Control method and system of zero-cold water circulation, water heater and computer storage medium

Abstract

The application provides a zero-cold-water circulation control method, system, water heater and computer storage medium. The method comprises the following steps: in the heat preservation state of the water heater in circulation heating, determining whether the difference between the set temperature of the water heater and the outlet water temperature is greater than a first difference threshold; if yes, recording the current backwater temperature as a starting point backwater temperature; controlling the water heater to heat and controlling the circulation pump to operate for a preset time length; calculating the temperature average of the backwater temperature in the preset time period; determining the starting condition of the next circulation heating according to the temperature average and the starting point backwater temperature; and starting the next circulation heating when the starting condition of the next circulation heating is met. The application determines the starting condition of the zero-cold-water circulation of the gas water heater, thereby identifying the heat preservation state of the circulation pipeline at the user's home in advance, reducing the influence of the heat preservation performance of the zero-cold-water circulation branch on the water temperature, providing more suitable water temperature for the user, achieving the goal of energy saving and consumption reduction, and improving the user's experience of using the gas water heater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heater temperature control, and in particular to a zero-cold-water circulation control method and system, a water heater, and a computer storage medium. BACKGROUND

[0002] A gas water heater with a zero-cold-water function generally detects the water temperature at the water inlet and outlet of the water heater through built-in inlet and outlet water temperature sensors to determine whether to start or stop the zero-cold-water circulation. Since the user's circulation pipeline has two states of good and poor heat preservation. When the heat preservation is good, the water temperature in the water heater decreases rapidly, the temperature sensor detects low water temperature, and the zero-cold-water circulation is started. The actual water temperature in the circulation pipeline is still high, the start this time causes heat waste, and makes the water flow in the circulation pipeline circulate and speeds up heat dissipation. When the heat preservation is poor, the water temperature in the circulation pipeline decreases rapidly, and the internal temperature sensor of the water heater monitors high water temperature, which does not meet the zero-cold-water circulation start condition. At this time, the user feels that the water temperature in the pipeline is not enough when using hot water, the comfort is reduced, and the "zero-cold-water" experience is discounted. SUMMARY

[0003] The present application solves the technical problem of being unable to identify the heat preservation state of the circulation pipeline in the water heater in advance in the prior art, and provides a zero-cold-water circulation control method and system, a water heater, and a computer storage medium.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] The present application provides a zero-cold-water circulation control method, which comprises:

[0006] In the process of water heater circulation heating, when the circulation heating stop condition is met, the circulation heating is stopped and the heat preservation state is entered;

[0007] In the heat preservation state, it is judged whether the difference between the set temperature and the outlet water temperature of the water heater is greater than a first difference threshold value;

[0008] When the judgment result is yes, the current backwater temperature is recorded as a start point backwater temperature;

[0009] The water heater is controlled to heat and the circulation pump is controlled to operate for a preset time length;

[0010] The temperature average value of the backwater temperature in a preset time period is counted;

[0011] The start condition of the next circulation heating is determined according to the temperature average value and the start point backwater temperature;

[0012] When the start condition of the next circulation heating is met, the next circulation heating is started.

[0013] Preferably, the start condition of the next cycle heating comprises that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold, and the second difference threshold is positively correlated with the absolute value of the difference between the temperature average value and the start point return water temperature.

[0014] Preferably, the start condition of the next cycle heating is determined according to the temperature average value and the start point return water temperature, comprising:

[0015] When the absolute value of the difference is less than a first comparison threshold, the difference between the set temperature and the outlet water temperature greater than the second difference threshold is determined as the start condition of the next cycle heating; wherein the second difference threshold is equal to a third difference threshold, and the third difference threshold is greater than the first difference threshold.

[0016] Preferably, the start condition of the next cycle heating is determined according to the temperature average value and the start point return water temperature, further comprising:

[0017] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is less than zero, the difference between the set temperature and the outlet water temperature greater than the second difference threshold is determined as the start condition of the next cycle heating; wherein the second difference threshold is less than the third difference threshold.

[0018] Preferably, the start condition of the next cycle heating is determined according to the temperature average value and the start point return water temperature, further comprising:

[0019] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is greater than or equal to zero, the difference between the set temperature and the outlet water temperature greater than the second difference threshold is determined as the start condition of the next cycle heating; wherein the second difference threshold is greater than the third difference threshold.

[0020] Preferably, the cycle heating stop condition comprises that the difference between the set temperature and the return water temperature is less than a fourth difference threshold.

[0021] Preferably, in the first cycle heating, when the difference between the set temperature and the outlet water temperature of the water heater is greater than the third difference threshold, the water heater starts cycle heating.

[0022] The application also provides a control system for zero cold water circulation, comprising:

[0023] The heat preservation module is configured to stop cycle heating and enter a heat preservation state when the cycle heating stop condition is met during the cycle heating of the water heater.

[0024] a determining module configured to determine whether a difference between the set temperature and the outlet water temperature is greater than a first difference threshold value in the heat preservation state;

[0025] a start point recording module configured to record the current return water temperature as a start point return water temperature when the determination result is yes;

[0026] a heating module configured to control the water heater to heat and control the circulating pump to operate for a preset time length;

[0027] a statistical module configured to statistically determine a temperature average value of the return water temperature in a preset time period;

[0028] a determining module configured to determine an opening condition of next cycle heating according to the temperature average value and the start point return water temperature;

[0029] a starting module configured to start the next cycle heating when the starting condition of the next cycle heating is met.

[0030] Preferably, the opening condition of the next cycle heating comprises that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold value, and the second difference threshold value is positively correlated with an absolute value of a difference between the temperature average value and the start point return water temperature.

[0031] Preferably, the determining module is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than the second difference threshold value as the opening condition of the next cycle heating when the absolute value of the difference is less than a first comparison threshold value; wherein the second difference threshold value is equal to a third difference threshold value, and the third difference threshold value is greater than the first difference threshold value.

[0032] Preferably, the determining module is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than the second difference threshold value as the opening condition of the next cycle heating when the absolute value of the difference is greater than or equal to the first comparison threshold value and the difference is less than zero; wherein the second difference threshold value is less than the third difference threshold value.

[0033] Preferably, the determining module is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than the second difference threshold value as the opening condition of the next cycle heating when the absolute value of the difference is greater than or equal to the first comparison threshold value and the difference is greater than or equal to zero; wherein the second difference threshold value is greater than the third difference threshold value.

[0034] Preferably, the cycle heating stopping condition comprises that the difference between the set temperature and the return water temperature is less than a fourth difference threshold value.

[0035] Preferably, the starting module is further configured to start the cycle heating of the water heater when a difference between the set temperature and the outlet water temperature of the water heater is greater than the third difference threshold.

[0036] The application further provides a water heater comprising a memory, a processor and a control program of the water heater stored in the memory and configured to be run on the processor, wherein the control program of the water heater, when executed by the processor, implements the zero-cold-water-cycle control method as described above.

[0037] The application further provides a computer storage medium having a control program of the water heater stored thereon, wherein the control program of the water heater, when executed by a processor, implements the zero-cold-water-cycle control method as described above.

[0038] The application has the following positive progress effects: the starting condition of the zero-cold-water-cycle of the gas water heater is determined according to the outlet water temperature, the set temperature, the temperature average value and the starting point backwater temperature, so as to identify the heat preservation state of the cycle pipeline of the user's home in advance, reduce the influence of the heat preservation performance of the zero-cold-water-cycle branch on the water temperature, provide a more suitable water temperature for the user, achieve the goal of energy saving and consumption reduction, and improve the user's experience of using the gas water heater. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The flowchart of the zero-cold-water-cycle control method of the embodiment 1 of the application.

[0040] Figure 2 The flowchart of an example of the zero-cold-water-cycle control method of the embodiment 1 of the application.

[0041] Figure 3 The module schematic diagram of the zero-cold-water-cycle control system of the embodiment 2 of the application.

[0042] Figure 4 The structural schematic diagram of the water heater of the embodiment 3 of the application. DETAILED DESCRIPTION

[0043] The application will be further described below by way of examples, but the application is not limited in the scope of the examples.

[0044] Embodiment 1

[0045] The application provides a zero-cold-water-cycle control method, referring to Figure 1 , the control method comprises:

[0046] S11, during the cycle heating of the water heater, when the cycle heating stop condition is met, the cycle heating is stopped and the heat preservation state is entered.

[0047] S12, judging whether the difference between the set temperature and the outlet water temperature of the water heater is greater than a first difference threshold in a heat preservation state.

[0048] S13, recording the current backwater temperature as a start point backwater temperature when the judgment result is yes.

[0049] S14, controlling the water heater to heat and controlling the circulating pump to operate for a preset time length.

[0050] S15, calculating a temperature average of the backwater temperature in a preset time period.

[0051] S16, determining an opening condition of starting next cycle heating according to the temperature average and the start point backwater temperature.

[0052] S17, starting the next cycle heating when the start condition of the next cycle heating is met.

[0053] In the water heater, there is a circulating pipeline, and the heat preservation effect of the circulating pipeline has two states of good heat preservation effect and poor heat preservation effect. If the heat preservation effect is good, the water temperature in the water heater decreases quickly, the water temperature detected by the temperature sensor is low, and actually the water temperature in the circulating pipeline is relatively high. Opening will cause waste of heat energy and make the water in the circulating pipeline circulate and flow to accelerate heat dissipation. If the heat preservation effect is poor, the water temperature in the circulating pipeline decreases quickly, and the water temperature detected by the temperature sensor of the water heater is relatively high. If the cycle heating is not opened, the user's comfort is reduced, and the zero cold water experience is compromised. The set temperature is set by the user according to the actual situation, and the backwater temperature is the temperature detected by the backwater temperature sensor of the water heater.

[0054] The opening condition of starting the next cycle heating is determined according to the difference between the temperature average and the start point backwater temperature. The smaller the difference between the temperature average and the start point backwater temperature, the poorer the heat preservation effect in the circulating pipeline, the greater the heat loss, and the longer the heating time. The greater the difference between the temperature average and the start point backwater temperature, the better the heat preservation effect in the circulating pipeline. The opening condition of the next cycle heating is determined according to the judgment of the heat preservation effect in the circulating pipeline.

[0055] In this embodiment, the opening condition of the zero cold water cycle of the gas water heater is determined according to the outlet water temperature, the set temperature, the temperature average and the start point backwater temperature, so as to identify the heat preservation state of the circulating pipeline in the user's home in advance, reduce the influence of the heat preservation performance of the zero cold water cycle branch on the water temperature, provide more suitable water temperature for the user, achieve the goal of energy saving and consumption reduction, and improve the user's experience of using the gas water heater.

[0056] In specific implementation, the opening condition of the next cycle heating includes that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold, and the second difference threshold is positively correlated with the absolute value of the difference between the temperature average and the start point backwater temperature.

[0057] When the difference between the set temperature and the outlet water temperature is greater than the second difference threshold, the water temperature in the water heater and the circulation pipeline decreases, the temperature sensor of the water heater detects the decrease in temperature, the next cycle heating opening condition is reached (easier to open), and the same heating effect is used to heat the water temperature in the circulation pipeline to the set temperature in a shorter time, that is, the worse the heat preservation effect in the circulation pipeline, the lower the water temperature in the circulation pipeline, the smaller the difference between the temperature average value and the starting point return water temperature, the easier the next cycle should be opened, and the shorter the interval of the next cycle opening, so that the water temperature in the circulation pipeline is not too low, the water temperature is comfortable, and the energy saving and consumption reduction goal is achieved.

[0058] In specific implementation, step S16 includes:

[0059] When the absolute value of the difference is less than the first comparison threshold, the difference between the set temperature and the outlet water temperature being greater than the second difference threshold is determined as the opening condition of the next cycle heating. The second difference threshold is equal to the third difference threshold, and the third difference threshold is greater than the first difference threshold.

[0060] When the absolute value of the difference is less than the first comparison threshold, the opening condition of the next cycle heating is the same as the opening condition of the current cycle heating.

[0061] At this time, it is indicated that the heat preservation effect in the circulation pipeline is within the standard heat preservation effect range, the heating time of the current cycle is within the standard heating time range, the second difference threshold of the next cycle heating, that is, the temperature difference, is unchanged, and the next cycle heating is started when the temperature difference is the standard temperature difference, that is, the opening condition of the current cycle can be used as the opening condition of the next cycle.

[0062] In specific implementation, step S16 further includes:

[0063] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is less than zero, the difference between the set temperature and the outlet water temperature being greater than the second difference threshold is determined as the opening condition of the next cycle heating. The second difference threshold is less than the third difference threshold.

[0064] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is less than zero, it is indicated that the heat preservation effect in the circulation pipeline is poor, and the heating time is long, so that the return water temperature can reach the set temperature. The second difference threshold of the next cycle heating, that is, the temperature difference, is reduced, and the next cycle heating is started when the temperature difference is small, so as to avoid the decrease in water temperature due to heat dissipation of the circulation pipeline and improve user experience.

[0065] In specific implementation, step S16 further includes:

[0066] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is greater than or equal to zero, the difference between the set temperature and the outlet water temperature is greater than the second difference threshold, which is determined as the opening condition of the next cycle heating. The second difference threshold is greater than the third difference threshold.

[0067] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is greater than or equal to zero, it means that the heat preservation effect in the circulation pipeline is good, the heating time is short, and the return water temperature reaches the set temperature. The second difference threshold of the next cycle heating is increased, and the next cycle heating is started when the temperature difference is large, thereby saving energy consumption.

[0068] In specific implementation, the cycle heating stop condition includes that the difference between the set temperature and the return water temperature is less than a fourth difference threshold.

[0069] The water heater enters a heat preservation state, which reduces heat energy consumption while ensuring a suitable temperature.

[0070] The fourth difference threshold is set according to actual conditions.

[0071] In specific implementation, in the first cycle heating, when the difference between the set temperature and the outlet water temperature of the water heater is greater than the third difference threshold, the water heater starts cycle heating.

[0072] The third difference threshold is set according to actual conditions.

[0073] The following specific example is used to further illustrate the control method of the zero-cold-water circulation. Referring to FIG. 1, the method includes the following steps. Figure 2

[0074] When the opening condition of the current cycle heating is met, the current cycle heating is started;

[0075] When the difference between the set temperature and the outlet water temperature is greater than or equal to the third difference threshold a, the water heater starts cycle heating, and the timer starts timing;

[0076] The inlet water temperature sensor (i.e., the return water temperature sensor) collects the return water temperature every 1 second during the cycle heating;

[0077] It is judged whether the difference between the set temperature and the return water temperature is less than the fourth difference threshold c;

[0078] When the judgment result is yes, the current cycle heating is ended, and the heat preservation state is entered;

[0079] When the difference between the set temperature and the return water temperature is greater than the first difference threshold (a-2), the return water temperature t is recorded, the water heater is heated, and the circulating water pump is operated for a preset time length 10s. The difference between the third difference threshold and the first difference threshold can be a number other than 2.

[0080] ​The inlet water temperature sensor collects the return water temperature every 1s to calculate the temperature average value Δt;

[0081] When the absolute value of the difference is less than the first comparison threshold 1 (i.e., |Δt-t|<1), the difference between the set temperature and the return water temperature greater than the second difference threshold b is determined as the start condition of the next cycle heating; wherein the second difference threshold b is equal to the third difference threshold a.

[0082] When the absolute value of the difference is greater than or equal to the first comparison threshold 1 and the difference is less than zero (i.e., Δt-t<-1), the difference between the set temperature and the return water temperature greater than the second difference threshold b is determined as the start condition of the next cycle heating; wherein the second difference threshold b is less than the third difference threshold a.

[0083] When the absolute value of the difference is greater than or equal to the first comparison threshold 1 and the difference is greater than or equal to zero (i.e., Δt-t>1), the difference between the set temperature and the return water temperature greater than the second difference threshold b is determined as the start condition of the next cycle heating; wherein the second difference threshold b is greater than the third difference threshold a.

[0084] When the start condition of the next cycle heating is met, the next cycle heating is started.

[0085] The first comparison threshold 1 is a specific value provided by the embodiment of the present application, and other values obtained through theoretical calculation or experimental test also fall within the protection scope of the present application.

[0086] Embodiment 2

[0087] The present application also provides a control system for the zero-cold-water circulation, referring to Figure 3 The control system comprises:

[0088] The heat preservation module 1 is used to stop the cycle heating and enter the heat preservation state when the cycle heating stop condition is met during the cycle heating of the water heater.

[0089] The judgment module 2 is used to judge whether the difference between the set temperature and the outlet water temperature of the water heater is greater than the first difference threshold in the heat preservation state.

[0090] The start point recording module 3 is used to record the current return water temperature as the start point return water temperature when the judgment result is yes.

[0091] The heating module 4 is used to control the water heater to heat and control the circulation pump to run for a preset time length.

[0092] The statistical module 5 is used to count the temperature average value of the return water temperature in a preset time period.

[0093] The determination module 6 is used to determine the start condition of the next cycle heating according to the temperature average value and the start point return water temperature.

[0094] The starting module 7 is configured to start the next cycle heating when a starting condition of the next cycle heating is met.

[0095] The water temperature in the water heater is reduced quickly when the heat preservation effect of the circulation pipeline is good, and the water temperature detected by the temperature sensor is low, while the water temperature in the circulation pipeline is relatively high, and the opening will cause waste of heat energy and accelerate the circulation of the water in the circulation pipeline to speed up heat dissipation. When the heat preservation effect of the circulation pipeline is poor, the water temperature in the circulation pipeline is reduced quickly, and the water temperature detected by the temperature sensor of the water heater is relatively high, and the next cycle heating is not started, which reduces the comfort of the user and reduces the experience of zero cold water. The set temperature is set by the user according to the actual situation, and the backwater temperature is the temperature detected by the backwater temperature sensor of the water heater.

[0096] The starting condition of the next cycle heating is determined according to the difference between the temperature average value and the backwater temperature at the starting point, and the smaller the difference between the temperature average value and the backwater temperature at the starting point, the poorer the heat preservation effect of the circulation pipeline, the greater the heat loss, and the longer the heating time. The larger the difference between the temperature average value and the backwater temperature at the starting point, the better the heat preservation effect of the circulation pipeline, and the starting condition of the next cycle heating is determined according to the heat preservation effect of the circulation pipeline.

[0097] The embodiment determines the starting condition of the zero cold water circulation of the gas water heater according to the outlet water temperature, the set temperature, the temperature average value and the backwater temperature at the starting point, so as to identify the heat preservation state of the circulation pipeline at the user's home in advance, reduce the influence of the heat preservation performance of the zero cold water circulation branch on the water temperature, provide more suitable water temperature for the user, achieve the goal of energy saving and consumption reduction, and improve the user's experience of using the gas water heater.

[0098] In specific implementation, the starting condition of the next cycle heating includes that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold, and the second difference threshold is positively correlated with the absolute value of the difference between the temperature average value and the backwater temperature at the starting point.

[0099] When the difference between the set temperature and the outlet water temperature is greater than the second difference threshold, the water temperature in the water heater and the circulation pipeline is reduced, the temperature sensor of the water heater detects the temperature reduction, the starting condition of the next cycle heating is met (more easily started), and the same heating effect is used to heat the water temperature in the circulation pipeline to the set temperature in a shorter time. That is, the poorer the heat preservation effect of the circulation pipeline, the lower the water temperature in the circulation pipeline, the smaller the difference between the temperature average value and the backwater temperature at the starting point, and the next cycle heating should be started more easily, and the interval length of the next cycle heating is shorter, so that the water temperature in the circulation pipeline is not too low, the comfortable water temperature is achieved, and the goal of energy saving and consumption reduction is achieved.

[0100] In specific implementation, the determining module 6 is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold as the start condition of the next cycle heating when the absolute value of the difference is less than the first comparison threshold. The second difference threshold is equal to a third difference threshold, and the third difference threshold is greater than the first difference threshold.

[0101] When the absolute value of the difference is less than the first comparison threshold, the start condition of the next cycle heating is the same as the start condition of the current cycle heating.

[0102] At this time, it is indicated that the heat preservation effect in the circulation pipeline is within the standard heat preservation effect range, the length of the current cycle heating is within the standard heating length range, the second difference threshold of the next cycle heating, i.e., the temperature difference, is unchanged, and the next cycle heating is started when the temperature difference is the standard temperature difference, i.e., the start condition of the current cycle can be used as the start condition of the next cycle.

[0103] In specific implementation, the determining module 6 is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold as the start condition of the next cycle heating when the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is less than zero. The second difference threshold is less than a third difference threshold.

[0104] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is less than zero, it is indicated that the heat preservation effect in the circulation pipeline is poor, and the length of the heating is long, so that the return water temperature can reach the set temperature. The second difference threshold of the next cycle heating, i.e., the temperature difference, is reduced, and the next cycle heating is started when the temperature difference is small, thereby avoiding the decrease of the water temperature due to the heat dissipation of the circulation pipeline and improving the user experience.

[0105] In specific implementation, the determining module 6 is specifically configured to determine that the difference between the set temperature and the outlet water temperature is greater than a second difference threshold as the start condition of the next cycle heating when the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is greater than or equal to zero. The second difference threshold is greater than a third difference threshold.

[0106] When the absolute value of the difference is greater than or equal to the first comparison threshold and the difference is greater than or equal to zero, it is indicated that the heat preservation effect in the circulation pipeline is good, and the length of the heating is short, so that the return water temperature can reach the set temperature. The second difference threshold of the next cycle heating, i.e., the temperature difference, is increased, and the next cycle heating is started when the temperature difference is large, thereby saving energy consumption.

[0107] In specific implementation, the cycle heating stop condition includes that the difference between the set temperature and the return water temperature is less than a fourth difference threshold.

[0108] The water heater enters the heat preservation state, thereby reducing the heat energy consumption while ensuring the appropriate temperature.

[0109] The fourth difference threshold is set according to actual conditions.

[0110] In the specific implementation, when the difference between the set temperature and the outlet water temperature of the water heater is greater than a third difference threshold in the first cycle heating, the water heater starts the cycle heating.

[0111] The third difference threshold is set according to actual conditions.

[0112] The control method of the zero-cold-water cycle is further described below with a specific example, referring to Figure 2 The method includes the following steps:

[0113] When the opening condition of the current cycle heating is met, the current cycle heating is started;

[0114] When the difference between the set temperature and the outlet water temperature is greater than or equal to a third difference threshold a, the water heater starts the cycle heating, and the timer starts timing;

[0115] The inlet water temperature sensor (i.e., the return water temperature sensor) collects the return water temperature every 1 second during the cycle heating;

[0116] It is determined whether the difference between the set temperature and the return water temperature is less than a fourth difference threshold c;

[0117] When the determination result is yes, the current cycle heating ends, and the heat preservation state is entered;

[0118] When the difference between the set temperature and the return water temperature is greater than a first difference threshold (a-2), the return water temperature t is recorded, the water heater performs heating and the circulating water pump operates for a preset time length 10s; the difference between the third difference threshold and the first difference threshold can be a number other than 2;

[0119] The inlet water temperature sensor collects the return water temperature every 1s to calculate the temperature average value Δt;

[0120] When the absolute value of the difference is less than a first comparison threshold 1 (i.e., |Δt-t|<1), the difference between the set temperature and the return water temperature being greater than a second difference threshold b is determined as the opening condition of the next cycle heating; wherein the second difference threshold b is equal to the third difference threshold a;

[0121] When the absolute value of the difference is greater than or equal to the first comparison threshold 1 and the difference is less than zero (i.e., Δt-t<-1), the difference between the set temperature and the return water temperature being greater than the second difference threshold b is determined as the opening condition of the next cycle heating; wherein the second difference threshold b is less than the third difference threshold a;

[0122] When the absolute value of the difference is greater than or equal to the first comparison threshold 1 and the difference is greater than or equal to zero (i.e., Δt-t>1), the difference between the set temperature and the return water temperature greater than a second difference threshold b is determined as the start condition of the next cycle heating; wherein the second difference threshold b is greater than the third difference threshold a.

[0123] When the start condition of the next cycle heating is met, the next cycle heating is started.

[0124] The first comparison threshold 1 is a specific value provided by the embodiment of the present application, and other values obtained from theoretical calculation or experimental test are also within the protection scope of the present application.

[0125] Embodiment 3

[0126] Figure 4 A structure schematic diagram of a water heater is provided for the embodiment 3 of the present application. The water heater comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the zero cold water circulation control method in the embodiment 1 when executing the program. Figure 4 The displayed water heater 30 is only an example, and should not bring any limitation to the function and use range of the embodiment of the present application.

[0127] The water heater 30 can be in the form of a general computing device, for example, it can be a server device. The components of the water heater 30 can include but are not limited to: the above-mentioned at least one processor 31, the above-mentioned at least one memory 32, a bus 33 connecting different system components including the memory 32 and the processor 31.

[0128] The bus 33 includes a data bus, an address bus and a control bus.

[0129] The memory 32 can include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322, and can further include a read-only memory (ROM) 323.

[0130] The memory 32 can further include a program / utility 325 having a set of program modules 324, such as an operating system, one or more application programs, other program modules, and program data, and can include an implementation of a network environment, each or a combination of the examples.

[0131] The processor 31 performs various function applications and data processing by running the computer program stored in the memory 32, such as the zero cold water circulation control method in the embodiment 1 of the present application.

[0132] The water heater 30 can also communicate with one or more external devices 34 (e.g., a keypad, a display, a microphone, a speaker, etc.). Such communication can occur through input / output (I / O) interface 35. Also, the model generated water heater 30 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or the public network, such as the Internet) through network adapter 36. As illustrated, network adapter 36 communicates with the other modules of the model generated water heater 30 through bus 33. It should be appreciated that other hardware and / or software modules can be used in conjunction with the model generated water heater 30, including but not limited to, microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data archival storage systems, etc.

[0133] It should be noted that although several units / modules or sub-units / modules of the water heater are mentioned in the foregoing detailed description, such a division is merely exemplary and not mandatory. Indeed, according to embodiments of the application, the features and functions of two or more units / modules described above can be embodied in one unit / module; conversely, the features and functions of one unit / module described above can be further divided into embodied by a plurality of units / modules.

[0134] Embodiment 4

[0135] The embodiment provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the zero-cold water circulation control method in embodiment 1.

[0136] More specifically, the readable storage medium can include, but is not limited to, a portable disc, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0137] In possible embodiments, the application can also be implemented in the form of a program product, which includes program codes for causing a terminal device to execute the zero-cold water circulation control method in embodiment 1 when the program product is run on the terminal device.

[0138] More specifically, the program codes for executing the application can be written in any combination of one or more programming languages, and can be executed completely on a user device, partially on a user device, as a stand-alone software package, partially on a user device and partially on a remote device, or completely on a remote device.

[0139] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A control method of zero cold water circulation, characterized by, The control method comprises: In the process of the water heater circulating heating, when a circulating heating stop condition is met, the circulating heating is stopped and a heat preservation state is entered; In the heat preservation state, it is judged whether a difference between a set temperature of the water heater and a water outlet temperature is greater than a first difference threshold value; When the judgment result is yes, a current backwater temperature is recorded as a starting point backwater temperature; The water heater is controlled to heat and a circulating pump is controlled to operate for a preset time length; A temperature average value of the backwater temperature in a preset time period is counted; An opening condition of next time circulating heating is determined according to the temperature average value and the starting point backwater temperature; When the starting condition of the next time circulating heating is met, the next time circulating heating is started; The opening condition of the next time circulating heating comprises that a difference between the set temperature and the water outlet temperature is greater than a second difference threshold value, and the second difference threshold value is positively correlated with an absolute value of a difference between the temperature average value and the starting point backwater temperature.

2. The control method of zero-cold water circulation according to claim 1, characterized by, The determination of the opening condition of the next time circulating heating according to the temperature average value and the starting point backwater temperature comprises: When the absolute value of the difference is less than a first comparison threshold value, the difference between the set temperature and the water outlet temperature being greater than the second difference threshold value is determined as the opening condition of the next time circulating heating; wherein the second difference threshold value is equal to a third difference threshold value, and the third difference threshold value is greater than the first difference threshold value.

3. The control method of zero-cold water circulation according to claim 2, wherein The determination of the opening condition of the next time circulating heating according to the temperature average value and the starting point backwater temperature further comprises: When the absolute value of the difference is greater than or equal to the first comparison threshold value and the difference is less than zero, the difference between the set temperature and the water outlet temperature being greater than the second difference threshold value is determined as the opening condition of the next time circulating heating; wherein the second difference threshold value is less than the third difference threshold value.

4. The control method of the zero-cold water circulation according to claim 3, characterized by, The determination of the opening condition of the next time circulating heating according to the temperature average value and the starting point backwater temperature further comprises: When the absolute value of the difference is greater than or equal to the first comparison threshold value and the difference is greater than or equal to zero, the difference between the set temperature and the water outlet temperature being greater than the second difference threshold value is determined as the opening condition of the next time circulating heating; wherein the second difference threshold value is greater than the third difference threshold value.

5. The control method of zero-cold water circulation according to claim 1, wherein, The circulating heating stop condition comprises that a difference between the set temperature and the backwater temperature is less than a fourth difference threshold value.

6. The control method of zero-cold water circulation according to claim 2, wherein In the first time circulating heating, when the difference between the set temperature of the water heater and the water outlet temperature is greater than the third difference threshold value, the water heater starts the circulating heating.

7. A control system for zero cold water circulation, characterized by, The control system comprises: A heat preservation module, configured to, in the process of the water heater circulating heating, stop the circulating heating and enter a heat preservation state when a circulating heating stop condition is met; A judgment module, configured to, in the heat preservation state, judge whether a difference between a set temperature of the water heater and a water outlet temperature is greater than a first difference threshold value; A starting point recording module, configured to, when the judgment result is yes, record a current backwater temperature as a starting point backwater temperature; A heating module, configured to control the water heater to heat and control a circulating pump to operate for a preset time length; A counting module, configured to count a temperature average value of the backwater temperature in a preset time period; determining a start condition of next cycle heating according to the temperature average value and the start point return water temperature; starting next cycle heating when the start condition of next cycle heating is met; the start condition of next cycle heating comprises that a difference between the set temperature and the outlet water temperature is greater than a second difference threshold, and the second difference threshold is positively correlated with an absolute value of a difference between the temperature average value and the start point return water temperature.

8. A water heater, characterized by The water heater comprises a memory, a processor, and a control program of the water heater stored on the memory and used for running on the processor, and the control program of the water heater, when executed by the processor, implements the zero-cold-water cycle control method in any one of claims 1-6.

9. A computer storage medium, characterized in that The computer storage medium stores the control program of the water heater, and the control program of the water heater, when executed by the processor, implements the zero-cold-water cycle control method in any one of claims 1-6.

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