CN110836452A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN110836452A CN110836452A CN201810939879.4A CN201810939879A CN110836452A CN 110836452 A CN110836452 A CN 110836452A CN 201810939879 A CN201810939879 A CN 201810939879A CN 110836452 A CN110836452 A CN 110836452A
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- Prior art keywords
- air conditioner
- defrosting
- control method
- outdoor fan
- bypass
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
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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
- 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)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Human Computer Interaction (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 defrosting control method of the air conditioner provided by the invention is directed to the air conditioner with a bypass defrosting loop, and the method comprises the following steps: when the air conditioner needs to enter a defrosting mode, controlling the outdoor fan to stop rotating and starting a bypass defrosting loop; after the outdoor fan stops rotating for the first set time, controlling the outdoor fan to rotate reversely for the second set time, and closing the bypass defrosting loop; and after the outdoor fan rotates reversely for a second set time, starting the bypass defrosting loop for a preset time. According to the invention, when the outdoor fan is controlled to reversely rotate at intervals, the bypass defrosting circuit is correspondingly controlled to be closed, and the bypass defrosting circuit is opened after the reverse rotation is finished for the preset time, so that the reverse rotation of the outdoor fan is staggered with the opening state of the bypass circuit, and the influence of the reverse rotation of the outdoor fan on the bypass defrosting is avoided. Thereby greatly improving the defrosting efficiency.
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
In view of the above problems in the background art, in order to improve the defrosting efficiency of an air conditioner, the present invention provides a defrosting control method of an air conditioner, the air conditioner including a bypass defrosting circuit disposed between a compressor and an outdoor unit of the air conditioner for introducing high-pressure gas discharged from the compressor into the outdoor unit to melt frost on a coil of the outdoor unit, the method including the steps of: when the air conditioner needs to enter a defrosting mode, controlling the outdoor fan to stop rotating and starting a bypass defrosting loop; after the outdoor fan stops rotating for a first set time, controlling the outdoor fan to rotate reversely for a second set time, and closing the bypass defrosting loop; after the outdoor fan rotates reversely for a second set time, the bypass defrosting circuit is started for a preset time; wherein the preset time is less than the first set time.
In a preferred embodiment of the above defrosting control method for an air conditioner, the first set time is any time between 110 and 130 seconds; and/or the second set time is any time between 15 and 25 seconds.
In a preferred embodiment of the above defrosting control method of an air conditioner, the first set time is 120 seconds; and/or the second set time is 20 seconds.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the preset time is any time between 9 and 11 seconds.
In a preferred embodiment of the above-described air conditioner defrost control method, the preset time is 10 seconds.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, before the step of "controlling the outdoor fan to stop rotating and open the bypass defrosting circuit when the air conditioner needs to enter the defrosting mode", the method further comprises: detecting the temperature of an external coil of the air conditioner; and judging whether the air conditioner enters a defrosting mode or not according to the temperature of the outer coil.
In a preferred embodiment of the above-described air conditioner defrosting control method, the step of determining whether to enter the air conditioner into the defrosting mode based on the temperature of the external coil includes: comparing the outer coil temperature to a dew point temperature; and if the value obtained by subtracting the dew point temperature from the temperature of the external coil is less than or equal to a first set value, enabling the air conditioner to enter a defrosting mode.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the first set value is an arbitrary value within a range of [ -6, -4 ]; or the first set value is-5.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, after the step of "when the air conditioner needs to enter the defrosting mode, turning on the bypass defrosting circuit and controlling the outdoor fan to continuously reverse" the method further comprises: detecting the temperature of an external coil of the air conditioner; comparing the outer coil temperature to a dew point temperature; and if the value obtained by subtracting the dew point temperature from the temperature of the external coil is greater than a second set value, enabling the air conditioner to exit the defrosting mode.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the second set value is an arbitrary value within a range of [ -4, -2 ]; or the second set value is-3.
The defrosting control method of the air conditioner mainly comprises the steps of firstly controlling the outdoor fan to stop rotating and starting the bypass defrosting loop after the air conditioner needs to enter a defrosting mode, then controlling the outdoor fan to reversely rotate for a second set time after the outdoor fan stops rotating for more than a first set time, closing the bypass defrosting loop in the process of reversing the outdoor fan, and starting the bypass defrosting loop after the outdoor fan finishes reversing for a preset time. That is, when the outdoor fan is controlled to reversely rotate at intervals, the bypass defrosting circuit is correspondingly controlled to be closed, and the bypass defrosting circuit is opened after the reverse rotation is finished for the preset time, so that the reverse rotation of the outdoor fan is staggered with the opening state of the bypass circuit, the influence of the reverse rotation of the outdoor fan on the bypass defrosting is avoided, and the defrosting efficiency is greatly improved. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
Drawings
FIG. 1 is a main flow chart of the defrosting control method of the air conditioner of the present invention;
fig. 2 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 invention is mainly directed to an air conditioner with a bypass defrosting loop. As will be understood by those skilled in the art, a bypass defrost circuit of an air conditioner is provided between a compressor and an outdoor unit of the air conditioner for introducing high pressure gas discharged from the compressor into the outdoor unit to melt frost on a coil of the outdoor unit. Specifically, in a state that the bypass circuit is opened, high-pressure gas discharged by the compressor can enter the outdoor unit along the bypass circuit to dissolve frost on the coil of the outdoor unit; when the bypass circuit is closed, high-pressure gas discharged by the compressor sequentially flows through the indoor heat exchanger and the outdoor heat exchanger along the heating circuit to perform heating circulation.
Referring to fig. 1, fig. 1 is a main flowchart of a defrosting control method of an air conditioner according to the present invention. As shown in fig. 1, the defrosting control method of an air conditioner of the present invention includes: s110, when the air conditioner needs to enter a defrosting mode, controlling an outdoor fan to stop rotating, and starting a bypass defrosting loop; and S120, after the outdoor fan stops rotating for the first set time, controlling the outdoor fan to rotate reversely for the second set time, and closing the bypass defrosting loop. And S130, after the outdoor fan rotates reversely for a second set time, starting the bypass defrosting loop for a preset time. Wherein the preset time is less than the first set time. As an example, the first set time may be 120 seconds, or any time between 110 seconds and 130 seconds is selected; the second set time may be 20 seconds or any time between 15 and 25 seconds may be selected. The skilled person can also flexibly select other reasonable setting time according to the actual application scenario.
In the control method of the invention, the outdoor fan is controlled to reversely rotate at intervals, namely the fan is controlled to reversely rotate for a period of time every time when defrosting is carried out, namely, after frost is melted for a part, the frost layer is quickly blown off by utilizing the reverse blowing action of the outdoor fan, thereby improving the defrosting efficiency. And the bypass defrosting circuit is closed in the process of reversing the outdoor fan, and is opened after the outdoor fan finishes reversing for the preset time. As an example, the preset time may be 10 seconds, or may be any time between 9 seconds and 11 seconds, and those skilled in the art may select other reasonable preset times according to actual scenarios.
It can be understood by those skilled in the art that if the outdoor fan is controlled to reversely rotate in the state that the bypass defrosting circuit is opened, it may have a certain influence on the defrosting operation of the air conditioner, so that the present invention controls the bypass defrosting circuit to be closed correspondingly when the outdoor fan is controlled to reversely rotate at intervals, and opens the bypass defrosting circuit after the reverse rotation is finished for a preset time, so that the reverse rotation of the outdoor fan is staggered from the open state of the bypass circuit, and the influence of the reverse rotation of the outdoor fan on the bypass defrosting is avoided.
Referring to fig. 2, fig. 2 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present invention. As shown in fig. 2, in this embodiment, the specific steps of the present invention are as follows: s210, detecting the temperature Toil of an external coil of the air conditioner; s220, comparing the temperature Toil of the outer coil with the dew point temperature Te, if Toil-Te is less than or equal to a first set value, enabling the air conditioner to enter a defrosting mode, and executing the step S230 to enable the air conditioner to enter the defrosting mode; otherwise, the process returns to step S210. After step S230, the above-described steps S110 to S130 are performed. The first setting value can be set reasonably by those skilled in the art according to the specific use scenario of the air conditioner, for example, the first setting value can be-5, or the first setting value can be any value within the range of [ -6, -4 ].
In this embodiment, the dew point temperature refers to the temperature at which the air is cooled to saturation without changing both the moisture content and the air pressure. That is, when the temperature of the outer coil is lower than the dew point temperature to a certain degree, for example, the temperature of the outer coil is lower than the dew point temperature by more than-5 ℃, it indicates that the outer coil meets the condition of frosting, that is, the outer coil is easily frosted. Therefore, the embodiment judges whether the air conditioner needs to enter the defrosting mode by comparing the temperature of the external coil with the dew point temperature, so that the defrosting time of the air conditioner is more accurate.
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 Toil of the external coil of the air conditioner is detected, then the temperature Toil of the external coil is compared with the dew point temperature Te, and if the Toil-Te is larger than a second set value, the air conditioner is exited from the defrosting mode. The second setting value can be set reasonably by those skilled in the art according to the specific use scenario of the air conditioner, for example, the second setting value can be set to-3, or the second setting value can also be any value within the interval [ -4, -2 ]. It will be understood by those skilled in the art that the temperature of the outer coil will gradually increase as the frost layer decreases, and that when the temperature of the outer coil increases to a certain extent, for example, a temperature less than the dew point temperature, indicating that the frost on the outer coil has been substantially removed, the air conditioner may be caused to promote defrosting.
In summary, the air conditioner defrosting control method of the present invention is mainly characterized in that after the air conditioner needs to enter the defrosting mode, the outdoor fan is controlled to stop rotating and the bypass defrosting loop is opened, then the outdoor fan is controlled to reverse for a second set time after the outdoor fan stops rotating and exceeds the first set time, the bypass defrosting loop is closed in the process of reversing the outdoor fan, and the bypass defrosting loop is opened after the outdoor fan reverses for the preset time. That is, when the outdoor fan is controlled to reversely rotate at intervals, the bypass defrosting circuit is correspondingly controlled to be closed, and the bypass defrosting circuit is opened after the reverse rotation is finished for the preset time, so that the reverse rotation of the outdoor fan is staggered with the opening state of the bypass circuit, the influence of the reverse rotation of the outdoor fan on the bypass defrosting is avoided, and the defrosting efficiency is greatly improved. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
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 defrosting control method of an air conditioner includes a bypass defrosting circuit provided between a compressor and an outdoor unit of the air conditioner for introducing high pressure gas discharged from the compressor into the outdoor unit to melt a frost layer on a coil of the outdoor unit,
characterized in that the method comprises the following steps:
when the air conditioner needs to enter a defrosting mode, controlling the outdoor fan to stop rotating and starting a bypass defrosting loop;
after the outdoor fan stops rotating for a first set time, controlling the outdoor fan to rotate reversely for a second set time, and closing the bypass defrosting loop;
after the outdoor fan rotates reversely for a second set time, the bypass defrosting circuit is started for a preset time;
wherein the preset time is less than the first set time.
2. The defrosting control method of an air conditioner according to claim 1, wherein the first set time is any time between 110 and 130 seconds; and/or
The second set time is any time between 15 and 25 seconds.
3. The air conditioner defrost control method of claim 2, wherein the first set time is 120 seconds; and/or
The second set time is 20 seconds.
4. The air conditioner defrost control method of claim 3, wherein the preset time is any time between 9-11 seconds.
5. The air conditioner defrost control method of claim 4, wherein the preset time is 10 seconds.
6. The air conditioner defrost control method of claim 1, wherein before the step of controlling the outdoor fan to stop rotating and to turn on the bypass defrost circuit when the air conditioner needs to enter the defrost mode, the method further comprises:
detecting the temperature of an external coil of the air conditioner;
and judging whether the air conditioner enters a defrosting mode or not according to the temperature of the outer coil.
7. The air conditioner defrosting control method according to claim 4, wherein the step of determining whether to put the air conditioner into the defrosting mode according to the temperature of the external coil includes:
comparing the outer coil temperature to a dew point temperature;
and if the value obtained by subtracting the dew point temperature from the temperature of the external coil is less than or equal to a first set value, enabling the air conditioner to enter a defrosting mode.
8. The defrosting control method of an air conditioner according to claim 5, wherein the first set value is an arbitrary value within a range of [ -6, -4 ]; or the first set value is-5.
9. The air conditioner defrost control method of any one of claims 1-8, wherein after the step of turning on a bypass defrost circuit and controlling the outdoor fan to continuously reverse when the air conditioner needs to enter a defrost mode, the method further comprises:
detecting the temperature of an external coil of the air conditioner;
comparing the outer coil temperature to a dew point temperature;
and if the value obtained by subtracting the dew point temperature from the temperature of the external coil is greater than a second set value, enabling the air conditioner to exit the defrosting mode.
10. The defrosting control method of an air conditioner according to claim 8, wherein the second set value is an arbitrary value within a range of [ -4, -2 ]; or the second set value is-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939879.4A CN110836452A (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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| CN201810939879.4A CN110836452A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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| CN110836452A true CN110836452A (en) | 2020-02-25 |
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| CN201810939879.4A Pending CN110836452A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007170695A (en) * | 2005-12-19 | 2007-07-05 | Corona Corp | Heat pump device |
| CN101140123A (en) * | 2006-09-07 | 2008-03-12 | 日立空调·家用电器株式会社 | Air conditioner |
| JP2009243756A (en) * | 2008-03-31 | 2009-10-22 | Daikin Ind Ltd | Defrosting device of heat exchanger |
| CN203857622U (en) * | 2014-02-17 | 2014-10-01 | 海尔集团公司 | Air conditioning system provided with compressor and waste heat recovery and defrosting device |
| CN106352629A (en) * | 2016-08-22 | 2017-01-25 | 珠海格力电器股份有限公司 | Air conditioner and bypass heating defrosting control method thereof |
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2018
- 2018-08-17 CN CN201810939879.4A patent/CN110836452A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007170695A (en) * | 2005-12-19 | 2007-07-05 | Corona Corp | Heat pump device |
| CN101140123A (en) * | 2006-09-07 | 2008-03-12 | 日立空调·家用电器株式会社 | Air conditioner |
| JP2009243756A (en) * | 2008-03-31 | 2009-10-22 | Daikin Ind Ltd | Defrosting device of heat exchanger |
| CN203857622U (en) * | 2014-02-17 | 2014-10-01 | 海尔集团公司 | Air conditioning system provided with compressor and waste heat recovery and defrosting device |
| CN106352629A (en) * | 2016-08-22 | 2017-01-25 | 珠海格力电器股份有限公司 | Air conditioner and bypass heating defrosting control method thereof |
Non-Patent Citations (1)
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| 姜红艳: "《何嫂百事通》", 30 June 1997, 中国地质大学出版社 * |
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