Water heater for energy storage and heat exchange and control method and system thereof

Abstract

The invention relates to the technical field of electric water heaters, and particularly discloses a water heater for energy storage and heat exchange and a control method and system.The control method comprises the steps that the required instantaneous power is calculated based on the current water inlet temperature, the current water flow and the preset temperature of the water heater for energy storage and heat exchange, and the required instantaneous power is calculated based on the current voltage and current of the water heater for energy storage and heat exchange; calculating the instantaneous power of the instantaneous heater; if the required instantaneous power is larger than the instantaneous power of the instant heater, the instant heater is started, first adjusting power is calculated based on the required instantaneous power, and the position of a water mixing valve is adjusted based on the first water mixing valve adjusting proportion of the first adjusting power; based on the temperature difference value between the current outlet water temperature and the preset temperature, a PID algorithm is adopted to correct the first water mixing valve adjusting proportion, and based on the corrected water mixing valve adjusting proportion, the position of the water mixing valve is adjusted till the current outlet water temperature meets the preset temperature; the water heater for energy storage and heat exchange can achieve rapid constant temperature while saving energy.

Description

Technical Field

[0001] The present application relates to the technical field of electric water heaters, and in particular to a water heater for energy storage and heat exchange and a control method and system thereof. Background Art

[0002] Existing electric water heaters are mainly divided into three types: storage type electric heating, rapid heating type and energy storage type electric water heaters; the water temperature of the water tank of the storage type electric water heater can be set, but the user needs to heat the water in the tank in advance before using the water, and mix the water through a mixing valve to meet the water temperature requirements; the rapid heating type electric water heater controls the power of the heating module through a thyristor according to the temperature set by the user, and quickly heats the water flow; the energy storage type electric water heater takes into account both heat storage and rapid heating functions, and can quickly and in large quantities of water according to the water outlet temperature set by the user.

[0003] However, the current control scheme for energy storage electric water heaters is relatively simple. Usually, the energy storage medium is heated to a certain temperature first, and then the heat is transferred to the water through heat exchange. This process has a slow heating speed and it is difficult to quickly reach a constant temperature state. There is a lack of a systematic water energy storage control scheme, and it does not have obvious advantages in energy saving and rapid constant temperature.

[0004] In addition, the existing phase change material energy storage and heat exchange control schemes have deficiencies in the control logic of energy storage control and constant temperature water outlet. For example, in the process of phase change material transferring heat to water, due to the limited heat transfer coefficient between the two, the heat may not be transferred to the water flow quickly and effectively, so that the outlet water temperature cannot quickly reach the set constant temperature value. In addition, the thermal conductivity of most phase change materials is low, and the heat transfer rate is slow during the energy storage process, resulting in long energy storage time and low efficiency, which easily leads to the failure to achieve the goal of energy saving, rapid constant temperature, and on-demand energy storage to save energy consumption. Summary of the invention

[0005] The present application provides an energy storage heat exchange water heater and a control method and system thereof, which can enable the energy storage heat exchange water heater to achieve rapid constant temperature while saving energy.

[0006] In a first aspect, the present application provides a control method for an energy storage heat exchange water heater, wherein the energy storage heat exchange water heater includes a mixing valve and an instantaneous heater, wherein the control method includes: when water demand is detected, based on the current water inlet temperature, current water flow rate and preset temperature of the energy storage heat exchange water heater, the required instantaneous power is calculated, and based on the current voltage and current current of the energy storage heat exchange water heater, the instantaneous power of the instantaneous heater is calculated; if the required instantaneous power is greater than the instantaneous power of the instantaneous heater, the instantaneous heater is turned on, a first adjustment power is calculated based on the required instantaneous power, and the position of the mixing valve is adjusted based on a first mixing valve adjustment ratio corresponding to the first adjustment power; the temperature difference between the current water outlet temperature and the preset temperature is calculated, based on the temperature difference, the first mixing valve adjustment ratio is corrected using a PID algorithm, and the position of the mixing valve is adjusted based on the corrected mixing valve adjustment ratio until the current water outlet temperature meets the preset temperature.

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

[0008] In a possible implementation, the instantaneous power requirement is calculated based on the current water inlet temperature, the current water flow rate and the preset temperature, specifically including: calculating the temperature difference between the current water inlet temperature and the preset temperature, inputting the temperature difference and the current water flow rate into a preset instantaneous power requirement calculation formula, and calculating the instantaneous power requirement, wherein the preset instantaneous power requirement calculation formula 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.

[0009] In a possible implementation, a first regulating power is calculated based on the required instantaneous power, and a position of the mixing valve is adjusted based on a first mixing valve regulation ratio corresponding to the first regulating power, specifically including: calculating the product of a preset target ratio and the required instantaneous power, and using the product as the first regulating power; obtaining a preset mixing valve regulation parameter association table, wherein the mixing valve regulation parameter association table includes multiple groups of powers and mixing valve regulation ratios corresponding to each of the multiple groups of powers; traversing the mixing valve regulation parameter association table based on the first regulating power, determining a first target power in the mixing valve regulation parameter association table that matches the first regulating power, and obtaining a first target mixing valve regulation ratio corresponding to the first target power, and using the first target mixing valve regulation ratio as the first mixing valve regulation ratio corresponding to the first regulating power.

[0010] In a possible implementation, based on the temperature difference, a PID algorithm is used to correct the adjustment ratio of the first mixing valve, specifically including: obtaining an initial proportional coefficient, an initial integral coefficient and an 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; inputting the temperature difference, the optimized proportional coefficient, the optimized integral coefficient and the optimized differential 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.

[0011] In a possible implementation, the present application provides a control method for an energy storage heat exchange water heater, wherein the energy storage heat exchange water heater also includes a water tank and a water valve, wherein the control method further includes: performing fault detection and water tank water level detection on the energy storage heat exchange water heater, respectively, and when it is detected that the energy storage heat exchange water heater has no fault and the water level in the water tank meets a preset water tank water level threshold, 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 the preset water flow rate threshold, it is determined that there is currently a water demand.

[0012] In a possible implementation, fault detection is performed on the energy storage heat exchange water heater, specifically including: after detecting that the energy storage heat exchange water heater is powered on, performing fault detection on each module circuit in the energy storage heat exchange water heater, and 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 energy storage heat exchange water heater.

[0013] In a possible implementation, the water level in the water tank of the energy storage heat exchange water heater is detected, specifically including: obtaining the water level in the water tank of the water tank, and when the water level in the water tank does not meet a preset water level threshold, automatically replenishing the water tank until the water level in the water tank meets the preset water level threshold; obtaining the water temperature of the water tank, and when the water temperature does not meet the preset water temperature threshold, heating the water in the water tank until the water temperature meets the preset water temperature threshold, and stopping heating the water in the water tank; continuously obtaining the current water temperature of the water tank, and when it is detected that the current water temperature of the water tank drops from the preset water temperature threshold to the preset hysteresis temperature, reheating the water in the water tank.

[0014] In a second aspect, the present application provides a control system for an energy storage heat exchange water heater, comprising a power calculation module, a first water mixing valve fast adjustment module and a water mixing valve precise adjustment module; wherein 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 heater if the required instantaneous power is greater than the instantaneous power of the instantaneous heater, calculate the 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 water 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 a PID algorithm to correct the first water mixing valve adjustment ratio, and adjust the position of the water mixing valve based on the corrected water mixing valve adjustment ratio until the current water outlet temperature meets the preset temperature.

[0015] In a third aspect, the present application provides an energy storage and heat exchange water heater, comprising a water valve, a water tank, a mixing valve, an instant heater and a control system for the energy storage and heat exchange water heater described above; wherein the water valve, the water tank, the mixing valve and the instant 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 tank and the first water inlet end of the mixing valve, the water outlet end of the water 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 heater.

[0016] In a fourth aspect, an embodiment of the present application further provides a computer device, which includes a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above-mentioned control method when executing the computer program.

[0017] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program can implement the above-mentioned control method when executed by a processor. The present application provides a water heater for energy storage and heat exchange and a control method and system thereof, which have the following advantages over the prior art: When water demand is detected, the required instantaneous power is calculated according to the current water inlet temperature, water flow rate and preset temperature, and compared with the instantaneous power of the instantaneous heater calculated based on the current voltage and current current. If the required instantaneous power is greater than the instantaneous power of the instantaneous heater, the instantaneous heater is turned on, and the first adjustment power is calculated based on the required instantaneous power, and the position of the mixing valve is roughly adjusted based on the first mixing valve adjustment ratio corresponding to the first adjustment power; so that the water heater can respond quickly at the moment of water use, preliminarily adjust the mixing ratio of cold and hot water, and quickly provide users with hot water close to the preset temperature, which greatly shortens the time waiting for the hot water to reach the appropriate temperature and improves the slow heating speed and difficulty of traditional energy storage electric water heaters. The problem of rapid constant temperature is solved; subsequently, the difference between the current water outlet temperature and the preset temperature is calculated, and the PID algorithm is used to correct the adjustment ratio of the first mixing valve. Based on the correction of the mixing valve adjustment ratio, the position of the mixing valve is fine-tuned, and the water temperature deviation after coarse adjustment can be finely compensated, so that the current water outlet temperature can be accurately stabilized at the preset temperature, which effectively solves the problem that the water outlet temperature is difficult to quickly reach and maintain a constant temperature in the prior art; and the approximate adjustment ratio of the first mixing valve is first determined by coarse adjustment, which can reduce the power consumption of the instant heater, and then the water outlet temperature is accurately controlled by fine adjustment, which can further optimize the energy utilization efficiency, so that the water heater can save energy while more efficiently meeting the user's demand for rapid constant temperature hot water. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 It is a flow chart of an embodiment of a control method for an energy storage heat exchange water heater provided by the present application; Figure 2 It is a structural schematic diagram of an embodiment of a control system of an energy storage heat exchange water heater provided by the present application; Figure 3 It is a structural schematic diagram of an embodiment of an energy storage heat exchange water heater provided by the present application; Figure 4 This is another structural schematic diagram of an embodiment of an energy storage heat exchange water heater provided by the present application; Figure 5 It is a structural schematic diagram of an electronic device provided by this application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The disclosure below provides many different embodiments or examples to implement the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers 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.

[0023] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0025] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0026] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context. Example 1, see Figure 1 , Figure 1 1 is a flow chart of an embodiment of a control method for a heat storage water heater provided by the present application. The control method is used for a heat storage water heater, wherein the heat storage water heater comprises a mixing valve, an instant heater, a water storage tank and a water valve. Figure 1 As shown, the control method includes steps 101 to 103, which are specifically as follows: Step 101: When water demand is detected, the required instantaneous power 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.

[0027] In one embodiment, the energy storage heat exchange water heater is subjected to fault detection and water level detection in the water tank is performed respectively.

[0028] Specifically, since fault detection of the energy storage heat exchange water heater is a necessary step to ensure safe use and normal operation of the system, and the water tank is used as a storage and supply source for hot water, whether the water volume is sufficient is directly related to whether the user's water demand can be met. Therefore, after the energy storage heat exchange water heater is powered on, it is necessary to first perform fault detection on the energy storage heat exchange water heater and water volume detection on the water tank.

[0029] In one embodiment, fault detection is performed on the energy storage heat exchange water heater, specifically including: 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, and when a fault is detected in a target module circuit, a fault code corresponding to the target module circuit is generated, and the fault code is displayed on a display module of the energy storage heat exchange water heater.

[0030] Specifically, the various module circuits include but are not limited to a temperature sensor circuit, a water mixing valve circuit, an operator communication circuit, and the like.

[0031] Specifically, when performing fault detection on the temperature sensor circuit, the resistance value or output voltage of the temperature sensor can be measured using a detection resistor or other detection element in the temperature sensor circuit to determine whether the temperature sensor is short-circuited or open-circuited.

[0032] Specifically, when fault detection is performed on the mixing valve circuit, the feedback of the reset signal thereof may be checked to determine whether the mixing valve can be reset normally, thereby determining whether the mixing valve is faulty.

[0033] Specifically, when performing fault detection on the operator communication circuit, whether the operator is faulty is determined by detecting whether data can be received and sent normally.

[0034] Specifically, when a fault is detected in the target module circuit, the system will immediately generate a corresponding fault code; wherein the fault code is pre-set, and each fault code uniquely corresponds to a specific fault type; and based on the fault code, the fault can be quickly located.

[0035] Preferably, when a fault is detected in the temperature sensor circuit, a fault code E1 corresponding to the temperature sensor circuit is generated; when a fault is detected in the mixing valve circuit, a fault code E2 corresponding to the mixing valve circuit is generated; when a fault is detected in the operator communication circuit, a fault code E3 corresponding to the operator communication circuit is generated.

[0036] Specifically, by performing a self-check on the energy storage heat exchange water heater immediately after power-on, faults can be discovered and displayed in a timely manner. At this time, the heating function is turned off to avoid operation in a faulty state, ensuring that the system is in a safe and operable state, laying the foundation for subsequent normal use.

[0037] In one embodiment, when the water level in the water tank of the energy storage heat exchange water heater is detected, the water level in the water tank is obtained. When the water level in the water tank does not meet a preset water level threshold, the water tank is automatically replenished until the water level in the water tank meets the preset water level threshold; the water temperature of the water tank is obtained. When the water temperature does not meet the preset water temperature threshold, the water in the water tank is heated until the water temperature meets the preset water temperature threshold, and the heating of the water in the water tank is stopped; the current water temperature of the water tank is continuously obtained. When it is detected that the current water temperature of the water tank drops from the preset water temperature threshold to the preset hysteresis temperature, the water in the water tank is heated again.

[0038] Specifically, the water volume of the water tank is obtained based on the liquid level sensor. When it is detected that the water volume of the water tank is lower than a preset water volume threshold, it is determined that the water volume of the water tank does not meet the preset water volume threshold, and an automatic water replenishment program for the water tank is started, wherein the automatic water replenishment program for the water tank controls the water valve in the energy storage heat exchange water heater to open so that an external water source flows into the water tank through the water valve until the liquid level sensor detects that the water volume of the water tank is not lower than the preset water volume threshold, that is, the water volume of the water tank meets the preset water volume threshold, and the automatic water replenishment program for the water tank is turned off to close the water valve; this ensures that at any time, the water tank has sufficient water to meet the user's potential water demand, avoids interruption of hot water supply due to insufficient water, and maintains the basic operating functions of the system.

[0039] Specifically, a water storage temperature probe is arranged in the water storage tank so that the water storage temperature of the water storage tank is obtained based on the water storage temperature probe.

[0040] 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 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 to heat the water to prevent energy waste caused by excessive heating.

[0041] Specifically, the preset hysteresis temperature is a parameter that allows the water storage temperature to fluctuate within a certain range; when the water storage temperature drops from the preset water storage temperature threshold to the hysteresis temperature, it means that the water storage temperature in the water tank is insufficient, and the heating program needs to be started again; this control method based on the hysteresis temperature can not only avoid frequent small temperature fluctuations that trigger heating, reduce the number of starts and stops of the heater, and extend the service life of the equipment, but also ensure that when the water storage temperature does drop to a level that may affect the quality of hot water supply, heat is replenished in time, providing users with continuous and stable hot water, especially for users with more family members and continuous bathing time, effectively ensuring a comfortable user experience and achieving a good balance between energy saving and practicality.

[0042] Preferably, the user can set the water storage temperature and the hysteresis temperature according to the household water use situation; if the user's family has few people and the bathing time is not continuous, the water storage temperature can be set lower, and the temperature difference between the preset water storage temperature and the hysteresis temperature can be set larger, which can reduce the energy waste of heat storage and save electricity; if the user's family has many people and the bathing time is continuous, the water storage temperature can be set higher, and the temperature difference between the preset water storage temperature and the hysteresis temperature can be set smaller.

[0043] In one embodiment, when it is detected that there is no fault in the energy storage heat exchange water heater and the water level in the water tank meets a preset water level threshold of the water tank, the water demand of the energy storage heat exchange water heater is detected based on the water valve; when it is detected based on the water valve that the current water flow meets the preset water flow threshold, it is determined that there is currently a water demand.

[0044] Specifically, after the water heater is turned on and the fault and water level in the water tank are detected, the water valve is always in a detection state to detect whether someone is turning on the hot water for use. When the water valve detects that water is passing through, the current water flow rate is compared 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 demand for water. 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 water valve-based detection method is simple, direct, accurate and efficient, and can quickly capture the user's water use intention, and realize the rapid switching of the system from standby to working state, ensuring that users can obtain hot water at an appropriate temperature in a timely manner.

[0045] In one embodiment, when calculating the required instantaneous power based on the current water inlet temperature, the current water flow rate and the preset temperature, the temperature difference between the current water inlet temperature and the preset temperature is calculated, and the temperature difference and the current water flow rate are input into a preset required instantaneous power calculation formula to calculate the required instantaneous power, wherein the preset required instantaneous power calculation formula 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.

[0046] In one embodiment, when calculating the instantaneous power of the instantaneous heater based on the current voltage and current current of the energy storage heat exchange water heater, the product of the current voltage and the current current is calculated and used as the instantaneous power of the instantaneous heater.

[0047] Step 102: If the required instantaneous power is greater than the instantaneous power of the instantaneous heater, the instantaneous heater is turned on, 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.

[0048] In one embodiment, the required instantaneous power is greater than the instantaneous power of the instantaneous heater, indicating that the current power of the instantaneous heater alone 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 instantaneous heater at the same time.

[0049] In one embodiment, a first regulating power is calculated based on the required instantaneous power, and based on the first water mixing valve regulating ratio corresponding to the first regulating power, when the position of the water mixing valve is adjusted, the product of a preset target ratio and the required instantaneous power is calculated, and the product is used as the first regulating power; a preset water mixing valve regulating parameter association table is obtained, wherein the water mixing valve regulating parameter association table includes multiple groups of power and the water mixing valve regulating ratios corresponding to the multiple groups of power; the water mixing valve regulating parameter association table is traversed based on the first regulating power to determine the first target power in the water mixing valve regulating parameter association table that matches the first regulating power, and the first target water mixing valve regulating ratio corresponding to the first target power is obtained, and the first target water mixing valve regulating ratio is used as the first water mixing valve regulating ratio corresponding to the first regulating power.

[0050] Specifically, the preset target ratio is 95%. When the required instantaneous power is P, 95%P is used as the first adjustment power.

[0051] Preferably, the preset target ratio may also be set to other target ratio values ​​according to user requirements.

[0052] Specifically, the function of the mixing valve is to adjust the ratio of water and cold water that have passed through the heat storage tank for heat exchange, so as to accurately control the mixed water temperature; therefore, the mixing valve adjustment parameter association table is established in advance, and the relationship between different power values ​​and their corresponding mixing valve adjustment ratios is recorded through the mixing valve adjustment parameter association table, and the 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 mixing valve adjustment parameter association table, so that the adjustment of the mixing valve can be based on the real-time demand instantaneous power, thereby more accurately controlling the mixing ratio of hot and cold water, which helps to quickly reach and stably output the water temperature expected by the user.

[0053] Specifically, based on the first mixing valve adjustment ratio corresponding to the first adjustment power, when the position of the mixing valve is adjusted, the valve core position of the mixing valve is adjusted based on 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 achieving a corresponding proportion of hot and cold water mixing, meeting the user's demand for water temperature, preliminarily stabilizing the outlet water temperature, and providing a good starting state for subsequent fine-tuning based on the PID algorithm.

[0054] Step 103: Calculate the temperature difference between the current water outlet temperature and the preset temperature, and based on the temperature difference, use a PID algorithm to correct the adjustment ratio of the first water mixing valve, and based on the corrected water mixing valve adjustment ratio, adjust the position of the water mixing valve until the current water outlet temperature meets the preset temperature.

[0055] In one embodiment, when the PID algorithm is used to correct the adjustment ratio of the first mixing valve, the initial proportional coefficient, initial integral coefficient and initial differential coefficient of the PID controller are obtained; the initial proportional coefficient, initial integral coefficient and initial differential coefficient are optimized based on the temperature difference to obtain the optimized proportional coefficient, optimized integral coefficient and 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 adjustment ratio of the first mixing valve is corrected based on the proportional adjustment amount to obtain a corrected mixing valve adjustment ratio.

[0056] Specifically, the initial proportional coefficient of the PID controller is , initial integration coefficient and the initial differential coefficient It is determined based on 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 water outlet temperature; for example, when the temperature difference is large, the mixing valve adjustment ratio is increased to quickly respond to temperature deviations; 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, if there is a continuous deviation, the integral term will continue to accumulate, so that the mixing valve will gradually adjust to a more appropriate position, ensuring that the final water outlet 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 quickly, a control signal will be generated to suppress this rapid change, prevent temperature overshoot, and make the water temperature more steadily approach the set temperature.

[0057] Specifically, when the initial proportional coefficient, the initial integral coefficient and the initial differential coefficient are optimized based on the temperature difference, adjustments are made in combination with factors such as the size of the current temperature difference, the change trend and the system operation time; for example, if the temperature difference remains at a large value for a period of time and there is no trend of decrease, the proportional coefficient and the integral coefficient may be appropriately increased to speed up 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 increased accordingly to enhance the stability of the system.

[0058] Preferably, when the initial proportional coefficient, the initial integral coefficient and the initial differential coefficient are optimized 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.

[0059] Preferably, the temperature difference is input into the fuzzy controller for the initial proportional coefficient, the initial integral coefficient and the initial differential coefficient, so that the fuzzy controller outputs the change of the proportional coefficient, the change of the integral coefficient and the change of the differential coefficient, and the change of the proportional coefficient is added to the initial proportional coefficient to obtain the optimized proportional coefficient; the change of the integral coefficient is added to the initial integral coefficient to obtain the optimized integral coefficient; the change of the differential coefficient is added to the initial differential coefficient to obtain the optimized differential coefficient.

[0060] Specifically, the real-time temperature difference and the optimized proportional coefficient, optimized integral coefficient and optimized differential coefficient are input into the PID controller, and the PID controller will perform calculations according to its internal mathematical model. This calculation process comprehensively considers the effects of the three links of proportion, integration and differentiation; for example, the proportional link calculates a preliminary adjustment amount according to the optimized proportional coefficient and the current temperature difference; the integral link calculates an additional adjustment amount according to the optimized integral coefficient and the accumulated temperature deviation over the past period of time; the differential link calculates an adjustment amount that suppresses overshoot or accelerates the approach to the set temperature according to the optimized differential coefficient and the rate of change of the temperature difference; finally, the adjustment amounts of these three links are added together to obtain the corrected mixing valve adjustment ratio; by continuously repeating this process, that is, continuously monitoring the temperature difference and correcting the mixing valve adjustment ratio, the outlet water temperature gradually approaches and eventually reaches the set temperature, achieving a stable constant temperature state, and providing users with comfortable hot water supply.

[0061] In one embodiment, when the required instantaneous power is greater than the instantaneous power of the instantaneous heater and the instantaneous heater is turned on, the power of the instantaneous heater can be further adjusted to achieve a rapid constant temperature effect by adjusting the power of the instantaneous heater and the position of the mixing valve.

[0062] In one embodiment, if the required instantaneous power is not greater than the instantaneous power of the instantaneous heater, a second water mixing valve adjustment ratio corresponding to the required instantaneous power is obtained, and the position of the water mixing valve is adjusted based on the second water mixing valve adjustment ratio.

[0063] Specifically, if the required instantaneous power is not greater than the instantaneous power of the instantaneous heater, it means that the current heating capacity of the instantaneous heater is sufficient to meet the demand of heating water to the set temperature; therefore, there is no need to turn on the instantaneous heater additionally, but the rapid constant temperature can be achieved directly by adjusting the mixing valve.

[0064] Specifically, when obtaining the second water mixing valve adjustment ratio corresponding to the required instantaneous power, a preset water mixing valve adjustment parameter association table is obtained, wherein the water mixing valve adjustment parameter association table includes multiple groups of powers and the water mixing valve adjustment ratios corresponding to each of the multiple groups of powers; the water mixing valve adjustment parameter association table is traversed based on the required instantaneous power, the second target power in the water mixing valve adjustment parameter association table that matches the required instantaneous power is determined, and the second target water mixing valve adjustment ratio corresponding to the second target power is obtained, and the second target water mixing valve adjustment ratio is used as the second water mixing valve adjustment ratio corresponding to the required instantaneous power.

[0065] Specifically, based on the adjustment ratio of the second mixing valve corresponding to the required instantaneous power, when the position of the mixing valve is adjusted, the valve core position of the mixing valve is adjusted based on the adjustment ratio of the second mixing valve to change the cross-sectional areas of the hot water channel and the cold water channel in the mixing valve, thereby achieving a corresponding proportion of hot and cold water mixing, meeting the user's demand for water temperature, preliminarily stabilizing the outlet water temperature, and providing a good starting state for subsequent fine-tuning based on the PID algorithm.

[0066] Example 2, see Figure 2 , Figure 2 It is a structural schematic diagram of an embodiment of a control system of an energy storage heat exchange water heater provided by the present application. Corresponding to the above control method of the energy storage heat exchange water heater, the present application also provides a control system of an energy storage heat exchange water heater. The control system of the energy storage heat exchange water heater includes a module for executing the above control method of the energy storage heat exchange water heater, and the control system of the energy storage heat exchange water heater can be configured in a desktop computer, a tablet computer, a laptop, and other terminals; specifically, the control system of the energy storage heat exchange water heater includes a power calculation module 201, a first mixing valve fast adjustment module 202, and a mixing valve precise adjustment module 203.

[0067] The power calculation module 201 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.

[0068] The first water mixing valve quick adjustment module 202 is used to turn on the instantaneous heater if the required instantaneous power is greater than the instantaneous power of the instantaneous heater, calculate the 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.

[0069] The mixing valve precise adjustment module 203 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.

[0070] In one embodiment, a control system for an energy storage and heat exchange water heater provided in an embodiment of the present application further includes a second mixing valve fast adjustment module.

[0071] In one embodiment, the second water mixing valve quick adjustment module is used to obtain the second water mixing valve adjustment ratio corresponding to the required instantaneous power if the required instantaneous power is not greater than the instantaneous power of the instantaneous heater, and adjust the position of the water mixing valve based on the second water mixing valve adjustment ratio.

[0072] In one embodiment, the power calculation module 201 is used to calculate the required instantaneous power based on the current water inlet temperature, the current water flow rate and the preset temperature, specifically including: calculating the temperature difference between the current water inlet 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: ; 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.

[0073] In one embodiment, the first water mixing valve fast adjustment module 202 is used to calculate the 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, specifically including: calculating the product of a preset target ratio and the required instantaneous power, and using the product as the first adjustment 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; traversing the water mixing valve adjustment parameter association table based on the first adjustment power, determining the first target power in the water mixing valve adjustment parameter association table that matches the first adjustment power, and obtaining the first target water mixing valve adjustment ratio corresponding to the first target power, and using the first target water mixing valve adjustment ratio as the first water mixing valve adjustment ratio corresponding to the first adjustment power.

[0074] In one embodiment, the mixing valve precise adjustment module 203 is used to correct the adjustment ratio of the first mixing valve based on the temperature difference using a PID algorithm, specifically including: obtaining an initial proportional coefficient, an initial integral coefficient and an 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; inputting the temperature difference, the optimized proportional coefficient, the optimized integral coefficient and the optimized differential 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.

[0075] In one embodiment, a control system for an energy storage heat exchange water heater provided in an embodiment of the present application further includes a water demand detection module.

[0076] In one embodiment, the water demand detection module is used to perform fault detection and water tank water level detection on the energy storage heat exchange water heater respectively. When it is detected that there is no fault in the energy storage heat exchange water heater and the water level in the water tank meets a preset water tank water level threshold, the water demand detection is performed 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 is not zero, it is determined that there is currently a water demand.

[0077] In one embodiment, the water demand detection module is used to perform fault detection on the energy storage heat exchange water heater, specifically including: after detecting that the energy storage heat exchange water heater is powered on, performing fault detection on each module circuit in the energy storage heat exchange water heater, and 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 energy storage heat exchange water heater.

[0078] In one embodiment, the water demand detection module is used to detect the water level in the water tank of the energy storage heat exchange water heater, specifically including: obtaining the water level in the water tank of the water tank, and when the water level in the water tank does not meet the preset water level threshold of the water tank, automatically replenishing the water tank until the water level in the water tank meets the preset water level threshold of the water tank; obtaining the water temperature of the water tank, and when the water temperature does not meet the preset water temperature threshold, heating the water in the water tank until the water temperature meets the preset water temperature threshold, and stopping heating the water in the water tank; continuously obtaining the current water temperature of the water tank, and when it is detected that the current water temperature of the water tank drops from the preset water temperature threshold to the preset hysteresis temperature, reheating the water in the water tank.

[0079] The control system of the energy storage heat exchange water heater can implement the control method of the energy storage heat exchange water heater of the method embodiment. The options in the method embodiment are also applicable to this embodiment and will not be described in detail here.

[0080] Example 3, see Figure 3 , Figure 3 is a structural schematic diagram of an embodiment of an energy storage heat exchange water heater provided by the present application, such as Figure 3 As shown, the energy storage heat exchange water heater comprises a water valve 31, a water storage tank 32, a water mixing valve 33, an instant heater 34 and a control system 35 of the energy storage heat exchange water heater described in the above embodiment 2, which is specifically as follows: In one embodiment, the water valve 31 , the water storage tank 32 , the water mixing valve 33 and the instant heater 34 are respectively connected to the control system 35 .

[0081] like Figure 4 As shown, Figure 4 This is another structural schematic diagram of an embodiment of an energy storage and heat exchange water heater provided in the present application.

[0082] In one embodiment, the water outlet end of the water valve 31 is respectively connected to the water inlet end of the water tank 32 and the first water inlet end of the mixing valve 33, the water outlet end of the water 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.

[0083] Specifically, the first water inlet end of the mixing valve 33 is a cold water inlet end, and the second water inlet end of the mixing valve 33 is a hot water inlet end.

[0084] In one embodiment, the energy storage heat exchange water heater further includes a water inlet 36 and a water outlet 37 .

[0085] 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 .

[0086] In one embodiment, the energy storage heat exchange water heater further includes a temperature probe, wherein the temperature probe includes but is not limited to an inlet water temperature probe 381 , a storage water temperature probe 382 , a mixed water temperature probe 383 and an outlet water temperature probe 384 .

[0087] Specifically, the water inlet temperature probe 381 is disposed at the water outlet end of the water inlet 36 , and the water inlet temperature probe 381 is used to detect the temperature of water entering the water valve 31 .

[0088] 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 .

[0089] Specifically, the mixed water temperature probe 383 is disposed at the water outlet end of the mixed water valve 33 , and the mixed water temperature probe 383 is used to detect the outlet water temperature of the mixed water valve 33 .

[0090] Specifically, the outlet water temperature probe 384 is disposed at the outlet water end of the instantaneous heater 34 , and the outlet water temperature probe 384 is used to detect the outlet water temperature of the instantaneous heater 34 .

[0091] like Figure 5 As shown, Figure 5 It is a 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, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114, and the memory 113 is used to store computer programs.

[0092] In one embodiment of the present application, the processor 111 is used to implement the control method of the energy storage heat exchange water heater provided by any one of the aforementioned method embodiments when executing the program stored in the memory 113.

[0093] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0094] Therefore, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the control method for the energy storage heat exchange water heater provided in any of the aforementioned method embodiments are implemented.

[0095] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which can store program codes. The computer-readable storage medium can be non-volatile or volatile.

[0096] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0097] In the several embodiments provided in the present 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 only schematic. For example, the division of each unit is only a logical function division, and there may 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.

[0098] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs. The units in the system of the embodiment of the present application can be combined, divided and deleted according to actual needs. In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0099] 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 the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.

[0100] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0102] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on 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; 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; The temperature difference between the current water outlet temperature and the preset temperature is calculated, and based on the temperature difference, the PID algorithm is used to correct the adjustment ratio of the first water mixing valve, and based on the corrected adjustment ratio of the water mixing valve, the position of the water mixing valve is adjusted until the current water outlet temperature meets the preset temperature.

2. The method according to claim 1, characterized in that Also includes: If the required instantaneous power is not greater than the instantaneous power of the instantaneous heater, a second water mixing valve adjustment ratio corresponding to the required instantaneous power is obtained, and the position of the water mixing valve is adjusted based on the second water mixing valve adjustment ratio.

3. 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.

4. The method according to claim 1, characterized in that: Calculating a first regulating power based on the required instantaneous power, and adjusting the position of the mixing valve based on a first water mixing valve regulating ratio corresponding to the first regulating power, specifically includes: 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.

5. 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.

6. 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.

7. The method according to claim 6, 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.

8. The method according to claim 6, 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.

9. A control system for a water heater for energy storage and heat exchange, characterized in that: It includes a power calculation module, a first water mixing valve fast adjustment module and a water 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.

10. 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 9; 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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