CN110836441B - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN110836441B CN110836441B CN201810939703.9A CN201810939703A CN110836441B CN 110836441 B CN110836441 B CN 110836441B CN 201810939703 A CN201810939703 A CN 201810939703A CN 110836441 B CN110836441 B CN 110836441B
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- 238000010257 thawing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000007664 blowing Methods 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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
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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
- 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
- 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
Landscapes
- 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)
- 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 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 according to the following mode: detecting the temperature of the external environment and the temperature t of the upper part of the external coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part(ii) a Based on the external ambient temperature, according to tOn the upper part、tInAnd tLower partThe time T is determined. The invention utilizes the back blowing function of the outdoor fan to quickly blow off the frost layer, thereby improving the defrosting efficiency. This time T is confirmed according to the temperature of three positions on external environment temperature and the outer coil pipe, has taken into account the different condition of outer coil pipe temperature variation in the defrosting process to more accurately control the time of fan reversal at every turn, blow off the frost layer that melts more accurately, high-efficiently, greatly promote the defrosting efficiency of 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
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 external environment and the temperature t of the upper part of the external coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part(ii) a Based on the external ambient temperature, according to tOn the upper part、tInAnd tLower partThe time T is determined.
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-described air conditioner defrost control method, "based on the outside ambient temperature, according to tOn the upper part、tInAnd tLower partThe step of determining the time T "specifically includes: when the external environment temperature is within a set temperature range and t isOn the upper part、tInAnd tLower partThe time T is 10 seconds when the temperature of (a) is less than or equal to a first preset temperature; when t isOn the upper part、tInAnd tLower partWhen the temperature of only two of the temperature sensors is less than or equal to a first preset temperature, the time T is 15 seconds; when the external environment temperature is outside the set temperature range and t isOn the upper part、tInAnd tLower partIs less than or equal to the first 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 [ -6 ℃, -4 ℃ ]; and/or the set temperature interval is [ -5 ℃, 5 ℃ ].
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset temperature is-5 ℃.
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. The time T is based on the outside ambient temperature and the temperature of the three locations on the outside coil (i.e., TOn the upper part、tInAnd tLower part) Determining, i.e. using, the external ambient temperature and tOn the upper part、tInAnd tLower partThe time length of the reverse rotation of the outdoor fan is controlled by the double judgment standard of the temperature, and the condition that the temperature change of the external coil pipe is different in the defrosting process is taken into consideration, so that the time of the reverse rotation of the fan at each time is controlled more accurately, the 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 external environment and the temperature t of the upper part of the external coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part(ii) a Based on the external ambient temperature, according to tOn the upper part、tInAnd tLower partThe time T is determined. For example, when the external environment temperature is within the set temperature range, and tOn the upper part、tInAnd tLower partWhen the temperature of (a) is less than or equal to a first preset temperature, the time T is 10 seconds; when t isOn the upper part、tInAnd tLower partWhen the temperature of only two of the temperature sensors is less than or equal to the first preset temperature, the time T is 15 seconds; when the external environment temperature is outside the set temperature range, and tOn the upper part、tInAnd tLower partWhen the temperature of only one of the two is less than or equal to the first preset temperature, the time T is 25 seconds. Wherein the first preset temperature can be-5 deg.C, or-6 deg.C and-4 deg.C]Any temperature within; setting the interval at-5 deg.C and 5 deg.C]. In other words, if the external ambient temperature is at-5 deg.C, 5 deg.C]In, and tOn the upper part、tInAnd tLower partThe temperature of the outdoor fan is less than or equal to minus 5 ℃, and the outdoor fan is controlled to rotate reversely for 10 seconds at set time intervals; if t isOn the upper part、tInAnd tLower partOnly two (e.g. t)On the upper partAnd tInOr, tOn the upper partAnd tLower partOr, tLower partAnd tIn) The temperature is less than or equal to minus 5 ℃, and the outdoor fan is controlled to rotate reversely for 15 seconds at set time intervals; if the external environment temperature is at-5 deg.C and 5 deg.C]Outer, and tOn the upper part、tInAnd tLower partOnly one (e.g. t)On the upper partOr tInOr tLower part) The temperature of the air conditioner is less than or equal to 0 ℃, and the outdoor fan is controlled to rotate reversely for 25 seconds at set time intervals.
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. Temperature t about three parts of the outer coilOn the upper part、tInAnd tLower part: as can be understood by those skilled in the art, since the refrigerant does not uniformly enter the outer coil pipe, the temperature of the outer coil pipe is different from top to bottom, therefore, the temperature of the outer coil pipe at different positions can be detected by arranging temperature sensors at the upper, middle and lower positions of the outer coil pipe, and then the temperature is detected according to tOn the upper part、tInAnd tLower partThe reverse rotation time of the air conditioner is judged according to the temperature, so that the conditions of different temperature changes of the external coil pipe in the defrosting process are considered.
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. The time T is based on the outside ambient temperature and the temperature of the three locations on the outside coil (i.e., TOn the upper part、tInAnd tLower part) Determining, i.e. using, the external ambient temperature and tOn the upper part、tInAnd tLower partThe time length of the reverse rotation of the outdoor fan is controlled by the double judgment standard of the temperature, and the condition that the temperature change of the external coil pipe is different in the defrosting process is taken into consideration, so that the time of the reverse rotation of the fan at each time is controlled more accurately, the 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.
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, it indicates that the outer coil is in the condition of frosting, i.e. the outer coil is easy to frost. 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 second preset temperature (the second preset temperature 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 the state is detected, when the continuous operation time is higher than the 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 outdoor coil is 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. The time T is based on the outside ambient temperature and the temperature of the three locations on the outside coil (i.e., TOn the upper part、tInAnd tLower part) Determining, i.e. using, the external ambient temperature and tOn the upper part、tInAnd tLower partTemperature of the air conditionerThe time length of machine reversal has taken into account the different condition of outer coil pipe temperature variation in the defrosting process to more accurately control the time of fan reversal at every turn, blow off the frost layer that melts more accurately, high-efficiently, greatly promote the defrosting efficiency of air conditioner.
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 (9)
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 so that the frost layer is quickly blown off by utilizing the reverse blowing action of the outdoor fan after the frost is partially melted each time;
wherein the time T is determined as follows:
detecting the temperature of the external environment and the temperature t of the upper part of the external coilOn the upper partTemperature t of the middle part of the outer coilInTemperature t of lower part of outer coilLower part;
Based on the external ambient temperature, according to tOn the upper part、tInAnd tLower partDetermining the time T;
wherein "based on the outside ambient temperature, according to tOn the upper part、tInAnd tLower partThe step of determining the time T "specifically includes:
when the external environment temperature is within a set temperature range and t isOn the upper part、tInAnd tLower partThe time T is 10 seconds when the temperature of (a) is less than or equal to a first preset temperature;
when t isOn the upper part、tInAnd tLower partWhen the temperature of only two of the two is less than or equal to the first preset temperatureThe time T is 15 seconds;
when the external environment temperature is outside the set temperature range and t isOn the upper part、tInAnd tLower partIs less than or equal to the first preset temperature, the time T is 25 seconds.
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 defrosting control method of an air conditioner according to claim 1, wherein the first preset temperature is any temperature within a range of [ -6 ℃, -4 ℃ ]; and/or
The set temperature interval is [ -5 ℃, 5 ℃ ].
5. The air conditioner defrost control method of claim 4, wherein the first preset temperature is-5 ℃.
6. The air conditioner defrosting control method according to any one of claims 1 to 5, 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.
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 according to any one of claims 1 to 5, 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.
9. The air conditioner defrost control method of claim 8, wherein the second preset time is any time between 15-25 seconds; or the second preset time is 20 seconds.
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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 |
CN108195027A (en) * | 2017-12-27 | 2018-06-22 | Tcl空调器(中山)有限公司 | Defrosting control method, air conditioner and the computer readable storage medium of air conditioner |
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