CN110454916B - Defrosting method of air conditioner and air conditioner - Google Patents
Defrosting method of air conditioner and air conditioner Download PDFInfo
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- CN110454916B CN110454916B CN201910765338.9A CN201910765338A CN110454916B CN 110454916 B CN110454916 B CN 110454916B CN 201910765338 A CN201910765338 A CN 201910765338A CN 110454916 B CN110454916 B CN 110454916B
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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
- 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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting method of an air conditioner and the air conditioner, wherein the defrosting method comprises the steps of recording the minimum temperature tmin of an outdoor unit of the air conditioner within the time interval from T0 to T1 when a compressor of the air conditioner is started, judging the temperature T of the outdoor unit of the air conditioner after the compressor of the air conditioner works for T2 time, defrosting when the T is less than a first preset temperature m1 and the tmin-T is greater than or equal to a first preset temperature difference delta T1, judging the temperature T of the outdoor unit of the air conditioner after the compressor of the air conditioner works for T3 time, starting defrosting when the T is less than a second preset temperature m2 and the tmin-T is greater than or equal to a second preset temperature difference delta T2, and stopping defrosting when the T is higher than a stopping temperature m0 in the defrosting process. According to the defrosting method disclosed by the invention, the air conditioner can enter into defrosting at a higher defrosting temperature when the air conditioner starts to work, so that the defrosting effect is ensured, and meanwhile, even if the working time of the air conditioner is prolonged, the defrosting temperature is reduced, the defrosting efficiency is ensured, and the electricity is saved.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a defrosting method of an air conditioner and the air conditioner.
Background
In the related art, when the air conditioner is operated in winter, due to heat release of an outdoor unit of the air conditioner, the surface temperature of the outdoor unit can reach below zero degree to cause frosting, and a thick frost layer can cause air flow obstruction to influence the heating capacity of the air conditioner. Therefore, defrosting of the air conditioner is required.
In the existing defrosting method of the air conditioner, the temperature condition for entering into defrosting is single, only a constant temperature condition is set, meanwhile, the coil temperature of an indoor unit of the air conditioner and the temperature of an outdoor unit need to be measured simultaneously, and whether the air conditioner needs to be defrosted is judged according to the difference value between the coil temperature of the indoor unit and the temperature of the outdoor unit. The defrosting method needs to arrange temperature measuring devices on the coil pipe and the outdoor unit at the same time, and the structure is complex. In addition, in actual use, the actual defrosting effect of the defrosting method is not good, and particularly, when the defrosting method is used in a low-temperature area with high relative humidity, the outdoor unit still often frosts, so that the existing defrosting method needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. In view of the above technical problems, the applicant has found through research that the frosting phenomenon of the air conditioner is not only related to the temperature but also related to the humidity, and the frosting can occur at higher temperature when the humidity is higher.
In view of the above research results, the first aspect of the present invention provides a defrosting method capable of improving defrosting effect at least to some extent.
The invention also provides an air conditioner for defrosting by using the defrosting method.
The defrosting method according to the first aspect of the invention comprises the following steps: recording the minimum temperature tmin of the outdoor unit of the air conditioner within the time between T0 and T1 of the starting of the compressor of the air conditioner; after the compressor of the air conditioner works for T2 time, judging the temperature T of the outdoor unit of the air conditioner, and defrosting when the T is less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1; after the compressor of the air conditioner works for T3 time, judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting when the T is less than a second preset temperature m2 and tmin-T is greater than or equal to a second preset temperature difference delta T2; stopping defrosting when the t is higher than a stopping temperature m0 in the defrosting process; wherein T0 is more than T1 and more than T2 and more than T3, m2 is more than m1, and delta T2 is more than delta T1.
According to the defrosting method of the first aspect of the invention, the air conditioner can enter into defrosting at a higher defrosting temperature when the air conditioner starts to work, so that the defrosting effect is ensured, and even if the working time of the air conditioner is prolonged, the defrosting temperature is reduced, the defrosting efficiency is ensured, and the electricity is saved.
According to the defrosting method, the defrosting method further comprises the following steps: and after the compressor of the air conditioner works for T4 time, judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting after the T is less than a third preset temperature m3 for T10, wherein T3 is less than T4, and m3 is less than m 2.
Further, the defrosting method further comprises the following steps: and after the compressor of the air conditioner works for T5 time, judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting after the T is less than a fourth preset temperature m4, wherein T3 is more than T4 and less than T5, and m4 is more than m 3.
Further, the defrosting method further comprises the following steps: and after the compressor of the air conditioner works for T5 time, judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting after the T is less than a fourth preset temperature m4, wherein T3 is less than T5, and m4 is less than m 2.
Optionally, the defrosting method further comprises: and after the compressor of the air conditioner works for T6 time, judging the outdoor temperature n and the temperature T of the outdoor unit of the air conditioner, and starting defrosting when the T is less than a fifth preset temperature m5 and 0.5 x n-T is greater than a third preset temperature difference delta T3.
Further, the T1 < T6 < T2.
Further, the T0 ═ 10min, the T1 ═ 15min, and the T6 ═ 30 min.
Further, the defrosting method further comprises the following steps: and judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting after the time T is less than a sixth preset temperature m6 for a duration T11.
Further, the m4 ═ 15 ℃.
An air conditioner according to a second aspect of the present invention includes: the refrigerator comprises an outdoor unit, a compressor, a defrosting part, a timing module, a control module and a temperature measuring module, wherein the compressor, the timing module, the temperature measuring module and the defrosting part are all connected with the control module, and the control module is suitable for starting the timing module while starting the compressor; when the control module receives a timing signal fed back by the timing module and is between T0 and T1, the control module is suitable for recording the minimum tmin of the temperature T of the outdoor unit measured by the temperature measuring module; when the control module receives a timing signal fed back by the timing module and is greater than or equal to T2, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1; when the control module receives a timing signal fed back by the timing module and is greater than or equal to T3, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a second preset temperature m2 and tmin-T is greater than or equal to a second preset temperature difference delta T2; the control module is suitable for closing the defrosting part to stop defrosting when the t is judged to be higher than a stop temperature m 0; wherein T0 is more than T1 and more than T2 and more than T3, m2 is more than m1, and delta T2 is more than delta T1.
According to the air conditioner of the second aspect of the present invention, when the air conditioner starts to operate, the air conditioner can enter into defrosting at a higher defrosting temperature, so that a defrosting effect is ensured, and even if the operating time of the air conditioner is prolonged, the temperature of entering into defrosting is reduced, so that a defrosting efficiency is ensured, and power saving is achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a defrosting method of an air conditioner according to a first embodiment of the present invention;
fig. 2 is a flowchart of a defrosting method of an air conditioner according to a second embodiment of the present invention;
fig. 3 is a flowchart of a defrosting method of an air conditioner according to a third embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described below with reference to specific embodiments in conjunction with the accompanying drawings.
The defrosting method according to the embodiment of the present invention will be described with reference to fig. 1 to 3. When the air conditioner heats the indoor, the indoor unit of the air conditioner needs to heat the indoor, the outdoor unit of the air conditioner needs to absorb heat to the outdoor, and the temperature near the outdoor unit is reduced when the air conditioner heats, so that the surface of the outdoor unit is easy to frost. Therefore, defrosting of the air conditioner is generally performed when the air conditioner is heating.
As shown in fig. 1 to 3, a defrosting method according to an embodiment of the present invention may include:
recording the minimum temperature tmin of the outdoor unit of the air conditioner within the time between T0 and T1(T0 < T1) of the starting of the compressor of the air conditioner, wherein tmin represents the frosting condition of the outdoor unit when the air conditioner starts to work.
After the compressor of the air conditioner works for T2 time (T1 is less than T2), judging the temperature T of the outdoor unit of the air conditioner, and defrosting when T is less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1. The first preset temperature m1 is the frosting temperature of the air conditioner at the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold, and when the compressor of the air conditioner is operated for the time T2, m1 can be obtained through simulation experiments.
When t is less than m1, it indicates that the outdoor unit is at a temperature lower than the frosting temperature of the area under the average relative humidity per year, and the outdoor unit may frost. At this time, if tmin-T is greater than or equal to the first preset temperature difference Δ T1, it indicates that the temperature of the outdoor unit decreases significantly when the outdoor unit operates from T1 to T2, and at this time, it can be determined that the frosting amount of the outdoor unit increases significantly, so that the outdoor unit can be defrosted. The Δ T1 can be determined by an indoor experiment, that is, after the compressor of the air conditioner is operated for T2 time in the experiment, an experimenter obtains a temperature difference value which needs to be frosted by observing the frosting condition on the surface of the outdoor unit.
And after the compressor of the air conditioner is operated for T3 time (T2 is less than T3), judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting when T is less than a second preset temperature m2(m2 is less than m1) and tmin-T is greater than or equal to a second preset temperature difference delta T2 (delta T2 is greater than delta T1). The second preset temperature m2 is the frosting temperature of the air conditioner at the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold, and when the compressor of the air conditioner is operated for the time T3, m2 can be obtained through simulation experiments.
When t is less than m2, it indicates that the outdoor unit is at a temperature lower than the frosting temperature of the area under the average relative humidity per year, and the outdoor unit may frost. At this time, if tmin-T is greater than or equal to the second preset temperature difference Δ T2, it is indicated that the temperature of the outdoor unit decreases significantly when the outdoor unit operates from T2 to T3, and at this time, it can be determined that the frosting amount of the outdoor unit increases significantly, so that the outdoor unit can be defrosted. The Δ T2 can be determined by an indoor experiment, that is, after the compressor of the air conditioner is operated for T3 time in the experiment, an experimenter obtains a temperature difference value which needs to be frosted by observing the frosting condition on the surface of the outdoor unit.
When the defrosting process is carried out, t is higher than the stopping temperature m0, which indicates that the frost on the surface of the outdoor unit is melted to a degree that the outdoor unit can work normally, and the air conditioner stops defrosting. m0 can be judged by indoor experiments, that is, when the air conditioner defrosts in the experiment, experimenters obtain the temperature value which can stop defrosting by observing the frosting condition on the surface of the outdoor unit.
According to the defrosting method provided by the embodiment of the invention, different defrosting temperature conditions are set at different working time of the air conditioner, so that the outdoor unit can enter defrosting at a higher defrosting temperature by setting a higher m1 when the air conditioner starts to work (namely after T2), the defrosting effect is ensured, and meanwhile, the defrosting temperature is reduced even if the working time of the air conditioner is prolonged, the defrosting efficiency is ensured, and the electricity is saved.
In some optional embodiments of the present invention, as shown in fig. 1 to 3, the defrosting method further comprises: after the compressor of the air conditioner continues to work for T4 time (T3 < T4), the temperature T of the outdoor unit of the air conditioner is judged, and when the temperature T is lower than a third preset temperature m3 (the third preset temperature m3 is the atmospheric pressure and the annual average relative humidity of an area where the air conditioner is sold), and when the frosting temperature of the compressor of the air conditioner is at T4 time, m3 can be obtained through a simulation experiment, and m3 < m2) lasts for T10 time, the frosting of the outdoor unit is serious at the moment, and the air conditioner starts to defrost. Because the difference between the time T4 and the time T1 is large, the reference value of tmin is not large, and the temperature difference condition of tmin-T does not need to be set at the moment, so that the judgment logic is simplified. Specifically, T10 may be 3 min.
Specifically, the defrosting method further comprises the following steps: after the compressor of the air conditioner works for T5 time (T4 is less than T5 or T3 is less than T5), the temperature T of the outdoor unit of the air conditioner is judged, defrosting is started after T is less than a fourth preset temperature m4(m4 is less than m3), and meanwhile after T5 time, due to the fact that the working time of the compressor is long and a large amount of frosting is likely to occur, at the moment, it is not needed to wait for T to be less than the preset temperature duration time. Because the difference between the time T5 and the time T1 is large, the reference value of tmin is not large, and the temperature difference condition of tmin-T does not need to be set at the moment, so that the judgment logic is simplified. In some specific embodiments, m4 ═ 15 ℃.
Optionally, the defrosting method further comprises: after the compressor of the air conditioner is operated for time T6, the outdoor temperature n and the temperature T of the outdoor unit of the air conditioner are determined, and for example, an outdoor temperature sensor or the like for measuring the outdoor temperature may be provided in the outdoor unit or the like. And starting defrosting when T is less than a fifth preset temperature m5 and 0.5 x n-T is greater than a third preset temperature difference delta T3, wherein the fifth preset temperature m5 is the frosting temperature of the air conditioner at the time of the compressor working for T6 under the atmospheric pressure and the annual average relative humidity of the area where the air conditioner is sold, and m5 can be obtained through simulation experiments. The third preset temperature difference Δ t3 is a temperature difference between the outdoor unit and the outdoor temperature when the outdoor unit is frosted seriously under atmospheric pressure and annual average relative humidity in an area where the air conditioner is sold, and Δ t3 can be obtained through a simulation experiment.
Therefore, the defrosting of the air conditioner bars can be obtained through the outdoor temperature and the outdoor unit temperature, and the defrosting degree is more accurately judged.
Specifically, T1 < T6 < T2. Namely, the defrosting judgment condition after the time T6 when the compressor of the air conditioner works is obtained after tmin is recorded, so that tmin can be accurately obtained, and the effective reference to the value tmin-T can be conveniently carried out during defrosting under other conditions of the embodiment. Meanwhile, the defrosting judgment condition after the compressor of the air conditioner works for T6 time and the judgment condition of the outdoor unit temperature are carried out simultaneously, and defrosting is carried out as long as one condition of the defrosting judgment condition and the judgment condition of the outdoor unit temperature is met, so that the phenomenon that the outdoor unit frosts seriously to influence the work is avoided.
Specifically, T0 ═ 10min, T1 ═ 15min, and T6 ═ 30 min. In other words, tmin is obtained between 10min and 15min after the compressor of the air conditioner is started, so that tmin is measured when the air conditioner starts to operate, and meanwhile, the defrosting judgment condition after the time T6 when the compressor of the air conditioner is operated is also started immediately after the compressor is operated, and defrosting is performed in time.
Specifically, the defrosting method further comprises the following steps: and judging the temperature T of the outdoor unit of the air conditioner, and starting defrosting after the time T is less than the sixth preset temperature m6 for the duration time T11. Therefore, the judgment condition is suitable for a cold region (for example, a region with the annual average temperature below-10 ℃ in winter), the sixth preset temperature m6 is the frosting temperature of the region where the air conditioner is sold under the atmospheric pressure and the annual average relative humidity, and m6 can be obtained through simulation experiments. For example, T11 may be 3 min.
Specifically, when the air conditioner is in a cold region (for example, a region with the annual average temperature below-10 ℃ in winter), m1 and m0 can be simultaneously improved (for example, simultaneously improved by 4 ℃) and the defrosting efficiency (for example, the two-stage defrosting efficiency) is improved, so that the defrosting effect is enhanced and the defrosting time is prolonged.
Fig. 1 shows a defrosting method for an air conditioner in a hot area (for example, an area having an average temperature of 10 ℃ or higher in winter, for example, a low-altitude area such as the middle east). Fig. 2 shows a defrosting method of an air conditioner in a warm area (e.g., an area having an average temperature of-5 to 10 c in winter, such as a mid-latitude area of beijing). Fig. 3 shows a defrosting method of an air conditioner in a severe cold region (e.g., a region having an average temperature of-5 ℃ or less in winter, such as a high altitude region in northern europe). The present application also includes other embodiments than those shown in fig. 1-3, and the specific defrosting condition can be adjusted adaptively according to the local temperature and humidity.
An air conditioner according to an embodiment of the present invention is described below.
The air conditioner of the embodiment of the invention comprises: the outdoor unit, the compressor, the defrosting part, the timing module, the control module and the temperature measuring module are all connected with the control module, and the control module is suitable for starting the timing module while starting the compressor.
When the control module receives the timing signal fed back by the timing module from T0 to T1, the control module is adapted to record the minimum tmin of the temperature T of the outdoor unit measured by the temperature measuring module.
When the control module receives a timing signal fed back by the timing module and is greater than or equal to T2, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1.
When the control module receives a timing signal fed back by the timing module and is greater than or equal to T3, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a second preset temperature m2 and the tmin-T is greater than or equal to a second preset temperature difference delta T2.
The control module is adapted to close the defrosting portion to stop defrosting when it is determined that t is higher than the stop temperature m 0. Wherein T0 is more than T1 and more than T2 and more than T3, m2 is more than m1, and delta T2 is more than delta T1.
According to the air conditioner provided by the embodiment of the invention, the air conditioner can enter into defrosting at a higher defrosting temperature when the air conditioner starts to work, so that the defrosting effect is ensured, and meanwhile, even if the working time of the air conditioner is prolonged, the temperature entering into defrosting is reduced, the defrosting efficiency is ensured, and the electricity is saved.
Specifically, the defrosting unit may include a defrosting circuit, the timing module may be a timer, the control module may be a controller, and the temperature measuring module may be a temperature sensor installed on the outdoor unit (e.g., on a condensation duct of the outdoor unit).
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A defrosting method of an air conditioner, wherein the air conditioner comprises an outdoor unit and a compressor arranged in the outdoor unit, and the defrosting method is characterized by comprising the following steps:
recording the minimum temperature tmin of the outdoor unit within the time between the starting T0 and the starting T1 of the compressor;
after the compressor works for T2 time, the temperature T of the outdoor unit is judged, and when the T is less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1, the outdoor unit is controlled to be started for defrosting; the first preset temperature m1 is the frosting temperature of the air conditioner when the compressor of the air conditioner works for T2 time under the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold;
after the compressor works for T3 time, the temperature T of the outdoor unit is judged, and when the T is less than a second preset temperature m2 and tmin-T is greater than or equal to a second preset temperature difference delta T2, the outdoor unit is controlled to be started for defrosting; the second preset temperature m2 is the frosting temperature of the air conditioner when the compressor of the air conditioner works for T3 time under the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold;
after the outdoor unit is started to defrost, judging whether the t is higher than a stop temperature m0, if so, controlling the outdoor unit to stop defrosting;
wherein T0 is more than T1 and more than T2 and more than T3, m2 is more than m1, and delta T2 is more than delta T1;
after the compressor of the air conditioner works for T6 time, judging the outdoor temperature n and the temperature T of the outdoor unit of the air conditioner, and if the T is less than a fifth preset temperature m5 and 0.5 x n-T is greater than a third preset temperature difference delta T3, controlling the outdoor unit to be opened for defrosting; the T1 < T6 < T2; the fifth preset temperature m5 is a frosting temperature of the air conditioner during the time T6 when the compressor is operated.
2. The defrosting method of an air conditioner according to claim 1, further comprising: and after the compressor works for T4 time, judging the temperature T of the outdoor unit, and controlling the outdoor unit to be started for defrosting after the T is less than a third preset temperature m3 duration time T10, wherein T3 is less than T4, and m3 is less than m 2.
3. The defrosting method of an air conditioner according to claim 2, further comprising: and after the air conditioner compressor works for T5 time, judging the temperature T of the outdoor unit of the air conditioner, and if the T is less than a fourth preset temperature m4, controlling the outdoor unit to be opened for defrosting, wherein T3 is more than T4 and less than T5, and m4 is more than m 3.
4. The defrosting method of an air conditioner according to claim 1, further comprising: and after the compressor of the air conditioner works for T5 time, judging the temperature T of the outdoor unit of the air conditioner, and if the T is less than a fourth preset temperature m4, controlling the outdoor unit to be opened for defrosting, wherein T3 is less than T5, and m4 is less than m 2.
5. The defrosting method of an air conditioner according to claim 1, wherein the T0 is 10min, the T1 is 15min, and the T6 is 30 min.
6. The defrosting method of an air conditioner according to claim 1, further comprising: and judging the temperature T of the outdoor unit of the air conditioner, and controlling the outdoor unit to be started for defrosting when the T is less than a sixth preset temperature m6 for a duration time T11.
7. The defrosting method of an air conditioner according to claim 4, wherein m4 is-15 ℃.
8. An air conditioner, comprising: the refrigerator comprises an outdoor unit, a compressor, a defrosting part, a timing module, a control module and a temperature measuring module, wherein the compressor, the timing module, the temperature measuring module and the defrosting part are all connected with the control module, and the control module is suitable for starting the timing module while starting the compressor;
when the control module receives a timing signal fed back by the timing module and is between T0 and T1, the control module is suitable for recording the minimum tmin of the temperature T of the outdoor unit measured by the temperature measuring module;
when the control module receives a timing signal fed back by the timing module and is greater than or equal to T2, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a first preset temperature m1 and tmin-T is greater than or equal to a first preset temperature difference delta T1; the first preset temperature m1 is the frosting temperature of the air conditioner when the compressor of the air conditioner works for T2 time under the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold;
when the control module receives a timing signal fed back by the timing module and is greater than or equal to T3, the control module is suitable for starting the defrosting part to defrost when the T is judged to be less than a second preset temperature m2 and tmin-T is greater than or equal to a second preset temperature difference delta T2; the second preset temperature m2 is the frosting temperature of the air conditioner when the compressor of the air conditioner works for T3 time under the atmospheric pressure and the annual average relative humidity of the region where the air conditioner is sold;
the control module is suitable for closing the defrosting part to stop defrosting when the t is judged to be higher than a stop temperature m 0;
wherein T0 is more than T1 and more than T2 and more than T3, m2 is more than m1, and delta T2 is more than delta T1;
after the control module receives a timing signal fed back by the timing module and works for T6 time, the control module is suitable for judging outdoor temperature n and the temperature T of the outdoor unit of the air conditioner, and if the T is less than a fifth preset temperature m5 and 0.5 x n-T is greater than a third preset temperature difference delta T3, the outdoor unit is controlled to be started to defrost; the T1 < T6 < T2; the fifth preset temperature m5 is a frosting temperature of the air conditioner during the time T6 when the compressor is operated.
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