WO2021223478A1

WO2021223478A1 - Air conditioning unit and defrosting control method thereof

Info

Publication number: WO2021223478A1
Application number: PCT/CN2021/075559
Authority: WO
Inventors: 张宝库; 鞠聪; 韩伟涛; 毛守博
Original assignee: 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2020-05-29
Filing date: 2021-02-05
Publication date: 2021-11-11
Also published as: CN111854058A

Abstract

An air conditioning unit and a defrosting control method thereof. The defrosting control method comprises: obtaining meteorological parameters of the area where an air conditioning unit is located and unit operating state parameters (S100); integrating meteorological parameters and unit operating state parameters of each day according to different time periods (S200); determining the average values of the parameters in different time periods each day within a fixed duration (S300); using the average values as reference values to compare with the current value of each parameter (S400); and selectively activating a defrosting mode of the air conditioning unit according to the comparison results (S500). In the present method, big data analysis and integration processing is performed on the meteorological parameters of the area where an air conditioning unit is located and the unit operating state parameters as reference values to compare with the current values of the parameters obtained in real time, such that the effect of use frequency on the reference values is eliminated, and the air conditioning unit can be accurately defrosted in different time periods, thereby solving the problem of misjudgment in the prior art and improving defrosting effect.

Description

Air conditioning unit and its defrosting control method

Technical field

The invention belongs to the technical field of air conditioners, and specifically provides an air conditioner unit and a defrosting control method thereof.

Background technique

During the operation of the air-conditioning unit, the heat exchanger exchanges heat with the air. In the low-ambient temperature heating process, especially around 0℃, when the evaporation temperature is lower than the dew point temperature in the air, the surface of the evaporator of the unit will perform different degrees. The frosting increases the heat transfer resistance of the heat exchanger, increases the air flow resistance, and reduces the heat transfer coefficient, resulting in poor performance of the heat exchanger. For this reason, the current heating reverse cycle method is used to defrost the evaporator, that is, the working mode of the air conditioning unit is switched from the heating mode to the cooling mode to defrost the evaporator.

The Chinese invention patent with publication number CN110848883A discloses a control method for air conditioner defrosting. The control method includes: S110, real-time acquisition of the operating parameters of the air conditioning unit, wherein the operating parameters of the air conditioning unit include: the outdoor temperature of the air conditioning unit, The fin temperature of the air-conditioning unit, the compressor line pressure value of the air-conditioning unit, and the temperature of the outer coil of the air-conditioning unit; S120. Determine whether the air-conditioning unit meets the defrosting conditions: the outdoor temperature of the air-conditioning unit minus the temperature of the air-conditioning unit The fin temperature difference is greater than or equal to the preset temperature difference; the compressor pipeline pressure value of the air conditioning unit is less than a first preset pressure value; the outer coil temperature is less than or equal to the first preset temperature. S130: When the air conditioner unit meets the defrosting condition, control to turn on the air conditioner defrost function, and the air conditioner unit enters a cooling mode for defrosting.

When determining whether the defrosting conditions are met, the reference value compared with each parameter is preset in the controller when the air conditioner defrosting control method is used. As the frequency of use increases, certain performance parameters in the air conditioning unit There will also be attenuation. If you continue to use the factory preset value as a reference value to determine whether the defrosting conditions are met, there may be a misjudgment problem, which will affect the defrosting effect.

Therefore, those skilled in the art need to provide a new air conditioner defrosting control method to solve the problem of misjudgment existing in the existing air conditioner defrosting control method, so as to improve the defrosting effect.

Summary of the invention

In order to solve the problem of misjudgment existing in the existing air conditioner defrosting control method, the present invention provides a defrosting control method for an air conditioner unit.

The defrosting control method of the air-conditioning unit of the present invention includes: obtaining the meteorological parameters and unit operating state parameters of the air-conditioning unit; classifying and integrating the daily meteorological parameters and the unit operating state parameters according to different time periods; determining one The average value of the meteorological parameter and the average value of the unit operating state parameter in the different time periods during a fixed period; compare the current value of the meteorological parameter and the average value of the meteorological parameter and the average value of the meteorological parameter in the same period The magnitude relationship between the current value of the unit operating state parameter and the average value of the unit operating state parameter; according to the comparison result, the defrost mode of the air conditioning unit is selectively activated.

A preferred solution of the aforementioned defrost control method is that the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include at least two of unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature.

The preferred solution of the above defrosting control method is that the step of "selectively starting the defrosting mode of the air conditioning unit based on the comparison result" includes: when the comparison result satisfies at least one of the following conditions (1) and satisfies the following conditions ( 2) when the defrosting mode of the air conditioning unit is activated; condition (1): the current value of the ambient temperature is less than the average value of the ambient temperature, and the current value of the ambient humidity is greater than the The average value of the ambient humidity; condition (2): the current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, the current value of the unit operating low pressure is less than the average value of the unit operating low pressure, so The current value of the fan current is greater than the average value of the fan current, and the current value of the defrost sensor temperature is less than the average value of the defrost sensor temperature.

The preferred solution of the above-mentioned defrosting control method is that the step of "obtaining the meteorological parameters and unit operating state parameters of the air conditioning unit" also includes: obtaining the target temperature set by the user during the unit operation and the unit outlet water during the unit operation Temperature; "classify and integrate the daily meteorological parameters and the unit operating state parameters according to different time periods" also includes: classify and integrate the daily target temperature and the unit outlet water temperature according to different time periods; "determine a fixed period The step of "average value of the meteorological parameter and average value of the unit operating state parameter for each day in the different time period" also includes: determining the average value of the target temperature for each day in the different time period in a fixed time period ; "Compare the current value of the meteorological parameter in the same period of time with the average value of the meteorological parameter and the magnitude relationship between the current value of the unit operating state parameter and the average value of the unit operating state parameter" It includes: comparing the magnitude relationship between the current value of the outlet water temperature of the unit and the average value of the target temperature.

A preferred solution of the above defrost control method is that the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include at least two of unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature.

The preferred solution of the above defrost control method is that the step of "selectively starting the defrost mode of the air conditioning unit based on the comparison result" includes: when the comparison result satisfies at least one of the conditions (1) and satisfies the condition (2) The defrosting mode of the air conditioning unit is activated under at least two conditions of, condition (1): the current value of the ambient temperature is less than the average value of the ambient temperature, and the current value of the ambient humidity is greater than the ambient humidity The current value of the outlet water temperature of the unit is less than the average value of the target temperature; condition (2): the current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, and the unit is running The current value of the low pressure is less than the average value of the operating low pressure of the unit, the current value of the fan current is greater than the average value of the fan current, and the current value of the defrost sensor temperature is less than the average value of the defrost sensor temperature.

The preferred solution of the above-mentioned defrosting control method is that in the step of "classifying and integrating the daily meteorological parameters and the unit operating state parameters according to different time periods", the method for determining the different time periods is: 24 o'clock-5 o'clock, 5 o'clock -9 o'clock, 9 o'clock -12 o'clock, 12 o'clock -17 o'clock, 17:00 -21 o'clock, 21 o'clock -24 o'clock.

The preferred solution of the above-mentioned defrost control method is that in the step of "determining the average value of the meteorological parameters and the average value of the unit operating state parameters in the different time periods in a fixed period of time", a fixed period of time is One week, one month or one quarter.

The preferred solution of the above-mentioned defrosting control method is that the step of "obtaining the meteorological parameters and unit operating status parameters of the air conditioning unit" includes: obtaining the meteorological parameters and unit operating status of the air conditioning unit from a cloud server parameter.

The defrosting control method of an air-conditioning unit of the present invention includes: obtaining meteorological parameters and unit operating state parameters of the air-conditioning unit; classifying and integrating daily meteorological parameters and unit operating state parameters according to different time periods; determining the location within a fixed period of time. Describe the average values of daily meteorological parameters and unit operating state parameters in different time periods; compare the current values of meteorological parameters and the average values of meteorological parameters in the same time period and the current values of unit operating state parameters with the unit operating state parameters The size relationship between the average value of the air conditioner; according to the comparison result, the defrost mode of the air conditioning unit is selectively activated.

Compared with the prior art, the defrost control method of the present invention performs big data analysis and integration processing on the meteorological parameters and the operating state parameters of the air-conditioning unit, and calculates the average of the relevant parameters of each day in a fixed period of time. The value is used as a reference value, compared with the current value of the parameter obtained in real time, and then the defrosting module of the air conditioning unit is selectively activated according to the comparison result to perform precise defrosting at different periods of time, eliminating the influence of frequency of use on the reference value. Therefore, the misjudgment problem in the existing air conditioner defrosting control method is solved, and the defrosting effect is improved.

In another aspect, the present invention also provides an air conditioning unit including a controller configured to execute the above-mentioned defrosting control method. Those skilled in the art can understand that the air conditioning unit has all the technical effects of the aforementioned defrosting control method.

Description of the drawings

Figure 1 is a flow chart of the main steps of the defrosting control method of the air conditioning unit of the present invention in an embodiment;

Figure 2 is a detailed step flow chart of the defrosting control method of the air conditioning unit of the present invention in an embodiment;

3 is a flowchart of the main steps of the defrosting control method of the air conditioning unit of the present invention in another embodiment;

Figure 4 is a detailed step flow chart of the defrosting control method of the air conditioning unit of the present invention in another embodiment;

Fig. 5 is a structural block diagram of the air conditioning unit of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

In the description of this application, "controller" may include hardware, software, or a combination of both. A module can include hardware circuits, various suitable sensors, communication ports, and memory, and can also include software parts, such as program codes, or a combination of software and hardware.

Referring to Fig. 1, in an embodiment, the defrosting control method of the air conditioning unit of the present invention mainly includes:

Step S100: Obtain meteorological parameters and operating state parameters of the air-conditioning unit where the air-conditioning unit is located.

Among them, the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include at least two of the unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature. It should be noted that the step of "obtaining the meteorological parameters and operating state parameters of the air conditioning unit" includes: obtaining the meteorological parameters and operating state parameters of the air conditioning unit from the cloud server. Of course, the step of "obtaining the meteorological parameters and operating state parameters of the air conditioning unit" may also include: obtaining the meteorological parameters and operating state parameters of the air conditioning unit where the air conditioning unit is located from a local server.

Step S200: Classify and integrate daily meteorological parameters and unit operating status parameters according to different time periods.

For ease of understanding, Table 1 is used to illustrate how to classify and integrate daily meteorological parameters and unit operating status parameters according to different time periods. The different time periods in a day in Table 1 are divided in a 24-hour system. It can be understood that Table 1 is only an example of the division of time periods, and this specific division method does not limit the protection scope of the present invention.

Table 1

It should be noted that two meteorological parameters and four unit operating parameters are listed in Table 1. According to the requirements of subsequent steps, the defrost control method of the present invention must include at least one meteorological parameter and two unit operating parameters, for example: The parameters can be ambient temperature or ambient humidity. The unit operating parameters can be unit operating frequency and unit operating low voltage, unit operating low voltage and fan current, fan current and defrost sensor temperature, etc., as long as the above four are included. Two of the unit operating parameters are sufficient, of course, four unit operating parameters can also be included.

Step S300: Determine the average value of the daily meteorological parameters and the average value of the unit operating state parameters in the different time periods in a fixed period.

Among them, a fixed period can be a week, a month, or a quarter. For ease of understanding, a month (30 days) is used as an example to illustrate in Table 2 to determine the average value of the meteorological parameters for each day in the different time periods. And the average value of the operating state parameters of the unit.

Table 2

Determining the average value of the daily meteorological parameters in the different time periods in a month means that the sum of the meteorological parameters in the same time period within 30 days is divided by 30 to obtain the quotient. Similarly, the average value of the operating parameters of each unit can be obtained. No longer.

Step S400: Compare the magnitude relationship between the current value of the meteorological parameter and the average value of the meteorological parameter in the same time period, and the current value of the unit operating state parameter and the average value of the unit operating state parameter.

Step S500: According to the comparison result, the defrost mode of the air conditioning unit is selectively activated.

It should be noted that the aforementioned meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include at least two of the unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature. When different meteorological parameters and unit operating modes are used, the specific comparison objects in step S400 are also different.

In detail, in step S500 of "selectively activate the defrosting mode of the air conditioning unit based on the comparison result", when the comparison result satisfies at least one of the following conditions (1) and satisfies at least two of the following conditions (2) When the time, the defrost mode of the air conditioning unit is activated.

Among them, the condition (1) is: the current value of the ambient temperature is less than the average value of the ambient temperature, and the current value of the ambient humidity is greater than the average value of the ambient humidity.

Condition (2) is: the current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, the current value of the unit operating low pressure is less than the average value of the unit operating low pressure, the current value of the fan current is greater than the average value of the fan current, defrost The current value of the sensor temperature is less than the average value of the defrost sensor temperature.

In order to facilitate a better understanding of the defrost control method of this embodiment, the following takes the ambient temperature as the meteorological parameter, and the unit operating frequency and the unit operating low pressure as the unit operating state parameters as examples. The defrosting control method of the present invention will be described in detail with reference to FIG. 2. The detailed steps of the frost control method.

Referring to Fig. 2, the defrosting control method of this embodiment includes in detail:

Step S100', obtaining the ambient temperature, the operating frequency of the air-conditioning unit, and the operating low pressure of the air-conditioning unit;

Step S200', classify and integrate daily ambient temperature, unit operating frequency and unit operating low pressure according to different time periods;

Step S300', determining the average value of daily ambient temperature, the average value of unit operating frequency and the average value of unit operating low pressure in the different time periods within a fixed period;

Step S400', compare the current value of the ambient temperature and the average value of the ambient temperature in the same time period, the current value of the unit operating frequency and the average value of the unit operating frequency, and the current value of the unit operating low pressure and the average value of the unit operating low pressure. Size relationship

Step S500', if the current value of the ambient temperature is less than the average value of the ambient temperature, and the current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, and the current value of the unit operating low pressure is less than the average value of the unit operating low pressure, then Go to step S600'.

Step S600', start the defrost mode of the air conditioning unit.

It should be noted that the detailed steps of the defrosting control method of the present invention are different according to the selected meteorological parameters and the operating state parameters of the unit. However, no matter which meteorological parameters and operating state parameters of the unit are selected, the details of the defrosting control method are None of the steps deviate from the main steps of the defrost control method of the present invention shown in FIG. 1. For specific operations, those skilled in the art can adjust the relevant parameters according to the example in FIG. 2. Under the condition that the defrosting mode is activated, the defrosting control method of the present invention covers all combinations of condition (1) and condition (2).

Referring to Fig. 3, on the basis of the foregoing embodiment, the defrost control method of another embodiment of the present invention mainly includes:

Step S100": Obtain the meteorological parameters of the location where the air conditioning unit is located, the operating state parameters of the unit, the target temperature set by the user during the operation of the unit, and the outlet water temperature of the unit.

Among them, the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include at least two of the unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature. It should be noted that step S100" includes: obtaining from the cloud server the meteorological parameters of the air-conditioning unit, the operating status parameters of the unit, the target temperature set by the user when the unit is running, and the outlet water temperature of the unit. Of course, step S100" also It may include: obtaining the meteorological parameters and the operating state parameters of the air-conditioning unit where the air-conditioning unit is located from a local server.

Step S200", classify and integrate daily meteorological parameters, unit operating status parameters, target temperature set by the user during unit operation, and unit outlet water temperature according to different time periods.

Also for ease of understanding, Table 3 is used to illustrate how to classify and integrate daily meteorological parameters, unit operating status parameters, target temperature set by the user during unit operation, and unit outlet water temperature according to different time periods. The different time periods in a day in Table 3 are divided in a 24-hour system. It is understandable that Table 3 is only an example to illustrate the division of time periods, and this specific division method does not limit the protection scope of the present invention.

table 3

Step S300": Determine the average value of the meteorological parameters, the average value of the unit operating state parameters, and the average value of the target temperature in the different time periods within a fixed period of time.

Similarly, for ease of understanding, let's take one month (30 days) as an example in conjunction with Table 4 to illustrate the determination of the average value of the meteorological parameters, the average value of the unit operating state parameters, and the average value of the target temperature during the different time periods. .

Table 4

Step S400", compare the current value of the meteorological parameter with the average value of the meteorological parameter during the same period The size relationship.

Step S500", according to the comparison result, selectively activate the defrosting mode of the air conditioning unit.

It should be noted that, in addition to the meteorological parameters and unit operating parameters in the previous embodiment, the comparison parameters in this embodiment also include the target temperature set by the user and the unit outlet water temperature during unit operation, and the meteorological parameters include ambient temperature and/ Or ambient humidity, the unit operating parameters include at least two of the unit operating frequency, unit operating low pressure, fan current and defrost sensor temperature.

In detail, in this embodiment, the step S400 of “selectively start the defrosting mode of the air conditioning unit based on the comparison result” includes: when the comparison result meets at least one of the conditions (1) and meets at least one of the conditions (2) Under the two conditions, enter step S500" to start the defrost mode of the air conditioning unit.

Among them, the condition (1) is: the current value of the ambient temperature is less than the average value of the ambient temperature, the current value of the ambient humidity is greater than the average value of the ambient humidity, and the unit outlet water temperature when the unit is running is less than the average value of the target temperature.

Similarly, in order to facilitate a better understanding of the defrost control method of this embodiment, the following takes the ambient temperature as the meteorological parameter, and the unit operating frequency and the unit operating low pressure as the unit operating state parameters as examples. The present invention will be described in detail with reference to FIG. 4 The detailed steps of the defrost control method.

Referring to Fig. 4, the defrosting control method of this embodiment includes in detail:

Step S100"": Obtain the ambient temperature of the air conditioning unit, the operating frequency of the unit, the operating low pressure of the unit, the target temperature set by the user during the operation of the unit, and the outlet water temperature of the unit;

Step S200", classify and integrate daily ambient temperature, unit operating frequency, unit operating low pressure, target temperature and unit outlet water temperature according to different time periods;

Step S300"": Determine the average value of the daily ambient temperature, the average value of the unit operating frequency, the average value of the unit operating low pressure, and the average value of the target temperature in the different time periods within a fixed period;

Step S400", compare the current value of the ambient temperature and the average value of the ambient temperature in the same time period, the current value of the unit operating frequency and the average value of the unit operating frequency, the current value of the unit operating low pressure and the average value of the unit operating low pressure and the unit The relationship between the current value of the outlet water temperature and the average value of the target temperature;

Step S500"'. If the current value of the ambient temperature is less than the average value of the ambient temperature, and the current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, and the current value of the unit operating low pressure is less than the average value of the unit operating low pressure, the unit When the current value of the outlet water temperature is less than the average value of the target temperature, step S600"" is entered.

Step S600"", start the defrosting mode of the air conditioning unit.

It should be noted that the detailed steps of the defrosting control method of the present invention are different according to the selected meteorological parameters and the operating state parameters of the unit. However, no matter which meteorological parameters and operating state parameters of the unit are selected, the details of the defrosting control method are None of the steps deviate from the main steps of the defrost control method of the present invention shown in FIG. 3. For specific operations, those skilled in the art can adjust the relevant parameters according to the example in FIG. 4. Under the condition that the defrosting mode is activated, the defrosting control method of the present invention covers all the combinations of condition (1) and condition (2).

In addition, the present invention also provides an air conditioning unit including a controller configured to execute the cloud processing defrosting method described above.

Based on the implementation of the defrost control method of the air conditioning unit of the first embodiment in FIG. 1, refer to the structural block diagram of the air conditioning unit of the present invention in FIG. Acquisition module, information integration module, information analysis module, information storage module and information feedback module.

Among them, the information collection module is used to collect the meteorological parameters and operating status parameters of the unit where the unit is located, and transmit the data to the data storage module in real time.

The information integration module is used to classify and integrate the information transmitted by the information collection module according to different time periods, and then pass it to the information analysis module.

The information analysis module is used to determine the average value of the daily meteorological parameters and the average value of the unit operating state parameters in the different time periods in a fixed period, and compare the current value of the meteorological parameters in the same time period with the average value of the meteorological parameters, and the unit operation The magnitude relationship between the current value of the status parameter and the average value of the unit's operating status parameter, and then the comparison result is sent to the information storage module for archiving.

The information feedback module calls the comparison result of the information storage module and feeds it back to the defrost control module, and the defrost control module selectively activates the defrost mode of the air conditioning unit according to the comparison structure.

Similarly, based on the implementation of the defrosting control method of the air conditioning unit of the second embodiment of FIG. 3, the air conditioning unit of the present invention also includes a controller. The controller includes a defrost control module, an information collection module, an information integration module, and information Analysis module, information storage module and information feedback module.

Among them, the information collection module is used to obtain the meteorological parameters of the air conditioning unit, the operating state parameters of the unit, the target temperature set by the user during the operation of the unit, and the outlet water temperature of the unit.

The information analysis module is used to determine the average value of the meteorological parameters, the average value of the unit operating state parameters and the average value of the target temperature in the different time periods in a fixed period, and compare the current values of the meteorological parameters and the meteorological parameters in the same period The relationship between the current value of the unit operating state parameter and the average value of the unit operating state parameter and the current value of the unit outlet water temperature and the average value of the target temperature, and then the comparison result is archived to the information storage module.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A defrost control method for an air conditioning unit, characterized in that the defrost control method includes:

Acquiring the meteorological parameters and operating state parameters of the air-conditioning unit where the air-conditioning unit is located;

Classification and integration of the daily meteorological parameters and the operating state parameters of the unit according to different time periods;

Determining the average value of the meteorological parameters and the average value of the unit operating state parameters in the different time periods in a fixed period;

Comparing the current value of the meteorological parameter and the average value of the meteorological parameter in the same time period and the magnitude relationship between the current value of the unit operating state parameter and the average value of the unit operating state parameter;

According to the comparison result, the defrost mode of the air conditioning unit is selectively activated.
The defrost control method according to claim 1, wherein the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature At least two of them.
The defrosting control method according to claim 2, wherein the step of "selectively starting the defrosting mode of the air conditioning unit based on the comparison result" comprises: when the comparison result meets at least one of the following conditions (1) When the conditions are met and at least two of the following conditions (2) are met, the defrost mode of the air conditioning unit is activated;

Condition (1): the current value of the environmental temperature is less than the average value of the environmental temperature, and the current value of the environmental humidity is greater than the average value of the environmental humidity;

Condition (2): The current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, the current value of the unit operating low pressure is less than the average value of the unit operating low voltage, and the current value of the fan current Greater than the average value of the fan current, the current value of the defrost sensor temperature is less than the average value of the defrost sensor temperature.
The defrost control method according to claim 1, wherein the step of "obtaining the meteorological parameters and the operating state parameters of the air conditioning unit where the air conditioning unit is located" further comprises: obtaining the target temperature and the target temperature set by the user during the operation of the air conditioning unit. The outlet water temperature of the unit during operation;

The step of "classifying and integrating the daily meteorological parameters and the unit operating state parameters according to different time periods" also includes: classifying and integrating the daily target temperature and the unit outlet water temperature according to different time periods;

The step of "determining the average value of the meteorological parameters and the average value of the unit operating state parameters for the different time periods in a fixed period of time" also includes: determining the average value of the meteorological parameters for each day in the different period of time in a fixed period of time. The average value of the target temperature;

The step of "comparing the current value of the meteorological parameter and the average value of the meteorological parameter in the same time period and the magnitude relationship between the current value of the unit operating state parameter and the average value of the unit operating state parameter" also includes : Compare the magnitude relationship between the current value of the outlet water temperature of the unit and the average value of the target temperature.
The defrost control method according to claim 4, wherein the meteorological parameters include ambient temperature and/or ambient humidity, and the unit operating parameters include unit operating frequency, unit operating low pressure, fan current, and defrost sensor temperature At least two of them.
The defrosting control method according to claim 5, wherein the step of "selectively starting the defrosting mode of the air conditioning unit based on the comparison result" comprises: when the comparison result satisfies at least one of the conditions (1) And when at least two conditions of condition (2) are met, start the defrost mode of the air conditioning unit;

Condition (1): The current value of the ambient temperature is less than the average value of the ambient temperature, the current value of the ambient humidity is greater than the average value of the ambient humidity, and the current value of the outlet water temperature of the unit is less than the target temperature average of;

Condition (2): The current value of the unit operating frequency is greater than or equal to the average value of the unit operating frequency, the current value of the unit operating low pressure is less than the average value of the unit operating low voltage, and the current value of the fan current Greater than the average value of the fan current, the current value of the defrost sensor temperature is less than the average value of the defrost sensor temperature.
The defrosting control method according to any one of claims 1 to 6, characterized in that, in the step of "classifying and integrating the meteorological parameters and the unit operating state parameters of each day according to different time periods", different time periods The determination method is: 24 o'clock-5 o'clock, 5 o'clock-9 o'clock, 9 o'clock-12 o'clock, 12 o'clock-17 o'clock, 17 o'clock-21 o'clock, 21 o'clock-24 o'clock).
The defrosting control method according to any one of claims 1 to 6, characterized in that, in a fixed period of time, the average value of the meteorological parameters and the operating state parameters of the unit in the different periods of the day are determined In the step of "average value", a fixed period is one week, one month or one quarter.
The defrosting control method according to claim 1, wherein the step of "obtaining the meteorological parameters and operating state parameters of the air conditioning unit where the air conditioning unit is located" comprises:

Obtain the meteorological parameters and the operating state parameters of the air-conditioning unit where the air-conditioning unit is located from the cloud server.
An air conditioning unit, comprising a controller, characterized in that the controller is configured to be able to execute the defrosting control method according to any one of claims 1 to 9.