Anti-condensation control method, device and system for air conditioner and air conditioner

Abstract

The invention discloses an air conditioner condensation prevention control method, device and system and an air conditioner, and belongs to the field of air conditioner condensation prevention. The air conditioner anti-condensation control method comprises the steps that after target parameters are obtained, a target threshold value is obtained through calculation based on the target parameters; and when the temperature difference value of the evaporator surface temperature and the dew point temperature is smaller than the target threshold value, anti-condensation control is conducted. According to the scheme, the threshold value is dynamically determined based on the indoor air humidity and the operation frequency of the compressor, and the threshold value is substantially the allowable minimum temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When it is monitored that the actual temperature difference between the two is lower than the dynamic threshold value, the controller automatically starts an anti-condensation measure; condensation can be prevented in time, condensation and water dripping of the indoor unit are prevented, the comfort level of a user can be guaranteed as much as possible, and the user experience is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning anti-condensation technology, and in particular, to an air conditioner anti-condensation control method, device and system, and an air conditioner. Background Technology

[0002] Air conditioning condensation refers to the phenomenon where water vapor in the air condenses into water droplets when the surface temperature of the ducts or equipment is lower than the dew point temperature of the surrounding air during the operation of an air conditioning system. This phenomenon can cause various harms to equipment, the environment, and human health. For example, it can corrode equipment, generate mold, or cause water to be blown out of the air conditioning vents.

[0003] Common anti-condensation methods include: reducing the evaporator surface temperature by limiting the compressor's operating frequency; increasing the thermal conductivity of the evaporator fins by using hydrophilic aluminum foil materials; and controlling the air conditioner's "anti-condensation mode" by intermittent compressor operation. For example, during air conditioning cooling operation, the system determines whether to prevent condensation formation in the indoor unit based on the indoor ambient temperature, indoor relative humidity, and the amount of water drained by the air conditioner per unit time. If it is determined that condensation formation in the indoor unit should be prevented, the compressor's operating frequency and the outdoor fan speed are controlled. This solution, by controlling the compressor's operating frequency and the outdoor fan speed during the anti-condensation process, fundamentally disrupts the conditions for condensation formation, solves the problem of condensation dripping from the indoor unit, and improves the user experience.

[0004] The core of technologies that prevent condensation by controlling compressor frequency or operating mode is determining when condensation will occur, and then implementing anti-condensation control accordingly. Based on the conditions for condensation formation, existing technologies generally determine whether to implement anti-condensation control by comparing the difference between the evaporator surface temperature and the dew point temperature with a set threshold. However, existing technologies all use fixed thresholds, which cannot meet practical needs. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this application provides an air conditioner anti-condensation control method, device, system, and air conditioner, addressing the problem that existing technologies generally determine whether to perform anti-condensation control based on the difference between the dew point temperature and the evaporator surface temperature and a set threshold. However, existing technologies all use fixed thresholds, which cannot meet practical needs.

[0006] The technical solution adopted by this application to solve its technical problem is: Firstly, a method for preventing condensation in an air conditioner is provided, including: Obtain target parameters, including indoor air humidity and compressor operating frequency; Determine the target threshold based on the target parameters; When the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is implemented.

[0007] As an optional implementation of this application, determining the target threshold based on the target parameter includes: The target threshold is calculated using the following formula: ; in, For the target threshold, and The coefficient is determined based on the compressor's operating frequency. The preset base threshold, Indoor air humidity.

[0008] As an optional implementation of this application, it also includes: ; in, , Let t be the constant obtained from the fitting, and t be the compressor running time. The time decay constant, For the compressor operating frequency, and The compressor operating frequency is The maximum and minimum values ​​of k.

[0009] As an optional implementation of this application, the step of preventing condensation control includes: Calculate the temperature difference between the evaporator surface temperature and the dew point temperature, and the target difference from the target threshold. The condensation risk level is determined based on the range of the target difference, and the target anti-condensation control strategy is determined based on the condensation risk level. Control is performed based on the aforementioned target anti-condensation control strategy.

[0010] As an optional implementation of this application, the step of determining the condensation risk level based on the interval where the target difference lies, and determining the target anti-condensation control strategy based on the condensation risk level, includes: When the target difference is greater than the first preset difference, it is determined to be low risk of condensation. The target control strategy for low risk of condensation is to increase the speed of the internal fan until the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold. When the target difference is greater than or equal to the second preset difference and less than the first preset difference, it is determined to be at medium risk of condensation. The target control strategy for medium risk of condensation is to reduce the compressor operating frequency and re-judge the condensation risk level every first preset time interval. If it is still at medium risk of condensation, the compressor operating frequency is reduced again and the internal fan speed is increased. When the target difference is less than the second preset difference, it is determined to be a high risk of condensation. The target control strategy for high risk of condensation is to control the compressor to run intermittently and re-determine the condensation risk level every second preset time interval. If it is still a high risk of condensation after the specified time, the dehumidification mode is run.

[0011] As an optional implementation of this application, it also includes: When the compressor is running, increase the internal fan speed and reduce the compressor operating frequency; Reduce the internal fan speed when the compressor stops running.

[0012] As an optional implementation of this application, the first preset duration is longer than the second preset duration.

[0013] As an optional implementation of this application, it also includes: The current operating state is maintained when the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold.

[0014] Secondly, an anti-condensation control device for an air conditioner is provided, comprising: The target parameter acquisition module is used to acquire target parameters, including indoor air humidity and compressor operating frequency; The target threshold calculation module is used to determine the target threshold based on the target parameters; The anti-condensation control module is used to perform anti-condensation control when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold.

[0015] Thirdly, an air conditioner anti-condensation control system is provided, including: At least one processor and at least one memory; The memory stores the executable instructions of the processor; The processor is configured to perform the air conditioner anti-condensation control method described in any of the preceding claims.

[0016] Fourthly, an air conditioner is provided that applies the anti-condensation control method for air conditioners described in any of the above-mentioned claims.

[0017] Beneficial effects: This application provides a method, device, system, and air conditioner for preventing condensation. The method includes: after acquiring target parameters, calculating a target threshold based on those parameters; and implementing anti-condensation control when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold. Specifically, this application dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation dripping from the indoor unit while maximizing user comfort and improving the user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0019] Figure 1 This is a flowchart of an air conditioner anti-condensation control method provided in an embodiment of this application; Figure 2 This is a flowchart of a specific anti-condensation control method for an air conditioner provided in an embodiment of this application; Figure 3 This is a flowchart illustrating the specific implementation of an air conditioner anti-condensation control method provided in this application embodiment; Figure 4 This is a schematic diagram of the structure of an air conditioner anti-condensation control device provided in an embodiment of this application; Figure 5 This is a schematic diagram of an air conditioner anti-condensation control system provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] When preventing condensation by changing the compressor's operating frequency or mode, it generally sacrifices some user comfort. Therefore, determining when to activate anti-condensation is crucial. Current technology typically compares the difference between the evaporator surface temperature and the dew point temperature with a preset fixed threshold. When the difference is less than the threshold, condensation generally won't occur on the evaporator surface. Activating anti-condensation control in this case would affect the air conditioner's normal operation and reduce user comfort; therefore, it's not activated. Conversely, when the difference exceeds the threshold, condensation is highly likely on the evaporator surface, necessitating anti-condensation control. However, fixed thresholds are usually designed based on experience and only meet general requirements. In some special cases, anti-condensation control might activate before there's any risk of condensation on the evaporator surface, affecting normal air conditioner operation, or condensation might have already occurred on the evaporator surface before anti-condensation control was activated, further reducing the user experience.

[0022] To solve the above problems, refer to... Figure 1 and Figure 2 This application provides an air conditioner anti-condensation control method, including: S11: Obtain target parameters, including indoor air humidity and compressor operating frequency; Indoor air humidity is obtained from the indoor humidity sensor installed in the air conditioner. If the air conditioner does not have a humidity sensor, it can obtain the humidity by communicating with a device that can obtain the indoor humidity sensor. The compressor operating frequency is directly selected.

[0023] S12: Determine the target threshold based on the target parameters; In one embodiment, a base threshold is set, and then the base threshold is adjusted based on indoor air humidity and compressor operating frequency. For example, the higher the indoor air humidity, the higher the target threshold, because higher humidity makes condensation more likely. Therefore, a higher target threshold at higher humidity allows for early control and prevention of condensation. See Table 1: Table 1 Indoor humidity Ws Base threshold increase ＜30% 0.1 30%≤Ws<50% 0.2 50%≤Ws<70% 0.3 70%≤Ws<90% 0.4 The higher the compressor operating frequency, the higher the base threshold. Therefore, the higher the compressor operating frequency, the faster the evaporator surface temperature changes. Thus, in order to prevent condensation in time, a larger target threshold needs to be set.

[0024] Specifically, a mapping table similar to Table 1 can be set up, where each compressor operating frequency under each indoor air humidity condition corresponds to a target threshold. When using the system, the target threshold can be determined directly from the mapping table.

[0025] In another embodiment, this application constructs a mathematical formula for the target threshold based on historical data and experiments. The target threshold is calculated using the following formula: ; in, For the target threshold, and The coefficient is determined based on the compressor's operating frequency. The preset base threshold, Indoor air humidity.

[0026] It is understandable that the compressors operate at different frequencies. and The values ​​differ. In one implementation, a pre-defined correspondence can be set, and the value is determined based on this correspondence. and In another implementation, the compressor operating time and frequency indirectly affect the dew point temperature. Prolonged high-frequency compressor operation results in a lower evaporator temperature, more intense air cooling, reduced indoor air humidity, and a faster drop in dew point temperature. Compared to high-frequency operation, low-frequency operation has weaker dehumidification capacity and a slower rate of dew point temperature decrease. Based on this principle, a functional relationship between compressor operating frequency and operating time and k is constructed, yielding the following formula: ; in, , Let t be the constant obtained from the fitting, and t be the compressor running time. The time decay constant, For the compressor operating frequency, and The compressor operating frequency is The maximum and minimum values ​​of k.

[0027] S13: When the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is performed.

[0028] Dew point temperature, or simply dew point, is a crucial concept in meteorology and thermodynamics. It is defined as the temperature at which liquid water begins to condense (condensation) when air is cooled to just reach saturation (relative humidity of 100%), under constant air pressure and water vapor content (absolute humidity). The dew point temperature directly reflects the amount of water vapor in the air. A higher dew point temperature indicates a richer water vapor content in the air, making it feel more humid and muggy; conversely, a lower dew point temperature indicates drier air.

[0029] Relationship with actual temperature: When the actual temperature of the air drops to or below the dew point temperature, water vapor will condense.

[0030] Accurate calculation of dew point temperature involves complex formulas, the most common being approximate calculations based on the Magnus formula. Here is a relatively simple and widely used simplified formula: Known parameters: T: Current dry-bulb temperature of the air (unit: degrees Celsius °C) RH: The current relative humidity of the air (unit: percentage, converted to decimal for calculation, e.g., 70% = 0.7). Calculation steps: Calculate the saturated vapor pressure (Es): The maximum water vapor pressure that air can hold at temperature T.

[0031] Calculate the actual water vapor pressure (E): the actual water vapor pressure currently present in the air.

[0032] Calculate the dew point temperature (Td): Set the actual water vapor pressure E to be equal to the saturated water vapor pressure at that temperature, and the temperature obtained by inverse solution is the dew point.

[0033] .

[0034] In one embodiment, anti-condensation control can be implemented using existing technologies, such as activating the heating module, adjusting the air outlet direction, increasing the fan speed, or increasing the set temperature. Alternatively, as disclosed in CN120926598A, the initial energy requirement Q of the compressor is determined based on the downtime interval m, and the target parameters are periodically refreshed; the compressor cooling capacity q is obtained based on the target parameters, the actual dehumidification capacity Dx is determined based on the compressor cooling capacity q, and the dynamic dew point temperature Tdn is obtained based on the actual dehumidification capacity Dx; and the real-time compressor energy requirement Qn and anti-condensation running time Hn are updated based on the dynamic dew point temperature Tdn, thereby adjusting the compressor speed. This application enables the outdoor unit to perform fuzzy control for anti-condensation protection even when there is no communication between the indoor and outdoor units; it can also adjust the cooling load output in real time according to different humidity levels, ensuring no condensation and rapid cooling.

[0035] In another embodiment, the anti-condensation control includes: Calculate the temperature difference between the evaporator surface temperature and the dew point temperature, and the target difference from the target threshold. The condensation risk level is determined based on the range of the target difference, and the target anti-condensation control strategy is determined based on the condensation risk level. Control is performed based on the aforementioned target anti-condensation control strategy.

[0036] The step of determining the condensation risk level based on the interval where the target difference lies, and determining the target anti-condensation control strategy based on the condensation risk level, includes: When the target difference is greater than the first preset difference, it is determined to be low risk of condensation. The target control strategy for low risk of condensation is to increase the speed of the internal fan until the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold. When the target difference is greater than or equal to the second preset difference and less than the first preset difference, it is determined to be at medium risk of condensation. The target control strategy for medium risk of condensation is as follows: reduce the compressor operating frequency, and reassess the condensation risk level every first preset time interval. If it is still at medium risk of condensation, reduce the compressor operating frequency again and increase the internal fan speed. If it becomes low risk of condensation, it can be controlled according to the low risk of condensation, or the current control method (reducing the compressor operating frequency) can continue. It is understood that unless there are significant environmental fluctuations, it generally will not become high risk. If it becomes high risk, it will be controlled according to the target control strategy for high risk.

[0037] When the target difference is less than the second preset difference, it is determined to be a high risk of condensation. The target control strategy for high risk of condensation is to control the compressor to run intermittently and re-determine the condensation risk level every second preset time interval. If it is still a high risk of condensation after the specified time, the dehumidification mode is run.

[0038] Intermittent operation refers to controlling the compressor to run for a period of time and then stop for a period of time, with the running and stopping times set based on actual needs. Because the refrigerant no longer passes through the evaporator after stopping, the evaporator surface temperature will rise, thus preventing condensation. During operation, it can continue to cool the user.

[0039] As a preferred implementation of this application, when controlling the compressor to run intermittently, it further includes: When the compressor is running, increase the internal fan speed and reduce the compressor's operating frequency. Increasing the internal fan speed accelerates airflow, making heat exchange between the evaporator and air more efficient. This results in a more uniform evaporator surface temperature and appropriately raises its average temperature, reducing areas below the dew point. At lower fan speeds, the air is in contact with the evaporator for too long, leading to over-cooling and increased condensation. Increasing the fan speed allows air to pass through the evaporator quickly, reducing the cooling amplitude and causing a more gradual temperature drop, thus lowering the risk of condensation. Simply put, increasing the fan speed addresses the problem from the "air side," while reducing the compressor's operating frequency addresses it from the "cold source side." A two-pronged approach yields the best results. Reducing the compressor's operating frequency raises the evaporation temperature above the dew point. The fundamental condition for condensation is that the evaporator surface temperature must be lower than the indoor air's dew point temperature. To prevent condensation, this condition must be broken, i.e., increasing the evaporator surface temperature. Reducing the compressor's operating frequency is the most direct way to achieve this goal. How reducing the compressor's operating frequency works: It reduces refrigerant flow and evaporation pressure. The compressor is the "heart" of the air conditioning system, and its frequency (speed) directly determines the amount of refrigerant pumped per unit time. Reducing the frequency → reducing the refrigerant circulation volume → increasing the refrigerant pressure in the evaporator. According to the thermodynamic properties of refrigerants, as the evaporation pressure increases, the corresponding saturated evaporation temperature also increases. Directly increasing the evaporator temperature: The evaporator coil exchanges heat with the internal refrigerant, and its surface temperature approaches the refrigerant's evaporation temperature. Therefore, as the evaporation temperature increases, the evaporator surface temperature also increases simultaneously. When the evaporator surface temperature is raised above the current indoor air dew point temperature, humid air will not condense into water upon contact with it, thus preventing condensation.

[0040] When the compressor stops running, reduce the indoor fan speed. Since the evaporator surface temperature rises after the compressor stops, reducing the fan speed prevents the outlet air temperature from becoming too high, ensuring the user feels the air is not cool enough and also reducing energy consumption. Additionally, the fan is not completely stopped because the evaporator surface still retains some cooling energy after the compressor stops; therefore, it remains running to utilize this cooling capacity.

[0041] In one embodiment, the first preset duration is equal to the second preset duration. When the first preset duration is equal to the second preset duration, the control logic is simple.

[0042] In another embodiment, the first preset duration is longer than the second preset duration because condensation is more likely to occur at high risk, thus requiring more frequent feedback.

[0043] As a preferred implementation of this application, although there are control schemes to reduce the compressor operating frequency in both medium and high risk scenarios, the amount by which the compressor operating frequency decreases each time is greater in high risk scenarios than in medium risk scenarios.

[0044] If the risk level remains high, it indicates that the air humidity is too high. Therefore, turn on the dehumidification mode directly to dehumidify the air.

[0045] It is understandable that when the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold, the current operating state is maintained. At this time, there is no risk of condensation or the risk of condensation is very small, and no additional control is performed.

[0046] It should be noted that any process or method description in the flowchart or otherwise described herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which the embodiments of this application pertain.

[0047] Furthermore, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The air conditioner anti-condensation control method provided in this application, after obtaining target parameters, calculates a target threshold based on the target parameters; when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is performed. That is, this application's solution dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation and dripping from the indoor unit, while also maximizing user comfort and improving the user experience.

[0049] To more clearly illustrate the proposed solution, such as Figure 3 As shown, this application provides a specific implementation flow of an air conditioner anti-condensation control method.

[0050] This air conditioner is equipped with a data acquisition module, including an indoor temperature and humidity sensor, an evaporator surface temperature sensor, and a wind speed sensor, used to collect key parameters such as indoor air temperature (Ts), humidity (Ws), evaporator surface temperature (Te), and air velocity in real time. The dew point temperature calculation module: based on the collected indoor air temperature (Ts) and humidity (Ws), uses a standard dew point temperature calculation formula (such as the Magnus formula) to calculate the current air dew point temperature (Td) in real time.

[0051] Difference Calculation Module: Calculates the difference between the dew point temperature (Td) and the evaporator surface temperature (Te), obtaining the difference DT = Te - Td. This difference is used to assess the risk of condensation.

[0052] Dynamic threshold generation module: Based on system operating status (such as cooling mode and operating time), historical data (such as past condensation events), and a multi-factor coupling model (considering ambient temperature, humidity, wind speed, etc.), it dynamically generates an anti-condensation control threshold (Th). This threshold adaptively adjusts with changes in environmental conditions, avoiding the lag and false triggering caused by a fixed threshold.

[0053] Control strategy execution module: When the difference DT is less than the dynamic threshold Th, it is determined that there is a risk of condensation. The system automatically starts the anti-condensation control strategy, including appropriately reducing the compressor operating frequency, adjusting the fan speed to increase the airflow, or switching to the anti-condensation mode; when the difference DT ≥ Th, the system resumes normal cooling operation.

[0054] Feedback optimization module: By continuously collecting system operation data (such as the execution effect of control strategies and changes in environmental parameters), analyzing the data and optimizing the parameters of the dynamic threshold model, the control accuracy and adaptability are improved.

[0055] The specific implementation method is as follows: After the air conditioning system starts in cooling mode, the data acquisition module is activated simultaneously. The indoor temperature and humidity sensor acquires the indoor temperature and humidity in real time. The acquired indoor air temperature Ts and indoor air humidity Ws are processed by the dew point temperature calculation module to calculate the real-time dew point temperature Td. The evaporator surface temperature sensor acquires the evaporator surface temperature Te in real time. The difference between the real-time dew point temperature and the evaporator surface temperature is calculated by the difference calculation module, which yields the difference DT = Td - Te. The risk prediction module provides risk level assessment feedback based on DT and Th.

[0056] The dynamic threshold generation module generates Th based on the current state. The calculation of Th is based on: 1. Environmental factors: Current Ts, Ws; 2. System status: compressor operating frequency, etc. 3. Historical data: the best threshold under similar conditions in the past.

[0057] 4. Model: For example, Th = k * f(Ts, Ws), where k and f are determined by optimization. Fixed threshold lag is avoided. The following dynamic threshold calculation formula is given: in, For the target threshold, and The coefficient is determined based on the compressor's operating frequency. The preset base threshold, Indoor air humidity; , Let t be the constant obtained from the fitting, and t be the compressor running time. The time decay constant, For the compressor operating frequency, and The compressor operating frequency is The maximum and minimum values ​​of k.

[0058] When DT ≥ Th, there is no risk of condensation, and the air conditioner operates normally. When DT < Th, there is a risk of condensation, the air conditioner triggers its risk assessment logic, and simultaneously adjusts the fan speed and compressor operating frequency. The risk assessment is as follows: ① If DT-Th≥3, the prediction module judges it to be a low-risk state of condensation; increase the speed of the internal fan until the risk is eliminated.

[0059] ②3>DT-Th≥1, the prediction module judges it as a medium-risk state of condensation; prioritize reducing the compressor operating frequency (reducing the compressor operating frequency by 1%), reassess the condensation risk every minute, if the condensation risk continues to be a medium-risk state, continue to reduce the compressor operating frequency, and simultaneously increase the fan speed (increasing the fan speed by 10%), reassess the condensation risk every minute, and continue monitoring for 10 minutes until the risk is eliminated.

[0060] ③1>DT-Th prediction module judges it as a high-risk state of condensation; the compressor enters intermittent operation mode and reduces the compressor operation frequency (reduced by 2%) during operation. The condensation risk is reassessed every 30 seconds and monitored continuously for 5 minutes. If the prediction module still judges it as high-risk, the compressor is shut down directly.

[0061] After all adjustment modes are completed, the real-time dew point temperature and evaporator surface temperature are reacquired, and the risk prediction and judgment process is repeated. Through dynamic threshold control, precise control of the condensation state is achieved, improving the response speed and accuracy of the control strategy. This method, through a multi-parameter fusion judgment mechanism, significantly improves the operational stability and user comfort of the air conditioning system in high humidity environments, while avoiding unnecessary energy waste.

[0062] This application uses the dynamic difference between dew point temperature and evaporator surface temperature (ΔT = Te - Td) as the core prediction indicator, introduces a control threshold (Th), and constructs a coupled prediction model that integrates multi-dimensional parameters to achieve real-time dynamic prediction and adaptive threshold adjustment of condensation risk. Through a closed-loop feedback mechanism, the prediction accuracy is optimized in real time, significantly improving the risk response speed (within 2 seconds) and environmental adaptability.

[0063] Based on the same inventive concept, as shown in the figure, this application provides an air conditioner anti-condensation control device 40, comprising: The target parameter acquisition module 41 is used to acquire target parameters, including indoor air humidity and compressor operating frequency. Indoor air humidity is obtained from the indoor humidity sensor installed in the air conditioner. If the air conditioner does not have a humidity sensor, it can obtain the humidity by communicating with a device that can obtain the indoor humidity sensor. The compressor operating frequency is directly selected.

[0064] Target threshold calculation module 42 is used to determine the target threshold based on the target parameters; In one embodiment, a base threshold is set, and then the base threshold is adjusted based on indoor air humidity and compressor operating frequency. For example, the higher the indoor air humidity, the higher the target threshold, because higher air humidity makes condensation more likely. Therefore, a higher target threshold at higher air humidity allows for early control and prevention of condensation.

[0065] The higher the compressor operating frequency, the higher the base threshold. Therefore, the higher the compressor operating frequency, the faster the evaporator surface temperature changes. Thus, in order to prevent condensation in time, a larger target threshold needs to be set.

[0066] Specifically, a mapping table similar to Table 1 can be set up, where each compressor operating frequency under each indoor air humidity condition corresponds to a target threshold. When using the system, the target threshold can be determined directly from the mapping table.

[0067] In another embodiment, this application constructs a mathematical formula for the target threshold based on historical data and experiments. The target threshold is calculated using the following formula: ; in, For the target threshold, and The coefficient is determined based on the compressor's operating frequency. The preset base threshold, Indoor air humidity.

[0068] It is understandable that the compressors operate at different frequencies. and The values ​​differ. In one implementation, a pre-defined correspondence can be set, and the value is determined based on this correspondence. and In another implementation, the compressor operating time and frequency indirectly affect the dew point temperature. Prolonged high-frequency compressor operation results in a lower evaporator temperature, more intense air cooling, reduced indoor air humidity, and a faster drop in dew point temperature. Compared to high-frequency operation, low-frequency operation has weaker dehumidification capacity and a slower rate of dew point temperature decrease. Based on this principle, a functional relationship between compressor operating frequency and operating time and k is constructed, yielding the following formula: ; in, , Let t be the constant obtained from the fitting, and t be the compressor running time. The time decay constant, For the compressor operating frequency, and The compressor operating frequency is The maximum and minimum values ​​of k.

[0069] The anti-condensation control module 43 is used to perform anti-condensation control when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold.

[0070] In one embodiment, anti-condensation control can be implemented using existing technologies, such as activating the heating module, adjusting the air outlet direction, increasing the fan speed, or increasing the set temperature. Alternatively, as disclosed in CN120926598A, the initial energy requirement Q of the compressor is determined based on the downtime interval m, and the target parameters are periodically refreshed; the compressor cooling capacity q is obtained based on the target parameters, the actual dehumidification capacity Dx is determined based on the compressor cooling capacity q, and the dynamic dew point temperature Tdn is obtained based on the actual dehumidification capacity Dx; and the real-time compressor energy requirement Qn and anti-condensation running time Hn are updated based on the dynamic dew point temperature Tdn, thereby adjusting the compressor speed. This application enables the outdoor unit to perform fuzzy control for anti-condensation protection even when there is no communication between the indoor and outdoor units; it can also adjust the cooling load output in real time according to different humidity levels, ensuring no condensation and rapid cooling.

[0071] In another embodiment, the anti-condensation control includes: Calculate the temperature difference between the evaporator surface temperature and the dew point temperature, and the target difference from the target threshold. The condensation risk level is determined based on the range of the target difference, and the target anti-condensation control strategy is determined based on the condensation risk level. Control is performed based on the aforementioned target anti-condensation control strategy.

[0072] The step of determining the condensation risk level based on the interval where the target difference lies, and determining the target anti-condensation control strategy based on the condensation risk level, includes: When the target difference is greater than the first preset difference, it is determined to be low risk of condensation. The target control strategy for low risk of condensation is to increase the speed of the internal fan until the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold. When the target difference is greater than or equal to the second preset difference and less than the first preset difference, it is determined to be at medium risk of condensation. The target control strategy for medium risk of condensation is as follows: reduce the compressor operating frequency, and reassess the condensation risk level every first preset time interval. If it is still at medium risk of condensation, reduce the compressor operating frequency again and increase the internal fan speed. If it becomes low risk of condensation, it can be controlled according to the low risk of condensation, or the current control method (reducing the compressor operating frequency) can continue. It is understood that unless there are significant environmental fluctuations, it generally will not become high risk. If it becomes high risk, it will be controlled according to the target control strategy for high risk.

[0073] When the target difference is less than the second preset difference, it is determined to be a high risk of condensation. The target control strategy for high risk of condensation is to control the compressor to run intermittently and re-determine the condensation risk level every second preset time interval. If it is still a high risk of condensation after the specified time, the dehumidification mode is run.

[0074] Intermittent operation refers to controlling the compressor to run for a period of time and then stop for a period of time, with the running and stopping times set based on actual needs. Because the refrigerant no longer passes through the evaporator after stopping, the evaporator surface temperature will rise, thus preventing condensation. During operation, it can continue to cool the user.

[0075] As a preferred implementation of this application, when controlling the compressor to run intermittently, it further includes: When the compressor is running, increase the internal fan speed and reduce the compressor's operating frequency. Increasing the internal fan speed accelerates airflow, making heat exchange between the evaporator and air more efficient. This results in a more uniform evaporator surface temperature and appropriately raises its average temperature, reducing areas below the dew point. At lower fan speeds, the air is in contact with the evaporator for too long, leading to over-cooling and increased condensation. Increasing the fan speed allows air to pass through the evaporator quickly, reducing the cooling amplitude and causing a more gradual temperature drop, thus lowering the risk of condensation. Simply put, increasing the fan speed addresses the problem from the "air side," while reducing the compressor's operating frequency addresses it from the "cold source side." A two-pronged approach yields the best results. Reducing the compressor's operating frequency raises the evaporation temperature above the dew point. The fundamental condition for condensation is that the evaporator surface temperature must be lower than the indoor air's dew point temperature. To prevent condensation, this condition must be broken, i.e., increasing the evaporator surface temperature. Reducing the compressor's operating frequency is the most direct way to achieve this goal. How reducing the compressor's operating frequency works: It reduces refrigerant flow and evaporation pressure. The compressor is the "heart" of the air conditioning system, and its frequency (speed) directly determines the amount of refrigerant pumped per unit time. Reducing the frequency → reducing the refrigerant circulation volume → increasing the refrigerant pressure in the evaporator. According to the thermodynamic properties of refrigerants, as the evaporation pressure increases, the corresponding saturated evaporation temperature also increases. Directly increasing the evaporator temperature: The evaporator coil exchanges heat with the internal refrigerant, and its surface temperature approaches the refrigerant's evaporation temperature. Therefore, as the evaporation temperature increases, the evaporator surface temperature also increases simultaneously. When the evaporator surface temperature is raised above the current indoor air dew point temperature, humid air will not condense into water upon contact with it, thus preventing condensation.

[0076] When the compressor stops running, reduce the indoor fan speed. Since the evaporator surface temperature rises after the compressor stops, reducing the fan speed prevents the outlet air temperature from becoming too high, ensuring the user feels the air is not cool enough and also reducing energy consumption. Additionally, the fan is not completely stopped because the evaporator surface still retains some cooling energy after the compressor stops; therefore, it remains running to utilize this cooling capacity.

[0077] In one embodiment, the first preset duration is equal to the second preset duration. When the first preset duration is equal to the second preset duration, the control logic is simple.

[0078] In another embodiment, the first preset duration is longer than the second preset duration because condensation is more likely to occur at high risk, thus requiring more frequent feedback.

[0079] As a preferred implementation of this application, although there are control schemes to reduce the compressor operating frequency in both medium and high risk scenarios, the amount by which the compressor operating frequency decreases each time is greater in high risk scenarios than in medium risk scenarios.

[0080] If the risk level remains high, it indicates that the air humidity is too high. Therefore, turn on the dehumidification mode directly to dehumidify the air.

[0081] It is understandable that when the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold, the current operating state is maintained. At this time, there is no risk of condensation or the risk of condensation is very small, and no additional control is performed.

[0082] The air conditioner anti-condensation control device provided in this application, after acquiring target parameters, calculates a target threshold based on the target parameters; when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is performed. That is, this application's solution dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation and dripping from the indoor unit, while also maximizing user comfort and improving the user experience.

[0083] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the air conditioner anti-condensation control method provided in any of the above embodiments.

[0084] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0085] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0086] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0087] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0088] The computer-readable storage medium provided in this application embodiment stores a computer program, which, when executed by a processor, implements the steps of the air conditioner anti-condensation control method as provided in any of the above embodiments. Thus, after obtaining target parameters, a target threshold is calculated based on the target parameters; when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is performed. That is, the solution in this application dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation and dripping from the indoor unit, while also maximizing user comfort and improving the user experience.

[0089] Based on the same inventive concept, such as Figure 5 As shown, this application also provides an air conditioner anti-condensation control system 50, comprising: At least one processor 51 and at least one memory 52; The memory stores the executable instructions of the processor; The processor is configured to execute the air conditioner anti-condensation control method provided in the above embodiments.

[0090] The air conditioner anti-condensation control system provided in this application embodiment stores executable instructions of the processor in a memory. When these executable instructions are executed, the processor can obtain target parameters and calculate a target threshold based on those parameters. Anti-condensation control is performed when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold. In other words, this application solution dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation and dripping from the indoor unit while maximizing user comfort and improving the user experience.

[0091] Based on the same inventive concept, this application also provides an air conditioner that applies the air conditioner anti-condensation control method provided in any of the above embodiments.

[0092] The air conditioner provided in this application embodiment, by applying the anti-condensation control method for air conditioners provided in any of the above embodiments, can calculate a target threshold based on the target parameters after obtaining them; when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is performed. That is, the solution in this application embodiment dynamically determines the threshold based on indoor air humidity and compressor operating frequency. This threshold is essentially the minimum allowable temperature difference safety boundary between the evaporator surface temperature and the dew point temperature. When the actual temperature difference is detected to be lower than this dynamic threshold, the controller automatically activates anti-condensation measures; this ensures timely anti-condensation to prevent condensation and dripping from the indoor unit, while also maximizing user comfort and improving the user experience.

[0093] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0094] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0095] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for preventing condensation in an air conditioner, characterized in that, include: Obtain target parameters, including indoor air humidity and compressor operating frequency; Determine the target threshold based on the target parameters; When the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold, anti-condensation control is implemented.

2. The method according to claim 1, characterized in that: Determining the target threshold based on the target parameters includes: The target threshold is calculated using the following formula: ； in, For the target threshold, and The coefficient is determined based on the compressor's operating frequency. The preset base threshold, Indoor air humidity.

3. The method according to claim 2, characterized in that, Also includes: ； in, , Let t be the constant obtained from the fitting, and t be the compressor running time. The time decay constant, For the compressor operating frequency, and The compressor operating frequency is The maximum and minimum values ​​of k.

4. The method according to claim 1, characterized in that, The aforementioned anti-condensation control includes: Calculate the temperature difference between the evaporator surface temperature and the dew point temperature, and the target difference from the target threshold. The condensation risk level is determined based on the range of the target difference, and the target anti-condensation control strategy is determined based on the condensation risk level. Control is performed based on the aforementioned target anti-condensation control strategy.

5. The method according to claim 4, characterized in that: The step of determining the condensation risk level based on the interval where the target difference lies, and determining the target anti-condensation control strategy based on the condensation risk level, includes: When the target difference is greater than the first preset difference, it is determined to be low risk of condensation. The target control strategy for low risk of condensation is to increase the speed of the internal fan until the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold. When the target difference is greater than or equal to the second preset difference and less than the first preset difference, it is determined to be at medium risk of condensation. The target control strategy for medium risk of condensation is to reduce the compressor operating frequency and re-judge the condensation risk level every first preset time interval. If it is still at medium risk of condensation, the compressor operating frequency is reduced again and the internal fan speed is increased. When the target difference is less than the second preset difference, it is determined to be a high risk of condensation. The target control strategy for high risk of condensation is to control the compressor to run intermittently and re-determine the condensation risk level every second preset time interval. If it is still a high risk of condensation after the specified time, the dehumidification mode is run.

6. The method according to claim 5, characterized in that, The control of the compressor during intermittent operation also includes: When the compressor is running, increase the internal fan speed and reduce the compressor operating frequency; Reduce the internal fan speed when the compressor stops running.

7. The method according to claim 5, characterized in that, The first preset duration is longer than the second preset duration.

8. The method according to claim 1, characterized in that, Also includes: The current operating state is maintained when the temperature difference between the evaporator surface temperature and the dew point temperature is greater than or equal to the target threshold.

9. An anti-condensation control device for an air conditioner, characterized in that, include: The target parameter acquisition module is used to acquire target parameters, including indoor air humidity and compressor operating frequency; The target threshold calculation module is used to determine the target threshold based on the target parameters; The anti-condensation control module is used to perform anti-condensation control when the temperature difference between the evaporator surface temperature and the dew point temperature is less than the target threshold.

10. An anti-condensation control system for an air conditioner, characterized in that, include: At least one processor and at least one memory; The memory stores the executable instructions of the processor; The processor is configured to perform the method according to any one of claims 1-8.

11. An air conditioner, characterized in that, The method described in any one of claims 1-8.

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