CN110836460A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN110836460A CN110836460A CN201810940096.8A CN201810940096A CN110836460A CN 110836460 A CN110836460 A CN 110836460A CN 201810940096 A CN201810940096 A CN 201810940096A CN 110836460 A CN110836460 A CN 110836460A
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- time
- temperature
- air conditioner
- control method
- defrosting
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner. In order to improve the defrosting efficiency of the air conditioner, the method provided by the invention comprises the following steps: after the air conditioner enters a defrosting mode, controlling the reverse rotation time T of the outdoor fan at set time intervals; wherein the time T is determined as follows: detecting the temperature of the outer coil; comparing the outer coil temperature to a dew point temperature; and determining the time T according to the comparison result. According to the invention, after the frost is melted partially each time, the frost layer is blown off rapidly by utilizing the back blowing action of the outdoor fan, so that the defrosting efficiency is improved. And the time T is determined according to the comparison result of the temperature of the external coil and the dew point temperature, namely the time for reversing the outdoor fan is controlled by using the difference value between the temperature of the external coil and the dew point temperature, so that the time for reversing the fan every time is controlled more accurately, a melted frost layer is blown off more accurately and efficiently, and the defrosting efficiency of the air conditioner is greatly improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner.
Background
The air conditioner as a device capable of adjusting the indoor environment temperature has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. When the air conditioner heats the operation, if outdoor coil pipe temperature under certain humidity condition crosses lowly can lead to the condition of frosting, and outdoor coil pipe frosting can lead to outdoor heat exchanger's heat exchange efficiency to reduce, influences the heating effect of air conditioner, reduces indoor environment's travelling comfort, influences user experience. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor coil of the air conditioner needs to be defrosted timely and effectively.
In the prior art, an air conditioner basically adopts reverse cycle defrosting (i.e., the outdoor unit is defrosted by switching the direction of a four-way valve) or bypass defrosting (the outdoor unit is defrosted by opening a bypass branch), and whether to quit defrosting is judged by monitoring defrosting time or certain parameters such as the temperature of an external coil pipe. And lack the auxiliary means in the defrosting process and accelerate defrosting efficiency, lead to current defrosting process singleness, efficiency is lower.
Therefore, there is a need in the art for a new defrost control method to improve the defrost efficiency of an air conditioner.
Disclosure of Invention
Based on the above problems in the background art, in order to improve the defrosting efficiency of the air conditioner, the invention provides a defrosting control method of the air conditioner, which comprises the following steps: after the air conditioner enters a defrosting mode, controlling the reverse rotation time T of the outdoor fan at set time intervals; wherein the time T is determined as follows: detecting the temperature of the outer coil; comparing the outer coil temperature to a dew point temperature; and determining the time T according to the comparison result.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the set time is any time between 1 and 4 minutes.
In a preferred embodiment of the above-described defrosting control method of an air conditioner, the set time is 2 minutes, or the set time is 3 minutes.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the step of "determining the time T according to the comparison result" specifically includes: when the temperature of the outer coil minus the dew point temperature is less than or equal to a first preset temperature, the time T is 10 seconds; when the temperature of the outer coil minus the dew point temperature is greater than a first preset temperature and less than a second preset temperature, the time T is 15 seconds; and when the temperature of the outer coil minus the dew point temperature is greater than or equal to a second preset temperature, the time T is 25 seconds.
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset temperature is any temperature within a range of [ -9 ℃, -7 ℃ ] and the second preset temperature is any temperature within a range of [ -1 ℃, 1 ℃ ].
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset temperature is-8 ℃, and the second preset temperature is 0 ℃.
In a preferred embodiment of the above defrosting control method for an air conditioner, before the step of controlling the reverse rotation time T of the outdoor fan every set time after the air conditioner enters the defrosting mode, the method further includes: detecting the temperature of an external coil of the air conditioner; when the temperature of the external coil is lower than the dew point temperature, detecting the continuous operation time of the air conditioner in the state; and if the continuous operation time is more than a first preset time, enabling the air conditioner to enter a defrosting mode.
In a preferred embodiment of the above defrosting control method of an air conditioner, the first preset time is any time between 35 and 45 minutes; or the first preset time is 40 minutes.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, after the step of controlling the outdoor fan reverse rotation time T every set time after the air conditioner enters the defrosting mode, the method further comprises: when the temperature of the external coil is higher than the set temperature, detecting the continuous operation time of the air conditioner in the state; and if the continuous operation time is more than a second preset time, enabling the air conditioner to exit the defrosting mode.
In a preferred embodiment of the above defrosting control method of an air conditioner, the second preset time is any time between 15 and 25 seconds; or the second preset time is 20 seconds.
In the scheme of the invention, after the air conditioner enters the defrosting mode, the reversing time T of the outdoor fan is controlled at set time intervals, namely the reversing time T of the fan is controlled at a certain time interval after defrosting, in other words, after frost is melted partially, the frost layer is blown off quickly by utilizing the back blowing action of the outdoor fan, so that the defrosting efficiency is improved. And the time T is determined according to the comparison result of the temperature of the external coil and the dew point temperature, namely the time for reversing the outdoor fan is controlled by using the difference value between the temperature of the external coil and the dew point temperature, so that the time for reversing the fan every time is controlled more accurately, a melted frost layer is blown off more accurately and efficiently, and the defrosting efficiency of the air conditioner is greatly improved.
Drawings
Fig. 1 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The defrosting control method of the air conditioner comprises the following steps: and after the air conditioner enters a defrosting mode, controlling the reverse rotation time T of the outdoor fan at set time intervals. Wherein, the time T is determined according to the following mode: detecting the temperature of the outer coil; comparing the temperature of the outer coil with the dew point temperature; and determining the time T according to the comparison result. For example, when the temperature of the external coil minus the dew point temperature is less than or equal to a first preset temperature, the time T is 10 seconds; when the temperature of the outer coil minus the dew point temperature is greater than a first preset temperature and less than a second preset temperature, the time T is 15 seconds; and when the temperature of the outer coil minus the dew point temperature is greater than or equal to a second preset temperature, the time T is 25 seconds. Wherein, the first preset temperature can be-8 ℃, or any temperature in the interval of-9 ℃ and-7 ℃; the second predetermined temperature may be 0 deg.C, or any temperature within the selected interval [ -1 deg.C, 1 deg.C ]. In other words, if the temperature of the external coil minus the dew point temperature is less than or equal to minus 8 ℃, the outdoor fan is controlled to rotate reversely for 10 seconds at set time intervals; if the temperature of the external coil minus the dew point temperature is more than-8 ℃ but less than 0 ℃, controlling the outdoor fan to rotate reversely for 15 seconds at set time intervals; and if the temperature of the external coil minus the dew point temperature is more than or equal to 0 ℃, controlling the outdoor fan to rotate reversely for 25 seconds at set time intervals.
The dew point temperature is the temperature at which the air is cooled to saturation without changing both the moisture content and the air pressure. The setting time can be flexibly set by those skilled in the art according to the practical application scenario of the air conditioner, for example, the setting time can be 2 minutes or 3 minutes, and can also be any time between 1-4 minutes.
In the scheme of the invention, the outdoor fan is controlled to reversely rotate at intervals, namely the reverse rotation time T of the fan is controlled every time when defrosting is carried out, in other words, after frost is melted partially, the frost layer is blown off quickly by utilizing the reverse blowing action of the outdoor fan, so that the defrosting efficiency is improved. And the time T is determined according to the comparison result of the temperature of the external coil and the dew point temperature, namely the time for reversing the outdoor fan is controlled by using the difference value between the temperature of the external coil and the dew point temperature, so that the time for reversing the fan every time is controlled more accurately, a melted frost layer is blown off more accurately and efficiently, and the defrosting efficiency of the air conditioner is greatly improved.
Referring to fig. 1, fig. 1 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, in this embodiment, the method of the present invention comprises the steps of: s110, detecting the temperature of an external coil of the air conditioner; when the temperature of the external coil is lower than the dew point temperature, the step S120 is carried out, and the continuous operation time of the air conditioner in the state is detected; if the continuous operation time is higher than the first preset time, for example, the continuous operation time is higher than 40 minutes (the first preset time may also be any time between 35 and 45 minutes), the method proceeds to step S130, and the air conditioner enters the defrosting mode; after the air conditioner enters the defrosting mode, the process proceeds to step S140, and the outdoor fan reverse rotation time T is controlled at set time intervals. The above description is referred to for step S140, and is not repeated here.
When the temperature of the outer coil is lower than the dew point temperature, the condition that the outer coil is frosted at the moment is met, namely the outer coil is easily frosted at the moment. Therefore, the invention judges whether the defrosting is needed or not by judging the duration time of the temperature of the external coil pipe being lower than the dew point temperature, so that the defrosting time of the air conditioner is more accurate.
It will be understood by those skilled in the art that the above-mentioned manner of determining whether the air conditioner is to enter into defrosting by using the temperature of the external coil is merely an example to illustrate a defrosting control method of the present invention, and those skilled in the art can select other conditions to determine whether the air conditioner is to enter into defrosting without departing from the scope of the present invention.
The defrosting control method of the air conditioner further comprises the step of exiting the defrosting mode. For example, after the air conditioner enters the defrosting mode, the temperature of the external coil of the air conditioner is detected, when the temperature of the external coil is higher than a set temperature (which can be reasonably set by a person skilled in the art according to the practical application scenario of the air conditioner), the continuous operation time of the air conditioner in this state is detected, when the continuous operation time is higher than a second preset time, for example, the continuous operation time is higher than 20 seconds (or any time between 15 and 25 seconds), it can be judged that the frost layer of the external coil has been removed, and at this time, the air conditioner is exited from the defrosting mode.
In summary, the defrosting control method of the air conditioner of the present invention mainly controls the reverse rotation time T of the outdoor fan every set time after the air conditioner enters the defrosting mode, that is, controls the reverse rotation time T of the outdoor fan every defrosting time, in other words, after the frost is melted partially, the frost layer is blown off quickly by the reverse blowing action of the outdoor fan, thereby improving the defrosting efficiency. And the time T is determined according to the comparison result of the temperature of the external coil and the dew point temperature, namely the time for reversing the outdoor fan is controlled by using the difference value between the temperature of the external coil and the dew point temperature, so that the time for reversing the fan every time is controlled more accurately, a melted frost layer is blown off more accurately and efficiently, and the defrosting efficiency of the air conditioner is greatly improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrost control method for an air conditioner, said method comprising the steps of:
after the air conditioner enters a defrosting mode, controlling the reverse rotation time T of the outdoor fan at set time intervals;
wherein the time T is determined as follows:
detecting the temperature of the outer coil;
comparing the outer coil temperature to a dew point temperature;
and determining the time T according to the comparison result.
2. The air conditioner defrost control method of claim 1, wherein the set time is any time between 1-4 minutes.
3. The air conditioner defrost control method of claim 2, wherein the set time is 2 minutes or the set time is 3 minutes.
4. The air conditioner defrost control method according to claim 1, wherein the step of determining the time T according to the comparison result specifically includes:
when the temperature of the outer coil minus the dew point temperature is less than or equal to a first preset temperature, the time T is 10 seconds;
when the temperature of the outer coil minus the dew point temperature is greater than a first preset temperature and less than a second preset temperature, the time T is 15 seconds;
and when the temperature of the outer coil minus the dew point temperature is greater than or equal to a second preset temperature, the time T is 25 seconds.
5. The defrosting control method of an air conditioner according to claim 4, wherein the first preset temperature is any temperature within a range of [ -9 ℃, -7 ℃ ] and the second preset temperature is any temperature within a range of [ -1 ℃, 1 ℃ ].
6. The air conditioner defrost control method of claim 5, wherein the first preset temperature is-8 ℃ and the second preset temperature is 0 ℃.
7. The air conditioner defrosting control method according to any one of claims 1 to 6, wherein before the step of controlling the outdoor fan reverse rotation time T every set time after the air conditioner enters the defrosting mode, the method further comprises:
detecting the temperature of an external coil of the air conditioner;
when the temperature of the external coil is lower than the dew point temperature, detecting the continuous operation time of the air conditioner in the state;
and if the continuous operation time is more than a first preset time, enabling the air conditioner to enter a defrosting mode.
8. The air conditioner defrost control method of claim 7, wherein the first preset time is any time between 35-45 minutes; or the first preset time is 40 minutes.
9. The air conditioner defrost control method according to any one of claims 1 to 6, wherein after the step of controlling the outdoor fan reverse rotation time T every set time after the air conditioner enters the defrost mode, the method further comprises:
when the temperature of the external coil is higher than the set temperature, detecting the continuous operation time of the air conditioner in the state;
and if the continuous operation time is more than a second preset time, enabling the air conditioner to exit the defrosting mode.
10. The air conditioner defrost control method of claim 9, wherein the second preset time is any time between 15-25 seconds; or the second preset time is 20 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940096.8A CN110836460A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810940096.8A CN110836460A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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| CN110836460A true CN110836460A (en) | 2020-02-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2663880Y (en) * | 2003-03-18 | 2004-12-15 | 储维 | Defrosting device for wind heat exchanger |
| CN104515330A (en) * | 2013-09-27 | 2015-04-15 | 海尔集团公司 | Method for controlling defrosting operation of air-conditioner |
| CN104833060A (en) * | 2015-05-22 | 2015-08-12 | 广东美的暖通设备有限公司 | Defrosting control method and device for air conditioner |
| CN105371524A (en) * | 2014-08-26 | 2016-03-02 | 青岛海尔空调器有限总公司 | Compression type refrigerating and heating air conditioner system and outdoor unit defrosting method thereof |
| CN106958926A (en) * | 2017-05-10 | 2017-07-18 | 青岛海尔空调器有限总公司 | Air-conditioner and its defrosting control method |
| JP6274168B2 (en) * | 2015-08-18 | 2018-02-07 | ダイキン工業株式会社 | Air conditioner |
-
2018
- 2018-08-17 CN CN201810940096.8A patent/CN110836460A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2663880Y (en) * | 2003-03-18 | 2004-12-15 | 储维 | Defrosting device for wind heat exchanger |
| CN104515330A (en) * | 2013-09-27 | 2015-04-15 | 海尔集团公司 | Method for controlling defrosting operation of air-conditioner |
| CN105371524A (en) * | 2014-08-26 | 2016-03-02 | 青岛海尔空调器有限总公司 | Compression type refrigerating and heating air conditioner system and outdoor unit defrosting method thereof |
| CN104833060A (en) * | 2015-05-22 | 2015-08-12 | 广东美的暖通设备有限公司 | Defrosting control method and device for air conditioner |
| JP6274168B2 (en) * | 2015-08-18 | 2018-02-07 | ダイキン工業株式会社 | Air conditioner |
| CN106958926A (en) * | 2017-05-10 | 2017-07-18 | 青岛海尔空调器有限总公司 | Air-conditioner and its defrosting control method |
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Application publication date: 20200225 |