Air conditioner anti-condensation control method, control device and air conditioner

Abstract

This invention provides an air conditioner anti-condensation control method, control device, and air conditioner. The air conditioner anti-condensation control method includes: obtaining the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1; calculate the first temperature difference change value ΔT1, where ΔT1 = T 温差2 -T 温差1 Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 If so, the air conditioner will enter the anti-condensation mode; otherwise, the air conditioner will not enter the anti-condensation mode. This invention can achieve anti-condensation control when the indoor wet-bulb temperature cannot be obtained.

Description

Technical Field

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

[0002] With technological advancements and improved living standards, heat pump systems are becoming increasingly common in households. However, with existing heat pump units, when the indoor environment is high-humidity, the unit operates at high frequency for extended periods, resulting in low evaporator tube temperatures. As the humid indoor air passes through the evaporator, it easily condenses, which is then blown out of the duct by the fan, leading to a poor customer experience.

[0003] Currently, the common practice for heat pump units is to detect indoor dry-bulb and wet-bulb temperatures using a thermostat or wet-bulb and dry-bulb sensors. These temperatures are then used to determine if there is a risk of condensation, and appropriate anti-condensation measures are taken. However, for units using thermostats without communication capabilities (where the unit cannot obtain relevant parameters from the thermostat, and the thermostat cannot obtain unit parameters) or without wet-bulb sensors, the unit cannot obtain indoor humidity parameters. Therefore, in the absence of indoor wet-bulb temperature data, how to identify whether the indoor environment is in a state of sustained high humidity and then implement anti-condensation control to prevent condensation on the unit remains a problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide an air conditioner anti-condensation control method, control device, and air conditioner, which can determine whether the indoor air is in a state of continuous high humidity when the indoor wet-bulb temperature cannot be obtained, thereby achieving anti-condensation control.

[0005] To achieve the above objectives, according to one aspect of the present invention, an air conditioner anti-condensation control method is provided, comprising:

[0006] Obtain the indoor unit return air temperature T at time t1 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 ;

[0007] Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1;

[0008] The first temperature difference change value ΔT1 is calculated, where ΔT1 = T温差2 -T 温差1 ;

[0009] Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 If so, the air conditioner will enter the anti-condensation mode; otherwise, the air conditioner will not enter the anti-condensation mode.

[0010] The air conditioner anti-condensation control method of this application is based on the understanding that when the unit is in a high humidity condition for a long time, the difference between the return air temperature of the indoor unit and the temperature in the evaporator tube of the indoor unit does not change much. By measuring the change in the difference between the return air temperature of the indoor unit and the temperature in the evaporator tube of the indoor unit at different times, it can determine whether the indoor air is in a state of continuous high humidity, thereby determining whether there is a risk of condensation in the air conditioner, and promptly executing the preset anti-condensation operation to reduce the air conditioner condensation problem.

[0011] Therefore, the air conditioner anti-condensation control method of this application can determine the indoor air humidity by the changes in the unit's own state parameters when the unit cannot obtain the indoor wet-bulb temperature, thereby achieving anti-condensation control, ensuring the reliability of unit operation, and improving customer satisfaction.

[0012] In some implementations, the first temperature difference change threshold T 阈值1 The calculation methods include:

[0013] Establish T under high humidity conditions 温差 Data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH%.

[0014] Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L);

[0015] The first temperature difference threshold T is calculated using the following steps. 阈值1 :

[0016] T 计算1 =F(RH%max-ΔRH%,f2,L2)-F(RH%max,f1,L1);

[0017] T 计算2 =F(RH%max-2ΔRH%,f2,L2)-F(RH%max-ΔRH%,f1,L1);

[0018] T 计算3 =F(RH%max-3ΔRH%,f2,L2)-F(RH%max-2ΔRH%,f1,L1);

[0019] …

[0020] T计算n-1 =F(RH%max-(n-1)ΔRH%,f2,L2)-F(RH%max-(n-2)ΔRH%,f1,L1);

[0021] T 计算n =F(RH%min,f2,L2)-F(RH%max-(n-1)ΔRH%,f1,L1);

[0022] T 阈值1 =(T 计算1 +T 计算2 +T 计算3 +…+T 计算n-1 +T 计算n ) / n;

[0023] Where f1 is the compressor frequency at time t1, L1 is the indoor unit fan speed at time t1, f2 is the compressor frequency at time t2, and L2 is the indoor unit fan speed at time t2.

[0024] RH%max is the set maximum humidity, ΔRH% is the set maximum fluctuating humidity, and RH%min is the set minimum humidity. RH%max-(n-1)ΔRH%>RH%min≥RH%max-nΔRH%, where n is a positive integer, and n=(RH%max-RH%min) / ΔRH%.

[0025] The air conditioner anti-condensation control method implemented in this paper establishes a data table and fits the temperature difference value T. 温差 The relationship between the temperature difference threshold and the compressor frequency f, the indoor unit fan speed L, and the indoor relative humidity RH% is determined. The threshold is obtained by segmented calculation. Compared with the experimental method, the temperature difference threshold does not need to be tested for all possible combinations of humidity, frequency, and fan speed. This can reduce the requirements for testing resources and time while ensuring accuracy.

[0026] In some implementations, the anti-condensation operating mode includes reducing the indoor unit fan speed L and / or reducing the compressor frequency f.

[0027] In some embodiments, after the air conditioner enters the anti-condensation working mode, the method further includes:

[0028] Issues a high humidity alarm for the indoor environment.

[0029] The air conditioner anti-condensation control method implemented in this embodiment can remind users that the return air is continuously humid when it is determined that the indoor air is in a state of continuous high humidity, and suggest closing doors and windows to avoid the unit being in a humid state for a long time.

[0030] In some implementations, the indoor unit return air temperature T at time t1 is obtained. 回1and the temperature T in the evaporator tube of the indoor unit 管1 Previously, it also included:

[0031] Obtain the compressor frequency within a continuous preset time period;

[0032] Determine whether the compressor frequency within the continuous preset time period is greater than or equal to the high-frequency threshold. If so, proceed to obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 Steps;

[0033] If not, repeat the step of obtaining the compressor frequency within a continuous preset time period.

[0034] The air conditioner anti-condensation control method implemented in this paper first determines whether the unit has been operating at high frequency for a long time before anti-condensation detection. This is because the risk of condensation is more likely to occur when the unit is operating at high frequency for a long time and in a high humidity environment, thereby reducing the frequency of anti-condensation detection.

[0035] In some embodiments, after the air conditioner enters the anti-condensation working mode, the method further includes:

[0036] If the air conditioner remains in anti-condensation mode for longer than the preset time, the air conditioner will exit anti-condensation mode.

[0037] The air conditioner anti-condensation control method of this implementation determines whether to exit the anti-condensation working mode based on the running time of the anti-condensation working mode. After exiting the anti-condensation working mode, the indoor unit fan and compressor operate in the state before the anti-condensation control was implemented.

[0038] In some embodiments, after the air conditioner enters the anti-condensation working mode, the method further includes:

[0039] Obtain the indoor unit return air temperature T at time t3. 回3 and the temperature T in the evaporator tube of the indoor unit 管3 The third temperature difference value T is obtained. 温差3 , among which, T 温差3 =T 回3 -T 管3 ;

[0040] Obtain the indoor unit return air temperature T at time t4. 回4 and the temperature T in the evaporator tube of the indoor unit 管4 The fourth temperature difference value T is obtained. 温差4 , among which, T 温差4 =T 回4 -T 管4 t4 > t3 > t2;

[0041] The second temperature difference change value ΔT2 is calculated, where ΔT2 = T温差4 -T 温差3 ;

[0042] Determine whether the second temperature difference change value ΔT2 is greater than the second temperature difference change threshold T. 阈值2 If so, control the air conditioner to exit the anti-condensation mode; otherwise, keep the air conditioner in the anti-condensation mode.

[0043] The method for determining whether to exit the anti-condensation mode in this implementation is the same as the method for determining whether to enter the anti-condensation mode. When the change in the temperature difference exceeds the change threshold, it is determined that the indoor air is no longer in a state of continuous high humidity, and the anti-condensation operation is exited in time. After exiting the anti-condensation mode, the indoor unit fan and compressor operate in the same state as before the anti-condensation control was executed.

[0044] In some implementations, the second temperature difference change threshold T 阈值2 The calculation methods include:

[0045] Establish T under high humidity conditions 温差 Data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH%.

[0046] Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L);

[0047] The second temperature difference threshold T is calculated using the following steps. 阈值2 :

[0048] T' 计算1 =F(RH%max-ΔRH%,f4,L4)-F(RH%max,f3,L3);

[0049] T' 计算2 =F(RH%max-2ΔRH%,f4,L4)-F(RH%max-ΔRH%,f3,L3);

[0050] T' 计算3 =F(RH%max-3ΔRH%,f4,L4)-F(RH%max-2ΔRH%,f3,L3);

[0051] …

[0052] T' 计算n-1 =F(RH%max-(n-1)ΔRH%,f4,L4)-F(RH%max-(n-2)ΔRH%,f3,L3);

[0053] T' 计算n=F(RH%min,f4,L4)-F(RH%max-(n-1)ΔRH%,f3,L3);

[0054] T 阈值2 =(T' 计算1 +T' 计算2 +T' 计算3 +…+T' 计算n-1 +T' 计算n ) / n+T 偏差 ;

[0055] Where f3 is the compressor frequency at time t3, L3 is the indoor unit fan speed at time t3, f4 is the compressor frequency at time t4, and L4 is the indoor unit fan speed at time t4.

[0056] RH%max is the set maximum humidity, ΔRH% is the set maximum humidity fluctuation, and RH%min is the set minimum humidity. RH%max - (n-1)ΔRH% > RH%min ≥ RH%max - nΔRH%, where n is a positive integer, and n = (RH%max - RH%min) / ΔRH%. T 偏差 To set the deviation.

[0057] The method for calculating the second temperature difference change threshold for exiting the anti-condensation working mode in this implementation is the same as the method for calculating the first temperature difference change threshold for entering and exiting the anti-condensation working mode. However, the second temperature difference change threshold takes into account a certain deviation to ensure that the anti-condensation working mode is exited only after the air humidity has decreased.

[0058] According to another aspect of the present invention, an air conditioner anti-condensation control device is provided, comprising a processor, a memory, and an anti-condensation control program stored in the memory and executable on the processor, wherein the anti-condensation control program, when executed by the processor, implements the above-described air conditioner anti-condensation control method.

[0059] The air conditioner anti-condensation control device of this application, by executing the above-mentioned air conditioner anti-condensation control method, can determine the indoor air humidity by the changes in the unit's own state parameters when the unit cannot obtain the indoor wet-bulb temperature, thereby achieving anti-condensation control, ensuring the reliability of unit operation, and improving customer satisfaction.

[0060] According to another aspect of the present invention, an air conditioner is provided, including the above-described air conditioner anti-condensation control device.

[0061] The air conditioner of this application, by adopting the aforementioned air conditioner anti-condensation control device, can accurately determine whether the current operating status of the unit and the environmental conditions may have caused condensation problems in the unit, and promptly execute preset anti-condensation operations and corresponding exit operations to reduce the occurrence of condensation problems in the unit and improve the user experience. Attached Figure Description

[0062] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0063] Figure 1 This is a schematic diagram of the structure of the air conditioner of the present invention;

[0064] Figure 2 The flowchart of the air conditioner anti-condensation control method of the present invention is as follows. Figure 1 ;

[0065] Figure 3 This is a flowchart illustrating the calculation of the first temperature difference change threshold of the present invention.

[0066] Figure 4 The control logic of the air conditioner anti-condensation control method of the present invention Figure 1 ;

[0067] Figure 5 The flowchart of the air conditioner anti-condensation control method of the present invention is as follows. Figure 2 ;

[0068] Figure 6 This is a flowchart illustrating the calculation of the second temperature difference change threshold of the present invention.

[0069] Figure 7 The control logic of the air conditioner anti-condensation control method of the present invention Figure 2 ;

[0070] in:

[0071] 1-Return air temperature sensor; 2-Gas-liquid separator; 3-Main unit heat exchanger; 4-Fan; 5-User side unit heat exchanger; 6-Four-way reversing valve; 7-Compressor; 8-Electronic expansion valve; 9-Pipe temperature sensor. Detailed Implementation

[0072] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0073] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” as used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0074] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] For existing heat pump units, when the indoor environment is in a high humidity state, the unit runs at high frequency for a long time, the evaporator tube temperature is low, and the high humidity indoor air is easily cooled and forms condensation when it passes through the evaporator. Under the action of the fan, the condensation will be blown out from the air duct, resulting in a bad customer experience.

[0076] Currently, the common practice for heat pump units is to detect indoor dry-bulb and wet-bulb temperatures using a thermostat or wet-bulb and dry-bulb sensors. These temperatures are then used to determine if there is a risk of condensation, and appropriate anti-condensation measures are taken. However, for units without communication thermostats or wet-bulb sensors, the unit cannot obtain indoor humidity parameters. Therefore, in the absence of indoor wet-bulb temperature information, how to identify whether the indoor environment is consistently high in humidity and then implement anti-condensation controls to prevent condensation remains a problem that needs to be solved.

[0077] Therefore, this application proposes an air conditioner anti-condensation control method, control device and air conditioner, which can determine whether the indoor air is in a state of continuous high humidity when the indoor wet-bulb temperature cannot be obtained, thereby achieving anti-condensation control.

[0078] Example 1

[0079] Figure 1 This is a schematic diagram of the air conditioner to which the method of this invention is applied. The main unit section mainly consists of a vapor-liquid separator 2, a main unit heat exchanger 3, a compressor 7, an electronic expansion valve 8, and a four-way reversing valve 6. The user-side unit mainly consists of a user-side unit heat exchanger 5, a pipe-mounted temperature sensor 9, a return air temperature sensor 1, and a fan 4.

[0080] Typically, the anti-condensation function is manifested in the cooling mode. In the cooling cycle, the high-temperature and high-pressure refrigerant gas discharged from the compressor 7 enters the main unit heat exchanger 3 through the four-way reversing valve 6. After releasing heat, it is condensed into refrigerant liquid. After passing through the electronic expansion valve 8 for throttling, it enters the user-side unit heat exchanger 5. Heat exchange takes place in the user-side unit heat exchanger 5, where it absorbs heat and evaporates into refrigerant gas. It then returns to the four-way reversing valve 6, enters the gas-liquid separator 2 for gas-liquid separation, and then returns to the compressor 7.

[0081] In cooling mode, the heat exchanger 5 on the user side unit is an evaporator, and the refrigerant temperature inside the evaporator is obtained as the pipe temperature T through the pipe temperature sensing bulb 9. 管 The evaporation temperature is the temperature within the system, while the return air temperature T can be obtained through the return air temperature sensor 1. 回 .

[0082] See Figure 2 The air conditioner anti-condensation control method of this embodiment includes the following steps:

[0083] Step S1: Obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 ;

[0084] Step S2: Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1;

[0085] Step S3: Calculate the first temperature difference change value ΔT1, where ΔT1 = T 温差2 -T 温差1 ;

[0086] Step S4: Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 If so, the air conditioner will enter the anti-condensation mode; otherwise, the air conditioner will not enter the anti-condensation mode.

[0087] The anti-condensation control method for air conditioners in this application is based on research using measured data. Tests have shown that when the unit is under long-term high humidity conditions, the indoor return air temperature T... 回 With the temperature T in the tubes of the evaporator 管 The temperature difference does not change much, that is, the T value before and after the unit changes.温差 The difference is not significant, meaning the temperature difference change ΔT is small; if the humidity decreases, the indoor return air temperature T 回 With the temperature T in the tubes of the evaporator 管 The temperature difference changes more, that is, the T value before and after the unit changes. 温差 The difference increases, meaning the temperature difference change ΔT increases. Therefore, when the temperature difference change ΔT before and after a given time is less than or equal to the temperature difference change threshold T... 阈值 If the unit is in a high humidity environment, it is considered that the unit needs to perform preset anti-condensation operations to reduce air conditioning condensation problems.

[0088] Therefore, the air conditioner anti-condensation control method of this application can determine the indoor air humidity by the changes in the unit's own state parameters when the unit cannot obtain the indoor wet-bulb temperature, thereby achieving anti-condensation control, ensuring the reliability of unit operation, and improving customer satisfaction.

[0089] See Figure 3 In some public disclosures, the first temperature difference change threshold T 阈值1 It can be calculated using the following method.

[0090] Establish T under high humidity conditions 温差 The data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH% is shown below:

[0091] 95％ 80 13 5 … … … … 65％ 80 13 2 … … … …

[0092] Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L), the specific fitting method is not limited in this embodiment, for example, polynomial fitting can be used.

[0093] Then, the first temperature difference change threshold T is calculated through the following steps. 阈值1 :

[0094] T 计算1 =F(RH%max-ΔRH%,f2,L2)-F(RH%max,f1,L1);

[0095] T 计算2 =F(RH%max-2ΔRH%,f2,L2)-F(RH%max-ΔRH%,f1,L1);

[0096] T 计算3 =F(RH%max-3ΔRH%,f2,L2)-F(RH%max-2ΔRH%,f1,L1);

[0097] …

[0098] T 计算n-1=F(RH%max-(n-1)ΔRH%,f2,L2)-F(RH%max-(n-2)ΔRH%,f1,L1);

[0099] T 计算n =F(RH%min,f2,L2)-F(RH%max-(n-1)ΔRH%,f1,L1);

[0100] T 阈值1 =(T 计算1 +T 计算2 +T 计算3 …+T 计算n-1 +T 计算n ) / n;

[0101] Where f1 is the compressor frequency at time t1, L1 is the indoor unit fan speed at time t1, f2 is the compressor frequency at time t2, and L2 is the indoor unit fan speed at time t2.

[0102] RH%max is the set maximum humidity, typically 100%. ΔRH% is the set maximum fluctuating humidity, which is the maximum humidity change value that the developer believes the unit can maintain under continuous high humidity conditions; it can be 10% or 15%. RH%min is the set minimum humidity, which is the maximum humidity that the developer believes there is no risk of condensation; it can be 60%. n is a positive integer, n = (RH%max - RH%min) / ΔRH%.

[0103] Thus, the calculated T 阈值1 The maximum value of the temperature difference change ΔT of the unit during the time period from t2 to t1 can be considered as the temperature difference change threshold. Compared with the experimental method to obtain the temperature difference change threshold, this embodiment uses a fitting calculation method, which does not require testing all possible combinations of humidity, frequency, and windshield. This can reduce the requirements for testing resources and time while ensuring accuracy.

[0104] In some publicly available information, the anti-condensation working mode can be achieved by lowering the indoor unit fan speed L to reduce the risk of blowing out condensation, or by lowering the compressor frequency f to reduce the generation of condensation, or by lowering the compressor frequency f while simultaneously lowering the indoor unit fan speed L.

[0105] In some publicly available information, after the air conditioner enters the anti-condensation working mode, it can also issue a high humidity alarm to remind users that the return air is continuously humid and to suggest closing doors and windows to avoid the unit being in a humid state for a long time.

[0106] In some publicly available methods, before conducting anti-condensation testing, it is first determined whether the unit has been operating at high frequency for an extended period. This is because prolonged high-frequency operation in a high-humidity environment increases the risk of condensation. Therefore, after the unit is started, the compressor frequency f is monitored in real time. If the compressor frequency f is continuously monitored for a preset time (e.g., 30 minutes), the test is successful. 阈值 (High-frequency setpoint, can be 65Hz), assuming the unit has been operating at high frequency for an extended period, then the indoor unit return air temperature T at time t1 is obtained again. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The steps.

[0107] In some publicly available reports, after the unit enters the anti-condensation operating mode, the running time of the anti-condensation operating mode is recorded in real time. When the running time is ≥t 预设 (For example, 30 minutes), control the air conditioner to exit the anti-condensation working mode, and the unit will operate in the state before the anti-condensation control was executed.

[0108] See Figure 4 The control logic of the air conditioner anti-condensation control method in this embodiment is as follows:

[0109] (1) The unit is turned on and set to cooling mode. The unit operates according to normal control logic.

[0110] (2) Real-time detection of compressor frequency f. If the compressor frequency f is continuously detected for a preset time (which can be 30 minutes) and the frequency is greater than or equal to f, the compressor frequency will be determined. 阈值 (High-frequency setpoint, can be 65Hz) If it is believed that the unit may have a risk of condensation due to long-term high-frequency operation, proceed to the next step; otherwise, the unit will operate according to the normal control logic.

[0111] (3) Obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 ;

[0112] (4) Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1;

[0113] (5) Calculate the first temperature difference change value ΔT1, where ΔT1 = T 温差2 -T 温差1 ;

[0114] (6) Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 That is, whether ΔT1≤T 阈值1 If yes, it is considered that the unit is in a high humidity environment and there is a risk of condensation. The unit will enter the anti-condensation working mode. If no, it is considered that the current environment of the unit is not a high humidity environment and the unit will operate according to the normal control logic.

[0115] (7) After entering the anti-condensation control, reduce the indoor unit fan speed L and compressor frequency f, and remind the user that the return air is continuously hot and suggest closing doors and windows.

[0116] (8) Determine whether the time for the unit to enter the anti-condensation working mode is ≥ t 预设 (For example, 30 minutes), if not, the unit remains in the current state; if yes, control the air conditioner to exit the anti-condensation working mode, the unit runs in the state before the anti-condensation control was executed, and returns to step (1).

[0117] Example 2

[0118] See Figure 2 and Figure 5 The air conditioner anti-condensation control method of this embodiment includes the following steps:

[0119] Step S1: Obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 ;

[0120] Step S2: Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1;

[0121] Step S3: Calculate the first temperature difference change value ΔT1, where ΔT1 = T 温差2 -T 温差1 ;

[0122] Step S4: Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 If yes, the air conditioner will enter the anti-condensation mode and proceed to the next step; otherwise, the air conditioner will not enter the anti-condensation mode.

[0123] Step S5: Obtain the indoor unit return air temperature T at time t3. 回3 and the temperature T in the evaporator tube of the indoor unit 管3 The third temperature difference value T is obtained. 温差3 , among which, T 温差3 =T 回3 -T 管3 ;

[0124] Step S6: Obtain the indoor unit return air temperature T at time t4. 回4 and the temperature T in the evaporator tube of the indoor unit 管4 The fourth temperature difference value T is obtained. 温差4 , among which, T 温差4 =T 回4 -T 管4 t4 > t3 > t2;

[0125] Step S7: Calculate the second temperature difference change value ΔT2, where ΔT2 = T 温差4 -T 温差3 ;

[0126] Step S8: Determine whether the second temperature difference change value ΔT2 is greater than the second temperature difference change threshold T. 阈值2 If so, control the air conditioner to exit the anti-condensation mode; otherwise, keep the air conditioner in the anti-condensation mode.

[0127] See Figure 3 First temperature difference threshold T 阈值1 It can be calculated using the following method.

[0128] Establish T under high humidity conditions 温差 The data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH% is shown below:

[0129] 95％ 80 13 5 … … … … 65％ 80 13 2 … … … …

[0130] Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L), the specific fitting method is not limited in this embodiment, for example, polynomial fitting can be used.

[0131] Then, the first temperature difference change threshold T is calculated through the following steps. 阈值1 :

[0132] T 计算1 =F(RH%max-ΔRH%,f2,L2)-F(RH%max,f1,L1);

[0133] T 计算2=F(RH%max-2ΔRH%,f2,L2)-F(RH%max-ΔRH%,f1,L1);

[0134] T 计算3 =F(RH%max-3ΔRH%,f2,L2)-F(RH%max-2ΔRH%,f1,L1);

[0135] …

[0136] T 计算n-1 =F(RH%max-(n-1)ΔRH%,f2,L2)-F(RH%max-(n-2)ΔRH%,f1,L1);

[0137] T 计算n =F(RH%min,f2,L2)-F(RH%max-(n-1)ΔRH%,f1,L1);

[0138] T 阈值1 =(T 计算1 +T 计算2 +T 计算3 …+T 计算n-1 +T 计算n ) / n;

[0139] Where f1 is the compressor frequency at time t1, L1 is the indoor unit fan speed at time t1, f2 is the compressor frequency at time t2, and L2 is the indoor unit fan speed at time t2.

[0140] RH%max is the set maximum humidity, usually 100%. RH%min is the set minimum humidity, which is the maximum humidity that the developer considers to be free of condensation risk, and can be 60%. ΔRH% is the set maximum fluctuating humidity, which is the maximum humidity change value that the developer considers to be under continuous high humidity conditions, and can be 10% or 15%. n is a positive integer, n = (RH%max - RH%min) / ΔRH%.

[0141] See Figure 6 The second temperature difference change threshold T 阈值2 It can be calculated using the following method:

[0142] T' 计算1 =F(RH%max-ΔRH%,f4,L4)-F(RH%max,f3,L3);

[0143] T' 计算2 =F(RH%max-2ΔRH%,f4,L4)-F(RH%max-ΔRH%,f3,L3);

[0144] T' 计算3=F(RH%max-3ΔRH%,f4,L4)-F(RH%max-2ΔRH%,f3,L3);

[0145] …

[0146] T' 计算n-1 =F(RH%max-(n-1)ΔRH%,f4,L4)-F(RH%max-(n-2)ΔRH%,f3,L3);

[0147] T' 计算n =F(RH%min,f4,L4)-F(RH%max-(n-1)ΔRH%,f3,L3);

[0148] T 阈值2 =(T' 计算1 +T' 计算2 +T' 计算3 +…+T' 计算n-1 +T' 计算n ) / n+T 偏差 ;

[0149] Where f3 is the compressor frequency at time t3, L3 is the indoor unit fan speed at time t3, f4 is the compressor frequency at time t4, and L4 is the indoor unit fan speed at time t4; T 偏差 The set deviation can be 2℃.

[0150] In some publicly available information, the anti-condensation working mode can be achieved by lowering the indoor unit fan speed L to reduce the risk of blowing out condensation, or by lowering the compressor frequency f to reduce the generation of condensation, or by lowering the compressor frequency f while simultaneously lowering the indoor unit fan speed L.

[0151] In some publicly available information, after the air conditioner enters the anti-condensation working mode, it can also issue a high humidity alarm to remind users that the return air is continuously humid and to suggest closing doors and windows to avoid the unit being in a humid state for a long time.

[0152] In some publicly available methods, before conducting anti-condensation testing, it is first determined whether the unit has been operating at high frequency for an extended period. This is because prolonged high-frequency operation in a high-humidity environment increases the risk of condensation. Therefore, after the unit is started, the compressor frequency f is monitored in real time. If the compressor frequency f is continuously monitored for a preset time (e.g., 30 minutes), the test is successful. 阈值 (High-frequency setpoint, can be 65Hz), assuming the unit has been operating at high frequency for an extended period, then the indoor unit return air temperature T at time t1 is obtained again. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The steps.

[0153] See Figure 7The control logic of the air conditioner anti-condensation control method in this embodiment is as follows:

[0154] (1) The unit is turned on and set to cooling mode. The unit operates according to normal control logic.

[0155] (2) Real-time detection of compressor frequency f. If the compressor frequency f is continuously detected for a preset time (which can be 30 minutes) and the frequency is greater than or equal to f, the compressor frequency will be determined. 阈值 (High-frequency setpoint, can be 65Hz) If it is believed that the unit may have a risk of condensation due to long-term high-frequency operation, proceed to the next step; otherwise, the unit will operate according to the normal control logic.

[0156] (3) Obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 =T 回1 -T 管1 ;

[0157] (4) Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 =T 回2 -T 管2 t2 > t1;

[0158] (5) Calculate the first temperature difference change value ΔT1, where ΔT1 = T 温差2 -T 温差1 ;

[0159] (6) Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 That is, whether ΔT1≤T 阈值1 If yes, it is considered that the unit is in a high humidity environment and there is a risk of condensation. The unit will enter the anti-condensation working mode. If no, it is considered that the current environment of the unit is not a high humidity environment and the unit will operate according to the normal control logic.

[0160] (7) After entering the anti-condensation control, reduce the indoor unit fan speed L and compressor frequency f, and remind the user that the return air is continuously hot and suggest closing doors and windows.

[0161] (8) Obtain the indoor unit return air temperature T at time t3. 回3 and the temperature T in the evaporator tube of the indoor unit 管3 The third temperature difference value T is obtained. 温差3 , among which, T 温差3 =T 回3 -T管3 ;

[0162] (9) Obtain the indoor unit return air temperature T at time t4. 回4 and the temperature T in the evaporator tube of the indoor unit 管4 The fourth temperature difference value T is obtained. 温差4 , among which, T 温差4 =T 回4 -T 管4 t4 > t3 > t2;

[0163] (10) The second temperature difference change value ΔT2 is calculated, where ΔT2 = T 温差4 -T 温差3 ;

[0164] (11) Determine whether the second temperature difference change value ΔT2 is greater than the second temperature difference change threshold T. 阈值2 That is, whether ΔT2>T is satisfied. 阈值2 If not, the unit is considered to still be in a high humidity state and the unit remains in the current state. If yes, the unit is considered to no longer be in a continuous high humidity state, the air conditioner is controlled to exit the anti-condensation working mode, the unit operates in the state before the anti-condensation control was executed, and returns to step (1).

[0165] Example 3

[0166] This embodiment discloses an air conditioner anti-condensation control method, including a processor, a memory, and an anti-condensation control program stored in the memory and executable on the processor. When the anti-condensation control program is executed by the processor, it implements the air conditioner anti-condensation control method described in any of the above embodiments.

[0167] The air conditioner anti-condensation control device in this embodiment, by executing the above-described air conditioner anti-condensation control method, can determine the indoor air humidity by the changes in the unit's own state parameters when the unit cannot obtain the indoor wet-bulb temperature, thereby achieving anti-condensation control, ensuring the unit's operational reliability, and improving customer satisfaction.

[0168] Example 4

[0169] This embodiment discloses an air conditioner, including the aforementioned air conditioner anti-condensation control device.

[0170] The air conditioner in this embodiment, by employing the aforementioned anti-condensation control device, can accurately determine whether the current operating status and environmental conditions of the unit may have caused condensation problems, and promptly execute preset anti-condensation operations and corresponding exit operations to reduce the occurrence of condensation problems and improve the user experience.

[0171] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0172] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0173] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preventing condensation in an air conditioner, characterized in that, include: Obtain the indoor unit return air temperature T at time t1 回1 and the temperature T in the evaporator tube of the indoor unit 管1 The first temperature difference value T is obtained. 温差1 , among which, T 温差1 = T 回1 - T 管1 ; Obtain the indoor unit return air temperature T at time t2. 回2 and the temperature T in the evaporator tube of the indoor unit 管2 The second temperature difference value T is obtained. 温差2 , among which, T 温差2 = T 回2 - T 管2 t2 > t1; The first temperature difference change value ΔT1 is calculated, where ΔT1 = T 温差2 - T 温差1 ; Determine whether the first temperature difference change value ΔT1 is less than or equal to the first temperature difference change threshold T. 阈值1 If so, the air conditioner will enter the anti-condensation mode; otherwise, the air conditioner will not enter the anti-condensation mode. The first temperature difference change threshold T 阈值1 The calculation methods include: Establish T under high humidity conditions 温差 Data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH%. Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L); The first temperature difference threshold T is calculated using the following steps. 阈值1 : T 计算1 =F(RH%max-ΔRH%,f2,L2)-F(RH%max,f1,L1); T 计算2 =F(RH%max-2ΔRH%,f2,L2)-F(RH%max-ΔRH%,f1,L1); T 计算3 =F(RH%max-3ΔRH%,f2,L2)-F(RH%max-2ΔRH%,f1,L1); … T 计算n-1 = F(RH%max-(n-1)ΔRH%,f2,L2)-F(RH%max-(n-2)ΔRH%,f1,L1); T 计算n =F(RH%min,f2,L2)-F(RH%max-(n-1) ΔRH%,f1,L1); T 阈值1 =( T 计算1 + T 计算2 + T 计算3 +…+T 计算n-1 + T 计算n ) / n; Where f1 is the compressor frequency at time t1, L1 is the indoor unit fan speed at time t1, f2 is the compressor frequency at time t2, and L2 is the indoor unit fan speed at time t2. RH%max is the set maximum humidity, ΔRH% is the set maximum fluctuation humidity, and RH%min is the set minimum humidity. RH%max-(n-1)ΔRH%>RH%min≥RH%max-nΔRH%, where n is a positive integer, and n=(RH%max -RH%min) / ΔRH%.

2. The air conditioner anti-condensation control method according to claim 1, characterized in that, The anti-condensation working mode includes reducing the indoor unit fan speed L and / or reducing the compressor frequency f.

3. The air conditioner anti-condensation control method according to claim 1, characterized in that, After the air conditioner enters the anti-condensation working mode, the following is also included: Issues a high humidity alarm for the indoor environment.

4. The air conditioner anti-condensation control method according to claim 1, characterized in that, The indoor unit return air temperature T at time t1 is obtained. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 Previously, it also included: Obtain the compressor frequency within a continuous preset time period; Determine whether the compressor frequency within the continuous preset time period is greater than or equal to the high-frequency threshold. If so, proceed to obtain the indoor unit return air temperature T at time t1. 回1 and the temperature T in the evaporator tube of the indoor unit 管1 Steps; If not, repeat the step of obtaining the compressor frequency within a continuous preset time period.

5. The air conditioner anti-condensation control method according to claim 1, characterized in that, After the air conditioner enters the anti-condensation working mode, the following is also included: If the air conditioner remains in anti-condensation mode for longer than the preset time, the air conditioner will exit anti-condensation mode.

6. The air conditioner anti-condensation control method according to claim 1, characterized in that, After the air conditioner enters the anti-condensation working mode, the following is also included: Obtain the indoor unit return air temperature T at time t3. 回3 and the temperature T in the evaporator tube of the indoor unit 管3 The third temperature difference value T is obtained. 温差3 , among which, T 温差3 = T 回3 - T 管3 ; Obtain the indoor unit return air temperature T at time t4. 回4 and the temperature T in the evaporator tube of the indoor unit 管4 The fourth temperature difference value T is obtained. 温差4 , among which, T 温差4 = T 回4 - T 管4 t4 > t3 > t2; The second temperature difference change value ΔT2 is calculated, where ΔT2 = T 温差4 - T 温差3 ; Determine whether the second temperature difference change value ΔT2 is greater than the second temperature difference change threshold T. 阈值2 If so, control the air conditioner to exit the anti-condensation mode; otherwise, keep the air conditioner in the anti-condensation mode.

7. The air conditioner anti-condensation control method according to claim 6, characterized in that, The second temperature difference change threshold T 阈值2 The calculation methods include: Establish T under high humidity conditions 温差 Data table for compressor frequency f, indoor unit fan speed L, and indoor relative humidity RH%. Based on the data table, the following relationship is fitted: T 温差 =F(RH%,f,L); The second temperature difference threshold T is calculated using the following steps. 阈值2 : T’ 计算1 =F(RH%max-ΔRH%,f4,L4)-F(RH%max,f3,L3); T’ 计算2 =F(RH%max-2ΔRH%,f4,L4)-F(RH%max-ΔRH%,f3,L3); T’ 计算3 =F(RH%max-3ΔRH%,f4,L4)-F(RH%max-2ΔRH%,f3,L3); … T’ 计算n-1 = F(RH%max-(n-1)ΔRH%,f4,L4)-F(RH%max-(n-2)ΔRH%,f3,L3); You 计算n =F(RH%min,f4,L4)-F(RH%max-(n-1) ΔRH%,f3,L3); T 阈值2 =( T’ 计算1 + T’ 计算2 + T’ 计算3 +…+T’ 计算n-1 + T’ 计算n ) / n+T 偏差 ; Where f3 is the compressor frequency at time t3, L3 is the indoor unit fan speed at time t3, f4 is the compressor frequency at time t4, and L4 is the indoor unit fan speed at time t4. RH%max is the set maximum humidity, ΔRH% is the set maximum humidity fluctuation, and RH%min is the set minimum humidity. RH%max-(n-1)ΔRH%>RH%min≥RH%max-nΔRH%, where n is a positive integer, and n=(RH%max -RH%min) / ΔRH%, T 偏差 To set the deviation.

8. An anti-condensation control device for an air conditioner, characterized in that, It includes a processor, a memory, and an anti-condensation control program stored in the memory and executable on the processor, wherein the anti-condensation control program, when executed by the processor, implements the air conditioner anti-condensation control method as described in any one of claims 1-7.

9. An air conditioner, characterized in that, Includes the air conditioner anti-condensation control device as described in claim 8.

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