CN110836502A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN110836502A CN110836502A CN201810941876.4A CN201810941876A CN110836502A CN 110836502 A CN110836502 A CN 110836502A CN 201810941876 A CN201810941876 A CN 201810941876A CN 110836502 A CN110836502 A CN 110836502A
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- air conditioner
- defrosting
- temperature
- time
- bypass
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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
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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
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, acquiring the temperature Toil of an external coil of the air conditioner; selectively enabling the air conditioner to enter a bypass defrosting mode or a reverse circulation defrosting mode according to the Toil; when the air conditioner enters the bypass defrosting mode, the control is carried out at intervalsThe bypass defrosting circuit is opened/closed, and the outdoor fan is controlled to reversely rotate for set time under the condition that the bypass defrosting circuit is closed; the opening time and the set time of the bypass defrosting circuit are according to tOn the upper part、tIn、tLower partAnd (4) determining. The invention can accurately select the optimal defrosting mode and efficiently blow off the melted frost layer, thereby greatly improving the defrosting efficiency of the air conditioner.
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, the outer coil pipe of the air conditioner is obtainedThe temperature Toil; selectively enabling the air conditioner to enter a bypass defrosting mode or a reverse circulation defrosting mode according to the Toil; when the air conditioner enters a bypass defrosting mode, the bypass defrosting loop is controlled to be opened/closed at intervals, and the outdoor fan is controlled to reversely rotate for a set time under the condition that the bypass defrosting loop is closed; the opening time and the set time of the bypass defrosting circuit are determined as follows: respectively detecting the temperature t of the upper part of the outer coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part(ii) a According to tOn the upper part、tIn、tLower partDetermining an on time of the bypass defrost circuit and the set time.
In a preferred embodiment of the above-mentioned air conditioner defrosting control method, the step of "selectively enabling the air conditioner to enter the bypass defrosting mode or the reverse cycle defrosting mode according to the Toil" specifically includes: and if Toil is less than or equal to the preset temperature, enabling the air conditioner to enter a reverse circulation defrosting mode, otherwise, enabling the air conditioner to enter a bypass defrosting mode.
In a preferred embodiment of the above-described air conditioner defrost control method, "according to tOn the upper part、tIn、tLower partDetermining the opening time and the set time of the bypass defrosting circuit specifically comprises the following steps: if t isOn the upper part、tIn、tLower partIf the values are less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 3 minutes, and the set time is 15 seconds; if t isOn the upper part、tIn、tLower partIf the values of only two of the two are less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 2 minutes, and the set time is 10 seconds; if t isOn the upper part、tIn、tLower partThe value of only one of the two is less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 1 minute, and the set time is 8 seconds.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the preset temperature is any temperature within the interval [ -13, -11 ].
In a preferred embodiment of the above defrosting control method of an air conditioner, the preset temperature is-12 ℃.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, before the step of "obtaining an external coil temperature Toil of the air conditioner when the air conditioner needs to enter a 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 higher 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-described air conditioner defrost control method, the method further includes: detecting the temperature of an external coil of the air conditioner; 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 higher than a second preset time, enabling the air conditioner to exit the defrosting mode.
In a preferred embodiment of the above air conditioner defrosting control method, the second preset time is any time between 15 and 25 seconds.
In a preferred embodiment of the above air conditioner defrosting control method, the second preset time is 20 seconds.
The invention determines whether to adopt the bypass defrosting mode or the reverse circulation defrosting mode according to the temperature of the external coil of the air conditioner, can accurately select the optimal defrosting mode and improve the defrosting efficiency. Further, in the defrosting process of the air conditioner, the opening/closing of the bypass defrosting circuit is controlled at intervals, and the outdoor fan is controlled to reversely rotate for a set time under the condition that the bypass defrosting circuit is closed. Therefore, the reversing of the outdoor fan is staggered with the opening state of the bypass loop, the influence of the reversing of the outdoor fan on bypass defrosting is avoided, the reversing time of the outdoor fan can be controlled more accurately, the back blowing frequency of the outdoor fan is reduced, the outdoor fan can blow off a melted frost layer more accurately and efficiently, and the defrosting efficiency of the air conditioner 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 method of the present invention comprises the steps of: s110, when the air conditioner needs to enter a defrosting mode, acquiring the temperature Toil of an external coil of the air conditioner; s120, selectively enabling the air conditioner to enter a bypass defrosting mode or a reverse circulation defrosting mode according to the Toil; s130, when the air conditioner enters the bypass defrosting mode, the bypass defrosting circuit is controlled to be opened and/or closed at intervalsAnd closing the defrosting device, and controlling the outdoor fan to reversely rotate for set time under the condition that the bypass defrosting circuit is closed. Wherein, the opening time and the set time of the bypass defrosting circuit are determined according to the following modes: respectively detecting the temperature t of the upper part of the outer coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part(ii) a According to tOn the upper part、tIn、tLower partThe open time and the set time of the bypass defrost circuit are determined.
It can be understood by those skilled in the art that the frosting condition of the outdoor unit can be represented by the temperature of the external coil, so that the optimal defrosting mode can be accurately selected by comparing the temperature of the external coil of the air conditioner, and the defrosting efficiency is improved. The outer coil temperature Toil here is to be understood as the temperature value detected at the outlet or inlet of the outer coil. As an example, in step S120, if Toil ≦ the preset temperature, the air conditioner is caused to enter the reverse cycle defrost mode, otherwise the air conditioner is caused to enter the bypass defrost mode. Wherein, the preset value can be-12, or can be any temperature in the interval [ -13, -11 ]. That is, when the temperature of the external coil is low to a certain degree, for example, below-12 ℃, it indicates that the frosting of the outdoor unit is serious, at this time, the air conditioner needs to enter reverse circulation defrosting, that is, the air conditioner needs to be defrosted by force, otherwise, it indicates that the frosting of the outdoor unit is not serious, the air conditioner can enter bypass defrosting.
In step S130, after the air conditioner enters the bypass defrosting mode, the bypass defrosting circuit is controlled to be turned on/off at intervals, and the outdoor fan is controlled to be reversely rotated for a set time in a state where the bypass defrosting circuit is turned off. In other words, the reverse rotation of the outdoor fan is controlled at intervals, the frost layer is blown off rapidly by the reverse blowing action of the outdoor fan, and the bypass defrosting circuit is controlled to be closed correspondingly when the outdoor fan rotates reversely. Therefore, the reversing of the outdoor fan is staggered with the opening state of the bypass loop, the influence of the reversing of the outdoor fan on bypass defrosting is avoided, the reversing time of the outdoor fan can be controlled more accurately, the back blowing frequency of the outdoor fan is reduced, the outdoor fan can blow off a melted frost layer more accurately and efficiently, and the defrosting efficiency of the air conditioner is greatly improved.
As an example, if tOn the upper part、tIn、tLower partWhen the values are less than or equal to 0 ℃, the bypass loop can be controlled to be started for 3 minutes, and the reverse rotation set time of the outdoor fan is 15 seconds; if t isOn the upper part、tIn、tLower partOnly two values are less than or equal to 0 ℃, the starting time of the bypass defrosting loop can be controlled to be 2 minutes, and the set time for reversing the indoor fan is 10 seconds; if t isOn the upper part、tIn、tLower partThe value of only one of the two is less than or equal to 0 ℃, the starting time of the bypass defrosting loop can be controlled to be 1 minute, and the set time of the reverse rotation of the outdoor fan is 8 seconds. The person skilled in the art can also set other opening times and setting times as appropriate according to the actual situation. Temperatures for the three sections of the outer coil, tonneau, and tonneau: as can be understood by those skilled in the art, the temperature of the outer coil pipe is different from top to bottom due to the fact that the refrigerant does not uniformly enter the outer coil pipe, and therefore the temperature of the outer coil pipe at different positions can be detected by arranging the temperature sensors at the upper position, the middle position and the lower position of the outer coil pipe, and the condition that the temperature of the outer coil pipe is different in the defrosting process is taken into consideration.
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; when Toil is less than the dew point temperature, the operation proceeds to step S220, and the continuous operation time of the air conditioner in the state is detected; if the duration time is higher than the first preset time, for example, the duration 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 S230, and the air conditioner enters the defrost mode. After step S230, the above steps S110 to S130 are performed.
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 present invention determines whether to use the bypass defrosting mode or the reverse cycle defrosting mode according to the temperature of the external coil of the air conditioner, so as to accurately select the optimal defrosting mode and improve the defrosting efficiency. Further, in the defrosting process of the air conditioner, the opening/closing of the bypass defrosting circuit is controlled at intervals, and the outdoor fan is controlled to reversely rotate for a set time under the condition that the bypass defrosting circuit is closed. Therefore, the reversing of the outdoor fan is staggered with the opening state of the bypass loop, the influence of the reversing of the outdoor fan on bypass defrosting is avoided, the reversing time of the outdoor fan can be controlled more accurately, the back blowing frequency of the outdoor fan is reduced, the outdoor fan can blow off a melted frost layer more accurately and efficiently, and the defrosting efficiency of the air conditioner 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, acquiring the temperature Toil of an external coil of the air conditioner;
selectively enabling the air conditioner to enter a bypass defrosting mode or a reverse circulation defrosting mode according to the Toil;
when the air conditioner enters a bypass defrosting mode, the bypass defrosting loop is controlled to be opened/closed at intervals, and the outdoor fan is controlled to reversely rotate for a set time under the condition that the bypass defrosting loop is closed;
the opening time and the set time of the bypass defrosting circuit are determined as follows:
respectively detecting the temperature t of the upper part of the outer coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part；
According to tOn the upper part、tIn、tLower partDetermining an on time of the bypass defrost circuit and the set time.
2. The air conditioner defrosting control method according to claim 1, wherein the step of selectively causing the air conditioner to enter the bypass defrosting mode or the reverse cycle defrosting mode according to the Toil includes:
and if Toil is less than or equal to the preset temperature, enabling the air conditioner to enter a reverse circulation defrosting mode, otherwise, enabling the air conditioner to enter a bypass defrosting mode.
3. The defrosting control method of an air conditioner according to claim 2, wherein "according to tOn the upper part、tIn、tLower partDetermining the opening time and the set time of the bypass defrosting circuit specifically comprises the following steps:
if t isOn the upper part、tIn、tLower partIf the values are less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 3 minutes, and the set time is 15 seconds;
if t isOn the upper part、tIn、tLower partChinese herbal medicineIf the two values are less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 2 minutes, and the set time is 10 seconds;
if t isOn the upper part、tIn、tLower partThe value of only one of the two is less than or equal to 0 ℃, the opening time of the bypass defrosting loop is 1 minute, and the set time is 8 seconds.
4. The defrosting control method of an air conditioner according to claim 3, wherein the preset temperature is any temperature within the interval [ -13, -11 ].
5. The air conditioner defrost control method of claim 4, wherein the preset temperature is-12 ℃.
6. The air conditioner defrost control method according to any one of claims 1 to 5, wherein, prior to the step of obtaining an external coil temperature Toil of the air conditioner 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;
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 higher than a first preset time, enabling the air conditioner to enter a defrosting mode.
7. The air conditioner defrost control method of claim 6, wherein the first preset time is any time between 35-45 minutes; or the first preset time is 40 minutes.
8. The air conditioner defrost control method of any one of claims 1-5, further comprising:
detecting the temperature of an external coil of the air conditioner;
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 higher than a second preset time, enabling the air conditioner to exit the defrosting mode.
9. The air conditioner defrost control method of claim 8, wherein the second preset time is any time between 15-25 seconds.
10. The air conditioner defrost control method of claim 9, wherein the second preset time is 20 seconds.
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| CN201810941876.4A CN110836502B (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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Cited By (1)
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| CN111720962A (en) * | 2020-06-09 | 2020-09-29 | 海信（山东）空调有限公司 | Refrigeration and dehumidification control method of variable frequency air conditioner and air conditioning system |
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