A water heater for energy storage and heat exchange, and its control method and system

Abstract

The present application relates to the technical field of electric water heaters, and specifically discloses a water heater for energy storage and heat exchange, its control method and system. The control method calculates the required instantaneous power based on the current inlet water temperature, current water flow rate and preset temperature of the water heater for energy storage and heat exchange, and calculates the instantaneous power of the instant heating heater based on the current voltage and current of the water heater for energy storage and heat exchange; if the required instantaneous power is greater than the instantaneous power of the instant heating heater, the instant heating heater is turned on, the first adjustment power is calculated based on the required instantaneous power, and the position of the mixing valve is adjusted based on the adjustment ratio of the first mixing valve of the first adjustment power; based on the temperature difference between the current outlet water temperature and the preset temperature, the PID algorithm is used to correct the adjustment ratio of the first mixing valve, and the position of the mixing valve is adjusted based on the corrected adjustment ratio of the mixing valve until the current outlet water temperature meets the preset temperature; the present application can enable the water heater for energy storage and heat exchange to achieve rapid constant temperature while saving energy.

Description

Technical Field

[0001] This application relates to the technical field of electric water heaters, and particularly to a water heater for energy storage and heat exchange, and its control method and system. Background Art

[0002] Existing electric water heaters mainly include three types: storage-type electric heaters, instant-heating electric heaters, and energy storage-type electric water heaters; the storage-type electric water heater can set the water temperature in the inner tank, but the user needs to heat the water in the inner tank in advance before using water, and mix water through a mixing valve to meet the water temperature requirement for use; the instant-heating electric water heater controls the power of the heating module through a thyristor according to the temperature set by the user to quickly heat the water flow; the energy storage-type electric water heater combines the functions of heat storage and instant heating, and can discharge water quickly and in large quantities according to the set outlet water temperature of the user.

[0003] However, the current control scheme for energy storage-type electric water heaters is relatively simple. Usually, the energy storage medium is first heated to a certain temperature, and then the heat is transferred to the water for use through heat exchange. The heating speed in this process is relatively slow, and it is difficult to quickly reach a constant temperature state; there is a lack of a systematic water energy storage control scheme, and there is no obvious advantage in terms of energy conservation and quick constant temperature.

[0004] Moreover, the existing control scheme for phase change material energy storage and heat exchange has deficiencies in the control logic of energy storage control and constant temperature water output. For example, in the process of heat transfer from the phase change material to the water, due to the limited heat transfer coefficient between the two, the heat may not be quickly and effectively transferred to the water flow, resulting in the outlet water temperature not quickly reaching the set constant temperature value. In addition, the thermal conductivity of most phase change materials is relatively low, and the heat transfer speed is slow during the energy storage process, resulting in a long energy storage time and low efficiency, which is likely to lead to the failure to achieve the goals of energy conservation, quick constant temperature, and energy consumption savings according to demand. Summary of the Invention

[0005] This application provides a water heater for energy storage and heat exchange, and its control method and system, which can enable the water heater for energy storage and heat exchange to achieve quick constant temperature while saving energy.

[0006] In a first aspect, the present application provides a control method for a water heater for energy storage and heat exchange. The water heater for energy storage and heat exchange includes a mixing valve and an instantaneous water heater. Wherein, the control method includes: when it is detected that there is a water usage demand, based on the current inlet water temperature, the current water flow rate and the preset temperature of the water heater for energy storage and heat exchange, calculate the required instantaneous power, and based on the current voltage and the current current of the water heater for energy storage and heat exchange, calculate the instantaneous power of the instantaneous water heater; if the required instantaneous power is greater than the instantaneous power of the instantaneous water heater, turn on the instantaneous water heater, calculate a first adjustment power based on the required instantaneous power, and based on the first mixing valve adjustment ratio corresponding to the first adjustment power, adjust the position of the mixing valve; calculate the temperature difference between the current outlet water temperature and the preset temperature, based on the temperature difference, use the PID algorithm to correct the first mixing valve adjustment ratio, and based on the corrected mixing valve adjustment ratio, adjust the position of the mixing valve until the current outlet water temperature meets the preset temperature.

[0007] In a possible implementation manner, the control method for a water heater for energy storage and heat exchange provided by the present application further includes: if the required instantaneous power is not greater than the instantaneous power of the instantaneous water heater, obtain the second mixing valve adjustment ratio corresponding to the required instantaneous power, and based on the second mixing valve adjustment ratio, adjust the position of the mixing valve.

[0008] In a possible implementation manner, calculating the required instantaneous power based on the current inlet water temperature, the current water flow rate and the preset temperature specifically includes: calculating the temperature difference between the current inlet water temperature and the preset temperature, inputting the temperature difference and the current water flow rate into a preset required instantaneous power calculation formula, and calculating the required instantaneous power. Wherein, the preset required instantaneous power calculation formula is as follows:

[0009] ;

[0010] In the formula, is the instantaneous power, is the specific heat capacity of water, is the amount of water flowing through per unit time, is the temperature difference between the set temperature and the inlet water temperature, is the unit time.

[0011] In a possible implementation, a first adjustment power is calculated based on the required instantaneous power, and the position of the mixing valve is adjusted based on the first mixing valve adjustment ratio corresponding to the first adjustment power. Specifically, it includes: calculating the product of a preset target ratio and the required instantaneous power, and taking the product as the first adjustment power; obtaining a preset association table of mixing valve adjustment parameters, where the association table of mixing valve adjustment parameters includes multiple groups of powers and the mixing valve adjustment ratios corresponding to the multiple groups of powers respectively; performing a traversal process on the association table of mixing valve adjustment parameters based on the first adjustment power, determining a first target power in the association table of mixing valve adjustment parameters that matches the first adjustment power, and obtaining a first target mixing valve adjustment ratio corresponding to the first target power, and taking the first target mixing valve adjustment ratio as the first mixing valve adjustment ratio corresponding to the first adjustment power.

[0012] In a possible implementation, based on the temperature difference, the PID algorithm is used to correct the first mixing valve adjustment ratio. Specifically, it includes: obtaining the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient of the PID controller; performing optimization processing on the initial proportional coefficient, the initial integral coefficient, and the initial derivative coefficient based on the temperature difference to obtain an optimized proportional coefficient, an optimized integral coefficient, and an optimized derivative coefficient; inputting the temperature difference, the optimized proportional coefficient, the optimized integral coefficient, and the optimized derivative coefficient into the PID controller, so that the PID controller outputs a proportional adjustment amount, and correcting the first mixing valve adjustment ratio based on the proportional adjustment amount to obtain a corrected mixing valve adjustment ratio.

[0013] In a possible implementation, a control method for a water heater for energy storage and heat exchange provided by the present application, the water heater for energy storage and heat exchange further includes a water storage tank and a water valve. Wherein, the control method further includes: respectively performing a fault detection and a water volume detection of the water storage tank on the water heater for energy storage and heat exchange. When it is detected that the water heater for energy storage and heat exchange has no fault and the water volume of the water storage tank meets a preset water volume threshold of the water storage tank, a water usage demand detection is performed on the water heater for energy storage and heat exchange based on the water valve; when it is detected based on the water valve that the current water flow rate meets a preset water flow rate threshold, it is determined that there is a current water usage demand.

[0014] In a possible implementation, the fault detection of the water heater for energy storage and heat exchange specifically includes: after detecting that the water heater for energy storage and heat exchange is powered on, performing a fault detection on each module circuit in the water heater for energy storage and heat exchange. When a fault is detected in a target module circuit, generating a fault code corresponding to the target module circuit and displaying the fault code on the display module of the water heater for energy storage and heat exchange.

[0015] In a possible implementation, water volume detection of the water heater for energy storage and heat exchange is specifically as follows: Obtain the water volume of the water storage tank. When the water volume of the water storage tank does not meet the preset water volume threshold of the water storage tank, automatically replenish water to the water storage tank until the water volume of the water storage tank meets the preset water volume threshold; Obtain the water storage temperature of the water storage tank. When the water storage temperature does not meet the preset water storage temperature threshold, heat the water stored in the water storage tank until the water storage temperature meets the preset water storage temperature threshold, and stop heating the water stored in the water storage tank; Continuously obtain the current water storage temperature of the water storage tank. When it is detected that the current water storage temperature of the water storage tank drops from the preset water storage temperature threshold to the preset deadband temperature, re-heat the water stored in the water storage tank.

[0016] In a second aspect, the present application provides a control system for a water heater for energy storage and heat exchange, including a power calculation module, a first mixing valve rapid adjustment module, and a mixing valve precise adjustment module; wherein, the power calculation module is configured to, when detecting a water usage demand, calculate a required instantaneous power based on the current inlet water temperature, current water flow rate, and preset temperature of the water heater for energy storage and heat exchange, and calculate the instantaneous power of the instant water heater based on the current voltage and current of the water heater for energy storage and heat exchange; the first mixing valve rapid adjustment module is configured to, if the required instantaneous power is greater than the instantaneous power of the instant water heater, turn on the instant water heater, calculate a first adjustment power based on the required instantaneous power, and perform position adjustment on the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power; the mixing valve precise adjustment module is configured to calculate the temperature difference between the current outlet water temperature and the preset temperature, and based on the temperature difference, correct the first mixing valve adjustment ratio using a PID algorithm, and perform position adjustment on the mixing valve based on the corrected mixing valve adjustment ratio until the current outlet water temperature meets the preset temperature.

[0017] In a third aspect, the present application provides a water heater for energy storage and heat exchange, including a water valve, a water storage tank, a mixing valve, an instant water heater, and the control system of the water heater for energy storage and heat exchange as described above; wherein, the water valve, the water storage tank, the mixing valve, and the instant water heater are respectively connected to the control system; the water outlet end of the water valve is respectively connected to the water inlet end of the water storage tank and the first water inlet end of the mixing valve, the water outlet end of the water storage tank is connected to the second water inlet end of the mixing valve, and the water outlet end of the mixing valve is connected to the water inlet end of the instant water heater.

[0018] In a fourth aspect, an embodiment of the present application further provides a computer device, which includes a memory and a processor, and a computer program is stored on the memory. When the processor executes the computer program, the above control method is implemented.

[0019] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, which can implement the above control method when executed by a processor.

[0020] An embodiment of the present application provides a water heater for energy storage heat exchange, its control method and system, which have the following advantages compared with the prior art:

[0021] When a water usage demand is detected, calculate the required instantaneous power according to the current inlet water temperature, water flow rate and preset temperature, and compare it with the instantaneous power of the instant water heater calculated based on the current voltage and current. If the required instantaneous power is greater than the instantaneous power of the instant water heater, turn on the instant water heater, and at the same time calculate the first adjustment power based on the required instantaneous power, and roughly adjust the position of the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power; enabling the water heater to quickly respond at the moment of water usage, initially adjusting the cold and hot water mixing ratio, quickly providing hot water close to the preset temperature for the user, greatly shortening the waiting time for the hot water to reach the appropriate temperature, and improving the problems of slow heating speed and difficulty in quickly maintaining a constant temperature of traditional energy storage electric water heaters; subsequently, calculate the difference between the current outlet water temperature and the preset temperature, use the PID algorithm to correct the first mixing valve adjustment ratio, and based on the corrected mixing valve adjustment ratio, achieve fine adjustment of the position of the mixing valve, which can finely compensate for the water temperature deviation after rough adjustment, so that the current outlet water temperature is accurately and stably maintained at the preset temperature, effectively solving the problem that the outlet water temperature in the prior art is difficult to quickly reach and maintain a constant temperature; and first determine the approximate first mixing valve adjustment ratio through rough adjustment, which can reduce the power consumption of the instant water heater, and then accurately control the outlet water temperature through fine adjustment, which can further optimize the energy utilization efficiency, enabling the water heater to save energy while more efficiently meeting the user's demand for quickly constant temperature hot water. Description of the Drawings

[0022] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated. The drawings in the figures do not constitute a scale limitation.

[0025] Figure 1 is a schematic flowchart of an embodiment of a control method for a water heater for energy storage and heat exchange provided by the present application;

[0026] Figure 2 is a schematic structural diagram of an embodiment of a control system for a water heater for energy storage and heat exchange provided by the present application;

[0027] Figure 3 is a schematic structural diagram of an embodiment of a water heater for energy storage and heat exchange provided by the present application;

[0028] Figure 4 is another schematic structural diagram of an embodiment of a water heater for energy storage and heat exchange provided by the present application;

[0029] Figure 5 is a schematic structural diagram of an electronic device provided by the present application. Detailed Embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0032] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0033] It should also be understood that the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification of this application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0034] It should be further understood that the term "and / or" used in the specification of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] As used in this specification and the appended claims, the term "if" can be interpreted as "when...", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0036] Embodiment 1, see Figure 1 , Figure 1 is a schematic flowchart of an embodiment of a control method for a water heater for energy storage and heat exchange provided by this application. The control method is used for a water heater for energy storage and heat exchange. Among them, the water heater for energy storage and heat exchange includes a mixing valve, an instant water heater, a water storage tank, and a water valve. As Figure 1 shown, the control method includes Step 101 - Step 103, specifically as follows:

[0037] Step 101: When it is detected that there is a water usage demand, calculate the required instantaneous power based on the current inlet water temperature, current water flow rate, and preset temperature of the water heater for energy storage and heat exchange, and calculate the instantaneous power of the instant water heater based on the current voltage and current of the water heater for energy storage and heat exchange.

[0038] In one embodiment, the water heater for energy storage and heat exchange is respectively subjected to a fault detection and a water volume detection of the water storage tank.

[0039] Specifically, since fault detection of the water heater for energy storage and heat exchange is a necessary step to ensure safe use and normal operation of the system, and the water storage tank is the storage and supply source of hot water, whether the water volume is sufficient is directly related to whether the user's water usage demand can be met. Therefore, after the water heater for energy storage and heat exchange is powered on and started, it is necessary to first perform a fault detection and a water volume detection of the water heater for energy storage and heat exchange.

[0040] In one embodiment, fault detection is performed on the water heater for energy storage and heat exchange, which specifically includes: after detecting that the water heater for energy storage and heat exchange is powered on, fault detection is performed on each module circuit in the water heater for energy storage and heat exchange. When a fault is detected in the target module circuit, a fault code corresponding to the target module circuit is generated, and the fault code is displayed on the display module of the water heater for energy storage and heat exchange.

[0041] Specifically, each of the module circuits includes, but is not limited to, a temperature sensor circuit, a mixing valve circuit, an operator communication circuit, etc.

[0042] Specifically, when performing fault detection on the temperature sensor circuit, a detection resistor or other detection element in the temperature sensor circuit can be used to measure the resistance value or output voltage of the temperature sensor, so as to determine whether there is a short circuit or open circuit in the temperature sensor.

[0043] Specifically, when performing fault detection on the mixing valve circuit, the feedback of its reset signal can be checked to determine whether the mixing valve can be normally reset, so as to determine whether the mixing valve is faulty.

[0044] Specifically, when performing fault detection on the operator communication circuit, it is determined whether the operator is faulty by detecting whether data can be normally received and sent.

[0045] Specifically, when a fault is detected in the target module circuit, the system will immediately generate a corresponding fault code; among them, the fault code is preset, and each fault code uniquely corresponds to a specific fault type; and based on the fault code, rapid fault location can be achieved.

[0046] Preferably, when a fault is detected in the temperature sensor circuit, the fault code E1 corresponding to the temperature sensor circuit is generated; when a fault is detected in the mixing valve circuit, the fault code E2 corresponding to the mixing valve circuit is generated; when a fault is detected in the operator communication circuit, the fault code E3 corresponding to the operator communication circuit is generated.

[0047] Specifically, by immediately performing self-check on the water heater for energy storage and heat exchange after power-on and startup, faults can be detected and displayed in a timely manner. At this time, the heating function is turned off to avoid operating in a fault state and ensure that the system is in a safe and operable state, laying a foundation for subsequent normal use.

[0048] In one embodiment, when detecting the water volume in the water storage tank of the water heater for energy storage and heat exchange, the water volume in the water storage tank is obtained. When the water volume in the water storage tank does not meet the preset water volume threshold of the water storage tank, the water storage tank is automatically replenished with water until the water volume in the water storage tank meets the preset water volume threshold; the water storage temperature of the water storage tank is obtained. When the water storage temperature does not meet the preset water storage temperature threshold, the water stored in the water storage tank is heated until the water storage temperature meets the preset water storage temperature threshold, and the heating of the water stored in the water storage tank is stopped; the current water storage temperature of the water storage tank is continuously obtained. When it is detected that the current water storage temperature of the water storage tank drops from the preset water storage temperature threshold to the preset dead band temperature, the water stored in the water storage tank is reheated.

[0049] Specifically, the water volume in the water storage tank is obtained based on a liquid level sensor. When it is detected that the water volume in the water storage tank is lower than the preset water volume threshold of the water storage tank, it is determined that the water volume in the water storage tank does not meet the preset water volume threshold, and the automatic water replenishment program for the water storage tank is started. Among them, the automatic water replenishment program for the water storage tank controls the water valve in the water heater for energy storage and heat exchange to open, so that external water sources flow into the water storage tank through the water valve until the liquid level sensor detects that the water volume in the water storage tank is not lower than the preset water volume threshold, that is, the water volume in the water storage tank meets the preset water volume threshold, and the automatic water replenishment program for the water storage tank is closed to close the water valve; it ensures that at any time, the water storage tank has enough water volume to meet the potential water use needs of users, avoids the interruption of hot water supply due to insufficient water volume, and maintains the basic operation function of the system.

[0050] Specifically, a water storage temperature probe is arranged in the water storage tank to obtain the water storage temperature of the water storage tank based on the water storage temperature probe.

[0051] Specifically, when the water storage temperature does not meet the preset water storage temperature threshold, the water storage heater is started to heat the water stored in the water storage tank, and during the heating process, the water storage temperature is continuously monitored. Once the preset water storage temperature threshold is reached, the water storage heater is immediately stopped from heating the water to prevent energy waste caused by overheating.

[0052] Specifically, the preset dead-band temperature is a parameter that allows the stored water temperature to fluctuate within a certain range; when the stored water temperature drops from the preset stored water temperature threshold to the dead-band temperature, it means that the stored water temperature in the water storage tank is insufficient, and at this time, the re-heating program needs to be started; this control method based on the dead-band temperature can not only avoid triggering heating due to frequent small temperature fluctuations, reduce the start-stop times of the heater, and extend the service life of the equipment, but also ensure that heat is replenished in time when the stored water temperature actually drops to a level that may affect the quality of hot water supply, providing users with continuous and stable hot water. Especially for users with a large number of family members and strong continuity of bathing time, it effectively guarantees a comfortable user experience and achieves a good balance between energy conservation and practicality.

[0053] Preferably, users can set the stored water temperature and the dead-band temperature according to the household water usage situation; if there are few family members and the bathing time is not continuous, the stored water temperature can be set lower, and at the same time, the temperature difference between the preset stored water temperature and the dead-band temperature can be set larger, which can reduce the waste of energy for heat storage and save electricity; if there are more family members and the bathing time is highly continuous, the stored water temperature can be set higher, and the temperature difference between the preset stored water temperature and the dead-band temperature can be set smaller.

[0054] In an embodiment, when it is detected that the energy storage heat exchange water heater has no fault and the water volume in the water storage tank meets the preset water volume threshold of the water storage tank, the water valve is used to detect the water usage demand of the energy storage heat exchange water heater; when it is detected based on the water valve that the current water flow rate meets the preset water flow rate threshold, it is determined that there is a current water usage demand.

[0055] Specifically, after the water heater is powered on and the fault and the water volume in the water storage tank are detected, the water valve is always in a detection state to detect whether someone uses hot water. When the water valve detects that there is water flow passing through, by comparing the current water flow rate with the preset water flow rate threshold, and when the current water flow rate is not less than the preset water flow rate threshold, it is determined that there is a current water usage demand. At this time, the sensor inside the water valve will convert the water flow signal into an electrical signal and transmit it to the control system of the energy storage heat exchange water heater, thereby triggering the energy storage heat exchange water heater to start the constant temperature program; this detection method based on the water valve is simple, direct, accurate and efficient, can quickly capture the user's water usage intention, realize the rapid switching of the system from the standby state to the working state, and ensure that users can obtain hot water at an appropriate temperature in a timely manner.

[0056] In an embodiment, when calculating the required instantaneous power based on the current inlet water temperature, the current water flow rate and the preset temperature, by calculating the temperature difference between the current inlet water temperature and the preset temperature, inputting the temperature difference and the current water flow rate into a preset required instantaneous power calculation formula, the required instantaneous power is calculated, where the preset required instantaneous power calculation formula is as follows:

[0057] ;

[0058] Wherein, is the instantaneous power, is the specific heat capacity of water, is the water flow rate per unit time, is the temperature difference between the set temperature and the inlet water temperature, is the unit time.

[0059] In one embodiment, when calculating the instantaneous power of the instant water heater based on the current voltage and current of the energy storage heat exchange water heater, the product of the current voltage and the current is calculated, and this product is used as the instantaneous power of the instant water heater.

[0060] Step 102: If the required instantaneous power is greater than the instantaneous power of the instant water heater, turn on the instant water heater, calculate the first adjustment power based on the required instantaneous power, and adjust the position of the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power.

[0061] In one embodiment, when the required instantaneous power is greater than the instantaneous power of the instant water heater, it indicates that relying solely on the current power of the instant water heater cannot meet the requirement of quickly heating the water to the preset temperature. Therefore, it is necessary to adjust the mixing valve and turn on the instant water heater at the same time.

[0062] In one embodiment, when calculating the first adjustment power based on the required instantaneous power and adjusting the position of the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power, the product of the preset target ratio and the required instantaneous power is calculated, and this product is used as the first adjustment power; obtain a preset mixing valve adjustment parameter association table, wherein the mixing valve adjustment parameter association table includes multiple groups of powers and the mixing valve adjustment ratios corresponding to each of the multiple groups of powers; perform a traversal process on the mixing valve adjustment parameter association table based on the first adjustment power, determine the first target power in the mixing valve adjustment parameter association table that matches the first adjustment power, and obtain the first target mixing valve adjustment ratio corresponding to the first target power, and use the first target mixing valve adjustment ratio as the first mixing valve adjustment ratio corresponding to the first adjustment power.

[0063] Specifically, the preset target ratio is 95%. When the required instantaneous power is P, 95%P is used as the first adjustment power.

[0064] Preferably, the preset target ratio can also be set to other target ratio values according to user requirements.

[0065] Specifically, the function of the mixing valve is to adjust the ratio of the water heated by the heat storage tank to the cold water, and can accurately control the mixing water temperature. Therefore, establish the correlation table of the mixing valve adjustment parameters in advance, and record the relationship between different power values and their corresponding mixing valve adjustment ratios through the correlation table of the mixing valve adjustment parameters. This relationship can be obtained through experimental tests. So that after calculating the first adjustment power, the first target mixing valve adjustment ratio can be quickly determined through the correlation table of the mixing valve adjustment parameters, enabling the adjustment of the mixing valve to be based on the real-time required instantaneous power, thereby more accurately controlling the cold and hot water mixing ratio and helping to quickly reach and stably output the water temperature expected by the user.

[0066] Specifically, when adjusting the position of the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power, adjust the valve core position of the mixing valve according to the first mixing valve adjustment ratio to change the cross-sectional areas of the hot water channel and the cold water channel in the mixing valve, thereby realizing the mixing of cold and hot water in the corresponding proportion, meeting the user's demand for water temperature, preliminarily stabilizing the outlet water temperature, and providing a good starting state for the subsequent fine adjustment based on the PID algorithm.

[0067] Step 103: Calculate the temperature difference between the current outlet water temperature and the preset temperature. Based on the temperature difference, use the PID algorithm to correct the first mixing valve adjustment ratio, and adjust the position of the mixing valve based on the corrected mixing valve adjustment ratio until the current outlet water temperature meets the preset temperature.

[0068] In one embodiment, when using the PID algorithm to correct the first mixing valve adjustment ratio, obtain the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient of the PID controller; perform optimization processing on the initial proportional coefficient, the initial integral coefficient, and the initial derivative coefficient based on the temperature difference to obtain the optimized proportional coefficient, optimized integral coefficient, and optimized derivative coefficient; input the temperature difference, the optimized proportional coefficient, the optimized integral coefficient, and the optimized derivative coefficient into the PID controller, so that the PID controller outputs a proportional adjustment amount, and correct the first mixing valve adjustment ratio based on the proportional adjustment amount to obtain the corrected mixing valve adjustment ratio.

[0069] Specifically, the initial proportional coefficient of the PID controller 、initial integral coefficient and initial derivative coefficient It is determined based on the theoretical modeling and empirical estimation of the water heater system; these coefficients have different functions in the control process; among them, the proportional coefficient mainly adjusts the control signal proportionally according to the difference between the set temperature and the actual outlet water temperature; for example, when the temperature difference is large, the mixing valve adjustment ratio is increased to quickly respond to the temperature deviation; the integral coefficient is used to accumulate past temperature deviations, and its function is to eliminate the steady-state error of the system. Even if the temperature difference is small, but if there is a continuous deviation, the integral term will continuously accumulate, causing the mixing valve to gradually adjust to a more appropriate position to ensure that the final outlet water temperature can accurately reach the set temperature; the differential coefficient focuses on the rate of change of the temperature difference. When the temperature changes too fast, a control signal will be generated to suppress this rapid change, prevent temperature overshoot, and make the water temperature approach the set temperature more smoothly.

[0070] Specifically, when optimizing the initial proportional coefficient, the initial integral coefficient, and the initial differential coefficient based on the temperature difference, adjustments are made in combination with factors such as the magnitude of the current temperature difference, the change trend, and the running time of the system; for example, if the temperature difference remains at a large value for a period of time and shows no tendency to decrease, the proportional coefficient and the integral coefficient may be appropriately increased to accelerate the adjustment speed and eliminate errors; at the same time, if the rate of change of the temperature difference suddenly increases, the differential coefficient may be correspondingly increased to enhance the stability of the system.

[0071] Preferably, when optimizing the initial proportional coefficient, the initial integral coefficient, and the initial differential coefficient based on the temperature difference, a fuzzy controller can be used to optimize the initial proportional coefficient, the initial integral coefficient, and the initial differential coefficient.

[0072] Preferably, the temperature difference, the initial proportional coefficient, the initial integral coefficient, and the initial differential coefficient are input into the fuzzy controller so that the fuzzy controller outputs the change amount of the proportional coefficient, the change amount of the integral coefficient, and the change amount of the differential coefficient. The change amount of the proportional coefficient is added to the initial proportional coefficient to obtain the optimized proportional coefficient; the change amount of the integral coefficient is added to the initial integral coefficient to obtain the optimized integral coefficient; the change amount of the differential coefficient is added to the initial differential coefficient to obtain the optimized differential coefficient.

[0073] Specifically, the real-time temperature difference, the optimized proportional coefficient, the optimized integral coefficient, and the optimized differential coefficient are input into the PID controller. The PID controller will calculate according to its internal mathematical model, and this calculation process comprehensively considers the functions of the proportional, integral, and differential links. For example, the proportional link calculates a preliminary adjustment amount based on the optimized proportional coefficient and the current temperature difference; the integral link calculates an additional adjustment amount based on the optimized integral coefficient and the accumulation of temperature deviations over a period of time in the past; the differential link calculates an adjustment amount to suppress overshoot or accelerate approaching the set temperature based on the optimized differential coefficient and the change rate of the temperature difference. Finally, the adjustment amounts of these three links are added together to obtain the correction mixing valve adjustment ratio. By continuously repeating this process, that is, continuously monitoring the temperature difference and the correction mixing valve adjustment ratio, the outlet water temperature gradually approaches and finally reaches the set temperature, achieving a stable constant temperature state and providing comfortable hot water supply for users.

[0074] In one embodiment, when the required instantaneous power is greater than the instantaneous power of the instant water heater and the instant water heater is turned on, the power of the instant water heater can be further adjusted to achieve the effect of rapid constant temperature through the adjustment of the instant water heater power and the position of the mixing valve.

[0075] In one embodiment, if the required instantaneous power is not greater than the instantaneous power of the instant water heater, the second mixing valve adjustment ratio corresponding to the required instantaneous power is obtained, and the position of the mixing valve is adjusted based on the second mixing valve adjustment ratio.

[0076] Specifically, if the required instantaneous power is not greater than the instantaneous power of the instant water heater, it means that the current heating capacity of the instant water heater is sufficient to meet the demand for heating water to the set temperature. Therefore, there is no need to additionally turn on the instant water heater, but instead, the mixing valve is directly adjusted to achieve rapid constant temperature.

[0077] Specifically, when obtaining the second mixing valve adjustment ratio corresponding to the required instantaneous power, by obtaining a preset mixing valve adjustment parameter association table, where the mixing valve adjustment parameter association table includes multiple sets of powers and the mixing valve adjustment ratios corresponding to the multiple sets of powers respectively; traversing the mixing valve adjustment parameter association table based on the required instantaneous power, determining the second target power in the mixing valve adjustment parameter association table that matches the required instantaneous power, and obtaining the second target mixing valve adjustment ratio corresponding to the second target power, and taking the second target mixing valve adjustment ratio as the second mixing valve adjustment ratio corresponding to the required instantaneous power.

[0078] Specifically, when adjusting the position of the mixing valve based on the second mixing valve adjustment ratio corresponding to the required instantaneous power, the spool position of the mixing valve is adjusted according to the second mixing valve adjustment ratio, so as to change the cross-sectional areas of the hot water channel and the cold water channel in the mixing valve, thereby realizing the mixing of cold and hot water in the corresponding proportion, meeting the user's demand for water temperature, initially stabilizing the outlet water temperature, and providing a good starting state for the subsequent fine adjustment based on the PID algorithm.

[0079] Embodiment 2, refer to Figure 2 , Figure 2 FIG. is a schematic structural diagram of an embodiment of a control system of a water heater for energy storage and heat exchange provided by the present application. Corresponding to the above control method of the water heater for energy storage and heat exchange, the present application also provides a control system of a water heater for energy storage and heat exchange. The control system of the water heater for energy storage and heat exchange includes a module for executing the above control method of the water heater for energy storage and heat exchange. The control system of the water heater for energy storage and heat exchange can be configured in terminals such as desktop computers, tablet computers, laptop computers, etc.; specifically, the control system of the water heater for energy storage and heat exchange includes a power calculation module 201, a first mixing valve fast adjustment module 202, and a mixing valve precise adjustment module 203.

[0080] The power calculation module 201 is configured to calculate the required instantaneous power based on the current inlet water temperature, the current water flow rate, and the preset temperature of the water heater for energy storage and heat exchange when it is detected that there is a water demand, and calculate the instantaneous power of the instant water heater based on the current voltage and the current current of the water heater for energy storage and heat exchange.

[0081] The first mixing valve fast adjustment module 202 is configured to, if the required instantaneous power is greater than the instantaneous power of the instant water heater, turn on the instant water heater, calculate the first adjustment power based on the required instantaneous power, and adjust the position of the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power.

[0082] The mixing valve precise adjustment module 203 is configured to calculate the temperature difference between the current outlet water temperature and the preset temperature, correct the first mixing valve adjustment ratio based on the temperature difference by using the PID algorithm, and adjust the position of the mixing valve based on the corrected mixing valve adjustment ratio until the current outlet water temperature meets the preset temperature.

[0083] In one embodiment, a control system of a water heater for energy storage and heat exchange provided by an embodiment of the present application further includes a second mixing valve fast adjustment module.

[0084] In one embodiment, the second mixing valve rapid adjustment module is configured to, if the required instantaneous power is not greater than the instantaneous power of the instant water heater, obtain the second mixing valve adjustment ratio corresponding to the required instantaneous power, and perform position adjustment on the mixing valve based on the second mixing valve adjustment ratio.

[0085] In one embodiment, the power calculation module 201 is configured to calculate the required instantaneous power based on the current inlet water temperature, the current water flow rate, and the preset temperature. Specifically, it includes: calculating the temperature difference between the current inlet water temperature and the preset temperature, inputting the temperature difference and the current water flow rate into a preset required instantaneous power calculation formula, and calculating the required instantaneous power. The preset required instantaneous power calculation formula is as follows:

[0086] ;

[0087] In the formula, is the instantaneous power, is the specific heat capacity of water, is the amount of water flowing through per unit time, is the temperature difference between the set temperature and the inlet water temperature, is the unit time.

[0088] In one embodiment, the first mixing valve rapid adjustment module 202 is configured to calculate the first adjustment power based on the required instantaneous power, and perform position adjustment on the mixing valve based on the first mixing valve adjustment ratio corresponding to the first adjustment power. Specifically, it includes: calculating the product of the preset target ratio and the required instantaneous power, and using the product as the first adjustment power; obtaining a preset mixing valve adjustment parameter association table, where the mixing valve adjustment parameter association table includes multiple groups of powers and the mixing valve adjustment ratios corresponding to the multiple groups of powers respectively; performing a traversal process on the mixing valve adjustment parameter association table based on the first adjustment power, determining the first target power in the mixing valve adjustment parameter association table that matches the first adjustment power, and obtaining the first target mixing valve adjustment ratio corresponding to the first target power, and using the first target mixing valve adjustment ratio as the first mixing valve adjustment ratio corresponding to the first adjustment power.

[0089] In one embodiment, the mixing valve precise adjustment module 203 is configured to correct the adjustment ratio of the first mixing valve based on the temperature difference by using a PID algorithm. Specifically, it includes: obtaining the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient of the PID controller; performing optimization processing on the initial proportional coefficient, the initial integral coefficient, and the initial derivative coefficient based on the temperature difference to obtain an optimized proportional coefficient, an optimized integral coefficient, and an optimized derivative coefficient; inputting the temperature difference, the optimized proportional coefficient, the optimized integral coefficient, and the optimized derivative coefficient into the PID controller, so that the PID controller outputs a proportional adjustment amount, and correcting the adjustment ratio of the first mixing valve based on the proportional adjustment amount to obtain a corrected mixing valve adjustment ratio.

[0090] In one embodiment, the control system of a water heater for energy storage heat exchange provided by the embodiments of the present application further includes a water demand detection module.

[0091] In one embodiment, the water demand detection module is configured to respectively perform a fault detection and a water volume detection of the water storage tank of the water heater for energy storage heat exchange. When it is detected that the water heater for energy storage heat exchange has no fault and the water volume of the water storage tank meets a preset water volume threshold of the water storage tank, perform a water demand detection on the water heater for energy storage heat exchange based on the water valve; when it is detected based on the water valve that the current water flow rate is not zero, determine that there is a current water demand.

[0092] In one embodiment, the water demand detection module is configured to perform a fault detection on the water heater for energy storage heat exchange. Specifically, it includes: after detecting that the water heater for energy storage heat exchange is powered on, performing a fault detection on each module circuit in the water heater for energy storage heat exchange. When a fault is detected in the target module circuit, generating a fault code corresponding to the target module circuit and displaying the fault code on the display module of the water heater for energy storage heat exchange.

[0093] In one embodiment, the water demand detection module is configured to perform a water volume detection of the water storage tank of the water heater for energy storage heat exchange. Specifically, it includes: obtaining the water volume of the water storage tank. When the water volume of the water storage tank does not meet the preset water volume threshold of the water storage tank, automatically replenish water to the water storage tank until the water volume of the water storage tank meets the preset water volume threshold; obtaining the water storage temperature of the water storage tank. When the water storage temperature does not meet the preset water storage temperature threshold, heating the water stored in the water storage tank until the water storage temperature meets the preset water storage temperature threshold, and stopping heating the water stored in the water storage tank; continuously obtaining the current water storage temperature of the water storage tank. When it is detected that the current water storage temperature of the water storage tank drops from the preset water storage temperature threshold to a preset deadband temperature, heating the water stored in the water storage tank again.

[0094] The control system of the water heater for energy storage and heat exchange can implement the control method of the water heater for energy storage and heat exchange in the above method embodiment. The optional items in the above method embodiment are also applicable to this embodiment and will not be elaborated here.

[0095] Embodiment 3, refer to Figure 3 , Figure 3 is a schematic structural diagram of an embodiment of a water heater for energy storage and heat exchange provided by the present application. As Figure 3 shown, the water heater for energy storage and heat exchange includes a water valve 31, a water storage tank 32, a mixing valve 33, an instant heater 34, and the control system 35 of the water heater for energy storage and heat exchange described in the above Embodiment 2, specifically as follows:

[0096] In one embodiment, the water valve 31, the water storage tank 32, the mixing valve 33, and the instant heater 34 are respectively connected to the control system 35.

[0097] As Figure 4 shown, Figure 4 is another schematic structural diagram of an embodiment of a water heater for energy storage and heat exchange provided by the present application.

[0098] In one embodiment, the water outlet end of the water valve 31 is respectively connected to the water inlet end of the water storage tank 32 and the first water inlet end of the mixing valve 33, the water outlet end of the water storage tank 32 is connected to the second water inlet end of the mixing valve 33, and the water outlet end of the mixing valve 33 is connected to the water inlet end of the instant heater 34.

[0099] Specifically, the first water inlet end of the mixing valve 33 is the cold water inlet end, and the second water inlet end of the mixing valve 33 is the hot water inlet end.

[0100] In one embodiment, the water heater for energy storage and heat exchange further includes a water inlet 36 and a water outlet 37.

[0101] Specifically, the water inlet 36 is connected to the water inlet end of the water valve 31, and the water outlet end of the instant heater 34 is connected to the water outlet 37.

[0102] In one embodiment, the water heater for energy storage and heat exchange further includes a temperature probe. Among them, the temperature probe includes, but is not limited to, an inlet water temperature probe 381, a stored water temperature probe 382, a mixed water temperature probe 383, and an outlet water temperature probe 384.

[0103] Specifically, the inlet water temperature probe 381 is arranged at the water outlet end of the water inlet 36, and the inlet water temperature probe 381 is used to detect the temperature of the water entering the water valve 31.

[0104] Specifically, the water storage temperature probe 382 is disposed at the water storage tank 32, and the water storage temperature probe 382 is used to detect the water storage temperature in the water storage tank 32.

[0105] Specifically, the mixed water temperature probe 383 is disposed at the water outlet end of the mixing valve 33, and the mixed water temperature probe 383 is used to detect the water outlet temperature of the mixing valve 33.

[0106] Specifically, the water outlet temperature probe 384 is disposed at the water outlet end of the instant water heater 34, and the water outlet temperature probe 384 is used to detect the water outlet temperature of the instant water heater 34.

[0107] As Figure 5 shown, Figure 5 is a schematic structural diagram of an electronic device provided by the present application; it includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114. Among them, the processor 111, the communication interface 112, and the memory 113 complete mutual communication through the communication bus 114, and the memory 113 is used to store a computer program.

[0108] In an embodiment of the present application, when the processor 111 is used to execute the program stored on the memory 113, it implements the control method of the water heater for energy storage and heat exchange provided by any one of the foregoing method embodiments.

[0109] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a storage medium, and the storage medium is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the flow steps of the method embodiments of the above method.

[0110] Therefore, the embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the control method of the water heater for energy storage and heat exchange provided by any one of the foregoing method embodiments.

[0111] The storage medium is a physical and non-transitory storage medium, for example, it can be various physical storage media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disc that can store program codes. The computer-readable storage medium can be non-volatile or volatile.

[0112] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described in terms of function in the above description. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0113] In several embodiments provided by this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of each unit is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0114] The steps in the method embodiments of this application can be adjusted, combined, and deleted according to actual needs. The units in the system embodiments of this application can be combined, divided, and deleted according to actual needs. In addition, the functional units in each embodiment of this application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0115] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application.

[0116] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailedly described in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

[0118] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A control method for a water heater for energy storage and heat exchange, characterized in that: The energy storage heat exchange water heater comprises a water mixing valve and an instant heater, wherein the control method comprises: When water demand is detected, the instantaneous power required is calculated based on the current water inlet temperature, current water flow rate and preset temperature of the energy storage heat exchange water heater, and the instantaneous power of the instantaneous heater is calculated based on the current voltage and current current of the energy storage heat exchange water heater; wherein the water outlet end of the mixing valve is connected to the water inlet end of the instantaneous heater; If the required instantaneous power is greater than the instantaneous power of the instantaneous heating heater, the instantaneous heating heater is turned on, a first adjustment power is calculated based on the required instantaneous power, and a position of the mixing valve is adjusted based on a first mixing valve adjustment ratio corresponding to the first adjustment power; Calculating the temperature difference between the current outlet water temperature and the preset temperature, based on the temperature difference, using a PID algorithm to correct the adjustment ratio of the first water mixing valve, and based on the corrected adjustment ratio of the water mixing valve, adjusting the position of the water mixing valve until the current outlet water temperature meets the preset temperature; If the required instantaneous power is not greater than the instantaneous power of the instantaneous heater, obtaining a second water mixing valve adjustment ratio corresponding to the required instantaneous power, and adjusting the position of the water mixing valve based on the second water mixing valve adjustment ratio; The calculating of the first regulating power based on the required instantaneous power and adjusting the position of the mixing valve based on the first mixing valve regulating ratio corresponding to the first regulating power specifically include: Calculating the product of the preset target ratio and the required instantaneous power, and using the product as the first regulated power; Obtaining a preset water mixing valve adjustment parameter association table, wherein the water mixing valve adjustment parameter association table includes multiple groups of power and the water mixing valve adjustment ratios corresponding to the multiple groups of power; The mixing valve adjustment parameter association table is traversed based on the first adjustment power to determine a first target power in the mixing valve adjustment parameter association table that matches the first adjustment power, and a first target mixing valve adjustment ratio corresponding to the first target power is obtained, and the first target mixing valve adjustment ratio is used as the first mixing valve adjustment ratio corresponding to the first adjustment power.

2. The method according to claim 1, characterized in that Calculating the required instantaneous power based on the current inlet water temperature, the current water flow rate and the preset temperature, specifically includes: The temperature difference between the current water inlet temperature and the preset temperature is calculated, and the temperature difference and the current water flow are input into a preset calculation formula for instantaneous power demand to calculate the instantaneous power demand, wherein the preset calculation formula for instantaneous power demand is as follows: ； In the formula, is the instantaneous power, is the specific heat of water, is the amount of water flowing per unit time, is the temperature difference between the set temperature and the inlet water temperature. It is the unit time.

3. The method according to claim 1, characterized in that: Based on the temperature difference, a PID algorithm is used to correct the adjustment ratio of the first mixing valve, specifically including: Get the initial proportional coefficient, initial integral coefficient and initial differential coefficient of the PID controller; Optimizing the initial proportional coefficient, the initial integral coefficient and the initial differential coefficient based on the temperature difference to obtain an optimized proportional coefficient, an optimized integral coefficient and an optimized differential coefficient; The temperature difference, the optimized proportional coefficient, the optimized integral coefficient and the optimized differential coefficient are input into the PID controller so that the PID controller outputs a proportional adjustment amount, and the first water mixing valve adjustment ratio is corrected based on the proportional adjustment amount to obtain a corrected water mixing valve adjustment ratio.

4. The method according to claim 1, characterized in that: The energy storage heat exchange water heater further includes a water storage tank and a water valve, wherein the control method further includes: respectively performing fault detection and water level detection of the energy storage heat exchange water heater, and when it is detected that the energy storage heat exchange water heater has no fault and the water level of the water tank meets a preset water level threshold of the water tank, performing water demand detection on the energy storage heat exchange water heater based on the water valve; When it is detected based on the water valve that the current water flow rate meets a preset water flow rate threshold, it is determined that there is a current water demand.

5. The method according to claim 4, characterized in that Performing fault detection on the energy storage heat exchange water heater specifically includes: After detecting that the energy storage heat exchange water heater is powered on, fault detection is performed on each module circuit in the energy storage heat exchange water heater. When a fault is detected in a target module circuit, a fault code corresponding to the target module circuit is generated and displayed on a display module of the energy storage heat exchange water heater.

6. The method according to claim 4, characterized in that The water level detection of the water tank of the energy storage heat exchange water heater specifically includes: Obtaining the water volume of the water tank, and when the water volume of the water tank does not meet a preset water volume threshold, automatically replenishing the water tank until the water volume of the water tank meets the preset water volume threshold; Acquire the water storage temperature of the water storage tank, and when the water storage temperature does not meet the preset water storage temperature threshold, heat the water in the water storage tank until the water storage temperature meets the preset water storage temperature threshold, and stop heating the water in the water storage tank; The current water storage temperature of the water storage tank is continuously obtained, and when it is detected that the current water storage temperature of the water storage tank drops from the preset water storage temperature threshold to the preset return temperature, the water in the water storage tank is reheated.

7. A control system for a water heater for energy storage and heat exchange, characterized in that: The control method for the energy storage heat exchange water heater according to any one of claims 1 to 6, wherein the control system comprises a power calculation module, a first mixing valve fast adjustment module and a mixing valve precise adjustment module; The power calculation module is used to calculate the required instantaneous power based on the current water inlet temperature, current water flow rate and preset temperature of the energy storage heat exchange water heater when water demand is detected, and calculate the instantaneous power of the instantaneous heater based on the current voltage and current current of the energy storage heat exchange water heater; The first water mixing valve fast adjustment module is used to turn on the instantaneous heating heater if the required instantaneous power is greater than the instantaneous power of the instantaneous heating heater, calculate a first adjustment power based on the required instantaneous power, and adjust the position of the water mixing valve based on the first water mixing valve adjustment ratio corresponding to the first adjustment power; The mixing valve precise adjustment module is used to calculate the temperature difference between the current water outlet temperature and the preset temperature, and based on the temperature difference, use the PID algorithm to correct the adjustment ratio of the first mixing valve, and based on the corrected mixing valve adjustment ratio, adjust the position of the mixing valve until the current water outlet temperature meets the preset temperature.

8. A water heater for energy storage and heat exchange, characterized in that: A control system comprising a water valve, a water storage tank, a water mixing valve, an instant heater and the energy storage heat exchange water heater according to claim 7; Wherein, the water valve, the water storage tank, the water mixing valve and the instant heater are respectively connected to the control system; The water outlet of the water valve is respectively connected to the water inlet of the water tank and the first water inlet of the mixing valve, the water outlet of the water tank is connected to the second water inlet of the mixing valve, and the water outlet of the mixing valve is connected to the water inlet of the instant heater.

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