Control method and device of air source heat pump unit, storage medium and electronic equipment

Abstract

The invention discloses a control method and device of an air source heat pump unit, a storage medium and electronic equipment, and relates to the technical field of heat pumps, and the method comprises the steps that when the water inlet and outlet temperature difference, the outdoor environment temperature or the evaporation temperature meet the preset first condition, the temperature change value of the water inlet temperature is calculated; according to the temperature change value, whether the heating capacity of the unit meets a preset second condition or not is determined; and if the heating capacity of the unit meets the preset second condition, the air source heat pump unit is controlled to execute a preset defrosting action. The defrosting reliability of the air source heat pump unit can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically to a control method, device, storage medium, and electronic equipment for an air source heat pump unit. Background Technology

[0002] Traditional air-source heat pump units typically rely on detecting a single factor, such as outdoor temperature, and triggering defrost based on whether this single factor meets a specific condition. Following this traditional approach, in hot and humid weather, defrost may not be triggered even when there is significant frost buildup but the temperature hasn't reached its maximum, leading to a severe decline in unit performance. Conversely, in cold and dry weather, defrost may be triggered even when there is no frost or a very thin frost layer, resulting in energy waste and fluctuations in comfort levels. Therefore, traditional air-source heat pump unit defrost strategies suffer from poor defrost reliability. Summary of the Invention

[0003] This application provides a control scheme for an air source heat pump unit, which can effectively improve the defrosting reliability of the air source heat pump unit.

[0004] The embodiments of this application provide the following technical solutions: According to one embodiment of this application, a control method for an air source heat pump unit includes: calculating the temperature change value of the inlet water temperature when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition; determining whether the unit's heating capacity meets a preset second condition based on the temperature change value; and controlling the air source heat pump unit to perform a preset defrosting action if the unit's heating capacity meets the preset second condition.

[0005] In some embodiments of this application, the condition that the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition includes: when the inlet and outlet water temperature difference is less than a temperature difference threshold and the unit operating time is greater than or equal to a preset first duration or the rate of change of the inlet and outlet water temperature difference is greater than a preset rate of change, then the preset first condition is met; or, when the outdoor ambient temperature is less than a preset ambient temperature and the unit operating time is greater than or equal to a preset second duration, then the preset first condition is met; or, when the evaporation temperature is less than a first temperature threshold, then the preset first condition is met.

[0006] In some embodiments of this application, the temperature difference threshold includes: multiplying an initial reference temperature difference by a preset temperature difference correction coefficient to obtain the temperature difference threshold, wherein the initial reference temperature difference is the inlet and outlet water temperature difference when the air source heat pump unit has been running for a predetermined stable operating time; or, determining a preset temperature difference value as the temperature difference threshold.

[0007] In some embodiments of this application, the first temperature threshold includes: subtracting a preset temperature correction value from the outdoor ambient temperature to obtain the first temperature threshold; or, determining the preset temperature value as the first temperature threshold.

[0008] In some embodiments of this application, the temperature change value includes the inlet water temperature difference between adjacent sampling times and the rate of temperature change of the inlet water temperature; determining whether the unit's heating capacity meets the preset second condition based on the temperature change value includes: determining whether the inlet water temperature is less than or equal to a second temperature threshold, the second temperature threshold being equal to a set temperature multiplied by a preset temperature correction coefficient; if the inlet water temperature is less than or equal to the second temperature threshold, then determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference and the rate of temperature change; if the inlet water temperature is greater than the second temperature threshold, then determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference.

[0009] In some embodiments of this application, determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference and the temperature change rate includes: when the inlet water temperature difference is less than zero, determining that the heating capacity of the unit meets the preset second condition; when the inlet water temperature difference is greater than or equal to zero and the temperature change rate is less than a preset rate, determining that the heating capacity of the unit meets the preset second condition.

[0010] In some embodiments of this application, determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference includes: when the inlet water temperature difference is less than zero, determining that the heating capacity of the unit meets the preset second condition.

[0011] According to one embodiment of this application, a control device for an air source heat pump unit includes: a calculation module, configured to: calculate a temperature change value of the inlet water temperature when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition; a determination module, configured to: determine whether the unit's heating capacity meets a preset second condition based on the temperature change value; and an execution module, configured to: control the air source heat pump unit to perform a preset defrosting action if the unit's heating capacity meets the preset second condition.

[0012] According to another embodiment of this application, a storage medium stores a computer program thereon, which, when executed by a processor of an electronic device, causes the electronic device to perform the methods described in the embodiments of this application.

[0013] According to another embodiment of this application, an electronic device may include: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the methods described in the embodiments of this application.

[0014] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0015] In this embodiment of the application, when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meet the preset first condition, the temperature change value of the inlet water temperature is calculated; based on the temperature change value, it is determined whether the heating capacity of the unit meets the preset second condition; if the heating capacity of the unit meets the preset second condition, the air source heat pump unit is controlled to perform a preset defrosting action.

[0016] In this embodiment of the application, when both the preset first condition and the preset second condition are met, that is, when it is determined from the unit's operating status and the user's usage needs that the unit needs to be defrosted, the air source heat pump unit is controlled to perform a preset defrosting action. Compared with the traditional method, a more reasonable defrosting time can be reliably selected for defrosting. This can reliably avoid the situation where defrosting is not triggered when it is needed, and can also reliably avoid the situation where defrosting is ineffective. Overall, it can effectively improve the defrosting reliability of the air source heat pump unit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating a control method for an air source heat pump unit according to an embodiment of this application is shown.

[0019] Figure 2 A control flowchart of an air source heat pump unit according to an embodiment of this application is shown in a defrosting scenario.

[0020] Figure 3 A block diagram of a control device for an air source heat pump unit according to an embodiment of this application is shown.

[0021] Figure 4A block diagram of an electronic device according to an embodiment of this application is shown. Detailed Implementation

[0022] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments provided herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. Furthermore, the embodiments provided below are some embodiments for implementing the present disclosure, and not all embodiments for implementing the present disclosure. Unless otherwise specified, the technical solutions described in the embodiments of the present disclosure can be implemented in any combination.

[0023] It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements (e.g., steps in the method or units in the apparatus; for example, a unit may be a portion of circuitry, a portion of a processor, a portion of a program or software, etc.) in the method or apparatus that includes that element.

[0024] For example, the control method for an air source heat pump unit provided in this disclosure includes a series of steps. However, the control method for an air source heat pump unit provided in this disclosure is not limited to the steps described. Similarly, the control device for an air source heat pump unit provided in this disclosure includes a series of units. However, the device provided in this disclosure is not limited to the units explicitly described, but may also include units that need to be set up to obtain relevant information or to process information.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0026] It is understood that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0027] Traditional air-source heat pump units typically rely on detecting a single factor, such as outdoor temperature, and triggering defrost based on whether this single factor meets a specific condition. Following this traditional approach, in hot and humid weather, defrost may not be triggered even when there is significant frost buildup but the temperature hasn't reached its maximum, leading to a severe decline in unit performance. Conversely, in cold and dry weather, defrost may be triggered even when there is no frost or a very thin frost layer, resulting in energy waste and fluctuations in comfort levels. Therefore, traditional air-source heat pump unit defrost strategies suffer from poor defrost reliability.

[0028] To address these issues, this application provides a control scheme for an air source heat pump unit, which can effectively improve the defrosting reliability of the air source heat pump unit.

[0029] The following describes in detail the relevant embodiments of the control scheme for the air source heat pump unit provided in this application. The air source heat pump unit can be any unit that utilizes air source heat pumps, such as heating units, modular units, water heaters, multi-split systems, etc. The air source heat pump unit may include a compressor, a four-way valve, a condenser (water-side heat exchanger), throttling components (such as an electronic expansion valve), an evaporator, an external ambient temperature sensor, an external coil temperature sensor, an inlet water temperature sensor, and an outlet water temperature sensor, etc.

[0030] Figure 1 A flowchart illustrating a control method for an air source heat pump unit according to an embodiment of this application is shown. The execution entity of this control method can be a control module with processing capabilities. The control module can be installed in electronic devices such as the air source heat pump unit, remote control, wired controller, mobile phone, computer, smartwatch, and other home appliances. The control module may include at least a memory and a processor. In some embodiments, the control module can be installed on a server (such as a cloud server or physical server) for remote control of the air source heat pump unit.

[0031] In one embodiment of this application, the control module, which serves as the execution body of the control method for the air source heat pump unit, is specifically disposed within the air source heat pump unit. The control module may include a processor and a memory, i.e., the air conditioner includes the processor and memory, with the memory storing a computer program. Thus, the processor in the air source heat pump unit can read the computer program stored in the memory to execute the methods of the various embodiments of this application.

[0032] like Figure 1 As shown, the control method of the air source heat pump unit may include steps S110 to S130.

[0033] Step S110: When the inlet and outlet water temperature difference, outdoor ambient temperature or evaporation temperature meet the preset first condition, calculate the temperature change value of the inlet water temperature. Step S120: Determine whether the unit's heating capacity meets the preset second condition based on the temperature change value; Step S130: If the unit's heating capacity meets the preset second condition, then control the air source heat pump unit to perform the preset defrosting action.

[0034] The inlet and outlet water temperature difference ΔT is the difference between the inlet and outlet water temperatures of the air source heat pump unit. The inlet water temperature th is the water temperature at the inlet side of the air source heat pump unit, and the outlet water temperature is the water temperature at the outlet side. The outdoor ambient temperature Tw is the outdoor ambient temperature. The evaporation temperature Tp is the evaporation temperature of the evaporator, specifically referring to the temperature of the external coil of the air source heat pump unit.

[0035] The system continuously monitors the inlet and outlet water temperature difference ΔT, outdoor ambient temperature Tw, and evaporation temperature Tp of the air source heat pump unit. When the inlet and outlet water temperature difference ΔT, outdoor ambient temperature Tw, or evaporation temperature Tp meets the preset first condition (i.e., any one of ΔT, Tw, and Tp meets the preset first condition), the system can preliminarily and accurately determine from the unit's operating status that the unit needs defrosting.

[0036] After the first preset condition is met, the unit's heating capacity is further determined based on the temperature change value of the inlet water temperature th to determine whether the second preset condition is met. The temperature change value of the inlet water temperature th may include the difference in inlet water temperature th between adjacent sampling times and the rate of temperature change of the inlet water temperature th.

[0037] The applicant discovered that the temperature change value of the inlet water temperature th can accurately reflect the degree to which the unit's heating capacity meets the user's needs. Therefore, determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature th can accurately reflect whether the unit's heating capacity can effectively meet the user's needs.

[0038] When the unit's heating capacity meets the preset second condition, it means that the unit's heating capacity cannot effectively meet the user's needs. Further, based on the user's needs, it can be accurately determined that the unit needs to defrost. At this time, the air source heat pump unit can be reliably controlled to perform the preset defrosting action.

[0039] In other words, in this embodiment of the present application, when both the preset first condition and the preset second condition are met, that is, when it is determined from the unit's operating status and the user's usage needs that the unit needs to be defrosted, the air source heat pump unit is controlled to perform a preset defrosting action. Compared with the traditional method, a more reasonable defrosting time can be reliably selected for defrosting. This can reliably avoid the situation where defrosting is not triggered when it is needed, and can also reliably avoid the situation where defrosting is ineffective. Overall, it can effectively improve the defrosting reliability of the air source heat pump unit.

[0040] The following description Figure 1Further optional specific embodiments are provided for the steps performed when controlling an air source heat pump unit as described in the example.

[0041] In one embodiment, step S110, when the inlet and outlet water temperature difference, the outdoor ambient temperature, or the evaporation temperature meets a preset first condition, may include: when the inlet and outlet water temperature difference is less than a temperature difference threshold, and the unit operating time is greater than or equal to a preset first duration or the rate of change of the inlet and outlet water temperature difference is greater than a preset rate of change, then the preset first condition is met; or, when the outdoor ambient temperature is less than a preset ambient temperature, and the unit operating time is greater than or equal to a preset second duration, then the preset first condition is met; or, when the evaporation temperature is less than a first temperature threshold, then the preset first condition is met.

[0042] Specifically, the preset first condition is met when the inlet and outlet water temperature difference ΔT is less than the temperature difference threshold ΔTy, and the unit's operating time is greater than or equal to a preset first duration t1, or the rate of change of the inlet and outlet water temperature difference d(ΔT) / dt is greater than a preset rate of change α. That is, the preset first condition is met when ΔT < ΔTy and t ≥ t1, or when ΔT < ΔTy and d(ΔT) / dt > α. Specifically, when ΔT < ΔTy, it can be determined that the inlet and outlet water temperature difference of the air source heat pump unit has decreased to a level that may be due to worsening frosting; when d(ΔT) / dt > α, the rate of decrease in the inlet and outlet water temperature difference accelerates, indicating worsening frosting in the air source heat pump unit. The unit's operating time is the operating time after the unit is started.

[0043] When the outdoor ambient temperature Tw is less than the preset ambient temperature A, and the unit's operating time t is greater than or equal to the preset second operating time t2, then the preset first condition is met. That is, when Tw < A and t ≥ t2, the preset first condition is also met. Among them, when Tw < A and t ≥ t2, it can be determined that under extreme outdoor ambient temperatures (such as when blizzards or more extreme conditions are likely to occur), the air source heat pump unit's operating time has reached the maximum allowable protection time.

[0044] Furthermore, when the evaporation temperature Tp is less than the first temperature threshold T1, the preset first condition is met. That is, when Tp < T1, the preset first condition is also determined to be met. Among them, when Tp < T1, it can be determined that the evaporation temperature of the air source heat pump unit has reached the minimum temperature for further defrosting judgment.

[0045] Furthermore, in one embodiment, the temperature difference threshold may optionally include: (1) multiplying the initial reference temperature difference with a preset temperature difference correction coefficient to obtain the temperature difference threshold, wherein the initial reference temperature difference is the inlet and outlet water temperature difference when the air source heat pump unit is turned on and reaches a predetermined stable operating time; or, (2) determining the preset temperature difference value as the temperature difference threshold.

[0046] In the first method, when the air source heat pump unit has been running for a predetermined stable operating time (e.g., 10 minutes), the temperature difference between the inlet and outlet water at this time is taken as the initial reference temperature difference ΔT0. This initial reference temperature difference ΔT0 can represent the maximum capacity parameter of the air source heat pump unit under normal operation. The temperature difference threshold ΔTy = ΔT0 * K, where K is the preset temperature difference correction coefficient. According to this method, the temperature difference threshold ΔTy can be dynamically determined based on the initial reference temperature difference ΔT0. Using this temperature difference threshold ΔTy in the embodiments of this application can further improve defrosting reliability. The preset temperature difference correction coefficient can be set according to actual conditions, and this application does not impose any special limitations on it.

[0047] In the second method, a preset temperature difference value is set in advance, and the preset temperature difference value can be directly determined as the temperature difference threshold ΔTy.

[0048] Furthermore, the first temperature threshold may optionally include: (1) subtracting a preset temperature correction value from the outdoor ambient temperature to obtain the first temperature threshold; or, (2) determining the preset temperature value as the first temperature threshold.

[0049] In the method of (1), the first temperature threshold T1 = outdoor ambient temperature Tw - preset temperature correction value B. The first temperature threshold T1 is dynamically determined according to the outdoor ambient temperature Tw in this method. The first temperature threshold T1 used in the embodiments of this application can further improve the defrosting reliability. The preset temperature correction value B can be set according to the actual situation, and this application does not make any special limitation on it.

[0050] In the second method, a preset temperature value is set in advance, and the preset temperature value can be directly determined as the first temperature threshold T1.

[0051] In one embodiment, the temperature change value includes the inlet water temperature difference ΔTh between adjacent sampling times and the inlet water temperature change rate d(ΔTh) / dt; that is, ΔTh is the difference between the inlet water temperature at the next moment and the inlet water temperature at the previous moment. In step S120, determining whether the unit's heating capacity meets the preset second condition based on the temperature change value can specifically include: determining whether the inlet water temperature is less than or equal to a second temperature threshold, the second temperature threshold being equal to a set temperature multiplied by a preset temperature correction coefficient; if the inlet water temperature is less than or equal to the second temperature threshold, then determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference and the temperature change rate; if the inlet water temperature is greater than the second temperature threshold, then determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference.

[0052] Specifically, first determine whether the inlet water temperature th is less than or equal to the second temperature threshold T2, where the second temperature threshold T2 is equal to the set temperature TS multiplied by the preset temperature correction coefficient R. Based on this, it can be determined whether the inlet water temperature th meets part of the user's set temperature TS requirement (i.e., whether it satisfies some user needs). The preset temperature correction coefficient R can be set according to actual conditions, and this application does not impose any special limitations on it.

[0053] If the inlet water temperature th is less than or equal to the second temperature threshold T2, it indicates that the inlet water temperature is too low and does not meet the user's needs. At this point, based on the inlet water temperature difference ΔTh and the temperature change rate d(ΔTh) / dt, it can be accurately determined whether the unit's heating capacity can effectively meet the user's needs, that is, whether the unit's heating capacity meets the preset second condition.

[0054] If the inlet water temperature th is greater than the second temperature threshold T2, it means that the inlet water temperature at this time has met part of the user's set temperature TS (i.e., it has met part of the user's usage needs). Further, based on the inlet water temperature difference ΔTh, it can be accurately determined whether the unit's heating capacity can effectively meet the user's usage needs, that is, whether the unit's heating capacity meets the preset second condition.

[0055] Furthermore, in one embodiment, determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference and the temperature change rate may include: when the inlet water temperature difference is less than zero, determining that the unit's heating capacity meets the preset second condition; when the inlet water temperature difference is greater than or equal to zero and the temperature change rate is less than a preset rate, determining that the unit's heating capacity meets the preset second condition.

[0056] When the inlet water temperature difference ΔTh is less than zero, it indicates that the inlet water temperature is decreasing. Since the inlet water temperature is too low to meet the user's needs, the unit's heating capacity is no longer sufficient to meet the user's needs and defrosting is required immediately. If the unit's heating capacity meets the preset second condition, the air source heat pump unit can be triggered to perform the preset defrosting action.

[0057] When the inlet water temperature difference ΔTh is greater than or equal to zero, it indicates that the inlet water temperature is rising. However, if the rate of temperature change d(ΔTh) / dt is less than the preset rate β, it means that the rate of increase of the inlet water temperature has reached β. At this time, the unit has no actual heating effect, and the unit's heating capacity can no longer effectively meet the user's needs. Defrosting is required immediately. If the unit's heating capacity meets the preset second condition, the air source heat pump unit can be triggered to perform the preset defrosting action.

[0058] Furthermore, in one embodiment, determining whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference includes: when the inlet water temperature difference is less than zero, determining that the unit's heating capacity meets the preset second condition.

[0059] When the inlet water temperature difference ΔTh is less than zero, it indicates that the inlet water temperature is decreasing. At this time, although the inlet water temperature has reached part of the user's set temperature TS (i.e., it has met part of the user's needs), the unit's heating capacity can no longer effectively meet the user's needs, and defrosting is required immediately. If the unit's heating capacity meets the preset second condition, the air source heat pump unit can be triggered to perform the preset defrosting action.

[0060] Furthermore, in the aforementioned embodiments of this application, the preset defrosting action may specifically include: the four-way valve being energized and reversing, the throttling component being fully opened to reduce the throttling effect, and the compressor operating at a preset defrosting frequency. Additionally, the defrosting mode may be exited when the evaporation temperature reaches the outer disk temperature value TP1 for exiting defrosting, or when the actual defrosting time (i.e., the time after executing the preset defrosting action) reaches the preset defrosting time t3.

[0061] To facilitate better implementation of the control method for the air source heat pump unit provided in the embodiments of this application, the above embodiments are further described below with reference to a defrosting scenario. This defrosting scenario uses the aforementioned embodiments of this application to control the air source heat pump unit. The meanings of the terms used are the same as in the control method for the air source heat pump unit described above, and specific implementation details can be found in the description of the method embodiments. For example, Figure 2 The control flowchart of the air source heat pump unit in this defrosting scenario is shown.

[0062] See Figure 2 The control process of the air source heat pump unit in this defrosting scenario may include steps S210 to S240.

[0063] Step S210: When the air source heat pump unit has been running for a preset defrost judgment time t0, the defrost judgment begins. The preset defrost judgment time t0 is the maximum running time before entering the defrost judgment stage.

[0064] In addition, before the air source heat pump unit has been running for the preset defrosting time t0, when the air source heat pump unit has been running for the preset stable running time (e.g., 10 min), the inlet and outlet water temperature difference at this time is taken as the initial reference temperature difference ΔT0.

[0065] Step S220: Determine whether the inlet / outlet water temperature difference ΔT, the outdoor ambient temperature Tw, or the evaporation temperature Tp meets the preset first condition. Wherein, for example... Figure 2 As shown, step S220 may include steps S221 to S226.

[0066] Step S221: Determine if ΔT < ΔTy; Step S222: Determine if t ≥ t1; Step S223: Determine if d(ΔT) / dt > α; Step S224: Determine if Tw < A and t ≥ t2; Step S225: Determine if Tp < T1.

[0067] Step S226: If any of the aforementioned conditions are met, then the preset first condition is determined to be satisfied. Specifically, when ΔT < ΔTy and t ≥ t1, or when ΔT < ΔTy and d(ΔT) / dt > α, the preset first condition is determined to be satisfied. Alternatively, when Tw < A and t ≥ t2, the preset first condition is also determined to be satisfied. Alternatively, when Tp < T1, the preset first condition is also determined to be satisfied.

[0068] Step S230: Based on the temperature change value, determine whether the unit's heating capacity meets the preset second condition. Step S230 may specifically include steps S231 to S234 to determine whether the unit's heating capacity meets the preset second condition.

[0069] Step S231: Determine if th ≤ T2, where T2 = TS * R; if yes, proceed to steps S232 and S233; if no, proceed to step S234. Step S232: Determine if ΔTh < 0; Step S233: Determine if ΔTh ≥ 0 and d(ΔTh) / dt < β; Step S234: Determine if ΔTh < 0. Wherein, when th ≤ T2 and ΔTh < 0, the unit's heating capacity meets the preset second condition; when th ≤ T2, ΔTh ≥ 0 and d(ΔTh) / dt < β, the unit's heating capacity meets the preset second condition; when th > T2 and ΔTh < 0, the unit's heating capacity meets the preset second condition.

[0070] Step S240: When it is determined that the heating capacity of the unit meets the preset second condition, the air source heat pump unit is controlled to perform the preset defrosting action.

[0071] In this scenario, by applying the aforementioned embodiments of this application, when both the preset first condition and the preset second condition are met, that is, when it is determined from the unit's operating status and user needs that the unit needs defrosting, the air source heat pump unit is controlled to perform a preset defrosting action. Compared with the traditional method, a more reasonable defrosting time can be reliably selected for defrosting. This can reliably avoid the situation where defrosting is not triggered when it is needed, and can also reliably avoid the situation where defrosting is ineffective. Overall, it can effectively improve the defrosting reliability of the air source heat pump unit.

[0072] To facilitate better implementation of the control method for air source heat pump units provided in the embodiments of this application, the embodiments of this application also provide a control device for air source heat pump units based on the above-described control method. The meanings of the terms used are the same as in the control method for air source heat pump units described above, and specific implementation details can be found in the descriptions in the method embodiments. Figure 3 A block diagram of a control device for an air source heat pump unit according to an embodiment of this application is shown.

[0073] like Figure 3 As shown, the control device 300 of the air source heat pump unit may include: a calculation module 310, which can be used to calculate the temperature change value of the inlet water temperature when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition; a determination module 320, which can be used to determine whether the heating capacity of the unit meets a preset second condition based on the temperature change value; and an execution module 330, which can be used to control the air source heat pump unit to perform a preset defrosting action if the heating capacity of the unit meets the preset second condition.

[0074] In some embodiments of this application, when the inlet / outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition, the calculation module 310 can be used to: satisfy the preset first condition when the inlet / outlet water temperature difference is less than a temperature difference threshold and the unit operating time is greater than or equal to a preset first duration or the rate of change of the inlet / outlet water temperature difference is greater than a preset rate of change; or, satisfy the preset first condition when the outdoor ambient temperature is less than a preset ambient temperature and the unit operating time is greater than or equal to a preset second duration; or, satisfy the preset first condition when the evaporation temperature is less than a first temperature threshold.

[0075] In some embodiments of this application, the calculation module 310 may be used to: multiply the initial reference temperature difference by a preset temperature difference correction coefficient to obtain the temperature difference threshold, wherein the initial reference temperature difference is the inlet and outlet water temperature difference when the air source heat pump unit is turned on and reaches a predetermined stable operating time; or, determine the preset temperature difference value as the temperature difference threshold.

[0076] In some embodiments of this application, the calculation module 310 may be used to: subtract a preset temperature correction value from the outdoor ambient temperature to obtain the first temperature threshold; or, determine the preset temperature value as the first temperature threshold.

[0077] In some embodiments of this application, the temperature change value includes the inlet water temperature difference between adjacent sampling times and the rate of temperature change of the inlet water temperature; when determining whether the unit's heating capacity meets the preset second condition based on the temperature change value, the determining module 320 can be used to: determine whether the inlet water temperature is less than or equal to a second temperature threshold, the second temperature threshold being equal to a set temperature multiplied by a preset temperature correction coefficient; if the inlet water temperature is less than or equal to the second temperature threshold, then determine whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference and the rate of temperature change; if the inlet water temperature is greater than the second temperature threshold, then determine whether the unit's heating capacity meets the preset second condition based on the inlet water temperature difference.

[0078] In some embodiments of this application, when determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference and the temperature change rate, the determining module 320 can be used to: determine that the heating capacity of the unit meets the preset second condition when the inlet water temperature difference is less than zero; and determine that the heating capacity of the unit meets the preset second condition when the inlet water temperature difference is greater than or equal to zero and the temperature change rate is less than a preset rate.

[0079] In some embodiments of this application, when determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference, the determining module 320 can be used to: determine that the heating capacity of the unit meets the preset second condition when the inlet water temperature difference is less than zero.

[0080] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0081] Furthermore, embodiments of this application also provide an electronic device, such as... Figure 4 As shown, Figure 4 A block diagram of an electronic device according to an embodiment of this application is shown, specifically: The electronic device may include components such as a processor 401 with one or more processing cores, a memory 402 with one or more computer-readable storage media, a power supply 403, and an input unit 404. Those skilled in the art will understand that... Figure 4The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein: The processor 401 is the control center of the electronic device, connecting various parts of the computer device via various interfaces and lines. It executes software programs and / or modules stored in the memory 402, and calls data stored in the memory 402, to perform various functions and process data. Optionally, the processor 401 may include one or more processing cores; preferably, the processor 401 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user page, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 401.

[0082] The memory 402 can be used to store software programs and modules. The processor 401 executes various functional applications and data processing by running the software programs and modules stored in the memory 402. The memory 402 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 402 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 402 may also include a memory controller to provide the processor 401 with access to the memory 402.

[0083] The electronic device also includes a power supply 403 that supplies power to the various components. Preferably, the power supply 403 can be logically connected to the processor 401 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 403 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0084] The electronic device may also include an input unit 404, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0085] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 401 in the electronic device can load the executable files corresponding to the processes of one or more computer programs into the memory 402 according to the following instructions, and the processor 401 runs the computer programs stored in the memory 402, thereby realizing the various functions in the foregoing embodiments of this application.

[0086] For example, processor 401 can perform the following: when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition, calculate the temperature change value of the inlet water temperature; based on the temperature change value, determine whether the unit's heating capacity meets a preset second condition; if the unit's heating capacity meets the preset second condition, control the air source heat pump unit to perform a preset defrosting action.

[0087] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a computer program, or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0088] Therefore, embodiments of this application also provide a storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the methods provided in embodiments of this application.

[0089] The storage medium can be a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0090] Since the computer program stored in the storage medium can execute the steps of any of the methods provided in the embodiments of this application, the beneficial effects that the methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0091] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0092] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0093] It should be understood that this application is not limited to the embodiments described above and shown in the accompanying drawings, but various modifications and changes can be made without departing from its scope.

Claims

1. A control method for an air source heat pump unit, characterized in that, include: When the inlet and outlet water temperature difference, outdoor ambient temperature or evaporation temperature meet the preset first condition, calculate the temperature change value of the inlet water temperature. Based on the temperature change value, determine whether the unit's heating capacity meets the preset second condition; If the heating capacity of the unit meets the preset second condition, then the air source heat pump unit is controlled to perform a preset defrosting action.

2. The method according to claim 1, characterized in that, The condition that the inlet / outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meets a preset first condition includes: When the inlet and outlet water temperature difference is less than the temperature difference threshold, and the unit operating time is greater than or equal to the preset first time or the temperature difference change rate of the inlet and outlet water is greater than the preset change rate, then the preset first condition is met. Alternatively, if the outdoor ambient temperature is lower than the preset ambient temperature and the unit's operating time is greater than or equal to the preset second duration, then the preset first condition is met. Alternatively, if the evaporation temperature is less than the first temperature threshold, then the preset first condition is met.

3. The method according to claim 2, characterized in that, The temperature difference threshold includes: The initial reference temperature difference is multiplied by a preset temperature difference correction coefficient to obtain the temperature difference threshold, wherein the initial reference temperature difference is the inlet and outlet water temperature difference when the air source heat pump unit has been running for a predetermined stable operating time. Alternatively, a preset temperature difference value can be determined as the temperature difference threshold.

4. The method according to claim 2, characterized in that, The first temperature threshold includes: The first temperature threshold is obtained by subtracting a preset temperature correction value from the outdoor ambient temperature. Alternatively, the preset temperature value can be determined as the first temperature threshold.

5. The method according to claim 1, characterized in that, The temperature change value includes the difference in inlet water temperature between adjacent sampling times and the rate of temperature change of the inlet water temperature; The step of determining whether the unit's heating capacity meets the preset second condition based on the temperature change value includes: Determine whether the inlet water temperature is less than or equal to a second temperature threshold, wherein the second temperature threshold is equal to the set temperature multiplied by a preset temperature correction coefficient; If the inlet water temperature is less than or equal to the second temperature threshold, then based on the inlet water temperature difference and the temperature change rate, it is determined whether the unit's heating capacity meets the preset second condition. If the inlet water temperature is greater than the second temperature threshold, then the heating capacity of the unit is determined to meet the preset second condition based on the inlet water temperature difference.

6. The method according to claim 5, characterized in that, The step of determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference and the temperature change rate includes: When the inlet water temperature difference is less than zero, it is determined that the heating capacity of the unit meets the preset second condition; If the inlet water temperature difference is greater than or equal to zero and the temperature change rate is less than a preset rate, then the heating capacity of the unit is determined to meet the preset second condition.

7. The method according to claim 5, characterized in that, The step of determining whether the heating capacity of the unit meets the preset second condition based on the inlet water temperature difference includes: If the inlet water temperature difference is less than zero, then the heating capacity of the unit is determined to meet the preset second condition.

8. A control device for an air source heat pump unit, characterized in that, include: The calculation module is used to calculate the temperature change value of the inlet water temperature when the inlet and outlet water temperature difference, outdoor ambient temperature, or evaporation temperature meet the preset first condition. The determination module is used to: determine whether the heating capacity of the unit meets the preset second condition based on the temperature change value; The execution module is used to: if the heating capacity of the unit meets the preset second condition, control the air source heat pump unit to perform a preset defrosting action.

9. A storage medium, characterized in that, It stores a computer program that, when executed by the processor of the electronic device, causes the electronic device to perform the method described in any one of claims 1 to 7.

10. An electronic device, characterized in that, include: Memory, which stores computer programs; A processor reads a computer program stored in memory to perform the method described in any one of claims 1 to 7.

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