CN110410939B - Control method and system for defrosting of air conditioner external unit and air conditioner - Google Patents
Control method and system for defrosting of air conditioner external unit and air conditioner Download PDFInfo
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- CN110410939B CN110410939B CN201910737432.3A CN201910737432A CN110410939B CN 110410939 B CN110410939 B CN 110410939B CN 201910737432 A CN201910737432 A CN 201910737432A CN 110410939 B CN110410939 B CN 110410939B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/10—Weather information or forecasts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
A control method and a system for defrosting of an air conditioner external unit and an air conditioner are provided, wherein the control method comprises the following steps: acquiring real-time weather conditions, humidity, external environment temperature and external coil temperature in a heating mode; judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil; and judging whether the defrosting exit condition is met or not after entering defrosting, and exiting defrosting control in time. The optimal control of defrosting is realized by increasing judgment factors related to weather conditions and humidity, and the air conditioner still has good heating effect under the condition of high air humidity.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control system for defrosting of an air conditioner external unit and an air conditioner.
Background
When the air conditioner is in heating operation in winter, the outdoor heat exchanger absorbs heat from outdoor air, the ambient temperature of the outdoor heat exchanger is low, and water vapor in the air is condensed into frost to be attached to the surface of the outdoor heat exchanger. If the frost is not timely dissolved, the attached frost can affect the heat exchange capability of the outdoor heat exchanger, so that the heating capability of the air conditioner is reduced, and the comfort of people is affected.
The existing air conditioner outdoor unit mainly detects the outdoor environment temperature and the outer disc temperature through a temperature sensor, judges whether the external environment temperature is lower than a certain specific threshold value, and controls to enter a defrosting mode.
Disclosure of Invention
The invention at least solves the problems that: in the case of a high air humidity, such as in rainy or foggy days, the condition of frost formation on the condenser during heating operation is more serious, and good defrosting and heating effects cannot be achieved only by determining and controlling the external environment temperature.
In order to solve the above problems, the present invention provides a control method and system for defrosting an external unit of an air conditioner, and an air conditioner.
According to an aspect of the present invention, there is provided a method for controlling defrosting of an outdoor unit of an air conditioner, including: acquiring real-time weather conditions, humidity, external environment temperature and external coil temperature in a heating mode; judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil; and judging whether the defrosting exit condition is met or not after entering defrosting, and exiting defrosting control in time.
Whether defrosting is started or not is judged according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil, factors related to the weather condition and the humidity are added into the defrosting condition, and the corresponding defrosting judgment condition (low limit defrosting condition) is adopted under the conditions of rainy days and high humidity, so that defrosting can be started in time, and the problem that defrosting is not timely caused by serious frosting on a condenser in heating operation due to high humidity is solved; under the condition of relatively low humidity, because the corresponding condition of frosting is not very serious, a more severe defrosting judgment condition (a high-limit defrosting condition) is adopted to perform defrosting at a proper (necessary) opportunity, defrosting conditions at different degrees are pre-judged according to different weather conditions and humidity, then defrosting is judged to enter and exit according to threshold conditions under different requirements based on the external environment temperature and the temperature of an external coil, the optimal control on defrosting is realized by increasing judgment factors related to the weather conditions and the humidity, and a good heating effect is still realized under the condition of relatively high air humidity.
Further, the method for judging whether to defrost according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil pipe comprises the following steps:
judging whether the current weather condition and humidity meet the conditions that rain exists and the humidity is larger than a first threshold value;
if the current weather condition meets the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a low-limit defrosting condition is met to determine whether to enter defrosting, wherein the low-limit defrosting condition is one of the following two conditions, and defrosting is entered when any one condition is met: the condition one is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a third threshold value continuously for a third time; the condition II is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a fourth threshold value for a continuous fourth time;
if the current weather condition does not meet the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a high-limit defrosting condition is met or not to determine whether defrosting is to be started or not, wherein the high-limit defrosting condition is one of the following two conditions, and defrosting is started when any one condition is met: the condition III is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a fifth threshold value continuously for a fifth time; the condition four is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a sixth threshold value for a sixth time;
wherein the fourth threshold is less than the third threshold and less than 0, and the fourth time is greater than the third time; the sixth threshold value is less than the fifth threshold value and less than 0, and the fifth time is more than the sixth time; the fifth threshold is less than the third threshold, and the fifth time is greater than the third time; the sixth threshold is less than the fourth threshold, and the sixth time is greater than the fourth time.
In this embodiment, it is determined whether the current weather condition and humidity satisfy the condition that rain exists and the humidity is greater than a first threshold (for example, 80%), and further enter the low-limit defrosting condition or the high-limit defrosting condition to determine whether to enter defrosting, and when rain exists and the humidity is greater than 80%, the low-limit defrosting condition is correspondingly required to enter defrosting in time, and when rain does not satisfy the condition that the humidity is greater than 80%, the corresponding air humidity is relatively low, and at this time, because the frosting is not very serious, the more severe high-limit defrosting condition is adopted to enter defrosting again at a proper (necessary) time, and the high-limit defrosting condition and the low-limit defrosting condition are determined by using the external environment temperature and the external coil temperature, and the difference is that the setting of the threshold is different, the high-limit defrosting condition has a lower threshold temperature compared with the lower-limit defrosting condition, and the defrosting can be started only when the temperature of the external coil is lower than the threshold temperature in a longer time period, so that the defrosting can be started in time under the condition of high humidity, and the defrosting can be started at necessary time under the condition of relatively low humidity, and a good heating effect is realized.
Further, the defrosting exit condition is one of the following conditions, and defrosting exits when any one of the conditions is satisfied: after the first set time duration, the temperature of the outer coil is greater than the set temperature; or the continuous defrosting time is longer than a second set time, wherein the set temperature is longer than zero, and the first set time is shorter than the second set time.
In the embodiment, the first set time period is, for example, 2 to 4min, the set temperature is, for example, 4 ℃ to 6 ℃, and the second set time period is, for example, 8 to 10 min.
Further, the conditions for entering defrosting are different, and the corresponding defrosting exit conditions are different, and when the condition one is met, entering defrosting, the corresponding defrosting exit conditions are as follows: after the seventh time, the temperature of the external coil is higher than the seventh temperature, or the continuous defrosting time is longer than the eighth time; when the second condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the ninth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eighth time; when the third condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the tenth time, the temperature of the external coil is greater than the seventh temperature, or the continuous defrosting time is greater than the eleventh time; when the condition four is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the twelfth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eleventh time; wherein the seventh temperature is less than the ninth temperature, the seventh time is greater than the ninth time, the tenth time is greater than the twelfth time, and the eighth time is greater than the eleventh time.
Through the defrosting exit condition that corresponds different under the different entering defrosting condition, based on current weather condition and humidity and the timely degree that corresponds the defrosting, the exit defrosting condition sets up according to following principle: the low-limit defrosting condition corresponds to a severer defrosting exit condition (for example, the eighth time is 10min), so that timely and sufficient defrosting can be realized under the condition of high humidity correspondingly in each defrosting control period; for the high-limit defrosting condition, a looser defrosting exit condition (for example, 8min corresponding to the eleventh time) is corresponded, so that in each defrosting control period, if the humidity is relatively small and the frosting is not too serious, the resource occupation time is prevented from being too long, and the necessary defrosting can be realized.
Further, the first threshold is 75% to 85%.
Further, the eighth time is 9-10min, for example, 10min, and the eleventh time is: 7-8min, for example 8 min.
According to another aspect of the present invention, there is provided a control system for defrosting an outdoor unit of an air conditioner, including: the weather obtaining module is used for obtaining real-time weather conditions; the temperature detection module is used for acquiring real-time external environment temperature and external coil temperature; the humidity detection module is used for acquiring real-time humidity; the judging module is used for judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil pipe and judging whether a defrosting exit condition is met or not after defrosting is started; and the defrosting control module is used for entering defrosting control or exiting defrosting control according to the judgment result of the judgment module.
According to still another aspect of the present invention, there is provided a control system for defrosting an outdoor unit of an air conditioner, for use in any one of the control methods mentioned in the present invention.
According to a further aspect of the present invention, there is provided an air conditioner including any one of the control systems mentioned in the present invention.
Further, a temperature and humidity sensor is arranged on the back of an outer unit condenser of the air conditioner and used for simultaneously acquiring real-time external environment temperature and humidity; an outer coil temperature sensor is arranged at the bottom of the outer machine condenser and used for acquiring the temperature of the outer coil; and the GPRS module of the air conditioner is used for acquiring real-time weather conditions.
The control system and the air conditioner are beneficial to adopting corresponding defrosting judgment conditions (low limit defrosting conditions) under the conditions of rainy days and high humidity by adding factors related to weather conditions and humidity into the defrosting conditions so as to be beneficial to entering defrosting in time and avoid the problem that the defrosting is not in time due to serious frosting on a condenser in heating operation caused by high humidity; under the condition of relatively low humidity, a more severe defrosting judgment condition (a high-limit defrosting condition) is adopted to perform defrosting at a proper (necessary) opportunity, defrosting conditions of different degrees are pre-judged corresponding to different weather conditions and humidity, then defrosting is judged to enter and exit according to threshold conditions under different requirements based on the external environment temperature and the external coil temperature, optimal control on defrosting is realized by increasing judgment factors related to the weather conditions and humidity, and a good heating effect is still achieved under the condition of high air humidity.
Drawings
Fig. 1 is a flowchart illustrating a method for controlling defrosting of an external unit of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a detailed embodiment of steps corresponding to the flowchart shown in FIG. 1;
fig. 3 is a block diagram illustrating a system for controlling defrosting of an external unit of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
3-a control system;
31-a weather acquisition module; 32-a temperature detection module;
33-a humidity detection module; 34-a judgment module;
35-defrosting control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
First embodiment
In a first exemplary embodiment of the present invention, a method for controlling defrosting of an outdoor unit of an air conditioner is provided.
Fig. 1 is a flowchart illustrating a method for controlling defrosting of an external unit of an air conditioner according to an embodiment of the present invention; fig. 2 is a detailed embodiment of each step corresponding to the flowchart shown in fig. 1.
Referring to fig. 1 and 2, a method for controlling defrosting of an external unit of an air conditioner according to the present invention includes:
step S11: acquiring real-time weather conditions, humidity, external environment temperature and external coil temperature in a heating mode;
in the embodiment, a temperature and humidity sensor is arranged on the back of an outdoor unit condenser of the air conditioner and used for simultaneously acquiring real-time external environment temperature and humidity; an outer coil temperature sensor is arranged at the bottom of the outer machine condenser and used for acquiring the temperature of the outer coil; and the GPRS module of the air conditioner is used as a weather acquisition module and is used for acquiring real-time weather conditions.
In other embodiments, the modules or devices may also be other devices that can implement the above functions, and multiple modules or devices may be integrated into one module to implement multiple functions, or multiple sub-modules may implement one function together.
Step S12: judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil;
further, the method for judging whether to defrost according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil pipe comprises the following steps:
judging whether the current weather condition and humidity meet the conditions that rain exists and the humidity is larger than a first threshold value;
if the current weather condition meets the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a low-limit defrosting condition is met to determine whether to enter defrosting, wherein the low-limit defrosting condition is one of the following two conditions, and defrosting is entered when any one condition is met: the condition one is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a third threshold value continuously for a third time; the condition II is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a fourth threshold value for a continuous fourth time;
if the current weather condition does not meet the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a high-limit defrosting condition is met or not to determine whether defrosting is to be started or not, wherein the high-limit defrosting condition is one of the following two conditions, and defrosting is started when any one condition is met: the condition III is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a fifth threshold value continuously for a fifth time; the condition four is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a sixth threshold value for a sixth time;
wherein the fourth threshold is less than the third threshold and less than 0, and the fourth time is greater than the third time; the sixth threshold value is less than the fifth threshold value and less than 0, and the fifth time is more than the sixth time; the fifth threshold is less than the third threshold, and the fifth time is greater than the third time; the sixth threshold is less than the fourth threshold, and the sixth time is greater than the fourth time.
Specifically, in an embodiment, referring to fig. 2, the first threshold is 75% to 85%, for example, 80%, the second threshold is 0 ℃, the third time is 35min, the third threshold is-10 ℃, the fourth time is 45min, and the fourth threshold is-15 ℃, if the current weather is rainy and the air humidity is greater than 80% in the heating mode, it is determined whether a low-limit defrosting condition is satisfied, where the low-limit defrosting condition is: judging the external environment temperature Tao and the external coil temperature Tdp, and defrosting if the external environment temperature Tao is less than or equal to 0 ℃ and the external coil temperature Tdp is less than-10 ℃ for 35min continuously; and if the external environment temperature Tao is more than 0 ℃ and the temperature Tdp of the external coil pipe is less than-15 ℃ for 45min continuously, defrosting is carried out. In this example, the corresponding fifth time is 70min, the fifth threshold is-15 ℃, the sixth time is 60min, and the sixth threshold is-20 ℃, if in the heating mode, the current weather and humidity do not satisfy the rainy day and the air humidity is greater than 80%, it is determined whether a high-limit defrosting condition is satisfied, where the high-limit defrosting condition is: if the external environment temperature Tao is less than or equal to 0 ℃ and the temperature Tdp of the external coil pipe is less than-15 ℃ for 70min continuously, defrosting is carried out; and if the external environment temperature Tao is more than 0 ℃ and the temperature Tdp of the external coil pipe is less than-20 ℃ for continuous 60min, defrosting is carried out.
In this embodiment, it is determined whether the current weather condition and humidity satisfy the condition that rain exists and the humidity is greater than a first threshold (for example, 80%), and further enter the low-limit defrosting condition or the high-limit defrosting condition to determine whether to enter defrosting, and when rain exists and the humidity is greater than 80%, the low-limit defrosting condition is correspondingly required to enter defrosting in time, and when rain does not satisfy the condition that the humidity is greater than 80%, the corresponding air humidity is relatively low, and at this time, because the frosting is not very serious, the more severe high-limit defrosting condition is adopted to enter defrosting again at a proper (necessary) time, and the high-limit defrosting condition and the low-limit defrosting condition are determined by using the external environment temperature and the external coil temperature, and the difference is that the setting of the threshold is different, the high-limit defrosting condition has a lower threshold temperature compared with the lower-limit defrosting condition, and the defrosting can be started only when the temperature of the external coil is lower than the threshold temperature in a longer time period, so that the defrosting can be started in time under the condition of high humidity, and the defrosting can be started at necessary time under the condition of relatively low humidity, and a good heating effect is realized.
Step S13: judging whether a defrosting exit condition is met or not after entering defrosting, and exiting defrosting control in time;
further, the defrosting exit condition is one of the following conditions, and defrosting exits when any one of the conditions is satisfied: after the first set time duration, the temperature of the outer coil is greater than the set temperature; or the continuous defrosting time is longer than a second set time, wherein the set temperature is longer than zero, and the first set time is shorter than the second set time.
In the embodiment, the first set time period is, for example, 2 to 4min, the set temperature is, for example, 4 ℃ to 6 ℃, and the second set time period is, for example, 8 to 10 min.
Further, the conditions for entering defrosting are different, and the corresponding defrosting exit conditions are different, and when the condition one is met, entering defrosting, the corresponding defrosting exit conditions are as follows: after the seventh time, the temperature of the external coil is higher than the seventh temperature, or the continuous defrosting time is longer than the eighth time; when the second condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the ninth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eighth time; when the third condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the tenth time, the temperature of the external coil is greater than the seventh temperature, or the continuous defrosting time is greater than the eleventh time; when the condition four is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the twelfth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eleventh time; wherein the seventh temperature is less than the ninth temperature, the seventh time is greater than the ninth time, the tenth time is greater than the twelfth time, and the eighth time is greater than the eleventh time.
Optionally, the eighth time is 9 to 10min, for example, 10min, and the eleventh time is: 7-8min, for example 8 min.
Specifically, in this embodiment, referring to fig. 2, the seventh time is 4min, the seventh temperature is 4 ℃, the eighth time is 10min, and the defrosting exit condition corresponding to the condition one that defrosting enters is: the defrosting is quitted when the temperature Tdp of the external coil pipe lasts for 4min and is more than 4 ℃, or the defrosting is quitted when the continuous defrosting time is 10min at most and is more than 10 min; the ninth time is 3min, the ninth temperature is 6 ℃, and the defrosting exit condition corresponding to the condition two entering defrosting is as follows: the defrosting is quitted when the temperature Tdp of the external coil pipe lasts for 3min and is more than 6 ℃, or the defrosting is quitted when the continuous defrosting time is 10min at most and is more than 10 min; the tenth time is 3min, the eleventh time is 8min, and the defrosting exit condition corresponding to the third entering defrosting condition is as follows: the defrosting is quitted when the temperature Tdp of the external coil pipe lasts for 3min and is more than 4 ℃, or the defrosting is quitted when the continuous defrosting time is 8min at the longest and is more than 8 min; the twelfth time is 2min, and the defrosting exit condition corresponding to the condition four entering defrosting is as follows: and (3) if the temperature Tdp of the outer coil pipe lasts for 2min and is more than 6 ℃, the defrosting is quitted, or the maximum continuous defrosting time is 8min, and the defrosting is quitted when the continuous defrosting time is more than 8 min.
Through the defrosting exit condition that corresponds different under the different entering defrosting condition, based on current weather condition and humidity and the timely degree that corresponds the defrosting, the exit defrosting condition sets up according to following principle: the low-limit defrosting condition corresponds to a severer defrosting exit condition (for example, the eighth time is 10min), so that timely and sufficient defrosting can be realized under the condition of high humidity correspondingly in each defrosting control period; for the high-limit defrosting condition, a looser defrosting exit condition (for example, 8min corresponding to the eleventh time) is corresponded, so that in each defrosting control period, if the humidity is relatively small and the frosting is not too serious, the resource occupation time is prevented from being too long, and the necessary defrosting can be realized.
In summary, in the embodiment, the control method determines whether to perform defrosting according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil, and the factors related to the weather condition and the humidity are added to the defrosting condition, so that the corresponding defrosting determination condition (low limit defrosting condition) is adopted under the rainy day and the high humidity condition, so as to facilitate to perform defrosting in time, and avoid the problem that the defrosting is not performed in time due to severe frosting on the condenser during heating operation caused by high humidity; under the condition of relatively low humidity, because the corresponding condition of frosting is not very serious, a more severe defrosting judgment condition (a high-limit defrosting condition) is adopted to perform defrosting at a proper (necessary) opportunity, defrosting conditions at different degrees are pre-judged according to different weather conditions and humidity, then defrosting is judged to enter and exit according to threshold conditions under different requirements based on the external environment temperature and the temperature of an external coil, the optimal control on defrosting is realized by increasing judgment factors related to the weather conditions and the humidity, and a good heating effect is still realized under the condition of relatively high air humidity.
Second embodiment
In a second exemplary embodiment of the present invention, a control system for defrosting an outdoor unit of an air conditioner is provided.
Fig. 3 is a block diagram illustrating a system for controlling defrosting of an external unit of an air conditioner according to an embodiment of the present invention.
Referring to fig. 3, a control system 3 for defrosting an external unit of an air conditioner according to the present invention includes: a weather obtaining module 31, configured to obtain a real-time weather condition; the temperature detection module 32 is used for acquiring real-time external environment temperature and external coil temperature; the humidity detection module 33 is used for acquiring real-time humidity; the judging module 34 is configured to judge whether to enter defrosting according to the real-time weather condition, humidity, external environment temperature, and external coil temperature, and determine whether to meet a defrosting exit condition after entering defrosting; and a defrosting control module 35, configured to enter defrosting control or exit defrosting control according to the determination result of the determination module.
In this embodiment, the control system 3 is configured to execute the control method shown in the first embodiment.
The control system is beneficial to adopting corresponding defrosting judgment conditions (low limit defrosting conditions) under the condition of rainy days and high humidity by adding factors related to weather conditions and humidity into the defrosting conditions so as to be beneficial to entering defrosting in time and avoid the problem that the defrosting is not in time due to serious frosting on a condenser in heating operation caused by high humidity; under the condition of relatively low humidity, a more severe defrosting judgment condition (a high-limit defrosting condition) is adopted to perform defrosting at a proper (necessary) opportunity, defrosting conditions of different degrees are pre-judged corresponding to different weather conditions and humidity, then defrosting is judged to enter and exit according to threshold conditions under different requirements based on the external environment temperature and the external coil temperature, optimal control on defrosting is realized by increasing judgment factors related to the weather conditions and humidity, and a good heating effect is still achieved under the condition of high air humidity.
Third embodiment
In a third exemplary embodiment of the present invention, there is provided an air conditioner including the control system of the present invention or for performing the control method of the present invention.
In this embodiment, a temperature and humidity sensor is arranged on the back of an outdoor unit condenser of the air conditioner and used for simultaneously acquiring real-time external environment temperature and humidity; an outer coil temperature sensor is arranged at the bottom of the outer machine condenser and used for acquiring the temperature of the outer coil; the GPRS module of the air conditioner serves as a weather acquisition module 31 for acquiring real-time weather conditions.
The air conditioner realizes the optimized control of defrosting by increasing judgment factors related to weather conditions and humidity, and still has good heating effect under the condition of high air humidity.
In summary, the invention provides a control method and a system for defrosting an air conditioner outdoor unit and an air conditioner, wherein whether defrosting is started or not is judged according to real-time weather conditions, humidity, external environment temperature and external coil pipe temperature, factors related to the weather conditions and the humidity are added into the defrosting conditions, so that corresponding defrosting judgment conditions (low limit defrosting conditions) are adopted under the conditions of rainy days and high humidity, and timely defrosting is facilitated, so that the problem that defrosting is not timely due to serious frosting on a condenser in heating operation caused by high humidity is avoided; under the condition of relatively low humidity, because the corresponding condition of frosting is not very serious, a more severe defrosting judgment condition (a high-limit defrosting condition) is adopted to perform defrosting at a proper (necessary) opportunity, defrosting conditions at different degrees are pre-judged according to different weather conditions and humidity, then defrosting is judged to enter and exit according to threshold conditions under different requirements based on the external environment temperature and the temperature of an external coil, the optimal control on defrosting is realized by increasing judgment factors related to the weather conditions and the humidity, and a good heating effect is still realized under the condition of relatively high air humidity.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A control method for defrosting of an air conditioner outdoor unit is characterized by comprising the following steps:
acquiring real-time weather conditions, humidity, external environment temperature and external coil temperature in a heating mode;
judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil; and
judging whether a defrosting exit condition is met or not after entering defrosting, and exiting defrosting control in time;
the method for judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil pipe comprises the following steps:
judging whether the current weather condition and humidity meet the conditions that rain exists and the humidity is larger than a first threshold value;
if the current weather condition meets the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a low-limit defrosting condition is met to determine whether to enter defrosting, wherein the low-limit defrosting condition is one of the following two conditions, and defrosting is entered when any one condition is met: the condition one is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a third threshold value continuously for a third time; the condition II is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a fourth threshold value for a continuous fourth time;
if the current weather condition does not meet the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a high-limit defrosting condition is met or not to determine whether defrosting is to be started or not, wherein the high-limit defrosting condition is one of the following two conditions, and defrosting is started when any one condition is met: the condition III is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a fifth threshold value continuously for a fifth time; the condition four is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a sixth threshold value for a sixth time;
wherein the fourth threshold < third threshold <0, the fourth time > a third time; the sixth threshold < fifth threshold <0, the fifth time > sixth time; the fifth threshold < third threshold, the fifth time > third time; the sixth threshold < fourth threshold, the sixth time > fourth time.
2. The control method according to claim 1, wherein the defrost exit condition is one of the following conditions, either of which is satisfied to exit defrost: after the first set time duration, the temperature of the outer coil is greater than the set temperature; or the continuous defrosting time is longer than a second set time, wherein the set temperature is longer than zero, and the first set time is shorter than the second set time.
3. The control method according to claim 2, wherein conditions for entering defrosting are different, and corresponding defrosting exit conditions are different, and when the condition is satisfied, when entering defrosting, the corresponding defrosting exit conditions are: after the seventh time, the temperature of the external coil is higher than the seventh temperature, or the continuous defrosting time is longer than the eighth time; when the second condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the ninth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eighth time; when the third condition is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the tenth time, the temperature of the external coil is greater than the seventh temperature, or the continuous defrosting time is greater than the eleventh time; when the condition four is met, entering defrosting, wherein the corresponding defrosting exit condition is as follows: after the twelfth time, the temperature of the outer coil is greater than the ninth temperature, or the continuous defrosting time is greater than the eleventh time; wherein the seventh temperature < ninth temperature, the seventh time > ninth time, the tenth time > twelfth time, the eighth time > eleventh time.
4. The control method of claim 1, wherein the first threshold is 75% -85%.
5. The control method according to claim 3, wherein the eighth time is 9-10min, and the eleventh time is: 7-8 min.
6. A control system for defrosting an outer unit of an air conditioner is characterized by comprising:
the weather obtaining module is used for obtaining real-time weather conditions; the temperature detection module is used for acquiring real-time external environment temperature and external coil temperature; the humidity detection module is used for acquiring real-time humidity; the judging module is used for judging whether defrosting is started or not according to the real-time weather condition, the humidity, the external environment temperature and the temperature of the external coil pipe and judging whether a defrosting exit condition is met or not after defrosting is started; the defrosting control module is used for entering defrosting control or exiting defrosting control according to the judgment result of the judgment module;
wherein, whether the judgement according to real-time weather condition, humidity, external environment temperature and outer coil pipe temperature gets into the defrosting includes:
judging whether the current weather condition and humidity meet the conditions that rain exists and the humidity is larger than a first threshold value;
if the current weather condition meets the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a low-limit defrosting condition is met to determine whether to enter defrosting, wherein the low-limit defrosting condition is one of the following two conditions, and defrosting is entered when any one condition is met: the condition one is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a third threshold value continuously for a third time; the condition II is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a fourth threshold value for a continuous fourth time;
if the current weather condition does not meet the conditions that rain exists and the humidity is larger than a first threshold value, judging whether a high-limit defrosting condition is met or not to determine whether defrosting is to be started or not, wherein the high-limit defrosting condition is one of the following two conditions, and defrosting is started when any one condition is met: the condition III is that the external environment temperature is less than or equal to a second threshold value and the temperature of the external coil pipe is less than a fifth threshold value continuously for a fifth time; the condition four is that the external environment temperature is greater than a second threshold value and the temperature of the external coil pipe is less than a sixth threshold value for a sixth time;
wherein the fourth threshold < third threshold <0, the fourth time > a third time; the sixth threshold < fifth threshold <0, the fifth time > sixth time; the fifth threshold < third threshold, the fifth time > third time; the sixth threshold < fourth threshold, the sixth time > fourth time.
7. A control system for defrosting an outdoor unit of an air conditioner, characterized by performing the control method of any one of claims 1 to 5.
8. An air conditioner characterized by comprising the control system of claim 6 or 7.
9. An air conditioner, characterized in that, the control system of claim 6 is included, wherein a temperature and humidity sensor is arranged on the back of an outdoor unit condenser of the air conditioner, and is used for simultaneously acquiring real-time external environment temperature and humidity; an outer coil temperature sensor is arranged at the bottom of the outer machine condenser and used for acquiring the temperature of the outer coil; and the GPRS module of the air conditioner is used as a weather acquisition module and is used for acquiring real-time weather conditions.
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| CN113124544B (en) * | 2021-04-20 | 2023-04-25 | 青岛海尔空调电子有限公司 | Air conditioning unit and defrosting control method thereof |
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| CN102829527B (en) * | 2012-03-20 | 2013-12-04 | 广东志高空调有限公司 | Cloud air conditioning self-adaptive defrosting system |
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