water flows out of the circulation pipe when the buffer water tank 4 is connected to or removed from the circulation pipe of the buffer water tank 4, facilitating the installation and removal of the buffer water tank 4. Furthermore, a filter 21 is installed on the outlet of the water tank 13. The filter 21 is located between the connection point of the circulation pump 5 and the water supply pipe 15, and is used to filter the water flowing out of the buffer water tank 4 to prevent impurities such as rust and dust carried out from the buffer water tank 4 from entering the heat pump unit 3, thereby improving the operational safety of the heating system.

[0069] In this embodiment, the controller includes an independently configured heat pump controller 24 and a solar energy controller 23. The solar energy controller 23 is connected to the solar collector 2, the bypass control valve 6, and the inlet valve 20, while the heat pump controller 24 is connected to the circulating pump 5 and the heat pump unit 3. By configuring the heat pump controller 24 and the solar energy controller 23, individual control of the heat pump unit 3 and the solar collector 2 can be achieved, reducing the complexity of controller configuration.

[0070] To better monitor the operation of the heating system, a total heat meter 7 and a partial heat meter 8 are also installed. Both the total heat meter 7 and the partial heat meter 8 are installed on the hot water supply pipe 14, and their built-in flow meters detect the flow rate on the hot water supply pipe 14. The two temperature probes of the total heat meter 7 detect the inlet and outlet water temperatures of the heating equipment, respectively, and thus obtain the total heat consumed by the heating equipment based on the temperature difference between the water flowing into and out of the heating equipment and the flow rate. The two temperature probes of the partial heat meter 8 detect the inlet and outlet water temperatures of the heat pump unit 3, respectively. The built-in flow meter of the heat meter 8 detects the flow rate of the hot water outlet pipe, and calculates the heat energy generated by the heat pump unit 3 based on the temperature difference between the inlet and outlet water temperatures and the detected flow rate value, thus clearly displaying the thermal efficiency of the heating system. At the same time, the heat energy generated by the solar collector 2 can also be calculated based on the difference between the total heat energy consumed by the heating equipment and the heat energy generated by the heat pump unit 3, thereby detecting the effect of the solar collector 2 and better controlling the operation of the heat pump unit 3 and the solar collector 2.

[0071] To detect the energy loss of the heating system, the system also includes a main meter 9 and a sub-meter 10. The main meter 9 is installed on the power supply circuit of the heat pump unit 3 and is used to calculate the total power consumption of the heat pump unit 3. The sub-meter 10 is installed on the connection circuit between the heat pump unit 3 and the circulating pump 5 and is used to calculate the power consumption of the circulating pump 5. The difference between the main meter 9 and the sub-meter 10 is the power consumption of the compressor in the heat pump unit 3. From this, the energy consumption and thermal efficiency of the heat pump unit 3 can be calculated.

[0072] In this embodiment, preferably, the heating equipment includes multiple radiators 1 arranged in parallel, and it is understood that the location and number of radiators 1 can be customized according to needs. Furthermore, each radiator 1 is equipped with a third switch valve 18 on both its inlet and outlet pipes. The installation of the third switch valve 18 improves the ease of disassembly, assembly, and maintenance of each radiator 1. In each radiator 1, the third switch valve 18 located at the inlet is preferably a switch valve compatible with both manual and electric operation to control the heating of the corresponding radiator, while the third switch valve 18 located at the outlet is preferably a manual switch valve to reduce costs.

[0073] In this embodiment, heat pump unit 3 is an air source heat pump. An air source heat pump is an energy-saving device that uses high-grade energy to transfer heat from a low-grade heat source (air) to a high-grade heat source. It can convert low-grade heat energy (such as the heat contained in air, soil, and water) that cannot be directly used into usable high-grade heat energy, thereby saving some high-grade heat energy (such as coal, natural gas, oil, and electricity), achieving energy conservation and emission reduction, and effectively reducing the cost of the heating system. The air source heat pump can use existing mature products, and this invention does not limit the structure of the air source heat pump.

[0074] Furthermore, to facilitate the disassembly, assembly, and maintenance of the heat pump unit 3, a fourth switch valve 22 is installed at the position of the water tank outlet pipe 13 near the water inlet of the heat pump unit 3 and at the position of the hot water supply pipe 14 near the water outlet of the heat pump unit 3. The fourth switch valve 22 is a manual switch valve.

[0075] Example 2

[0076] like Figure 2 As shown, this embodiment provides a heating system, which is a further improvement on the heating system provided in Embodiment 1. In order to meet the heating needs in winter, it can also supply domestic hot water when heating equipment is not needed, thereby improving the application scope and efficiency of the heating system.

[0077] In this embodiment, the buffer water tank 4 is provided with an external water inlet for connecting external water-using equipment; the outlet of the heat pump unit 3 is connected to the inlet of the buffer water tank 4 by a heat pump heating pipe 28, and a first control valve 29 is provided on the heat pump heating pipe 28 to control the on / off state of the heat pump heating pipe 28.

[0078] In this configuration, when indoor heating is not required, the third switch valve 18 on each radiator 1 is disconnected, and the first control valve 29 is opened. The buffer water tank 4 is connected in series with the heat pump unit 3 to form a heating cycle. Water in the buffer water tank 4 flows into the heat pump unit 3, is heated by the heat pump unit 3, and then returns to the buffer water tank 4, thus heating the water in the buffer water tank 4. The external water inlet in the buffer water tank 4 can be connected to the domestic water pipeline to supply hot water to water-using equipment.

[0079] Preferably, the inlet of the buffer water tank 4 is connected to the hot water supply pipe 14 via the heat pump heating pipe 28 between the buffer water tank 4 and the hot water supply pipe 14, so as to shorten the length of the heat pump heating pipe 28, simplify the pipeline layout of the heating system, and reduce the cost of the heating system.

[0080] Furthermore, a bypass return pipe 30 connects the outlet of the buffer water tank 4 to the inlet of the solar collector 2. The bypass return pipe 30 is equipped with a bypass circulation pump 32 and a second control valve 31 that controls the opening and closing of the bypass return pipe 30. When indoor heating is not required, the third switch valve 18 on each radiator 1 is disconnected, the bypass control valve 6 is disconnected, and the solar collector 2 and buffer water tank 4 are directly connected in series through pipelines. Water flowing out of the buffer water tank 4 can flow through the solar collector 2 to be heated and then flow back into the buffer water tank 4, thus enabling the solar collector 2 to heat the water in the buffer water tank 4. The heated water can be used for domestic water use.

[0081] Preferably, the bottom of the buffer water tank 4 is provided with a first water outlet and a second water outlet. The first water outlet is connected to the water tank outlet pipe 13, and the second water outlet is connected to the cold return water pipe 11 via a bypass return water pipe 30. This arrangement can shorten the length of the bypass return water pipe 30, thereby simplifying the piping layout of the entire heating system and reducing the cost of the heating system.

[0082] The installation of the heat pump heating pipe 28 and the bypass return water pipe 30 allows the heat pump unit 3 and the solar collector 2 to be connected in parallel, and can simultaneously heat the water in the buffer water tank 4, improving heating efficiency and effectively meeting the demand for hot water in domestic water use.

[0083] Example 3

[0084] This embodiment provides a control method for a heating system, which uses the heating system in Embodiment 1 or Embodiment 2. The control method includes the following steps:

[0085] When the first heating cycle is running, if the set opening conditions are met, the switching unit will connect the second heating cycle and disconnect the first heating cycle.

[0086] When the second heating circulation loop is running, if the set shutdown conditions are met, the switching unit will connect the second heating circulation loop and disconnect the first heating circulation loop.

[0087] Preferably, the opening conditions are set as follows: the water temperature in the water tank inside the solar collector 2 is greater than or equal to a first temperature value, and / or the temperature difference between the water temperature in the water tank inside the solar collector 2 and the water temperature at the inlet of the solar collector 2 is greater than or equal to a first temperature difference value.

[0088] The shutdown condition is set as follows: the water temperature in the water tank inside the solar collector 2 is less than or equal to the second temperature value, or the temperature difference between the water temperature in the water tank inside the solar collector 2 and the water temperature at the inlet of the solar collector 2 is less than or equal to the second temperature difference value.

[0089] The difference between the first and second temperature values ​​is ≥5℃, and the difference between the first and second temperature values ​​is ≥3℃.

[0090] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A heating system, characterized in that, The heating system includes heating equipment, solar collector (2) and heat pump unit (3). The heating equipment, solar collector (2) and heat pump unit (3) are connected in series to form a first heating circulation loop. The heating equipment and heat pump unit (3) are connected to form a second heating circulation loop that is not connected to the solar collector (2). The heating system also includes a switching unit that can switch between the first heating circulation loop and the second heating circulation loop. The heating equipment, the solar collector (2), and the heat pump unit (3) are connected in series along the medium flow direction to form the first heating circulation loop. A bypass pipe (27) is provided between the outlet of the heating equipment and the inlet of the heat pump unit (3). The switching unit includes a bypass control valve (6) provided on the bypass pipe (27). The bypass control valve (6) is used to control the opening and closing of the bypass pipe (27). A buffer tank (4) is connected in series on the connecting pipe between the inlet of the heat pump unit (3) and the outlet of the solar collector (2). The inlet of the buffer tank (4) is higher than the outlet of the buffer tank (4). The buffer tank (4) is configured to ensure the smooth flow of fluid in the circulation pipeline. The heating system also includes a first temperature detection device and a second temperature detection device. The first temperature detection device is used to detect the water temperature in the water tank inside the solar collector (2), and the second temperature detection device is used to detect the water temperature flowing into the solar collector (2). The bypass control valve (6) is set to close under the following conditions: the water temperature detected by the first temperature detection device is greater than the first temperature value and the temperature difference detected by the first temperature detection device and the second temperature detection device is greater than or equal to the first temperature difference value; the bypass control valve (6) is set to open under the following conditions: the water temperature detected by the first temperature detection device is less than the second temperature value or the temperature difference detected by the first temperature detection device and the second temperature detection device is less than or equal to the second temperature difference value, wherein the first temperature value is greater than the second temperature value and the first temperature difference value is greater than the second temperature difference value.

2. The heating system according to claim 1, characterized in that, The buffer water tank (4) is provided with an external water inlet, which is used to connect external water-using equipment; The outlet of the heat pump unit (3) is connected to the inlet of the buffer water tank (4) by a heat pump heating pipe (28), and a first control valve (29) is provided on the heat pump heating pipe (28) to control the opening and closing of the heat pump heating pipe (28); and / or A bypass return water pipe (30) is connected between the outlet of the buffer water tank (4) and the inlet of the solar collector (2). A bypass circulation pump (32) and a second control valve (31) for controlling the opening and closing of the bypass return water pipe (30) are provided on the bypass return water pipe (30).

3. The heating system according to claim 2, characterized in that, The solar collector (2) is equipped with a first water level gauge, which is used to detect the water level in the water tank inside the solar collector (2). The buffer water tank (4) is connected to a water supply pipe (15), which supplies water to the buffer water tank (4) according to the detection value of the first water level gauge; and / or The buffer tank (4) is equipped with a second water level gauge, which is used to detect the water level in the buffer tank (4). The buffer tank (4) is connected to a water supply pipe (15), which supplies water to the buffer tank (4) according to the detection value of the second water level gauge.

4. The heating system according to claim 2, characterized in that, An electric heater (25) is installed inside the buffer water tank (4).

5. The heating system according to claim 1, characterized in that, The heating system also includes: Total heat meter (7), said total heat meter (7) is used to detect the heat energy consumed by water flowing through said heating equipment; and / or The heat distribution meter (8) is used to detect the increase in heat energy after water flows through the heat pump unit (3).

6. A control method for a heating system, characterized in that, Using the heating system as described in any one of claims 1-5, and the control method comprising the steps of: When the first heating circulation loop is running, if the set opening conditions are met, the switching unit connects the second heating circulation loop and disconnects the first heating circulation loop. When the second heating circulation loop is running, if the set shutdown conditions are met, the switching unit connects the first heating circulation loop and disconnects the second heating circulation loop.

7. The control method according to claim 6, characterized in that, The set shut-off condition is: the water temperature in the water tank inside the solar collector (2) is greater than or equal to the first temperature value, and / or the temperature difference between the water temperature in the water tank inside the solar collector (2) and the water temperature at the inlet of the solar collector (2) is greater than or equal to the first temperature difference value. The set opening condition is: the water temperature in the water tank inside the solar collector (2) is less than or equal to the second temperature value, or the temperature difference between the water temperature in the water tank inside the solar collector (2) and the water temperature at the inlet of the solar collector (2) is less than or equal to the second temperature difference value. The first temperature value minus the second temperature value is ≥5℃, and the first temperature difference value minus the second temperature difference value is ≥3℃.

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