CN110469971B - 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 PDF

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Publication number
CN110469971B
CN110469971B CN201910675285.1A CN201910675285A CN110469971B CN 110469971 B CN110469971 B CN 110469971B CN 201910675285 A CN201910675285 A CN 201910675285A CN 110469971 B CN110469971 B CN 110469971B
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refrigerant
heating
temperature
air conditioner
rate
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CN110469971A (en
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许文明
罗荣邦
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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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
    • 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
    • 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
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • 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
    • 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
    • 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: acquiring the temperature of an outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode; and after the condition that defrosting entry conditions are met is determined according to the temperature of the outdoor coil, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet pipeline and a refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner to be heated. The control method provided by the embodiment of the disclosure can judge whether the air conditioner meets the defrosting entry condition according to the temperature of the outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, and effectively improves the control precision for controlling the defrosting of the air conditioner; and the adverse effect of frost condensation on the heating performance of the air conditioner is reduced by heating the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.

Description

Control method and device for defrosting of air conditioner and air conditioner
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 refrigerating double mode, and here, users generally adjust the air conditioners to a heating mode under the conditions of low-temperature areas or climates with heavy wind and snow so as to utilize the air conditioners to increase the temperature of indoor environments; 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 influenced 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 following methods are mainly used to defrost the outdoor heat exchanger: 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 pressure states of the refrigerant in the refrigerant pipeline, so that the refrigerant 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 process of the defrosting mode of the outdoor heat exchanger shown in the above embodiment has more or less influence on the normal heating performance of the air conditioner, the air conditioner performs defrosting judgment before defrosting, and then controls whether the air conditioner performs defrosting according to the judgment result; in the related art, defrosting judgment is generally performed by comparing numerical values between outdoor environment temperature and frost point temperature, and because a frosting device of an outdoor heat exchanger is influenced by various factors such as outdoor environment, self running state and the like, the defrosting judgment mode is too rough, and the requirement of an air conditioner for accurately triggering defrosting action is difficult to meet.
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 and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for air conditioner defrosting and an air conditioner, and aims to solve the technical problem of low air conditioner defrosting judgment accuracy in the related art.
In some embodiments, the control method for defrosting an air conditioner includes:
acquiring the temperature of an outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode;
and after the condition that defrosting entry conditions are met is determined according to the temperature of the outdoor coil, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet pipeline and a refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner to be heated.
In some embodiments, the control device for defrosting an air conditioner includes:
a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the control method for air conditioner defrosting in some of the embodiments described above.
In some embodiments, the air conditioner includes:
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 first heating device is arranged on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting an air conditioner according to some embodiments described above is electrically connected to the first heating device and the second heating device, respectively.
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:
the control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired outdoor coil temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant inlet pipe way and refrigerant outlet pipe way, can enough effectively improve the refrigerant temperature of inflow outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost of condensing on the outdoor heat exchanger, also can improve the refrigerant temperature who flows back to the compressor to promote heating efficiency, reduce the adverse effect of frost condensation to air conditioner self heating performance.
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 of a control method for defrosting an air conditioner according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and advantages of the embodiments of the present disclosure can be understood in detail, a more particular description of the embodiments of the disclosure, briefly summarized above, may be had by reference to the appended drawings, which are included to illustrate, but are not intended to limit the embodiments of the disclosure. 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 flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
As shown in fig. 1, an embodiment of the present disclosure provides a control method for defrosting an air conditioner, which can be used to solve the problem that when the air conditioner operates in rain and snow or under low-temperature and severe cold conditions, an outdoor heat exchanger frosts and affects the normal heating performance of the air conditioner; in an embodiment, the main flow steps of the control method include:
s101, acquiring the temperature of an outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of a heating mode of air conditioner operation;
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 a low temperature and a 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.
When the air conditioner operates in other modes such as a cooling mode and a dehumidification mode, because the problem of frosting of the outdoor unit of the air conditioner generally does not occur under the outdoor working conditions corresponding to the modes, optionally, when the air conditioner operates in other non-heating modes, the flow control process corresponding to the control method is not started, so that the situation that the defrosting action aiming at the outdoor heat exchanger is mistakenly triggered in the modes such as the cooling mode and the dehumidification mode of the air conditioner is avoided, and the normal cooling or dehumidification working process of the air conditioner is influenced is avoided.
In an optional embodiment, a coil position of an outdoor heat exchanger of the outdoor air conditioner outdoor unit is provided with a first temperature sensor, and the first temperature sensor can be used for detecting the real-time temperature of the coil position of the first temperature sensor; thus, the outdoor coil temperature acquired in step S101 may be the real-time temperature of the coil position detected by the first temperature sensor.
In the embodiment of the disclosure, the temperature change of the coil pipe position of the outdoor heat exchanger is a temperature change condition of a refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor environment temperature and the internal refrigerant temperature, and is generally a pipeline part of the outdoor heat exchanger, which is easy to cause a 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.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a second temperature sensor, and the second temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant inlet pipeline of the outdoor heat exchanger; therefore, the liquid inlet temperature of the refrigerant obtained in step S101 may be the real-time temperature of the refrigerant detected by the second temperature sensor;
here, the refrigerant liquid inlet line is a line through which the refrigerant flows into the outdoor heat exchanger when the air conditioner operates in the heating mode.
In the embodiment of the disclosure, the temperature of the refrigerant flowing into the outdoor heat exchanger is an internal temperature factor directly influencing the shell temperature of the outdoor heat exchanger; here, when the air conditioner operates in a heating mode, the outdoor heat exchanger absorbs heat from the outdoor environment, and the heat transfer sequence is the refrigerant in the indoor pipelines of the outdoor environment, the outdoor heat exchanger shell and the outdoor heat exchange shell; because the temperature difference between the outdoor heat exchanger and the heat exchanger can influence the heat conduction efficiency, the temperature of the refrigerant flowing into the outdoor heat exchanger can change the heat conduction rate of the refrigerant in the internal pipeline from the outdoor heat exchanger shell, and further can influence the temperature change of the outdoor heat exchanger shell; therefore, the obtained refrigerant inlet liquid temperature can be used as a reference factor for measuring the influence of the internal temperature condition of the air conditioner on the frosting of the outdoor heat exchanger.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a third temperature sensor, and the third temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger; therefore, the refrigerant liquid outlet pipeline obtained in step S101 may be the real-time temperature of the refrigerant detected by the third 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.
In the embodiment of the disclosure, the temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency between 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 less. 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.
And S102, after the condition that the defrosting entry condition is met is determined according to the temperature of the outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, controlling the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner to be heated.
The air conditioner is preset with a defrosting entry condition, and whether the air conditioner meets the defrosting entry condition or not can be judged according to the acquired parameters when the air conditioner operates in a heating mode; if so, the air conditioner needs to defrost the outdoor heat exchanger; if not, the air conditioner does not need to defrost the outdoor heat exchanger.
In the embodiment of the present disclosure, the air conditioner determines whether the defrosting entry condition is satisfied according to the three parameters of the outdoor coil temperature, the refrigerant liquid inlet temperature, and the refrigerant liquid outlet temperature obtained in step S101; the temperature of the outdoor coil pipe can sensitively reflect the temperature change condition of a refrigerant pipeline of the outdoor heat exchanger, the liquid inlet temperature of the refrigerant is an internal temperature factor influencing the shell temperature of the outdoor heat exchanger, and the liquid outlet temperature of the refrigerant is a reference factor reflecting the current frosting degree of the outdoor heat exchanger; therefore, the embodiment of the disclosure integrates the three factor parameters to judge whether the air conditioner has the frosting problem, so that the judgment precision of the defrosting of the air conditioner can be greatly improved, and the defrosting operation triggered by the air conditioner can better accord with the real-time frosting condition of the air conditioner.
In an alternative embodiment, the defrost entry condition in step S102 includes:
△T e t is not less than V and T Discharging liquid -T Feeding liquid ≤△T1，T e ≤T Threshold value And T is Discharging liquid -T e ≤△T2；
Wherein, T e Is the outdoor coil temperature, Δ T e T is T e The temperature change rate in unit time t, V is a preset temperature change rate threshold; t is Feeding liquid Is the temperature of the refrigerant inlet liquid, T Discharging liquid For the temperature of the refrigerant outlet liquid, the delta T1 is a preset first temperature difference threshold value, the delta T2 is a preset second temperature difference threshold value, and T Threshold value Is a preset temperature threshold.
In the defrosting entering condition, the temperature change rate of the outdoor coil temperature in unit time can reflect the situation that the temperature of the outdoor coil changes rapidly and slowly under the common influence of the internal environment and the external environment of the air conditioner; generally, when the outdoor environment has good working condition and the air conditioner is normally operated for heating, the temperature change of the refrigerant flowing into the outdoor unit is not large, so that the change rate of the temperature of the outdoor coil pipe is small; when the outdoor environment is changed into a severe working condition which easily causes the frost condensation of the outdoor heat exchanger, the temperature of the outdoor coil pipe is quickly reduced under the influence of the temperature change of the outdoor environment, so that the temperature change rate of the outdoor coil pipe can also generate large fluctuation; therefore, one of defrosting entering conditions of the defrosting device is that defrosting judgment is carried out according to the temperature change speed of the outdoor coil pipe under different outdoor working conditions.
Meanwhile, the defrosting entry condition in the embodiment of the disclosure is added with the temperature T of the refrigerant outlet liquid Discharging liquid And refrigerant feed temperature T Feeding liquid The temperature difference between the two is judged, if the temperature difference between the two is smaller, the heat absorption and temperature rise efficiency of the refrigerant is lower, and the refrigerant possibly causes frosting of the air conditioner, so that the outdoor heat exchanger of the air conditioner needs to be defrosted under the condition; therefore, the temperature of the molten metal is controlled,the application also introduces a sub-condition for judging defrosting according to the temperature of the refrigerant inlet and outlet liquid, so that the accuracy of judging defrosting is further improved.
The temperature of the outdoor coil can reflect whether the pipeline of the indoor heat exchanger reaches the temperature condition capable of forming frost or not; optionally, the preset temperature threshold is a value less than or equal to a frost-condensation critical temperature, and when the temperature of the outdoor coil is less than the temperature threshold, the temperature of the coil of the outdoor heat exchanger and other pipelines reaches a temperature condition that the outdoor heat exchanger may generate frost.
In addition, when the air conditioner has the frosting problem, due to the obstruction of the frost layer, the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is reduced, and the temperature of the refrigerant is a main factor influencing the temperature of the outdoor coil at the moment, so that when the temperature difference between the outlet liquid temperature of the refrigerant and the temperature of the outdoor coil is small, the frosting problem possibly exists in the outdoor heat exchanger of the air conditioner at the moment.
Therefore, the defrosting entry condition in the embodiment of the disclosure comprehensively considers the influence of the parameters on the frosting of the outdoor heat exchanger under different working conditions, so that the judgment precision of the air conditioner defrosting can be effectively improved, and the problems of misjudgment, mistriggering and the like are reduced.
In the embodiment of the disclosure, after it is determined that the defrosting entry condition is satisfied according to the outdoor coil temperature, the refrigerant liquid inlet temperature, and the refrigerant liquid outlet temperature, the defrosting operation of the air conditioner includes controlling to heat the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
The temperature of the refrigerant flowing into the outdoor heat exchanger can be increased by heating the refrigerant flowing through the refrigerant liquid inlet pipeline, and at the moment, the temperature of the refrigerant flowing into the outdoor heat exchanger is higher, so that heat is transferred to one side of an outdoor environment, the heat of the refrigerant with the increased temperature can be utilized to melt frost of the outdoor heat exchanger, and meanwhile, the temperature of the refrigerant flowing out of the outdoor heat exchanger and flowing back to the compressor can be increased, so that the heating performance of the air conditioner is enhanced.
The heating of the refrigerant flowing through the refrigerant liquid outlet pipeline can compensate the heat loss of the refrigerant in the defrosting process of the outdoor heat exchanger, and can further improve the temperature of the refrigerant flowing back to the compressor.
Optionally, a first heating device is disposed at a refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid inlet pipeline; the refrigerant outlet pipeline of the outdoor heat exchanger is provided with a second heating device which is set to controllably heat the refrigerant flowing through the refrigerant outlet pipeline.
Therefore, in step S102, after it is determined that the defrosting entry condition is satisfied according to the outdoor coil temperature, the refrigerant liquid inlet temperature, and the refrigerant liquid outlet temperature, the first heating device and the second heating device may be controlled to be turned on; and under the condition that the defrosting entry condition is not met according to the temperature of the outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, the first heating device and the second heating device are kept in a closed state.
In an embodiment, the first heating device and the second heating device are electromagnetic heating devices, and the electromagnetic heating devices heat the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conduct heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to achieve the purpose of heating the refrigerant.
The electromagnetic heating device mainly comprises an induction coil and a power supply module, wherein the induction coil is wound on the refrigerant pipeline section, and the power supply module can provide alternating current for the induction coil; when the induction coil is electrified, alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, and the alternating magnetic field can generate eddy currents in the refrigerant pipe section, so that the heating and warming effects can be realized by means of the energy of the eddy currents.
It should be understood that the type of the heating device for heating the refrigerant in the present application is not limited to the above electromagnetic heating device, and other types of heating devices that can be used for directly or indirectly heating the refrigerant in the related art may also use the technical solution of the present application and are covered by the protection scope of the present application.
In an optional embodiment, in step S102, when the refrigerant flowing through the refrigerant liquid inlet pipeline is controlled to be heated, a liquid inlet heating parameter of the refrigerant may be determined according to a temperature change rate or a temperature difference, and then a corresponding heating operation may be performed according to the heating parameter.
The temperature difference value of the refrigerant inlet liquid heating parameter comprises: a first temperature difference between the refrigerant liquid outlet temperature and the refrigerant liquid inlet temperature; the refrigerant liquid inlet heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid inlet pipeline.
In the above technical disclosure, the temperature change rate and the first temperature difference value are respectively the judgment of one of the sub-conditions for the defrosting entry condition; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the frosting degree of the outdoor heat exchanger may be estimated according to the temperature change rate or the first temperature difference, and the heating rate and the heating duration of the refrigerant flowing through the refrigerant liquid inlet pipeline may be selected according to the difference of the frosting degree.
For example, when the frosting degree of the outdoor heat exchanger is high, the heating rate of the refrigerant is set to be high, so that the heating and temperature rising speed of the refrigerant is increased, and the defrosting temperature requirement can be met as soon as possible; setting the heating time of the refrigerant to be longer so that the heat of the refrigerant has enough time to be conducted to the outer surface of the outdoor heat exchanger for defrosting; on the contrary, when the frosting degree of the outdoor heat exchanger is low, the heating rate of the refrigerant is set to be low, and the heating time is set to be short, so that the power consumption of the operation of the first heating device is reduced, and the use cost of the air conditioner is reduced.
Optionally, determining a liquid inlet heating rate of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature change rate includes: and according to the temperature change rate, acquiring a corresponding first liquid inlet heating rate from the first rate incidence relation so as to heat according to the first liquid inlet heating rate.
Here, the first rate correlation includes one or more temperature change rates corresponding to the heating rate of the first feed liquid. An alternative temperature rate of change is shown in table 1, herein, as a function of the first feed heating rate, as shown in the table below,
Figure BDA0002143062320000091
TABLE 1
In the first rate correlation, the first feed liquid heating rate is positively correlated with the temperature change rate. Namely, the larger the temperature change rate is, the higher the heating rate of the first feed liquid is; and the smaller the first temperature difference, the lower the first feed heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipeline in step S102 is performed, a first inlet liquid heating rate corresponding to the temperature change rate may be determined according to the first rate association relationship, and then heating may be performed according to the first inlet liquid heating rate.
Optionally, determining a liquid inlet heating rate of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature difference includes: according to the first temperature difference, acquiring a corresponding second liquid inlet heating rate from a second rate incidence relation, and heating according to the second liquid inlet heating rate;
here, the second rate correlation includes a correspondence of one or more first temperature differences to the second feed heating rate. An alternative first temperature difference versus second feed heating rate is shown in table 2, herein below,
first temperature difference (Unit:. degree. C.) Second feed heating Rate (Unit:. degree. C/min)
a1＜T Discharging liquid -T Feeding liquid ≤a2 v21
a2＜T Discharging liquid -T Feeding liquid ≤a3 v22
a3＜T Discharging liquid -T Liquid feed v23
TABLE 2
In the second rate correlation, the second feed heating rate is negatively correlated with the temperature difference. Namely, the larger the first temperature difference is, the lower the heating rate of the second feed liquid is; the smaller the first temperature difference, the higher the heating rate of the second feed liquid.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipeline in step S102 is performed, the second inlet liquid heating rate corresponding to the temperature difference value may be determined according to the second rate association relationship, and then the heating operation may be performed according to the second inlet liquid heating rate.
In the above embodiment, because the frosting degree of the outdoor heat exchanger has different influence ranges on the temperature change rate of the outdoor coil and the temperature change of the temperature difference, the outdoor coil and the outdoor coil are respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships according to actual needs to determine the corresponding heating rate.
Optionally, the specifically selected rate association relationship may be determined according to the heating requirement of the current user, for example, when the heating requirement of the current user is low, the first rate association relationship is selected, and at this time, the influence of the outdoor coil temperature and the like corresponding to the temperature change rate on the defrosting effect is mainly considered; and when the heating demand of the current user is higher, the second rate incidence relation is selected, and at the moment, the influence of frosting of the outdoor heat exchanger on the refrigerant outlet temperature of the refrigerant with the temperature higher and lower than the temperature of the refrigerant flowing back to the compressor is mainly considered, so that the return air temperature of the refrigerant can be increased after the refrigerant is heated, and the heating performance is ensured.
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.
Therefore, 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 taken into consideration when the defrosting operation for heating the refrigerant 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.
Similarly, in some optional embodiments, the corresponding first liquid heating time period may be further obtained from the first time period correlation according to the temperature change rate, so as to heat according to the first liquid heating time period.
Here, in the first time period correlation, the first inlet liquid heating time period is positively correlated with the temperature change rate.
Or acquiring corresponding second liquid inlet heating time length from the second time length incidence relation according to the temperature difference so as to heat according to the second liquid inlet heating time length.
Here, in the second period correlation, the second liquid-heating period and the second temperature difference are in negative correlation.
In the above embodiment, the manner of obtaining the first liquid heating time period according to the temperature change rate and obtaining the second liquid heating time period according to the temperature difference may refer to the control flow for obtaining the liquid heating rate, which is not described herein again.
Similarly, for the refrigerant outlet liquid heating parameters, the temperature difference comprises: a second temperature difference between the outdoor coil temperature and a preset temperature threshold value, or a third temperature difference between the refrigerant outlet temperature and the outdoor coil temperature; the refrigerant outlet liquid heating parameters comprise heating rate and/or heating time of the refrigerant flowing through the refrigerant outlet pipeline.
In the above technical context, the second temperature difference and the third temperature difference are also one of the sub-conditions of the defrost entry condition in the foregoing; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the influence of frosting on the heating performance of the air conditioner by the outdoor heat exchanger can be estimated according to the second temperature difference and the third temperature difference, and the heating rate and the heating duration of the refrigerant flowing through the refrigerant outlet pipe are selected according to different influences on the heating performance, so as to satisfy the heating performance requirement of the air conditioner.
For example, when the frosting degree of the outdoor heat exchanger is high, the attenuation of the thermal performance of the air conditioner is high, the heating rate of the refrigerant is set to be high, so that the heating and temperature rising speed of the flowing-out refrigerant is increased, and the requirement of the return air temperature can be met as soon as possible; setting the heating time of the refrigerant to be longer so as to heat the refrigerant flowing out of the outdoor heat exchanger and flowing back to the compressor for a long time under the condition that the outdoor heat exchanger is frosted seriously; on the contrary, when the frosting degree of the outdoor heat exchanger is low, the heating rate of the refrigerant is set to be low, and the heating time is set to be short, so that the power consumption of the operation of the first heating device is reduced, and the use cost of the air conditioner is reduced.
Optionally, determining a heating rate of the refrigerant flowing through the refrigerant liquid outlet pipeline according to the temperature difference includes: and according to the second temperature difference, obtaining the corresponding first effluent heating rate from the third rate incidence relation so as to heat according to the first effluent heating rate.
Here, the third rate correlation includes a correspondence between one or more second temperature differences and a heating rate of the first effluent. An alternative second temperature difference versus the first effluent heating rate is shown in table 3, here, as shown in the following table,
second temperature difference (Unit:. degree. C.) The heating rate of the first effluent (unit:. degree. C/min)
b1＜T e -T Threshold value ≤b2 v31
b2＜T e -T Threshold value ≤b3 v32
b3＜T e -T Threshold value v33
TABLE 3
In the third rate correlation, the first effluent heating rate and the second temperature difference are in positive correlation. Namely, the larger the second temperature difference is, the higher the heating rate of the first effluent is; and the smaller the second temperature difference, the lower the heating rate of the first outlet liquid.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant outlet pipeline in step S102 is performed, the first outlet heating rate corresponding to the second temperature difference may be determined according to the third rate association relationship, and then the heating operation may be performed according to the third heating rate.
Or, determining the heating rate of the refrigerant flowing through the refrigerant liquid outlet pipeline according to the temperature difference, including: and according to the third temperature difference, obtaining the corresponding second effluent heating rate from the fourth rate incidence relation so as to heat according to the second effluent heating rate.
Here, the fourth rate correlation includes a corresponding relationship between one or more third temperature differences and the heating rate of the second effluent. An alternative third temperature difference versus the second effluent heating rate is shown in table 4, here, as shown in the following table,
third temperature difference (Unit:. degree. C.) Heating rate of the second effluent (unit:. degree. C/min)
c1＜T Discharging liquid -T e ≤c2 v41
c2＜T Discharging liquid -T e ≤c3 v42
c3＜T Discharging liquid -T e v43
TABLE 4
In the fourth rate correlation, the heating rate of the second effluent is negatively correlated with the third temperature difference. Namely, the larger the third temperature difference is, the lower the heating rate of the second effluent is; and the smaller the third temperature difference is, the higher the heating rate of the second effluent is.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant outlet pipeline in step S102 is performed, the second outlet heating rate corresponding to the third temperature difference may be determined according to the fourth rate correlation, and then the heating operation may be performed according to the second outlet heating rate.
In the above embodiment, since the frosting degree of the outdoor heat exchanger has different influences on the thermal performance of the air conditioner, and further, the temperature change influences on the second temperature difference and the third temperature difference have different amplitudes, the air conditioner is respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships according to actual needs to determine the corresponding heating rate.
Optionally, the specifically selected rate association relationship may refer to technical contents shown in the foregoing embodiments, and details are not described herein.
Similarly, in some optional embodiments, the corresponding first effluent heating time length may be further obtained from the third time length correlation according to the second temperature difference, so as to heat the effluent according to the first effluent heating time length.
Here, in the third time length correlation, the first effluent heating time length and the second temperature difference are in positive correlation.
Or according to the third temperature difference, obtaining the corresponding second effluent heating time length from the fourth time length incidence relation, and heating according to the second effluent heating time length.
Here, in the fourth time-length correlation, the second effluent heating time length and the third temperature difference value are in negative correlation.
In the above embodiment, the manner of obtaining the liquid heating time length according to the temperature difference may refer to the control procedure of obtaining the liquid heating rate according to the temperature difference, which is not described herein again.
In some optional embodiments, after determining that the defrosting entry condition is satisfied according to the outdoor coil temperature, the refrigerant inlet temperature, and the refrigerant outlet temperature, the method further includes: the control reduces the operating frequency of the compressor of the air conditioner.
In an embodiment, by reducing the operating frequency of the compressor of the air conditioner, the heat absorption rate of the refrigerant in the outdoor heat exchanger can be reduced, and then adverse effects of further temperature reduction and increased frosting degree of the outdoor heat exchanger caused by heat absorption of the refrigerant can be weakened, so that the defrosting effect of the air conditioner in defrosting operation of heating the refrigerant in the refrigerant liquid inlet pipeline and the refrigerant in the refrigerant liquid outlet pipeline is improved.
After the air conditioner exits defrosting, the running frequency of the air conditioner compressor can be controlled to be recovered so as to meet the frequency requirement of normal heating operation of the air conditioner after the air conditioner exits defrosting.
In some alternative embodiments, after determining that the defrosting entry condition is satisfied according to the outdoor coil temperature, the refrigerant inlet temperature, and the refrigerant outlet temperature, the method further includes: controlling to reduce the rotating speed of an outdoor fan of the air conditioner or shutting down the outdoor fan, and/or controlling to reduce the rotating speed of an indoor fan of the air conditioner.
In the embodiment, the rotating speed of the indoor fan of the air conditioner is reduced, so that the heat exchange rate between the indoor heat exchanger and the indoor environment can be reduced, more heat can be reserved for the refrigerant flowing into the outdoor heat exchanger after the indoor heat exchanger flows out, the defrosting effect of the outdoor heat exchanger by using the heat of the refrigerant can be improved, and the running power consumption of the heating device for heating the refrigerant can also be reduced.
Meanwhile, by shutting down the outdoor fan, the heat exchange rate between the outdoor heat exchanger and the outdoor environment can be reduced, the adverse temperature influence of the low-temperature condition of the outdoor environment on frosting of the outdoor heat exchanger is reduced, and the heat dissipation of the refrigerant heat for defrosting is reduced, so that the actual defrosting effect in the defrosting process is ensured.
In some alternative embodiments, after determining that the defrosting entry condition is satisfied according to the outdoor coil temperature, the refrigerant inlet temperature, and the refrigerant outlet temperature, the method further includes: controlling and increasing the flow opening of the throttling device of the air conditioner.
In an embodiment, the flow opening of the throttling device of the air conditioner is increased, so that the throttling effect of the throttling device can be reduced, the temperature of the refrigerant flowing through the throttling device can be kept high, and the subsequent refrigerant flowing into the outdoor heat exchanger can achieve a good defrosting effect.
Fig. 2 is a flowchart illustrating a control method for defrosting an air conditioner according to another embodiment of the present disclosure.
As shown in fig. 2, the embodiment of the present disclosure provides another control method for defrosting an air conditioner, and the control steps mainly include:
s201, starting an air conditioner, and operating in a heating mode;
in this embodiment, a general user of the air conditioner sets the heating mode to the current mode to start the air conditioner in a low-temperature and severe-cold weather condition.
S202, detecting the temperature T of the outdoor coil e Refrigerant feed temperature T Feeding liquid And refrigerant outflow temperature T Discharging liquid ；
S203, calculating the temperature change rate Delta T of the outdoor coil temperature Te e /t；
S204, judging whether delta T exists e V and T are/T ≥ T Discharging liquid -T Liquid feed ≤△T1，T e ≤T Threshold value And T is Discharging liquid -T e Δ T2, if yes, executing step S205, if no, returning to execute step S202;
in the disclosed embodiment, Δ T e V and T are/T ≥ T Discharging liquid -T Feeding liquid ≤△T1，T e ≤T Threshold value And T is Discharging liquid -T e Delta T2 is less than or equal to the preset defrosting entrance condition.
If the defrosting entry condition is met, the problem that the outdoor heat exchanger of the air conditioner frosts at the moment is solved; and if the defrosting entering condition is not met, the problem that the outdoor heat exchanger of the air conditioner is frosted does not exist at the moment.
S205 according to Δ T e Obtaining corresponding first liquid inlet heating rate from the first rate correlation, and obtaining the corresponding first liquid inlet heating rate according to delta T e Obtaining corresponding first liquid inlet heating time length from the first time length incidence relation;
s206, according to T Feeding liquid -T ao Obtaining the corresponding third effluent heating rate from the third rate incidence relation, and obtaining the corresponding third effluent heating rate according to T Feeding liquid -T ao Acquiring corresponding third effluent heating time length from the third time length incidence relation;
in the embodiment of the present disclosure, reference may be made to the foregoing embodiments for specific implementation manners of steps S205 and S206, which are not described herein again.
S207, starting a first heating device according to the first feed liquid heating rate and the first feed liquid heating duration, and starting a second heating device according to a third effluent liquid heating rate and the third effluent liquid heating duration;
in an embodiment of the disclosure, the first heating device is disposed on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode, and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline. The second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline.
Optionally, the heating device is an electromagnetic heating device, and thus the adjustment of the first heating rate and the third heating rate can be realized by changing parameters such as operating current or voltage of the electromagnetic heating device.
S208, controlling to reduce the running frequency of the compressor to a first frequency; the flow ends.
The control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired outdoor coil temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant inlet pipe way and refrigerant outlet pipe way, can enough effectively improve the refrigerant temperature of inflow outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost of condensing on the outdoor heat exchanger, also can improve the refrigerant temperature who flows back to the compressor to promote heating efficiency, reduce the adverse effect of frost condensation to air conditioner self heating performance.
In some optional embodiments, after controlling to heat the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline, the method further includes: acquiring state parameters in the process of an air conditioner running heating mode; and after the defrosting exit condition is determined to be met according to the state parameters, controlling to stop heating.
Here, the state parameters during the air conditioner operation heating mode are at least one or more of the following parameter types: outdoor environment temperature, refrigerant inlet temperature, refrigerant outlet temperature and outdoor coil temperature. It should be understood that the status parameters obtained in the present application are not limited to the types of parameters shown in the above embodiments.
Correspondingly, the defrosting exit condition is preset according to the specifically obtained parameter type, generally, when the air conditioner meets the defrosting exit condition, it is indicated that the outdoor heat exchanger has finished defrosting, and no frost or only a small amount of frost exists on the outdoor heat exchanger, so that the influence on the normal heating performance of the air conditioner is low; for example, when the parameter type is the outdoor ambient temperature, an optional defrost exit condition is that the outdoor ambient temperature is greater than or equal to a preset outer loop temperature threshold.
Judging whether the defrosting exit condition is met or not according to the outdoor environment temperature after the outdoor environment temperature is obtained; if yes, controlling to stop heating; if not, the current operation working state is maintained unchanged, and the heating of the refrigerant liquid inlet pipeline is still kept.
In the embodiment of the disclosure, in the process of respectively heating the refrigerants flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline, the air conditioner performs the judgment operation on the defrosting exit condition in real time according to the parameters of the air conditioner, so as to stop the heating operation on the refrigerants under the condition that the defrosting exit condition is met, thereby effectively reducing the power consumption for operating the two heating devices.
Fig. 3 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 an air conditioner, which has a structure as shown in fig. 3, and includes:
a processor (processor)300 and a memory (memory)301, and may also include a Communication Interface 302 and a bus 303. The processor 300, the communication interface 302 and the memory 301 may communicate with each other via a bus 303. The communication interface 302 may be used for information transfer. The processor 300 may call logic instructions in the memory 301 to perform the control method for defrosting an air conditioner of the above-described embodiment.
In addition, the logic instructions in the memory 301 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 301 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 300 executes functional applications and data processing by executing program instructions/modules stored in the memory 301, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 301 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 301 may include a high speed random access memory and may also include a non-volatile memory.
Fig. 4 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
As shown in fig. 4, the present disclosure also provides an air conditioner, including:
a refrigerant circulation circuit formed by connecting an outdoor heat exchanger 41, an indoor heat exchanger 42, a throttling device 43 and a compressor 44 through refrigerant pipelines;
the first heating device 451 is arranged on the refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device 452 is disposed on the refrigerant outlet pipe of the outdoor heat exchanger 41 in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipe;
the control device 46 for defrosting the air conditioner is electrically connected to the first heating device 451 and the second heating device 452, respectively. Here, the control device for air conditioner defrosting is the control device shown in the foregoing embodiment.
The air conditioner in the embodiment of the disclosure can accurately detect and judge whether the air conditioner has the frosting problem or not, and under the condition that the frosting problem exists in the air conditioner, utilize foretell controlling means and heating device to carry out corresponding defrosting operation to reduce the frost amount of condensing on the outdoor heat exchanger of air conditioner, guarantee that the air conditioner can normally heat the indoor environment under the low temperature severe cold climate condition, promote user's use and experience.
Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.
Embodiments of the present disclosure also provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described 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 removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and 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 elements. 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 additional identical elements in the process, method or apparatus comprising 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 only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be 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 (8)

1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
acquiring the temperature of an outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode;
after the condition that defrosting entry conditions are met is determined according to the temperature of the outdoor coil, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner is controlled to be heated; and controlling to reduce an operating frequency of a compressor of the air conditioner; or controlling to reduce the rotating speed of an outdoor fan of the air conditioner or shutting down the outdoor fan, and/or controlling to reduce the rotating speed of an indoor fan of the air conditioner; or controlling and increasing the flow opening of a throttling device of the air conditioner;
the defrost entry conditions include:
△T e t is not less than V and T Discharging liquid -T Feeding liquid ≤△T1，T e ≤T Threshold value And T is Discharging liquid -T e ≤△T2；
Wherein, T is e For the outdoor coil temperature, the Δ T e T is said T e The temperature change rate in unit time t, V is a preset temperature change rate threshold; the T is Feeding liquid Is the refrigerant inlet temperature, T Discharging liquid Delta T1 is a preset first temperature difference threshold value delta for the refrigerant outlet liquid temperatureT2 is a preset second temperature difference threshold value, T Threshold value Is a preset temperature threshold;
the refrigerant liquid inlet heating parameters for heating the refrigerant flowing through the refrigerant liquid inlet pipeline are determined according to the temperature change rate or the temperature difference value and a preset incidence relation; the temperature difference includes: a first temperature difference between the refrigerant liquid outlet temperature and the refrigerant liquid inlet temperature; the refrigerant liquid inlet heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid inlet pipeline; the preset incidence relation is selected from a first rate incidence relation and a second rate incidence relation according to the heating requirement of a user; the first rate correlation is a corresponding relation between a temperature change rate and a first feed liquid heating rate, and the second rate correlation is a corresponding relation between a first temperature difference and a second feed liquid heating rate.
2. The control method according to claim 1,
the refrigerant outlet liquid heating parameters for heating the refrigerant flowing through the refrigerant outlet pipeline are determined according to the temperature difference;
for the refrigerant outlet liquid heating parameters, the temperature difference comprises: a second temperature difference between the outdoor coil temperature and the preset temperature threshold value, or a third temperature difference between the refrigerant outlet liquid temperature and the outdoor coil temperature;
the refrigerant liquid outlet heating parameters comprise heating rate and/or heating duration of the refrigerant flowing through the refrigerant liquid outlet pipeline.
3. The control method according to claim 2,
determining the heating rate of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature change rate, wherein the method comprises the following steps: according to the temperature change rate, acquiring a corresponding first liquid inlet heating rate from a first rate incidence relation, and heating according to the first liquid inlet heating rate;
determining the heating rate of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature difference, comprising the following steps of: and according to the first temperature difference, acquiring a corresponding second liquid inlet heating rate from a second rate incidence relation so as to heat according to the second liquid inlet heating rate.
4. The control method according to claim 2,
determining the heating time of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature change rate, wherein the method comprises the following steps: according to the temperature change rate, acquiring corresponding first liquid inlet heating time length from a first time length incidence relation, and heating according to the first liquid inlet heating time length;
determining the heating time length of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature difference, wherein the determining step comprises the following steps of: and acquiring corresponding second liquid inlet heating time length from a second time length incidence relation according to the temperature difference so as to heat according to the second liquid inlet heating time length.
5. The method of claim 2, wherein determining a heating rate of the refrigerant flowing through the refrigerant outlet line based on the temperature difference comprises:
according to the second temperature difference, obtaining a corresponding first effluent heating rate from a third rate incidence relation, and heating according to the first effluent heating rate; or the like, or, alternatively,
and according to the third temperature difference, acquiring a corresponding second effluent heating rate from a fourth rate incidence relation, and heating according to the second effluent heating rate.
6. The control method of claim 2, wherein determining a heating time period for the refrigerant flowing through the refrigerant outflow line according to the temperature difference comprises:
according to the second temperature difference, obtaining corresponding first effluent heating time length from a third time length incidence relation, and heating according to the first effluent heating time length; or the like, or, alternatively,
and acquiring corresponding second effluent heating time length from a fourth time length incidence relation according to the third temperature difference so as to heat according to the second effluent heating time length.
7. A control apparatus for air conditioner defrosting comprising a processor and a memory having stored thereon 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 6 when executing the program instructions.
8. 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;
the first heating device is arranged on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting an air conditioner according to claim 7, which is electrically connected to the first heating device and the second heating device, respectively.
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