Operation control method and operation control device of heat pump water heater and heat pump water heater

Abstract

The invention discloses an operation control method and device of a heat pump water heater, the heat pump water heater and a computer readable storage medium. The first operation duration of an electric heater in a certain preset time period is obtained; the water temperature of the water tank seriously deviates from the set temperature of the water tank due to the fact that the water demand of the user in the preset time period is large, and heat storage of the water tank can be improved in the corresponding preset time period in the next preset period; if the electric heater is not started, it shows that the water demand of the user in the preset period is not large, heat storage of the water tank can meet the water demand of the user, and even heat surplus exists, so that heat storage of the water tank can be reduced in the corresponding preset period in the next preset period; according to the operation control method, the operation state of the heat pump system is adjusted according to the operation duration of the electric heater, the water temperature of the water tank of the heat pump water heater can better meet the water use requirement of a user, the heating frequency of the water tank is reduced, and the energy efficiency of the heat pump water heater is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water heater control, and in particular to an operation control method and an operation control device of a heat pump water heater, a heat pump water heater and a computer-readable storage medium. Background Art

[0002] At present, the water tank temperature control method of ordinary water heaters is to use the water tank temperature sensor to detect the water temperature of the water tank. When the water temperature of the water tank is lower than a certain temperature below the water tank set temperature, the heating function is started, and when the water temperature of the water tank reaches the water tank set temperature, the heating is stopped. For example: the water tank set temperature is 55℃, when the water tank temperature is lower than 46℃, the unit starts heating, and when the water tank temperature reaches 55℃, the unit stops. Under normal circumstances, this will cause the water temperature of the water tank to fluctuate between the unit's startup temperature of 46℃ and the water tank set temperature of 55℃; in special circumstances, such as when the user's water demand is large during a certain period of time, the water temperature of the water tank will seriously deviate from the water tank set temperature. At this time, the electric heater will be enabled for auxiliary heating. Although the activation of the electric heater has a faster heating effect, the energy efficiency is low.

[0003] The current temperature control method of water heaters is to control heating only according to the water tank temperature, which will lead to the following situations: first, the water temperature in the water tank is heated to a higher temperature when there is no water demand, resulting in overheating; second, when there is a large water demand, the water tank will not store enough heat, and the electric heater needs to be turned on frequently to supplement heat in a short time. Therefore, heating control based only on the water tank temperature will lead to frequent heating of the water heater and poor energy efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide an operation control method, an operation control device, a heat pump water heater and a computer-readable storage medium for a heat pump water heater, which can effectively improve the energy efficiency of the heat pump water heater.

[0005] In a first aspect, an embodiment of the present invention provides an operation control method of a heat pump water heater, wherein the heat pump water heater comprises a heat pump system, a water tank for exchanging heat with the heat pump system, and an electric heater arranged in the water tank, the method comprising:

[0006] Obtaining a first operating time of the electric heater in a preset period of time within a preset cycle;

[0007] According to the first operating time, the operating state of the heat pump system in a corresponding preset time period within a next preset cycle is adjusted to reduce the heating frequency of the water tank.

[0008] The operation control method of the heat pump water heater provided according to the embodiment of the present invention has at least the following beneficial effects: by obtaining the operation parameters of the heat pump water heater in the previous preset cycle, the operation state of the heat pump water heater in the next preset cycle is adjusted, so that the water temperature of the water tank of the heat pump water heater is more in line with the user's water demand. Specifically, the first operation time of the electric heater in a preset time period is obtained. If the electric heater is turned on, it means that the user's water demand in the preset time period is large, causing the water temperature of the water tank to seriously deviate from the set temperature of the water tank, so that the heat storage of the water tank can be increased in the corresponding preset time period of the next preset cycle; if the electric heater is not turned on, it means that the user's water demand in the preset time period is not large, and the heat storage of the water tank can meet the user's water demand, and there is even a surplus of heat, so that the heat storage of the water tank can be reduced in the corresponding preset time period of the next preset cycle; the operation control method can make the water temperature of the water tank of the heat pump water heater more in line with the user's water demand by adjusting the operation state of the heat pump system according to the operation time of the electric heater, reduce the heating frequency of the water tank, and effectively improve the energy efficiency of the heat pump water heater.

[0009] According to the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is not zero, adjusting the operation state of the heat pump system corresponding to the preset time period in the next preset cycle includes:

[0010] The heat pump system is started in advance during a corresponding preset period of time in the next preset cycle.

[0011] According to the operation control method of the heat pump water heater provided by some embodiments of the present invention, the heat pump system is turned on for a first time period in advance, and the first time period is calculated based on the heating power of the electric heater, the first operating time and the heating power of the heat pump system.

[0012] According to the operation control method of the heat pump water heater provided by some embodiments of the present invention, the heat output by the electric heater to the water tank during the first operation time is equal to the heat output by the heat pump system to the water tank during the first time.

[0013] According to the operation control method of the heat pump water heater provided in some embodiments of the present invention, after converting the first time length, the method further includes:

[0014] Obtaining a second operating time of the heat pump system in the preset time period;

[0015] When the sum of the second operating time and the first time is greater than the total time of the preset period, the target set temperature of the water tank is increased within the corresponding preset period.

[0016] According to the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is not zero, adjusting the operation state of the heat pump system corresponding to the preset time period in the next preset cycle includes:

[0017] The predicted advance time is obtained by converting the heating power of the electric heater, the first operating time and the heating power of the heat pump system;

[0018] Obtaining a second operating time of the heat pump system in the preset time period;

[0019] When the sum of the second operating time and the predicted advance time is less than or equal to the total time of a preset time period, the heat pump system is turned on in advance by the predicted advance time period; when the sum of the second operating time and the predicted advance time is greater than the total time of a preset time period, the heat pump system is controlled to be continuously turned on and the target set temperature of the water tank is increased within the corresponding preset time period.

[0020] According to the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is zero, adjusting the operation state of the heat pump system corresponding to the preset time period in the next preset cycle includes:

[0021] During a corresponding preset period of time in the next preset cycle, the target set temperature of the water tank is lowered.

[0022] According to the operation control method of the heat pump water heater provided by some embodiments of the present invention, when the first operation time is zero and the target set temperature of the water tank cannot be reduced, adjusting the operation state of the heat pump system corresponding to the preset time period in the next preset cycle includes:

[0023] The heat pump system is started up with a delay during a corresponding preset period in the next preset cycle.

[0024] According to the operation control method of the heat pump water heater provided in some embodiments of the present invention, the preset cycle is one week, and the preset time period is one day.

[0025] In a second aspect, an embodiment of the present invention provides an operation control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the operation control method as described in the embodiment of the first aspect above.

[0026] In a third aspect, an embodiment of the present invention provides a heat pump water heater, comprising an operation control device as described in the embodiment of the second aspect above.

[0027] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the operation control method described in the embodiment of the first aspect above.

[0028] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0031] Figure 1 is a schematic diagram of a water tank of a heat pump water heater provided in an embodiment of the present invention;

[0032] Figure 2 is a flow chart of an operation control method of a heat pump water heater provided by an embodiment of the present invention;

[0033] Figure 3 is a flow chart of an operation control method of a heat pump water heater provided by another embodiment of the present invention;

[0034] Figure 4 The present invention Figure 2 In the embodiment of the present invention, when the first running time is not zero, a flowchart of the method steps included in step S220;

[0035] Figure 5 This is a schematic diagram of the change of water temperature in the water tank over time obtained by using the EN 16147 standard test method under the existing standard temperature control mode of the heat pump water heater;

[0036] Figure 6 is a flow chart of an operation control method of a heat pump water heater provided in a fourth embodiment of the present invention;

[0037] Figure 7 It is a structural schematic diagram of the operation control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0039] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0041] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The water tank temperature control method of ordinary water heaters is to use the water tank temperature sensor to detect the water temperature of the water tank. When the water temperature of the water tank is lower than a certain temperature below the water tank set temperature, the heating function is started, and when the water temperature of the water tank reaches the water tank set temperature, the heating is stopped. For example: the water tank set temperature is 55℃, when the water tank temperature is lower than 46℃, the unit starts heating, and when the water tank temperature reaches 55℃, the unit stops. Under normal circumstances, this will cause the water temperature of the water tank to fluctuate between the unit's startup temperature of 46℃ and the water tank set temperature of 55℃; in special circumstances, such as when the user's water demand is large during a certain period of time, the water temperature of the water tank will seriously deviate from the water tank set temperature. At this time, the electric heater will be enabled for auxiliary heating. Although the activation of the electric heater has a faster heating effect, the energy efficiency is low.

[0043] The current temperature control method of water heaters is to control heating only according to the water tank temperature, which will lead to the following situations: first, the water temperature in the water tank is heated to a higher temperature when there is no water demand, resulting in overheating; second, when there is a large water demand, the water tank will not store enough heat, and the electric heater needs to be turned on frequently to supplement heat in a short time. Therefore, heating control based only on the water tank temperature will lead to frequent heating of the water heater and poor energy efficiency.

[0044] Based on this, an embodiment of the present invention provides an operation control method, an operation control device, a heat pump water heater and a computer-readable storage medium of a heat pump water heater, which adjusts the operation state of the heat pump water heater in the next preset cycle by thermally acquiring the operation parameters of the previous preset cycle of the heat pump water heater, so that the water temperature of the water tank of the heat pump water heater is more in line with the user's water demand. Specifically, the first operation time of the electric heater in a preset time period is acquired. If the electric heater is turned on, it means that the user's water demand in the preset time period is large, causing the water temperature of the water tank to seriously deviate from the set temperature of the water tank, so that the heat storage of the water tank can be increased in the corresponding preset time period of the next preset cycle; if the electric heater is not turned on, it means that the user's water demand in the preset time period is not large, and the heat storage of the water tank can meet the user's water demand, and there is even a surplus of heat, so that the heat storage of the water tank can be reduced in the corresponding preset time period of the next preset cycle; the operation control method can make the water temperature of the water tank of the heat pump water heater more in line with the user's water demand, reduce the heating frequency of the water tank, and effectively improve the energy efficiency of the heat pump water heater by adjusting the operation state of the heat pump system according to the operation time of the electric heater.

[0045] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0046] Some embodiments of the present invention provide a heat pump water heater including a heat pump system, a water tank for heat exchange with the heat pump system, and an electric heater disposed in the water tank. Figure 1 , Figure 1 The schematic diagram of the water tank of the heat pump water heater is shown in FIG. 100. The water tank 100 is provided with a water tank inner tank 110 for storing hot water, a cold water inlet 120 and a hot water outlet 130 connected to the water tank inner tank 110. An electric heater 200 is also provided inside the water tank inner tank 110. The electric heater 200 is used to quickly supplement heat when the heat pump system is insufficiently supplied. The heat pump system includes a condenser 300 provided in the water tank inner tank 110. The condenser 300 is used to transfer the heat of the heat pump system to the water in the water tank inner tank 110 to heat the water in the water tank inner tank 110. In addition, a temperature sensor 140 for measuring the water temperature of the water tank is also provided inside the water tank inner tank 110.

[0047] Reference Figure 2 The first aspect of the present invention provides an operation control method of a heat pump water heater, including but not limited to steps S210 to S220:

[0048] Step S210: obtaining a first operating time of the electric heater in a preset period within a preset cycle.

[0049] Step S220: adjusting the operating state of the heat pump system in a corresponding preset period in the next preset cycle according to the first operating time to reduce the heating frequency of the water tank;

[0050] In some embodiments, the preset cycle can be set to one week, and a preset period within the preset cycle can be one of the days of the week, such as Tuesday, that is, one week is a cycle, the start and stop time points of the electric heater are recorded, the daily operation time of the electric heater is calculated, and then the operation state of the heat pump system next Tuesday is adjusted according to the operation time of the electric heater last Tuesday. Since the operation time of the electric heater last Tuesday is actually the result of the heating control rules of the heat pump water heater combined with the actual water demand of the user, therefore, adjusting the operation state of the heat pump system next Tuesday according to the operation time of the electric heater last Tuesday can make the operation state of the heat pump system next Tuesday more in line with the actual water demand of the user.

[0051] The electric heater is configured to start when the water temperature of the water tank is lower than a first preset temperature and stop when the water temperature of the water tank reaches a target set temperature; the first preset temperature is lower than the target set temperature. In addition, the heat pump system is configured to start when the water temperature of the water tank is lower than a second preset temperature and stop when the water temperature of the water tank reaches a target set temperature; the second preset temperature is lower than the target set temperature and higher than the first preset temperature. In some embodiments, the target setting temperature is set to 55°C, the second preset temperature is set to 46°C, and the first preset temperature is set to 36°C. When the water temperature in the water tank reaches 55°C, neither the heat pump system nor the electric heater will work, and the water tank is in a heat preservation state. If the user has no water demand, the water temperature in the water tank will slowly decrease. If the user has water demand and consumes the hot water inside the water tank, cold water will be replenished from the cold water inlet into the water tank, and the water temperature in the water tank will drop to a certain extent. When the water temperature in the water tank drops below 46°C, it means that the water temperature in the water tank is too low. At this time, the heat pump system needs to be turned on. The high-temperature refrigerant of the heat pump system releases heat to the water in the water tank through the condenser in the water tank liner, heats the water, and gradually increases the water temperature in the water tank. In addition, when the user's water consumption is large in a short period of time, the amount of hot water consumed by the user is greater than the amount of hot water generated by the heat pump system. Therefore, even if the heat pump system is in operation, it cannot maintain the water temperature in the water tank at a higher temperature. At this time, the water temperature in the water tank will drop rapidly. When it drops below 36°C, the electric heater will be turned on for auxiliary heating, thereby replenishing the heat in the water tank in a short time.

[0052] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, the operation parameters of the previous preset cycle of the heat pump water heater are obtained to adjust the operation state of the next preset cycle of the heat pump water heater, so that the water temperature of the water tank of the heat pump water heater is more in line with the user's water demand. Specifically, the first operation time of the electric heater in a preset time period is obtained. If the electric heater is turned on, it means that the user's water demand in the preset time period is large, causing the water temperature of the water tank to seriously deviate from the set temperature of the water tank, so that the heat storage of the water tank can be increased in the corresponding preset time period of the next preset cycle; if the electric heater is not turned on, it means that the user's water demand in the preset time period is not large, and the heat storage of the water tank can meet the user's water demand, and there is even a surplus of heat, so that the heat storage of the water tank can be reduced in the corresponding preset time period of the next preset cycle; the operation control method adjusts the operation state of the heat pump system according to the operation time of the electric heater, so that the water temperature of the water tank of the heat pump water heater is more in line with the user's water demand, reduces the heating frequency of the water tank, and effectively improves the energy efficiency of the heat pump water heater.

[0053] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is not zero, the operation state of the heat pump system corresponding to the preset time period in the next preset cycle in step S220 includes:

[0054] The heat pump system is started in advance during a corresponding preset period of time in the next preset cycle.

[0055] In some embodiments, the running time of the electric heater last Tuesday was 3 hours, indicating that the user's water demand was large during the operation of the electric heater last Tuesday, and the water tank had insufficient heat storage to meet the user's water demand. Therefore, the heat pump system is turned on in advance next Tuesday to heat the water in the water tank, so that the water temperature of the water tank increases, thereby coping with the large water demand in the same period next Tuesday. It can be understood that by turning on the heat pump system in advance, the water temperature of the water tank is increased, that is, the water tank has more heat storage, which can effectively reduce the running time of the electric heater in the same period, and convert the heat originally required to be generated by the electric heater to be generated by the heat pump system, reducing the running time of the electric heater, thereby effectively improving the energy efficiency of the heat pump water heater.

[0056] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, the heat pump system is turned on for a first time period in advance, and the first time period is converted according to the heating power of the electric heater, the first operation time and the heating power of the heat pump system.

[0057] It is understandable that, since the heating power of the electric heater is generally different from the heating power of the heat pump system, the amount of water heated in the water tank during the same operating time is different. Therefore, it is necessary to convert the first duration according to the heating power of the electric heater, the first operating time of the electric heater and the heating power of the heat pump system, so that the amount of water heated in the water tank by the heat pump system during the first duration can cover the amount of water heated in the water tank by the electric heater during the first operating time, so that the electric heater does not need to be turned on. In a specific embodiment, the heat output of the electric heater to the water tank during the first operating time is equal to the heat output of the heat pump system to the water tank during the first duration. In some other embodiments, the first duration can also be set to be larger, so that the heat output of the electric heater to the water tank during the first operating time is greater than the heat output of the heat pump system to the water tank during the first duration, thereby making the heat storage capacity of the water in the water tank more sufficient to cope with the upcoming large water demand.

[0058] Reference Figure 3 In the operation control method of the heat pump water heater provided in some embodiments of the present invention, after the first duration is obtained by conversion, the method further includes step S310 and step S320:

[0059] Step S310: obtaining the second operation time of the heat pump system in a certain preset period;

[0060] Step S320: When the sum of the second operation duration and the first operation duration is greater than the total duration of a preset period, the target set temperature of the water tank is increased within the corresponding preset period.

[0061] It is understandable that if the operating time of the heat pump system last Tuesday was already long, for example, 18 hours, and the operating time of the electric heater was 3 hours, the heat pump system needs to be turned on 7 hours in advance this Tuesday according to the method of the aforementioned embodiment. At this time, the heat pump system needs to be turned on for 18 hours plus 7 hours this Tuesday, that is, 25 hours, which exceeds the maximum operating time of the day. Therefore, it is impossible to compensate for the heating capacity of the electric heater by simply extending the operating time of the heat pump system. In this embodiment, by raising the target set temperature of the water tank on Tuesday this week, for example, the original target set temperature of the water tank is 55°C, the target set temperature can be raised to 60°C on Tuesday this week, so that the heat pump system heats the water in the water tank to a higher temperature, thereby increasing the heat storage capacity of the water tank to cope with the upcoming large water demand.

[0062] Reference Figure 4 In a method for controlling the operation of a heat pump water heater provided by a specific embodiment of the present invention, when the first operation duration is not zero, the operation state of the heat pump system corresponding to the preset time period in the next preset cycle in step S220 is adjusted, including steps S410 to S430:

[0063] Step S410: converting the predicted advance time according to the heating power of the electric heater, the first operating time and the heating power of the heat pump system;

[0064] Step S420: obtaining the second operation time of the heat pump system in a certain preset period;

[0065] Step S430: When the sum of the second operating time and the predicted advance time is less than or equal to the total time of a preset period, the heat pump system is turned on in advance according to the predicted advance time; when the sum of the second operating time and the predicted advance time is greater than the total time of a preset period, the heat pump system is controlled to be continuously turned on within the corresponding preset period and the target set temperature of the water tank is increased.

[0066] In this embodiment, the predicted advance time is first calculated through the first operating time of the electric heater, combined with the heating power of the electric heater and the heating power of the heat pump system, and then a determination is made as to whether there is sufficient time within the preset period to start the heat pump system in advance; if there is sufficient time, the heat pump system is started in advance according to the predicted advance time, thereby increasing the heat storage capacity of the water tank to cope with the upcoming large water demand; if there is not sufficient time, the heat pump system is controlled to continue to be turned on and the target set temperature of the water tank is increased, so that the heat pump system heats the water in the water tank to a higher temperature, thereby increasing the heat storage capacity of the water tank to cope with the upcoming large water demand.

[0067] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is zero, the operation state of the heat pump system corresponding to the preset time period in the next preset cycle in step S220 includes:

[0068] During a corresponding preset period of time in the next preset cycle, the target set temperature of the water tank is lowered.

[0069] In some embodiments, the operating time of the electric heater last Tuesday was zero, that is, the electric heater was not turned on, indicating that the heat storage of the water tank last Tuesday was able to meet the user's water demand, and there was even a heat surplus. Therefore, the target setting temperature of the water tank is lowered next Tuesday. For example, the original target setting temperature was 55°C, and now it is set to 52°C, so that the operating time of the heat pump system next Tuesday is shortened, the heat storage of the water tank is reduced, and energy saving and consumption reduction are achieved as much as possible while meeting the user's water demand.

[0070] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, when the first operation time is zero and the target set temperature of the water tank cannot be reduced, adjusting the operation state of the heat pump system corresponding to the preset time period in the next preset cycle includes:

[0071] The heat pump system is started up with a delay during a corresponding preset period of time in the next preset cycle.

[0072] It is understandable that if the target setting temperature of the water tank is already the minimum value of the allowable set temperature range, for example 50°C, then the heat storage capacity of the water tank cannot be reduced by lowering the target setting temperature of the water tank. At this time, the heat storage capacity of the water tank can be reduced by delaying the start of the heat pump system. For example, under normal circumstances, when the water temperature in the water tank drops to below the second preset temperature of 46°C, the heat pump system needs to be turned on, but at this time it is not turned on directly. After a period of time has been set, the heat pump system is turned on, thereby reducing the heat storage capacity of the water tank and achieving energy saving and consumption reduction as much as possible while meeting the user's water demand.

[0073] In the operation control method of the heat pump water heater provided in some embodiments of the present invention, the preset cycle is one week and the preset time period is one day. Since the water usage habits of users within a week have certain similarities, it is more representative to set the preset cycle to one week. It is understandable that in some other embodiments, the preset cycle may also be different, such as three days, two weeks or one month. Similarly, the preset time period may also be different, such as two days.

[0074] The operation control method of the heat pump water heater of the present invention is explained below in conjunction with a specific embodiment.

[0075] like Figure 1 As shown, the water tank 100 of the heat pump water heater is provided with a water tank liner 110 for storing hot water, a cold water inlet 120 and a hot water outlet 130 connected to the water tank liner 110, and an electric heater 200 is also provided inside the water tank liner 110, and the electric heater 200 is used to quickly supplement heat when the heat pump system is insufficient. The heat pump system includes a condenser 300 arranged in the water tank liner 110, and the condenser 300 is used to transfer the heat of the heat pump system to the water in the water tank liner 110 to heat the water in the water tank liner 110. In addition, a temperature sensor 140 for measuring the water temperature of the water tank is also provided inside the water tank liner 110.

[0076] The standard temperature control mode of heat pump water heater is:

[0077] When the water temperature of the water tank is lower than the second preset temperature (e.g. 46°C), the heat pump system is turned on, and when the water temperature of the water tank reaches the target set temperature (e.g. 55°C), the heat pump system is stopped;

[0078] When the water temperature of the water tank is lower than the first preset temperature (for example, 36° C.), the electric heater is turned on, and when the water temperature of the water tank reaches the target set temperature (for example, 55° C.), the electric heater is stopped.

[0079] Figure 5This is a schematic diagram of the change of water temperature in the water tank over time obtained by the heat pump water heater under the existing standard temperature control mode using the EN 16147 standard test method. The test of the heat pump water heater can be divided into: 1. The water heater heating stage; 2. The water heater water temperature maintenance stage; 3. The domestic water output and hot water replenishment stage; 4. The hot water output test stage in the water tank. Among them, the third stage simulates the user's demand for hot water at different temperatures and different times of the day under a specific water consumption. Therefore, it is closer to the actual use needs and is also the stage that has a greater impact on the unit's capacity and energy efficiency. During the entire test and use process, the unit controls the hot water output and heating according to the standard temperature control mode.

[0080] By analyzing the data obtained from the experimental test, the following two experimental phenomena can be obtained: Experimental phenomenon 1: Although high water temperature in the water tank is more conducive to ensuring hot water supply, as the temperature in the water tank increases, the unit energy efficiency decreases sharply; Experimental phenomenon 2: The more cold water in the water tank, the better the unit energy efficiency. Based on this, on the basis of the existing standard temperature control mode, the following two control strategies are proposed: Control strategy 1: Based on the actual water temperature, the target temperature in the water tank should be reduced as much as possible while meeting the heat demand; Control strategy 2: Based on the actual water temperature, while meeting the heat demand, try to allow more cold water to enter before heating to avoid frequent start and stop.

[0081] Reference Figure 6 , the operation control method of the heat pump water heater provided by some embodiments of the present invention comprises the following steps:

[0082] The heat pump water heater controls the operation and stop of the heat pump system and the electric heater in the standard temperature control mode described above;

[0083] With a weekly cycle, record the start time, operating time, ambient temperature, water tank water temperature and other operating data of the heat pump system, as well as the start time, stop time and operating time of the electric heater;

[0084] Take one day as a unit to determine whether the electric heater is turned on that day;

[0085] If the electric heater is turned on on that day, the running time of the electric heater on that day is obtained, and then the heating power of the electric heater and the heating power of the heat pump system are combined to calculate the heating time required for the heat pump system to generate the heat generated by the electric heater on that day, which is used as the running time that needs to be extended on the basis of the original running time of the heat pump system on that day of the next week; further determine whether the original running time of the heat pump system on that day plus the running time that needs to be extended exceeds the maximum running time of the day; if not, control the heat pump system to start in advance on the day of the next week according to the running time that needs to be extended; if it exceeds, increase the target set temperature of the water tank on that day of the next week;

[0086] If the electric heater is not turned on on that day, it is further determined whether the target set temperature of the water tank is higher than the limit water temperature, where the limit water temperature is the minimum value of the temperature range allowed for the target set temperature of the water tank; if it is higher than the limit water temperature, the target set temperature of the water tank for the next week will be lowered; if it is not higher than the limit water temperature, then on the next week when the start-up conditions of the heat pump system are met, the heat pump system will not be turned on directly, but will be turned on after a certain period of time, that is, the heat pump system is controlled to be turned on with a delayed start.

[0087] In some embodiments, if the electric heater is started and runs for 3 hours on Wednesday, the heat pump system will be turned on 5 hours in advance next Wednesday to replace the heat generated by the electric heater running for 3 hours; if the heat pump system cannot be turned on 5 hours in advance next Wednesday due to too long running time, the target setting temperature of the water tank will be increased from 55°C to 60°C on that day to increase the heat storage capacity of the water tank next Wednesday; if the electric heater is not turned on all day on Tuesday, the target setting temperature of the water tank will be reduced from 55°C to 52°C next Tuesday; if the target setting temperature of the water tank has been adjusted to the minimum value on that day and cannot continue to decrease, the heat pump system will be delayed when the conditions for starting the heat pump system are met next Tuesday.

[0088] If the heat pump water heater is operated only in the standard temperature control mode, the target set temperature of the water tank is 55°C. When the water temperature of the water tank is lower than 46°C, the heat pump system is turned on for heating until the water temperature of the water tank reaches 55°C and stops. The maximum hot water usage time of the user on that day is 14:00 and 20:00, and the water temperature is 46°C and 50°C respectively. When the heat pump water heater does not adopt the operation control method provided by the embodiment of the present invention, the heat pump water heater always heats the water in the water tank to 55°C, and the heating is frequent and consumes more energy; when the heat pump water heater adopts the operation control method provided by the embodiment of the present invention, if the unit does not enable the electric heater on a certain day in the first week, the target set temperature of the water tank is lowered and the heating time is changed on the corresponding day of the next week; when the unit enables the electric heater on a certain day in the first week, the target set temperature of the water tank is increased and the heating time is changed on the corresponding day of the next week, and through multiple iterations, the unit finally has a water tank temperature of 46°C at 14:00 and a water tank temperature of 50°C at 20:00. Try not to turn on the computer at other times when heat consumption is low to achieve energy saving.

[0089] Reference Figure 7 The second aspect of the present invention provides an operation control device 700, including a memory 710, a processor 720, and a computer program stored in the memory 710 and executable on the processor 720. The processor 720 executes the program to implement the operation control method of the first aspect of the present invention, for example, to execute Figure 2 Steps S210 to S220 of the method, Figure 3Steps S310 to S320 of the method, Figure 4 Steps S410 to S430 of the method or execution Figure 6 Flowchart of the method in .

[0090] In addition, a third aspect of the present invention provides a heat pump water heater, comprising the operation control device 700 of the second aspect of the present invention.

[0091] In addition, a fourth aspect of the present invention provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the operation control method of the first aspect of the present invention, such as executing Figure 2 Steps S210 to S220 of the method, Figure 3 Steps S310 to S320 of the method, Figure 4 Steps S410 to S430 of the method or execution Figure 6 Flowchart of the method in .

[0092] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed methods above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium or a non-transitory medium and a communication medium or a temporary medium. As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0093] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for controlling the operation of a heat pump water heater, characterized in that: The heat pump water heater comprises a heat pump system, a water tank for heat exchange with the heat pump system, and an electric heater arranged in the water tank, and the method comprises: Obtaining a first operating time of the electric heater in a preset period of time within a preset cycle; According to the first operating time, the operating state of the heat pump system in a corresponding preset time period within a next preset cycle is adjusted to reduce the heating frequency of the water tank.

2. The operation control method according to claim 1, characterized in that: When the first operating time is not zero, adjusting the operating state of the heat pump system for a corresponding preset period in the next preset cycle includes: The heat pump system is started in advance during a corresponding preset period of time in the next preset cycle.

3. The operation control method according to claim 2, characterized in that: The heat pump system is turned on for a first time period in advance, and the first time period is obtained by converting the heating power of the electric heater, the first operating time, and the heating power of the heat pump system.

4. The operation control method according to claim 3, characterized in that: The amount of heat output by the electric heater to the water tank during the first operating time is equal to the amount of heat output by the heat pump system to the water tank during the first time.

5. The operation control method according to claim 3, characterized in that: After the first duration is obtained by conversion, the method further includes: Obtaining a second operating time of the heat pump system in the preset time period; When the sum of the second operating time and the first time is greater than the total time of the preset period, the target set temperature of the water tank is increased within the corresponding preset period.

6. The operation control method according to claim 1, characterized in that: When the first operating time is not zero, adjusting the operating state of the heat pump system for a corresponding preset period in the next preset cycle includes: The predicted advance time is obtained by converting the heating power of the electric heater, the first operating time and the heating power of the heat pump system; Obtaining a second operating time of the heat pump system in the preset time period; When the sum of the second operating time and the predicted advance time is less than or equal to the total time of a preset time period, the heat pump system is turned on in advance by the predicted advance time period; when the sum of the second operating time and the predicted advance time is greater than the total time of a preset time period, the heat pump system is controlled to be continuously turned on and the target set temperature of the water tank is increased within the corresponding preset time period.

7. The operation control method according to claim 1, characterized in that: When the first operating time is zero, adjusting the operating state of the heat pump system for a corresponding preset time period in the next preset cycle includes: During a corresponding preset period of time in the next preset cycle, the target set temperature of the water tank is lowered.

8. The operation control method according to claim 1, characterized in that: When the first operating time is zero and the target set temperature of the water tank cannot be lowered, adjusting the operating state of the heat pump system for a corresponding preset period in the next preset cycle includes: The heat pump system is started up with a delay during a corresponding preset period in the next preset cycle.

9. The operation control method according to claim 1, characterized in that: The preset period is one week, and the preset time period is one day.

10. An operation control device, characterized in that: The system comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the operation control method according to any one of claims 1 to 9.

11. A heat pump water heater, characterized in that: Includes the operation control device as claimed in claim 10.

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

Images