A heat calculation method for a solar water heater

Abstract

The present application provides a method for calculating the heat of a solar water heater. Wherein, the method includes: obtaining the electrical energy heat and solar energy heat of the solar water heater; determining the variable factor coefficients corresponding to the electrical energy heat and the solar energy heat respectively; performing weighted calculation through the electrical energy heat, the solar energy heat and their respective corresponding variable factor coefficients to obtain a weighted sum, and dividing the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater.

Description

Technical Field

[0001] This application relates to the technical field of water heaters, and in particular to a method for calculating the heat of a solar water heater. Background Art

[0002] Water heaters are one of the commonly used household appliances in our daily life. They can provide hot water for us to meet the needs of taking baths, washing dishes, etc. in our daily life. The working principle of a water heater is to convert electrical energy into heat energy. During the design and selection process of a water heater, it is necessary to calculate the electrical heat of the water heater to ensure that it can meet the hot water demand of users. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide at least a method for calculating the heat of a solar water heater, which is used to improve the accuracy of calculating the heat of a solar water heater, and further improve the accuracy of estimating the required heating time of a solar water heater.

[0004] This application mainly includes the following aspects:

[0005] In the first aspect, an embodiment of this application provides a method for calculating the heat of a solar water heater, and the method includes:

[0006] Obtain the electrical heat and solar heat of the solar water heater;

[0007] Determine the variable factor coefficients corresponding to the electrical heat and the solar heat respectively;

[0008] Perform weighted calculation through the electrical heat, the solar heat and their respective variable factor coefficients to obtain a weighted sum, and divide the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater.

[0009] In a possible implementation manner, the obtaining of the electrical heat of the solar water heater includes:

[0010] Calculate the electrical heat through the formula Q1 = (cm△t1 + cm△t2 + … + cm△tn);

[0011] Wherein, Q1 is the electrical heat, c represents specific heat capacity, m represents mass, and △tn is the temperature difference in the nth time period.

[0012] In a possible implementation manner, the obtaining of the solar heat of the solar water heater includes:

[0013] Calculate the solar heat through the formula Q2 = (cs△t1 + cs△t2 + … + cs△tn);

[0014] Among them, Q2 is the solar heat, c represents the specific heat capacity, s represents the heat absorption area, and △tn is the temperature difference in the nth time period.

[0015] In a possible implementation manner, the method further includes:

[0016] Obtain the temperature values of three paths corresponding to the first time point and the last time point in the nth time period respectively;

[0017] Calculate the average value of the temperature values of the three paths at the first time point to obtain the first temperature value, and calculate the average value of the temperature values of the three paths at the last time point to obtain the second temperature value;

[0018] Calculate the first temperature value and the second temperature value to obtain the temperature difference in the nth time period.

[0019] In a possible implementation manner, the determining the variable factor coefficients corresponding to the electric energy heat and the solar heat respectively includes:

[0020] Based on the water tank capacity, solar panel absorption efficiency, and heating efficiency of the solar water heater, calculate the variation relationships between the hot water temperature change per unit time and the electric energy heat and the solar heat respectively;

[0021] Determine the variable factor coefficient of the electric energy heat according to the variation relationship between the hot water temperature change and the electric energy heat;

[0022] Determine the variable factor coefficient of the solar heat according to the variation relationship between the hot water temperature change and the solar heat.

[0023] In a possible implementation manner, the calculating the variation relationships between the hot water temperature change per unit time and the electric energy heat and the solar heat respectively based on the water tank capacity, solar panel absorption efficiency, and heating efficiency of the solar water heater includes:

[0024] Obtain the historical data of the solar water heater, where the historical data includes the water tank capacity, solar panel absorption efficiency, heating efficiency, and hot water temperature change per unit time;

[0025] Perform linear fitting according to the historical data to obtain a first linear fitting formula and a second linear fitting formula;

[0026] Obtain the variation relationship between the hot water temperature change per unit time and the electric energy heat through the first linear fitting formula; obtain the variation relationship between the hot water temperature change per unit time and the solar heat through the second linear fitting formula.

[0027] In a possible implementation manner, determining the variable factor coefficient of the electrical energy heat according to the relationship between the change in the hot water temperature and the change in the electrical energy heat includes:

[0028] Determining the variable factor coefficient of the electrical energy heat according to the linear fitting coefficient in the first linear fitting formula.

[0029] In a possible implementation manner, determining the variable factor coefficient of the solar energy heat according to the relationship between the change in the hot water temperature and the change in the solar energy heat includes:

[0030] Determining the variable factor coefficient of the solar energy heat according to the linear fitting coefficient in the second linear fitting formula.

[0031] In a second aspect, an embodiment of the present application further provides a heat calculation device for a solar water heater, and the device includes:

[0032] An acquisition module, configured to acquire the electrical energy heat and the solar energy heat of the solar water heater;

[0033] A determination module, configured to determine the variable factor coefficients corresponding to the electrical energy heat and the solar energy heat respectively;

[0034] A calculation module, configured to perform weighted calculation through the electrical energy heat, the solar energy heat and their respective corresponding variable factor coefficients to obtain a weighted sum, and divide the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater.

[0035] In a third aspect, an embodiment of the present application further provides a solar water heater, and the solar water heater includes: a heat pump unit, a water tank, a processor and a memory; the memory stores a computer program; when the processor executes the computer program stored in the memory, the heat calculation method of the solar water heater described above is implemented to control the heat pump unit; the heat pump unit is used to heat the water in the water tank.

[0036] In a fourth aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory and a bus, the memory stores machine-readable instructions executable by the processor, when the electronic device runs, communication is carried out between the processor and the memory through the bus, and when the machine-readable instructions are run by the processor, the steps of the heat calculation method of the solar water heater described in the first aspect or any possible implementation manner in the first aspect are executed.

[0037] Fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the steps of calculating and controlling the heat of the solar water heater described in the first aspect or any possible implementation manner of the first aspect.

[0038] A method for calculating the heat of a solar water heater provided by an embodiment of the present application first obtains the electrical energy heat and solar energy heat of the solar water heater; then determines the variable factor coefficients corresponding to the electrical energy heat and the solar energy heat respectively; finally, performs a weighted calculation through the electrical energy heat, the solar energy heat and their respective variable factor coefficients to obtain a weighted sum, and divides the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater. Thus, the heat calculation of the solar water heater is realized through the present application, so that the accuracy of the heat calculation of the solar water heater can be improved through the present application, and further the accuracy of estimating the time required for the solar water heater to generate heat can be improved.

[0039] To make the above objects, features and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 Shows a flowchart of a method for calculating the heat of a solar water heater provided by an embodiment of the present application;

[0042] Figure 2 Shows a structural block diagram of a device for calculating the heat of a solar water heater provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. It should be understood that the accompanying drawings in this application are only for the purposes of illustration and description, and are not used to limit the protection scope of this application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without a logical context relationship may be reversed or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of this application.

[0044] In addition, the described embodiments are only some embodiments of this application, rather than all embodiments. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application claimed, but merely represents selected embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of this application.

[0045] Please refer to Figure 1 , Figure 1 which is a flowchart of a method for calculating the heat of a solar water heater provided by an embodiment of this application. As Figure 1 shown, an embodiment of this application provides a method for calculating the heat of a solar water heater, and the method includes the following steps:

[0046] S101, obtain the electric energy heat and solar energy heat of the solar water heater.

[0047] In this embodiment, obtaining the electric energy heat of the solar water heater includes: calculating the electric energy heat through the formula Q1 = (cm△t1 + cm△t2 + … + cm△tn); where Q1 is the electric energy heat, c represents specific heat capacity, m represents mass, and △tn is the temperature difference in the nth time period. Further, in this embodiment, after calculating the electric energy heat, the electric energy consumption W is corrected and compared through the heating tube power and the running time. Ignoring the case of energy loss, Q≈W = PT, where W refers to the electric quantity, P refers to the heating tube power, and T refers to the starting and running time of the electric heating tube.

[0048] In this embodiment, obtaining the solar heat of the solar water heater includes: calculating the solar heat through the formula Q2 = (cs△t1 + cs△t2 + … + cs△tn); where Q2 is the solar heat, c represents specific heat capacity, s represents the heat absorption area, and △tn is the temperature difference in the nth time period. The duration of the time period can be specifically set according to actual needs, such as 5 minutes, 10 minutes, 15 minutes, etc., and this embodiment does not make specific limitations on this.

[0049] It should be noted that the way to obtain the temperature difference in this application is as follows: obtain the temperature values of three paths corresponding to the first time point and the last time point in the nth time period respectively; calculate the average value of the temperature values of the three paths at the first time point to obtain the first temperature value, and calculate the average value of the temperature values of the three paths at the last time point to obtain the second temperature value; calculate the first temperature value and the second temperature value to obtain the temperature difference in the nth time period. Among them, the temperature values of the three paths are the temperature values at three different positions inside the solar water heater. For example, in this embodiment, the temperature values are obtained by collecting the water temperatures of three paths (T1, T2, T3), the collection medium is a thermistor, the collection frequency is 3 times per minute, and the collected values are converted into an RT parameter comparison table to form observable temperature values and calculable temperature values, so as to calculate the temperature difference in the nth time period according to the obtained temperature values.

[0050] For example, the temperature values of the three paths at the first time point are respectively: 10°C, 12°C, 11°C, and the first temperature value obtained by the averaging method is 11°C. The temperature values of the three paths at the last time point are 12°C, 13°C, 14°C respectively, then the second temperature value obtained through calculation is 13°C, and the finally obtained temperature difference is 3°C.

[0051] S102, determine the variable factor coefficients corresponding to the electric energy heat and the solar heat respectively.

[0052] Among them, the variable factor coefficients corresponding to the electric energy heat and the solar heat are set based on comprehensive factors such as the water tank capacity, the absorption efficiency of the solar panel, and the heating efficiency, and the relationship between the change in the hot water temperature per unit time and the change in the total amount of hot water is calculated.

[0053] Specifically, in this embodiment, the opening time of the circulation pump and the temperature rise are detected, and the opening of the circulation pump is equivalently replaced with electric heating. It is understood that the variable factor coefficient is a ratio and also a variable. And during the experimental stage, it is measured that when the circulation pump is turned on for 1 hour, the temperature rises by 10 degrees, while when the electric heating starts for 10 minutes, the temperature rises by 10 degrees, and a variable value is given according to such a ratio. Finally, in the case of software logic failure, a variable factor is considered fixed, such as setting the variable factor coefficient to 10, or manually calibrating the variable factor coefficient.

[0054] In an optional embodiment provided by the application, determining the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively includes:

[0055] S1021. Calculate the variation relationships between the change in hot water temperature per unit time and the electric energy heat and the solar energy heat respectively based on the water tank capacity, solar panel absorption efficiency, and heating efficiency of the solar water heater.

[0056] Specifically, calculating the variation relationships between the change in hot water temperature per unit time and the electric energy heat and the solar energy heat respectively based on the water tank capacity, solar panel absorption efficiency, and heating efficiency of the solar water heater includes: obtaining the historical data of the solar water heater, where the historical data includes the water tank capacity, solar panel absorption efficiency, heating efficiency, and change in hot water temperature per unit time; performing linear fitting according to the historical data to obtain a first linear fitting formula and a second linear fitting formula; obtaining the variation relationship between the change in hot water temperature per unit time and the electric energy heat through the first linear fitting formula; and obtaining the variation relationship between the change in hot water temperature per unit time and the solar energy heat through the second linear fitting formula.

[0057] It should be noted that the basic principle of a solar water heater is to use sunlight to irradiate the collector, convert solar energy into heat energy through the collector, transfer the heat energy to the storage water tank through pipelines, and finally achieve the purpose of heating water. When calculating the water temperature, the following factors need to be considered: the collector area and design parameters (such as the type and material of the collector); the solar radiation intensity and direction (such as seasons, weather, etc.); the hot water tank volume and design parameters (such as the shape and size of the hot water tank); the pipeline length and design parameters (such as the diameter of the pipeline, insulation layer, etc.).

[0058] According to the above factors, some empirical formulas are used to calculate the water temperature of the solar water heater: the formula for the relationship between light intensity and temperature: I = k * T, where I is the light intensity, k is a constant, and T is the ambient temperature; the formula for the heat absorption coefficient of the collector: α = η * ε, where α is the heat absorption coefficient of the collector, η is the solar radiation coefficient, and ε is the absorption coefficient of the collector; the formula for the heat dissipation coefficient of the hot water tank: β = α * C, where β is the heat dissipation coefficient of the hot water tank and C is the specific heat capacity of the hot water tank.

[0059] Suppose there is a collector with an area of 2 square meters, a solar radiation intensity of 500 watts per square meter, a hot water tank volume of 50 liters, and a pipeline length of 10 meters. According to the above formulas, the following calculations are carried out:

[0060] Relationship between light intensity and temperature: I = k * T, where k is a constant and T is the temperature. The value of k can be obtained through experimental measurement and then substituted into the formula to calculate the light intensity I.

[0061] Formula for the heat absorption coefficient of the collector: α = η * ε, where η is the solar radiation coefficient and ε is the absorption coefficient of the collector. According to empirical data, we can get that η is about 0.7 and ε is about 0.9. Therefore, α = η * ε = 0.7 * 0.9 = 0.63.

[0062] Formula for the heat dissipation coefficient of the hot water tank: β = α * C, where β is the heat dissipation coefficient of the hot water tank and C is the specific heat capacity of the hot water tank. According to empirical data, we can get that C is about 4.2 kJ / (kg·°C). Therefore, β = α * C = 0.63 * 4.2 = 2.64.

[0063] Assume that the total solar radiation energy received by the collector is G (W / ㎡), then the heat absorbed by the collector is G×ηc. At the same time, the hot water tank will dissipate heat to the outside due to the temperature difference. Let the initial temperature of the water tank be T0 and the ambient temperature be Ta, then the heat dissipation per hour of the water tank is (T0 - Ta)×ηL.

[0064] Assume that within a certain time period ΔT, the heat absorbed by the collector is all used to heat the water, and other heat losses (such as pipeline heat loss, etc.) are not considered. Then the increase in water temperature Δt within this time period can be calculated by the following formula: Δt = (G×ηc×ΔT) / (mc) - (T0 - Ta)×ηL×ΔT / m, where m is the mass of water in the water tank (kg) and c is the specific heat capacity of water [J / (kg·°C)].

[0065] Since the change in water temperature will affect the heat dissipation of the water tank, the above formula is a non-linear equation about ΔT. It can be solved by the iterative method or numerical method to obtain the curve of water temperature change with time. In summary, calculating the temperature of a solar water heater based on the heat absorption coefficient of the collector and the heat dissipation coefficient of the hot water tank is a problem involving multiple variables and a complex heat transfer process, which requires establishing a reasonable mathematical model and using appropriate numerical methods for solution.

[0066] S1022, determine the variable factor coefficient of the electric energy heat according to the relationship between the change of the hot water temperature and the change of the electric energy heat.

[0067] Specifically, the determining the variable factor coefficient of the electric energy heat according to the relationship between the change of the hot water temperature and the change of the electric energy heat includes: determining the variable factor coefficient of the electric energy heat according to the linear fitting coefficient in the first linear fitting formula.

[0068] S1023. Determine the variable factor coefficient of the solar energy heat according to the relationship between the change in the hot water temperature and the change in the solar energy heat.

[0069] Specifically, determining the variable factor coefficient of the solar energy heat according to the relationship between the change in the hot water temperature and the change in the solar energy heat includes: determining the variable factor coefficient of the solar energy heat according to the linear fitting coefficient in the second linear fitting formula.

[0070] S103. Perform weighted calculation on the electric energy heat, the solar energy heat and their respective variable factor coefficients to obtain a weighted sum, and divide the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater.

[0071] Specifically, the total heat Q_total of the solar water heater = (i * Q1 + j * Q2) / (i + j), where Q1 is the electric energy heat, Q2 is the solar energy heat, i is the variable factor coefficient of the electric energy heat, and j is the variable factor coefficient of the solar energy heat. That is, in this embodiment, the total heat of the solar water heater is calculated by weighted average, where the weights i and j are selected according to the variable factor coefficients, and the coefficient factors are set based on comprehensive factors such as the water tank capacity, the absorption efficiency of the solar panel, and the heating efficiency, and the relationship between the change in the hot water temperature and the change in the total hot water volume per unit time is calculated.

[0072] A heat calculation method for a solar water heater provided by an embodiment of the present application first obtains the electric energy heat and the solar energy heat of the solar water heater; then determines the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively; and finally performs weighted calculation on the electric energy heat, the solar energy heat and their respective variable factor coefficients to obtain a weighted sum, and divides the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater. Thus, through the present application, the heat calculation of the solar water heater is realized, so that the accuracy of the heat calculation of the solar water heater can be improved through the present application, and further the accuracy of the estimation of the heating time required for the solar water heater can be improved.

[0073] In the case of dividing into respective functional modules corresponding to each function, Figure 2 shows a possible composition schematic diagram of the heat calculation device of the solar water heater involved in the above and embodiments, as Figure 2 shown, the heat calculation device of the solar water heater may include:

[0074] An acquisition module 21, configured to acquire the electric energy heat and the solar energy heat of the solar water heater;

[0075] A determination module 22, configured to determine the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively;

[0076] A calculation module 23, configured to perform weighted calculation on the electric energy heat, the solar energy heat, and their respective variable factor coefficients to obtain a weighted sum, and divide the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater.

[0077] In a possible implementation manner, the obtaining module 21 is specifically configured to:

[0078] Calculate the electric energy heat through the formula Q1 = (cm△t1 + cm△t2 + … + cm△tn);

[0079] Wherein, Q1 is the electric energy heat, c represents specific heat capacity, m represents mass, and △tn is the temperature difference in the nth time period.

[0080] In a possible implementation manner, the obtaining module 21 is specifically configured to:

[0081] Calculate the solar energy heat through the formula Q2 = (cs△t1 + cs△t2 + … + cs△tn);

[0082] Wherein, Q2 is the solar energy heat, c represents specific heat capacity, s represents heat absorption area, and △tn is the temperature difference in the nth time period.

[0083] In a possible implementation manner, the obtaining module 21 is further configured to:

[0084] Obtain the temperature values of three paths corresponding to the first time point and the last time point in the nth time period respectively;

[0085] Calculate the average value of the temperature values of the three paths at the first time point to obtain a first temperature value, and calculate the average value of the temperature values of the three paths at the last time point to obtain a second temperature value;

[0086] Calculate the first temperature value and the second temperature value to obtain the temperature difference in the nth time period.

[0087] In a possible implementation manner, the determining module 22 is specifically configured to:

[0088] Based on the water tank capacity, the solar panel absorption efficiency, and the heating efficiency of the solar water heater, calculate the variation relationships between the change in hot water temperature per unit time and the electric energy heat and the solar energy heat respectively;

[0089] Determine the variable factor coefficient of the electric energy heat according to the variation relationship between the hot water temperature change and the electric energy heat;

[0090] Determine the variable factor coefficient of the solar energy heat according to the variation relationship between the hot water temperature change and the solar energy heat.

[0091] In a possible implementation, the determining module 22 is specifically configured to:

[0092] Obtain historical data of the solar water heater, where the historical data includes water tank capacity, solar panel absorption efficiency, heating efficiency, and change in hot water temperature per unit time;

[0093] Perform linear fitting based on the historical data to obtain a first linear fitting formula and a second linear fitting formula;

[0094] Obtain the relationship between the change in hot water temperature per unit time and the change in electric energy heat through the first linear fitting formula; obtain the relationship between the change in hot water temperature per unit time and the change in solar energy heat through the second linear fitting formula.

[0095] In a possible implementation, the determining module 22 is specifically configured to:

[0096] Determine the variable factor coefficient of the electric energy heat according to the linear fitting coefficient in the first linear fitting formula.

[0097] In a possible implementation, the determining module 22 is specifically configured to:

[0098] Determine the variable factor coefficient of the solar energy heat according to the linear fitting coefficient in the second linear fitting formula.

[0099] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be in an electrical, mechanical, or other form.

[0100] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, in each embodiment of the present application, each functional unit may be integrated into one processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit.

[0102] If the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0103] The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for calculating the heat of a solar water heater, characterized in that: The method comprises: Obtain electrical heat and solar heat from solar water heaters; Determine the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively; A weighted sum is obtained by weighting the electric energy heat, the solar energy heat and their corresponding variable factor coefficients, and the weighted sum is divided by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater; The determining of the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively includes: Based on the water tank capacity, solar panel absorption efficiency and heating efficiency of the solar water heater, the relationship between the change in hot water temperature per unit time and the change in the electric energy heat and the solar energy heat is calculated; Determine the variable factor coefficient of the electric energy heat according to the relationship between the change of the hot water temperature and the change of the electric energy heat; Determine the variable factor coefficient of the solar energy heat according to the relationship between the change of the hot water temperature and the change of the solar energy heat; The calculation of the relationship between the change in hot water temperature per unit time and the corresponding change in the electric energy heat and the solar energy heat respectively based on the water tank capacity, solar panel absorption efficiency and heating efficiency of the solar water heater includes: Acquire historical data of the solar water heater, wherein the historical data includes water tank capacity, solar panel absorption efficiency, heating efficiency, and hot water temperature change per unit time; Perform linear fitting based on the historical data to obtain a first linear fitting formula and a second linear fitting formula; The first linear fitting formula is used to obtain the relationship between the change in hot water temperature per unit time and the change in the electric energy heat; the second linear fitting formula is used to obtain the relationship between the change in hot water temperature per unit time and the change in solar energy heat; The variable factor coefficient of the electric energy heat is determined according to the relationship between the change of the hot water temperature and the change of the electric energy heat, including: The variable factor coefficient of the electric energy heat is determined according to the linear fitting coefficient in the first linear fitting formula.

2. The method according to claim 1, characterized in that The method of obtaining electric energy and heat from a solar water heater comprises: The electric energy heat is calculated by the formula Q1= (cm△t1+cm△t2+…+cm△tn); Wherein, Q1 is the electric energy heat, c represents the specific heat capacity, m represents the mass, and Δtn is the temperature difference in the nth time period.

3. The method according to claim 2, characterized in that The method of obtaining solar energy heat from a solar water heater comprises: The solar heat is calculated by the formula Q2= (cs△t1+cs△t2+…+cs△tn); Wherein, Q2 is the solar heat, c represents the specific heat capacity, s represents the heat absorption area, and Δtn is the temperature difference in the nth time period.

4. The method according to claim 3, characterized in that The method further comprises: Obtain the temperature values ​​of the three paths corresponding to the first time point and the last time point in the nth time period respectively; The temperature values ​​of the three paths at the first time point are averaged to obtain a first temperature value, and the temperature values ​​of the three paths at the last time point are averaged to obtain a second temperature value; The first temperature value and the second temperature value are calculated to obtain a temperature difference in the nth time period.

5. The method according to claim 1, characterized in that The step of determining the variable factor coefficient of the solar energy heat according to the relationship between the change in the hot water temperature and the change in the solar energy heat comprises: The variable factor coefficient of the solar heat is determined according to the linear fitting coefficient in the second linear fitting formula.

6. A heat calculation device for a solar water heater, characterized in that: The device comprises: An acquisition module, used for acquiring electric energy heat and solar energy heat of the solar water heater; A determination module, used to determine the variable factor coefficients corresponding to the electric energy heat and the solar energy heat respectively; A calculation module, used for performing weighted calculation on the electric energy heat, the solar energy heat and their corresponding variable factor coefficients to obtain a weighted sum, and dividing the weighted sum by the sum of the two variable factor coefficients to obtain the total heat of the solar water heater; The determination module is specifically used for: Based on the water tank capacity, solar panel absorption efficiency and heating efficiency of the solar water heater, the relationship between the change in hot water temperature per unit time and the change in the electric energy heat and the solar energy heat is calculated; Determine the variable factor coefficient of the electric energy heat according to the relationship between the change of the hot water temperature and the change of the electric energy heat; Determine the variable factor coefficient of the solar energy heat according to the relationship between the change of the hot water temperature and the change of the solar energy heat; The calculation of the relationship between the change in hot water temperature per unit time and the corresponding change in the electric energy heat and the solar energy heat respectively based on the water tank capacity, solar panel absorption efficiency and heating efficiency of the solar water heater includes: Acquire historical data of the solar water heater, wherein the historical data includes water tank capacity, solar panel absorption efficiency, heating efficiency, and hot water temperature change per unit time; Perform linear fitting based on the historical data to obtain a first linear fitting formula and a second linear fitting formula; The first linear fitting formula is used to obtain the relationship between the change in hot water temperature per unit time and the change in the electric energy heat; the second linear fitting formula is used to obtain the relationship between the change in hot water temperature per unit time and the change in solar energy heat; The variable factor coefficient of the electric energy heat is determined according to the relationship between the change of the hot water temperature and the change of the electric energy heat, including: The variable factor coefficient of the electric energy heat is determined according to the linear fitting coefficient in the first linear fitting formula.

7. A solar water heater, characterized in that: The solar water heater comprises: a heat pump unit, a water tank, a processor and a memory; the memory stores a computer program; when the processor executes the computer program stored in the memory, the heat calculation method of the solar water heater described in any one of claims 1 to 5 is implemented to control the heat pump unit; the heat pump unit is used to heat the water in the water tank.

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