Control method and hot water system

Abstract

The invention provides a control method and a hot water system, relates to the technical field of hot water systems, and solves the technical problems of high energy consumption, heat loss and excessive heat supply of the hot water system. The control method comprises the following steps that the load of a hot water system is predicted based on the preset daily total hot water consumption and predicted weather parameters of the second day; controlling the hot water system to start based on the predicted hot water system load; obtaining heating water tank internal parameters and solar water heating assembly water production parameters; adjusting the liquid level of the heat-preservation water tank based on the parameters in the heating water tank and the operation time of the hot water system; and switching the water production mode of the hot water system based on the water production parameters of the solar hot water assembly. The actual water supply temperature and the water production capacity of the main machine are adjusted based on future outdoor meteorological parameters and heat consumption changes, the load prediction function is achieved, the system energy consumption is reduced, different liquid levels are divided according to the hot water consumption and the daily time period, and the system energy consumption is reduced while the hot water consumption requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of hot water systems, and in particular to a control method and a hot water system. Background Art

[0002] like Figure 1 As shown in the figure, traditional hot water systems consider the stability of automatic control, and are mostly fixed-frequency main engine + fixed-frequency water pump, and only have one hot water tank. The temperature distribution in the tank is uneven, and it is easy to over-heat, and the system energy consumption is high. In addition, there is only one maximum liquid level in the hot water tank, which cannot be adjusted in real time according to the demand for hot water. A large amount of hot water is stored in the hot water tank, and heat is continuously lost, which increases the energy consumption of the system.

[0003] In view of the above analysis, a hot water system with load prediction linkage and variable liquid level regulation and its control method are recommended to meet the heating demand while reducing the system energy consumption. Summary of the invention

[0004] The object of the present invention is to provide a control method and a hot water system to solve the technical problems of high energy consumption, heat loss and excessive heating of the hot water system in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A control method provided by the present invention is implemented by using a hot water system, wherein the hot water system includes a heating water tank, an insulation water tank, a solar water heater component and a variable frequency heat pump component; before the hot water system is started, a target temperature of each water tank and a total daily hot water consumption are preset; the control method includes the following steps:

[0007] Based on the preset daily total hot water consumption and the next day's predicted weather parameters, the hot water system load is predicted; wherein the hot water system load includes the hourly hot water production and frequency;

[0008] Based on the predicted hot water system load, control the hot water system startup to meet the hourly hot water production demand;

[0009] Obtain the parameters in the heating water tank, the parameters in the insulation water tank and the water production parameters of the solar water heating component;

[0010] Based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank to adjust the liquid level of the insulation water tank;

[0011] Based on the water production parameters of the solar water heating components, switch the water production mode of the hot water system.

[0012] The control method of the present invention adjusts the actual water supply temperature and water production capacity of the main unit based on future outdoor meteorological parameters and heat consumption changes, realizes the function of load prediction, links solar energy with air source variable frequency water heater and variable frequency water pump, gives priority to solar energy for hot water supply, and uses variable frequency water heater to supplement when it is insufficient, further reduces the energy consumption of the system, divides different liquid levels according to the amount of hot water used and the time period of the day, meets the hot water demand while reducing the energy consumption of the system.

[0013] As a further improvement of the present invention, before controlling the start of the hot water system based on the predicted hot water system load to meet the hourly hot water production demand, the method further includes:

[0014] Calculate the hot water system load correction parameters based on the actual weather parameters of the next day;

[0015] Based on the calculated hot water system load correction parameter and the predicted hot water system load, the actual load of the hot water system is obtained.

[0016] As a further improvement of the present invention, based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank, and the liquid level of the insulation water tank is adjusted, including:

[0017] Obtain the running time of the hot water system to determine the water usage period;

[0018] Based on the water usage period, obtain the set liquid level value of the insulation water tank;

[0019] Get the liquid level value in the insulation water tank;

[0020] Compare the liquid level value in the insulation water tank with the set liquid level value of the insulation water tank;

[0021] Compare the water supply temperature T1 in the heating water tank with the target water temperature T6 set in the heating water tank;

[0022] Water replenishment control is carried out based on the comparison results of liquid level and water temperature.

[0023] As a further improvement of the present invention, the step of obtaining the running time of the hot water system to determine the water use period includes:

[0024] When the hot water system runs from 22:00 to 13:00 the next day, it is considered as a low water consumption period;

[0025] When the hot water system runs from 13:00 to 22:00, it is considered a high water usage period.

[0026] As a further improvement of the present invention, the step of obtaining a set liquid level value of the thermal insulation water tank based on the water use period includes:

[0027] When it is judged to be a low water consumption period, the set liquid level value in the thermal insulation water tank is low;

[0028] When it is determined to be a high water usage period, the set liquid level value in the thermal insulation water tank is high.

[0029] As a further improvement of the present invention, the water replenishment control based on the comparison result of the liquid level and the water temperature includes:

[0030] When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the low level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank;

[0031] When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is higher than the low-level liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water;

[0032] When the hot water system is running in a low-water consumption period, when the water supply temperature of the heating water tank T1 is less than the set temperature of the heating water tank T6 + △T6, the hot water system continues to operate to increase the water supply temperature of the heating water tank;

[0033] When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the high level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank;

[0034] When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level value in the insulation water tank is higher than the high-end liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water;

[0035] When the hot water system is running in a high-water consumption period, when the water supply temperature T1 of the heating water tank is less than the set temperature T6+△T6 of the heating water tank, the hot water system continues to run to increase the water supply temperature of the heating water tank;

[0036] Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

[0037] As a further improvement of the present invention, after the valve F5 is opened to supply the hot water in the heating water tank to the heat preservation water tank, the method further includes:

[0038] Get the real-time supply water temperature in the heating water tank;

[0039] When the real-time supply water temperature in the heating water tank reaches the maximum limit temperature, the water supply solenoid valve is opened to start supplying water to the heating water tank;

[0040] Obtain the temperature of the water after filling in the heating water tank and the filling water level value in the heating water tank;

[0041] When the temperature of the replenished water in the heating water tank drops to the lowest limit temperature, or when the replenished water level in the heating water tank reaches the highest level, the replenished water solenoid valve is controlled to close to stop replenishing water.

[0042] As a further improvement of the present invention, the method of switching the water production mode of the hot water system based on the water production parameters of the solar water heating component includes:

[0043] Obtain water temperature parameters of water produced by solar water heating components;

[0044] When the water temperature parameter is less than the set water supply temperature of the solar water heater T1+△T1, it switches to the hot water production mode with only the variable frequency heat pump component running;

[0045] When the water temperature parameter is ≥ the set water supply temperature of the solar water heater T1+△T1, the mode is switched to the hot water production mode where only the solar water heating component operates; then the water temperature parameter is compared with the set temperature T6 of the heating water tank again;

[0046] When the water temperature parameter is ≥ the set temperature of the heating water tank T6 + △T6, only the solar water heating component will operate in the hot water production mode;

[0047] When the water temperature parameter is less than the set temperature of the heating water tank T6+△T6, the solar water heating component and the variable frequency heat pump component are switched to the hot water production mode at the same time;

[0048] Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

[0049] As a further improvement of the present invention, the value range of the set first temperature difference ΔT6 is: 0°C≤ΔT6≤10°C; and / or the value range of the set second temperature difference ΔT1 is: 0°C≤ΔT1≤10°C.

[0050] The control method of the present invention is connected with the weather forecast and the customer's hot water usage pattern to predict the hot water usage for the next day, calculate the hot water system load, start the system in advance with the predicted frequency, and adjust the frequency of the variable frequency hot water host to meet the heating demand based on this. It is more energy-efficient, more advanced, more specific, and more practical, with different prediction methods and different time lengths.

[0051] The present invention provides a hot water system for executing the control method, wherein the hot water system comprises a heating water tank, an insulation water tank, a solar water heating component, a variable frequency heat pump component and a detection control element; wherein:

[0052] The solar water heating component is connected to the heating water tank;

[0053] The thermal insulation water tank is respectively connected to the heating water tank and the user side;

[0054] The variable frequency heat pump assembly is connected to both the heating water tank and the insulation water tank;

[0055] The detection control element is arranged on the heating water tank, the heat preservation water tank, the solar water heating component and the variable frequency heat pump component.

[0056] As a further improvement of the present invention, the variable frequency heat pump assembly includes electric auxiliary heating, a variable frequency heat pump unit, and a variable frequency water pump which are arranged in sequence.

[0057] The hot water system of the present invention is applied to various places where hot water supply is required. The actual water supply temperature and water production capacity of the main unit are adjusted based on future outdoor meteorological parameters to realize the function of load prediction. At the same time, solar energy and air source variable frequency water heaters are linked, solar energy is used for hot water supply first, and different liquid levels are divided according to the amount of hot water used and the time period of each day, so as to meet the demand for hot water while reducing the system energy consumption by more than 20%, solving the problem that the traditional hot water system design only configures fixed frequency units according to the maximum hot water demand, the units are frequently added and reduced during partial load, the system energy consumption is high, and there is no load prediction function, solving the problem that the traditional hot water system uses a fixed frequency water pump and has high energy consumption during partial load, and solving the problem that the traditional hot water system uses a fixed liquid level, cannot change the liquid level according to the heat demand, has poor adjustment ability and high energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 It is a system composition diagram of a hot water system in the prior art;

[0060] Figure 2 is a system composition diagram of the hot water system of the present invention;

[0061] Figure 3 It is a control flow chart of the hot water system control method of the present invention.

[0062] In the figure, 1. Heating water tank; 2. Insulated water tank; 3. Solar water heating component; 4. User side; 5. Electric auxiliary heating; 6. Variable frequency heat pump unit; 7. Variable frequency water pump. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0064] like Figure 3 As shown, the present invention provides a control method for a hot water system, which is implemented by using a hot water system, wherein the hot water system includes a heating water tank 1, an insulation water tank 2, a solar water heating component 3, a variable frequency heat pump component, and a detection control element;

[0065] Wherein, the solar water heating component is connected to the heating water tank 1;

[0066] The heat preservation water tank 2 is connected to the heating water tank 1 and the user side 4 respectively;

[0067] The variable frequency heat pump assembly is connected to both the heating water tank 1 and the insulation water tank 2;

[0068] The detection and control components are arranged on the heating water tank 1, the heat preservation water tank 2, the solar water heating component and the variable frequency heat pump component.

[0069] Specifically, the variable frequency heat pump assembly includes electric auxiliary heating 5, variable frequency heat pump unit 6, and variable frequency water pump 7, which are arranged in sequence; the solar water heater assembly 3 includes a solar water heater. The detection and control components include a pressure sensor, a temperature sensing package, a solenoid valve, a liquid level sensor, and the like.

[0070] Before starting the hot water system, set parameters on the hot water system control page, including setting the target temperature of each water tank and the total daily hot water consumption based on user habits;

[0071] Specifically, the control method of the hot water system includes the following steps:

[0072] Step S1, predicting the hot water system load based on the preset daily total hot water consumption and the next day's predicted weather parameters; wherein the hot water system load includes the hourly hot water production and frequency;

[0073] The control method of the present invention is connected with the weather forecast and the customer's hot water usage pattern to predict the hot water usage for the next day, calculate the hot water system load, start the system in advance with the predicted frequency, and adjust the frequency of the variable frequency hot water host to meet the heating demand based on this. It is more energy-efficient, more advanced, more specific, and more practical, with different prediction methods and different time lengths.

[0074] Step S2: Based on the predicted hot water system load, control the hot water system to start up to meet the hourly hot water production demand;

[0075] Considering that weather causes water production, and there is a deviation between the weather forecasted in advance and the weather on the day, in order to improve the control accuracy, in this embodiment, based on the predicted hot water system load, the hot water system is controlled to start to meet the hourly hot water production demand, and the following is also included:

[0076] Calculate the hot water system load correction parameters based on the actual weather parameters of the next day;

[0077] Based on the calculated hot water system load correction parameter and the predicted hot water system load, the actual load of the hot water system is obtained.

[0078] After the actual load of the hot water system is obtained, the hot water system is controlled to produce water according to the actual load.

[0079] Step S3, obtaining parameters in the heating water tank, parameters in the insulation water tank and water production parameters of the solar water heating component; wherein the parameters in the heating water tank include the water supply temperature in the heating water tank and the liquid level in the heating water tank; the parameters in the insulation water tank include the temperature in the insulation water tank and the liquid level in the insulation water tank; the water production parameters of the solar water heating component include the solar water production temperature;

[0080] Step S4, based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank, and the liquid level of the insulation water tank is adjusted;

[0081] Specifically, based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank, and the liquid level of the insulation water tank is adjusted, including:

[0082] Obtain the running time of the hot water system to determine the water use period; in this embodiment, the time period is divided into two time periods, one is from 13:00 to 22:00 on the same day, and the other is from 22:00 on the same day to 13:00 the next day;

[0083] Furthermore, the operation time of the hot water system is obtained to determine the water use period, including:

[0084] When the hot water system runs from 22:00 to 13:00 the next day, it is considered as a low water consumption period;

[0085] When the hot water system runs from 13:00 to 22:00, it is considered a high water usage period.

[0086] Based on the water usage period, obtain the set liquid level value of the insulation water tank;

[0087] As a further improvement of the present invention, based on the water use period, obtaining the set liquid level value of the thermal insulation water tank includes:

[0088] When it is judged to be a low water consumption period, the set liquid level value in the thermal insulation water tank is low;

[0089] When it is determined to be a high water usage period, the set liquid level value in the thermal insulation water tank is high.

[0090] It should be noted that the hot water system has pre-set corresponding parameters such as temperature and liquid level according to parameters such as user water use habits, and only needs to be called up during operation; considering that the present invention divides the operating period into two time periods, the preset liquid level value is also two values; and the liquid level in the insulated water tank can be divided into multiple gears, not limited to two gears, for example, it can be divided into four gears. During the low water use period, the liquid level in the insulated water tank can be set lower, and there is no need to store excess hot water. At this time, the set liquid level value can be 1-2 gears; during the high water use period, considering the large water consumption, it is recommended to store more hot water in the insulated water tank, and the set liquid level value can be 3-4 gears; that is, the liquid level value can be within the gear range, not higher than the highest gear and not lower than the lowest gear; and in order to ensure that there is no situation where there is no hot water when the hot water system is used, in this embodiment, gear 1 is higher than the lowest liquid level value in the insulated water tank, that is, even in the low water use period, when the hot water in the insulated water tank is used to gear 1, there is actually still a certain amount of hot water in the insulated water tank for use, and there is a design margin.

[0091] Get the actual liquid level value in the insulation water tank;

[0092] Compare the liquid level value in the insulation water tank with the set liquid level value of the insulation water tank;

[0093] Compare the water supply temperature T1 in the heating water tank with the target water temperature T6 set in the heating water tank;

[0094] Water replenishment control is carried out based on the comparison results of liquid level and water temperature.

[0095] As a further improvement of the present invention, water replenishment control is performed based on the comparison results of the liquid level and the water temperature, including:

[0096] When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the low level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank;

[0097] When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is higher than the low-level liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water;

[0098] When the hot water system is running in a low-water consumption period, when the water supply temperature of the heating water tank T1 is less than the set temperature of the heating water tank T6 + △T6, the hot water system continues to operate to increase the water supply temperature of the heating water tank;

[0099] When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the high level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank;

[0100] When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level value in the insulation water tank is higher than the high-end liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water;

[0101] When the hot water system is running in a high-water consumption period, when the water supply temperature T1 of the heating water tank is less than the set temperature T6+△T6 of the heating water tank, the hot water system continues to run to increase the water supply temperature of the heating water tank;

[0102] Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

[0103] Furthermore, the value range of the first temperature difference ΔT6 is set to be: 0°C≤ΔT6≤10°C; and / or, the value range of the second temperature difference ΔT1 is set to be: 0°C≤ΔT1≤10°C.

[0104] As a further improvement of the present invention, after opening valve F5 to supply the hot water in the heating water tank to the heat preservation water tank, the present invention further comprises:

[0105] Get the real-time supply water temperature in the heating water tank;

[0106] When the real-time supply water temperature in the heating water tank reaches the maximum limit temperature, the water supply solenoid valve is opened to start supplying water to the heating water tank;

[0107] Obtain the temperature of the water after filling in the heating water tank and the filling water level value in the heating water tank;

[0108] When the temperature of the replenished water in the heating water tank drops to the lowest limit temperature, or when the replenished water level in the heating water tank reaches the highest level, the replenished water solenoid valve is controlled to close to stop replenishing water.

[0109] Step S5: switching the water production mode of the hot water system based on the water production parameters of the solar water heating assembly.

[0110] As a further improvement of the present invention, based on the water production parameters of the solar water heating assembly, the water production mode of the hot water system is switched, including:

[0111] Obtaining water temperature parameters of water produced by the solar water heater assembly; wherein the water temperature parameters include the water supply temperature T4 of the solar water heater;

[0112] When the water temperature parameter is less than the set water supply temperature of the solar water heater T1+△T1, it switches to the hot water production mode with only the variable frequency heat pump component running;

[0113] When the water temperature parameter is ≥ the set water supply temperature of the solar water heater T1+△T1 (0℃≤T1, T4≤65℃, 0℃≤ΔT1≤10℃, adjustable), it switches to the hot water production mode where only the solar water heater components are running; then the water temperature parameter is compared with the set temperature T6 of the heating water tank again;

[0114] When the water temperature parameter is ≥ the set temperature of the heating water tank T6 + △T6, only the solar water heating component will operate in the hot water production mode;

[0115] When the water temperature parameter is less than the set temperature of the heating water tank T6+△T6, the solar water heating component and the variable frequency heat pump component are switched to the hot water production mode at the same time;

[0116] Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

[0117] As a further improvement of the present invention, the first temperature difference ΔT6 is set to a value range of: 0°C≤ΔT6≤10°C; and / or, the second temperature difference ΔT1 is set to a value range of: 0°C≤ΔT1≤10°C.

[0118] The control method of the present invention adjusts the actual water supply temperature and water production capacity of the main unit based on future outdoor meteorological parameters and heat consumption changes, realizes the function of load prediction, links solar energy with air source variable frequency water heater and variable frequency water pump, gives priority to solar energy for hot water supply, and uses variable frequency water heater to supplement when it is insufficient, further reduces the energy consumption of the system, divides different liquid levels according to the amount of hot water used and the time period of the day, meets the hot water demand while reducing the energy consumption of the system.

[0119] like Figure 2 As shown, the present invention provides a hot water system for executing the above control method, the hot water system comprises a heating water tank 1, an insulation water tank 2, a solar water heating component 3, a variable frequency heat pump component and a detection control element; wherein:

[0120] The solar water heating component 3 is connected to the heating water tank 1;

[0121] The heat preservation water tank 2 is connected to the heating water tank 1 and the user side 4 respectively;

[0122] The variable frequency heat pump assembly is connected to both the heating water tank 1 and the insulation water tank 2;

[0123] The detection and control components are arranged on the heating water tank 1, the heat preservation water tank 2, the solar water heating component 3 and the variable frequency heat pump component. The solar water heating component 3 includes a solar water heater.

[0124] As a further improvement of the present invention, the variable frequency heat pump assembly includes an electric auxiliary heater 5, a variable frequency heat pump unit 6, and a variable frequency water pump 7 which are arranged in sequence.

[0125] When the hot water system of the present invention is in use, the solar water heater preferentially heats the cold water in the heating water tank 1, and after reaching a preset temperature, the cold water enters the insulated water tank 2. At the same time, the variable frequency heat pump unit 6 is responsible for keeping the hot water in the insulated water tank 2 warm and, when solar energy is insufficient, heating the warm water in the heating water tank 1 to high-temperature water and supplying it to the insulated water tank 2. In addition, the insulated water tank 2 is provided with different water level switches, which can be set according to the heat demand at the end, and the load matching is higher.

[0126] The hot water system predicts the hourly hot water production of the hot water system based on the hourly outdoor weather conditions and the amount of hot water used on the next day, and corrects the hot water production of the hot water system based on the actual outdoor temperature on the next day, and meets the hourly hot water production demand by adjusting the frequency of the hot water system; the hot water supply liquid level is adjusted based on the solar water heater and the variable frequency heat pump unit, and the 1-2 level is used between 22:00 and 13:00 the next day, and the 3-4 level is used at other times, ensuring the heat demand while achieving energy saving; and the heating water tank is constantly replenished as long as it has not reached the maximum liquid level, and the hot water is input into the insulation water tank after reaching the full liquid level and the temperature reaches the preset temperature. It should be noted that the liquid level is not necessarily divided into only 4 levels, and a large system can select more levels according to the daily water consumption. The present invention takes 4 levels as an example for specific description.

[0127] Embodiment 1:

[0128] like Figure 3 As shown, the control process of the hot water system of the present invention is:

[0129] Before the hot water system is turned on, a load forecast is conducted. The outdoor hourly weather conditions for the next day are obtained through the local weather system. The hourly hot water production and frequency of a single variable frequency heat pump unit are predicted based on the total daily hot water consumption (total daily hot water consumption / heating time / number of variable frequency heat pump units). The system is turned on at the preset frequency.

[0130] Since the hot water production of the variable frequency heat pump unit is affected by the outdoor temperature, it is necessary to correct the hot water production of the variable frequency heat pump unit according to the actual outdoor temperature of the next day, and meet the hourly hot water production demand by adding or subtracting the frequency of the variable frequency heat pump unit on the preset frequency.

[0131] After the load calculation is completed, the system is started 2 hours in advance according to the earliest hot water use time setting. After the hot water system runs according to the corrected load parameters, liquid level adjustment is required;

[0132] The specific adjustment method is:

[0133] If the water supply temperature T1 of the heating water tank ≥ the set water temperature T6 + △T6 (0℃≤T1, T6≤65℃, 0℃≤ΔT6≤10℃, where ΔT6 and T6 temperatures are adjustable); that is, the hot water in the heating water tank meets the preset temperature (T6) requirement, then valve F5 is opened to supply the hot water in the heating water tank to the insulation water tank. At this time, the liquid level in the heating water tank decreases. When the temperature rises to the maximum of 65 degrees (anti-scalding), the water replenishment solenoid valve starts replenishing water. When the temperature of the heating water tank drops to 50℃ or the liquid level in the heating water tank reaches the maximum value (Y4), the water replenishment solenoid valve is closed.

[0134] When the solar water heater water supply temperature T4 ≥ the solar water heater set water supply temperature T1 + △T1 (0℃ ≤ T1, T4 ≤ 65℃, 0℃ ≤ △T1 ≤ 10℃, adjustable), the solar water heater water pump B-4 is turned on to heat the hot water with solar energy; if the solar energy cannot meet the heating of the water in the water tank to the preset temperature, that is, the solar water heater water supply temperature T4 < the solar water heater set water supply temperature T1 + △T1, the variable frequency heat pump unit is turned on for heating, and the variable frequency heat pump unit's ability to produce hot water is adjusted according to the preset frequency and the difference between the actual outdoor temperature and the predicted outdoor temperature (i.e., frequency modulation);

[0135] The liquid level of the insulation water tank is adjusted according to the preset time period. The 1-2 level is maintained from 22:00 to 13:00 the next day. A margin is left between the 1 level and the lowest level to prevent water production in time. When the insulation water tank level is detected to be higher than the 2 level, the unit will shut down water production and only allow solar energy to produce water.

[0136] When it is between 13:00 and 22:00, the liquid level is maintained at level 3-4 (considering that there will be water demand at 23:00, the water between level 3 and level 2 is just used up, and the unit does not need to heat it afterwards). After 13:00, the unit continues to produce water according to the predicted water production until the water tank level reaches the maximum level.

[0137] The design allocates the host frequency in advance through load forecasting and makes corrections based on actual outdoor meteorological parameters to avoid energy waste. At the same time, variable frequency heat pump units and solar water heaters are used to adjust the liquid level of the insulation water tank, ultimately achieving energy-saving operation of the hot water system.

[0138] The present invention is a hot water system based on load prediction linked variable liquid level regulation. For large hot water systems, it can be considered that the energy saving effect can be further improved by increasing the number of liquid levels.

[0139] The hot water system of the present invention is applied to various places where hot water supply is required. The actual water supply temperature and water production capacity of the main unit are adjusted based on future outdoor meteorological parameters to realize the function of load prediction. At the same time, solar energy and air source variable frequency water heaters are linked, solar energy is used for hot water supply first, and different liquid levels are divided according to the amount of hot water used and the time period of each day, so as to meet the demand for hot water while reducing the system energy consumption by more than 20%, solving the problem that the traditional hot water system design only configures fixed frequency units according to the maximum hot water demand, the units are frequently added and reduced during partial load, the system energy consumption is high, and there is no load prediction function, solving the problem that the traditional hot water system uses a fixed frequency water pump and has high energy consumption during partial load, and solving the problem that the traditional hot water system uses a fixed liquid level, cannot change the liquid level according to the heat demand, has poor adjustment ability and high energy consumption.

[0140] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0141] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0142] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0143] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0144] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0145] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0146] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control method, characterized in that: The hot water system is used for implementation. The hot water system includes a heating water tank, an insulation water tank, a solar water heater component and a variable frequency heat pump component. The target temperature of each water tank and the total daily hot water consumption are preset before the hot water system is started. The control method includes the following steps: Based on the preset daily total hot water consumption and the next day's predicted weather parameters, the hot water system load is predicted; wherein the hot water system load includes the hourly hot water production and frequency; Based on the predicted hot water system load, control the hot water system startup to meet the hourly hot water production demand; Obtain the parameters in the heating water tank, the parameters in the insulation water tank and the water production parameters of the solar water heating component; Based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank to adjust the liquid level of the insulation water tank; Based on the water production parameters of the solar water heating components, switch the water production mode of the hot water system.

2. The method according to claim 1, characterized in that: Before controlling the hot water system to start based on the predicted hot water system load to meet the hourly hot water production demand, the method further includes: Calculate the hot water system load correction parameters based on the actual weather parameters of the next day; Based on the calculated hot water system load correction parameter and the predicted hot water system load, the actual load of the hot water system is obtained.

3. The method according to claim 1, characterized in that Based on the parameters in the heating water tank, the parameters in the insulation water tank and the running time of the hot water system, the heating water tank is controlled to replenish water into the insulation water tank and the liquid level of the insulation water tank is adjusted, including: Obtain the running time of the hot water system to determine the water usage period; Based on the water usage period, obtain the set liquid level value of the insulation water tank; Get the liquid level value in the insulation water tank; Compare the liquid level value in the insulation water tank with the set liquid level value of the insulation water tank; Compare the water supply temperature T1 in the heating water tank with the target water temperature T6 set in the heating water tank; Water replenishment control is carried out based on the comparison results of liquid level and water temperature.

4. The method according to claim 3, characterized in that The step of obtaining the running time of the hot water system to determine the water use period includes: When the hot water system runs from 22:00 to 13:00 the next day, it is considered as a low water consumption period; When the hot water system runs from 13:00 to 22:00, it is considered a high water usage period.

5. The method according to claim 4, characterized in that The step of obtaining a set liquid level value of the thermal insulation water tank based on the water use period includes: When it is judged to be a low water consumption period, the set liquid level value in the thermal insulation water tank is low; When it is determined to be a high water usage period, the set liquid level value in the thermal insulation water tank is high.

6. The method according to claim 5, characterized in that The water replenishment control based on the comparison results of the liquid level and the water temperature includes: When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the low level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank; When the hot water system is running in the low water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is higher than the low-level liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water; When the hot water system is running in a low-water consumption period, when the water supply temperature of the heating water tank T1 is less than the set temperature of the heating water tank T6 + △T6, the hot water system continues to operate to increase the water supply temperature of the heating water tank; When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level in the insulation water tank is lower than the high level, open the valve F5 to supply the hot water in the heating water tank to the insulation water tank; When the hot water system is running in the high water consumption period, the water supply temperature T1 of the heating water tank ≥ the set temperature T6 + △T6 of the heating water tank, and the liquid level value in the insulation water tank is higher than the high-end liquid level, the variable frequency heat pump component is controlled to stop producing hot water, and the solar water heating component is kept producing hot water; When the hot water system is running in a high-water consumption period, when the water supply temperature T1 of the heating water tank is less than the set temperature T6+△T6 of the heating water tank, the hot water system continues to run to increase the water supply temperature of the heating water tank; Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

7. The method according to claim 6, characterized in that After the valve F5 is opened to supply the hot water in the heating water tank to the heat preservation water tank, the method further includes: Get the real-time supply water temperature in the heating water tank; When the real-time supply water temperature in the heating water tank reaches the maximum limit temperature, the water supply solenoid valve is opened to start supplying water to the heating water tank; Obtain the temperature of the water after filling in the heating water tank and the filling water level value in the heating water tank; When the temperature of the replenished water in the heating water tank drops to the lowest limit temperature, or when the replenished water level in the heating water tank reaches the highest level, the replenished water solenoid valve is controlled to close to stop replenishing water.

8. The method according to claim 1, characterized in that The method of switching the water production mode of the hot water system based on the water production parameters of the solar water heating component includes: Obtain water temperature parameters of water produced by solar water heating components; When the water temperature parameter is less than the set water supply temperature of the solar water heater T1+△T1, it switches to the hot water production mode with only the variable frequency heat pump component running; When the water temperature parameter is ≥ the set water supply temperature of the solar water heater T1+△T1, the mode is switched to the hot water production mode where only the solar water heating component operates; then the water temperature parameter is compared with the set temperature T6 of the heating water tank again; When the water temperature parameter is ≥ the set temperature of the heating water tank T6 + △T6, only the solar water heating component will operate in the hot water production mode; When the water temperature parameter is less than the set temperature of the heating water tank T6+△T6, the solar water heating component and the variable frequency heat pump component are switched to the hot water production mode at the same time; Among them, △T6 is set for the first temperature difference, and △T1 is set for the second temperature difference.

9. The method according to claim 8, characterized in that The value range of the set first temperature difference ΔT6 is: 0°C≤ΔT6≤10°C; and / or the value range of the set second temperature difference ΔT1 is: 0°C≤ΔT1≤10°C.

10. A hot water system, characterized in that: Used to execute the control method as described in any one of claims 1 to 9, the hot water system includes a heating water tank, an insulation water tank, a solar water heating component, a variable frequency heat pump component and a detection control element; wherein: The solar water heating component is connected to the heating water tank; The thermal insulation water tank is respectively connected to the heating water tank and the user side; The variable frequency heat pump assembly is connected to both the heating water tank and the insulation water tank; The detection control element is arranged on the heating water tank, the heat preservation water tank, the solar water heating component and the variable frequency heat pump component.

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