Hot water control method and system based on energy efficiency optimization

Abstract

The present application relates to hot water control technical field, disclose a kind of hot water control method and system based on energy efficiency optimization, comprising the following steps: tap water enters the pipe of hot water control system based on energy efficiency optimization, municipal static pressure drives pipe water flow circulation and supplies water to user end;The water temperature data of each temperature sensor is obtained to determine water state;When there is no water, according to solar collector temperature to execute first heating cycle, or according to water tank temperature to execute second heating cycle or cold water prevention cycle;When there is water, according to the temperature control of heat storage water tank water pump start-stop, tap water sends hot water in water tank to user end.The present application uses municipal static pressure as water outlet power, eliminates water booster pump, reduces operating energy consumption;Through closed pressure tank group setting, reduce hot and cold water mixing, maintain temperature stratification;Through reasonable shunt backwater, preferentially call solar heating, control heat pump start frequency.

Description

Technical Field

[0001] This invention relates to the field of hot water control technology, specifically to a hot water control method and system based on energy efficiency optimization. Background Technology

[0002] In existing technologies, centralized hot water systems typically use open, non-pressurized water tanks as heat storage containers. In this structure, to overcome pipe network resistance and meet the water pressure requirements at the user's end, a booster pump must be added to the water supply pipeline. Each time a user opens the valve to use water, the booster pump needs to be pressurized, resulting in high energy consumption for the pumps during daily water supply operations.

[0003] Meanwhile, when existing water storage equipment replenishes tap water or replaces water flow within the pipe network, the newly injected cold water often mixes directly with the existing hot water due to the limitations of its internal structure and the volume of a single water tank. This mixing disturbance disrupts the natural temperature stratification of the water, causing the overall water temperature in the tank to drop too quickly, reducing the proportion of high-quality hot water that the system can stably output.

[0004] Furthermore, to prevent the water temperature at the front end of the pipeline from dropping and causing cold water to be released at the user's end, hot water systems typically implement anti-cold water circulation. However, existing control methods usually directly introduce all the low-temperature return water drawn back from the end into the main heating water tank. This water circulation method lowers the water temperature in the main heating zone, causing the air source heat pump inside the system to start frequently and passively. In scenarios where multiple heat sources operate in tandem, due to the lack of diversion control of the return water path and the lack of temperature difference coordination logic for the start-up and shutdown of solar energy and heat pumps, the direct impact of cold return water increases the frequency of ineffective start-up and shutdown of auxiliary heat sources and the overall heating energy consumption. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a hot water control method and system based on energy efficiency optimization, which solves the problems of high energy consumption of water supply pumps, low efficiency of multi-heat source coordinated operation, and easy disturbance of system temperature hierarchy by terminal anti-cold water circulation in existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a hot water control method based on energy efficiency optimization, comprising the following steps: Tap water enters the hot water control system through the tap water replenishment equipment, and uses municipal static pressure to drive the water flow to circulate and supply water to the end user. Obtain water temperature data from each temperature sensor within the pipeline of the hot water control system to determine the water usage status at the user's end. When there is no water usage, the first heating cycle is executed based on the temperature of the first solar collector, the second solar collector, and the third solar collector, or the second heating cycle or the anti-cold water cycle is executed based on the temperature of the heating water tank and the sixth hot water storage tank. When water is used, the water pump is started and stopped according to the temperature of the sixth hot water storage tank, and the tap water is pressurized to send hot water from the first and fourth hot water storage tanks to the user's terminal.

[0007] A second aspect of the present invention provides a hot water control system based on energy efficiency optimization, comprising: a hot water storage tank group, consisting of a heating water tank, a first hot water storage tank, a second hot water storage tank, a third hot water storage tank, a fourth hot water storage tank, a fifth hot water storage tank, and a sixth hot water storage tank, wherein the inner liner of all tanks is a closed pressure structure with the internal space not communicating with the atmosphere; an air source heat pump host, connected to the heating water tank through a host-side circulation pump; and a first solar collector, a second solar collector, and a third solar collector, connected to the heating water tank through a solar circulation pump.

[0008] Furthermore, the piping and power drive components of the system include: A water pump and an electric two-way valve are installed on the main pipeline connecting the heating water tank and the first and fourth hot water storage tanks. The end return water pump is installed in the return water branch of the main water supply line near the user end, and the output end of the end return water pump is connected to the third hot water storage tank and the sixth hot water storage tank. The tap water replenishment equipment connects the municipal tap water network to the closed-loop network of the energy-efficient hot water control system via pipelines, and is directly connected to the inlet pipes of the third and sixth hot water storage tanks; the expansion tank is connected in parallel to the main flow channel of the closed-loop network of the hot water control system.

[0009] Furthermore, the temperature detection component of the system includes: The first and second temperature sensors are installed inside the heating water tank; The third temperature sensor is installed on the first hot water storage tank; The fourth temperature sensor is installed on the fourth hot water storage tank; The fifth temperature sensor is installed on the main pipeline near the user's end; The sixth temperature sensor is installed on the main outlet pipe of the solar collector circulation system; The seventh, eighth, and ninth temperature sensors are installed at the first, second, and third solar collectors, respectively. The tenth temperature sensor is installed on the main inlet pipe of the solar collector circulation system; The eleventh temperature sensor is located inside the sixth hot water storage tank; The inlet of the solar collector is connected to the third and sixth hot water storage tanks, and the outlet is connected to the heating water tank.

[0010] This invention provides a hot water control method and system based on energy efficiency optimization, which has the following beneficial effects: This invention employs an energy-efficient optimized hot water control system pipeline connected to municipal water supply equipment. When a user has a water demand, the static pressure of the municipal water supply network is used as the driving force to propel the water flow within the system to supply water to the user. This structure eliminates the need for a booster pump required in traditional open hot water systems, directly reducing the energy consumption of the pumps during the water supply process.

[0011] This invention constructs a hot water storage tank group consisting of multiple closed pressurized water tanks connected in series and parallel, and incorporates a structure with a long inlet pipe and a short outlet pipe inside the heating water tank. During system water replenishment and pipeline water flow replacement, cold water enters from the bottom and pushes the high-temperature water at the top towards the rear, reducing the mixing disturbance between the newly injected cold water and the existing high-temperature water. This maintains temperature stratification within the tank group as a whole and within individual tanks, thereby increasing the proportion of high-grade hot water output in the system.

[0012] This invention acquires system water temperature data through temperature sensors installed at each pipeline node, establishing a collaborative control logic for solar thermal collection circulation, heat pump auxiliary heating, and anti-cold water circulation. The system prioritizes solar energy for water circulation heating based on sensor temperature differences. During anti-cold water circulation, the return water is divided into two paths through a return water branch node. While pressurizing the cold water back into the system for reheating, the amount of return water directly entering the heating tank is limited, preventing cold return water from lowering the main heating zone water temperature, thus effectively controlling the passive start frequency of the air source heat pump. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system functional architecture according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the operation flow of the hot water control method according to an embodiment of the present invention; Figure 3 This is a schematic diagram comparing the fluctuations in the terminal water supply pressure according to an embodiment of the present invention; Figure 4 This is a two-dimensional polygonal line diagram illustrating the overall energy efficiency COP response of an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the power consumption trend of the water pump system according to an embodiment of the present invention.

[0014] Explanation of icon numbers: 1. Air source heat pump unit; 2. Heating water tank; 3. First hot water storage tank; 4. Second hot water storage tank; 5. Third hot water storage tank; 6. Fourth hot water storage tank; 7. Fifth hot water storage tank; 8. Sixth hot water storage tank; 9. First solar collector; 10. Second solar collector; 11. Third solar collector; 12. Main unit side circulation pump; 13. Water transfer pump; 14. Solar circulation pump; 15. Terminal return water pump; 16. Expansion tank; 17. User terminal; 18. Electric two-way valve; 19. Tap water replenishment equipment; 20. First temperature sensor; 21. Second temperature sensor; 22. Third temperature sensor; 23. Fourth temperature sensor; 24. Fifth temperature sensor; 25. Sixth temperature sensor; 26. Seventh temperature sensor; 27. Eighth temperature sensor; 28. Ninth temperature sensor; 29. ​​Tenth temperature sensor; 30. Eleventh temperature sensor. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1 This invention provides a hot water control system based on energy efficiency optimization. The system includes: an air source heat pump unit 1 connected to a heating water tank 2 via a unit-side circulation pump 12 through a pipeline, forming a heat source heating circuit. A first solar collector 9, a second solar collector 10, and a third solar collector 11 are connected in parallel or series through pipelines to form a solar collector array, and are connected to the heating water tank 2 through a solar circulation pump 14, forming a solar-thermal conversion input circuit.

[0017] The rear end of the heating water tank 2 is connected sequentially to the first hot water storage tank 3, the second hot water storage tank 4, the third hot water storage tank 5, the fourth hot water storage tank 6, the fifth hot water storage tank 7, and the sixth hot water storage tank 8 via pipelines, forming a multi-stage series-parallel modular hot water storage tank array. The first hot water storage tank 3 to the sixth hot water storage tank 8 form a continuous heat storage channel through internal flow channel design. The water pump 13 and the electric two-way valve 18 are installed on the main connecting pipeline between the heating water tank 2 and the subsequent hot water storage tank array, and are used to control the flow of water between the heating water tank 2 and the first hot water storage tank 3 and the fourth hot water storage tank 6.

[0018] One end of the main water supply pipeline is connected to the water-using equipment at user terminal 17. The terminal return pump 15 is located in the return branch of the main pipeline near user terminal 17, and its output is connected to the third hot water storage tank 5 and the sixth hot water storage tank 8 via pipelines. The tap water replenishment device 19 is connected to the system network through a replenishment pipeline, allowing tap water to directly enter the system. The overall system structure is a closed system, where the water flow within the pipeline system does not come into contact with external air. The internal pressure of the system during operation is the same as the tap water pressure input to the tap water replenishment device 19. The water pressure of the tap water network provides the fluid power for the water circulation of the entire hot water system and for the water output to user terminal 17, creating a fluid dynamic configuration where cold and hot water originate from the same source. An expansion tank 16 is located at a node within the pipeline network to absorb the volume expansion caused by changes in system water temperature, maintaining stable pressure in the pipeline system.

[0019] Temperature sensors 20 through 11 (the first to eleventh temperature sensors 30) are distributed at the main thermodynamic nodes of the system. Temperature sensor 20 and temperature sensor 21 are installed inside the heating water tank 2 to monitor the water temperature. Temperature sensors 26, 27, and 28 are installed at the first solar collector 9, second solar collector 10, and third solar collector 11, respectively. Specifically, temperature sensors 26, 27, and 28 are respectively located at the outlet ends of the first, second, and third solar collectors, specifically at the hot water outlet branch pipe / outlet manifold of each solar collector, preferably near the connection point between the collector outlet and the solar water outlet manifold, or on the manifold connected to the outlet, to detect the outlet water temperature of the corresponding solar collector after solar heating. Temperature sensor 30 is installed inside the sixth hot water storage tank 8. The fifth temperature sensor 24 is installed on the main pipeline near the user terminal 17. The third temperature sensor 22, the fourth temperature sensor 23, the sixth temperature sensor 25, and the tenth temperature sensor 29 are configured at the temperature measurement nodes of the remaining modular hot water storage tanks or connecting pipelines in the system to obtain real-time water temperature data for each section of the pipeline network. The data output terminals of each temperature sensor are connected to the system's control logic unit.

[0020] like Figure 2 As shown in the figure, this embodiment of the invention provides a hot water control method based on energy efficiency optimization, which includes the following steps: Tap water enters the system pipeline after passing through the tap water replenishment device 19. The water pressure in the system is consistent with the input pressure of the tap water network. The system receives the set target maintenance temperature. The system obtains water temperature data at each node of the network through various temperature sensors to determine the water usage status at the user terminal 17.

[0021] When there is no water usage at user terminal 17, the system executes a first heating cycle, a second heating cycle, or an anti-cold water cycle. In the first heating cycle, the system reads temperature data from the seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28. When the detected temperatures of all the above sensors reach a preset first threshold, the system starts the solar circulation pump 14. Hot water from the first solar collector 9, the second solar collector 10, and the third solar collector 11 flows to the heating tank 2. Water flows from the heating tank 2 into the first hot water storage tank 3 and the fourth hot water storage tank 6, and then sequentially into the subsequent hot water storage tanks. Water in the third hot water storage tank 5 and the sixth hot water storage tank 8 flows back to the first solar collector 9, the second solar collector 10, and the third solar collector 11. When the eleventh temperature sensor 30 detects that the water temperature in the sixth hot water storage tank 8 reaches a preset second threshold, the system stops the solar circulation pump 14. The first threshold is greater than the second threshold to ensure that the output temperature of the solar collectors is higher than the temperature of the hot water storage tanks.

[0022] In the second heating cycle, the air source heat pump unit 1 is in operation. When the first temperature sensor 20 detects that the temperature of the heating water tank 2 has reached a preset third threshold, and the eleventh temperature sensor 30 detects that the temperature in the sixth hot water storage tank 8 is lower than a preset fourth threshold, the system activates the water pump 13 and the electric two-way valve 18. Water in the heating water tank 2 flows into the first hot water storage tank 3 and the fourth hot water storage tank 6, and then flows sequentially to the subsequent hot water storage tanks. Water in the third hot water storage tank 5 and the sixth hot water storage tank 8 flows back to the heating water tank 2. When the eleventh temperature sensor 30 detects that the temperature in the sixth hot water storage tank 8 is higher than a preset fifth threshold, the system stops the water pump 13. When the second temperature sensor 21 detects that the temperature in the heating water tank 2 has reached the set target maintenance temperature, i.e., the eighth threshold, the system stops the air source heat pump unit 1. The fourth threshold is less than the fifth threshold, and the third threshold is less than the eighth threshold.

[0023] In the anti-cold water circulation, when the fifth temperature sensor 24 detects that the temperature at the end of the main pipe is lower than the preset sixth threshold, the system starts the end return water pump 15. Water in the end main pipe flows into the third hot water storage tank 5 and the sixth hot water storage tank 8. The water flows sequentially from the third hot water storage tank 5 and the sixth hot water storage tank 8 to the second hot water storage tank 4 and the fifth hot water storage tank 7, and then to the first hot water storage tank 3 and the fourth hot water storage tank 6. Water in the first hot water storage tank 3 and the fourth hot water storage tank 6 flows into the end main pipe. When the temperature detected by the fifth temperature sensor 24 reaches the preset seventh threshold, the system stops the end return water pump 15. The aforementioned sixth threshold is less than the seventh threshold.

[0024] When the system simultaneously executes the second heating cycle and the anti-cold water cycle, the water in the terminal main pipe is divided into two paths. The first path of water flows back to the heating water tank 2 via the water pump 13, while the second path of water flows into the third hot water storage tank 5 and the sixth hot water storage tank 8 to participate in the water circulation between the tanks.

[0025] When water is used at user terminal 17, hot water from heating tank 2 and the first hot water storage tank 3 flows through pipes to the water-using equipment at user terminal 17. Tap water is replenished into the system through tap water replenishment device 19. The system performs tap water flow control based on data from the eleventh temperature sensor 30. When the eleventh temperature sensor 30 detects that the temperature in the sixth hot water storage tank 8 is higher than the preset fifth threshold, the system controls the water pump 13 to stop. Tap water entering the system through tap water replenishment device 19 flows into the sixth hot water storage tank 8 and the third hot water storage tank 5. This portion of water pushes the hot water in the first hot water storage tank 3 and the fourth hot water storage tank 6 towards user terminal 17. When the eleventh temperature sensor 30 detects that the temperature in the sixth hot water storage tank 8 is lower than the preset fifth threshold, the system starts the water pump 13. The tap water entering the system through tap water replenishment device 19 is divided into two parts. The first part of the tap water flows into the sixth hot water storage tank 8 and the third hot water storage tank 5, pushing the hot water in the first hot water storage tank 3 and the fourth hot water storage tank 6 towards user terminal 17. The second portion of tap water enters the heating water tank 2 via the water pump 13. The high-temperature water at the top of the heating water tank 2 is output to the user terminal 17. When the second temperature sensor 21 detects that the temperature inside the heating water tank 2 has reached the preset third threshold, the system starts the air source heat pump unit 1 to heat the water.

[0026] The photothermal conversion and dual-heat-source coupling physical structure of the energy-efficient optimized hot water control system provided in this embodiment of the invention includes a solar collector array circuit and a heat pump heating circuit. A first solar collector 9, a second solar collector 10, and a third solar collector 11 are connected in parallel via pipelines to form a solar collector array. The main inlet pipe of the collector array is connected to the outlet of the third hot water storage tank 5 and the sixth hot water storage tank 8. The main outlet pipe of the collector array is connected to the inlet of the solar circulation pump 14. The outlet of the solar circulation pump 14 is connected to the heating water tank 2 via a main pipe.

[0027] The solar collector contains a metal absorber and a pressurized fluid channel. Solar radiation passes through the outer transparent cover and shines on the metal absorber, which absorbs the short-wave solar radiation and converts it into heat energy, which is then conducted to the water in the fluid channel.

[0028] The photothermal conversion process of a solar collector array follows the thermodynamic transient efficiency criterion. The calculation method is as follows: ; In the formula, This represents the maximum optical efficiency of the solar collector. This is the first-order heat loss coefficient of the solar collector; This is the second-order heat loss coefficient of the solar collector; The average temperature of the water flowing inside the solar collector; The external ambient temperature of the system; The solar irradiance received on the light-receiving surface of the solar collector.

[0029] Photothermal conversion effective heat power output by the heat collection array The calculation method is as follows: ; In the formula, The total light-collecting area of ​​the solar thermal collector array; This is the correction factor for the solar incidence angle.

[0030] The seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28 are respectively fixedly installed on the metal outlet manifold wall of the first solar collector 9, the second solar collector 10, and the third solar collector 11. The sensor probes exchange heat with the internal water flow to obtain the water temperature data after photothermal conversion and transmit it to the system control terminal. The water inlet port of the air source heat pump host 1 is connected to the water outlet port of the host-side circulation pump 12 through a metal pipe. The water inlet port of the host-side circulation pump 12 is connected to the bottom outlet flange of the heating water tank 2 through a pipe. The water outlet port of the air source heat pump host 1 is connected to the upper inlet flange of the heating water tank 2 through a pipe. This pipeline connection configuration forms a closed heat pump heating circuit. For the specific selection of the compressor, evaporator, and condenser inside the air source heat pump host 1 and the refrigerant phase change cycle principle, those skilled in the art can refer to conventional heat pump design manuals for configuration. Its internal heating principle is well-known technology in this field and will not be described in detail here.

[0031] The solar collector array circuit and the heat pump heating circuit share the heating water tank 2 as a heat energy collection node. The solar collector array circuit relies on the solar circulation pump 14 to inject the heated water, which has absorbed solar energy, into the heating water tank 2. The heat pump heating circuit relies on the main unit-side circulation pump 12 to draw the low-temperature water from the bottom of the heating water tank 2 to the air source heat pump main unit 1 for secondary compensation heating. The two heating methods achieve heat transfer and physical coupling within the internal volume of the heating water tank 2, jointly providing a high-temperature heat source for the hot water storage tank at the back end of the system.

[0032] The system provided in this embodiment of the invention includes a modular pressurized hot water storage tank array. This array consists of a heating water tank 2, a first hot water storage tank 3, a second hot water storage tank 4, a third hot water storage tank 5, a fourth hot water storage tank 6, a fifth hot water storage tank 7, and a sixth hot water storage tank 8. All tanks have a closed, pressurized inner liner, with the internal space not connected to the atmosphere, to continuously withstand the static water pressure introduced from the municipal water supply equipment 19. The main outlet pipe of the heating water tank 2 branches into two parallel fluid branches at its rear end. The first fluid branch connects the first hot water storage tank 3, the second hot water storage tank 4, and the third hot water storage tank 5 in series. The second fluid branch connects the fourth hot water storage tank 6, the fifth hot water storage tank 7, and the sixth hot water storage tank 8 in series. The top outlet port of the preceding hot water storage tank is connected to the bottom inlet port of the following hot water storage tank via a metal pressurized pipe, thus forming two sets of parallel continuous heat storage channels. Water flows unidirectionally within the multi-stage hot water storage tanks using a physical flow propulsion method.

[0033] The heating water tank 2 has an internal thermodynamic stratification structure. This stratification is specifically manifested in long and short conduits fixedly installed inside the heating water tank 2. The top of the long conduit connects to the external inlet flange of the heating water tank 2, and the bottom of the long conduit extends axially downwards along the tank to near the bottom of the inner liner of the heating water tank 2. The top of the short conduit connects to the external outlet flange of the heating water tank 2, and the bottom of the short conduit is located at the top of the inner liner of the heating water tank 2. When low-temperature circulating water enters the heating water tank 2, it is directly guided to the bottom of the tank due to the flow channel constraint of the long conduit. The high-temperature water, having absorbed heat, has a lower fluid density and, under buoyancy, gathers at the top of the tank and exits through the short conduit. The physical spatial difference between the long and short conduits isolates the direct collision between the inlet and outlet water flows, suppresses disturbance to the high-temperature water at the top of the tank when cold water is injected, and prevents the mixing of cold and hot water. The thermodynamic stratification of water temperature along the height direction inside the heating water tank 2 follows the one-dimensional energy conservation principle of fluids. Specifically, the interior of the heating water tank 2 is divided into multiple fluid control layers along its height. For any given water layer, the rate of change of its internal water thermal energy over time is equal to the algebraic sum of the heat transfer from three parts. The first part is the convective heat transfer brought about by the fluid mass flow rate entering and leaving the water layer, i.e., the difference between the enthalpy of the inflow and the enthalpy of the outflow. The second part is the heat transfer between this water layer and the adjacent upper and lower water layers, based on the thermal conductivity of the water itself along the axial height difference. The third part is the effective heating power directly input to this water layer by an external heat source. Through the above energy balance relationship, a stable temperature gradient with a high temperature at the top and a low temperature at the bottom is formed inside the heating water tank 2.

[0034] The first temperature sensor 20 is installed in the lower space of the inner tank of the heating water tank 2, near the bottom outlet of the long conduit. The second temperature sensor 21 is installed in the upper space of the inner tank of the heating water tank 2, near the internal inlet of the short conduit. The first temperature sensor 20 acquires data from the low-temperature zone at the bottom of the water tank, and the second temperature sensor 21 acquires data from the high-temperature zone at the top of the water tank. The system control unit receives the temperature data from the two sensors and obtains the axial temperature gradient inside the heating water tank 2, thereby determining the specific boundary of the hot and cold water stratification state inside the heating water tank 2.

[0035] The energy-efficient optimized hot water control system provided in this embodiment of the invention is equipped with a multi-dimensional temperature sensing network distributed throughout thermodynamic nodes and a constant-pressure water supply network for power drive. The first temperature sensor 20 to the eleventh temperature sensor 30 deployed within the system together constitute the multi-dimensional temperature sensing network. The first temperature sensor 20 and the second temperature sensor 21 are used to acquire the upper and lower water temperatures within the heating water tank 2. The seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28 are used to acquire the photothermal conversion outlet water temperature of the three sets of solar collectors. The fifth temperature sensor 24 is installed on the main water supply pipe near the user terminal 17. Specifically, it acquires the real-time temperature of the fluid inside the main water supply pipe through a pipe-wall patch-type thermistor or a probe insertion structure. The data from this sensor is used to determine whether the terminal pipe has experienced heat loss due to prolonged lack of water use, providing a data basis for the system to trigger anti-cold water circulation.

[0036] The eleventh temperature sensor 30 is installed inside the sixth hot water storage tank 8. The system uses this sensor to obtain the water temperature boundary value at the very end of the thermal storage array, thereby assessing whether the total heat storage capacity of the entire modular pressurized hot water storage tank array has reached saturation. The third temperature sensor 22, the fourth temperature sensor 23, the sixth temperature sensor 25, and the tenth temperature sensor 29 are sequentially distributed within the inner tanks or connecting pipes of the remaining levels of hot water storage tanks. All the above temperature sensors transmit the detected analog or digital temperature signals to the control unit in real time, enabling the system to accurately acquire the dynamic movement of the physical interface between cold and hot water in each section of the pipe network and inside each tank. The core components of the constant pressure water supply network are the municipal water supply device 19 and the expansion tank 16. The municipal water supply device 19 connects to the closed-loop pressurized system via a pipeline. That is, the inlet of the municipal water supply device 19 is connected to the municipal water supply network via a pipeline, and the outlet is connected to the closed-loop pressurized system network of the hot water control system via a pipeline. The tap water replenishment device 19 may also be equipped with a check valve to prevent backflow of hot water from the hot water control system. This check valve is a physical combination of a one-way check valve and a pressure regulating valve. The one-way check valve allows municipal tap water to flow unidirectionally into the hot water control system while preventing the hot water inside the hot water control system from physically flowing back into the municipal water network due to pressure fluctuations. Tap water is directly injected into the bottom inlet pipes of the third and sixth hot water storage tanks 5 and 8 through the tap water replenishment device 19.

[0037] The pipeline system in this embodiment of the invention is a fully enclosed structure. According to Pascal's law and the fluid continuity equation in fluid mechanics, the input static pressure of the municipal water supply network serves as the driving force for the unidirectional circulation of water within the entire system and for supplying water to the user terminal 17. The overall fluid pressure within the system network maintains a dynamic balance with the input pressure of the municipal water supply replenishment device 19. When the water-using equipment at the user terminal 17 is turned on, a pressure drop occurs in the network, and the municipal water supply replenishment device 19, under the action of the pressure difference, replenishes an equal volume of low-temperature municipal water into the system. The replenished municipal water creates a physical thrust in the downstream hot water storage tank, overcoming the frictional and local resistance of the pipeline, pushing the high-temperature hot water in the frontmost heating water tank 2 and the first hot water storage tank 3 to the user terminal 17. This dynamic structure replaces the booster pump required for traditional open systems to supply water to the terminal.

[0038] Specifically, the expansion tank 16 is connected in parallel to the main flow channel of the hot water control system network to absorb the fluid volume expansion caused by changes in system water temperature and maintain the pressure stability of the hot water control system. The expansion tank 16 has a flexible air bladder pre-filled with inert gas. When the pressure in the network increases, the expanding fluid enters the expansion tank 16 and compresses the flexible air bladder; when the pressure in the network decreases, the flexible air bladder expands, pushing the fluid stored inside back into the network. In practice, the expansion tank 16 is connected in parallel to the main flow channel of the closed-loop network via a T-junction. When the cold water in the hot water control system network absorbs heat transferred from the solar collector array or the air source heat pump unit 1, the specific volume of the water increases due to the thermal expansion and contraction properties of the fluid. Inside the closed-loop network with a constant volume, the expansion of the fluid volume directly translates into an increase in internal pressure. The expansion tank 16 has a flexible air bladder pre-filled with inert gas. When the water pressure in the pipeline increases, the expanding water enters the expansion tank 16 and compresses the flexible air bladder, thus absorbing the increased water volume. When the water temperature in the pipeline drops or the pressure in the pipeline decreases due to water being released from the end, the air bladder releases the water stored inside back into the main pipeline under the action of gas expansion force, maintaining the pressure stability of the closed system.

[0039] The energy-efficient optimized hot water control system provided in this embodiment of the invention executes a Boolean logic-based solar thermal collector cycle control strategy when there is no water usage at user terminal 17, prioritizing the use of energy obtained through solar thermal conversion. The system control unit determines whether there is water usage at user terminal 17 by monitoring the water flow status parameters of the main pipeline at the terminal. When it is confirmed that there is no water usage at user terminal 17, the system's operating logic switches to pipeline heat storage. The system control unit reads the temperature signals from the seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28 in real time. These three sensors are used to obtain the working fluid temperature inside the first solar collector 9, the second solar collector 10, and the third solar collector 11 after being heated by shortwave solar radiation. The start and stop of the solar thermal collector cycle are controlled by the system's underlying logic formula, and its specific control logic model is as follows: ; In the formula, This is the operating status parameter of the solar circulating pump 14. When the parameter value is 1, it means that the control unit outputs the drive voltage to close the water pump relay. When the parameter value is 0, it means that the control unit disconnects the water pump relay. This represents the triggering condition in a logical expression; A mathematical function to find the minimum value; The temperature detected by the seventh temperature sensor 26; The temperature detected by the eighth temperature sensor 27; The temperature detected by the ninth temperature sensor 28; The preset start-up temperature threshold for the solar circulation pump 14 is the first threshold defined by the system. The physical water temperature inside the sixth hot water storage tank 8 detected by the eleventh temperature sensor 30; Maintain the temperature to the preset target of the entire system, which is the second threshold defined by the system.

[0040] When the system detects that the temperatures detected by the sensors of the three solar collectors have all reached or exceeded the preset first threshold, the control logic determines that the cumulative amount of photothermal conversion of the solar collector array meets the trigger condition. The control unit sends an operating command to the solar circulation pump 14. The impeller of the solar circulation pump 14 rotates to generate fluid dynamic pressure, driving the high-temperature fluid inside the first solar collector 9, the second solar collector 10, and the third solar collector 11 into the main circulation network, flowing towards the heating water tank 2. The high-temperature water flows into the heating water tank 2 and mixes with the water stored in the heating water tank 2. The water flow is output from the main outlet pipe of the heating water tank 2 and is divided into two physical branches. The water flow of the first branch enters the first hot water storage tank 3, and the water flow of the second branch enters the fourth hot water storage tank 6. Under the action of the continuous circulation head provided by the solar circulation pump 14, the fluid undergoes unidirectional thrust flow in the two sets of parallel modular hot water storage tank arrays. The water flow carries heat sequentially to the second and fifth hot water storage tanks 4 and 7, and finally reaches the third and sixth hot water storage tanks 5 and 8 at the end of the array. The low-temperature water displaced at the bottom of the third and sixth hot water storage tanks 5 and 8 flows into the return water main of the solar collector array, and re-enters the first solar collector 9, the second solar collector 10, and the third solar collector 11 for photothermal conversion heating. This closed flow path constitutes a complete physical mass and heat cycle.

[0041] During the aforementioned cyclic heating process, the system continuously monitors the saturation level of heat transfer to the terminal water storage nodes. When the eleventh temperature sensor 30 detects that the temperature in the sixth hot water storage tank 8 reaches the preset second threshold, the system logic determines that the total heat storage capacity of the multi-stage hot water storage tank array has met the design requirements. The control unit sends a shutdown command to the solar circulation pump 14. The solar circulation pump 14 stops operating, and the fluid in the pipe network stops circulating due to physical resistance, thus ending the current solar thermal collection process.

[0042] The energy-efficient optimized hot water control system provided in this embodiment of the invention executes a heat pump coupling supplementary cycle control strategy based on dual temperature limit determination when there is no water usage at the user terminal 17 and the solar collector's photothermal conversion energy is insufficient. The system control unit receives detection signals from the first temperature sensor 20 and the eleventh temperature sensor 30 in real time. The first temperature sensor 20 is installed in the lower part of the inner tank of the heating water tank 2 to obtain the basic water temperature status of the heat source convergence node. The eleventh temperature sensor 30 is installed inside the sixth hot water storage tank 8 to characterize the degree of heat storage deficiency at the end of the modular pressurized hot water storage tank array. When the water temperature is lower than the set value, the system puts the air source heat pump host 1 into the heating state, continuously inputting heat into the heating water tank 2. The joint operation state of the water pump 13 and the electric two-way valve 18 is governed by the Boolean logic model inside the system control unit, and its formula is expressed as follows: ; In the formula, This is the operating status parameter for the water pump 13. When the value of this parameter is 1, it means that the control unit outputs a drive level to power on the water pump motor and make it run; when the value is 0, it means that the pump stops when the power is off. This is the opening status parameter for the electric two-way valve 18. When the value of this parameter is 1, it means that the valve actuator drives the valve core to rotate to the flow channel open position; when the value is 0, it means that the valve core resets and cuts off the flow channel. This represents the triggering condition in a logical expression; The real-time temperature detected by the first temperature sensor 20; The preset first opening temperature threshold is the third threshold defined by the system. This is the logical AND operator, indicating that both conditions must be true at the same time; This is the preset second opening temperature threshold, which is the fourth threshold defined by the system. This is the preset stop temperature threshold, which is the fifth threshold defined by the system.

[0043] When the temperature detected by the first temperature sensor 20 reaches the preset third threshold, and the temperature detected by the eleventh temperature sensor 30 is lower than the preset fourth threshold, the control logic determines that the overall heat storage of the pipeline network is insufficient, and that the heating water tank 2 has the basic conditions for external heat transfer. The control unit simultaneously opens the water pump 13 and the electric two-way valve 18. The impeller of the water pump 13 provides mechanical pressure head for the fluid in the pipeline network. The high-temperature fluid inside the heating water tank 2, which absorbs heat from the air source heat pump host 1, flows out through the main pipeline.

[0044] The high-temperature water in the main pipeline flows through the electrically operated two-way valve 18, which is in the conducting state, and enters the modular hot water storage tank array at the rear end. The water flow is physically split at the pipeline nodes, entering the first hot water storage tank 3 and the fourth hot water storage tank 6 respectively. Under the continuous power of the water pump 13, the high-temperature water undergoes a step-by-step pushing within the closed-loop network. The original water in the first and fourth hot water storage tanks 3 and 6 is physically pushed into the second and fifth hot water storage tanks 4 and 7 respectively. This water replacement process continues to propagate to subsequent nodes until the low-temperature water in the third and sixth hot water storage tanks 5 and 8 at the very end of the array is squeezed out of the tanks. This portion of low-temperature water flows back to the bottom space of the heating water tank 2 along the system's return water pipeline, receiving further heat exchange from the air-source heat pump unit 1. This closed-loop fluid circuit constitutes a complete second heating cycle.

[0045] During the second heating cycle, the high-temperature interface within the pipeline network continuously moves towards the sixth hot water storage tank 8. When the eleventh temperature sensor 30 detects that the temperature inside the sixth hot water storage tank 8 has risen and reached the preset fifth threshold, the control logic determines that the heat storage capacity of the multi-stage hot water storage tank array has been effectively replenished. The system control unit outputs a shutdown command, the water pump 13 stops operating, the electric two-way valve 18 closes the flow channel, and the fluid circulation process terminates. After the water pump 13 stops operating, the start and stop of the air source heat pump unit 1 is independently controlled by the top water temperature inside the heating water tank 2, and its logic model is as follows: ; In the formula, This is the operating status parameter of the air source heat pump unit 1. When this parameter value is 0, it indicates that the control unit cuts off the power supply circuit of the compressor inside the unit, stopping heating; This represents the triggering condition in a logical expression; The real-time temperature detected by the second temperature sensor 21; The system maintains a preset target temperature. When the second temperature sensor 21 detects that the water temperature in the space above the heating water tank 2 has reached the set target temperature, the control unit shuts down the air source heat pump unit 1 to prevent the water temperature from rising excessively.

[0046] The energy-efficient hot water control system provided in this embodiment of the invention executes a terminal pipe network anti-cold water circulation control strategy when there is no water usage at the user terminal 17, in order to maintain the temperature of the fluid inside the main water supply pipe and prevent low-temperature water from flowing out when the user turns on the water equipment.

[0047] The system control unit continuously receives temperature data collected by the fifth temperature sensor 24. The fifth temperature sensor 24 is installed on the main water supply pipeline near the user terminal 17 to obtain water temperature changes in the terminal area of ​​the main pipeline. The system triggers corresponding pipeline fluid replacement actions based on the real-time data from this temperature sensor. The start / stop status of the terminal return water pump 15 is governed by the system's built-in anti-cold water logic model, and its control logic formula is: ; In the formula, This is the operating status parameter of the terminal return water pump 15. When the value of this parameter is 1, it means that the control unit closes the power supply circuit of the terminal return water pump 15, and the motor is energized to drive the impeller to rotate; when the value of this parameter is 0, it means that the control unit disconnects the power supply circuit, and the water pump stops. This represents the triggering condition in a logical expression; The real-time temperature detected by the fifth temperature sensor 24; The preset opening temperature threshold for the main pipeline insulation is the sixth threshold defined by the system. The preset stop temperature threshold for the main pipeline insulation is the seventh threshold defined by the system. When the temperature at the end of the main pipeline detected by the fifth temperature sensor 24 drops and reaches the preset sixth threshold, the control logic determines that the stagnant water in the main pipeline has experienced temperature decay due to heat dissipation to the external environment. The system control unit outputs a drive signal to start the end return water pump 15. The end return water pump 15 operates and generates fluid suction in the return water branch at the end of the pipe network.

[0048] Driven by the mechanical power of the return water pump 15, the low-temperature water at the end of the main water supply pipeline flows into the return water pipeline and is transported to the third and sixth hot water storage tanks 5 and 8 at the rear of the hot water storage tank array. The injection of the return water creates hydrostatic pressure within the closed network, causing a physical displacement of the water inside the modular pressurized hot water storage tank array. The water flow sequentially pushes the water from the third and sixth hot water storage tanks 5 and 8 into the second and fifth hot water storage tanks 4 and 7, and continues to push it into the first and fourth hot water storage tanks 3 and 6 at the very front. During the multi-stage water tank flow process, the high-temperature hot water stored inside the first and fourth hot water storage tanks 3 and 6 flows out of the tanks and into the main water supply pipeline. This portion of high-temperature water flows towards the user terminal 17, filling the physical space created at the front of the pipeline due to the return water extraction, thus achieving the displacement of the low-temperature water inside the main pipeline with the high-temperature water inside the tanks.

[0049] As high-temperature water is continuously injected into the main water supply pipeline from the upstream end of the pipeline network, the water temperature at the downstream end of the main pipeline gradually rises. When the water temperature detected by the fifth temperature sensor 24 rises and reaches the preset seventh threshold, the control logic determines that the hot and cold water exchange has been completed inside the main pipeline, and the pipeline network temperature returns to the set requirement. The system control unit issues a command to cut off the power supply to the downstream return water pump 15. Fluid movement within the pipeline network stops, and the system ends the anti-cold water circulation process.

[0050] The energy-efficient optimized hot water control system provided in this embodiment of the invention is equipped with a multi-logic concurrent coordination mechanism under complex operating conditions to solve the problem of physical diversion and coupling operation of water flow in the pipeline network when multiple single control strategies are triggered simultaneously.

[0051] The system control unit processes global data from the multi-dimensional temperature sensor network in real time. When there is no water usage at user terminal 17, and the overall heat storage of the pipe network is insufficient while heat loss occurs in the main water supply pipe, the system simultaneously satisfies the trigger conditions for heat pump coupling replenishment circulation and terminal pipe network anti-cold water circulation. Specifically, the concurrent coordination mechanism built into the system control unit operates based on a combination of three temperature conditions. When the internal temperature of the heating water tank 2 detected by the first temperature sensor 20 reaches a preset third threshold, and the internal temperature of the sixth hot water storage tank 8 detected by the eleventh temperature sensor 30 is lower than a preset fourth threshold, and the terminal temperature of the main water supply pipe detected by the fifth temperature sensor 24 is lower than a preset sixth threshold, the control unit determines that the concurrent conditions are met. At this time, the control unit synchronously outputs a high-level drive signal, causing the water pump 13, the terminal return water pump 15, and the electric two-way valve 18 to be simultaneously open. If any of the above three temperature conditions are not met, the concurrent coordination condition is not triggered.

[0052] Under concurrent and coordinated operation, the closed-loop pipe network simultaneously contains the positive circulation head provided by the guide pump 13 and the return water suction head provided by the terminal return water pump 15. The terminal return water pump 15 draws low-temperature water from the end of the main supply pipe into the return water pipe, forming a total return water flow. At the return water confluence node of the pipe network, this total return water flow is physically split and forms two independent water flow branches due to the influence of the fluid network pressure field distribution. The first water, under the action of the fluid negative pressure generated at the inlet side of the guide pump 13, overcomes the friction resistance of the connecting pipe and flows back to the bottom inlet port of the heating water tank 2. After entering the heating water tank 2, this part of the water receives heat exchange supplementary heating from the air source heat pump host 1. The second water, under the action of the residual dynamic pressure of the terminal return water pump 15, flows into the third hot water storage tank 5 and the sixth hot water storage tank 8. This part of the water participates in the physical displacement of the modular hot water storage tank array, pushing the high-temperature hot water at the front end into the main supply pipe to increase the temperature at the end of the pipe network.

[0053] The dynamic water diversion process at the confluence node follows the principles of nodal flow continuity and parallel pipeline resistance balance in fluid mechanics. Specifically, according to the nodal continuity principle, the total return water volumetric flow rate generated by the terminal return pump 15 is numerically equal to the sum of the first branch water volumetric flow rate diverted into the heating water tank 2 and the second branch water volumetric flow rate diverted into the third and sixth hot water storage tanks 5 and 8. According to the parallel pipeline resistance balance principle, the fluid pressure in the two independent water flow branches decreases between the confluence node and their respective target nodes, thus maintaining dynamic balance. The pressure drop of the first branch water is expressed as the product of the comprehensive fluid resistance of the pipeline between the confluence node and the heating water tank 2 and the square of the first branch water volumetric flow rate, minus the effective fluid pressure rise provided by the transfer pump 13 under the current operating conditions. The pressure drop of the second branch water is expressed as the product of the comprehensive fluid resistance of the pipeline between the confluence node and the third and sixth hot water storage tanks 5 and 8 and the square of the second branch water volumetric flow rate. Under the physical constraint of equal pressure drops in the two branches, the system autonomously achieves dynamic balance in flow distribution.

[0054] Relying on the natural hydraulic balance characteristics of the closed-loop pipe network, the system achieves autonomous flow allocation for the circulation of insulated return water and heat source replenishment without the need for additional physical diversion valves. As the heating water tank 2 continuously outputs heat to the pipe network and the first and fourth hot water storage tanks 3 and 6 continuously push high-temperature water into the main water supply pipeline, the temperature at each node of the pipe network gradually rises. When the temperature detected by the eleventh temperature sensor 30 reaches the preset fifth threshold, or the temperature detected by the fifth temperature sensor 24 reaches the preset seventh threshold, the control unit shuts down the corresponding water pump according to the exit logic, and the system switches from concurrent collaborative operation to single-cycle operation or standby mode.

[0055] The energy-efficient optimized hot water control system provided in this embodiment of the invention switches to an overall dynamic operation mode based on constant pressure of tap water when the user terminal 17 turns on the water-using equipment.

[0056] The system's piping network and all levels of hot water storage tanks adopt a closed physical structure. The fluid inside the piping network is not directly connected to the external atmospheric environment. The tap water replenishment device 19, as the system's only basic power input node, is specifically manifested as a mechanical connection component that directly connects to the municipal tap water network. The pipe diameter and flow area inside this component determine the physical upper limit of the system's replenishment water volume. Under static conditions where there is no water usage at the user terminal 17 and no water pump is running in the system, the static pressure of the fluid inside the closed piping network and the municipal water supply pressure introduced by the tap water replenishment device 19 maintain an absolute physical balance.

[0057] When the water-using equipment at user terminal 17 is turned on, fluid flows out of the system from the end of the main water supply pipeline, causing a momentary drop in fluid pressure within the pipe network. A physical pressure difference is formed between the input end of the tap water replenishment device 19 and the end of the main water supply pipeline. Driven by this pressure difference, municipal tap water is continuously injected into the closed pipe network through the tap water replenishment device 19.

[0058] The fluid dynamics of the entire hot water control system follows Bernoulli's principle of energy conservation and the principle of pipeline resistance balance in fluid mechanics. Specifically, the total fluid pressure provided by the input of the tap water supply equipment 19 is decomposed into four physical parts during the fluid transport along the pipeline network to the user terminal 17. The first part is used to maintain the final outlet dynamic pressure required for the water flow to reach the water-using equipment at the user terminal 17. The second part is used to overcome the hydrostatic pressure drop caused by the difference in height due to gravity between the lowest and highest points of the system. The third part is used to overcome the friction loss caused by the physical friction between the water flow and the inner walls of various connecting pipes. The fourth part is used to overcome the local resistance loss caused by abrupt changes in the flow cross-section or change in the flow direction when the water flow passes through various levels of hot water storage tanks, electric valves, and pipe bends.

[0059] Through the aforementioned dynamic mechanism, the external potential energy of municipal tap water is directly converted into mechanical kinetic energy to drive the physical exchange of hot and cold water within the closed-loop pipe network. The low-temperature tap water entering the system generates fluid thrust at downstream nodes. Relying on the incompressible physical property of water, this thrust is transmitted stage by stage within the multi-stage series-parallel modular hot water storage tank array. The low-temperature tap water compresses the ambient-temperature water at the downstream end of the array, which in turn pushes the high-temperature hot water at the upstream end. The high-temperature hot water ultimately overcomes the overall fluid resistance of the entire pipe network and is pressurized to the user terminal 17.

[0060] In this dynamic architecture, the inlet and outlet pressures of the system originate from the same source. Whether it is cold water flowing directly to user terminal 17 or hot water flowing to user terminal 17 after being heated by the system, it is driven by the same static pressure source at the tap water supply device 19. This homogeneous driving configuration physically ensures that the cold water pipeline and the hot water pipeline have the same initial pressure reference when mixing and exiting user terminal 17, avoiding flow fluctuations caused by pressure differences between the hot and cold ends during fluid transportation.

[0061] The closed-loop pressurized design and constant-pressure drive mechanism enable the use of residual pressure in the municipal water supply network to transport water within the system. During the water supply process to user terminal 17, no additional electrified booster pump is required on the main water supply pipeline. This physical structure directly replaces the technical characteristic of conventional open hot water systems that rely on variable frequency pumps for fluid power.

[0062] The energy-efficient optimized hot water control system provided in this embodiment of the invention executes passive water-pushing heating logic when there is water use at the user terminal 17 and the modular pressurized hot water storage tank array has sufficient heat storage.

[0063] The system control unit receives node data transmitted from the multi-dimensional temperature sensing network in real time. The eleventh temperature sensor 30 is located inside the sixth hot water storage tank 8, and its detection data represents the physical heat storage state boundary of the last node of the entire water tank array. When the eleventh temperature sensor 30 detects that the physical water temperature in the sixth hot water storage tank 8 is higher than or equal to the preset fifth threshold, the Boolean logic judgment model in the system identifies the current pipe network state as an overall heat storage saturation condition.

[0064] Under this operating condition, the control unit sends a power-off command to the water pump 13 or maintains its power-off state, causing the water pump 13 to be physically stopped. Simultaneously, the air source heat pump unit 1 is in standby hibernation mode due to temperature control logic. During this process, the system does not consume additional electrical energy for forced fluid circulation or active heat compensation, relying entirely on the basic pressure of the pipe network for water supply.

[0065] When the user terminal 17 turns on the water supply equipment, the end of the main water supply pipeline is connected to the outside atmosphere, causing a sudden change in fluid resistance within the pipeline network and creating a fluid pressure difference between the system and the municipal water supply network. Driven by its own pipeline pressure, external municipal tap water is passively injected into the closed system through the tap water replenishment device 19. Specifically, this water injection process involves low-temperature tap water being diverted through pipelines and flowing directly to the bottom inlet ports of the third hot water storage tank 5 and the sixth hot water storage tank 8.

[0066] The low-temperature tap water entering the third and sixth hot water storage tanks 5 and 8 creates an upward physical thrust within the sealed tank interiors. Under the physical constraints of incompressible fluid properties, the water inside the multi-stage hot water storage tank array undergoes equal volume displacement. The original medium-temperature water inside the third and sixth hot water storage tanks 5 and 8 is mechanically pushed into the second and fifth hot water storage tanks 4 and 7. As water continues to enter the front-end nodes, the water in the second and fifth hot water storage tanks 4 and 7 continues to physically displace towards the front-end nodes, squeezing out the high-temperature hot water stored in the first and fourth hot water storage tanks 3 and 6. The multi-stage array structure maintains thermodynamic stratification of the hot and cold water during movement, avoiding a sudden drop in water temperature caused by direct large-area mixing of cold water. The squeezed-out high-temperature hot water flows into the main water supply pipeline and is transported to the user terminal 17 along the main pipeline. Under the passive push-type heating logic, the physical model of the system's heat output to the terminal follows the fluid thermodynamic energy equation, expressed as: ; In the formula, The effective heat dissipation rate output by the system to user terminal 17; The physical density of the fluid inside the main water supply pipeline; The fluid volume flow rate at the user terminal 17 during water use is determined by the physical opening of the valve of the terminal water-using equipment and the overall driving pressure of the pipeline network. The specific heat capacity at constant pressure of the working fluid, water. The temperature of the mixed high-temperature water output from the first hot water storage tank 3 and the fourth hot water storage tank 6 to the main pipeline; The temperature of municipal cold water introduced into the tap water supply equipment 19.

[0067] The system employs a constant pressure drive mechanism based on the same source of tap water during hot water output. The cold water and hot water pipelines share the same reference hydrostatic pressure at the user's terminal water device (17). When the cold and hot water physically mix inside the terminal water device, a stable flow rate and set temperature are maintained, preventing drastic temperature fluctuations caused by pressure imbalances in the two pipe networks.

[0068] The energy-efficient optimized hot water control system provided in this embodiment of the invention executes dynamic flow diversion and instant heating logic in the pipeline network when the user terminal 17 turns on the water-using equipment and the modular pressurized hot water storage tank array has insufficient heat storage. The system control unit receives water flow sensor signals from the main water supply pipeline and node data transmitted from the multi-dimensional temperature sensor network in real time. The water flow sensor is specifically a target flow switch or Hall effect water flow sensor installed in the pipeline at the front end of the user terminal 17 to obtain physical signals of directional displacement of fluid inside the pipeline network. The eleventh temperature sensor 30 is located inside the sixth hot water storage tank 8. When the physical water temperature detected by it is lower than the preset minimum guaranteed temperature threshold, the system's built-in Boolean logic judgment model identifies the current pipeline network state as a condition of insufficient heat storage. When it is confirmed that there is water flow at the user terminal 17 and the overall heat storage of the pipeline network is insufficient, the control unit triggers the instant heating mechanism.

[0069] The control unit synchronously outputs a high-level drive signal, closing the power supply circuits of the air source heat pump host 1, the host-side circulation pump 12, and the water pump 13, and driving the valve core of the electric two-way valve 18 to rotate to the flow channel open position. The host-side circulation pump 12 is powered on and generates negative pressure at its inlet port, drawing low-temperature water from the bottom of the heating water tank 2 into the air source heat pump host 1 for forced heat exchange. The high-temperature fluid, after absorbing the work done by the compressor and the ambient heat, is output from the air source heat pump host 1 and reinjected into the upper space of the heating water tank 2. At the pipeline fluid transport level, a physical flow distribution network is formed inside the closed system, dominated by the mechanical dynamic pressure of the water pump and the static pressure of the tap water network. When the user terminal 17 turns on the water-using equipment, the physical space at the end of the pipeline is opened and the pressure is released. Driven by its own supply pressure, municipal tap water is passively injected into the closed system through the tap water replenishment device 19. This portion of tap water at a lower temperature flows directly into the bottom area of ​​the third hot water storage tank 5 and the sixth hot water storage tank 8. Due to the physical constraint of the incompressibility of fluids, the static pressure of tap water is converted into forward mechanical thrust within the multi-stage hot water storage tank array, pushing the water at medium and low temperatures inside each tank sequentially toward the first hot water storage tank 3 and the fourth hot water storage tank 6.

[0070] The pump 13, in operation, establishes a mechanical head at its outlet, actively drawing in the high-temperature water flow that has been instantly heated inside the heating water tank 2. This high-temperature fluid passes through the electrically operated two-way valve 18 and enters the main water supply pipeline. At the physical pipeline junction points set by the system, the instantly heated water flow delivered by the pump 13 merges with the water flow discharged from the hot water storage tank array by the push of tap water. The fluid merging process within the pipeline network follows the principle of conservation of mass and volume at nodes in fluid mechanics. In specific implementation, at the physical junction points, the total fluid volumetric flow rate output by the end of the pipeline at the user terminal 17 during water use is numerically strictly equal to the sum of the volumetric flow rates of the two input ends. One input end is the volumetric flow rate of the instantly heated water drawn by the pump 13 from the heating water tank 2 and delivered to this node. The other input end is the volumetric flow rate of the water passively discharged into this node from the front end of the multi-stage hot water storage tank array under the action of static pressure introduced by the tap water replenishment device 19. The system relies on the natural transmission and dynamic balance characteristics of fluid pressure in the closed pipe network. The operating head of the water pump 13 and the injection pressure of tap water form a counterbalance at the junction node. Without the need to configure an additional variable flow regulating valve, the system can autonomously realize the dynamic distribution of the two water supply flows.

[0071] During instant heating, the heating power output of the air source heat pump unit 1 to the system is physically constrained by the principle of fluid thermodynamic energy balance. Specifically, the effective heating power output of the air source heat pump unit 1 in real time needs to meet the sensible heat load required to raise the temperature of the water flowing through it and compensate for the system's heat loss. This effective heating power is numerically equal to the product of four physical quantities: the density of the working fluid water in the system, the instantaneous heating water volume flow rate provided by the water pump 13, the specific heat capacity of the water at constant pressure, and the difference between the preset target outlet temperature of the user terminal 17 and the inlet water temperature at the bottom of the heating water tank 2 detected by the first temperature sensor 20. In addition to the sum of these products, the heating power also needs to be supplemented by the heat energy lost by the heating water tank 2 and connecting pipes to the external environment per unit time.

[0072] The air source heat pump unit 1 operates at high frequency and continuously injects heat into the heating water tank 2, ensuring that the fluid drawn by the water pump 13 can quickly reach the target supply water temperature. The high enthalpy fluid mixes into the main pipeline network at the junction node, directly filling the heat energy gap caused by insufficient heat storage in the hot water storage tank array, maintaining the physical stability of the fluid temperature finally delivered to the user terminal 17. When the water flow sensor detects that the water flow in the pipeline network has stopped, or when the value detected by the eleventh temperature sensor 30 returns to the set threshold, the control unit cuts off the control power of the water pump 13 and the main unit, and the system exits the instant heating state.

[0073] The energy-efficient optimized hot water control system provided in this invention incorporates a photothermal conversion priority and high-grade electrical energy complementary control mechanism in its heat source scheduling and operation management to minimize the overall system energy consumption. The system is equipped with a first solar collector 9, a second solar collector 10, and a third solar collector 11, which together constitute a basic photothermal conversion array. This array directly converts solar shortwave radiation energy into the internal energy of the working fluid, water. The air source heat pump unit 1 serves as the system's backup heat source. Specifically, it comprises a closed-loop reverse Carnot cycle mechanical device consisting of a compressor, evaporator, condenser, and expansion valve. It relies on consuming externally input high-grade electrical energy to drive the compressor, extracting low-grade heat from the surrounding atmosphere and transferring it to the water.

[0074] The control unit performs real-time assessment of the environmental energy input status through a multi-dimensional temperature sensor network. Temperature data from the seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28 characterize the physical conversion effect of the current solar radiation intensity. When the system determines that the overall heat storage of the pipe network is insufficient and requires additional heat energy, the control logic does not immediately start the air source heat pump unit 1, but instead prioritizes reading the temperature status of the solar-thermal conversion array. The hardware interlocking state of solar-thermal priority and electrical energy complementarity is controlled by the system's built-in priority evaluation logic model, expressed by the following formula: ; In the formula, This is the operating authorization status parameter for the air source heat pump unit 1. When the value of this parameter is 0, it means that the control unit locks the startup program of the air source heat pump unit 1 at the software level, ignores all normal heating demand signals, and forces the unit to remain in a power-off sleep state; when the value of this parameter is 1, it means that the control unit unlocks the software lock on the unit, allowing it to be triggered to run according to normal temperature conditions. A mathematical function to find the minimum value; The temperature detected by the seventh temperature sensor 26; The temperature detected by the eighth temperature sensor 27; The temperature detected by the ninth temperature sensor 28; The minimum temperature difference threshold for effective photothermal conversion.

[0075] When the difference between the lowest temperature measured by the three solar collector sensors and the base water temperature at the bottom of the heating water tank 2 is greater than or equal to the preset minimum temperature difference threshold, the control logic determines that the current solar radiation energy is sufficient and the photothermal conversion array has the physical conditions to transfer effective heat into the water tank. The control unit sets the operating authorization status parameter to 0 and executes the photothermal conversion priority strategy. The system only starts the solar circulation pump 14, relying on free solar energy for water circulation heating, avoiding the ineffective parallel operation of the air source heat pump unit 1 driven by high-grade electrical energy.

[0076] As solar radiation weakens or nighttime operation begins, the internal temperature of the solar collector decreases. When the difference between the lowest temperature detected by the collector sensor and the base water temperature at the bottom of heating tank 2 is less than the preset minimum temperature difference threshold, the control logic determines that the photothermal conversion energy has attenuated and can no longer provide effective heat transfer. The control unit switches the operating authorization status parameter to 1, and the photothermal conversion priority is revoked by the system.

[0077] After the solar thermal priority is revoked, the system enters the high-grade electrical energy complementary control process. Based on data from the first temperature sensor 20 inside the heating water tank 2 and the eleventh temperature sensor 30 at the end of the thermal storage array, the control unit independently determines whether to start the air source heat pump unit 1 and the water pump 13. Relying on the stable electrical energy conversion heating capacity of the air source heat pump unit 1, the system can still continuously inject heat into the closed-loop network during cloudy or rainy weather or at night, compensating for the physical limitations of a single solar thermal source constrained by natural climate.

[0078] The energy-efficient optimized hot water control system provided in this embodiment of the invention constructs a mechanism for replacing the power consumption of the circulating pump by closed-loop pressurized static pressure work in its operational dynamics design. Through the physical transformation of the fluid mechanical structure, the overall energy consumption of the system when supplying water to the user terminal 17 is reduced.

[0079] Traditional open-type hot water systems are limited by their physical structure; the inside of the hot water storage tank is open to the outside atmosphere, and the water inside lacks the mechanical kinetic energy to spontaneously flow to the user terminal 17. The system must be equipped with a high-power electrified booster pump on the main outlet pipe, relying on high-grade electrical energy to provide the fluid transport head. This embodiment of the invention, through a fully enclosed pipe network design and a pressurized water tank inner tank structure, changes the source of power for fluid transport. The system's heating water tank 2 and the first to sixth hot water storage tanks 3 all adopt a closed pressurized physical structure, specifically a sealed volumetric inner tank made of food-grade stainless steel with full penetration welding. These inner tanks and connecting pipes form a closed fluid network, not directly connected to the external atmosphere. Municipal tap water is connected to this closed network through a tap water replenishment device 19. When there is no water usage at the user terminal 17, the pipe network is filled with working fluid water, and the static pressure of the fluid inside the system remains balanced with the static pressure of the municipal tap water supply network.

[0080] When the user terminal 17 turns on the water supply equipment, the pipeline terminal is connected to the external environment, and the internal pressure of the system is released. A physical pressure gradient is formed between the municipal water supply static pressure at the tap water replenishment device 19 and the user terminal 17. The municipal tap water is injected into the system under the drive of the pressure gradient, relying on its inherent potential energy. The injected tap water exerts hydrostatic pressure on the existing water body in the closed hot water storage tank, forcing the water body to overcome the frictional resistance of the pipeline and physically displace towards the user terminal 17.

[0081] During this process, the static pressure input from the municipal water supply network continuously performs mechanical work on the fluid inside the system. This static pressure work physical model follows the principle of mechanical work in fluid mechanics. Specifically, the effective mechanical work performed by the static pressure input from the municipal water supply network on the fluid inside the system during water supply is numerically equal to the product of the effective static pressure difference from the municipal water supply network introduced by the water supply replenishment device 19 and the real-time fluid volumetric flow rate that changes over time at the user terminal 17 during water use, and the integral sum of these products over the entire continuous water use period when the user terminal 17 is activated once.

[0082] The equivalent electrical energy saved by the system during a single water supply process through the static pressure work mechanism is calculated in accordance with the same energy conversion calculation rules. Specifically, the saved equivalent electrical energy is numerically equal to the effective mechanical work calculated above, divided by the product of the hydraulic efficiency of the fluid mechanical conversion impeller of the traditional variable frequency booster pump and the electromechanical conversion efficiency of the drive motor.

[0083] The physical model described above shows that the static pressure of the municipal water supply network directly bears all the dynamic load during the fluid transport process. The pushing work generated when tap water is injected replaces the mechanical pumping work required to transport an equal volume of water to the user terminal 17 on a physical scale.

[0084] The specification of this invention clearly states that the system utilizes the static pressure of municipal tap water input to drive unidirectional fluid flow within a closed pipe network and supply water to the user terminal 17. In terms of the execution logic and the final technical effect, this is equivalent to a mechanical solution that additionally configures an electrified booster pump on the main water supply pipeline and consumes electrical energy for forced drive. This design, while meeting the user's water flow and pressure requirements, eliminates the energy-consuming hardware node of the terminal water supply pump from the source of the physical structure, achieving a substantial reduction in the system's operating power consumption.

[0085] The following is a specific application scenario deployment example of a chain hotel's energy-efficient optimized hot water control system: This example is applied to a chain hotel with 120 rooms in a central city in southern China, with an average daily hot water demand of approximately 15m³. 3 This is to solve the problems of high energy consumption and large fluctuations in water temperature and pressure at the terminal of the original open hot water system.

[0086] The heat source station includes one 25HP air source heat pump unit and a total area of ​​60m². 2 The system consists of three sets of large-tube solar collectors. The thermal storage unit comprises seven 2000L food-grade stainless steel closed-loop pressure tanks, connected in series and parallel to form heating water tank 2 and the following storage tanks: first, second, third, fifth, sixth, and seventh. A multi-dimensional temperature sensor network (first temperature sensor 20, second temperature sensor 21, third temperature sensor 22, fourth temperature sensor 23, fifth temperature sensor 24, sixth temperature sensor 25, seventh temperature sensor 26, eighth temperature sensor 27, ninth temperature sensor 28, tenth temperature sensor 29, and eleventh temperature sensor 30) is configured throughout the entire process. The power measurement unit includes a tap water supply device 19 (connected to 0.35MPa municipal static pressure), a water pump 13, a solar circulation pump 14, a terminal return pump 15, and a Hall effect flow sensor on the main water supply pipeline.

[0087] The system flow and control data interaction process includes: Step 1: Prioritizing solar thermal collection and mapping closed-loop thermal storage. Tap water overflows the entire closed-loop pipe network through the tap water replenishment device 19, entering a standby state with no water usage. The system reads the readings of the seventh temperature sensor 26, the eighth temperature sensor 27, and the ninth temperature sensor 28 in real time. When the temperatures of the first solar collector 9, the second solar collector 10, and the third solar collector 11 all reach the preset first threshold (e.g., 55℃), and the eleventh temperature sensor 30 shows that the temperature at the thermal storage terminal is lower than the target value, the system timestamps T1. The system generates a solar thermal priority command, and the software locks the air source heat pump host 1 (the operation authorization status parameter is set to 0). The solar circulation pump 14 is started, pushing the high-temperature water from the collector array into the heating water tank 2. Data from the eleventh temperature sensor 30 is continuously collected. When the temperature in the sixth hot water storage tank 8 reaches the second threshold (e.g., 50℃), it is determined that the overall heat storage capacity of the hot water storage tank array is saturated, a shutdown command is output, the solar circulation pump 14 stops, and the zero-power heat storage is completed.

[0088] Step Two: Concurrent Collaboration and Dynamic Balance of Pipeline Fluid During the T2 period at night, when there is no sunlight and the environment cools down, heat loss and insufficient heat storage occur simultaneously in the pipeline network. The fifth temperature sensor 24 detects that the terminal main pipe is below the sixth threshold (e.g., 40°C); simultaneously, the first temperature sensor 20 detects that the heating water tank 2 is above the third threshold, and the eleventh temperature sensor 30 is below the fourth threshold. The system synchronously starts the water transfer pump 13 and the terminal return pump 15, and opens the electric two-way valve 18. The total return flow generated by the terminal return pump 15 undergoes autonomous physical diversion at the confluence node due to the fluid pressure field. Relying on the principle of parallel pipeline resistance balance, the system automatically distributes the return flow into two paths: the first path, under the pressure head of the water transfer pump 13, returns to the heating water tank 2 for heat pump supplementary heating; the second path, under the residual dynamic pressure, enters the third and sixth hot water storage tanks 5 and 8 to participate in flow displacement. Adaptive dynamic distribution of flow can be achieved without additional regulating valves.

[0089] Step 3: Terminal Water Use and Static Pressure Work Attribution Response During peak periods, multiple shower devices are activated at user terminal 17. The Hall effect flow sensor in the main pipeline detects fluid displacement signals, and the pressure at the end of the pipeline is released instantaneously. A physical pressure difference is formed between the municipal water supply static pressure (0.35MPa) at the tap water replenishment device 19 and the terminal. The system does not require the activation of any water supply booster pump, utilizing the static pressure of the tap water as direct power to inject water into the bottom of the third and sixth hot water storage tanks 5 and 8. Based on the continuity conservation of incompressible fluids, the static pressure of the cold water is converted into mechanical thrust, smoothly squeezing the high-temperature hot water in the first and fourth hot water storage tanks 3 and 6 to user terminal 17, achieving efficient water output with equal pressure and volume. Experimental Verification and Effect Comparison To verify the actual effect of this system, a 30-day comparative experiment was conducted at the hotel.

[0090] The control group used a traditional open-type hot water storage tank and a variable frequency booster pump, relying solely on an air source heat pump for heating. The experimental group employed the closed-type pressurized dual-heat source coupling system of this invention, implementing a static pressure work and light-thermal priority strategy.

[0091] like Figure 3 As shown, the horizontal axis represents the time of day (0-24 hours), and the vertical axis represents the water supply pressure at the user end (MPa). Figure 3 The solid black dots represent the water pressure data of the experimental group, closely distributed around the municipal static pressure baseline of 0.35 MPa. The hollow gray squares represent the control group's data, which experienced drastic pressure fluctuations (even dropping to 0.15 MPa) during peak water usage periods due to the sluggish response of the variable frequency pump and changes in the open water tank level. The experimental group successfully intercepted 100% of the internal pressure jumps through a constant pressure drive mechanism, preventing abnormal water experiences such as sudden temperature changes from reaching the user. In contrast, the control group directly transmitted these pressure fluctuations to the mixing valve, resulting in severely distorted water quality.

[0092] like Figure 4 As shown, this figure presents two-dimensional cross-sectional data when the ambient temperature is set to a typical value (25℃). The horizontal axis represents solar irradiance (W / m²). 2 The vertical axis represents the overall system energy efficiency ratio (COP). Figure 4 The solid black line (with a solid triangle) represents the energy efficiency response curve of the experimental group. As solar irradiance increases, the COP of the experimental group shows an upward trend by introducing photothermal synergy; in Figure 4 The optimal point marked with a black pentagram (irradiance > 800 W / m²) 2 The interval clearly indicates the state when the system completely disconnects the heat pump power and relies solely on the solar thermal cycle, with the COP value showing a sharp, jumpy increase. The dark gray dashed line (marked with hollow squares) represents the control group data. Since the control group relies solely on the electrically driven heat pump and lacks the ability to coordinate solar and thermal energy, its COP value remains at a relatively low and fixed level, appearing as a flat horizontal line, unable to utilize free ambient heat energy for optimization.

[0093] like Figure 5 As shown, the horizontal axis represents the number of experimental days (day 1 to day 30), and the vertical axis represents the daily power consumption of the water pump system (kWh). The solid line with solid circles (experimental group) represents the experimental group, whose daily power consumption is low (close to 0-2 kWh), only briefly consumed at night during anti-cold water circulation or heating. Static pressure work completely replaces the water supply power consumption. The dashed line with hollow squares (control group) represents the control group, whose daily power consumption fluctuates between 15-20 kWh. Because the variable frequency booster pump needs to frequently start and stop whenever guest rooms use water, no energy-saving effect was observed.

[0094] Effect Comparison Summary Table Experimental results show that the embodiments of the present invention effectively eliminate unnecessary energy loss and pressure noise data caused by water supply pumps in traditional open systems through closed-loop pressurized physical structures and static pressure work verification; and solve the data gap and hydraulic distribution problems when multiple heat sources operate concurrently under multiple conditions through Boolean logic and multi-dimensional sensor mapping. The thermodynamic closed-loop control system constructed based on this can quickly respond to optimal operating conditions, improving the intelligence level and economic efficiency of building hot water system operation.

[0095] The above description is merely some specific implementations of this application and is not intended to limit the scope of protection of this application. Any variations or substitutions easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A hot water control method based on energy efficiency optimization, characterized in that, Includes the following steps: Tap water enters the pipeline of the hot water control system through the tap water replenishment equipment (19), and uses municipal static pressure to drive the water flow to circulate and supply water to the user terminal (17); Obtain water temperature data from each temperature sensor in the pipeline of the hot water control system to determine the water usage status of the user terminal (17); When there is no water, the first heating cycle is executed according to the temperature of the first solar collector (9), the second solar collector (10) and the third solar collector (11), or the second heating cycle or anti-cold water cycle is executed according to the temperature of the heating water tank (2) and the sixth hot water storage tank (8); When water is used, the water pump (13) is started and stopped according to the temperature of the sixth hot water storage tank (8), and the tap water is pumped to the hot water in the first hot water storage tank (3) and the fourth hot water storage tank (6) and flows to the user terminal (17).

2. The method according to claim 1, characterized in that, The specific steps of the first heating cycle include: Read the temperature data from the seventh temperature sensor (26), the eighth temperature sensor (27), and the ninth temperature sensor (28); When the detected temperatures of the seventh temperature sensor (26), the eighth temperature sensor (27), and the ninth temperature sensor (28) all reach the first threshold, the solar circulation pump (14) is started. The hot water in the first solar collector (9), the second solar collector (10), and the third solar collector (11) flows to the heating water tank (2). The water flows from the heating water tank (2) into the first hot water storage tank (3) and the fourth hot water storage tank (6) and then flows to the second hot water storage tank (4) and the fifth hot water storage tank (7) in sequence. The water in the third hot water storage tank (5) and the sixth hot water storage tank (8) flows back to the first solar collector (9), the second solar collector (10), and the third solar collector (11). When the eleventh temperature sensor (30) detects that the water temperature in the sixth hot water storage tank (8) has reached the second threshold, the solar circulation pump (14) is stopped.

3. The method according to claim 1, characterized in that, The specific steps of the second heating cycle include: When the first temperature sensor (20) detects that the temperature of the heating water tank (2) reaches the third threshold, and the eleventh temperature sensor (30) detects that the temperature in the sixth hot water storage tank (8) is lower than the fourth threshold, the air source heat pump host (1), the water pump (13) and the electric two-way valve (18) are turned on. Water in the heating water tank (2) flows into the first hot water storage tank (3) and the fourth hot water storage tank (6) and then flows into the second hot water storage tank (4) and the fifth hot water storage tank (7) in sequence. Water in the third hot water storage tank (5) and the sixth hot water storage tank (8) flows back to the heating water tank (2). When the eleventh temperature sensor (30) detects that the temperature of the sixth hot water storage tank (8) is higher than the fifth threshold, the water pump (13) is stopped; when the second temperature sensor (21) detects that the temperature in the heating water tank (2) reaches the eighth threshold, the air source heat pump host (1) is stopped.

4. The method according to claim 1, characterized in that, The specific steps of the anti-cooling water circulation include: When the fifth temperature sensor (24) detects that the temperature of the main water supply line near the user terminal (17) is lower than the sixth threshold, the terminal return water pump (15) is started, and the water in the main water supply line flows into the third hot water storage tank (5) and the sixth hot water storage tank (8). Water flows sequentially from the third hot water storage tank (5) and the sixth hot water storage tank (8) to the second hot water storage tank (4) and the fifth hot water storage tank (7), and then to the first hot water storage tank (3) and the fourth hot water storage tank (6). The water in the first hot water storage tank (3) and the fourth hot water storage tank (6) flows into the main water supply pipeline. When the temperature detected by the fifth temperature sensor (24) reaches the seventh threshold, the end return water pump (15) is stopped.

5. The method according to claim 1, characterized in that, When the hot water control system simultaneously meets the triggering conditions of the second heating cycle and the anti-cold water cycle, the specific steps for simultaneously executing the second heating cycle and the anti-cold water cycle include: The end return water pump (15) draws water from the end of the main water supply pipeline into the return water pipeline, and divides it into the first water and the second water at the branching node of the return water pipeline. The first stream of water flows back to the heating tank (2) under the action of the water pump (13) to receive supplementary heating from the air source heat pump host (1); the second stream of water flows into the third hot water storage tank (5) and the sixth hot water storage tank (8), and pushes the water in the third hot water storage tank (5) and the sixth hot water storage tank (8) into the main water supply line.

6. The method according to claim 1, characterized in that, The specific steps when water is available include: When the eleventh temperature sensor (30) detects that the temperature in the sixth hot water storage tank (8) is higher than the fifth threshold, the water pump (13) is controlled to stop. The tap water entering through the tap water supply device (19) flows into the sixth hot water storage tank (8) and the third hot water storage tank (5), pushing the hot water in the first hot water storage tank (3) and the fourth hot water storage tank (6) to the user terminal (17).

7. The method according to claim 6, characterized in that, The specific steps for when water is available also include: When the eleventh temperature sensor (30) detects that the temperature in the sixth hot water storage tank (8) is lower than the fifth threshold, the water pump (13) is started. The first part of the tap water flows into the sixth hot water storage tank (8) and the third hot water storage tank (5) to push the hot water in the first hot water storage tank (3) and the fourth hot water storage tank (6) to the user terminal (17). The second part of the tap water enters the heating water tank (2) through the water pump (13) for heating and is then output to the user terminal (17).

8. The method according to claim 1, characterized in that, It also includes the following heat source scheduling steps: Read the detected temperatures of the seventh temperature sensor (26), the eighth temperature sensor (27), and the ninth temperature sensor (28); When the difference between the lowest temperature obtained by the above sensor and the temperature detected by the first temperature sensor (20) is not less than the minimum temperature difference threshold, the air source heat pump host (1) is controlled to remain in a stopped state, and only the solar circulation pump (14) is started to circulate water for heating.

9. A hot water control system based on energy efficiency optimization, characterized in that, The energy-efficiency-optimized hot water control method applied to any one of claims 1-8 includes: The hot water storage tank group includes a heating water tank (2), a first hot water storage tank (3), a second hot water storage tank (4), a third hot water storage tank (5), a fourth hot water storage tank (6), a fifth hot water storage tank (7), and a sixth hot water storage tank (8). The inner liner of all the tanks is a closed pressure structure with the internal space not connected to the atmosphere. The air source heat pump unit (1) is connected to the heating water tank (2) via the unit-side circulation pump (12); The first solar collector (9), the second solar collector (10), and the third solar collector (11) are connected to the heating water tank (2) via a solar circulation pump (14).

10. The system according to claim 9, characterized in that, The system's piping and power drive components include: A water pump (13) and an electric two-way valve (18) are installed on the main pipeline connecting the heating water tank (2) and the first hot water storage tank (3) and the fourth hot water storage tank (6); The end return water pump (15) is installed in the return water branch of the main water supply line near the user terminal (17), and the output end of the end return water pump (15) is connected to the third hot water storage tank (5) and the sixth hot water storage tank (8). The tap water replenishment equipment (19) is connected to the municipal tap water network and the closed network of the energy-efficient hot water control system through a pipeline, and is directly connected to the inlet pipes of the third hot water storage tank (5) and the sixth hot water storage tank (8); the expansion tank (16) is connected in parallel to the main flow channel of the closed network of the hot water control system.

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