Air conditioner and cleaning control method thereof

Abstract

The application provides a cleaning control method of an air conditioner and the air conditioner. The method comprises the following steps: obtaining a heat exchange amount of a heat exchanger within a first preset working time length; determining a dirt growth coefficient of the heat exchanger according to the heat exchange amount; and determining whether the heat exchanger needs to be cleaned according to the dirt growth coefficient. According to the scheme, whether the heat exchanger needs to be cleaned can be accurately determined.

Description

Technical Field

[0001] This invention relates to air conditioning technology, and in particular to a cleaning control method for an air conditioner and an air conditioner. Background Technology

[0002] During long-term operation, dust, lint, and other contaminants easily accumulate on the surface of the fins of the core heat exchanger in air conditioners. This dirt adheres to the spaces between the fins and the surface of the heat exchange tubes, creating additional thermal resistance and severely hindering heat exchange between the air and the refrigerant. This leads to decreased heat exchange efficiency, reduced cooling / heating capacity, increased energy consumption, and potentially increased operating noise. Long-term operation can also affect the lifespan of the equipment and may promote bacterial growth, impacting air quality. Current air conditioner cleaning controls mostly use timed cleaning modes, which cannot match the actual dirt and blockage status of the heat exchanger, making it difficult to accurately control the cleaning timing and easily resulting in over-cleaning or untimely cleaning. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a cleaning control method and air conditioner for an air conditioner that overcomes or at least partially solves the above problems, at least to solve the technical problem of inaccurate judgment of the cleaning timing of heat exchangers in the prior art.

[0004] According to one aspect of the present invention, a cleaning control method for an air conditioner is provided, comprising: Obtain the heat exchanger's heat exchange capacity within a first preset operating time; The fouling growth coefficient of the heat exchanger is determined based on the heat exchange volume. The need for cleaning of the heat exchanger is determined based on the fouling growth coefficient.

[0005] Optionally, determining the fouling growth coefficient of the heat exchanger based on the heat exchange volume includes: The airflow temperature difference on both sides of the refrigerant inlet of the heat exchanger is recorded as the first temperature difference, and the airflow temperature difference on both sides of the refrigerant outlet of the heat exchanger is recorded as the second temperature difference. The heat transfer coefficient of the heat exchanger is determined based on the heat exchange volume, the first temperature difference, and the second temperature difference. The fouling thermal resistance of the heat exchanger is determined based on the heat transfer coefficient. The fouling growth coefficient is determined based on the fouling thermal resistance.

[0006] Optionally, determining the heat transfer coefficient of the heat exchanger based on the heat exchange volume, the first temperature difference, and the second temperature difference includes: The average temperature difference is determined based on the first temperature difference and the second temperature difference; the average temperature difference is half the sum of the first temperature difference and the second temperature difference. Obtain the heat exchange area of ​​the heat exchanger; The heat transfer coefficient is determined based on the heat exchange capacity, the heat exchange area, and the average temperature difference. The relationship between the heat transfer coefficient and the fouling thermal resistance of the heat exchanger is as follows: ,in The heat transfer coefficient is... The heat transfer coefficient is the ratio of the refrigerant in the heat exchanger to the heat exchange tubes of the heat exchanger. The heat transfer coefficient is the ratio of the air flowing through the heat exchanger to the heat exchange tubes of the heat exchanger. The thermal resistance of the heat exchanger tubes is given. The thermal resistance of the aforementioned dirt.

[0007] Optionally, determining the fouling growth coefficient based on the fouling thermal resistance includes: Obtain the initial fouling thermal resistance and the operating time of the heat exchanger; The fouling growth coefficient is determined based on the fouling thermal resistance, the initial fouling thermal resistance, and the operating time of the heat exchanger.

[0008] Optionally, obtaining the heat exchange capacity of the heat exchanger within a first preset operating time includes: The temperature difference between the two sides of the heat exchanger is obtained and recorded as the third temperature difference; Obtain the mass of the air flowing through the heat exchanger during a first preset operating time; The heat exchange is determined based on the third temperature difference, the specific heat capacity of the air, and the mass of the air.

[0009] Optionally, determining whether the heat exchanger needs cleaning based on the fouling growth coefficient includes: Determine whether the fouling growth coefficient is greater than or equal to a first threshold; If so, the heat exchanger needs to be cleaned.

[0010] Optionally, the cleaning control method for the air conditioner further includes: After cleaning the heat exchanger, the fouling thermal resistance of the heat exchanger is obtained within a second preset time period. Determine whether the thermal resistance of the fouling is greater than or equal to the second threshold. If so, if it is determined that the heat exchanger has not been completely cleaned, the first threshold is reduced, and it is determined that the heat exchanger needs to be cleaned or a heat exchanger clogging warning is issued. If not, the fouling thermal resistance shall be used as the initial fouling thermal resistance.

[0011] Optionally, the cleaning control method for the air conditioner further includes: Obtain parameters of the fouling risk factor of the space where the heat exchanger is located; When the parameter of the fouling risk factor is greater than or equal to the parameter threshold, the cumulative operating time of the heat exchanger is calculated. The first threshold is reduced based on the cumulative working time.

[0012] Optionally, the dirt risk factor is one, and reducing the first threshold based on the cumulative working time includes: When the cumulative working time is greater than or equal to the time threshold, decrease the first threshold; or, The dirt and grime risk factors are multiple, and the step of reducing the first threshold based on the cumulative working time includes: Determine whether the overlapping working time of any two of the multiple cumulative working times is greater than the overlap threshold; If so, decrease the first threshold; If not, when any of the cumulative working hours is greater than or equal to the corresponding duration threshold, the first threshold is reduced.

[0013] According to another aspect of the present invention, an air conditioner is also provided, which includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any cleaning control method for the air conditioner.

[0014] In the air conditioner cleaning control method and air conditioner of the present invention, the fouling growth coefficient of the heat exchanger is determined based on the heat exchange capacity, and the need for cleaning of the heat exchanger is determined based on the fouling growth coefficient. Since the fouling growth coefficient is an objective quantitative indicator that directly characterizes the heat exchange performance of the heat exchanger, using it as a condition for judging the cleaning of the heat exchanger allows for an objective and accurate quantitative assessment of the actual degree of dirt on the heat exchanger. This enables precise determination of the heat exchanger's cleaning needs, facilitating on-demand cleaning. This fundamentally ensures that the heat exchanger is always in good heat exchange condition, avoiding resource waste caused by ineffective cleaning, promptly removing dirt and blockages to stably maintain the heat exchange efficiency of the air conditioner, reducing unnecessary operating energy consumption, and ensuring the continuity of cooling and heating effects.

[0015] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0016] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 4 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 5 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 6 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 7 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention; Figure 8 This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention. Detailed Implementation

[0017] In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0018] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0019] This invention provides a cleaning control method for air conditioners. Figure 1This is a schematic flowchart of a cleaning control method for an air conditioner according to an embodiment of the present invention. The method generally includes: Step S100: Obtain the heat exchange of the heat exchanger within the first preset working time; Step S200: Determine the fouling growth coefficient of the heat exchanger based on the amount of heat exchanged; Step S300: Determine whether the heat exchanger needs to be cleaned based on the fouling growth coefficient.

[0020] Specifically, during the first preset working period, the compressor can be in standby mode, that is, the compressor can be shut down when the temperature is reached.

[0021] In this embodiment, the fouling growth coefficient of the heat exchanger is determined based on its heat exchange capacity, and the need for cleaning is determined based on this coefficient. Since the fouling growth coefficient is an objective quantitative indicator that directly characterizes the heat exchanger's heat exchange performance, using it as a condition for cleaning judgment allows for an objective and accurate quantitative assessment of the actual degree of dirt on the heat exchanger. This enables precise determination of the heat exchanger's cleaning needs, facilitating on-demand cleaning. This fundamentally ensures that the heat exchanger is always in good heat exchange condition, avoiding resource waste caused by ineffective cleaning, promptly removing dirt and blockages to maintain stable heat exchange efficiency of the air conditioner, reducing unnecessary energy consumption, and ensuring the continuity of cooling and heating effects.

[0022] In some alternative embodiments of the present invention, the heat exchanger is an evaporator or a condenser.

[0023] In some optional embodiments of the present invention, the first preset working time can be from 0.5 min to 2 min; preferably, the first preset working time can be 1 min.

[0024] In some optional embodiments of the present invention, after the air conditioner enters a stable operating state (for example, after the compressor frequency has been running stably for 10 minutes), the cleaning judgment process is initiated, that is, step S101 is executed.

[0025] like Figure 2 As shown, in some optional embodiments of the present invention, obtaining the heat exchanger's heat exchange capacity within a first preset operating time includes: Step S110: Obtain the temperature difference between the two sides of the heat exchanger and record it as the third temperature difference; Step S120: Obtain the mass of air flowing through the heat exchanger during the first preset working time; Step S130: Determine the heat exchange based on the third temperature difference, the specific heat capacity of the air, and the mass of the air.

[0026] Specifically, the temperature difference between the two sides of a heat exchanger reflects the overall temperature difference between the inlet and outlet sides of the heat exchanger. This embodiment provides a specific method for obtaining heat exchange capacity, which is easy to implement and yields accurate results.

[0027] In some optional embodiments of the present invention, in step S130, the formula for calculating the heat exchange is: ; in, For heat exchange, c is the specific heat capacity of air under constant pressure, and m is the mass of air flowing through the heat exchanger during the first preset working time. This is the first preset working time.

[0028] like Figure 3 As shown, in some optional embodiments of the present invention, determining the fouling growth coefficient of the heat exchanger based on the heat exchange volume includes: Step S210: Obtain the airflow temperature difference on both sides of the refrigerant inlet of the heat exchanger, denoted as the first temperature difference, and the airflow temperature difference on both sides of the refrigerant outlet of the heat exchanger, denoted as the second temperature difference. Step S220: Determine the heat transfer coefficient of the heat exchanger based on the heat exchange volume, the first temperature difference, and the second temperature difference; Step S230: Determine the fouling thermal resistance of the heat exchanger based on the heat transfer coefficient; Step S240: Determine the fouling growth coefficient based on the fouling thermal resistance.

[0029] Specifically, the first temperature difference refers to the temperature difference between the inlet air and the outlet air at the inlet location of the refrigerant pipeline entering the heat exchanger. This first temperature difference reflects the initial heat transfer intensity between the refrigerant and the air at the heat exchanger inlet section. The second temperature difference refers to the temperature difference between the inlet air and the outlet air at the outlet location of the refrigerant pipeline leaving the heat exchanger. This second temperature difference reflects the final heat transfer intensity between the refrigerant and the air at the heat exchanger outlet section.

[0030] This embodiment provides a specific method for determining the fouling growth coefficient of a heat exchanger based on the amount of heat exchanged. This method is scientifically sound, easy to implement, and yields reliable results.

[0031] like Figure 4 As shown, in some optional embodiments of the present invention, determining the heat transfer coefficient of the heat exchanger based on the heat exchange volume, the first temperature difference, and the second temperature difference includes: Step S221: Determine the average temperature difference based on the first temperature difference and the second temperature difference; the average temperature difference is half the sum of the first temperature difference and the second temperature difference. Step S222: Obtain the heat exchange area of ​​the heat exchanger; Step S223: Determine the heat transfer coefficient based on the heat exchange volume, the heat exchange area, and the average temperature difference.

[0032] This embodiment provides a specific method for obtaining the heat transfer coefficient, which has the advantages of being scientifically reliable and easy to operate.

[0033] In some optional embodiments of the present invention, determining the heat transfer coefficient based on the heat exchange capacity, the heat exchange area, and the average temperature difference includes: Step S2231: Obtain the instantaneous heat transfer of the heat exchanger based on the heat exchange capacity and the first preset working time; Step S2232: Determine the heat transfer coefficient based on the instantaneous heat transfer, the heat exchange area, and the average temperature difference.

[0034] Specifically, the instantaneous heat exchanger is the average heat exchanged per second within a first preset operating time.

[0035] The relationship between instantaneous heat transfer and heat transfer coefficient is as follows: ; in, For instantaneous heat transfer, Let A be the current average temperature difference, and A be the heat exchange area. The heat transfer coefficient is denoted as .

[0036] When the first preset working time is 1 minute .

[0037] In some optional embodiments of the present invention, the relationship between the heat transfer coefficient and the fouling thermal resistance of the heat exchanger is as follows: , in The heat transfer coefficient is... The heat transfer coefficient is the ratio of the refrigerant in the heat exchanger to the heat exchange tubes of the heat exchanger. The heat transfer coefficient is the ratio of the air flowing through the heat exchanger to the heat exchange tubes of the heat exchanger. The thermal resistance of the heat exchanger tubes is given. The thermal resistance of the aforementioned dirt. , , All are constant values.

[0038] like Figure 5 As shown, in some optional embodiments of the present invention, determining the fouling growth coefficient based on the fouling thermal resistance includes: Step S241: Obtain the initial fouling thermal resistance and the operating time of the heat exchanger; Step S242: Determine the fouling growth coefficient based on the fouling thermal resistance, the initial fouling thermal resistance, and the operating time of the heat exchanger.

[0039] Specifically, the formula for calculating the dirt growth factor is: ; in, The dirt growth factor, R is the initial fouling thermal resistance, and t is the operating time of the heat exchanger.

[0040] This embodiment calculates the fouling growth coefficient by combining the initial state and the running time, which has the beneficial effects of scientific quantification, strong adaptability, and convenient decision-making.

[0041] like Figure 6 As shown, in some optional embodiments of the present invention, determining whether the heat exchanger needs cleaning based on the fouling growth coefficient includes: Step S310: Determine whether the dirt growth coefficient is greater than or equal to the first threshold; if so, proceed to step S320. Step S320: Determine that the heat exchanger needs to be cleaned.

[0042] In this embodiment, when the fouling growth coefficient reaches a first threshold, it indicates that the heat exchanger's heat exchange performance has deteriorated to the point of affecting normal operation due to fouling, and at this time, it is determined that the heat exchanger needs to be cleaned. Conversely, when the fouling growth coefficient is less than the first threshold, it is determined that the heat exchanger does not need to be cleaned. Using the method of this embodiment, accurate identification of when to clean the heat exchanger can be achieved.

[0043] like Figure 7 As shown, in some optional embodiments of the present invention, the cleaning control method for the air conditioner further includes: Step S410: After cleaning the heat exchanger, obtain the fouling thermal resistance of the heat exchanger within a second preset time period. Step S420: Determine whether the thermal resistance of the fouling is greater than or equal to the second threshold; if yes, proceed to step S430; if no, proceed to step S440. Step S430: Determine that the heat exchanger has not been completely cleaned, reduce the first threshold, and determine that the heat exchanger needs to be cleaned or issue a heat exchanger clogging warning. Step S440: Use the fouling thermal resistance as the initial fouling thermal resistance.

[0044] Specifically, in step S410, the fouling thermal resistance of the heat exchanger refers to the fouling thermal resistance of the heat exchanger immediately after it has been cleaned and started up, at which point the heat exchanger is in a clean state.

[0045] In this embodiment, by introducing a post-cleaning effect verification and parameter self-learning mechanism, an upgrade from single-judgment to a continuously optimized intelligent closed loop is achieved. The scheme first verifies the actual effect of the cleaning operation. By comparing the measured fouling thermal resistance after cleaning with a second threshold representing the "cleanliness state," it can effectively identify whether the cleaning is thorough. If the standard is not met, the system will reduce the first threshold (cleaning judgment threshold) to improve the sensitivity of subsequent monitoring and determine whether the heat exchanger needs cleaning or directly issue a heat exchanger blockage alarm. This achieves intelligent diagnosis and early warning of abnormal situations such as "incomplete cleaning" or "heat exchanger blockage," improving system reliability. If the verification is successful, the key benchmark parameter "initial fouling thermal resistance" is updated with the measured value, ensuring that all subsequent calculations and judgments dynamically reflect the current real state of the equipment. This achieves self-calibration of core parameters and continuous optimization of system performance, ensuring the continuous accuracy of judgments over long-term operation.

[0046] like Figure 8 As shown, in some optional embodiments of the present invention, the cleaning control method for the air conditioner further includes: Step S510: Obtain the parameters of the fouling risk factor of the space where the heat exchanger is located; Step S520: When the parameter of the fouling risk factor is greater than or equal to the threshold, the cumulative operating time of the heat exchanger is accumulated. Step S530: Decrease the first threshold based on the cumulative working time.

[0047] Specifically, the dirt risk factor in step S510 is used to quantify the impact of the environment on the dirt-clogging rate of the heat exchanger. Its parameters may include one or more of the following: the concentration of suspended particulate matter in the ambient air, the relative humidity of the environment, and the duration of a specific operating mode (such as continuous ventilation).

[0048] Step S520 may include: obtaining the cumulative operating time of the heat exchanger under the condition that the ambient humidity of its space is greater than or equal to a preset humidity; and / or, obtaining the cumulative operating time of the heat exchanger under the condition that the concentration of suspended particulate matter in its space is greater than or equal to a preset concentration.

[0049] In dusty environments, when the difference between the indoor unit's return air temperature and the set temperature remains small (indicating low load), but the fan continues to run at high speed, it may be in ventilation mode, leading to increased dust intake. In hot and humid weather, the evaporator surface remains constantly moist, making it easier for dust and particulate matter to adhere. Therefore, under these special operating conditions, reducing the first threshold based on the operating time when the dirt risk factor parameter is greater than or equal to the threshold allows for more sensitive cleaning demand assessment in harsh environments. This upgrade achieves environmental adaptive judgment, enabling timely cleaning intervention in the early stages of dirt accumulation and before performance degradation becomes severe, thereby improving the timeliness, preventative nature, and adaptability to different usage scenarios of cleaning control.

[0050] In some optional embodiments of the present invention, the dirt risk factor is one, and the step of reducing the first threshold according to the cumulative working time includes: reducing the first threshold when the cumulative working time is greater than or equal to the time threshold. In this embodiment, the sensitivity of the cleaning judgment can be improved through the above settings.

[0051] In some optional embodiments of the present invention, the dirt risk factors are multiple, and the step of reducing the first threshold according to the cumulative working time includes: Step S531: Determine whether the overlapping working time of any two of the multiple cumulative working times is greater than the overlap threshold; if yes, proceed to S532; if no, proceed to S533. Step S532, decrease the first threshold; Step S533: When any of the cumulative working hours is greater than or equal to the corresponding duration threshold, decrease the first threshold.

[0052] Specifically, if there are multiple contamination risk factors, and the overlapping working time of any two of the multiple cumulative working times corresponding to these multiple contamination risk factors is less than or equal to a threshold, then the one that meets the condition first can have its first threshold reduced. If the overlapping working time is greater than the threshold, the first threshold is reduced.

[0053] This embodiment can adaptively adjust the sensitivity of the cleaning triggering mechanism in complex situations where a single high-risk factor is continuously acting or multiple risk factors are superimposed, thereby ensuring timely cleaning while avoiding excessively frequent cleaning triggers due to short-term or isolated fluctuations in operating conditions.

[0054] In some optional embodiments of the present invention, the cleaning control method for air conditioners further includes: Step S610: If the heat exchanger needs to be cleaned, determine whether a shutdown signal has been received. Step S620: If yes, clean the heat exchanger.

[0055] Specifically, the self-cleaning mode is activated only when the heat exchanger needs cleaning and a shutdown signal is received.

[0056] This embodiment effectively isolates cleaning and maintenance operations from air conditioning usage periods by linking the cleaning execution conditions with the air conditioning shutdown signal. This avoids any impact on the normal cooling / heating function of the air conditioner during the cleaning process, optimizing the user experience while ensuring equipment performance.

[0057] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the method are included in every case. Furthermore, the method may include additional operations. Within the scope of the technical concept provided by the method in this embodiment, additional variations can be made to the above method.

[0058] This embodiment also provides an air conditioner. The air conditioner may include a memory, a processor, and the aforementioned computer program stored in the memory and running on the processor. The processor is adapted to execute stored instructions and may be a single-core processor, a multi-core processor, a computing cluster, or any number of other configurations. The memory provides temporary storage space for the operation of instructions during operation. The memory may include random access memory (RAM), read-only memory, flash memory, or any other suitable storage system. When the computer program is executed by the processor, it implements the steps of the cleaning control method of the air conditioner according to any of the above embodiments.

[0059] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A cleaning control method for an air conditioner, characterized in that, include: Obtain the heat exchanger's heat exchange capacity within a first preset operating time; The fouling growth coefficient of the heat exchanger is determined based on the heat exchange volume. The need for cleaning of the heat exchanger is determined based on the fouling growth coefficient.

2. The cleaning control method for an air conditioner according to claim 1, characterized in that, Determining the fouling growth coefficient of the heat exchanger based on the heat exchange volume includes: The airflow temperature difference on both sides of the refrigerant inlet of the heat exchanger is recorded as the first temperature difference, and the airflow temperature difference on both sides of the refrigerant outlet of the heat exchanger is recorded as the second temperature difference. The heat transfer coefficient of the heat exchanger is determined based on the heat exchange volume, the first temperature difference, and the second temperature difference. The fouling thermal resistance of the heat exchanger is determined based on the heat transfer coefficient. The fouling growth coefficient is determined based on the fouling thermal resistance.

3. The cleaning control method for an air conditioner according to claim 2, characterized in that, Determining the heat transfer coefficient of the heat exchanger based on the heat exchange volume, the first temperature difference, and the second temperature difference includes: The average temperature difference is determined based on the first temperature difference and the second temperature difference; the average temperature difference is half the sum of the first temperature difference and the second temperature difference. Obtain the heat exchange area of ​​the heat exchanger; The heat transfer coefficient is determined based on the heat exchange capacity, the heat exchange area, and the average temperature difference. The relationship between the heat transfer coefficient and the fouling thermal resistance of the heat exchanger is as follows: ,in The heat transfer coefficient is... The heat transfer coefficient is the ratio of the refrigerant in the heat exchanger to the heat exchange tubes of the heat exchanger. The heat transfer coefficient is the ratio of the air flowing through the heat exchanger to the heat exchange tubes of the heat exchanger. The thermal resistance of the heat exchanger tubes is given. The thermal resistance of the aforementioned dirt.

4. The cleaning control method for an air conditioner according to claim 2, characterized in that, The step of determining the fouling growth coefficient based on the fouling thermal resistance includes: Obtain the initial fouling thermal resistance and the operating time of the heat exchanger; The fouling growth coefficient is determined based on the fouling thermal resistance, the initial fouling thermal resistance, and the operating time of the heat exchanger.

5. The cleaning control method for an air conditioner according to claim 1, characterized in that, The acquisition of the heat exchanger's heat exchange capacity within a first preset operating time includes: The temperature difference between the two sides of the heat exchanger is obtained and recorded as the third temperature difference; Obtain the mass of the air flowing through the heat exchanger during a first preset operating time; The heat exchange is determined based on the third temperature difference, the specific heat capacity of the air, and the mass of the air.

6. The cleaning control method for an air conditioner according to claim 4, characterized in that, The step of determining whether the heat exchanger needs cleaning based on the fouling growth coefficient includes: Determine whether the fouling growth coefficient is greater than or equal to a first threshold; If so, the heat exchanger needs to be cleaned.

7. The cleaning control method for an air conditioner according to claim 6, characterized in that, Also includes: After cleaning the heat exchanger, the fouling thermal resistance of the heat exchanger is obtained within a second preset time period. Determine whether the thermal resistance of the fouling is greater than or equal to the second threshold. If so, if it is determined that the heat exchanger has not been completely cleaned, the first threshold is reduced, and it is determined that the heat exchanger needs to be cleaned or a heat exchanger clogging warning is issued. If not, the fouling thermal resistance shall be used as the initial fouling thermal resistance.

8. The cleaning control method for an air conditioner according to claim 6, characterized in that, Also includes: Obtain parameters of the fouling risk factor of the space where the heat exchanger is located; When the parameter of the fouling risk factor is greater than or equal to the parameter threshold, the cumulative operating time of the heat exchanger is calculated. The first threshold is reduced based on the cumulative working time.

9. The cleaning control method for an air conditioner according to claim 8, characterized in that, The dirt risk factor is one, and the step of reducing the first threshold based on the cumulative working time includes: When the cumulative working time is greater than or equal to the time threshold, decrease the first threshold; or, The dirt and grime risk factors are multiple, and the step of reducing the first threshold based on the cumulative working time includes: Determine whether the overlapping working time of any two of the multiple cumulative working times is greater than the overlap threshold; If so, decrease the first threshold; If not, when any of the cumulative working hours is greater than or equal to the corresponding duration threshold, the first threshold is reduced.

10. An air conditioner, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the cleaning control method for the air conditioner according to any one of claims 1 to 9.

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