Multi-system water heater operation control method and system

Abstract

The invention relates to the technical field of multi-system water heater automatic control, and discloses a multi-system water heater operation control method and system.The method comprises the steps that operation parameters of all subsystems of a water heater are obtained; determining a target energy demand based on the water inlet temperature of each subsystem and a preset target temperature, and determining the capacity of the current water heater based on the operation frequency of each subsystem; when the target energy demand is far greater than the capacity of the current water heater, the operation frequency of each subsystem is correspondingly adjusted based on the operation mode of the water heater, so that the whole water heater meets the target energy demand; and when the target energy demand is far smaller than the capacity of the current water heater, the operation frequency of each subsystem is adjusted to meet the target energy demand based on at least one factor of the water outlet temperature, the exhaust temperature and the compressor phase current. By automatically controlling the operation of the multi-system water heater, the energy utilization efficiency is improved, the operation cost is reduced, different working conditions and load changes can be better adapted, and the comfort level of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of multi-system water heaters, and in particular to an operation control method and system of a multi-system water heater. Background Art

[0002] With the development of science and technology, multi-system water heaters have been widely used in many fields. These complex systems are designed to meet diverse working needs, but they face many challenges in regulating energy demand. In the current market, multi-part and multi-system machines have obvious deficiencies in the energy demand regulation mechanism.

[0003] In order to achieve the regulation of energy demand, existing technologies often rely on a total inlet and outlet water temperature and water flow parameters to control the energy demand of the whole machine and the equipment terminal. This regulation method is relatively extensive because it does not take into account the unique operating status and energy demand differences of each subsystem of the dual system. The energy demand of each subsystem changes dynamically under different workloads, and relying solely on unified water temperature and water flow regulation cannot accurately match these changes.

[0004] In addition, this adjustment method has a hysteresis problem. Since the system is adjusted based on overall parameter feedback, there is a time difference between detecting changes in energy demand and completing the adjustment action. During this time, the system may have deviated from the optimal operating state, resulting in energy waste or reduced equipment performance. This hysteresis makes it impossible for the system to match energy supply with actual demand in real time, and thus cannot achieve the optimal capacity and energy efficiency of the entire machine.

[0005] This inefficient energy regulation method not only increases operating costs, but also limits the performance of multi-system machines in some application scenarios with high energy efficiency requirements, such as in high-precision production environments or large-scale operations that are sensitive to energy costs. Summary of the invention

[0006] In view of this, the present invention provides a multi-system water heater operation control method and system to solve the problem in the prior art that the multi-system water heater cannot be accurately and automatically controlled, and it is difficult to match the energy supply with actual demand in real time to optimize the capacity and energy efficiency of the entire machine.

[0007] In a first aspect, the present invention provides a multi-system water heater operation control method, the method comprising:

[0008] Obtain the operating parameters of each subsystem of the water heater, including exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency;

[0009] Determine the target energy demand based on the water inlet temperature of each subsystem and the preset target temperature;

[0010] Determine the capacity of the current water heater based on the operating frequency of each subsystem;

[0011] When the target energy demand is much greater than the capacity of the current water heater, the operating frequency of each subsystem is adjusted accordingly based on the operating mode of the water heater so that the entire water heater meets the target energy demand;

[0012] When the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on at least one factor among the outlet water temperature, the exhaust temperature and the compressor phase current so that the water heater as a whole meets the target energy demand.

[0013] The multi-system water heater operation control method provided by the embodiment of the present invention can accurately adjust the operating frequency of each subsystem by obtaining operating parameters and comparing the target energy demand and the current capacity of the water heater, ensuring that the water heater can accurately adjust the unique operating state and energy demand difference of each subsystem according to actual needs, so that the system reaches the best operating state, matches the energy supply with the actual demand in real time, and makes the capacity and energy efficiency of the whole machine reach the optimal value. This precise control method can enable the water heater to better adapt to different working conditions and load changes, improve the user's comfort, and minimize energy waste. Especially in the long-term use process, it can significantly reduce the user's energy costs such as electricity or gas costs, and can effectively extend the service life of each subsystem of the water heater, reduce maintenance costs and the frequency of replacing parts, and improve the reliability and stability of the water heater.

[0014] In an optional implementation, the target energy requirement Q is calculated by the following formula:

[0015] Q = T*Kp + ΔP;

[0016] Among them, T represents the temperature difference reference value between the inlet water temperature of each system and the preset target temperature, ΔP represents the correction value of the temperature difference between the inlet water temperature of each system and the preset target temperature to the capacity demand, and the temperature difference reference value and the correction value are both positively correlated with the temperature difference between the inlet water temperature and the target temperature; Kp represents the temperature difference adjustment gain between the inlet water temperature of each subsystem and the preset target temperature, including heating gain and cooling gain.

[0017] The target energy demand calculation method provided in the embodiment of the present invention is helpful for the coordination between the various subsystems. Each subsystem can adjust its own operating state according to the calculated energy demand, so that the entire water heater system can work together efficiently and ensure that the required energy is provided in the most economical and effective way.

[0018] In an optional implementation, when the target energy demand is much greater than the capacity of the current water heater, the operating frequency of each subsystem is correspondingly adjusted based on the operating mode of the water heater so that the water heater as a whole meets the target energy demand, including:

[0019] When the operation mode of the water heater is the energy efficiency priority mode, the current energy generation capacity and environmental monitoring data of the water heater are input into the pre-built load forecasting model to obtain the energy generation demand change in the preset future time period, and adjust the operation frequency of each subsystem according to the predicted energy generation demand change to minimize the energy consumption of the overall operation of the water heater;

[0020] When the operation mode is the capacity priority mode, the operation frequency of each subsystem is controlled to operate at maximum load to achieve the target energy demand.

[0021] In the energy efficiency priority mode, the embodiment of the present invention inputs the current energy generation capacity and environmental monitoring data into the load forecasting model. The water heater can predict the changes in future energy generation demand in advance, so that the water heater can accurately adjust the operating frequency of each subsystem while meeting the hot water supply demand, avoiding energy waste caused by excessive energy generation; in the capacity priority mode, each subsystem is controlled to operate at maximum load, which can quickly improve the energy generation capacity of the water heater and enable the water heater to quickly meet the target energy demand. When the water inlet temperature suddenly drops or the user has a sudden higher requirement for the hot water temperature, the capacity priority mode can ensure that the water heater has sufficient capacity to cope with it.

[0022] In an optional implementation, when the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the outlet water temperature, including:

[0023] Determine the maximum water outlet temperature corresponding to the water heater according to the ambient temperature;

[0024] When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the first preset temperature threshold range, the frequency limiting state is entered to control the operating frequency of each subsystem not to exceed the operating frequency corresponding to the highest outlet water temperature;

[0025] When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the second preset temperature threshold range, the frequency reduction state is entered, the operating frequency of each subsystem is controlled to be reduced, and the outlet water temperature is detected according to a preset time period until the difference between the actual outlet water temperature and the highest outlet water temperature is within the first preset temperature threshold range;

[0026] When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is at the third preset temperature threshold and lasts for a preset time, the system enters a shutdown protection state and controls the operation of each subsystem to stop.

[0027] The embodiment of the present invention determines the maximum water outlet temperature according to the ambient temperature, so that the water heater can accurately control the water outlet temperature. When the actual water outlet temperature is close to the maximum water outlet temperature, frequency limiting or frequency reduction measures are taken to effectively avoid overheating. In the shutdown protection state, when the difference between the actual water outlet temperature and the maximum water outlet temperature reaches a certain temperature threshold and lasts for a preset time, the water heater stops the operation of each subsystem. This protection mechanism can prevent the water heater from being damaged due to long-term high-temperature operation; when the difference between the actual water outlet temperature and the maximum water outlet temperature is in different ranges, different frequency control strategies are adopted. This hierarchical control method enables the water heater to adjust the operating state more finely and avoid unnecessary high-frequency operation. The operating frequency control strategy based on the water outlet temperature also helps to provide a stable hot water supply experience.

[0028] In an optional implementation, when the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the compressor phase current, including:

[0029] Setting the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the compressor phase current;

[0030] Establishing a mapping relationship between the value interval of the compression phase current and the sum of the operating powers of each subsystem;

[0031] During the effective control time, the adjustment range of the operating power of each subsystem within the control period is determined based on the mapping relationship and the numerical range of the current compression phase current.

[0032] The embodiment of the present invention establishes a mapping relationship between the numerical range of the compressor phase current and the sum of the operating power of each subsystem, and can accurately determine the adjustment range of the operating power of each subsystem under different phase current conditions, so that the water heater can accurately control the power of each subsystem according to the actual working state of the compressor, and set the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the compressor phase current, so as to prevent the compressor from being damaged due to long-term overcurrent or overload.

[0033] In an optional implementation, when the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the exhaust gas temperature, including:

[0034] Set the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the exhaust temperature;

[0035] Establish a mapping relationship between the numerical range of the exhaust temperature and the sum of the operating power of each subsystem;

[0036] During the effective control time, the adjustment range of the operating power of each subsystem within the control period is determined based on the mapping relationship and the numerical range of the current exhaust temperature.

[0037] The embodiment of the present invention helps to improve the coordination of the entire water heater system by establishing a mapping relationship between the exhaust temperature and the sum of the operating power of each subsystem. The operating power of each subsystem is coordinated and adjusted according to the exhaust temperature, so that the energy distribution within the system is more reasonable. When the target energy demand is less than the current energy-generating capacity, the operating power of each subsystem is adjusted according to the exhaust temperature to achieve optimal utilization of energy. It can accurately determine the power range that each subsystem should adjust at different exhaust temperatures, so that the water heater can dynamically adjust the operating state according to the actual exhaust temperature, avoiding excessive consumption of energy and improving the refinement of energy utilization.

[0038] In a second aspect, the present invention provides a multi-system water heater operation control system, comprising:

[0039] The operating parameter monitoring module is used to obtain the operating parameters of each subsystem of the water heater, including exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency;

[0040] A target capacity demand acquisition module is used to determine the target energy demand based on the water inlet temperature of each subsystem and the preset target temperature;

[0041] The current energy generating capacity acquisition module is used to determine the current capacity of the water heater based on the operating frequency of each subsystem;

[0042] A first operation control module is used to adjust the operation frequency of each subsystem based on the operation mode of the water heater when the target energy demand is much greater than the capacity of the current water heater, so that the water heater can meet the target energy demand;

[0043] The second operation control module is used to adjust the operating frequency of each subsystem based on at least one factor among the outlet water temperature, the exhaust temperature, and the compressor phase current when the target energy demand is much smaller than the current capacity of the water heater, so that the water heater as a whole meets the target energy demand.

[0044] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the multi-system water heater operation control method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0045] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the multi-system water heater operation control method of the first aspect or any corresponding embodiment thereof.

[0046] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the multi-system water heater operation control method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 is a flow chart of a multi-system water heater operation control method according to an embodiment of the present invention;

[0049] Figure 2 is a schematic diagram of a relationship curve between an ambient temperature and a maximum outlet water temperature according to an embodiment of the present invention;

[0050] Figure 3 is a structural block diagram of a multi-system water heater operation control system according to an embodiment of the present invention;

[0051] Figure 4 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0053] In order to ensure that the water heater can accurately adjust the unique operating state and energy demand differences of each subsystem according to actual needs, so that the system reaches the optimal operating state. An embodiment of the present invention provides an embodiment of a multi-system water heater operation control method. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0054] In this embodiment, a multi-system water heater operation control method is provided. Figure 1is a flow chart of a multi-system water heater operation control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0055] S101, obtaining operating parameters of each subsystem of the water heater, including exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency.

[0056] Specifically, the inlet water temperature is an important reference factor for the performance of the water heater. By obtaining the inlet water temperature, the performance strategy can be reasonably arranged according to different water temperatures; the monitoring of the outlet water temperature is directly related to the user's experience. By obtaining the outlet water temperature in real time, the water heater can ensure that the hot water temperature provided meets the user's settings; the exhaust temperature is crucial to the safety and performance of the water heater. Excessive exhaust temperature may mean that there is a system failure, such as compressor overload, poor heat dissipation, etc. By monitoring the exhaust temperature, these potential problems can be discovered in time and measures can be taken in time; the monitoring of the compressor phase current helps to determine the working status of the compressor. Timely acquisition of phase current information can achieve early warning of faults and prevent compressor damage; the operating frequency reflects the working rhythm of each subsystem of the water heater. Different operating frequencies will affect the performance efficiency and energy consumption. By monitoring the operating frequency, it can be understood whether the water heater is operating efficiently or inefficiently, and then optimized and adjusted.

[0057] The embodiment of the present invention obtains multiple operating parameters (exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency) of each subsystem of the water heater for subsequent comprehensive analysis, making the control of the water heater more refined. Compared with the traditional simple control method, this multi-parameter control can better adapt to different use environments and user needs.

[0058] S102: Determine a target energy requirement based on the water inlet temperature of each subsystem and a preset target temperature.

[0059] Specifically, the target energy requirement Q in the embodiment of the present invention is calculated by the following formula:

[0060] Q = T*Kp + ΔP;

[0061] Among them, T represents the temperature difference reference value between the inlet water temperature of each system and the preset target temperature, ΔP represents the correction value of the temperature difference between the inlet water temperature of each system and the preset target temperature for the capacity demand, and the temperature difference reference value and correction value are both positively correlated with the temperature difference between the inlet water temperature and the target temperature; Kp represents the temperature difference adjustment gain between the inlet water temperature of each subsystem and the preset target temperature, including heating gain and cooling gain.

[0062] In one embodiment, the setting range of the heating gain and the cooling gain is [0-10]. In the heating mode, when the inlet water temperature is lower than the preset target temperature, a positive temperature difference will be generated. The larger the temperature difference reference value, the greater the amplitude of the water temperature increase. The heating gain is mainly used to adjust the heating capacity demand according to the temperature difference reference value. A larger heating gain will enable the hot water pump to increase the water temperature faster in the heating mode to reach the target temperature. For example, for a large hot water supply system, a large amount of hot water needs to be provided quickly, and a higher heating gain can be set; in the cooling mode, when the inlet water temperature is higher than the preset target temperature, a positive temperature difference will be generated. This temperature difference reference value reflects the amplitude of the water temperature reduction. The cooling gain is used to control the efficiency of the cooling. A higher cooling gain can enable the cooling system to reduce the water temperature faster. For example, in the food refrigeration and preservation scenario, the water temperature needs to be quickly reduced to a suitable refrigeration temperature, and a higher cooling gain can be set.

[0063] Due to the large temperature difference between the inlet water temperature and the target temperature, the heating process or cooling may be affected by environmental factors. The correction value (ΔP) takes these additional factors into account to ensure that there is sufficient heating or cooling capacity to achieve the target temperature.

[0064] The embodiment of the present invention facilitates the coordination between the various subsystems through the above target energy demand calculation method. Each subsystem can adjust its own operating state according to the calculated energy demand, so that the entire water heater system can work together efficiently and ensure that the required energy is provided in the most economical and effective way. By accurately calculating the energy demand, the water heater can achieve precise control of energy input. When the energy demand is clear, the water heater can reasonably adjust the operating frequency and other parameters of each subsystem according to this demand to ensure that the required energy is provided in the most economical and effective way.

[0065] In one embodiment, the temperature difference between the inlet water temperature and the target temperature is divided into a plurality of range intervals, each range interval corresponds to a temperature difference reference value and a correction value, the larger the temperature difference value is, the larger the corresponding temperature difference reference value and correction value are. In a specific embodiment, the corresponding relationship is shown in Table 1:

[0066] Table 1

[0067]

[0068] The embodiment of the present invention divides the temperature difference between the inlet water temperature and the target temperature into multiple range intervals, and sets a corresponding temperature difference reference value and correction value for each interval, so that the calculation of the energy demand of the water heater is more accurate. Different temperature difference ranges represent different energy production difficulties and demand levels. For example, when the temperature difference is small, it means that the required energy production is relatively small. At this time, the corresponding temperature difference reference value and correction value are also small, and the water heater can work according to the relatively low energy production demand; when the temperature difference is large, such as when the inlet water temperature is very low in cold weather, the corresponding larger temperature difference reference value and correction value will allow the water heater to accurately increase the energy production demand, ensure that there is enough energy to heat the water, so that the temperature of the hot water supply can reach the target temperature, and adjust the energy production demand according to different temperature difference intervals, which can also effectively avoid energy waste.

[0069] S103, determining the current capacity of the water heater based on the operating frequency of each subsystem.

[0070] Specifically, the capacity of the current water heater is the heating (cooling) capacity, and the total heating (cooling) capacity demand will be reflected in the compressor frequency of each subsystem. For example, a water heater includes subsystem 1 and subsystem 2, then the operating frequency of the variable frequency compressor of subsystem 1 in the single compressor operation mode is A (Hz); the operating frequency of the variable frequency compressor of subsystem 2 in the single compressor operation mode is B (Hz); then A+B (Hz) is the operating frequency of the variable frequency compressors of subsystem 1 and subsystem 2 in the dual compressor operation mode.

[0071] Since water heaters of different models and brands differ in component performance, system design, etc., it is necessary to determine the correspondence between operating frequency and energy-generating capacity based on the specific working principle and physical characteristics of the water heater. Within a certain pressure range, the higher the operating frequency of the compressor, the faster the refrigerant circulation speed, the more heat is absorbed or released per unit time, and thus the stronger the energy-generating capacity.

[0072] S104, when the target energy demand is much greater than the capacity of the current water heater, the operating frequency of each subsystem is adjusted accordingly based on the operating mode of the water heater, so that the water heater as a whole meets the target energy demand.

[0073] In one example, when the target energy demand value exceeds twice the capacity of the current water heater (for example, the target energy demand is 10kW·h, and the current water heater capacity is 4kW·h), it is considered that the target energy demand is much greater than the current water heater capacity. At this time, the embodiment of the present invention adjusts the subsystem frequency according to the operation mode, which can make the coordination between the various subsystems of the water heater more efficient. Meeting the target energy demand through precise frequency adjustment can avoid energy waste. If no adjustment is made, the water heater may always operate at a lower efficiency, fail to meet demand, and consume a lot of energy.

[0074] In one embodiment, when the operation mode of the water heater is the energy efficiency priority mode, the current energy generation capacity and environmental monitoring data (such as ambient temperature and humidity) of the water heater are input into the pre-built load prediction model to obtain the energy generation demand change in the preset future time period, and adjust the operation frequency of each subsystem according to the predicted energy generation demand change, so that the overall energy consumption of the water heater is minimized. The pre-built load prediction model is established by collecting historical operation data, including the energy demand of each system in different time periods, different seasons, and different weather conditions, as well as the corresponding parameters such as ambient temperature and humidity, and using big data analysis technology. The load prediction model is a model obtained by training a preset neural network based on the above historical operation data to predict the load in the preset future time period.

[0075] The embodiment of the present invention predicts the energy demand change trend of each system in the future through the load forecasting model, adjusts the operating state of the air source heat pump in advance to make it closer to the actual demand, and dynamically predicts the energy demand change in the short term in combination with the current operating state and environmental factors. For example, in the hotel's heating and hot water system, the total energy demand is very large, and the demand deviation between heating and hot water is very large. For example, the demand for heating is very small, and the demand for hot water is very large. By monitoring the room occupancy rate, water temperature changes, outdoor temperature, etc., the peak and trough of hot water and air conditioning use are predicted in advance, and the operating parameters of the heat pump are adjusted in advance, such as increasing the operating frequency A (Hz) of the heating system and reducing the operating frequency B (Hz) of the hot water system, so as to ensure that the energy efficiency reaches an optimal operating value. In the case of limited energy, it will give priority to meeting the energy demand of key systems.

[0076] In one embodiment, when the operation mode is the capacity priority mode, the operation frequency of each subsystem is controlled to run at maximum load to achieve the target energy demand. Specifically, by controlling and adjusting the operating frequency of the compressor, the compressor frequency A+B (Hz) is increased, so that the compressor can operate efficiently at full load or close to full load; at the same time, the opening of the electronic expansion valve is increased to allow more refrigerant to flow into the evaporator, increase the heat exchange capacity of the evaporator, thereby enhancing the cooling or heating capacity of the heat pump, control and increase the fan speed, increase the air flow, strengthen the heat exchange efficiency between the evaporator and the air, and improve the heating or cooling capacity of the heat pump; increase the speed of the water pump, increase the circulation flow and pressure of the water, and ensure that the heat pump can effectively transfer heat to the user end.

[0077] S105, when the target energy demand is much smaller than the current capacity of the water heater, the operating frequency of each subsystem is adjusted based on at least one factor among the outlet water temperature, the exhaust temperature, and the compressor phase current, so that the water heater as a whole meets the target energy demand.

[0078] In one example, when the capacity value of the current water heater exceeds twice the target energy demand value (for example, the capacity of the current water heater is 10kW·h and the target energy demand is 4kW·h), it is considered that the target energy demand is much smaller than the capacity of the current water heater. At this time, in an embodiment of the present invention, the process of adjusting the operating frequency of each subsystem based on at least one factor among the outlet water temperature, the exhaust temperature, and the compressor phase current is a parallel implementation process. Adjusting the operating frequency based on the outlet water temperature, the exhaust temperature, and the compressor phase current in parallel can allow the water heater system to respond to changing operating conditions more quickly.

[0079] Specifically, when the target energy demand is much smaller than the capacity of the current water heater, the process of adjusting the operating frequency of each subsystem based on the outlet water temperature includes:

[0080] A1, determine the maximum water outlet temperature of the water heater according to the ambient temperature;

[0081] A2: When the difference between the actual outlet water temperature and the maximum outlet water temperature corresponding to the current ambient temperature is within the first preset temperature threshold range, the system enters the frequency limiting state, and controls the operating frequency of each subsystem not to exceed the operating frequency corresponding to the maximum outlet water temperature; for example, the actual outlet water temperature is 58°C, and the maximum outlet water temperature corresponding to the current ambient temperature is 60°C. The difference between the two is -1°C, which is within the first preset temperature threshold range (-2°C-0°C), and the system enters the frequency limiting state.

[0082] A3, when the difference between the actual outlet water temperature and the maximum outlet water temperature corresponding to the current ambient temperature is within the second preset temperature threshold range, the system enters the frequency reduction state, controls the reduction of the operating frequency of each subsystem, and detects the outlet water temperature according to the preset time period until the difference between the actual outlet water temperature and the maximum outlet water temperature is within the first preset temperature threshold range; for example, when the actual outlet water temperature is 52°C and the maximum outlet water temperature corresponding to the current ambient temperature is 50°C, the difference between the two is 2°C, which is within the second preset temperature threshold range (1°C-5°C), the system enters the frequency limiting state.

[0083] A4: When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the third preset temperature threshold range and lasts for a preset time, the system enters the shutdown protection state and controls the operation of each subsystem to stop. For example, if the actual outlet water temperature is 60°C, the highest outlet water temperature corresponding to the current ambient temperature is 50°C, and the difference between the two is 10°C, and the temperature is within the third preset temperature threshold range (6°C-10°C) for more than 10 seconds, the system enters the shutdown protection state.

[0084] Specifically, when the embodiment of the present invention detects that the total energy demand of the user is very small, it actively detects the restriction of the heating outlet water temperature on the energy demand. When the outlet water temperature is too high, when the operating frequency A+B (Hz) in the heating operation process conflicts with the frequency reduction due to the high outlet water temperature, the frequency reduction due to the high outlet water temperature will be prioritized (at this time, the energy demand can only be reduced, not increased). Figure 2 Shown is a graph showing the relationship between ambient temperature and the corresponding maximum water outlet temperature.

[0085] 1) When the outlet water temperature ≥ Figure 2 When the middle curve corresponds to a temperature of -1°C, the frequency is limited and the energy demand is not allowed to rise. If the set target temperature is higher than the maximum outlet water temperature corresponding to the current ambient temperature, the maximum outlet water temperature corresponding to the current ambient temperature is used as the target temperature.

[0086] (2) When the outlet water temperature ≥ Figure 2 When the middle curve corresponds to a temperature of +0.5℃, the outlet water temperature enters the over-high frequency reduction stage, and it is necessary to immediately reduce the frequency by 2 levels. After an interval of 10S, the outlet water temperature is tested again. If the outlet water temperature is still ≥ the temperature corresponding to the curve +0.5℃, it is necessary to reduce the frequency by 2 levels again, and test in a cycle until the outlet water temperature is < Figure 2 The middle curve corresponds to a temperature of -1°C, and the energy can only be reduced but not increased.

[0087] (3) When the outlet water temperature is greater than A07 for 10 seconds (to prevent abnormal water temperature fluctuations), the unit enters the shutdown protection state; when in the outlet water temperature over-high protection state, the outlet water temperature must be less than (A07-10)℃ to release the outlet water temperature over-high protection shutdown state. The unit is allowed to start again after the shutdown protection lasts for 3 minutes.

[0088] The embodiment of the present invention determines the maximum water outlet temperature according to the ambient temperature, so that the water heater can accurately control the water outlet temperature. When the actual water outlet temperature is close to the maximum water outlet temperature, frequency limiting or frequency reduction measures are taken to effectively avoid overheating. In the shutdown protection state, when the difference between the actual water outlet temperature and the maximum water outlet temperature reaches a certain temperature threshold and lasts for a preset time, the water heater stops the operation of each subsystem. This protection mechanism can prevent the water heater from being damaged due to long-term high-temperature operation; when the difference between the actual water outlet temperature and the maximum water outlet temperature is in different ranges, different frequency control strategies are adopted. This hierarchical control method enables the water heater to adjust the operating state more finely and avoid unnecessary high-frequency operation. The operating frequency control strategy based on the water outlet temperature also helps to provide a stable hot water supply experience.

[0089] In the embodiment of the present invention, when the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the compressor phase current, including:

[0090] B1, setting the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the compressor phase current;

[0091] B2, establishing a mapping relationship between the value interval of the compression phase current and the sum of the operating powers of each subsystem;

[0092] B3, within the effective control time, determining the adjustment range of the operating power of each subsystem within the control period based on the mapping relationship and the numerical range of the current compression phase current.

[0093] In a specific embodiment, the control of the compressor current over the frequency must be effective after the machine is started and running for 5 minutes. The control period of the compressor current is 30 seconds. The mapping relationship between the numerical range of the compression phase current and the sum of the operating powers of each subsystem is shown in Table 2. When the compressor current drops to the A1 zone, the compressor frequency A+B (Hz) drops by x1HZ every 30 seconds. When the current drops to the B1 zone, the compressor frequency A+B (Hz) drops by y1HZ every 30 seconds. When the current drops to the C1 zone, the compressor frequency A+B (Hz) drops by z1HZ every 30 seconds.

[0094] Table 2

[0095] Area A1 x 1 Area B1 Y Zone C1 ZlUT

[0096] The embodiment of the present invention establishes a mapping relationship between the numerical range of the compressor phase current and the sum of the operating power of each subsystem, and can accurately determine the adjustment range of the operating power of each subsystem under different phase current conditions, so that the water heater can accurately control the power of each subsystem according to the actual working state of the compressor, and set the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the compressor phase current, so as to prevent the compressor from being damaged due to long-term overcurrent or overload.

[0097] In an embodiment of the present invention, when the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the exhaust temperature, including:

[0098] C1, set the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the exhaust temperature;

[0099] C2, establish a mapping relationship between the numerical range of the exhaust temperature and the sum of the operating power of each subsystem;

[0100] C3, within the effective control time, determining the adjustment range of the operating power of each subsystem within the control period based on the mapping relationship and the numerical range of the current exhaust temperature.

[0101] In a specific embodiment, when the exhaust temperature controls the frequency, the compressor must be started and run for 5 minutes. The control period of the exhaust temperature of the compressor is 30 seconds. The mapping relationship between the numerical range of the exhaust temperature and the sum of the operating powers of each subsystem is shown in Table 3. When the exhaust temperature of the equipment drops to the E1 zone, the compressor frequency A+B (Hz) drops by x1HZ every 30 seconds. When the exhaust temperature drops to the F1 zone, the compressor frequency A+B (Hz) drops by y1HZ every 30 seconds. When the exhaust temperature drops to the H1 zone, the compressor frequency A+B (Hz) drops by z1HZ every 30 seconds.

[0102] Table 3

[0103] E1 Zone xH F1 Zone Yj Y H1 Zone ZGar

[0104] The embodiment of the present invention helps to improve the coordination of the entire water heater system by establishing a mapping relationship between the exhaust temperature and the sum of the operating power of each subsystem. The operating power of each subsystem is coordinated and adjusted according to the exhaust temperature, so that the energy distribution within the system is more reasonable. When the target energy demand is less than the current energy-generating capacity, the operating power of each subsystem is adjusted according to the exhaust temperature to achieve optimal utilization of energy. It can accurately determine the power range that each subsystem should adjust at different exhaust temperatures, so that the water heater can dynamically adjust the operating state according to the actual exhaust temperature, avoiding excessive energy consumption and improving the refinement of energy utilization. Reasonable control time and cycle settings can make the operating frequency adjustment process of each subsystem smoother, avoiding frequent and large adjustments to the operating frequency that may cause drastic fluctuations in the internal pressure of the system.

[0105] In this embodiment, a multi-system water heater operation control system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0106] This embodiment provides a multi-system water heater operation control system, such as Figure 3 As shown, including:

[0107] The operating parameter monitoring module 301 is used to obtain the operating parameters of each subsystem of the water heater, including: exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency;

[0108] A target capacity requirement acquisition module 302 is used to determine the target energy requirement based on the water inlet temperature of each subsystem and a preset target temperature;

[0109] The current energy generating capacity acquisition module 303 is used to determine the current capacity of the water heater based on the operating frequency of each subsystem;

[0110] The first operation control module 304 is used to adjust the operation frequency of each subsystem based on the operation mode of the water heater when the target energy demand is much greater than the capacity of the current water heater, so that the water heater can meet the target energy demand;

[0111] The second operation control module 305 is used to adjust the operating frequency of each subsystem based on at least one factor among the outlet water temperature, the exhaust temperature, and the compressor phase current when the target energy demand is much smaller than the current capacity of the water heater, so that the water heater as a whole meets the target energy demand.

[0112] In some optional implementations, the target energy requirement Q in the target capacity requirement acquisition module 302 is calculated by the following formula:

[0113] Q = T*Kp + ΔP;

[0114] Among them, T represents the temperature difference reference value between the inlet water temperature of each system and the preset target temperature, ΔP represents the correction value of the temperature difference between the inlet water temperature of each system and the preset target temperature to the capacity demand, and the temperature difference reference value and the correction value are both positively correlated with the temperature difference between the inlet water temperature and the target temperature; Kp represents the temperature difference adjustment gain between the inlet water temperature of each subsystem and the preset target temperature, including heating gain and cooling gain.

[0115] In some optional implementations, the first operation control module 304 includes:

[0116] The energy efficiency priority mode control unit is used to input the current energy generation capacity and environmental monitoring data of the water heater into a pre-built load prediction model when the operation mode of the water heater is the energy efficiency priority mode, obtain the energy generation demand change in a preset future time period, and adjust the operation frequency of each subsystem according to the predicted energy generation demand change, so as to minimize the energy consumption of the overall operation of the water heater;

[0117] The capacity priority mode control unit is used to control the operating frequency of each subsystem to operate at maximum load to achieve the target energy demand when the operating mode is the capacity priority mode.

[0118] In some optional embodiments, the second operation control module 305 includes: an outlet water temperature control frequency unit, which is used to determine the maximum outlet water temperature corresponding to the water heater according to the ambient temperature; when the difference between the actual outlet water temperature and the maximum outlet water temperature corresponding to the current ambient temperature is within the first preset temperature threshold range, the unit enters a frequency limiting state, and controls the operating frequency of each subsystem not to exceed the operating frequency corresponding to the maximum outlet water temperature; when the difference between the actual outlet water temperature and the maximum outlet water temperature corresponding to the current ambient temperature is within the second preset temperature threshold range, the unit enters a frequency reduction state, controls the operating frequency of each subsystem to be reduced, and detects the outlet water temperature according to a preset time period until the difference between the actual outlet water temperature and the maximum outlet water temperature is within the first preset temperature threshold range; when the difference between the actual outlet water temperature and the maximum outlet water temperature corresponding to the current ambient temperature is within the third preset temperature threshold and lasts for a preset period of time, the unit enters a shutdown protection state, and controls the operation of each subsystem to be stopped.

[0119] In some optional embodiments, the second operation control module 305 includes: a compressor phase current control frequency unit, which is used to set the effective control time and control period for adjusting the operating frequency of each subsystem based on the compressor phase current; establish a mapping relationship between the numerical range of the compression phase current and the sum of the operating power of each subsystem; within the effective control time, determine the adjustment range of the operating power of each subsystem within the control period based on the mapping relationship and the current numerical range of the compression phase current.

[0120] In some optional embodiments, the second operation control module 305 includes: an exhaust temperature control frequency unit, which is used to set the effective control time and control period for adjusting the operating frequency of each subsystem based on the exhaust temperature; establish a mapping relationship between the numerical range of the exhaust temperature and the sum of the operating power of each subsystem; within the effective control time, determine the adjustment range of the operating power of each subsystem within the control period based on the mapping relationship and the numerical range of the current exhaust temperature.

[0121] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0122] The multi-system water heater operation control system in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0123] The embodiment of the present invention also provides a computer device having the above Figure 3 The multi-system water heater operation control system shown.

[0124] See also Figure 4 , Figure 4 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 4 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 4 A processor 10 is taken as an example.

[0125] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0126] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0127] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0128] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0129] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0130] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor central control system or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0131] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of computer program instructions in computer-readable media includes, but is not limited to, source files, executable files, installation package files, etc., and accordingly, the way in which computer program instructions are executed by a computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0132] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A multi-system water heater operation control method, characterized in that: include: Obtain the operating parameters of each subsystem of the water heater, including exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency; Determine the target energy demand based on the water inlet temperature of each subsystem and the preset target temperature; Determine the capacity of the current water heater based on the operating frequency of each subsystem; When the target energy demand is much greater than the capacity of the current water heater, the operating frequency of each subsystem is adjusted accordingly based on the operating mode of the water heater so that the entire water heater meets the target energy demand; When the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on at least one factor among the outlet water temperature, the exhaust temperature and the compressor phase current so that the water heater as a whole meets the target energy demand.

2. The method according to claim 1, characterized in that The target energy requirement Q is calculated by the following formula: Q = T*Kp + ΔP; Among them, T represents the temperature difference reference value between the inlet water temperature of each system and the preset target temperature, ΔP represents the correction value of the temperature difference between the inlet water temperature of each system and the preset target temperature to the capacity demand, and the temperature difference reference value and the correction value are both positively correlated with the temperature difference between the inlet water temperature and the target temperature; Kp represents the temperature difference adjustment gain between the inlet water temperature of each subsystem and the preset target temperature, including heating gain and cooling gain.

3. The method according to claim 1, characterized in that When the target energy demand is much greater than the capacity of the current water heater, the operating frequency of each subsystem is correspondingly adjusted based on the operating mode of the water heater so that the water heater as a whole meets the target energy demand, including: When the operation mode of the water heater is the energy efficiency priority mode, the current energy generation capacity and environmental monitoring data of the water heater are input into the pre-built load forecasting model to obtain the energy generation demand change in the preset future time period, and adjust the operation frequency of each subsystem according to the predicted energy generation demand change to minimize the energy consumption of the overall operation of the water heater; When the operation mode is the capacity priority mode, the operation frequency of each subsystem is controlled to operate at maximum load to achieve the target energy demand.

4. The method according to claim 1, characterized in that When the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the outlet water temperature, including: Determine the maximum water outlet temperature corresponding to the water heater according to the ambient temperature; When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the first preset temperature threshold range, the frequency limiting state is entered to control the operating frequency of each subsystem not to exceed the operating frequency corresponding to the highest outlet water temperature; When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the second preset temperature threshold range, the frequency reduction state is entered, the operating frequency of each subsystem is controlled to be reduced, and the outlet water temperature is detected according to a preset time period until the difference between the actual outlet water temperature and the highest outlet water temperature is within the first preset temperature threshold range; When the difference between the actual outlet water temperature and the highest outlet water temperature corresponding to the current ambient temperature is within the third preset temperature threshold range and lasts for a preset period of time, the system enters a shutdown protection state and controls the operation of each subsystem to stop.

5. The method according to claim 1, characterized in that When the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the compressor phase current, including: Setting the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the compressor phase current; Establishing a mapping relationship between the value interval of the compression phase current and the sum of the operating powers of each subsystem; During the effective control time, the adjustment range of the operating power of each subsystem within the control period is determined based on the mapping relationship and the numerical range of the current compression phase current.

6. The method according to claim 1, characterized in that When the target energy demand is much smaller than the capacity of the current water heater, the operating frequency of each subsystem is adjusted based on the exhaust gas temperature, including: Set the effective control time and control cycle for adjusting the operating frequency of each subsystem based on the exhaust temperature; Establish a mapping relationship between the numerical range of the exhaust temperature and the sum of the operating power of each subsystem; During the effective control time, the adjustment range of the operating power of each subsystem within the control period is determined based on the mapping relationship and the numerical range of the current exhaust temperature.

7. A multi-system water heater operation control system, characterized in that: include: The operating parameter monitoring module is used to obtain the operating parameters of each subsystem of the water heater, including exhaust temperature, water inlet temperature, water outlet temperature, compressor phase current and operating frequency; A target capacity demand acquisition module is used to determine the target energy demand based on the water inlet temperature of each subsystem and the preset target temperature; The current energy generating capacity acquisition module is used to determine the current capacity of the water heater based on the operating frequency of each subsystem; A first operation control module is used to adjust the operation frequency of each subsystem based on the operation mode of the water heater when the target energy demand is much greater than the capacity of the current water heater, so that the water heater can meet the target energy demand; The second operation control module is used to adjust the operating frequency of each subsystem based on at least one factor among the outlet water temperature, the exhaust temperature, and the compressor phase current when the target energy demand is much smaller than the current capacity of the water heater, so that the water heater as a whole meets the target energy demand.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the multi-system water heater operation control method according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the multi-system water heater operation control method according to any one of claims 1 to 6.

10. A computer program product, characterized in that It comprises computer instructions, and the computer instructions are used to make a computer execute the multi-system water heater operation control method according to any one of claims 1-6.

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