A heat pump defrosting control method, device, equipment and storage medium

Abstract

The application belongs to the technical field of electrical appliances, and particularly relates to a heat pump defrosting control method, device, equipment and storage medium. The application comprises the following steps: detecting the surface temperature of a heat pump evaporator, and detecting the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located; determining the defrosting duration according to the ambient temperature and relative humidity; when the cumulative running duration of the compressor reaches the defrosting duration and the surface temperature of the evaporator meets the preset temperature condition, controlling the heat pump to perform a defrosting program on the evaporator. The defrosting duration is determined according to the ambient temperature and relative humidity, and the heat pump is controlled to perform a defrosting program on the evaporator only when the cumulative running duration of the compressor reaches the defrosting duration and the surface temperature of the evaporator meets the preset temperature condition, so that the influence of the ambient temperature and relative humidity on the frosting state of the evaporator is considered, the frosting state of the evaporator is relatively uniform during defrosting, the situations of defrosting without frost and defrosting with shallow frost are avoided, and the energy efficiency of the heat pump is improved.

Description

Technical Field

[0001] This application belongs to the field of electrical technology, specifically relating to a heat pump defrosting control method, device, equipment, and storage medium. Background Technology

[0002] Frost will form when the surface temperature of the evaporator coil of a heat pump is simultaneously lower than both the air dew point and freezing point. In actual operation, heat pumps inevitably undergo frosting and defrosting, which in turn inevitably results in heat loss, thus reducing the heat pump's energy efficiency.

[0003] Most existing heat pump defrosting methods use temperature-time control, that is, when the surface temperature of the evaporator coil is lower than a certain set value, the heat pump unit controller starts recording the running time, and when the running time reaches a certain set value, the unit defrosts.

[0004] The drawback of the above method is that it only considers the influence of the evaporator surface temperature and the heat pump unit's operating time on evaporator frosting. This results in inconsistent evaporator frosting conditions when the defrosting conditions of the above method are met, leading to situations such as defrosting without frost or defrosting with shallow frost, which reduces the energy efficiency of the heat pump. Summary of the Invention

[0005] This application provides a heat pump defrosting control method, apparatus, equipment, and storage medium to solve the problem that in the prior art, only the surface temperature of the evaporator and the running time of the heat pump unit are considered to affect the evaporator frosting, which leads to inconsistent frosting state of the evaporator when the defrosting conditions are met, resulting in situations such as defrosting without frost or defrosting with shallow frost, thus reducing the energy efficiency of the heat pump.

[0006] In a first aspect, this application provides a heat pump defrosting control method, the method comprising:

[0007] The surface temperature of the heat pump evaporator is detected, as well as the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0008] The defrosting time is determined based on the ambient temperature and relative humidity.

[0009] When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

[0010] In the preferred embodiment of the heat pump defrosting control method described above, determining the defrosting duration based on the ambient temperature and the relative humidity includes:

[0011] The ambient temperature range within which the ambient temperature falls is determined based on the ambient temperature.

[0012] The defrosting duration is determined based on the ambient temperature range and the relative humidity.

[0013] In the preferred embodiment of the above-mentioned heat pump defrosting control method, the defrosting duration is determined based on the ambient temperature range and the relative humidity, including:

[0014] If the ambient temperature is within the defrosting ambient temperature range, then the higher the relative humidity, the shorter the defrosting time.

[0015] In the preferred embodiment of the above-mentioned heat pump defrosting control method, detecting the surface temperature of the heat pump evaporator includes:

[0016] If the surface temperature of the heat pump evaporator is less than or equal to a first preset temperature threshold, then the duration of the low temperature of the heat pump evaporator is recorded. The duration of the low temperature is the duration during which the surface temperature of the heat pump evaporator is less than or equal to the preset temperature threshold.

[0017] In the preferred embodiment of the above-mentioned heat pump defrosting control method, the evaporator surface temperature meets a preset temperature condition, including:

[0018] The duration of the low temperature reaches the first low temperature duration threshold.

[0019] In a preferred embodiment of the above-mentioned heat pump defrosting control method, before detecting the surface temperature of the heat pump evaporator, and before detecting the cumulative running time of the heat pump compressor, the ambient temperature and relative humidity of the environment where the heat pump outdoor unit is located, the method further includes:

[0020] After the heat pump is powered on for the first time, the cumulative running time of the heat pump compressor is recorded, and the surface temperature of the heat pump evaporator is detected.

[0021] When the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, the heat pump is controlled to perform a defrosting procedure on the evaporator, and the cumulative running time of the heat pump compressor is reset to zero.

[0022] In the preferred embodiment of the above-mentioned heat pump defrosting control method, the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, including:

[0023] The cumulative running time of the heat pump compressor reaches the fifth preset duration, and the duration during which the surface temperature of the heat pump evaporator is below the second preset temperature threshold reaches the second low temperature duration threshold.

[0024] Secondly, this application provides a heat pump defrosting control device, the device comprising:

[0025] An evaporator temperature detection module is used to detect the surface temperature of the heat pump evaporator;

[0026] An ambient temperature and humidity detection module is used to detect the ambient temperature and relative humidity of the environment where the outdoor unit of the heat pump is located;

[0027] The cumulative runtime recording module is used to record the cumulative runtime of the heat pump compressor;

[0028] The control module is used for:

[0029] The defrosting time is determined based on the ambient temperature and relative humidity.

[0030] When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

[0031] Thirdly, this application provides a heat pump defrosting control device, the device comprising:

[0032] Processor, memory, interface;

[0033] The memory is used to store programs and data, and the processor calls the programs stored in the memory to execute the heat pump defrosting control method as described above.

[0034] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the heat pump defrosting control method as described above.

[0035] This application provides a heat pump defrosting control method, device, equipment, and storage medium. The defrosting time is determined based on the ambient temperature and relative humidity. The heat pump is controlled to execute the defrosting program on the evaporator only when the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition. The influence of ambient temperature and relative humidity on the frost state of the evaporator is taken into account, so that the frost state of the evaporator is more uniform during defrosting, avoiding defrosting without frost or defrosting with shallow frost, thereby improving the energy efficiency of the heat pump. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] Figure 1 This is a flowchart of a heat pump defrosting control method provided in an embodiment of this application;

[0038] Figure 2 This is a flowchart of a method for determining defrosting time based on ambient temperature and relative humidity, provided in an embodiment of this application.

[0039] Figure 3 This is a flowchart of another heat pump defrosting control method provided in this application;

[0040] Figure 4 This is a schematic diagram of a heat pump defrosting control device provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of a heat pump defrosting control device provided in an embodiment of this application.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0045] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0046] During operation, the evaporator surface temperature of a heat pump compressor is low. When the surface temperature of the evaporator coil is simultaneously lower than both the air dew point and freezing point, frost will form. Evaporator frost reduces airflow and heat exchange efficiency, thereby decreasing the operating efficiency of the heat pump. Therefore, defrosting is necessary for the heat pump.

[0047] As described in the background section, existing defrosting control methods for heat pumps, such as air-source heat pumps, only consider the impact of evaporator surface temperature and heat pump unit operating time on evaporator frosting. Specifically, when the evaporator coil surface temperature falls below a certain set value, the heat pump unit controller starts recording operating time; when the operating time reaches a certain set value, the unit begins defrosting. However, the rate of frosting on the heat pump evaporator surface is not solely dependent on the evaporator surface temperature. This leads to inconsistent frosting conditions when defrosting is achieved, resulting in situations where defrosting occurs without frost or with only shallow frost, thus reducing the heat pump's energy efficiency.

[0048] To solve the above-mentioned technical problems, the technical concept of this application is: to determine the defrosting time based on the ambient temperature and relative humidity of the environment where the evaporator is located, and to control the heat pump to perform a defrosting program on the evaporator when the cumulative running time of the compressor reaches the defrosting time and the evaporator temperature meets the preset temperature conditions.

[0049] The technical concept of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0050] In one possible embodiment of this application, a heat pump defrosting control method is provided, which can be applied to the control unit of a heat pump, particularly the control unit of a split-type air source heat pump. Figure 1 This is a flowchart of a heat pump defrosting control method provided in an embodiment of this application, as shown below. Figure 1 As shown, the method includes:

[0051] S101. Detect the surface temperature of the heat pump evaporator, and detect the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0052] The surface temperature of the evaporator can be detected by a temperature sensor, and the ambient temperature and relative humidity can be detected by a temperature and humidity sensor located on one side of the evaporator. If the evaporator is placed outdoors, the weather forecast of the outdoor environment can also be obtained through the Internet, thereby obtaining the ambient temperature and relative humidity of the environment where the heat pump evaporator is located.

[0053] Optionally, detecting the surface temperature of the heat pump evaporator includes:

[0054] If the surface temperature of the heat pump evaporator is less than or equal to a first preset temperature threshold, the duration of the low temperature is recorded. This low temperature duration is the duration during which the surface temperature of the heat pump evaporator remains below or equal to the preset temperature threshold. The first preset temperature threshold is lower than the air dew point and freezing point. When the surface temperature of the heat pump evaporator is less than or equal to the first preset temperature threshold, frost may form on the evaporator surface. In this embodiment, the first preset temperature threshold can be -2°C.

[0055] S102. Determine the defrosting duration based on ambient temperature and relative humidity;

[0056] According to the inventor's experiments, ambient temperature and relative humidity affect the frosting rate on the surface of the heat pump evaporator, and are not solely related to the evaporator surface temperature.

[0057] ①According to actual test data, when the ambient temperature is >5℃, frost formation can be disregarded;

[0058] ② When the relative humidity is >75% and the ambient temperature is ≤5℃, the time required for the frost to reach the necessary defrosting level (significant degradation of unit performance) is linearly related to the ambient temperature. The lower the ambient temperature, the less time is required.

[0059] ③ When the relative humidity is 50% ≤ 75% and the ambient temperature is ≤ 5℃, the time required for the frost to reach the necessary defrosting level (significant degradation of unit performance) is less than the time required when the relative humidity is > 75%, and the unit's operating efficiency is improved under a 1 hour and 50 minutes defrosting interval.

[0060] ④ When the relative humidity is <50%, the unit does not frost or always has only a light frost at all ambient temperatures, so there is no need to defrost.

[0061] Different heat pump models may have varying frost thicknesses on the evaporator surface during defrosting, thus affecting the defrost thickness required by their respective defrost programs. For a specific heat pump model, after determining the defrost thickness for its defrost program, the correlation between different ambient temperatures, relative humidity levels, and defrost duration can be calculated or experimentally determined. This ensures that when the compressor's cumulative running time reaches the required defrost duration, the frost thickness on the evaporator surface precisely reaches the defrost thickness specified in the program. Furthermore, this correlation between different ambient temperatures, relative humidity levels, and defrost durations can be pre-stored in the storage unit. When the heat pump detects the ambient temperature and relative humidity of the evaporator's environment, the corresponding defrost time can be obtained.

[0062] S103. When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, control the heat pump to perform the defrosting program on the evaporator.

[0063] Optionally, the evaporator surface temperature meets preset temperature conditions, including:

[0064] The low-temperature duration reaches the first low-temperature duration threshold. When the evaporator surface temperature remains below the first preset temperature threshold for a duration exceeding the first low-temperature duration threshold, and the compressor's cumulative operating time reaches the defrosting duration for the current ambient temperature and relative humidity, the frost thickness on the evaporator surface reaches the defrosting thickness of the heat pump defrosting program. At this point, the heat pump is controlled to execute the defrosting program on the evaporator. The first low-temperature duration threshold can be 1 minute.

[0065] The technical effect of this embodiment is that the defrosting time is determined according to the ambient temperature and relative humidity. When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature conditions, the frost thickness on the evaporator surface reaches the defrosting thickness of the heat pump defrosting program. At this time, the execution of the defrosting program can avoid the situation of defrosting without frost or defrosting with shallow frost, thereby improving the energy efficiency of the heat pump.

[0066] In one possible embodiment of this application, a method for determining the defrosting duration based on ambient temperature and relative humidity is provided. Figure 2 This is a flowchart illustrating a method for determining defrosting time based on ambient temperature and relative humidity, as provided in an embodiment of this application. Figure 2 As shown, the method includes:

[0067] S201. Determine the ambient temperature range based on the ambient temperature.

[0068] S202. Determine the defrosting duration based on the ambient temperature range and relative humidity.

[0069] Optionally, if the ambient temperature is within the defrosting temperature range, the higher the relative humidity, the shorter the defrosting time.

[0070] In this embodiment, the defrosting ambient temperature range can be:

[0071] First defrosting ambient temperature range: First ambient temperature threshold ≤ T ≤ Second ambient temperature threshold;

[0072] Second defrosting ambient temperature range: T < first ambient temperature threshold or T > second ambient temperature threshold;

[0073] In this embodiment, T represents the ambient temperature. Under the same relative humidity, the defrosting time corresponding to the first defrosting ambient temperature range is shorter than the defrosting time corresponding to the second defrosting ambient temperature range. The first ambient temperature threshold can be -4℃, and the second ambient temperature threshold can be 3℃. The correspondence between the defrosting ambient temperature range, relative humidity, and defrosting time can be, for example:

[0074] If the ambient temperature is -4℃≤T≤3℃ and the relative humidity is ≥70%, the defrosting time is 40 minutes.

[0075] If the ambient temperature is -4℃≤T≤3℃ and the relative humidity is <70%, the defrosting time is 90 minutes.

[0076] If the ambient temperature T < -4℃ or T > 3℃, and the relative humidity ≥ 70%, the defrosting time is 90 minutes.

[0077] If the ambient temperature T < -4℃ or T > 3℃ and the relative humidity < 70%, the defrosting time is 120 minutes.

[0078] In practice, the correspondence between the above-mentioned defrosting ambient temperature range, relative humidity, and defrosting time can be pre-stored in the storage unit. After detecting the ambient temperature and relative humidity of the environment where the evaporator is located, the defrosting time can be determined according to the defrosting ambient temperature range and relative humidity range in which the ambient temperature is located.

[0079] In one possible embodiment of this application, another heat pump defrosting control method is provided. Figure 3 This is a flowchart of another heat pump defrosting control method provided in this application, such as... Figure 3 As shown, the method includes:

[0080] S301. After the heat pump is powered on for the first time, record the cumulative running time of the heat pump compressor and detect the surface temperature of the heat pump evaporator.

[0081] S302. When the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, control the heat pump to perform a defrosting program on the evaporator and reset the cumulative running time of the heat pump compressor to zero.

[0082] Optionally, the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet preset defrosting conditions, including:

[0083] The heat pump compressor's cumulative running time reaches a fifth preset duration, and the duration during which the heat pump evaporator surface temperature remains below a second preset temperature threshold reaches a second low-temperature duration threshold. In this embodiment, the fifth preset duration can be 30 minutes, the second preset temperature threshold can be -2°C, and the second low-temperature duration threshold can be 1 minute.

[0084] S303, Detect the surface temperature of the heat pump evaporator, and detect the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0085] S304. Determine the defrosting time based on ambient temperature and relative humidity;

[0086] S305. When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, control the heat pump to perform a defrosting program on the evaporator.

[0087] It should be noted that the cumulative operating time of the compressor in S305 is the cumulative operating time of the compressor after the cumulative operating time of the heat pump compressor is cleared to zero in step S302.

[0088] In one possible embodiment of this application, a heat pump defrosting control device is provided. Figure 4 This is a schematic diagram of a heat pump defrosting control device provided in an embodiment of this application, as shown below. Figure 4 As shown, the device 40 includes: an evaporator temperature detection module 401, an ambient temperature and humidity detection module 402, a cumulative running time recording module 403, and a control module 404;

[0089] Evaporator temperature detection module 401 is used to detect the surface temperature of the heat pump evaporator;

[0090] The ambient temperature and humidity detection module 402 is used to detect the ambient temperature and relative humidity of the environment where the outdoor unit of the heat pump is located.

[0091] The cumulative runtime recording module 403 is used to record the cumulative runtime of the heat pump compressor;

[0092] Control module 404 is used for:

[0093] Determine the defrosting time based on the ambient temperature and relative humidity;

[0094] When the compressor's cumulative running time reaches the defrosting time and the evaporator surface temperature meets the preset temperature condition, the heat pump is controlled to perform a defrosting program on the evaporator.

[0095] In one possible embodiment of this application, a heat pump defrosting control device is provided. Figure 5 This is a schematic diagram of a heat pump defrosting control device provided in an embodiment of this application, as shown below. Figure 5 As shown, the device 50 includes: a memory 501, a processor 502, and an interface 503, which are connected via a bus 504.

[0096] The memory 501 is used to store programs and data. The processor 502 calls the program stored in the memory 501 to execute the heat pump defrosting control method as described above.

[0097] The specific implementation process of processor 502 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0098] In the above Figure 5In the illustrated embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0099] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0100] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a specific type of bus.

[0101] In one possible embodiment of this application, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the heat pump defrosting control method as described above.

[0102] The aforementioned computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0103] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0104] The division of units described herein is merely a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0105] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0106] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0107] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0109] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat pump defrosting control method, characterized in that, The method includes: The surface temperature of the heat pump evaporator is detected, as well as the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located; The defrosting time is determined based on the ambient temperature and relative humidity. When the cumulative running time of the heat pump compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator. Before detecting the surface temperature of the heat pump evaporator, and before detecting the cumulative operating time of the heat pump compressor, the ambient temperature and relative humidity of the environment where the heat pump outdoor unit is located, the method further includes: After the heat pump is powered on for the first time, the cumulative running time of the heat pump compressor is recorded, and the surface temperature of the heat pump evaporator is detected. When the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, the heat pump is controlled to perform a defrosting procedure on the evaporator, and the cumulative running time of the heat pump compressor is reset to zero. The cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, including: The cumulative running time of the heat pump compressor reaches the fifth preset duration, and the duration during which the surface temperature of the heat pump evaporator is below the second preset temperature threshold reaches the second low temperature duration threshold.

2. The method according to claim 1, characterized in that, Determining the defrosting duration based on the ambient temperature and relative humidity includes: The ambient temperature range within which the ambient temperature falls is determined based on the ambient temperature. The defrosting duration is determined based on the ambient temperature range and the relative humidity.

3. The method according to claim 2, characterized in that, The defrosting duration is determined based on the ambient temperature range and the relative humidity, including: If the ambient temperature is within the defrosting ambient temperature range, then the higher the relative humidity, the shorter the defrosting time.

4. The method according to claim 1, characterized in that, The detection of the surface temperature of the heat pump evaporator includes: If the surface temperature of the heat pump evaporator is less than or equal to a first preset temperature threshold, then the duration of the low temperature of the heat pump evaporator is recorded. The duration of the low temperature is the duration during which the surface temperature of the heat pump evaporator is less than or equal to the preset temperature threshold.

5. The method according to claim 4, characterized in that, The evaporator surface temperature meets preset temperature conditions, including: The duration of the low temperature reaches the first low temperature duration threshold.

6. A heat pump defrosting control device, characterized in that, The device includes: An evaporator temperature detection module is used to detect the surface temperature of the heat pump evaporator; An ambient temperature and humidity detection module is used to detect the ambient temperature and relative humidity of the environment where the outdoor unit of the heat pump is located; The cumulative runtime recording module is used to record the cumulative runtime of the heat pump compressor; The control module is used for: The defrosting time is determined based on the ambient temperature and relative humidity. When the cumulative running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator. Before detecting the surface temperature of the heat pump evaporator, and before detecting the cumulative operating time of the heat pump compressor, the ambient temperature and relative humidity of the environment where the heat pump outdoor unit is located, the control module is further configured to: After the heat pump is powered on for the first time, the cumulative running time of the heat pump compressor is recorded, and the surface temperature of the heat pump evaporator is detected. When the cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, the heat pump is controlled to perform a defrosting procedure on the evaporator, and the cumulative running time of the heat pump compressor is reset to zero. The cumulative running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, including: The cumulative running time of the heat pump compressor reaches the fifth preset duration, and the duration during which the surface temperature of the heat pump evaporator is below the second preset temperature threshold reaches the second low temperature duration threshold.

7. A heat pump defrosting control device, characterized in that, The device includes: Processor, memory, interface; The memory is used to store programs and data, and the processor calls the programs stored in the memory to execute the heat pump defrosting control method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the heat pump defrosting control method according to any one of claims 1 to 5.

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