CN110470003B - Control method and device for defrosting of air conditioner and air conditioner - Google Patents
Control method and device for defrosting of air conditioner and air conditioner Download PDFInfo
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- CN110470003B CN110470003B CN201910712374.9A CN201910712374A CN110470003B CN 110470003 B CN110470003 B CN 110470003B CN 201910712374 A CN201910712374 A CN 201910712374A CN 110470003 B CN110470003 B CN 110470003B
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- temperature
- air conditioner
- defrosting
- heat exchanger
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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
- F24F11/62—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- 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
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: controlling the compressor of the air conditioner to perform frequency reduction operation under the condition that the air conditioner needs to be defrosted; obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger; and under the condition that the temperature of the outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to stop carrying out frequency reduction operation on the compressor. The time for the air conditioner to quit defrosting is comprehensively judged by utilizing a plurality of temperature parameters of the outdoor heat exchanger, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved; and the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and the frosting condition of the outdoor heat exchanger is improved, so that the adverse effect of frost condensation on the heating performance of the air conditioner is reduced. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.
Description
Technical Field
The application relates to the technical field of air conditioner defrosting, in particular to a control method and device for air conditioner defrosting and an air conditioner.
Background
At present, most of main flow machine types of air conditioners have a heat exchange function of a refrigerating and heating double mode, and users generally adjust the air conditioners to a heating mode to utilize the air conditioners to increase the temperature of indoor environment in low-temperature areas or under the weather conditions with large wind and snow; in the operation and heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit plays a role of an evaporator absorbing heat from the outdoor environment, and is affected by the temperature and the humidity of the outdoor environment, more frost is easily condensed on the outdoor heat exchanger, and the heating capacity of the air conditioner is lower and lower when the frost is condensed to a certain thickness, so that the outdoor heat exchanger needs to be defrosted in order to ensure the heating effect and avoid excessive frost condensation.
Here, the defrosting of the outdoor heat exchanger is mainly performed in the following ways: firstly, reverse cycle defrosting is carried out, when the air conditioner carries out reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; secondly, an electric heating device is added on a refrigerant pipeline of the air conditioner, the electric heating device is used for heating the refrigerant flowing into the outdoor heat exchanger, and then the heat of the refrigerant is used for melting the frost condensed on the outdoor heat exchanger; and thirdly, adjusting the operation parameters of the air-conditioning components such as the compressor, the electronic expansion valve and the like to change the temperature and the pressure state of the refrigerant in the refrigerant pipeline, so that the refrigerant pipeline can also have the function of defrosting the outdoor heat exchanger.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
because the defrosting modes of the outdoor heat exchanger have influence on the normal heating performance of the air conditioner more or less, the air conditioner can judge before quitting defrosting, and then the air conditioner is controlled to quit defrosting according to the judgment result. In the related art, whether to quit defrosting is generally judged by comparing the outdoor environment temperature with the frost point temperature. Because the frost condition of the outdoor heat exchanger can be influenced by various factors such as the outdoor environment, the running state of the outdoor heat exchanger and the like, the judgment mode of whether to quit the defrosting mode is too rough, the air conditioner is easy to quit the defrosting mode in advance to cause incomplete defrosting, or the defrosting mode is continuously run after defrosting is finished to influence the normal heating performance of the air conditioner.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for defrosting of an air conditioner and the air conditioner, and aims to solve the technical problems that in the related art, the judgment mode of whether to exit a defrosting mode is too rough, the air conditioner is easy to exit the defrosting mode in advance, so that defrosting is not thorough, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is finished.
In some embodiments, the control method for defrosting an air conditioner includes:
controlling the compressor of the air conditioner to perform frequency reduction operation under the condition that the air conditioner needs to defrost;
obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger;
and under the condition that the temperature of the outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to stop carrying out frequency reduction operation on the compressor.
In some embodiments, the control device for air conditioner defrosting includes a processor and a memory storing program instructions, and the processor is configured to execute the control method for air conditioner defrosting when executing the program instructions.
In some embodiments, the air conditioner includes:
the refrigerant circulation loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the control device for defrosting of the air conditioner is electrically connected with the compressor.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:
in the defrosting operation process of the air conditioner, the time for the air conditioner to quit defrosting is comprehensively judged by utilizing three parameters, namely the temperature of an outdoor coil pipe of an outdoor heat exchanger, the temperature of a coolant outlet liquid and the temperature of an upper shell, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved, the condition that the air conditioner quits a defrosting mode in advance to cause incomplete defrosting is avoided, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is finished is avoided; and the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, so that the adverse effects of temperature factors such as too low temperature of the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are reduced, the frosting condition of the outdoor heat exchanger is improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart diagram of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart diagram of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
Fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the disclosure provides a control method for defrosting an air conditioner, as shown in fig. 1, including the following steps:
s101: and controlling the compressor of the air conditioner to perform frequency reduction operation under the condition that the air conditioner needs to perform defrosting.
In an embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a severe working condition with low temperature and high humidity, and at this time, a user generally sets the air conditioner to operate in a heating mode so as to heat and raise the temperature of the indoor environment by using the air conditioner. Therefore, the control method for defrosting the air conditioner provided by the embodiment of the disclosure is a control flow which is started when the air conditioner operates in a heating mode.
Optionally, whether the air conditioner needs defrosting is judged by comparing the outdoor environment temperature with the frost point temperature. When the outdoor environment temperature is lower than the frost point temperature, the air conditioner is considered to need defrosting; when the outdoor ambient temperature is higher than the frost point temperature, the air conditioner is considered to be not required to defrost.
The heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and the adverse effects of temperature factors such as too low temperature of the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are further reduced, so that the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
S102: and obtaining the temperature of an outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell of the outdoor heat exchanger.
Optionally, a first temperature sensor is disposed at a coil position of an outdoor heat exchanger of the outdoor unit of the air conditioner, and the first temperature sensor may be configured to detect a real-time temperature of the coil position. Thus, the outdoor coil temperature acquired in step S102 may be the real-time temperature of the coil position detected by the first temperature sensor.
The temperature change of the coil pipe position of the outdoor heat exchanger can visually reflect the temperature change condition of the refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor environment temperature and the internal refrigerant temperature, and in addition, the temperature change condition is generally a pipeline part of the outdoor heat exchanger, which is easy to cause the frosting problem. Therefore, the acquired temperature of the outdoor coil can be used as a reference factor for measuring the frosting influence of the inside and the outside of the air conditioner on the outdoor heat exchanger.
Optionally, a second temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the second temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger. Therefore, the refrigerant outlet temperature of the outdoor heat exchanger obtained in step S102 may be the real-time temperature of the refrigerant detected by the second temperature sensor. Here, the refrigerant outflow line is a line through which the refrigerant flows out of the outdoor heat exchanger when the air conditioner operates in the heating mode.
The temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency of the outdoor heat exchanger and the outdoor environment, and the heat exchange efficiency is influenced by the frosting degree of the outdoor heat exchanger; here, when the frost formation degree of the air conditioner is low and the thickness of the frost is thin, the influence of the frost on heat exchange is small, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is large; under the conditions of high frosting degree and thick frost thickness of the air conditioner, the influence of the frost on heat exchange is large, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is small. Therefore, the obtained refrigerant outlet liquid temperature can be used as a reference factor for measuring the frosting degree of the air-conditioning heat exchanger.
Optionally, a third temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the third temperature sensor can be used for detecting the upper shell temperature of the outdoor heat exchanger. Therefore, the upper case temperature acquired in step S102 may be the real-time temperature detected by the third temperature sensor.
The refrigerant inlet pipeline of the outdoor heat exchanger is arranged at the lower part, and the refrigerant outlet pipeline of the outdoor heat exchanger is arranged at the upper part, so that the refrigerant flows into the outdoor heat exchanger from the lower part and flows out of the outdoor heat exchanger from the upper part in the heating mode. Therefore, the temperature of the upper shell is influenced by the temperature of the refrigerant which flows through most pipelines of the outdoor heat exchanger and exchanges heat with the outdoor environment, and the heat exchange efficiency of the refrigerant under different frosting conditions can be reflected. Under the condition that the air conditioner is not frosted, the refrigerant absorbs more heat from the outdoor environment, so the temperature of the upper shell influenced by the refrigerant is higher; in the case of frost formation in the air conditioner, the refrigerant absorbs less heat from the outdoor environment, and therefore the upper casing temperature is also lower. Therefore, compared with the temperature of the outdoor coil pipe at the lower part of the outdoor heat exchanger, the temperature of the upper shell of the outdoor heat exchanger can more accurately reflect the frosting degree of the outdoor heat exchanger.
S103: and under the condition that the temperature of the outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to stop carrying out frequency reduction operation on the compressor.
Under the condition that the temperature of an outdoor coil of the outdoor heat exchanger, the temperature of a refrigerant outlet liquid and the temperature of an upper shell meet defrosting exit conditions, the running state of a compressor of the air conditioner is controlled to be stopped and adjusted, and the influence of the frequency reduction operation of the compressor on the normal heating performance of the air conditioner is reduced.
Optionally, the defrost exit condition is:
T 1 ≥T 01 ，t 1 ≥t 01 ，T 2 ≥T 02 ，t 2 ≥t 02 ，T 3 ≥T 03 and t is 3 ≥t 03
Wherein, T 1 Is the outdoor coil temperature, T, of the outdoor heat exchanger 01 Is a first predetermined temperature, t 1 Is T 1 ≥T 01 Duration of (d), t 01 Is a first preset duration, T 2 The temperature T of the refrigerant outlet liquid of the outdoor heat exchanger 02 Is a second predetermined temperature, t 2 Is T 2 ≥T 02 Duration of (d), t 02 For a second predetermined duration, T 3 Upper shell temperature, T, of outdoor heat exchanger 03 Is a third predetermined temperature, t 3 Is T 3 ≥T 03 Duration of (d), t 03 A third preset duration.
Optionally, the first preset temperature is a pre-stored corrected temperature of the outdoor coil after defrosting of the outdoor heat exchanger is completed, which is detected in the air conditioner defrosting test process. After the outdoor heat exchanger finishes defrosting, the temperature of an outdoor coil pipe of the outdoor heat exchanger fluctuates to a certain extent due to reasons such as frost water evaporation and the like. Therefore, the temperature of the outdoor coil pipe detected in the defrosting test process of the air conditioner after the defrosting of the outdoor heat exchanger is finished is corrected, and the accuracy of defrosting exit conditions is improved.
The first preset temperature can be calculated by the following formula:
T 01 ＝α*T 001
wherein alpha is a first scale factor, T 001 The temperature of the outdoor coil after the defrosting of the outdoor heat exchanger is finished is detected in the defrosting test process of the air conditioner. Alpha has a value range of [1.1, 1.3 ]]E.g. 1.1, 1.15, 1.2, 1.25, 1.3.
Optionally, the second preset temperature is a pre-stored correction temperature of the refrigerant outlet liquid temperature after the defrosting of the outdoor heat exchanger is completed, which is detected in the air conditioner defrosting test process. After defrosting of the outdoor heat exchanger is completed, heat exchange efficiency between the outdoor heat exchanger and an outdoor environment is affected due to reasons such as evaporation of frost condensed on the outdoor heat exchanger, and therefore deviation occurs between detected refrigerant liquid outlet temperature and refrigerant liquid outlet temperature when the outdoor heat exchanger stably operates after actual defrosting is completed. Therefore, the refrigerant outlet liquid temperature after the defrosting of the outdoor heat exchanger is finished, which is detected in the air conditioner defrosting test process, is corrected, and the accuracy of the defrosting exit condition is improved.
The second preset temperature can be calculated by the following formula:
T 02 ＝β*T 002
wherein beta is a second proportionality coefficient, T 002 The temperature of the refrigerant discharged from the outdoor heat exchanger after defrosting is detected in the defrosting test process of the air conditioner. The value range of beta is [1.1, 1.4 ]]E.g. 1.1, 1.2, 1.3, 1.4.
Optionally, the third preset temperature is a pre-stored corrected temperature of the upper shell temperature after the defrosting of the outdoor heat exchanger detected in the air conditioner defrosting test process is completed. After the outdoor heat exchanger finishes defrosting, the temperature of the upper shell of the outdoor heat exchanger fluctuates to a certain extent due to reasons such as frost water evaporation and the like. Therefore, the temperature of the upper shell after the defrosting of the outdoor heat exchanger is finished, which is detected in the process of testing the defrosting of the air conditioner, is corrected, and the accuracy of the defrosting exit condition is improved.
The third predetermined temperature can be calculated by the following formula:
T 03 ＝δ*T 003
where, δ is the third proportionality coefficient, T 003 The upper shell temperature after the defrosting of the outdoor heat exchanger is finished is detected in the air conditioner defrosting test process. Delta is in the range of [1.1, 1.3 ]]E.g. 1.1, 1.15, 1.2, 1.25, 1.3.
Optionally, the first preset duration is in a value range of [2s, 5s ] (s: s), for example, 2s, 3s, 4s, 5 s; the value range of the second preset time length is [2s, 5s ], for example, 2s, 3s, 4s, 5 s; the third preset time period has a value range of [2s, 5s ], for example, 2s, 3s, 4s, 5 s.
In the defrosting exit condition, the temperature of the outdoor coil of the outdoor heat exchanger is greater than a first preset temperature, and the duration is greater than a first preset duration, so that the defrosting completion of the outer surface of the outdoor heat exchanger can be visually reflected; the refrigerant outlet temperature of the outdoor heat exchanger is greater than a second preset temperature, and the duration time is greater than the second preset time, so that the condition that the heating performance of the outdoor heat exchanger recovers at least frost or no frost can be reflected; the temperature of the upper shell of the outdoor heat exchanger is higher than the third preset temperature, and the duration is longer than the third preset duration, so that the defrosting completion of the outer surface of the outdoor heat exchanger can be accurately reflected. Therefore, the compressor can be stopped from being down-converted, and the defrosting operation mode of the air conditioner can be exited.
In the embodiment, in the defrosting operation process of the air conditioner, the time for stopping heating and quitting defrosting of the air conditioner is comprehensively judged by using the three parameters of the outdoor coil temperature, the refrigerant outlet temperature and the upper shell temperature of the outdoor heat exchanger, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved, incomplete defrosting caused by the fact that the air conditioner quits the defrosting mode in advance is avoided, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is completed. In addition, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and the adverse effects of temperature factors such as too low temperature of the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are further reduced, so that the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
Fig. 2 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 2, including the following steps:
s201: and judging whether the air conditioner needs to be defrosted or not.
S202: under the condition that the air conditioner needs defrosting, a first temperature difference value between the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature recorded after the air conditioner is started and operated at this time is obtained.
The maximum value of the upper shell temperature of the outdoor heat exchanger and the second temperature difference value of the upper shell temperature of the outdoor heat exchanger, which are recorded after the air conditioner is started to operate, can reflect the heat absorption efficiency of refrigerants in the outdoor heat exchanger under different frosting conditions, and therefore the maximum value of the upper shell temperature of the outdoor heat exchanger and the second temperature difference value can be used as parameters for judging the frosting degree of the air conditioner.
S203: and judging whether the first temperature difference value is larger than a first preset temperature difference threshold value or not.
The first temperature difference value is larger than a first preset temperature difference threshold value, which indicates that the air conditioner is influenced by frosting of an outdoor heat exchanger of the air conditioner, and the heating capacity is reduced. Therefore, the frequency reduction operation of the compressor is controlled, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced, and the frosting condition of the outdoor heat exchanger is improved.
S204: and under the condition that the first temperature difference value is greater than a first preset temperature difference threshold value, acquiring a first target frequency reduction value according to the first temperature difference value.
If the first temperature difference is larger, the heating capacity of the air conditioner is poorer, the frosting degree of the outdoor heat exchanger of the air conditioner is more serious, and at the moment, the set frequency reduction value of the compressor is larger, so that the defrosting is accelerated; the first temperature difference is smaller, which indicates that the heating capacity is better, the frosting degree of the outdoor heat exchanger of the air conditioner is lighter, the frequency reduction value of the compressor can be properly reduced, and the influence of the frequency reduction of the compressor on the normal heating performance of the air conditioner is reduced. Accordingly, a first target down frequency of the compressor may be determined according to the first temperature difference value.
Optionally, according to the first temperature difference, a corresponding first down-conversion value is obtained from the first association relationship, and the first down-conversion value is used as a first target down-conversion value.
The first association relationship includes a corresponding relationship between one or more first temperature differences and the first down conversion value. For example, an optional first temperature difference versus first downconversion value is shown in Table 1 (where Δ T 1 ＝T 3max -T 03 ，ΔT 1 Is a first temperature difference, T 3max The maximum value of the upper shell temperature of the outdoor heat exchanger recorded after the air conditioner is started up and operated at this time):
table 1: first association relation
| First temperature difference (Unit:. degree. C.) | First frequency reduction value (Unit: Hz) |
| a 11 ＜ΔT 1 ≤a 12 | Δh 11 |
| a 12 ＜ΔT 1 ≤a 13 | Δh 12 |
| a 13 ＜ΔT 1 | Δh 13 |
In the first correlation, the first down-conversion value is positively correlated with the first temperature difference. Namely, the larger the first temperature difference is, the larger the first frequency reduction value is; the smaller the first temperature difference, the smaller the first down frequency.
S205: and controlling the compressor to carry out frequency reduction operation according to the first target frequency reduction value based on the current running frequency of the compressor.
S206: and obtaining the temperature of an outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell of the outdoor heat exchanger.
S207: and judging whether the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet defrosting exit conditions or not.
S208: and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to stop performing frequency reduction operation on the compressor.
In this embodiment, the normal heating performance of the air conditioner may be affected by improving the defrosting effect by adjusting the operating frequency of the compressor of the air conditioner. Therefore, under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, the operation frequency of the compressor of the air conditioner is controlled to stop adjusting and is recovered to the operation frequency of the normal heating mode, and the normal heating performance of the air conditioner is recovered.
Fig. 3 is a flowchart illustrating a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 3, including the following steps:
s301: and judging whether the air conditioner needs to be defrosted or not.
S302: and obtaining a second temperature difference value between the temperature of the outdoor coil of the air conditioner and the temperature of the outdoor environment under the condition that the air conditioner needs defrosting.
Optionally, the outdoor unit of the air conditioner is provided with a fourth temperature sensor, and the fourth temperature sensor can be used for detecting the outdoor environment temperature. Therefore, the outdoor ambient temperature acquired in step S302 may be the real-time temperature detected by the fourth temperature sensor.
S303: and judging whether the second temperature difference value is smaller than a second preset temperature difference threshold value.
Optionally, the second predetermined temperature difference threshold has a value in a range of [15 ℃, 25 ℃ (DEG C.: DEG C.), for example, 15 ℃, 20 ℃, 25 ℃.
And a second temperature difference value between the temperature of the outdoor coil and the outdoor environment temperature is smaller than a second preset temperature difference threshold value, which indicates that the air conditioner is influenced by frosting of an outdoor heat exchanger of the air conditioner, and the heating capacity is reduced. Therefore, the frequency reduction operation of the compressor is controlled, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced, and the frosting condition of the outdoor heat exchanger is improved.
S304: and under the condition that the second temperature difference value is smaller than a second preset temperature difference threshold value, acquiring a second target frequency reduction value according to the second temperature difference value.
If the second temperature difference is smaller, the heating capacity of the air conditioner is poorer, the frosting degree of the outdoor heat exchanger of the air conditioner is more serious, and at the moment, the set frequency reduction value of the compressor is larger, so that the defrosting is accelerated; if the second temperature difference is larger, the heating capacity is better, the frosting degree of the outdoor heat exchanger of the air conditioner is lighter, the frequency reduction value of the compressor can be properly reduced, and the influence of the frequency reduction of the compressor on the normal heating performance of the air conditioner is reduced. Accordingly, a second target down-conversion value of the compressor may be determined according to the second temperature difference value.
Optionally, according to the second temperature difference, a corresponding second down-conversion value is obtained from the second association relationship, and the second down-conversion value is used as a second target down-conversion value.
The second correlation includes one or more corresponding relationships between the second temperature difference and the second down-conversion value. For example, an optional second temperature difference versus second downconverter value is shown in Table 2 (where Δ T is 2 ＝T 1 -T 4 ，ΔT 1 Is a second temperature difference, T 4 Outdoor ambient temperature):
table 2: second incidence relation
| Second temperature difference (Unit:. degree. C.) | Second frequency reduction value (Unit: Hz) |
| a 21 ＜ΔT 2 ≤a 22 | Δh 21 |
| a 22 ＜ΔT 2 ≤a 23 | Δh 22 |
| a 23 ＜ΔT 2 | Δh 23 |
In the second correlation, the second frequency reduction value and the second temperature difference value are in negative correlation. Namely, the larger the second temperature difference is, the smaller the second frequency reduction value is; and the smaller the second temperature difference is, the larger the second down conversion value is.
S305: and controlling the compressor to carry out frequency reduction operation according to a second target frequency reduction value based on the current running frequency of the compressor.
And after the second target frequency reduction value is obtained, controlling the frequency reduction operation of the compressor according to the second target frequency reduction value based on the current operating frequency of the compressor, and improving the frosting condition of the outdoor heat exchanger.
S306: and obtaining the temperature of an outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell of the outdoor heat exchanger.
S307: and judging whether the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet defrosting exit conditions or not.
S308: and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to stop performing frequency reduction operation on the compressor.
In this embodiment, the normal heating performance of the air conditioner may be affected by improving the defrosting effect by adjusting the operating frequency of the compressor of the air conditioner. Therefore, under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, the operation frequency of the compressor of the air conditioner is controlled to stop adjusting and is recovered to the operation frequency of the normal heating mode, and the normal heating performance of the air conditioner is recovered.
In the above embodiment, since the degree of frosting of the outdoor heat exchanger has different influences on the thermal performance of the air conditioner, and further has different influences on the temperature change of the first temperature difference and the second temperature difference, the air conditioner is respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships to determine the corresponding frequency reduction value according to actual needs.
Optionally, the specifically selected association relationship may also be determined according to the heating demand of the current user, for example, when the heating demand of the current user is low, the second association relationship is selected, and at this time, the influence of frosting of the outdoor heat exchanger on the temperature of the outdoor coil is mainly considered; and when the heating demand of the current user is higher, the first incidence relation is selected, and at the moment, the influence of frosting of the outdoor heat exchanger on the temperature of the shell on the upper part of the outdoor heat exchanger is mainly considered.
The correlation ratio of the first correlation is larger than the correlation ratio in the second correlation. That is, under the condition of the temperature difference with the same value, the corresponding first frequency reduction value in the first association relationship is greater than the corresponding second frequency reduction value in the second association relationship.
Here, the heating demand of the current user may be determined by setting a target heating temperature for the air conditioner. For example, a heating temperature threshold is preset in the air conditioner, and when the target heating temperature actually set by the user is smaller than the heating temperature threshold, it indicates that the heating demand of the user is low at this time; and when the target heating temperature actually set by the user is greater than or equal to the heating temperature threshold, the heating requirement of the user is high or low at the moment.
In the embodiment of the disclosure, the defrosting operation of the air conditioner to the outdoor heat exchanger can be timely triggered according to the actual frosting condition of the air conditioner, and meanwhile, the heating requirement of a user can be considered when the defrosting operation of the compressor frequency reduction operation is executed, so that the control requirement of the air conditioner on the comfort level of the user in the defrosting process is fully ensured.
Fig. 4 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting of an air conditioner, which is structurally shown in fig. 4 and includes:
a processor (processor)40 and a memory (memory)41, and may further include a Communication Interface (Communication Interface)42 and a bus 43. The processor 40, the communication interface 42 and the memory 41 can communicate with each other through the bus 43. Communication interface 42 may be used for information transfer. The processor 40 may call logic instructions in the memory 41 to perform the control method for air conditioner defrosting of the above-described embodiment.
In addition, the logic instructions in the memory 41 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 41 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 40 executes functional applications and data processing by executing program instructions/modules stored in the memory 41, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 41 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 41 may include a high-speed random access memory, and may also include a nonvolatile memory.
An embodiment of the present disclosure provides an air conditioner, including:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the control device for defrosting of the air conditioner is electrically connected with the compressor.
According to the air conditioner provided by the embodiment of the disclosure, the time for the air conditioner to quit defrosting is comprehensively judged by using the three parameters of the outdoor coil temperature, the refrigerant outlet temperature and the upper shell temperature of the outdoor heat exchanger, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved; and the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, so that the adverse effects of temperature factors such as too low temperature of the outer surface of the outdoor heat exchanger and the like caused by large heat absorption are reduced, and the frosting condition of the outdoor heat exchanger is improved.
The embodiment of the disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the control method for defrosting an air conditioner.
An embodiment of the present disclosure provides a computer program product including a computer program stored on a computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to execute the above control method for defrosting an air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes, and may also be a transient storage medium.
The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (5)
1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
controlling a compressor of an air conditioner to perform frequency reduction operation under the condition that the air conditioner needs defrosting;
obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger;
under the condition that the temperature of the outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet defrosting exit conditions, controlling to stop carrying out frequency reduction operation on the compressor;
the defrosting exit condition is as follows:
T 1 ≥T 01 ，t 1 ≥t 01 ，T 2 ≥T 02 ，t 2 ≥t 02 ，T 3 ≥T 03 and is andt 3 ≥t 03
wherein the content of the first and second substances,T 1 is the outdoor coil temperature of the outdoor heat exchanger,T 01 is a first preset temperature, and is a second preset temperature,t 1 is composed ofT 1 ≥T 01 The duration of the time period of (c) is,t 01 is a first preset time period and is used for setting the time period,T 2 the temperature of the refrigerant outlet liquid of the outdoor heat exchanger,T 02 is the second preset temperature, and is the first preset temperature,t 2 is composed ofT 2 ≥T 02 The duration of the time period of (c) is,t 02 is a second preset time period for which,T 3 is the upper shell temperature of the outdoor heat exchanger,T 03 is the third preset temperature, and is the third preset temperature,t 3 is composed ofT 3 ≥T 03 The duration of the time period of (c) is,t 03 a third preset duration;
the first preset temperature is calculated by the following formula:T 01 ＝α*T 001 wherein, in the step (A),αis a first scale factor and is a function of,T 001 the temperature of the outdoor coil pipe after the defrosting of the outdoor heat exchanger is finished is detected in the defrosting test process of the air conditioner; the second preset temperature is calculated by the following formula:T 02 ＝β*T 002 wherein, in the step (A),βis a second scaling factor to be used for the second scaling factor,T 002 the refrigerant outlet temperature after defrosting of the outdoor heat exchanger is detected in the defrosting test process of the air conditioner; the third preset temperature is calculated by the following formula:T 03 ＝δ*T 003 wherein, in the process,δis a third scaling factor that is a function of,T 003 the temperature of the upper shell after the defrosting of the outdoor heat exchanger is finished is detected in the defrosting test process of the air conditioner;
controlling a down-conversion operation of the compressor, comprising:
under the condition that a first temperature difference value between the maximum value of the upper shell temperature of the outdoor heat exchanger recorded after the air conditioner is started and operated at the time and the upper shell temperature is larger than a first preset temperature difference threshold value, acquiring a first target frequency reduction value according to the first temperature difference value;
controlling the compressor to carry out frequency reduction operation according to the first target frequency reduction value based on the current running frequency of the compressor;
alternatively, controlling the compressor down-conversion operation comprises:
under the condition that a second temperature difference value between the outdoor coil pipe temperature and the outdoor environment temperature is smaller than a second preset temperature difference threshold value, acquiring a second target frequency reduction value according to the second temperature difference value;
and controlling the compressor to carry out frequency reduction operation according to the second target frequency reduction value based on the current operating frequency of the compressor.
2. The control method of claim 1, wherein obtaining the first target down-conversion value according to the first temperature difference comprises:
acquiring a corresponding first frequency reduction value from a first incidence relation according to the first temperature difference value;
the first downconversion value is taken as the first target downconversion value.
3. The control method of claim 1, wherein obtaining the second target down-conversion value according to the second temperature difference comprises:
acquiring a corresponding second frequency reduction value from a second incidence relation according to the second temperature difference;
taking the second downconversion as the second target downconversion.
4. A control device for air conditioner defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting according to any one of claims 1 to 3 when executing the program instructions.
5. An air conditioner, comprising:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
a control apparatus for defrosting an air conditioner in accordance with claim 4, electrically connected to said compressor.
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