CN112032855A - Outdoor machine of air conditioner - Google Patents
Outdoor machine of air conditioner Download PDFInfo
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- CN112032855A CN112032855A CN202010911255.9A CN202010911255A CN112032855A CN 112032855 A CN112032855 A CN 112032855A CN 202010911255 A CN202010911255 A CN 202010911255A CN 112032855 A CN112032855 A CN 112032855A
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- power curve
- outdoor unit
- value
- defrosting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F2140/50—Load
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner outdoor unit, which comprises a casing; a heat exchanger; a fan; a control unit for acquiring and judging a defrosting main condition and a defrosting auxiliary condition; wherein the control unit is used for acquiring a reference power curve K of the fan0Value and real time power curve KnThe value is used as a defrosting auxiliary condition; the control unit is used for acquiring a reference power curve after the air conditioner outdoor unit is defrosted for the first time and calculating the reference power curve K0The value is obtained. The invention adopts the change trend of the fan power curveThe potential comparison judgment mode considers the problem of inconsistent power change sensitivity degrees before and after frosting of the heat exchanger under different rotating speeds of the fan; reference power curve K0The value is set to be acquired after the air conditioner outdoor unit is defrosted, so that a large error of subsequent frosting judgment caused by accumulated snow or partial frosting in the external environment of the air conditioner outdoor unit is avoided; on the other hand, for the reference power curve K0The value acquisition time is judged, and the effectiveness of the reference power curve is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner outdoor unit.
Background
Under the heating working condition of an air conditioner, the heating effect of an outdoor unit of the air conditioner is often influenced by the frosting of a heat exchanger, and the heat exchanger needs to be defrosted in order to eliminate the frosting on the heat exchanger.
In the prior art, the defrosting condition is basically determined by the temperature of the outdoor heat exchanger. However, the outdoor units of the same type are still different in defrosting temperature conditions due to different installation environments of the outdoor units, different refrigerant charge amounts, or large refrigerant charge amount deviation. This may cause that some outdoor heat exchangers are not frosted but meet the defrosting condition, and defrosting is performed; it also results that the heat exchanger has frosted but not defrosted. Performing wrong defrosting or not performing defrosting has a great influence on the heating effect and wastes electric energy.
Therefore, an air conditioner outdoor unit needs to be designed to have a function of assisting in judging defrosting, and the problem that defrosting is not accurate in the prior art is solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the air conditioner outdoor unit, which weakens the influence of the external environment on the defrosting precision, and can greatly improve the defrosting judgment precision of the air conditioner outdoor unit without adding other devices.
In order to achieve the purpose, the invention adopts the following technical scheme:
an outdoor unit of an air conditioner, comprising:
a housing;
the heat exchanger is arranged in the shell;
the fan is arranged in the shell and used for realizing the heat exchange between the heat exchanger and flowing air;
a control unit for acquiring and judging a defrosting main condition and a defrosting auxiliary condition;
wherein the control unit is used for acquiring the base of the fanQuasi power curve K0Value and real time power curve KnThe value is used as a defrosting auxiliary condition; the control unit is used for acquiring a reference power curve after the air conditioner outdoor unit is defrosted for the first time and calculating the reference power curve K0A value; wherein K0The value being the slope of the reference power curve, KnThe value is the slope of the real-time power curve.
In some embodiments of the present invention, the control unit is configured to determine whether the heating accumulated time T satisfies T after determining the defrosting main condition1<T<T2(ii) a If the heating accumulated time T satisfies T1<T<T2If the defrosting is not performed, the control unit judges the defrosting auxiliary condition; wherein T is1And T2The endpoint of the heating accumulation time range.
In some embodiments of the invention, the control unit is adapted to calculate a reference power curve K0Value and real time power curve KnThe difference value delta K of the values is judged, whether the delta K is larger than a standard value F is judged, and if the delta K is larger than the standard value F, the delta K is judged>And F, defrosting the air conditioner outdoor unit, otherwise, not defrosting the air conditioner outdoor unit.
In some embodiments of the present invention, the control unit is configured to obtain a reference power curve after defrosting the outdoor unit of the air conditioner and determine an obtaining time TnWhether or not greater than T3If T isn>T3Then the acquired reference power curve and the acquisition time T are usednRe-obtaining after zero clearing, otherwise, calculating the reference power curve K0A value; wherein T is3To obtain the time TnThe threshold value of (2).
In some embodiments of the present invention, the control unit is configured to obtain a detected power curve during an installation and debugging phase of the outdoor unit of the air conditioner, compare the detected power curve with a plurality of non-frosted initial power curves, and select a power curve N to calculate a standard value F, where the power curve N is any one of the plurality of non-frosted initial power curves.
In some embodiments of the invention, the control unit is configured to calculate a mean square error of the detected power curve and a number of non-frosted initial power curves.
In some embodiments of the present invention, the calculation formula of the standard value F is F = Δ k (N) + e, where Δ k (N) is a difference value between a slope of the power curve N and a slope of an initial frosting power curve in the same shielding state; and the correction value e is the mean square error of the power curve N and the detection power curve.
In some embodiments of the invention, the value of the correction value e is in the range of- Δ K (n)/5 ≦ e ≦ Δ K (n)/5.
In some embodiments of the present invention, the control unit is configured to store a difference between a slope of an initial power curve of the outdoor unit of the air conditioner and a slope of an initial power curve of frosting in a plurality of shielding states of an in-plant test stage.
In some embodiments of the invention, the control unit is configured to obtain the heat exchanger temperature and the ambient temperature as the defrosting main conditions.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
the method adopts a judgment mode of comparing the variation trends of the fan power curve, and considers the problem of inconsistent power variation sensitivity before and after frosting of the heat exchanger at different rotating speeds of the fan; reference power curve K0The value is set to be acquired after the air conditioner outdoor unit is defrosted, so that a large error of subsequent frosting judgment caused by accumulated snow or partial frosting in the external environment of the air conditioner outdoor unit is avoided; on the other hand, for the reference power curve K0And judging the value acquisition time, and if the acquisition time is too long, re-acquiring the reference power curve, so that the effectiveness of the reference power curve is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of an outdoor unit of an air conditioner according to the present invention.
Fig. 2 is a defrosting flowchart of an outdoor unit of an air conditioner according to the present invention.
Fig. 3 is a flow chart of the acquisition of the defrost assist condition of the present invention.
Fig. 4 is a flowchart of determining the defrosting assistance condition according to the present invention.
FIG. 5 is a comparison graph of power in different windscreens according to the present invention.
Reference numerals: 100-a housing; 200-a fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
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 two or more unless otherwise specified.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator in the present application. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
The present invention provides an embodiment of an outdoor unit of an air conditioner, as shown in fig. 1, including: a housing 100;
a heat exchanger (not shown) provided in the cabinet 100;
a fan 200 disposed in the casing 100 for realizing heat exchange between the heat exchanger and flowing air;
a control unit (not shown in the figure) for acquiring and judging a defrosting main condition and a defrosting auxiliary condition;
wherein the control unit is used for acquiring a reference power curve K of the fan0Value and real time power curve KnThe value is used as a defrosting auxiliary condition; the control unit is used for acquiring a reference power curve after the air conditioner outdoor unit is defrosted and calculating the reference power curve K0A value; wherein K0The value being the slope of the reference power curve, KnThe value is the slope of the real-time power curve.
In some embodiments of the present invention, the defrosting determination condition obtained from the temperature conditions such as the temperature of the heat exchanger and the ambient temperature is used as a main condition for defrosting determination with a high degree of accuracy. And a defrosting auxiliary condition is added on the basis of the main condition, so that the air conditioner is defrosted more accurately and the heating effect of the air conditioner is ensured. The defrosting auxiliary condition is that according to the prediction of the power of the fan, when the heat exchanger frosts, gaps of fins of the heat exchanger are reduced, so that the air intake is reduced; for the fan, the air volume is reduced under the same rotating speed, the work of the fan is reduced, the power is reduced, compared with an outdoor unit without frost, the power curve is necessarily a trend of reduction, when the heat exchanger is completely blocked by frost, the air volume delivered by the fan is extremely small, the work is very small, the power is obviously reduced, and therefore the frost condition of the outdoor unit can be judged through the change of the power of the fan.
In some embodiments of the present invention, reference is made to fig. 2, and fig. 2 is a flow chart of the control unit implementing the defrosting control. And in the heating operation process, whether the air conditioner outdoor unit meets the main defrosting condition or not is judged in real time, namely whether the temperature of the heat exchanger and the ambient temperature meet the defrosting standard or not is judged. Judging whether the heating accumulated time T meets T or not after judging the defrosting main condition1<T<T2。
Specifically, when the air-drying outdoor unit meets the defrosting main condition, whether the heating time T is less than T or not is judged1If T is<T1If not, the control unit controls the air conditioner outdoor unit to defrost. When the outdoor unit of the air conditioner does not meet the defrosting main condition, judging whether the heating time T is more than T or not2If T is>T2If not, the control unit controls the air conditioner outdoor unit to defrost. Wherein T is1And T2For the end of the heating accumulation time range, T1For the condition of too short defrosting interval time, when the heating time is less than T1That is, when it is determined that defrosting is necessary by the defrosting main condition, there is a possibility that defrosting is erroneously performed, and therefore, the determination is further performed by the defrosting auxiliary condition. T is2For defrosting time interval condition, when heating time exceeds T2That is, when it is determined that defrosting is not necessary by the defrosting main condition, there is also a possibility of erroneous defrosting, and the determination is further made by the defrosting auxiliary condition.
In some embodiments of the present invention, referring to fig. 3, for the process of obtaining the defrosting auxiliary condition, since the calculation of the power curve requires a pre-and-post comparison, a reference value needs to be obtained, and the reference value is the power curve when the heat exchanger is not frosted, i.e. the reference power curve.
When the air conditioner is started for heating for the first time, because the air conditioner is in winter, accumulated snow or partial frost may exist in the heat exchanger, and the calculation of the reference value can generate a large error when the judgment is carried out again after the subsequent defrosting; therefore, the reference power curve is obtained after the first defrosting through the main judgment condition. That is, the flow chart of fig. 3 is entered to obtain the reference power curve after the first defrosting. The reference power curve is obtained in two cases:
firstly, after the first defrosting, the power under different wind gears is directly collected, so that a reference power curve is formed and is used for judging defrosting auxiliary conditions.
Second, in the process of heating operationContinuing with fig. 3, after the heating is started, the reference power curve and the acquisition time T are cleared firstnThen, whether the reference power curve is acquired or not is judged in real time, and if the reference power curve is acquired, the acquisition time T is judgednWhether or not greater than T3When T isn<T3If so, judging the next defrosting auxiliary condition by adopting the reference power curve; when T isn>T3Then, the reference power curve and the acquisition time T are clearednAnd then continuously acquiring a reference power curve. The fan power is relatively large relative to the environment, and the environment can be changed when the fan runs for a long time, so that the power curve acquisition time exceeds T3Then reacquiring is performed to ensure the validity of the reference power curve.
In the heating operation process, if the reference power curve is not obtained, whether defrosting is finished or not is judged, namely after the defrosting is finished, the control unit adjusts different wind gears, such as a wind gear A and a wind gear B, and power drawing power curves under the two wind gears are obtained.
Referring to FIG. 3, K at which the reference power curve has been obtained0And then judging whether the heating operation is continued or not, if the heating operation is continued, continuously judging to acquire the time TnWhether or not greater than T3。
Regarding the power under different wind gears, because the installation environments of the outdoor units of the air conditioners are different, the power of the fans of the same outdoor unit is different under different environments and the same wind speed. Along with the service life lengthening, the dirty stifled condition of heat exchanger also can influence the power of outdoor unit fan. Therefore, the power comparison under a single rotating speed is not carried out when the power of the external fan is predicted. In the laboratory stage, the heat exchanger is plugged in different degrees in the same environment, and the power comparison conditions of the heat exchanger at different rotating speeds can be obtained through tests, wherein the power comparison conditions are shown in fig. 5. The dotted line of the series 1 represents the relationship between the power and the rotating speed of the heat exchanger with weak plugging degree, and the solid line of the series 2 represents the relationship between the power and the rotating speed of the heat exchanger with strong plugging degree. The comparison shows that when the rotating speed is low, the influence on the power is weak; at higher speeds, the power gap begins to grow.
Therefore, in order to obtain a more accurate reference power curve to determine the defrosting auxiliary condition, a slightly lower rotating speed is set as the A gear, as shown in the left vertical line in FIG. 5; a higher rotation speed is taken as the B gear, as shown by the right vertical line in FIG. 5. Through the two points, a rough increasing trend of a power curve can be obtained and used as a basis for further judging power increase and decrease.
In some embodiments of the present invention, the determination of defrost assist conditions, i.e., the comparison of power curves, is described with reference to FIG. 4. Firstly, defining the increasing slope of the power curve as K value, K = (P)A-PB)/(VA-VB) Wherein V isAAnd VBThe rotating speeds of the wind gear A and the wind gear B are respectively PAAnd PBAre each VAAnd VBOf the power of (c).
The control unit is used for calculating a reference power curve K0Value and real time power curve KnThe difference value delta K of the values is judged, whether the delta K is larger than a standard value F is judged, and if the delta K is larger than the standard value F, the delta K is judged>And F, defrosting the air conditioner outdoor unit, otherwise, not defrosting the air conditioner outdoor unit. Reference power curve K0The values are obtained from the flow chart shown in fig. 3, and the control unit obtains K of the real-time power curve when an auxiliary defrost decision needs to be madenThe value is obtained.
In some embodiments of the present invention, for the setting of the standard value F, the control unit is configured to obtain a detection power curve at an installation and debugging stage of the outdoor unit of the air conditioner, compare the detection power curve with a plurality of non-frosted initial power curves, and select a power curve N to calculate the standard value F. Specifically, due to different installation environments, in order to avoid the influence of environmental factors on the power of the fan, the standard value F is determined at the debugging stage of the installation completion. The determination method comprises the following steps:
the method comprises the steps of obtaining initial power curves of M (3 < M < 10) heat exchangers of a certain outdoor unit in different shielding degrees at an in-plant test stage, and selecting initial power under different wind gears to form the initial power curves under the same shielding degree.
Under different shielding conditions, calculating delta K for the initial power curve with frosting and non-frosting; and pre-storing the non-frosted initial power curve and the corresponding delta K into the control unit as the setting basis of the standard value F.
The air conditioner outdoor unit is debugged and operated after being installed, and a detection power curve at the moment is obtained at the operation stage; the standard value F is obtained by comparing the detected power curve with the initial power curve in the control unit.
The specific comparison method comprises the following steps: selecting more than 4 fan gears from low to high to obtain a detection power curve consisting of the power of each wind gear, calculating the mathematical mean square error E of the detection power curve corresponding to the power of the same gear under different shielding degrees, and taking the initial power curve with the minimum mean square error as the most similar power curve N. And correcting the delta K corresponding to the power curve N to a certain degree and using the corrected delta K as a standard value F.
In some embodiments of the present invention, the calculation formula of the standard value F is F = Δ k (N) + e, where Δ k (N) is a difference value between a slope of the power curve N and a slope of an initial frosting power curve in the same shielding state; and the correction value e is the mean square error of the power curve N and the detection power curve. In order to prevent the correction value e from being too large, the value range is set to be-delta K (n)/5, e and delta K (n)/5.
Referring to fig. 2, after defrosting according to the defrosting auxiliary condition, it is continuously determined whether the defrosting auxiliary condition is obtained, if so, the control unit performs heating operation, otherwise, the control unit continuously obtains a fan power curve, and further calculates the defrosting auxiliary condition.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An outdoor unit of an air conditioner, comprising:
a housing;
the heat exchanger is arranged in the shell;
the fan is arranged in the shell and used for realizing the heat exchange between the heat exchanger and flowing air;
a control unit for acquiring and judging a defrosting main condition and a defrosting auxiliary condition;
wherein the control unit is used for acquiring a reference power curve K of the fan0Value and real time power curve KnThe value is used as a defrosting auxiliary condition; the control unit is used for acquiring a reference power curve after the air conditioner outdoor unit is defrosted for the first time and calculating the reference power curve K0A value; wherein K0The value being the slope of the reference power curve, KnThe value is the slope of the real-time power curve.
2. The outdoor unit of claim 1, wherein the control unit is configured to determine whether the heating accumulated time T satisfies T after determining the defrosting main condition1<T<T2(ii) a If the heating accumulated time T satisfies T1<T<T2If the defrosting is not performed, the control unit judges the defrosting auxiliary condition; wherein T is1And T2The endpoint of the heating accumulation time range.
3. The outdoor unit of claim 1, wherein the control unit is configured to calculate a reference power curve K0Value and real time power curve KnThe difference value delta K of the values is judged, whether the delta K is larger than a standard value F is judged, and if the delta K is larger than the standard value F, the delta K is judged>And F, defrosting the air conditioner outdoor unit, otherwise, not defrosting the air conditioner outdoor unit.
4. The outdoor unit of claim 1, wherein the control unit is configured to obtain a reference power curve and determine a obtaining time T after defrosting the outdoor unitnWhether or not greater than T3If T isn>T3Then the acquired reference power curve and the acquisition time T are usednRe-obtaining after zero clearing, otherwise, calculating the reference power curve K0A value; wherein T is3To obtain the time TnThe threshold value of (2).
5. The outdoor unit of claim 3, wherein the control unit is configured to obtain a detected power curve during an installation and commissioning phase of the outdoor unit, compare the detected power curve with a plurality of non-frosted initial power curves, and select a power curve N to calculate a standard value F, wherein the power curve N is any one of the plurality of non-frosted initial power curves.
6. The outdoor unit of claim 5, wherein the control unit is configured to calculate a mean square error between the detected power curve and a plurality of non-frosted initial power curves.
7. The outdoor unit of claim 5, wherein the standard value F is calculated as F = Δ k (N) + e, where Δ k (N) is a difference between a slope of the power curve N and a slope of an initial frosting power curve in the same shielding state; and the correction value e is the mean square error of the power curve N and the detection power curve.
8. The outdoor unit of claim 7, wherein the correction value e has a value ranging from- Δ k (n)/5 ≤ e ≤ Δ k (n)/5.
9. The outdoor unit of claim 1, wherein the control unit is configured to store a difference between a slope of an unfrozen initial power curve and a slope of a frosted initial power curve of the outdoor unit in a plurality of shielding states of an in-plant test stage.
10. The outdoor unit of claim 1, wherein the control unit is configured to obtain the heat exchanger temperature and the ambient temperature as defrosting main conditions.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883658A (en) * | 2021-10-22 | 2022-01-04 | 青岛海信日立空调系统有限公司 | Method for judging whether air conditioner is dirty or blocked, air conditioner and cloud platform |
| CN114992824A (en) * | 2022-06-28 | 2022-09-02 | 宁波奥克斯电气股份有限公司 | Control method and control device of air conditioner and air conditioner |
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| CN112032855B (en) | 2022-01-18 |
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