CN110469969B - 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
CN110469969B
CN110469969B CN201910675264.XA CN201910675264A CN110469969B CN 110469969 B CN110469969 B CN 110469969B CN 201910675264 A CN201910675264 A CN 201910675264A CN 110469969 B CN110469969 B CN 110469969B
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heating
temperature
refrigerant
air conditioner
outdoor
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CN110469969A (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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

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: in the process of the air conditioner running heating mode, acquiring the outdoor air outlet temperature of the outdoor unit and the upper shell temperature of the outdoor heat exchanger; and after the condition that the defrosting entry condition is met is determined according to the outdoor air outlet temperature and the temperature of the upper shell, 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 control method can judge whether the air conditioner meets defrosting entry conditions according to the obtained outdoor air outlet temperature of the outdoor unit and the obtained upper shell temperature of the outdoor heat exchanger, and improves the control precision of controlling the defrosting of the air conditioner; and by heating the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline, the heating efficiency is improved, and 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

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 refrigeration and refrigeration double mode, and here, under a low-temperature area or a climate condition with large wind and snow, a user generally adjusts the air conditioner to a heating mode so as to utilize the air conditioner to increase the temperature of an indoor environment; 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 embodiment has more or less influence on the normal heating performance of the air conditioner, the air conditioner carries out defrosting judgment before defrosting, and then controls whether the air conditioner carries out defrosting according to the judgment result; generally, in the related art, defrosting is judged by comparing numerical values between outdoor environment temperature and frost point temperature, and because a frosting device of the 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 the 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 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 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:
in the process of the air conditioner running heating mode, acquiring the outdoor air outlet temperature of the outdoor unit and the upper shell temperature of the outdoor heat exchanger;
and after the condition that the defrosting entry condition is met is determined according to the outdoor air outlet temperature and the temperature of the upper shell, 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.
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 a control method for air conditioner defrosting as described in some embodiments above.
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 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 as described in some embodiments 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 provided by the embodiment of the disclosure can comprehensively judge whether the air conditioner meets the defrosting entry condition according to the obtained parameters of the outdoor air outlet temperature of the outdoor unit and the temperature of the upper shell of the outdoor heat exchanger, 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 flowchart illustrating 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 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 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.
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 rainy or snowy conditions or in 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, in the process of an air conditioner running heating mode, acquiring the outdoor air outlet temperature of an outdoor unit and the temperature of an upper shell of an outdoor heat exchanger;
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, a dehumidification mode and the like, because the outdoor working conditions corresponding to the modes generally do not cause the problem of frosting of the outdoor unit of the air conditioner, 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 of the outdoor heat exchanger is mistakenly triggered in the modes such as the cooling mode and the dehumidification mode of the air conditioner, and the normal cooling or dehumidification working process of the air conditioner is influenced is avoided.
In an alternative embodiment, the outdoor unit of the air conditioner is provided with a first temperature sensor, and the first temperature sensor can be used for detecting the real-time outlet air temperature of the outlet air flow of the outdoor unit; therefore, the outdoor outlet air temperature obtained in step S101 may be the real-time temperature of the outdoor outlet air flow detected by the first temperature sensor;
optionally, the first temperature sensor is disposed on an air outlet grille of the outdoor unit, so that the first temperature sensor is located on an air outlet path of an air outlet flow of the outdoor heat exchanger, thereby improving detection accuracy of the outdoor air outlet temperature.
In the embodiment of the disclosure, the outdoor outlet air temperature can reflect the temperature change condition of the outdoor environment discharged into the outdoor environment after the heat exchange between the outdoor environment and the outdoor unit is carried out to a certain extent, and further can reflect the heat exchange amount or the heat exchange efficiency between the outdoor environment and the outdoor unit; for example, in the case where frost is condensed on the outer surface of the casing of the outdoor heat exchanger, the amount of heat exchange between the outdoor heat exchanger and the outdoor environment is reduced, the heat exchange efficiency is reduced, and the amount of heat absorbed by the air flowing through the outdoor heat exchanger is reduced, so that the temperature of the outlet air flow is slightly higher than that in the case where frost is not condensed on the outdoor heat exchanger; therefore, the acquired change condition of the outdoor outlet air temperature can be used as a reference factor for measuring the frosting degree of 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 a refrigerant pipeline flowing through the upper shell or the upper part of the outdoor heat exchanger; therefore, the upper case temperature acquired in step S101 may be a real-time temperature detected by the second temperature sensor;
in this embodiment, the refrigerant liquid inlet pipeline of the outdoor heat exchanger is disposed at the lower portion, and the refrigerant liquid outlet pipeline of the outdoor heat exchanger is disposed at the upper portion, so that the refrigerant flows into the outdoor heat exchanger from the lower portion and flows out of the outdoor heat exchanger from the upper portion 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.
And S102, after the condition that the defrosting entry condition is met is determined according to the outdoor air outlet temperature and the temperature of the upper shell, 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 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 parameters such as the outdoor outlet air temperature of the outdoor unit and the upper casing temperature of the outdoor heat exchanger obtained in step S101; therefore, the embodiment of the disclosure integrates the factor parameters to judge whether the air conditioner has the frosting problem, and can greatly improve the judgment precision of the air conditioner defrosting, so that 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 max -T air outlet ≤△T1，T Upper shell max -T Upper shell ≥△T2，T Discharging liquid -T Feeding liquid Δ T3, and T Discharging liquid -T Upper shell ≤△T4；
Wherein, T max The maximum value of the outdoor air outlet temperature, T, recorded after the air conditioner is started up and operated Air outlet Is the outdoor air-out temperature, T Upper casing max The maximum value of the temperature of the upper shell, T, of the outdoor heat exchanger recorded after the air conditioner is started up and operated at this time Upper shell Is the upper shell temperature, T, of the outdoor heat exchanger Feeding liquid Is the refrigerant inlet temperature, T, of the refrigerant flowing through the refrigerant inlet line Discharging liquid The temperature of the refrigerant flowing through the refrigerant outlet pipeline in the heating mode of the outdoor heat exchanger is determined by a first temperature difference threshold value delta T1, a second temperature difference threshold value delta T2 and a temperature difference between the refrigerant and the refrigerant outlet pipeline3 is a preset third temperature difference threshold value, and Δ T4 is a preset fourth temperature difference threshold value.
In the defrosting entering condition, the heat exchange efficiency of the outdoor environment and the outdoor heat exchanger under different frosting conditions can be reflected by the temperature difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature; for example, when the air conditioner is not frosted, the outdoor outlet air temperature is slightly lower, so that the difference between the maximum outdoor outlet air temperature and the outdoor outlet air temperature is larger; and under the condition that the air conditioner is frosted, the outdoor air outlet temperature is slightly higher, so the difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature is small. Like this, one of the defrosting admission condition of this application is according to the temperature variation of outdoor air-out temperature under the different outdoor operating mode promptly and carries out the defrosting judgement.
In addition, the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature of the outdoor heat exchanger, which are recorded after the air conditioner is started for operation, 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 upper shell temperature of the outdoor heat exchanger can be used as parameters for judging the frosting degree of the air conditioner.
Meanwhile, the defrosting entry condition of the air conditioner 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 sub-condition for judging defrosting according to the temperature of the refrigerant inlet and outlet liquid is introduced into the defrosting inlet condition so as to further improve the accuracy of judging defrosting.
Therefore, when such a defrosting entry condition is set, step S101 further includes obtaining a refrigerant inlet temperature and a refrigerant outlet temperature.
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 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 third 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; the temperature difference between the outdoor heat exchanger and the heat exchanger can influence the heat conduction efficiency, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can change the heat conduction rate of the refrigerant flowing from the outdoor heat exchanger shell to the internal pipeline, 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 fourth temperature sensor, and the fourth 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 coolant liquid outlet pipeline obtained in step S101 may be a real-time temperature of the coolant detected by the fourth 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, under the conditions that 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.
In addition, when the air conditioner has the problem of frosting, the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is reduced due to the obstruction of the frost layer, and the temperature of a refrigerant is a main factor influencing the outdoor heat exchanger at the moment, particularly the temperature of a shell positioned at the upper part; therefore, when the temperature difference between the refrigerant outlet liquid temperature and the upper shell temperature is small, the frosting problem of the air conditioner outdoor heat exchanger is solved.
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 outlet air temperature and the upper case temperature, the defrosting operation of the air conditioner includes controlling to heat the refrigerant flowing through the refrigerant inlet pipe of the outdoor heat exchanger of the air conditioner to increase the temperature of the refrigerant flowing into the outdoor heat exchanger, and at this time, since the temperature of the refrigerant flowing into the outdoor heat exchanger is higher, heat is transferred to one side of the outdoor environment, so that not only can frost of the outdoor heat exchanger be melted by using the heat of the refrigerant with the increased temperature, but also the temperature of the refrigerant flowing out of the outdoor heat exchanger and returning to the compressor can be increased, so as to enhance the heating performance of the air conditioner.
Optionally, a 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; therefore, in step S102, after it is determined that the defrosting entry condition is satisfied according to the outdoor outlet air temperature and the upper casing temperature, the heating device may be controlled to be turned on; and under the condition that the defrosting entering condition is determined not to be met according to the outdoor air outlet temperature and the upper shell temperature, the closing state of the heating device is kept.
In one embodiment, the heating device is an electromagnetic heating device, which heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat 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.
In an alternative embodiment, in step S102, when controlling to heat the refrigerant flowing through the refrigerant inlet pipeline, a refrigerant inlet heating parameter may be determined according to the temperature difference, so that a corresponding heating operation is performed according to the refrigerant inlet heating parameter.
The temperature difference value of the refrigerant inlet liquid heating parameter comprises: a first temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a second temperature difference between the liquid outlet temperature of the refrigerant and the liquid inlet temperature of the refrigerant; 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 defrosting entry condition, the heat exchange efficiency of the outdoor environment and the outdoor heat exchanger under different frosting conditions can be reflected by the temperature difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature; for example, when the air conditioner is not frosted, the outdoor outlet air temperature is slightly lower, so that the difference between the maximum outdoor outlet air temperature and the outdoor outlet air temperature is larger; and under the condition that the air conditioner is frosted, the outdoor air outlet temperature is slightly high, so the difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature is small. Like this, one of the defrosting admission condition of this application is promptly according to the temperature variation of outdoor air-out temperature under the different outdoor operating mode and carries out the defrosting and judge.
In addition, the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature of the outdoor heat exchanger, which are recorded after the air conditioner is started and operated at this time, can reflect the heat absorption efficiency of the refrigerant in the outdoor heat exchanger under different frosting conditions, so that the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature of the outdoor heat exchanger can also be used as parameters for judging the frosting degree of the air conditioner.
Meanwhile, the defrosting entry condition of the air conditioner 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 sub-condition for judging defrosting according to the temperature of the refrigerant inlet and outlet liquid is introduced into the defrosting inlet condition so as to further improve the accuracy of judging defrosting.
Therefore, when such a defrosting entry condition is set, step S101 further includes obtaining a refrigerant inlet temperature and a refrigerant outlet temperature.
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 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 third temperature sensor;
here, the refrigerant inflow pipe is a pipe through which the refrigerant flows into the outdoor heat exchanger when the air conditioner operates in a 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; the temperature difference between the outdoor heat exchanger and the heat exchanger can influence the heat conduction efficiency, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can change the heat conduction rate of the refrigerant flowing from the outdoor heat exchanger shell to the internal pipeline, 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 fourth temperature sensor, and the fourth 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 fourth 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 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.
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 determining that the defrosting entry condition is satisfied according to parameters such as an outdoor outlet air temperature of the outdoor unit and an upper casing temperature of the outdoor heat exchanger, the defrosting operation of the air conditioner includes controlling to heat a refrigerant flowing through a refrigerant inlet pipe of the outdoor heat exchanger of the air conditioner to increase a temperature of the refrigerant flowing into the outdoor heat exchanger.
Optionally, a 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; therefore, in step S102, after it is determined that the defrosting entry condition is satisfied according to the indoor intake air temperature, the indoor coil temperature, and the upper shell temperature, the heating device may be controlled to be turned on; and under the condition that the defrosting entering condition is determined not to be met according to the indoor air inlet temperature, the indoor coil temperature and the upper shell temperature, the off state of the heating device is kept.
In one embodiment, the heating device is an electromagnetic heating device, which heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat 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 is not limited to the above electromagnetic heating device, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution of the present application and are covered by the protection scope of the present application.
In an alternative embodiment, in the step S102, when the refrigerant flowing through the refrigerant inlet pipeline of the outdoor heat exchanger of the air conditioner is controlled to be heated, a refrigerant inlet heating parameter may be determined according to the temperature difference, and then a corresponding heating operation may be performed according to the refrigerant inlet heating parameter. For the refrigerant liquid inlet heating parameters, the temperature difference comprises: a first temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a second temperature difference between the liquid outlet temperature of the refrigerant and the liquid inlet temperature of the refrigerant; the heating parameters include heating rate and/or heating duration of the refrigerant flowing through the refrigerant inlet pipeline.
In the above technical disclosure, the first temperature difference value and the second temperature difference value are respectively used for the judgment of one of the sub-conditions of the defrost 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 first temperature difference and the second 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 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 inlet line according to the temperature difference includes: and acquiring a corresponding first heating rate from the first rate incidence relation according to the first temperature difference so as to heat according to the first heating rate.
Here, the first rate correlation includes a correspondence of one or more first temperature difference values to the first heating rate. An alternative first temperature difference versus first heating rate is shown in table 1, herein, as shown in the following table,
first temperature difference (Unit:. degree. C.) First heating Rate (Unit:. degree. C/min)
a1＜T Upper casing max -T Upper shell ≤a2 v11
a2＜T Upper casing max -T Upper shell ≤a3 v12
a3＜T Upper casing max -T Upper shell v13
TABLE 1
In the first rate correlation, the first heating rate is positively correlated with the first temperature difference. I.e. the larger the first temperature difference, the higher the first heating rate; and the smaller the first temperature difference, the lower the first heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipe in step S102 is performed, a first heating rate corresponding to the first temperature difference may be determined according to the first rate association relationship, and then heating may be performed according to the first heating rate.
Optionally, determining a heating rate of the refrigerant flowing through the refrigerant inlet line according to the temperature difference includes: and acquiring a corresponding second heating rate from the second rate association relation according to the second temperature difference so as to heat according to the second heating rate.
Here, the second rate correlation includes a correspondence of one or more second temperature difference values to the second heating rate. An alternative second temperature difference versus second heating rate is shown in table 2, here, as shown in the following table,
second temperature difference (Unit:. degree. C.) Second heating Rate (Unit:. degree. C/min)
b1＜T Discharging liquid -T Feeding liquid ≤b2 v21
b2＜T Discharging liquid -T Feeding liquid ≤b3 v22
b3＜T Discharging liquid -T Liquid feed v23
TABLE 2
The second rate correlation is such that the second heating rate is negatively correlated with the second temperature difference. I.e. the larger the second temperature difference, the lower the second heating rate; and the smaller the second temperature difference, the higher the second heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipe in step S102 is performed, a second heating rate corresponding to the second temperature difference may be determined according to the second rate association relationship, and then heating may be performed according to the second heating rate.
In the above embodiment, because the frosting degree of the outdoor heat exchanger has different influence ranges on the temperature change of the first temperature difference and the second temperature difference, the first temperature difference and the second temperature difference are respectively provided with a single association relationship, and the air conditioner can select one of the association relationships to determine the corresponding heating rate according to actual needs.
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 reference factors such as the upper shell temperature corresponding to the first temperature difference value, which can reflect the frosting degree, 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, it indicates that the heating demand of the user is high or low.
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 heating time duration may be further obtained from the first time duration correlation according to the first temperature difference, so as to heat according to the first heating time duration.
Here, in the first time period correlation, the first heating time period and the first temperature difference are negatively correlated.
Or acquiring a corresponding second heating time length from the second time length incidence relation according to the second temperature difference value, so as to heat according to the second heating time length.
Here, in the second time period correlation, the second heating time period and the second temperature difference are in negative correlation.
In the above embodiment, the manner of obtaining the first heating duration according to the first temperature difference and obtaining the second heating duration according to the second temperature difference may refer to the control procedure of obtaining the heating rate according to the temperature difference, which is not described herein again.
In other embodiments, the temperature difference for the coolant outlet heating parameter comprises: a first temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a third temperature difference between the temperature of the refrigerant liquid outlet and the temperature of the upper shell; the refrigerant outlet liquid heating parameters comprise heating rate and/or heating duration of the refrigerant flowing through the refrigerant outlet pipeline.
In the above technical context, the first 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 the frosting of the outdoor heat exchanger on the heating performance of the air conditioner can be estimated according to the first temperature difference and the third temperature difference, and the heating rate and the heating duration of the refrigerant flowing through the refrigerant outlet pipeline 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 acquiring a corresponding third heating rate from the third rate incidence relation according to the first temperature difference so as to heat according to the third heating rate.
Here, the third rate correlation includes a correspondence relationship between one or more first temperature difference values and the third heating rate. An alternative first temperature difference versus third heating rate is shown in table 3, here, as shown in the following table,
first temperature difference (Unit:. degree. C.) Third heating Rate (Unit:. degree. C/min)
c1＜T Upper shell max -T Upper shell ≤c2 v31
c2＜T Upper shell max -T Upper shell ≤c3 v32
c3＜T Upper shell max -T Upper shell v33
TABLE 3
In the third rate correlation, the third heating rate is positively correlated with the first temperature difference. I.e. the larger the first temperature difference, the higher the third heating rate; and the smaller the first temperature difference, the lower the third heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant liquid outlet pipeline in step S102 is performed, the third heating rate corresponding to the first 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.
Optionally, determining a heating rate of the refrigerant flowing through the refrigerant liquid outlet pipeline according to the temperature difference includes: and acquiring a corresponding fourth heating rate from the fourth rate incidence relation according to the third temperature difference so as to heat according to the fourth heating rate.
Here, the fourth rate correlation includes a correspondence relationship between one or more third temperature difference values and a fourth heating rate. An alternative third temperature difference versus fourth heating rate is shown in table 4, herein below,
third temperature difference (Unit:. degree. C.) Fourth heating Rate (Unit:. degree. C/min)
d1＜T Discharging liquid -T Upper shell ≤d2 v41
d2＜T Discharging liquid -T Upper shell ≤d3 v42
d3＜T Discharging liquid -T Upper shell v43
TABLE 4
In the fourth rate correlation, the fourth heating rate is negatively correlated with the third temperature difference. I.e., the greater the third temperature difference, the lower the fourth heating rate; and the smaller the third temperature difference, the higher the fourth heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant liquid outlet pipeline in step S102 is performed, the fourth 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 fourth heating rate.
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 third 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 heating rate according to actual needs.
Optionally, the specifically selected rate association relationship may refer to technical contents shown in the foregoing embodiments, which are not described herein again.
Similarly, in some optional embodiments, a corresponding third heating time period may be further obtained from the third time period correlation according to the first temperature difference, so as to heat according to the third heating time period.
Here, in the third time period correlation, the third heating time period is positively correlated with the first temperature difference.
Or acquiring a corresponding fourth heating time length from the fourth time length incidence relation according to the third temperature difference value, so as to heat according to the fourth heating time length.
Here, in the fourth time-length correlation, the fourth heating time length and the third temperature difference value are negatively correlated.
In the above embodiment, the manner of obtaining the heating duration according to the temperature difference may refer to the control procedure of obtaining the 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 outlet air temperature of the outdoor unit and the temperature of the upper casing of the outdoor heat exchanger, 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.
Here, after the air conditioner exits defrosting, the operating 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 exiting defrosting.
In some alternative embodiments, after determining that the defrosting entry condition is satisfied according to the outdoor outlet air temperature of the outdoor unit and the temperature of the upper casing of the outdoor heat exchanger, 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 still other optional embodiments, after determining that the defrosting entry condition is satisfied according to the outdoor outlet air temperature of the outdoor unit and the temperature of the upper casing of the outdoor heat exchanger, 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 outdoor air outlet temperature T of outdoor unit Air outlet And the upper shell temperature T of the outdoor heat exchanger Upper shell ；
S203, detecting the liquid inlet temperature T of the refrigerant Liquid feed And the temperature T of the refrigerant outlet liquid Discharging liquid ；
S204, judging whether T is available max -T Air outlet ≤△T1，T Upper shell max -T Upper shell ≥△T2，T Discharging liquid -T Liquid feed Δ T3, and T Discharging liquid -T Upper shell Δ T4, if yes, executing step S205, if no, returning to execute step S202;
in the disclosed embodiments, T max -T Air outlet ≤△T1，T Upper casing max -T Upper shell ≥△T2，T Discharging liquid -T Feeding liquid Δ T3, and T Discharging liquid -T Upper shell Delta T4 is less than or equal to the preset defrosting entrance condition.
After the air conditioner is started to operate, the temperature sensor detects the temperature of the upper shell in real time, and the detected temperatures of the plurality of upper shells are used as historical data to be stored; therefore, when the determination step of step S203 is executed, a plurality of upper casing temperatures in the history data may be retrieved, and the maximum value T of the upper casing temperature may be determined by comparison Upper casing max ；
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 T Upper casing max -T Upper shell Obtaining a corresponding first heating rate from the first rate correlation, and according to T Upper shell max -T Upper shell From the first time length association relationObtaining a corresponding first heating time length;
s206, according to T Upper shell max -T Upper shell Obtaining a corresponding third heating rate from the third rate correlation, and obtaining the third heating rate according to T Upper shell max -T Upper shell Acquiring a corresponding third 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 heating rate and the first heating time length, and starting a second heating device according to a third heating rate and a third heating time length;
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 a 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 parameters such as the outdoor air outlet temperature of the outdoor unit, the temperature of the upper shell of the outdoor heat exchanger and the like, 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 operating a heating mode of an air conditioner; 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 ambient 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, the defrosting of the outdoor heat exchanger is finished, no frost or only a small amount of frost exists on the outdoor heat exchanger, and 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 so, controlling to stop heating; if not, the current operation working state is maintained, 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 further 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 the 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 nonvolatile 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 liquid outlet pipeline of the outdoor heat exchanger 41 in the heating mode, and configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
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 that, 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 embodiments of the present disclosure 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, provided that 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 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 technical 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 position, or may be distributed on multiple 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 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 (9)

1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
in the process of the air conditioner running heating mode, acquiring the outdoor air outlet temperature of the outdoor unit and the upper shell temperature of the outdoor heat exchanger;
after the condition that defrosting entry is met is determined according to the outdoor air outlet temperature and the temperature of the upper shell, the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner is controlled to be heated;
the defrost entry conditions include:
T max -T air outlet ≤△T1，T Upper casing max -T Upper shell ≥△T2，T Discharging liquid -T Feeding liquid Δ T3, and T Discharging liquid -T Upper shell ≤△T4；
Wherein, T max The maximum value of the outdoor air outlet temperature, T, recorded after the air conditioner is started up and operated at this time Air outlet For the outdoor outlet air temperature, T Upper casing max The maximum value of the temperature of the upper shell, T, of the outdoor heat exchanger recorded after the air conditioner is started up and operated at this time Upper shell Is the upper shell temperature of the outdoor heat exchanger, T Feeding liquid Is the refrigerant inlet temperature of the refrigerant flowing through the refrigerant inlet pipeline, T Discharging liquid For the refrigerant liquid outlet temperature of the refrigerant flowing through the refrigerant liquid outlet pipeline in the heating mode of the outdoor heat exchanger, delta T1 is a preset first temperature difference threshold value, delta T2 is a preset second temperature difference threshold value, delta T3 is a preset third temperature difference threshold value, and delta T4 is a preset fourth temperature difference threshold value;
the refrigerant liquid inlet heating parameters for heating the refrigerant flowing through the refrigerant liquid inlet pipeline are determined according to the temperature difference and the preset incidence relation; the temperature difference includes: a first temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a second temperature difference between the liquid outlet temperature of the refrigerant and the liquid inlet temperature of the refrigerant; 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 one selected from a first rate incidence relation and a second rate incidence relation according to the heating requirement of the current user; the first rate correlation is a corresponding relation between a first temperature difference and a first heating rate, and the second rate correlation is a corresponding relation between a second temperature difference and a second heating rate.
2. The control method according to claim 1, wherein the refrigerant outflow heating parameter for heating the refrigerant flowing through the refrigerant outflow pipeline is determined according to a temperature difference;
for the refrigerant outlet liquid heating parameters, the temperature difference comprises: a first temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a third temperature difference between the temperature of the refrigerant liquid outlet and the temperature of the upper shell;
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 method of claim 2, wherein determining a heating rate of the refrigerant flowing through the refrigerant inlet line based on the temperature difference comprises:
according to the first temperature difference, acquiring a corresponding first heating rate from a first rate incidence relation, and heating according to the first heating rate; or the like, or a combination thereof,
and acquiring a corresponding second heating rate from a second rate association relation according to the second temperature difference so as to heat according to the second heating rate.
4. The control method of claim 2, wherein determining a heating duration for the refrigerant flowing through the refrigerant inlet line based on the temperature difference comprises:
acquiring corresponding first heating time length from a first time length incidence relation according to the first temperature difference value, and heating according to the first heating time length; or,
and acquiring a corresponding second heating time length from a second time length incidence relation according to the second temperature difference so as to heat according to the second heating time length.
5. The method as claimed in claim 2, wherein determining a heating rate of the refrigerant flowing through the refrigerant outflow line according to the temperature difference comprises:
according to the first temperature difference value, acquiring a corresponding third heating rate from a third rate incidence relation so as to heat according to the third heating rate; or,
and acquiring a corresponding fourth heating rate from a fourth rate incidence relation according to the third temperature difference so as to heat according to the fourth 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:
acquiring a corresponding third heating time length from a third time length incidence relation according to the first temperature difference value, and heating according to the third heating time length; or,
and acquiring a corresponding fourth heating time length from a fourth time length incidence relation according to the third temperature difference so as to heat according to the fourth heating time length.
7. The control method according to any one of claims 1 to 6, further comprising, after determining that a defrosting entry condition is satisfied according to the outdoor air-out temperature and the upper casing temperature:
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,
and controlling to increase the flow opening of a throttling device of the air conditioner.
8. A control apparatus 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 7 when executing the program instructions.
9. 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;
a control apparatus for defrosting an air conditioner in accordance with claim 8, which is electrically connected to said first heating means and said second heating means, respectively.
CN201910675264.XA 2019-07-25 2019-07-25 Control method and device for defrosting of air conditioner and air conditioner Active CN110469969B (en)

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