CN-122015232-A - Defrosting control method and system based on COP attenuation rate, air conditioner and medium

CN122015232ACN 122015232 ACN122015232 ACN 122015232ACN-122015232-A

Abstract

The application discloses a defrosting control method, a defrosting control system, an air conditioner and a medium based on COP attenuation rate, wherein the method comprises the steps of collecting the rotating speed of an indoor fan, the temperature of an indoor coil pipe and the consumption power; according to the rotating speed of the indoor fan, the temperature of the indoor coil pipe and the power consumption, a COP average value and a COP maximum value are obtained through calculation, a COP attenuation rate is obtained through calculation according to the COP average value and the COP maximum value, and the air conditioner is controlled to enter a primary defrosting mode, a secondary defrosting mode or a reversing defrosting mode according to the COP attenuation rate. The application can accurately determine the defrosting time, solves the problem that hysteresis exists in defrosting and affects the comfort level of users, and can be widely applied to the technical field of air conditioners.

Inventors

JIN MIN
CHEN JIA
ZENG PAN

Assignees

安徽恩博力电器有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. The defrosting control method based on the COP attenuation rate is characterized by comprising the following steps of: collecting the rotating speed of an indoor fan, the temperature of an indoor coil pipe and the consumption power; Calculating to obtain a COP average value and a COP maximum value according to the rotating speed of the indoor fan, the temperature of the indoor coil pipe and the consumed power; According to the COP average value and the COP maximum value, calculating to obtain a COP attenuation rate; And controlling the air conditioner to enter a primary frost suppression mode, a secondary frost suppression mode or a reversing defrosting mode according to the COP attenuation rate.
2. The method according to claim 1, wherein the calculating the COP mean value and the COP maximum value according to the indoor fan rotation speed, the indoor coil temperature and the consumed power specifically includes: Constructing a rotating speed-air volume linear model, and inputting the rotating speed of the indoor fan into the rotating speed-air volume linear model to obtain an air volume value; calculating to obtain a virtual capacity value according to the air quantity value and the indoor coil temperature; calculating to obtain a COP value according to the virtual capacity value and the consumed power; Calculating the average value of the COP value in the detection period to obtain the average value of the COP value; and obtaining the maximum COP value from the starting operation of the air conditioner to the COP attenuation period according to the COP value.
3. The method according to claim 1, wherein the calculating the COP attenuation rate according to the COP average value and the COP maximum value specifically includes: Performing difference operation on the COP average value and the COP maximum value; performing division operation on the difference obtained by the difference operation and the COP maximum value to obtain the COP attenuation rate; the calculation formula of the COP attenuation rate is as follows: ; Wherein, the For the COP decay rate in question, As a result of the COP mean value, Is the COP maximum.
4. The method according to claim 1, wherein the controlling the air conditioner to enter a primary frost suppression mode, a secondary frost suppression mode or a reversing frost suppression mode according to the COP attenuation rate specifically comprises: Collecting the temperature of an outdoor coil pipe and the temperature of an outdoor environment; When the COP attenuation rate in a plurality of continuous detection periods is larger than a first grading threshold value and smaller than or equal to a second grading threshold value, controlling the air conditioner to enter the primary frost suppression mode; When the COP attenuation rate in a plurality of continuous detection periods is larger than the second classification threshold value and is smaller than or equal to a third classification threshold value, controlling the air conditioner to enter the second-stage frost suppression mode; Controlling the air conditioner to enter the reversing defrosting mode when the COP attenuation rate in a plurality of continuous detection periods is greater than the third grading threshold and/or the outdoor coil temperature is less than the difference value between the outdoor environment temperature and the frosting temperature threshold; wherein the first classification threshold is less than the second classification threshold, which is less than the third classification threshold.
5. The method of claim 4, wherein the controlling the air conditioner to enter the primary frost suppression mode specifically comprises: acquiring the current expansion valve opening of the air conditioner; According to the current expansion valve opening, the COP attenuation rate and the first grading threshold, calculating to obtain a first target expansion valve opening, and further adjusting the current expansion valve opening to be increased to the first target expansion valve opening; and calculating to obtain a target fan rotating speed according to the indoor fan rotating speed, the COP attenuation rate and the first grading threshold value, and further adjusting the indoor fan rotating speed to be reduced to the target fan rotating speed.
6. The method of claim 4, wherein the controlling the air conditioner to enter the secondary frost suppression mode specifically comprises: acquiring the initial press operating frequency and the current expansion valve opening of the air conditioner; According to the initial press operating frequency, the COP attenuation rate and the second classification threshold, calculating to obtain a target operating frequency, and further adjusting the initial press operating frequency to be reduced to the target operating frequency; and calculating to obtain a second target expansion valve opening according to the current expansion valve opening, the COP attenuation rate and the second classification threshold, and further adjusting the current expansion valve opening to be increased to the second target expansion valve opening.
7. The method according to claim 4, wherein the controlling the air conditioner to enter the reverse defrosting mode specifically comprises: Adjusting the press operating frequency of the air conditioner to be reduced to a first operating frequency; the four-way valve is controlled to change direction, and then the indoor fan and the outdoor fan are closed; Controlling the press operating frequency of the air conditioner to operate at a second operating frequency; if the temperature of the outdoor coil at the current moment is greater than a steady-state temperature threshold value, maintaining a first duration, and controlling the operation frequency of the press of the air conditioner to operate at the first operation frequency; if the temperature of the outdoor coil at the current moment is greater than the sum of the outdoor environment temperature and the defrosting temperature threshold, maintaining the second duration, and controlling the four-way valve to perform reversing; wherein the first operating frequency is less than the second operating frequency.
8. A control system, comprising: At least one processor; at least one memory for storing at least one program; the at least one program, when executed by the at least one processor, causes the at least one processor to implement the method of any one of claims 1 to 7.
9. An air conditioner comprising the control system of claim 8.
10. A computer readable storage medium, in which a processor executable program is stored, characterized in that the processor executable program when executed by a processor implements the method according to any of claims 1 to 7.

Description

Defrosting control method and system based on COP attenuation rate, air conditioner and medium Technical Field The application relates to the technical field of air conditioners, in particular to a defrosting control method and system based on a COP attenuation rate, an air conditioner and a medium. Background During heating operation in winter, the surface of the heat exchanger of the air conditioner outdoor unit may be frosted due to a low-temperature and high-humidity environment. The frost layer can seriously obstruct heat exchange, resulting in reduced heating capacity of the system, increased energy consumption, and even damage to the compressor. The traditional defrosting control methods such as a timing defrosting method, a temperature-time combined control method, a pressure difference or air flow detection method and the like are used for judging that the frosting indexes (such as time and temperature) do not directly reflect the deterioration degree of the system performance, so that the defrosting time is inaccurate, hysteresis exists, the comfort of a user is influenced, and the energy waste is caused. Disclosure of Invention The embodiment of the application mainly aims to provide a defrosting control method, a defrosting control system, an air conditioner and a medium based on a COP attenuation rate, which can quantify the performance loss degree of a system in real time and accurately determine defrosting time. In order to achieve the above object, an aspect of the embodiments of the present application provides a defrosting control method based on COP attenuation rate, including the following steps: collecting the rotating speed of an indoor fan, the temperature of an indoor coil pipe and the consumption power; Calculating to obtain a COP average value and a COP maximum value according to the rotating speed of the indoor fan, the temperature of the indoor coil pipe and the consumed power; According to the COP average value and the COP maximum value, calculating to obtain a COP attenuation rate; And controlling the air conditioner to enter a primary frost suppression mode, a secondary frost suppression mode or a reversing defrosting mode according to the COP attenuation rate. In some embodiments, the calculating, according to the indoor fan rotation speed, the indoor coil temperature and the consumed power, obtains a COP average value and a COP maximum value specifically includes: Constructing a rotating speed-air volume linear model, and inputting the rotating speed of the indoor fan into the rotating speed-air volume linear model to obtain an air volume value; calculating to obtain a virtual capacity value according to the air quantity value and the indoor coil temperature; Calculating COP values in each detection period according to the virtual capacity value and the consumed power; Calculating the average value of the COP value in the detection period to obtain the average value of the COP value; and obtaining the maximum COP value from the starting operation of the air conditioner to the COP attenuation period according to the COP value. In some embodiments, the calculating the COP attenuation rate according to the COP average value and the COP maximum value specifically includes: Performing a difference operation on the COP average value and the COP maximum value, and further performing a division operation on the difference obtained by the difference operation and the COP maximum value to obtain the COP attenuation rate; the calculation formula of the COP attenuation rate is as follows: ; Wherein, the For the COP decay rate in question,As a result of the COP mean value,Is the COP maximum. In some embodiments, the controlling the air conditioner to enter a primary frost suppression mode, a secondary frost suppression mode or a reversing frost suppression mode according to the COP attenuation rate specifically includes: Collecting the temperature of an outdoor coil pipe and the temperature of an outdoor environment; When the COP attenuation rate in a plurality of continuous detection periods is larger than a first grading threshold value and smaller than or equal to a second grading threshold value, controlling the air conditioner to enter the primary frost suppression mode; When the COP attenuation rate in a plurality of continuous detection periods is larger than the second classification threshold value and is smaller than or equal to a third classification threshold value, controlling the air conditioner to enter the second-stage frost suppression mode; Controlling the air conditioner to enter the reversing defrosting mode when the COP attenuation rate in a plurality of continuous detection periods is greater than the third grading threshold and/or the outdoor coil temperature is less than the difference value between the outdoor environment temperature and the frosting temperature threshold; wherein the first classification threshold is less than the second classification threshol