Defrosting method and device of hot water unit, hot water unit and electronic equipment

Abstract

The invention relates to a defrosting method and device of a hot water unit, the hot water unit and electronic device.The method comprises the steps that the defrosting duration of a current defrosting period is determined on the basis of a target factor and the defrosting duration of a previous defrosting period, the target factors comprise the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit; wherein the defrosting duration of the first defrosting period is a first preset duration; the environment temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit in the current defrosting period are obtained; the compressor frequency of the hot water unit is determined based on the temperature difference between the environment temperature and the defrosting temperature; and within the defrosting duration of the current defrosting period, the hot water unit is defrosted according to the determined compressor frequency. By means of the defrosting control method and device, the problem that in the prior art, defrosting control of the hot water unit is achieved through the defrosting condition set at the fixed environment temperature, and consequently the defrosting effect is poor is solved.

Description

Technical Field

[0001] This application relates to the field of defrosting technology for hot water units, and more particularly to a defrosting method and apparatus for hot water units, a hot water unit, and electronic equipment. Background Technology

[0002] In low-temperature and high-humidity winter environments, the fins of hot water units are prone to frosting during heating, resulting in a decrease in heat exchange efficiency of over 40%, a sharp drop in capacity, and potential triggering of low-pressure protection shutdown. Existing defrosting control relies solely on set defrosting conditions within a fixed ambient temperature range, failing to adapt to changes in frost thickness in real time. This leads to deviations in defrosting timing, excessively long or short defrosting cycles, overall low heating efficiency, and a significant reduction in user comfort.

[0003] There is currently no effective solution to the aforementioned technical problems in existing technologies. Summary of the Invention

[0004] This application provides a defrosting method and apparatus for a hot water unit, a hot water unit, and electronic equipment to solve the problem that the defrosting control of hot water units in the prior art is poor due to the defrosting effect caused by defrosting conditions set under a fixed ambient temperature.

[0005] In a first aspect, this application provides a defrosting method for a hot water unit, comprising: determining the defrosting duration of the current defrosting cycle based on target factors and the defrosting duration of previous defrosting cycles, wherein the target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit; wherein the defrosting duration of the first defrosting cycle is a first preset duration; obtaining the ambient temperature of the environment in which the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle; determining the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature; and defrosting the hot water unit at the determined compressor frequency within the defrosting duration of the current defrosting cycle.

[0006] Optionally, the defrosting duration of the current defrosting cycle is determined based on the target factors and the defrosting duration of the previous defrosting cycle, including: determining the defrosting duration of the second and third defrosting cycles based on the heat exchange capacity attenuation rate and the defrosting duration of the previous defrosting cycle; and from the fourth defrosting cycle onwards, determining the defrosting duration of the current defrosting cycle based on the heating energy efficiency ratio and the defrosting duration of the previous defrosting cycle.

[0007] Optionally, determining the defrosting duration of the second and third defrosting cycles based on the heat exchange capacity attenuation rate and the defrosting cycle of the previous defrosting cycle includes: if the heat exchange capacity attenuation rate is greater than a first preset threshold, determining the defrosting duration of the second defrosting cycle by subtracting the product of the heat exchange capacity attenuation rate and the first preset duration from the first preset duration; if the heat exchange capacity attenuation rate is less than or equal to the first preset threshold, determining the defrosting duration of the second defrosting cycle by adding the product of the heat exchange capacity attenuation rate and the first preset duration to the first preset duration; and determining the defrosting duration of the third defrosting cycle by averaging the first preset duration and the defrosting duration of the second defrosting cycle.

[0008] Optionally, starting from the fourth defrost cycle, the defrost duration of the current defrost cycle is determined based on the heating efficiency ratio and the defrost duration of the previous defrost cycle, including: the defrost duration of each defrost cycle after the fourth defrost cycle is determined in the following way: first, the heating efficiency ratios of the second and third defrost cycles before the current defrost cycle to be determined are determined, and the average of the defrost duration of the defrost cycle with the higher heating efficiency ratio and the defrost duration of the first defrost cycle before the current defrost cycle to be determined is determined as the defrost duration of the current defrost cycle to be determined.

[0009] Optionally, the method further includes: in the process of determining the defrosting duration of the fourth defrosting cycle and subsequent defrosting cycles, if the difference between the defrosting duration of the current defrosting cycle and the defrosting duration of the previous defrosting cycle is less than the target duration, the defrosting duration of the current defrosting cycle is determined as the duration of each subsequent defrosting cycle.

[0010] Optionally, the heating efficiency ratio is determined by the following method: during the first defrosting cycle, the current first heat exchange and the second heat exchange before the second preset time are detected; if the absolute value of the difference between the first heat exchange and the second heat exchange is less than the product of the second heat exchange and the preset parameter, the current first heat exchange is determined as the stable value of the heat exchange; the ratio of the stable value to the real-time heat exchange is determined as the heating efficiency ratio.

[0011] Optionally, determining the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature includes: determining the compressor frequency of the hot water unit as a first frequency value when the temperature difference is less than or equal to a first temperature; determining the compressor frequency of the hot water unit as a second frequency value when the temperature difference is greater than the first temperature and less than or equal to a second temperature; and determining the compressor frequency of the hot water unit as a third frequency value when the temperature difference is greater than the second temperature; wherein the first frequency value is less than the second frequency value, and the second frequency value is less than the third frequency value.

[0012] Secondly, this application provides a defrosting device for a hot water unit, comprising: a first determining module, configured to determine the defrosting duration of the current defrosting cycle based on target factors and the defrosting duration of previous defrosting cycles, wherein the target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit; wherein the defrosting duration of the first defrosting cycle is a first preset duration; an acquiring module, configured to acquire the ambient temperature of the environment in which the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle; a second determining module, configured to determine the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature; and a defrosting module, configured to defrost the hot water unit at the determined compressor frequency within the defrosting duration of the current defrosting cycle.

[0013] Thirdly, a hot water unit includes the defrosting device described in the second aspect.

[0014] Fourthly, this application provides an electronic device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to perform the defrosting method for a hot water unit as described in the first aspect.

[0015] Compared with the prior art, the technical solution provided in this application has the following advantages: The method provided in this application combines the heat exchange capacity attenuation rate (characterizing the decrease in heat transfer efficiency of the hot water unit), the heating energy efficiency ratio (characterizing the effect of the previously determined defrosting time), and the defrosting time of the previous defrosting cycle to determine a more reasonable defrosting time. Furthermore, in this application embodiment, the compressor frequency of the hot water unit is determined by the temperature difference between the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle. Since the temperature difference is greater the thicker the frost layer, the compressor frequency determined by this temperature difference meets the current needs; that is, the compressor frequency can be dynamically adjusted. Therefore, in this application embodiment, both the defrosting time and the compressor frequency are determined based on the actual needs of the current defrosting situation, rather than defrosting under fixed conditions as in the prior art. In other words, defrosting using the defrosting method in this application makes the defrosting process more reasonable, avoids energy waste, and thus improves the operating economy and user comfort of the hot water unit. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 A flowchart illustrating a defrosting method for a hot water unit provided in this application embodiment; Figure 2 A schematic diagram of the first defrosting cycle provided in an embodiment of this application; Figure 3 A schematic diagram of the second defrosting cycle provided in an embodiment of this application; Figure 4 A schematic diagram illustrating the determination of defrosting time for the first four defrosting cycles provided in this application embodiment; Figure 5 A flowchart illustrating the method for determining defrosting time provided in this application embodiment; Figure 6A flowchart illustrating the method for determining compressor frequency provided in an embodiment of this application; Figure 7 This is a schematic diagram of the defrosting structure of a hot water unit provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0021] To address the problem of poor defrosting performance in existing hot water unit defrosting control methods that rely on fixed ambient temperature and set defrosting conditions, this application provides a defrosting method for hot water units, such as... Figure 1 As shown, the steps of this method include: Step 101: Determine the defrosting duration of the current defrosting cycle based on the target factors and the defrosting duration of the previous defrosting cycle. The target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit. The defrosting duration of the first defrosting cycle is the first preset duration. It should be noted that previous defrosting cycles refer to all defrosting cycles other than the first defrosting cycle. Furthermore, the heat exchange capacity decay rate of the hot water unit characterizes the proportion of decrease in the unit's heat transfer efficiency. Therefore, by using this heat exchange capacity decay rate, one can determine how much the unit's performance has deteriorated. Thus, using the heat exchange capacity decay rate as one of the factors in determining the defrosting duration allows for a more accurate determination. Additionally, the heating efficiency ratio (HER) is a dynamic parameter of the hot water unit. The HER indicates the effectiveness of the previously determined defrosting duration. Therefore, in this application, combining the heat exchange capacity decay rate, the HER, and the defrosting duration of previous defrosting cycles allows for the determination of a more reasonable defrosting duration.

[0022] Step 102: Obtain the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle; Step 103: Determine the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature; As can be seen, in this embodiment, the difference between the ambient temperature and the defrosting temperature of the hot water unit can be used to determine the thickness of the current frost layer. The larger the difference, the thicker the frost layer. Therefore, the required compressor frequency can be determined by this difference. Compared with the defrosting conditions set under a fixed ambient temperature range in the prior art, the defrosting method in this application is more reasonable and can meet the needs of users.

[0023] Step 104: Defrost the hot water unit at a determined compressor frequency within the defrosting duration of the current defrosting cycle.

[0024] By combining steps 101 to 104 above, the heat exchange capacity attenuation rate (characterizing the decrease in heat transfer efficiency of the hot water unit), the heating efficiency ratio (characterizing the effectiveness of the previously determined defrosting time), and the defrosting time of previous defrosting cycles, a more reasonable defrosting time can be determined. Furthermore, in this embodiment, the compressor frequency of the hot water unit is determined by the temperature difference between the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle. Since the temperature difference is greater the thicker the frost layer, the compressor frequency determined by this temperature difference meets the current requirements; that is, the compressor frequency can be dynamically adjusted. Therefore, in this embodiment, both the defrosting time and the compressor frequency are determined based on the actual needs of the current defrosting situation, rather than defrosting under fixed conditions as in the prior art. In other words, the defrosting method in this application makes the defrosting process more reasonable, avoids energy waste, and thus improves the operating economy and user comfort of the hot water unit.

[0025] In this embodiment of the application, the method of determining the defrosting duration of the current defrosting cycle based on the target factor and the defrosting duration of the previous defrosting cycle involved in step 101 above may further include: Step 11: Determine the defrosting duration of the second and third defrosting cycles based on the heat exchange capacity decay rate and the defrosting cycle of the previous defrosting cycle. Step 12: Starting from the fourth defrost cycle, determine the defrost duration of the current defrost cycle based on the heating efficiency ratio and the defrost duration of the previous defrost cycle.

[0026] Therefore, in this embodiment of the application, there are two different stages for determining the defrosting time. The first stage is the determination of the defrosting time for the second and third defrosting cycles (the defrosting time for the first defrosting cycle is preset), and the second stage is the determination of the defrosting time from the fourth defrosting cycle onwards.

[0027] The heat exchange capacity of a brand-new hot water unit and an old unit that has been running for many years differs drastically. Using excessively long defrosting times for a new unit leads to energy waste; using excessively short defrosting times for an old unit results in incomplete defrosting, creating a vicious cycle. The heat exchange capacity decay rate, however, is a state variable that directly reflects the current performance level of the unit's hardware and is a relatively stable indicator. Determining the defrosting time based on the heat exchange capacity decay rate is equivalent to providing an initial condition suitable for determining the defrosting time of the hot water unit at the start of defrosting. Therefore, using the heat exchange capacity decay rate as the condition for determining the defrosting time in the first stage avoids a lengthy trial-and-error process starting with a fixed initial value. Through the second adjustment (adjusting based on the heat exchange capacity decay rate) and the third adjustment (taking the average of the first two), the defrosting time can be calibrated to a relatively reasonable range in a short period (only two cycles). Furthermore, a shorter initial time can be tailored for old units with severely degraded performance to prevent over-defrosting, while providing more sufficient time for new units with good performance to ensure effective defrosting.

[0028] In the second stage, since the heating efficiency ratio (HER) is an effective metric, it measures the actual efficiency of restoring heating after the previous defrosting strategy (duration) has been executed. Whether the defrosting duration is optimal ultimately depends on the heating effect. A high HER indicates that the previous defrosting duration was set reasonably, effectively defrosting without wasting excessive time on unnecessary work. However, the degree of frosting depends not only on the unit itself but also on ambient temperature and humidity. The HER is a perfect indicator that comprehensively reflects the unit's status and current environmental conditions. Therefore, starting from the fourth defrosting cycle, the HER is used as a condition for determining the defrosting duration, ensuring that the determination of the defrosting duration remains relatively reasonable.

[0029] Furthermore, in an optional embodiment of this application, the method of determining the defrosting duration of the second and third defrosting cycles based on the heat exchange capacity attenuation rate and the defrosting cycle of the previous defrosting cycle in step 11 above may further include: Step 21: If the heat exchange capacity decay rate is greater than the first preset threshold, the difference between the first preset duration and the product of the heat exchange capacity decay rate and the first preset duration is determined as the defrosting duration of the second defrosting cycle. Step 22: If the heat exchange capacity decay rate is less than or equal to the first preset threshold, the sum of the first preset time plus the product of the heat exchange capacity decay rate and the first preset time is determined as the defrosting time of the second defrosting cycle. Step 23: Determine the average of the first preset time and the defrosting time of the second defrosting cycle as the defrosting time of the third defrosting cycle.

[0030] In a specific example, taking a first preset duration of 10 minutes and a first preset threshold of 5% as an example, if the heat exchange capacity attenuation rate is 6% when determining the defrost duration of the second defrost cycle, which is greater than the first preset threshold of 5%, then the second defrost duration = 10 × (1 - 0.06) = 9.4 minutes. If the heat exchange capacity attenuation rate is 4% when determining the defrost duration of the second defrost cycle, which is less than the first preset threshold of 5%, then the second defrost duration = 10 × (1 + 0.04) = 10.4 minutes. Therefore, the third defrost duration = (10 + 9.4) / 2 = 9.7 minutes, or the third defrost duration = (10 + 10.4) / 2 = 10.2 minutes. As can be seen from the embodiments of this application, through the above steps 21 to 23, by adjusting the second time (according to the increase or decrease of the heat exchange capacity decay rate) and the third time (taking the average of the first two times), the defrosting time can be calibrated to a relatively reasonable range in a shorter cycle (only 2 cycles).

[0031] Furthermore, in an optional embodiment of this application, the method of determining the defrosting duration of the current defrosting cycle based on the heating efficiency ratio and the defrosting duration of the previous defrosting cycle, as mentioned in step 12 above, can further include: Step 31: The defrosting time of each defrosting cycle after the fourth defrosting cycle is determined in the following way: First, determine the heating energy efficiency ratio of the second and third defrosting cycles before the current defrosting cycle to be determined, and then determine the average of the defrosting time of the defrosting cycle with the higher heating energy efficiency ratio and the defrosting time of the first defrosting cycle before the current defrosting cycle to be determined as the defrosting time of the current defrosting cycle to be determined.

[0032] Therefore, if the current defrosting cycle to be determined is the fourth defrosting cycle (T4), and the cycles from the first to the fourth are T1, T2, T3, and T4 respectively, then the second-to-last defrosting cycle before the fourth defrosting cycle refers to the second defrosting cycle (T2), and the third-to-last defrosting cycle before the fourth defrosting cycle refers to the first defrosting cycle (T1). If the current defrosting cycle to be determined is the fifth defrosting cycle (T5), then the second-to-last defrosting cycle before the fifth defrosting cycle refers to the third defrosting cycle (T3), and the fourth-to-last defrosting cycle before the fifth defrosting cycle refers to the second defrosting cycle (T2); and so on. In other words, the second-to-last defrosting cycle before the current defrosting cycle refers to the defrosting cycle that is one cycle prior to the current defrosting cycle, and the third-to-last defrosting cycle before the current defrosting cycle refers to the defrosting cycle that is two cycles prior to the current defrosting cycle.

[0033] Furthermore, in a specific example, taking the fourth defrost cycle as the current defrost cycle to be determined, the thermal efficiency ratios of the first and second defrost cycles are compared. The defrost cycle with the higher heating efficiency ratio (such as the second defrost cycle) is selected. Therefore, the defrost time of the fourth defrost cycle is the average of the durations of the third and second defrost cycles. A high heating efficiency ratio indicates that the previous defrost time was set reasonably, effectively defrosting the frost without wasting excessive time on unnecessary work. Therefore, when determining the defrost time for this cycle, choosing the defrost time with the higher heating efficiency ratio is more reasonable.

[0034] Furthermore, in this embodiment of the application, during the execution of step 31, if the difference between the defrosting time of the current defrosting cycle and the defrosting time of the previous defrosting cycle is less than the target time, the defrosting time of the current defrosting cycle is determined as the duration of each subsequent defrosting cycle.

[0035] The target duration can be set according to actual needs, such as 3 minutes. Therefore, after multiple defrosting cycles, if the defrosting duration of subsequent adjacent defrosting cycles varies very little, the optimal value is considered to have been found. The defrosting duration can then be fixed, reducing computational burden, avoiding unnecessary adjustments, improving the stability of the hot water unit's operation, and ensuring its long-term efficient operation.

[0036] In an optional embodiment of this application, the heating efficiency ratio can be determined in the following ways: Step 41: During the first defrosting cycle, detect the current first heat exchanger and the second heat exchanger before the second preset time. Step 42: If the absolute value of the difference between the first heat exchange and the second heat exchange is less than the product of the second heat exchange and the preset parameter, the current first heat exchange is determined as the stable value of the heat exchange. Step 43: Determine the ratio of the stable value to the real-time heat exchange as the heating efficiency ratio.

[0037] As can be seen, in this embodiment, the heating efficiency ratio can be determined by detecting the change in heat exchange during the first defrosting cycle. The current first heat exchange and the second heat exchange before a preset time (e.g., 30 seconds) are detected. If the absolute value of the difference between the two is less than the product of the second heat exchange and a preset parameter (e.g., 5%), then the current first heat exchange is determined as a stable value. Heating efficiency ratio = stable value / real-time heat exchange.

[0038] In this specific example, during the first defrost cycle, the initial heat exchange is 100kW, and the second heat exchange 30 seconds prior is 105kW. Calculating |100 - 105| = 5kW, and the second heat exchange × 5% = 105 × 0.05 = 5.25kW. Since 5 < 5.25, the initial heat exchange (100kW) is determined to be a stable value. Subsequently, the real-time heat exchange is 95kW, so the heating efficiency ratio = 100 / 95 ≈ 1.05. An efficiency ratio greater than 1 indicates high efficiency. Identifying the stable state through heat exchange changes and accurately calculating the heating efficiency ratio provides reliable data for adjusting defrost duration, avoiding misjudgments due to heat exchange fluctuations and improving the accuracy of defrost strategies.

[0039] In an optional embodiment of this application, the method of determining the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrost temperature in step 103 above may further include: Step 51: When the temperature difference is less than or equal to the first temperature, determine the compressor frequency of the hot water unit as the first frequency value; Step 52: When the temperature difference is greater than the first temperature and less than or equal to the second temperature, determine the compressor frequency of the hot water unit as the second frequency value. Step 53: When the temperature difference is greater than the second temperature, determine the compressor frequency of the hot water unit as the third frequency value; The first frequency value is less than the second frequency value, and the second frequency value is less than the third frequency value.

[0040] As can be seen, in this application, the compressor frequency can be determined based on the temperature difference between the ambient temperature and the defrost temperature. When the temperature difference is ≤ a first temperature (e.g., 5°C), the frequency is the first frequency value (30Hz); when the temperature difference is > the first temperature and ≤ a second temperature (e.g., 10°C), the frequency is the second frequency value (50Hz); when the temperature difference is > the second temperature, the frequency is the third frequency value (70Hz). The above frequency values ​​are merely illustrative examples. In specific application scenarios, appropriate settings can be made according to actual needs, as long as the temperature difference is greater, the frequency value should be greater.

[0041] In specific examples, if the ambient temperature is 20°C, the defrost temperature is 15°C, and the temperature difference is 5°C, then the compressor frequency is determined to be 30Hz. If the ambient temperature is 20°C, the defrost temperature is 10°C, and the temperature difference is 10°C, then the compressor frequency is determined to be 50Hz. If the ambient temperature is 20°C, the defrost temperature is 5°C, and the temperature difference is 15°C, then the compressor frequency is determined to be 70Hz. It is evident that in this embodiment, the compressor frequency can be intelligently adjusted based on the temperature difference: a small temperature difference indicates low defrost demand, using a low frequency to save energy; a large temperature difference indicates high defrost demand, using a high frequency for rapid defrosting.

[0042] The present application will now be explained in detail with reference to specific embodiments of the present application. These specific embodiments provide a defrosting control method for hot water units based on frost layer sensing and cycle optimization. First, the defrosting cycle will be explained, as follows: Figure 2 The diagram shows the first defrosting cycle, with time on the horizontal axis and water-side heat exchange on the vertical axis. It can be seen that the heating capacity gradually decreases as heating continues. This is because frost continuously forms on the fins, affecting heat exchange. Therefore, the Coefficient of Performance (COP) value during this defrosting cycle gradually decreases with the thickness of the frost. The unit will calculate the average COP for this cycle. Figure 3 The image shows the second defrosting cycle, at which point t... 制热2 The duration depends on the COP of the first defrost cycle. In this specific implementation, the defrost cycle is determined as follows: the defrost duration of the first defrost cycle is the default value. The defrost duration of the second defrost cycle can be determined based on the decay rate within the first defrost cycle, taking a more aggressive cycle. The defrost duration of the third defrost cycle is the average of the previous two durations. Starting from the fourth defrost cycle, the unit will detect the COP values ​​of the previous two defrost cycles, and the defrost duration t corresponding to the optimal defrost cycle will be determined. m The average duration of this defrosting cycle is the duration of the next defrosting cycle. The defrosting duration of the first four defrosting cycles is determined as follows: Figure 4 As shown, during unit defrosting, the first two defrosting cycles are determined based on the capacity decay rate, and subsequent cycles will compare the COP value and use a binary search method to quickly determine the optimal defrosting time.

[0043] Method for determining defrosting duration, such as Figure 5 shown, includes the following steps: Step 501, determine the heat exchange capacity attenuation rate during the first defrosting cycle; Step 502, determine whether the heat exchange capacity attenuation rate is greater than 10%. If so, execute Step 503; if not, execute Step 504; Step 503, determine that the defrosting duration of the second defrosting cycle is t2 = t1 - Φ × t1, where t2 is the defrosting duration of the second defrosting cycle, t1 is the defrosting duration of the first defrosting cycle, and Φ is the heat exchange capacity attenuation rate.

[0044] Step 504, determine that the defrosting duration of the second defrosting cycle is t2 = t1 + Φ × t1; Step 505, determine that the duration of the third defrosting cycle is directly the average of the previous two cycles, that is, t3 = (t1 + t2) / 2; Step 506, starting from the fourth defrosting cycle, the unit compares the COP values of the previous two defrosting cycles. If the COP of the first cycle COP1 > the COP of the second cycle COP2, then the duration of the fourth cycle t4 = (t1 + t3) / 2; if COP1 < COP2, then t4 = (t2 + t3) / 2, and this logic is followed for subsequent defrosting cycles.

[0045] Step 507, until the time difference between the newly calculated defrosting cycle duration and the last defrosting time is less than 3 minutes, lock the optimized defrosting duration.

[0046] It can be seen that through the above steps 501 to 507, based on the dynamic monitoring of the heat exchange capacity attenuation rate (Φ) and COP during the defrosting cycle, a "decay rate prediction + dichotomy adaptive optimization" two-stage control logic is constructed. That is, in the first defrosting cycle of this application embodiment, the decay rate Φ is used to predict the defrosting timing, and in subsequent cycles, by comparing the COP values of adjacent cycles and using the dichotomy method to quickly converge to the optimized defrosting duration, making the defrosting duration of the defrosting cycle more reasonable.

[0047] Furthermore, in the embodiment of this application, while determining the defrosting duration, it is also necessary to determine the frequency of the compressor. The specific process is as Figure 6 shown, includes the following steps: Step 601, when the unit enters the defrosting stage, collect the ambient temperature T air and the defrosting temperature T defrost , calculate ΔT = T air - T defrost ; Step 602, dynamically adjust the compressor frequency according to the ΔT value; Specifically, the frequency can be maintained at 40Hz when ΔT≤5℃; increased to 50Hz when 5℃<ΔT≤8℃; and increased to 60Hz when ΔT>8℃. Step 603: Control the compressor movement based on the determined compressor frequency.

[0048] As can be seen from steps 601 to 603 above, when the unit starts defrosting, the thickness of the frost layer is judged based on the difference between the ambient temperature and the defrosting temperature. If the temperature difference is large, it means that the frost layer is thicker, and a higher defrosting frequency is needed to make the defrosting speed faster, thereby reducing the defrosting time, so that the decrease in defrosting capacity does not affect the user experience.

[0049] Corresponding to the above Figure 1 This application provides a defrosting device for a hot water unit, such as... Figure 7 As shown, the device includes: The first determining module 702 is used to determine the defrosting duration of the current defrosting cycle based on target factors and the defrosting duration of previous defrosting cycles. The target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit. The defrosting duration of the first defrosting cycle is a first preset duration. The acquisition module 704 is used to acquire the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle. The second determining module 706 is used to determine the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature. The defrosting module 708 is used to defrost the hot water unit at a determined compressor frequency within the defrosting duration of the current defrosting cycle.

[0050] By combining the apparatus of this application embodiment with the heat exchange capacity attenuation rate (characterizing the percentage decrease in heat transfer efficiency of the hot water unit), the heating energy efficiency ratio (characterizing the effectiveness of the previously determined defrosting time), and the defrosting time of previous defrosting cycles, a more reasonable defrosting time can be determined. Furthermore, in this application embodiment, the compressor frequency of the hot water unit is determined by the temperature difference between the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle. Since the temperature difference is greater the thicker the frost layer, the compressor frequency determined by this temperature difference meets the current requirements; that is, the compressor frequency can be dynamically adjusted. Therefore, in this application embodiment, both the defrosting time and the compressor frequency are determined based on the actual needs of the current defrosting situation, rather than defrosting under fixed conditions as in the prior art. In other words, defrosting using the defrosting method of this application makes the defrosting process more reasonable, avoids energy waste, and thus improves the operating economy and user comfort of the hot water unit.

[0051] In an optional embodiment of this application, the first determining module in this application embodiment may further include: a first determining unit, configured to determine the defrosting duration of the second defrosting cycle and the third defrosting cycle based on the heat exchange capacity decay rate and the defrosting duration of the previous defrosting cycle; and a second determining unit, configured to determine the defrosting duration of the current defrosting cycle from the fourth defrosting cycle onwards based on the heating energy efficiency ratio and the defrosting duration of the previous defrosting cycle.

[0052] In an optional embodiment of this application, the first determining unit may further include: a first determining subunit, configured to determine the defrosting duration of the second defrosting cycle by subtracting the product of the heat exchange capacity attenuation rate and the first preset time from the first preset time when the heat exchange capacity attenuation rate is greater than the first preset threshold; a second determining subunit, configured to determine the defrosting duration of the second defrosting cycle by adding the product of the heat exchange capacity attenuation rate and the first preset time to the first preset time when the heat exchange capacity attenuation rate is less than or equal to the first preset threshold; and a third determining subunit, configured to determine the defrosting duration of the third defrosting cycle by averaging the first preset time and the defrosting duration of the second defrosting cycle.

[0053] In an optional embodiment of this application, the second determining unit in this application is used to perform the following steps: first, determine the heating energy efficiency ratio of the second and third defrosting cycles before the current defrosting cycle to be determined, and determine the average value of the defrosting time of the defrosting cycle with the higher heating energy efficiency ratio and the defrosting time of the first defrosting cycle before the current defrosting cycle to be determined as the defrosting time of the current defrosting cycle to be determined.

[0054] In an optional embodiment of this application, the apparatus further includes a third determining module, configured to determine the defrosting duration of the current defrosting cycle as the duration of each subsequent defrosting cycle if, during the process of determining the defrosting duration of the fourth defrosting cycle and subsequent defrosting cycles, the difference between the defrosting duration of the current defrosting cycle and the defrosting duration of the previous defrosting cycle is less than a target duration.

[0055] In an optional embodiment of this application, the heating efficiency ratio is determined in the following way: during the first defrosting cycle, the current first heat exchange and the second heat exchange before the second preset time are detected; if the absolute value of the difference between the first heat exchange and the second heat exchange is less than the product of the second heat exchange and the preset parameter, the current first heat exchange is determined as the stable value of the heat exchange; the ratio of the stable value to the real-time heat exchange is determined as the heating efficiency ratio.

[0056] In an optional embodiment of this application, the second determining module may further include: a third determining unit, configured to determine the compressor frequency of the hot water unit as a first frequency value when the temperature difference is less than or equal to the first temperature; a fourth determining unit, configured to determine the compressor frequency of the hot water unit as a second frequency value when the temperature difference is greater than the first temperature and less than or equal to the second temperature; and a fifth determining unit, configured to determine the compressor frequency of the hot water unit as a third frequency value when the temperature difference is greater than the second temperature; wherein the first frequency value is less than the second frequency value, and the second frequency value is less than the third frequency value.

[0057] like Figure 8 As shown in the figure, this application provides an electronic device, including a processor 811, a communication interface 812, a memory 813, and a communication bus 814, wherein the processor 811, the communication interface 812, and the memory 813 communicate with each other through the communication bus 814. Memory 813 is used to store computer programs; In one embodiment of this application, when the processor 811 executes the program stored in the memory 813, it implements the defrosting method of the hot water unit provided in any of the aforementioned method embodiments, and its function is similar, so it will not be described again here.

[0058] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the defrosting method for a hot water unit as provided in any of the foregoing method embodiments.

[0059] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0060] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0061] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0062] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A defrosting method for a hot water unit, characterized in that, include: The defrosting duration of the current defrosting cycle is determined based on the target factors and the defrosting duration of the previous defrosting cycle. The target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit. The defrosting duration of the first defrosting cycle is a first preset duration. Get the ambient temperature of the environment where the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle; The compressor frequency of the hot water unit is determined based on the temperature difference between the ambient temperature and the defrosting temperature. The hot water unit is defrosted at a determined compressor frequency within the defrosting duration of the current defrosting cycle.

2. The method according to claim 1, characterized in that, The defrosting duration for the current defrosting cycle is determined based on the target factors and the defrosting duration of previous defrosting cycles, including: The defrosting duration of the second and third defrosting cycles is determined based on the heat exchange capacity decay rate and the defrosting cycle of the previous defrosting cycle. Starting from the fourth defrost cycle, the defrost duration of the current defrost cycle is determined based on the heating efficiency ratio and the defrost duration of the previous defrost cycle.

3. The method according to claim 2, characterized in that, The defrosting duration of the second and third defrosting cycles is determined based on the heat exchange capacity decay rate and the defrosting cycle of the previous defrosting cycle, including: If the heat exchange capacity decay rate is greater than the first preset threshold, the difference between the first preset duration and the product of the heat exchange capacity decay rate and the first preset duration is determined as the defrosting duration of the second defrosting cycle. When the heat exchange capacity decay rate is less than or equal to the first preset threshold, the sum of the first preset duration and the product of the heat exchange capacity decay rate and the first preset duration is determined as the defrosting duration of the second defrosting cycle. The average of the first preset duration and the defrosting duration of the second defrosting cycle is determined as the defrosting duration of the third defrosting cycle.

4. The method according to claim 2, characterized in that, Starting from the fourth defrost cycle, the defrost duration of the current defrost cycle is determined based on the heating efficiency ratio and the defrost duration of the previous defrost cycle, including: The defrosting duration of each defrosting cycle after the fourth defrosting cycle is determined as follows: First, determine the heating efficiency ratio of the second and third defrosting cycles before the current defrosting cycle to be determined. Then, determine the average of the defrosting duration of the defrosting cycle with the higher heating efficiency ratio and the defrosting duration of the first defrosting cycle before the current defrosting cycle to be determined as the defrosting duration of the current defrosting cycle to be determined.

5. The method according to claim 4, characterized in that, The method further includes: In determining the defrosting duration of the fourth defrosting cycle and subsequent defrosting cycles, if the difference between the defrosting duration of the current defrosting cycle and the defrosting duration of the previous defrosting cycle is less than the target duration, the defrosting duration of the current defrosting cycle will be determined as the duration of each subsequent defrosting cycle.

6. The method according to claim 1, characterized in that, The heating efficiency ratio is determined in the following ways: During the first defrosting cycle, the current first heat exchanger is compared with the second heat exchanger before the second preset time. If the absolute value of the difference between the first heat exchange and the second heat exchange is less than the product of the second heat exchange and the preset parameter, the current first heat exchange is determined as the stable value of the heat exchange. The ratio of the stable value to the real-time heat exchange is determined as the heating efficiency ratio.

7. The method according to claim 1, characterized in that, Determining the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrost temperature includes: When the temperature difference is less than or equal to the first temperature, the compressor frequency of the hot water unit is determined to be the first frequency value; When the temperature difference is greater than the first temperature and less than or equal to the second temperature, the compressor frequency of the hot water unit is determined to be the second frequency value; When the temperature difference is greater than the second temperature, the compressor frequency of the hot water unit is determined to be the third frequency value; Wherein, the first frequency value is less than the second frequency value, and the second frequency value is less than the third frequency value.

8. A defrosting device for a hot water unit, characterized in that, include: The first determining module is used to determine the defrosting duration of the current defrosting cycle based on target factors and the defrosting duration of previous defrosting cycles. The target factors include the heat exchange capacity attenuation rate of the hot water unit and the heating energy efficiency ratio of the hot water unit. The defrosting duration of the first defrosting cycle is a first preset duration. The acquisition module is used to acquire the ambient temperature of the environment in which the hot water unit is located and the defrosting temperature of the hot water unit during the current defrosting cycle; The second determining module is used to determine the compressor frequency of the hot water unit based on the temperature difference between the ambient temperature and the defrosting temperature. The defrosting module is used to defrost the hot water unit at a determined compressor frequency within the defrosting duration of the current defrosting cycle.

9. A hot water unit, characterized in that, Includes the apparatus as described in claim 8.

10. An electronic device, characterized in that, include: The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus. The memory is used to store computer programs; the processor is used to execute the computer programs to implement the defrosting method of the hot water unit according to any one of claims 1-7.

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