CN110469987B - 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
CN110469987B
CN110469987B CN201910683246.6A CN201910683246A CN110469987B CN 110469987 B CN110469987 B CN 110469987B CN 201910683246 A CN201910683246 A CN 201910683246A CN 110469987 B CN110469987 B CN 110469987B
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temperature
heating
air conditioner
refrigerant
heat exchanger
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CN110469987A (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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • 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

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, the refrigerant outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell are obtained; after the condition of entering the defrosting mode is determined to be met according to the refrigerant liquid outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the reverse circulation defrosting mode is controlled to enter and a first heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger is executed. The control method judges whether the air conditioner meets defrosting entry conditions according to the refrigerant outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, and improves the control precision of controlling the defrosting of the air conditioner; and the adverse effect of frost condensation on the performance of the air conditioner is accelerated and reduced by a reverse circulation defrosting mode and a mode of heating the refrigerant flowing through 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 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 defrosting of the outdoor heat exchanger is mainly performed in the following ways: firstly, reverse cycle defrosting is carried out, when the air conditioner carries out reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; secondly, an electric heating device is added on a refrigerant pipeline of the air conditioner, the electric heating device is used for heating the refrigerant flowing into the outdoor heat exchanger, and then the heat of the refrigerant is used for melting the frost condensed on the outdoor heat exchanger; and thirdly, adjusting the operation parameters of the air-conditioning components such as the compressor, the electronic expansion valve and the like to change the temperature and the pressure state of the refrigerant in the refrigerant pipeline, so that the refrigerant pipeline can also have the function of defrosting the outdoor heat exchanger.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
because the defrosting 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; 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 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:
acquiring the refrigerant outlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell in the process of the air conditioner running heating mode;
after the condition of entering the defrosting mode is determined to be met according to the refrigerant liquid outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the reverse circulation defrosting mode is controlled to enter and a first heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner is executed.
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 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 the air conditioner, as described in some embodiments above, is electrically connected to the heating device.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve 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 parameters of the refrigerant outlet liquid temperature, the outdoor coil temperature and the upper shell temperature of the outdoor heat exchanger, so that the control precision of controlling the defrosting of the air conditioner can be effectively improved; and the high-temperature refrigerant is utilized to defrost the outdoor heat exchanger in the reverse circulation defrosting mode, and the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse circulation mode is further improved in a mode of heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated and reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart 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 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 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, in the process of an air conditioner running heating mode, obtaining the refrigerant liquid outlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell;
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, the outdoor unit of the air conditioner is further provided with a first temperature sensor, and the first 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 outlet temperature obtained in step S101 may be the real-time temperature of the coolant detected by the first 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 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.
In an optional embodiment, a second temperature sensor is arranged at the coil position of an outdoor heat exchanger of the outdoor unit of the air conditioner, and the second temperature sensor can be used for detecting the real-time temperature of the coil position of the second temperature sensor; thus, the first outdoor coil temperature acquired in step S101 may be the real-time temperature of the coil position detected by the second 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 first outdoor coil can be used as a reference factor for measuring the frosting influence of the interior and the exterior of the air conditioner on the outdoor heat exchanger.
In an alternative 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 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 third 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 case 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.
S102, after the condition that the defrosting entry condition is met is determined according to the refrigerant liquid outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the air conditioner is controlled to enter a reverse circulation defrosting mode and to execute a first heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
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 refrigerant liquid inlet temperature, the outdoor coil temperature, and the temperature of the upper shell of the outdoor heat exchanger, which are obtained in step S101; therefore, the embodiment of the disclosure integrates the three 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:
T1-Te≥△T1，Tupper casing max-TUpper shellNot less than DELTA T2 and T2-TDischarging liquid≥△T3；
Wherein, T isDischarging liquidThe refrigerant outlet temperature T of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger in the heating modeeIs the outdoor coil temperature, T1 is the initial outdoor coil temperature at start-up of the air conditioner, TUpper casing maxThe 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 timeUpper shellThe temperature of the upper shell of the outdoor heat exchanger is T2, the initial refrigerant outlet temperature when the air conditioner is started, a delta T1 is a preset first temperature difference threshold value, a delta T2 is a preset second temperature difference threshold value, and a delta T3 is a preset third temperature difference threshold value.
In the defrosting entering condition, the temperature difference between the outdoor coil temperature and the initial outdoor coil temperature can reflect the change condition of the temperature of the outdoor coil 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 in normal operation, the variation of the outdoor coil temperature compared with the initial outdoor coil temperature is limited; 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 variation of the outdoor coil pipe temperature is larger than that of the original outdoor coil pipe temperature; therefore, one of the defrosting entry conditions is to judge defrosting according to the temperature of the outdoor coil under different outdoor working conditions.
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.
T2 is the initial refrigerant outlet temperature when the air conditioner is turned on. When the air conditioner starts to operate, the frosting problem generally does not exist, so the detected refrigerant outlet temperature can reflect the refrigerant temperature state when the air conditioner normally absorbs heat from the outdoor environment under the condition of no frosting; furthermore, the size of the temperature difference between the initial refrigerant liquid outlet temperature and the refrigerant liquid outlet temperature can indicate the influence of different frosting degrees of the air conditioner on the heat absorption efficiency of the refrigerant flowing through the outdoor 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 it is determined that the defrosting entry condition is satisfied according to the refrigerant outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil, and the temperature of the upper shell, the defrosting operation of the air conditioner includes controlling to enter a reverse cycle defrosting mode and performing a first heating operation on a refrigerant flowing through a refrigerant outlet pipe of the outdoor heat exchanger of the air conditioner.
The reverse circulation defrosting mode comprises the step of controlling the flow direction of a refrigerant of the air conditioner to be switched to the flow direction opposite to the heating mode; in the mode flow, the high-temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger, so that the defrosting operation of the outdoor heat exchanger can be realized by utilizing the heat of the high-temperature refrigerant.
Meanwhile, in the reverse circulation mode, the refrigerant liquid outlet pipeline in the heating mode is substantially changed into a refrigerant liquid inlet pipeline, namely, the refrigerant flows into the outdoor heat exchanger through the refrigerant liquid outlet pipeline in the refrigeration mode at the moment; therefore, the temperature of the refrigerant flowing into the indoor heat exchanger can be further increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the actual defrosting effect can be enhanced.
Optionally, a heating device is disposed at a refrigerant liquid outlet pipeline of the outdoor heat exchanger, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid outlet pipeline.
Therefore, in step S102, after it is determined that the defrosting entry condition is satisfied according to the refrigerant outlet temperature of the outdoor heat exchanger, the outdoor coil temperature, and the upper shell temperature, the reverse cycle defrosting mode may be controlled to operate and the heating device may be turned on to perform the first heating operation; and under the condition that the defrosting entering condition is not met according to the refrigerant outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, keeping the heating mode unchanged and keeping the closing state of the heating device.
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 first heating operation on the refrigerant liquid outlet line is controlled, the heating operation of the first heating operation may be determined according to the temperature difference, and then the first heating operation may be performed according to the heating operation.
Wherein the temperature difference comprises: a first temperature difference between the initial refrigerant liquid outlet temperature and the refrigerant liquid outlet temperature, or a second temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell; the heating parameters include a heating rate and/or a heating period of the first heating operation.
In the above technical context, the first temperature difference and the second temperature difference are also one of the sub-conditions of the above-described defrost entry condition; 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 second 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 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 one or more first temperature difference values and first heating rates. 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＜T2-TDischarging liquid≤a2 v11
a2＜T2-TDischarging liquid≤a3 v12
a3＜T2-TDischarging liquid 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 outlet pipeline 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 liquid outlet pipeline 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 first 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＜TUpper shell max-TUpper shell≤b2 v21
b2＜TUpper casing max-TUpper shell≤b3 v22
b3＜TUpper shell max-TUpper shell v23
TABLE 2
In the second rate correlation, the first heating rate is positively correlated with the second temperature difference. I.e., the greater the second temperature difference, the higher the second heating rate; and the smaller the second temperature difference, the lower the second heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant liquid outlet pipeline in step S102 is performed, the 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, since the degree of frosting of the outdoor heat exchanger has different influences on the thermal performance of the air conditioner, and further has different influences on the temperature change of the first temperature difference and the second temperature difference, the air conditioner is respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships to determine the corresponding 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 second rate association relationship is selected, and at this time, the influence of the upper casing temperature corresponding to the second temperature difference value on the defrosting effect is mainly considered; and when the heating demand of the current user is higher, the first rate incidence relation is selected, and at the moment, the influence of the frosting of the outdoor heat exchanger on the temperature of the refrigerant flowing in the refrigerant circulation loop is mainly considered, so that the return 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 considered 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 determining the heating time period of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature difference may further include: and acquiring a corresponding first heating time length from the first time length incidence relation according to the first temperature difference so as to heat according to the first heating time length.
Here, in the first time-length correlation, the first heating time length is positively correlated with the first temperature difference.
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 is positively correlated with the second temperature difference.
In the above embodiment, the manner of obtaining the heating time duration according to the temperature difference may refer to the aforementioned control flow of obtaining the heating rate according to the temperature difference, which is not described herein again.
In some optional embodiments, in order to improve the heating performance of the air conditioner as soon as possible when the air conditioner is turned on, the control method of the present application further includes: and after the air conditioner is started in a heating mode, controlling to execute second heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
At this time, the refrigerant flows out of the outdoor heat exchanger through the refrigerant liquid outlet pipe and flows back to the compressor, so that the second heating operation can improve the return air temperature of the refrigerant flowing back to the compressor, and the heating performance of the air conditioner at the starting-up stage is improved.
Optionally, after controlling to perform the second heating operation, the method further includes: acquiring the return air temperature of a compressor of an air conditioner; and when the return air temperature of the compressor meets the preset temperature rise condition, controlling to stop the second heating operation.
In this embodiment, the air return end of the air conditioner compressor is further provided with a temperature sensor, and the temperature sensor can be used for detecting the temperature of the refrigerant flowing through the air return end; therefore, the temperature of the refrigerant detected in real time can be acquired through the temperature sensor and is used as the return air temperature for judging the temperature rise condition.
In an alternative embodiment, the temperature increase condition comprises: the return air temperature is greater than or equal to a preset return air temperature threshold value.
Here, when the return air temperature is greater than or equal to the preset return air temperature threshold, the heating performance of the air conditioner at that time is described so as to be able to meet the current heating demand, and the second heating operation may be controlled to stop, so that the power consumption of the second heating operation may be reduced while the heating demand of the air conditioner is ensured; and under the condition that the return air temperature is lower than the preset return air temperature threshold, the heating performance of the air conditioner does not meet the current heating requirement, so that the second heating operation is kept unchanged.
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 be the current mode for starting up operation under the condition of low temperature and severe cold weather.
S202, controlling to start a second heating operation of the heating device;
in an embodiment of the disclosure, the heating device is disposed on the refrigerant outlet pipe of the outdoor heat exchanger in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipe.
Optionally, the air conditioner presets configuration information such as a heating rate of the second heating operation, so in step S202, the air conditioner may call the preset configuration information and control to execute the second heating operation according to the configuration information;
s203, acquiring the return air temperature of the compressor;
s204, judging whether T is availableReturn air≥TThreshold value of return airIf yes, executing step S205, if no, returning to execute step S203;
s205, stopping executing the second heating operation;
s206, detecting the temperature T of the refrigerant outlet liquidDischarging liquidOutdoor coil temperature TeAnd the upper shell temperature T of the outdoor heat exchangerUpper shell；
S207, judging whether T1-Te≥△T1，TUpper shell max-TUpper shellNot less than DELTA T2 and T2-TDischarging liquidΔ T3, if yes, executing step S208, if no, returning to execute step S206;
in the disclosed embodiment, T1-Te≥△T1，TUpper casing max-TUpper shellNot less than Δ T2 and T2-TDischarging liquidΔ T3 together constitute a predetermined defrost entry 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, in executing the determination step of step S207, 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 comparisonUpper shell 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.
S208, according to T2-TDischarging liquidAcquiring a corresponding first heating rate from the first rate association relation;
s209, according to T2-TDischarging liquidAcquiring a corresponding first heating time length from the first time length incidence relation;
s210, controlling to enter a reverse cycle defrosting mode, and starting a heating device according to a first heating rate and a first heating duration;
optionally, the heating device is an electromagnetic heating device, and thus the adjustment of the first heating rate may be achieved by changing parameters such as operating current or voltage of the electromagnetic heating device.
The control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired parameters of the refrigerant outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil pipe, the temperature of the upper shell and the like, so that the control precision of controlling the defrosting of the air conditioner can be effectively improved; the high-temperature refrigerant is utilized to defrost the outdoor heat exchanger in the reverse circulation defrosting mode, the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse circulation mode is further increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated to be reduced.
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 of an air conditioner, which is structurally 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 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 heating device 45 is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 41 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
and a control device 46 for defrosting the air conditioner, which is electrically connected with the heating device 45. Here, the control device for defrosting of the air conditioner 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 the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the 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, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units 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 (7)

1. A control method for defrosting an air conditioner is characterized by comprising the following steps:
acquiring the refrigerant outlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell in the process of the air conditioner running heating mode;
after the condition of meeting the defrosting entry condition is determined according to the refrigerant liquid outlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner;
wherein the defrost entry conditions include:
T1-Te≥△T1，Tupper casing max-TUpper shellNot less than DELTA T2 and T2-TDischarging liquid≥△T3；
Said T isDischarging liquidThe temperature T of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger in the heating modeeT1 is the initial outdoor coil temperature when the air conditioner is turned on, TUpper casing maxIs a stand forThe 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 timeUpper shellThe temperature of an upper shell of the outdoor heat exchanger is T2, the initial refrigerant outlet temperature when the air conditioner is started is T1, a first preset temperature difference threshold value is delta T2, a second preset temperature difference threshold value is delta T3, and a third preset temperature difference threshold value is delta T3;
the heating parameters of the first heating operation are determined according to the temperature difference; wherein the temperature difference comprises: a first temperature difference between the initial refrigerant liquid outlet temperature and the refrigerant liquid outlet temperature, or a second temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell; the heating parameters comprise a heating rate and/or a heating time period of the first heating operation;
determining the heating rate of the first heating operation from the temperature difference, comprising: acquiring a corresponding first heating rate from a first rate incidence relation according to the first temperature difference so as to execute a first heating operation according to the first heating rate; or acquiring a corresponding second heating rate from a second rate association relation according to the second temperature difference value, so as to execute a first heating operation according to the second heating rate; determining a rate association relation according to the heating demand of the current user, wherein the rate association relation comprises the following steps: when the heating demand of the current user is low, selecting a first rate association relation; and when the heating demand of the current user is higher, selecting a second rate relation.
2. The control method according to claim 1, wherein determining the heating time period of the first heating operation according to the temperature difference value includes:
acquiring a corresponding first heating time length from a first time length incidence relation according to the first temperature difference value, and executing a first heating operation according to the first heating time length; or the like, or, alternatively,
and acquiring a corresponding second heating time length from a second time length incidence relation according to the second temperature difference value, so as to execute a first heating operation according to the second heating time length.
3. The control method according to claim 1, wherein the heating parameter of the first heating operation is positively correlated with the first temperature difference;
the heating parameter of the first heating operation is positively correlated with the second temperature difference.
4. The control method according to any one of claims 1 to 3, characterized by further comprising:
and after the air conditioner is started in a heating mode, controlling to execute second heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
5. The control method according to claim 4, further comprising, after controlling to perform the second heating operation:
acquiring the return air temperature of a compressor of the air conditioner;
when the return air temperature of the compressor meets a preset temperature rise condition, controlling to stop the second heating operation;
wherein the temperature rise condition comprises: the return air temperature is greater than or equal to a preset return air temperature threshold value.
6. 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 5 when executing the program instructions.
7. An air conditioner, comprising:
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 heating device is arranged on a refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid outlet pipeline;
a control apparatus for defrosting an air conditioner in accordance with claim 6, electrically connected to said heating means.
CN201910683246.6A 2019-07-26 2019-07-26 Control method and device for defrosting of air conditioner and air conditioner Active CN110469987B (en)

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