Defrosting control method for air conditioning unit and related device

Abstract

The application provides a defrosting control method of an air conditioning unit and related equipment. The defrosting control method comprises: when multiple outdoor units in the air conditioning unit meet defrosting conditions, determining the frost degree of the outdoor units; based on the frost degree, sorting the outdoor units to obtain a defrosting sequence, wherein the thinner the frost of the outdoor units, the earlier the defrosting sequence, and controlling all the outdoor units to enter defrosting according to the sequence, so that the outdoor units with thin frost complete defrosting in priority. According to the frost degree of the outdoor units to be defrosted, the multiple outdoor units to be defrosted are sorted to obtain a defrosting sequence, so that the outdoor units to be defrosted with thin frost complete defrosting in priority. Since the defrosting time of the outdoor units to be defrosted with thinner frost is shorter, the overall speed of the current outdoor units to be defrosted entering the heating mode after completing defrosting is accelerated, so as to ensure the total heating capacity output by the current air conditioning unit.

Description

Technical Field

[0001] This application belongs to the field of heat exchange technology, and in particular relates to a defrosting control method and related equipment for air conditioning units. Background Technology

[0002] Air conditioning units can be used for heating in cold regions with low temperatures. During the operation of the outdoor unit, the outdoor heat exchanger will usually frost up, but the frost buildup will vary from unit to unit. Some outdoor units will have thick frost, while others will have thin frost. Moreover, current technology determines the defrosting order based on the sequence in which defrosting conditions are met. This can easily lead to some outdoor units taking too long from the start of the defrosting process to its completion, resulting in a decrease in the overall heating capacity of the air conditioning unit. Summary of the Invention

[0003] In view of this, this application provides a defrosting control method and related equipment for air conditioning units, which controls the order in which outdoor units to be defrosted enter the defrosting process, so as to prevent a decrease in the total heating capacity of the air conditioning unit.

[0004] The first aspect of this application provides a defrosting control method, which includes: when multiple outdoor units in an air conditioning unit meet the defrosting conditions, determining the degree of frost on the outdoor units; sorting the outdoor units according to the degree of frost to obtain the order in which they enter defrosting, wherein the thinner the frost on the outdoor unit, the earlier it enters the defrosting order; and controlling all outdoor units to enter defrosting according to the order, so that the outdoor units with thinner frost can complete defrosting first.

[0005] The above technical solution prioritizes multiple outdoor units awaiting defrosting based on the degree of frost buildup, determining their defrosting sequence. Units with thinner frost layers are defrosted first, ensuring they complete defrosting before the next unit. Since thinner frost layers result in shorter defrosting times, this accelerates the overall speed at which these units transition to heating mode after defrosting, thus guaranteeing the total heating capacity output of the current air conditioning unit.

[0006] In some embodiments of the first aspect, the air conditioning unit includes multiple outdoor units to be defrosted, and the method includes: when multiple outdoor units in the air conditioning unit meet the defrosting conditions, determining the degree of frost on the outdoor units; sorting the multiple outdoor units according to the degree of frost to obtain the order in which they enter the defrosting process, wherein the thinner the frost on the outdoor unit, the earlier it enters the defrosting process; and controlling all outdoor units to enter the defrosting process in the order so that the outdoor units with thinner frost can complete the defrosting process first.

[0007] In some embodiments of the first aspect, when multiple outdoor units in the air conditioning unit meet the defrosting conditions, the method further includes: obtaining the waiting time for defrosting, the defrosting interval time, and the frost thickness of the multiple outdoor units; then, determining the degree of frost on the outdoor unit, specifically: determining the degree of frost on the outdoor unit based on the waiting time for defrosting, the defrosting interval time, and the frost thickness.

[0008] In some embodiments of the first aspect, multiple outdoor units are sorted to obtain the order in which they enter defrost mode, including: determining a first weighted coefficient for the waiting time to defrost, a second weighted coefficient for the defrost interval, and a third weighted coefficient for the frost thickness; obtaining a first product based on the waiting time to defrost and the first weighted coefficient; obtaining a second product based on the defrost interval and the second weighted coefficient; obtaining a third product based on the frost thickness and the third weighted coefficient; obtaining the frost severity value of each outdoor unit based on the sum of the first product, the second product, and the third product; and sorting the frost severity values ​​in ascending order to obtain the order in which they enter defrost mode, wherein the smaller the frost severity value of the outdoor unit, the earlier it enters the defrost mode.

[0009] In some embodiments of the first aspect, the sum of the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient is 1.

[0010] In some embodiments of the first aspect, after obtaining the order of entering defrost, the method further includes: if there are multiple outdoor units in the current order, controlling multiple outdoor units to enter defrost.

[0011] In some embodiments of the first aspect, controlling all outdoor units to enter defrost sequentially further includes: obtaining the exhaust temperature of the compressors of all outdoor units; if the exhaust temperature value is greater than a temperature threshold, determining the order in which the outdoor units enter defrost as the first order, controlling the first outdoor unit to enter defrost, and updating the order in which they enter defrost.

[0012] In some embodiments of the first aspect, controlling all outdoor units to enter defrost sequentially includes:

[0013] The target number of outdoor units will enter the defrosting sequence.

[0014] The second aspect of this application provides an air conditioning unit, which includes a controller and multiple outdoor units to be defrosted, wherein the controller is used to execute the above-described defrosting control method.

[0015] A third aspect of this application provides a computer device, comprising: a processor adapted to execute a computer program; and a computer-readable storage medium storing the computer program, wherein when the computer program is executed by the processor, the above-described defrosting control method is performed.

[0016] A fourth aspect of this application provides a storage medium comprising: a storage medium storing computer instructions, which, when executed on a computing device, cause the computing device to perform the defrosting control method described above. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an air conditioning unit according to an embodiment of this application.

[0018] Figure 2 This is a schematic flowchart of a defrosting control method for an air conditioning unit according to an embodiment of this application.

[0019] Figure 3 This is an application scenario diagram of the defrosting control method for an air conditioning unit according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the structure of a computer device according to an embodiment of this application. Detailed Implementation

[0021] The term "multiple" in this application refers to two or more. Furthermore, it should be understood that the terms "first," "second," etc., used in the description of this application are used only for descriptive purposes and should not be construed as indicating or implying relative importance, nor as indicating or implying order.

[0022] The following is a brief explanation of the relevant technologies:

[0023] Air conditioning units, as devices that extract clean energy from the air, are used in medium to large-sized buildings. For example, in cold regions with low temperatures, medium to large-sized buildings often use air conditioning units for indoor heating. The units enter heating mode to generate heat and achieve indoor heating. Air conditioning units consist of multiple outdoor units. Under operating conditions (e.g., heating mode), the outdoor heat exchangers of the outdoor units typically frost over. However, the degree of frost buildup varies from unit to unit; some outdoor heat exchangers have thicker frost layers, while others have thinner ones. Furthermore, current technology determines the defrosting order based on the sequence in which defrosting conditions are met. This can easily lead to situations where outdoor units with thinner frost layers experience excessively long defrosting times, resulting in a decrease in the overall heating capacity of the current air conditioning unit.

[0024] In view of this, embodiments of this application provide a defrosting control method for an air conditioning unit, an air conditioning unit, a computer device, and a storage medium to control the order in which outdoor units to be defrosted enter the defrosting process, so as to avoid the problem of a decrease in the total heating capacity of the air conditioning unit.

[0025] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of an air conditioning unit 100 according to an embodiment of this application. The air conditioning unit 100 includes a controller 10 and multiple outdoor units 20. The controller 10 is used to control the outdoor units 20 that meet the defrosting conditions (i.e., the outdoor units 20 to be defrosted) to enter and exit the defrosting process in a preset order, so that the outdoor units 20 with thinner frost layers to be defrosted are prioritized to complete defrosting (the outdoor units 20 with thinner frost layers melt the frost layer in a shorter time after entering the defrosting process). This can speed up the overall speed at which the outdoor units 20 to be defrosted enter the heating mode after completing defrosting, ensuring the total heating output of the current air conditioning unit 100 while improving efficiency.

[0026] The total heating output of the current air conditioning unit 100 refers to the sum of the heating output of all outdoor units 20 currently in heating mode.

[0027] The outdoor unit 20 awaiting defrosting includes the outdoor unit 20 that gradually frosts up and meets the conditions for entering defrosting during the operation of the heating mode, and the outdoor unit 20 that stops operating the heating mode, reaches the degree of frost that meets the conditions for entering defrosting, and enters the standby state.

[0028] It is understood that the outdoor unit 20 includes a compressor and an outdoor heat exchanger. The outdoor heat exchanger is a finned heat exchanger, which includes fins and copper tubes passing through the fins. When the outdoor unit 20 is in heating mode, refrigerant flows into the finned heat exchanger through the copper tubes. The finned heat exchanger (which acts as an evaporator in heating mode) absorbs heat from the outside through the fins to convert the liquid refrigerant into a gaseous refrigerant. At the same time, the surface temperature of the fins decreases. When air flows through the evaporator, if the surface temperature of the fins is lower than the air dew point temperature and below 0°C, water will precipitate from the fins and form a frost layer, i.e., frosting.

[0029] When outdoor unit 20 enters defrost mode, the heat exchanger (which functions as a condenser in heating mode) releases heat to the outside through its fins, converting the gaseous refrigerant into a liquid refrigerant. As heat is released, the frost layer on the fins melts, achieving the defrosting effect. Simultaneously, outdoor unit 20 does not operate in heating mode during defrost, resulting in a decrease in the total heating capacity of the air conditioning unit 100.

[0030] It is understandable that the temperature of the finned heat exchanger in the outdoor unit 20 will change as it exchanges heat with the outside environment. A temperature sensor is installed on the side of the finned heat exchanger. The temperature sensor is used to detect the temperature of the finned heat exchanger. The outdoor unit 20 also includes an ambient temperature sensor, which is located outside the finned heat exchanger and is used to sense the temperature of the external environment.

[0031] Please see Figure 2 , Figure 2This is a flowchart illustrating the defrosting control method of an air conditioning unit 100 according to an embodiment of this application. The defrosting control method of this embodiment is applied to the controller 10 of the air conditioning unit 100, and includes the following steps:

[0032] Step S101: When multiple outdoor units in the air conditioning unit meet the defrosting conditions, determine the degree of frost on the outdoor units.

[0033] It is understandable that the temperature of the finned heat exchanger of the outdoor unit 20 will change when exchanging heat with the outside environment. In one example, the defrosting conditions can be met if the temperature of the external environment (i.e., the ambient temperature) Ta of the finned heat exchanger is less than a first value, and the temperature Te of the finned heat exchanger is less than a second value.

[0034] The degree of frost formation on the fins of the outdoor unit 20 can be visually represented by the thickness of the frost layer after frost formation. That is, the more severe the frost formation, the thicker the frost layer; the less severe the frost formation, the thinner the frost layer.

[0035] In one example, frost thickness is used to characterize the degree of frost formation on the outdoor unit 20. Specifically, a camera is installed at a location where the fins can be photographed (e.g., at the heat exchanger casing). Before the outdoor unit 20 is running, the controller 10 acquires a first photograph of the fins using the camera. After the outdoor unit 20 is running, for example, in heating mode, the controller 10 acquires multiple second photographs of the fins at preset time intervals using the camera, and obtains frost thickness information from both the first and second photographs. Then, the controller 10 subtracts the frost thickness of the first photograph from the frost thickness of the second photograph (it is understood that the frost thickness of the first photograph may be zero) to obtain the real-time frost thickness of the fins at the time the second photograph was taken.

[0036] Specifically, the following steps can be used to obtain the frost thickness information corresponding to the image: a) Photo preprocessing: Preprocess the acquired photo, including noise reduction, contrast enhancement, and brightness adjustment; b) Frost segmentation: Use photo segmentation techniques to separate the frost area to be tested from the background. Thresholding segmentation, edge detection, and region growing methods can be used to segment based on the color, texture, and shape features of the frost area; c) Feature extraction: Extract thickness-related features from the segmented frost area photo. The thickness of the frost area can be inferred based on its edges, texture, and grayscale changes. Commonly used methods include edge detection, texture analysis, and grayscale transformation; d) Feature measurement: Measure and calculate based on the extracted features. Based on the size and proportion of the frost area, combined with the number of pixels in the photo and the actual size, the thickness information of the frost layer can be calculated.

[0037] In another example, the imaging device can be replaced with an infrared measuring instrument. Specifically, the infrared measuring instrument emits infrared rays towards the fins. The controller 10 receives the infrared rays reflected from the fins, analyzes and compares the infrared rays reflected from the fins before and after the outdoor unit 20 operates, so as to obtain the real-time frost layer thickness of the fins of the outdoor unit 20.

[0038] Step S102: Sort multiple outdoor units based on the frosting degree to obtain the order of entering defrosting.

[0039] In one example, multiple outdoor units 20 to be defrosted are sorted according to the frost layer thickness. The lighter the frosting degree of the outdoor unit 20 to be defrosted (i.e., the thinner the frost layer), the thinner the frost layer thickness, and the earlier the order of entering defrosting. The order of entering defrosting is shown in Table 1 below.

[0040] Table 1, Defrosting order of outdoor units 20 to be defrosted

[0041] 111 H1 1 112 H2 2 113 H3 3 114 H4 4 …… …… …… N HN X

[0042] Where, H represents the frost layer thickness H of the outdoor unit 20 to be defrosted, and H1 < H2 < H3 < H4 < HN. X represents the order of entering defrosting. For example, after the outdoor unit 111 to be defrosted with order 1 defrosts first, the outdoor unit 112 to be defrosted with order 2 defrosts next, and then the outdoor unit 113 to be defrosted with order 3 defrosts, and so on.

[0043] Step S103: Control all outdoor units to defrost according to the order, so that the outdoor units with thinner frost finish defrosting first.

[0044] After obtaining the defrosting order, control all outdoor units to be defrosted based on this order, and control one or more outdoor units 20 to be defrosted to defrost, so that the outdoor units 20 to be defrosted with thinner frost finish defrosting first and then enter the heating mode, or enter the standby state and can enter the heating mode at any time.

[0045] It is understandable that the air conditioning unit 100 includes multiple outdoor units 20, and the outdoor units 20 undergoing defrosting do not produce heat. If, over a period of time, too many outdoor units 20 are defrosting and the defrosting process is lengthy, the total heating capacity of the air conditioning unit 100 will decrease during that period. Simultaneously, the frost layer obstructs airflow through the finned heat exchanger, reducing airflow. This reduced airflow lowers the heat exchange efficiency of the outdoor units 20, leading to decreased performance. If the outdoor units 20 with the thickest frost layer are defrosted first, their defrosting time will be longer, resulting in a significant decrease in the total heating capacity of the air conditioning unit 100 during that period. Therefore, prioritizing the defrosting of outdoor units 20 with thinner frost (those with thinner frost will melt faster) can accelerate the overall speed at which outdoor units 20 enter heating mode after defrosting, ensuring the total heating output of the current air conditioning unit 100, reducing the variation in the total heating output of the current air conditioning unit 100, and improving the heating efficiency of the air conditioning unit 100.

[0046] Please see Figure 3 In one application scenario, when four outdoor units 20 of the air conditioning unit 100 meet the defrosting conditions, the controller 10 determines the degree of frost on each outdoor unit 20 to be defrosted. Then, the controller 10 sorts the outdoor units 20 according to the degree of frost to determine the defrosting order. Subsequently, it controls outdoor unit 111 to defrost first, and after defrosting is completed, it controls outdoor unit 112 to defrost, and so on, until outdoor unit 114 is defrosted.

[0047] The above technical solution sorts multiple outdoor units 20 awaiting defrosting according to the degree of frost buildup, determining the defrosting order. The thinner the frost layer on an outdoor unit 20, the earlier it is ordered, ensuring that units with thinner frost layers defrost first. Since the defrosting time is shorter for outdoor units 20 with thinner frost layers, the overall speed at which these units enter heating mode after defrosting is accelerated, thus ensuring the total heating output of the current air conditioning unit 100.

[0048] Because the frost distribution and thickness of the finned heat exchanger of the outdoor unit awaiting defrosting may be inconsistent, some embodiments, in addition to directly measuring the frost thickness control method, also include adding operating parameters such as the waiting time for defrosting and the defrosting interval to assist in adjusting the degree of frost formation. Adding time-related parameters such as the waiting time for defrosting and the defrosting interval can better obtain the current degree of frost formation on the outdoor unit awaiting defrosting, and sort them according to the degree of frost formation from light to heavy, thus determining the order in which they enter the defrosting process. The lighter the degree of frost formation and the thicker the frost layer, the earlier the unit enters the defrosting process. Specifically, this includes the following steps:

[0049] Step S201: When multiple outdoor units in the air conditioning unit meet the defrosting conditions, obtain the waiting time for defrosting, the defrosting interval time, and the frost thickness of the multiple outdoor units 20 waiting to be defrosted.

[0050] The defrosting waiting time T1 refers to the time starting from when the outdoor unit 20 meets the defrosting conditions. For example, the controller 10 confirms that the outdoor unit 111 to be defrosted meets the defrosting conditions at time J, and starts calculating the defrosting waiting time of the outdoor unit 111. At time J+E, the defrosting waiting time of the outdoor unit 111 to be defrosted can be confirmed as E hours.

[0051] The defrosting interval T2 refers to the time interval between two adjacent defrosting operations. For example, if the outdoor unit 111 to be defrosted completes its first defrosting operation and is expected to defrost again in about S hours, then S hours is the defrosting interval.

[0052] It is understandable that, in addition to the decrease in heating efficiency caused by frost thickness and the decrease in the total heating capacity of the air conditioning unit 100, the defrosting time and defrosting interval are also factors affecting efficiency and total heating capacity. Therefore, the degree of frost on the outdoor unit 20 awaiting defrosting can be characterized by three parameters: defrosting time, defrosting interval, and frost thickness. Alternatively, the degree of frost on the outdoor unit 20 awaiting defrosting can be characterized by any one of these parameters.

[0053] Step S202: Determine the degree of frost on the outdoor unit based on the waiting time for defrosting, the defrosting interval, and the frost thickness.

[0054] Among them, the shorter the waiting time T1 for defrosting of the outdoor unit 20 to be defrosted, the shorter the defrosting interval T2, and / or the thinner the frost layer J, the lighter the degree of frost on the outdoor unit 20 to be defrosted, and the higher the ranking of the outdoor unit 20 to be defrosted.

[0055] It is understandable that a defrosting time T1 indicates that frost has formed on the outdoor unit 20 awaiting defrosting. The shorter the defrosting time T1, the shorter the duration of frost formation on the outdoor unit 20, and the less severe the frost buildup. Similarly, a shorter defrosting interval T2 indicates that the time since the last defrosting on the outdoor unit 20 is shorter, and the current degree of frost buildup on the outdoor unit 20 awaiting defrosting is less severe.

[0056] In some embodiments, step S202 further includes the following step:

[0057] Step S2021: Determine the first weighting factor for the waiting time for defrosting, the second weighting factor for the defrosting interval, and the third weighting factor for the frost thickness.

[0058] It is understandable that, using a priority algorithm, the waiting time for defrosting T1, the defrosting interval T2, and the frost thickness H are used to sort the multiple outdoor units 20 awaiting defrosting. Specifically, a first weighting coefficient a, a second weighting coefficient b, and a third weighting coefficient c are assigned to the defrosting time T1, the defrosting interval T2, and the frost thickness H, respectively. For example, the first weighting coefficient a is 0.5, the second weighting coefficient b is 0.3, and the third weighting coefficient c is 0.2.

[0059] Step S2022: Obtain the first product based on the waiting time for defrosting and the first weighting coefficient.

[0060] Step S2023: Obtain the second product based on the defrosting interval and the second weighting coefficient.

[0061] Step S2024: Obtain the third product based on the frost layer thickness and the third weighting coefficient.

[0062] Step S2025: Obtain the frost level value of each outdoor unit based on the sum of the first product, the second product, and the third product. Sort the frost level values ​​in ascending order to obtain the defrosting order.

[0063] Among them, the smaller the frosting degree value of outdoor unit 20, the earlier the defrosting sequence.

[0064] In one example, the priority algorithm is calculated as shown in formula (1).

[0065] M=T1xa﹢T2xb﹢Hxc(1)

[0066] Where M represents the degree of frost on each outdoor unit 20 awaiting defrosting, T1xa represents the first product (a can be 0.5), T2xb represents the second product (a can be 0.3), and Jxc represents the third product (a can be 0.2). It can be understood that the sum of the first weighting coefficient a, the second weighting coefficient b, and the third weighting coefficient c is 1.

[0067] It is understandable that after obtaining the frost level value M of each outdoor unit 20 to be defrosted, the outdoor units 20 with larger values ​​of M are sorted higher. After completing the sorting of all outdoor units 20 to be defrosted, in one example, the sorting order can be as shown in Table 2 below.

[0068] Table 2. Defrost sequence for outdoor unit 20 awaiting defrosting.

[0069]

[0070] The difference from Table 1 is that M represents the degree of frost on the outdoor unit 20 to be defrosted. The smaller the M, the higher the outdoor unit 20 is ranked. For example, outdoor unit 111 with a frost degree value of 0.1 is ranked higher than outdoor unit 112 with a value of 0.2, and outdoor unit 112 with a frost degree value of 0.2 is ranked higher than outdoor unit 113 with a value of 0.3.

[0071] It is understood that this embodiment fully considers the effects of the defrosting waiting time T1, the defrosting interval T2, and the frost thickness T3 on the frost formation of the outdoor unit 20 to be defrosted, and can more accurately determine the degree of frost formation of the outdoor unit 20 to be defrosted.

[0072] In some embodiments, after obtaining the defrosting sequence, the defrosting control method further includes: if there are multiple outdoor units in the current sequence, controlling multiple outdoor units to enter the defrosting phase.

[0073] This is understandable. When multiple outdoor units 20 awaiting defrosting are in the same order, they can defrost simultaneously, ensuring that units at the same defrost thickness undergo defrosting. This avoids having too many outdoor units 20 awaiting defrosting, which would result in low efficiency.

[0074] It is understandable that since the degree of frost on the outdoor unit 20 waiting to be defrosted is higher than that on the outdoor unit 20 that does not meet the defrosting conditions, the heating efficiency of the outdoor unit 20 waiting to be defrosted is lower than that on the outdoor unit 20 that does not meet the defrosting conditions. Controlling multiple outdoor units 20 waiting to be defrosted to defrost simultaneously can further improve the efficiency of the entire air conditioning unit 100.

[0075] In one example, the outdoor units 20 to be defrosted are sorted according to the waiting time for defrosting, the defrosting interval, and the frost thickness. The resulting defrosting order is shown in Table 3 below.

[0076] Table 3. Defrost sequence for outdoor units 20 awaiting defrosting.

[0077]

[0078]

[0079] After obtaining the order in Table 3, the controller 10 can control the outdoor units 111 and 112 to be defrosted simultaneously.

[0080] In some embodiments, controlling all outdoor units 20 to defrost in sequence includes: entering defrost according to a specified target number of outdoor units in the sequence.

[0081] The target number of outdoor units 20 awaiting defrosting refers to the final number of outdoor units 20 that are scheduled for defrosting. This is understood to be based on considerations such as the current heating capacity of the air conditioning unit 100, the target heating capacity, and the user's temperature requirements. Based on the defrosting order, the target number of outdoor units 20 awaiting defrosting can be further determined.

[0082] In one example, after the controller 10 obtains the defrosting sequence as shown in Table 3, it determines that four units need to be defrosted based on the current heating capacity, the target heating capacity, and the user's temperature requirements. At this time, outdoor units 111, 112, 113, and 114 can be specified for defrosting.

[0083] In some embodiments, step S103 further includes the following steps:

[0084] Step S301: Obtain the exhaust temperature of the compressors of all outdoor units.

[0085] It is understood that the controller 10 continuously acquires the operating parameters of the outdoor unit 20 to be defrosted, including the compressor's exhaust temperature. Specifically, a temperature sensor is provided at the end of the compressor used for exhaust, and the temperature sensor is used to sense the compressor's exhaust temperature.

[0086] Step S302: If the exhaust temperature is greater than the temperature threshold, determine the outdoor unit defrosting order as the first order, control the defrosting of the first outdoor unit, and update the defrosting order.

[0087] The temperature threshold can be set according to the actual situation. Understandably, in one case, when the fins of the outdoor unit 20's finned heat exchanger are severely frosted, the compressor needs to increase its power to convert the refrigerant into a high-temperature, high-pressure gas and discharge it. The temperature of the discharged gas (i.e., the exhaust temperature) will continue to rise. When the exhaust temperature continues to rise to the temperature threshold, it will trigger the controller 10 to execute a protection strategy, that is, the controller 10 controls the air conditioning unit 100 to enter the protection mode. After the air conditioning unit 100 enters the protection mode, it will no longer provide heating.

[0088] Therefore, when the exhaust temperature exceeds the temperature threshold, the defrosting sequence of the outdoor unit 20 corresponding to that compressor can be determined as the first order, and the defrosting of the first outdoor unit 20 can be controlled. After the outdoor unit 20 defrosts, it can then enter the heating mode. At the same time, the controller 10 does not execute the protection strategy, and the heat pump unit continues to operate normally and provide normal heating.

[0089] After controlling the defrosting of the first outdoor unit 20, the defrosting order is updated so that the outdoor units 20 that are ranked after the first outdoor unit 20 are promoted one order.

[0090] In one example, controller 10 obtains the exhaust temperature of the compressors of all outdoor units 20 awaiting defrosting from Table 1. The exhaust temperature of outdoor unit 114 awaiting defrosting is greater than a temperature threshold, so outdoor unit 114 is determined to be in the first order, and defrosting is controlled on outdoor unit 114. Next, the defrosting order is updated so that outdoor units 20 after outdoor unit 114 are moved up one position in the order; for example, outdoor units 115 and 116 are moved up one position in the order. The updated defrosting order is shown in Table 4 below.

[0091] Table 4. Defrosting sequence of outdoor unit 20 after the update.

[0092]

[0093]

[0094] Among them, outdoor unit 111 awaiting defrosting enters defrosting mode first, followed by outdoor unit 112 awaiting defrosting mode, and so on.

[0095] Please see Figure 4 , Figure 4 This is a schematic diagram of a computer device 30 provided for an embodiment of this application. In one embodiment, the computer device 30 includes a memory 31 and at least one processor 32. Those skilled in the art should understand that... Figure 4 The structure of the computer device 30 shown does not constitute a limitation on the embodiments of this application. The computer device 30 may also include more or fewer other hardware or software, or different component arrangements than shown.

[0096] As an optional implementation, the computer device 30 includes a terminal capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions. Its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), programmable gate arrays (PGAs), digital processors, and embedded devices. As an optional implementation, the memory 31 is used to store computer programs and various data. The memory 31 may include any other computer-readable medium capable of carrying or storing data, such as read-only memory (ROM), random access memory (RAM), or programmable read-only memory (PROM).

[0097] As an optional implementation, at least one processor 32 may include integrated circuits, such as a single-packaged integrated circuit or multiple integrated circuits in packages with the same or different functions, including combinations of microprocessors, digital processing chips, graphics processors, and various control chips. At least one processor 32 is the control core of the computer device 30, executing programs or modules stored in the memory 31 and calling data stored in the memory 31 to perform various functions of the computer device 30 and process data. The memory 31 stores computer programs, and at least one processor 32 can call the computer programs stored in the memory 31 to implement the aforementioned defrosting control method.

[0098] This application also provides a storage medium. The storage medium stores computer instructions, which, when executed on a computing device, cause the computing device to perform the defrosting control method provided in the aforementioned embodiments.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A defrosting control method for an air conditioning unit, characterized in that, The air conditioning unit includes multiple outdoor units to be defrosted, and the method includes: When multiple outdoor units in the air conditioning unit meet the defrosting conditions, the degree of frost on the outdoor units is determined. Based on the degree of frost formation, the multiple outdoor units are sorted to obtain the order in which they enter the defrosting process. The thinner the frost on the outdoor unit, the earlier it enters the defrosting process. Control all outdoor units to enter defrost in the specified order, so that the outdoor units with thinner frost layers complete defrosting first.

2. The defrosting control method according to claim 1, characterized in that, When multiple outdoor units in the air conditioning unit meet the defrosting conditions, the method further includes: Obtain the defrosting time, defrosting interval, and frost thickness for multiple outdoor units; Then, the degree of frost on the outdoor unit is determined as follows: The degree of frost on the outdoor unit is determined based on the defrosting waiting time, the defrosting interval, and the frost thickness.

3. The defrosting control method according to claim 2, characterized in that, The step of sorting the multiple outdoor units to obtain the order in which they enter defrosting includes: Determine a first weighting coefficient for the waiting time for defrosting, a second weighting coefficient for the defrosting interval, and a third weighting coefficient for the frost thickness; The first product is obtained based on the waiting time for defrosting and the first weighting coefficient; The second product is obtained based on the defrosting interval and the second weighting coefficient; The third product is obtained based on the frost layer thickness and the third weighting coefficient; The frost severity value of each outdoor unit is obtained by summing the first product, the second product, and the third product. The frost severity values ​​are sorted in ascending order to determine the order in which they enter the defrosting process. The smaller the frost severity value of the outdoor unit, the earlier it enters the defrosting process.

4. The defrosting control method according to claim 3, characterized in that, include: The sum of the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient is 1.

5. The defrosting control method according to claim 3, characterized in that, After obtaining the order of entering the defrost process, the process also includes: If multiple outdoor units exist in the current sequence, control multiple outdoor units to enter defrosting mode.

6. The defrosting control method according to claim 1, characterized in that, The control of all outdoor units to enter defrost mode in the specified sequence also includes: Obtain the discharge temperature of the compressor for all the outdoor units; If the exhaust temperature is greater than the temperature threshold, the outdoor unit is determined to be the first to enter the defrost sequence, the first outdoor unit is controlled to enter the defrost sequence, and the order of entering the defrost sequence is updated.

7. The defrosting control method according to claim 1, characterized in that, The control of all outdoor units to enter defrost mode in the specified sequence includes: The outdoor units enter defrosting according to the target number specified in the order stated.

8. An air conditioning unit, characterized in that, The air conditioning unit includes a controller and multiple outdoor units to be defrosted, wherein the controller is used to perform the defrosting control method as described in any one of claims 1-7.

9. A computer device, characterized in that, include: A processor is used to execute computer programs; A computer-readable storage medium storing a computer program, which, when executed by the processor, performs the defrosting control method as described in any one of claims 1-7.

10. A storage medium, characterized in that, include: The storage medium stores computer instructions that, when executed on a computing device, enable the computing device to perform the defrosting control method as described in any one of claims 1-7.

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