CN110469972B - 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
CN110469972B
CN110469972B CN201910675286.6A CN201910675286A CN110469972B CN 110469972 B CN110469972 B CN 110469972B CN 201910675286 A CN201910675286 A CN 201910675286A CN 110469972 B CN110469972 B CN 110469972B
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heating
temperature
refrigerant
air conditioner
heat exchanger
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CN110469972A (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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/34—Heater, e.g. gas burner, electric air heater

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 liquid inlet 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 meeting the defrosting entry condition is determined according to the refrigerant liquid inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger is controlled to be heated. The control method can judge whether the air conditioner meets the defrosting entry condition according to the refrigerant liquid inlet 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 heating performance of the air conditioner is reduced by heating the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.

Description

Control method and device for defrosting of air conditioner and air conditioner
Technical Field
The application relates to the technical field of air conditioner defrosting, for example, 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 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; 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 defrosting of an air conditioner and the air conditioner, and aims to solve the technical problem that the defrosting of the air conditioner is low in judgment accuracy in the related art.
In some embodiments, the control method for defrosting an air conditioner includes:
acquiring the liquid inlet temperature of a refrigerant 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;
and after the condition of meeting the defrosting entry condition is determined according to the refrigerant liquid inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil 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 circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the first heating device is arranged on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting an air conditioner according to some embodiments of the present invention 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 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 refrigerant liquid inlet temperature of the outdoor heat exchanger, the outdoor coil temperature and the upper shell temperature, so that the control precision for controlling the air conditioner to defrost 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 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 inlet 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 inlet pipeline of the outdoor heat exchanger; therefore, the liquid inlet temperature of the refrigerant obtained in step S101 may be a real-time temperature of the refrigerant detected by the first 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 present disclosure, the flow sequence of the refrigerant discharged from the compressor in the refrigerant circulation loop in the heating mode is: the air flows through the indoor heat exchanger, then flows through the throttling device for throttling, then flows into the outdoor heat exchanger, and finally flows back to the compressor. Before the refrigerant flows into the outdoor heat exchanger, the temperature of the refrigerant is gradually reduced under the combined influence of the heat exchange process of the indoor heat exchanger and the throttling action of the throttling device; under different outdoor working conditions, the temperature of the refrigerant flowing into the outdoor heat exchanger is obviously different; for example, when the air conditioner has a frosting problem, the temperature of the refrigerant discharged by the compressor is lower than that of the refrigerant without frosting, meanwhile, the indoor environment is influenced by the outdoor severe environment, and the heat released by the refrigerant after flowing through the indoor heat exchanger is more, so that the temperature of the refrigerant finally flowing into the outdoor heat exchanger is a relatively low value, and the refrigerant inlet temperature reflects the frosting condition of the air conditioner from the side.
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 can visually reflect the temperature change condition of the refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor environment temperature and the internal refrigerant temperature, and is also a pipeline part of the outdoor heat exchanger, which is easy to cause the 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 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 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.
And S102, after the condition that the defrosting entry condition is met is determined according to the refrigerant liquid inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil 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 three parameters of the refrigerant liquid inlet temperature, the outdoor coil temperature, and the upper shell temperature 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-T liquid feed ≥△T1，T2-T e ≥△T2，T Upper casing max -T Upper shell ≥△T3，
And T3-T Discharging liquid ≥△T4；
Wherein, T Feeding liquid Is the refrigerant inlet temperature, T, of the refrigerant flowing through the refrigerant inlet pipeline Discharging liquid For the refrigerant liquid outlet temperature, T, of the refrigerant flowing through the refrigerant liquid outlet pipeline in the heating mode of the outdoor heat exchanger e Is the temperature of the outdoor coil, T1 is the initial refrigerant inlet temperature when the air conditioner is started, T2 is the initial outdoor coil temperature when the air conditioner is started, T3 is the initial refrigerant outlet temperature when the air conditioner is started, 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 The temperature of an upper shell of the outdoor heat exchanger is shown as delta T1, delta T2, delta T3 and delta T4, wherein the delta T1 is a preset first temperature difference threshold value, the delta T2 is a preset second temperature difference threshold value, the delta T3 is a preset third temperature difference threshold value, and the delta T4 is a preset fourth temperature difference threshold value.
In the defrosting entry condition, T1 is the initial refrigerant inlet temperature when the air conditioner is started. When the air conditioner starts to operate, the frosting problem generally does not exist, so the detected liquid inlet temperature of the refrigerant can reflect the temperature state of the refrigerant when the air conditioner normally works under the condition of no frosting; furthermore, the size of the temperature difference between the initial refrigerant liquid inlet temperature and the refrigerant liquid inlet temperature can indicate the influence of different frosting degrees of the air conditioner on the temperature of the refrigerant in the refrigerant circulation loop. Similarly, the size of the temperature difference between the initial refrigerant outlet temperature instrument and the refrigerant outlet temperature can indicate the influence of different frosting degrees of the air conditioner on the heat absorption efficiency of the refrigerant after flowing through the outdoor heat exchanger.
The temperature difference between the temperature of the outdoor coil and the initial temperature of the outdoor coil can reflect the change condition of the temperature of the outdoor coil under the joint 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 for heating, 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 is easy to cause the frost condensation of the outdoor heat exchanger, the temperature of the outdoor coil is quickly reduced under the influence of the temperature change of the outdoor environment, so that the variation of the outdoor coil temperature is larger than the variation of the initial outdoor coil temperature; thus, one of the defrosting entry conditions of the defrosting device 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.
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, 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 it is determined that the defrosting entry condition is satisfied according to the refrigerant liquid inlet 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 heat the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner so as to increase the 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 refrigerant liquid inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the heating device can be controlled to be turned on; and under the condition that the defrosting entry condition is not met according to the refrigerant liquid inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the heating device is kept in a closed state.
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 enable eddy currents to be generated inside the refrigerant pipe section, so that the effect of heating and warming can be achieved by means of 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 optional 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 liquid heating parameter may be determined according to the temperature difference, and then a corresponding heating operation may be performed according to the refrigerant inlet liquid heating parameter.
The temperature difference value of the refrigerant inlet liquid heating parameter comprises: a first temperature difference between the initial refrigerant feed liquid temperature and the refrigerant feed liquid temperature, or a second temperature difference between the maximum upper shell temperature and the upper shell temperature; the refrigerant liquid inlet heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid inlet pipeline.
In the above technical disclosure, the 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 pipe 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＜T1-T Feeding liquid ≤a2 v11
a2＜T1-T Feeding liquid ≤a3 v12
a3＜T1-T Liquid feed 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 incidence 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, herein, as shown in the following table,
second temperature difference (Unit:. Degree. C.) Second heating Rate (Unit:. Degree. C/min)
b1＜T Upper casing max -T Upper shell ≤b2 v21
b2＜T Upper casing max -T Upper shell ≤b3 v22
b3＜T Upper shell max -T Upper shell v23
TABLE 2
In the second rate correlation, the second 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 inlet pipe in step S102 is performed, the second heating rate corresponding to the second temperature difference may be determined according to the second rate correlation, and then the heating operation may be performed according to the second heating rate.
In the above embodiment, because the degree of frosting of the outdoor heat exchanger has different influence ranges on the temperature change of the upper shell and the change of the refrigerant inlet temperature, the outdoor heat exchanger is respectively provided with an independent incidence relation, and the air conditioner can select one of the incidence relations 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 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 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 period correlation, the first heating time period 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 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 other embodiments, the temperature difference for the coolant outlet heating parameter comprises: a second temperature difference between the maximum temperature of the upper shell and the temperature of the upper shell, or a third temperature difference between the initial refrigerant liquid outlet temperature and the refrigerant liquid outlet temperature; 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 second temperature difference and the third temperature difference are also one of the sub-conditions of the defrost entry condition in the foregoing; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the influence of the frosting of the outdoor heat exchanger on the heating performance of the air conditioner can be estimated according to the second temperature difference and the third temperature difference, and the heating rate and the heating duration of the refrigerant flowing through the refrigerant outlet 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 seriously frosted; 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 second 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 second temperature difference values and the third heating rate. An alternative second temperature difference versus third heating rate is shown in table 3, herein, as shown in the following table,
second 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 casing max -T Upper shell ≤c3 v32
c3＜T Upper casing max -T Upper shell v33
TABLE 3
In the third rate correlation, the third heating rate is positively correlated with the second temperature difference. I.e. the larger the second temperature difference, the higher the third heating rate; and the smaller the second 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 second temperature difference may be determined according to the third rate association relationship, and then the heating operation may be performed according to the third heating rate.
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 second 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＜T3-T Discharging liquid ≤d2 v31
d2＜T3-T Discharging liquid ≤d3 v32
d3＜T3-T Discharging liquid v33
TABLE 4
In the fourth rate correlation, the third heating rate is positively correlated with the third temperature difference. That is, the larger the third temperature difference is, the higher the fourth heating rate is; and the smaller the third temperature difference, the lower 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 second 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 also be obtained from the third time period correlation according to the second temperature difference, so as to heat according to the third heating time period.
Here, in the third time period correlation, the second temperature difference value is positively correlated with the third heating time period.
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 third temperature difference value is positively correlated with the fourth heating time period.
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, after determining that the defrosting entry condition is satisfied according to the refrigerant inlet temperature of the outdoor heat exchanger, the outdoor coil temperature and the upper shell temperature, the method further includes: the control reduces the operating frequency of the compressor of the air conditioner.
In an embodiment, by reducing the operating frequency of the compressor of the air conditioner, the heat absorption rate of the refrigerant in the outdoor heat exchanger can be reduced, and then adverse effects of further temperature reduction and increased frosting degree of the outdoor heat exchanger caused by heat absorption of the refrigerant can be weakened, so that the defrosting effect of the air conditioner in defrosting operation of heating the refrigerant in the refrigerant liquid inlet pipeline and the refrigerant in the refrigerant liquid outlet pipeline is improved.
After the air conditioner exits defrosting, the running frequency of the air conditioner compressor can be controlled to be recovered so as to meet the frequency requirement of normal heating operation of the air conditioner after the air conditioner exits defrosting.
In some alternative embodiments, after determining that the defrosting entry condition is satisfied according to the refrigerant inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil, and the temperature of the upper shell, the method further includes: controlling to reduce the rotating speed of an outdoor fan of the air conditioner or shutting down the outdoor fan, and/or controlling to reduce the rotating speed of an indoor fan of the air conditioner.
In the embodiment, the rotating speed of the indoor fan of the air conditioner is reduced, so that the heat exchange rate between the indoor heat exchanger and the indoor environment can be reduced, more heat can be reserved for the refrigerant flowing into the outdoor heat exchanger after the indoor heat exchanger flows out, the defrosting effect of the outdoor heat exchanger by using the heat of the refrigerant can be improved, and the running power consumption of the heating device for heating the refrigerant can also be reduced.
Meanwhile, by shutting down the outdoor fan, the heat exchange rate between the outdoor heat exchanger and the outdoor environment can be reduced, the adverse temperature influence of the low-temperature condition of the outdoor environment on frosting of the outdoor heat exchanger is reduced, and the heat dissipation of the refrigerant heat for defrosting is reduced, so that the actual defrosting effect in the defrosting process is ensured.
In some alternative embodiments, after determining that the defrosting entry condition is satisfied according to the refrigerant inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil and the temperature of the upper shell, the method further includes: controlling and increasing the flow opening of the throttling device of the air conditioner.
In an embodiment, the flow opening degree 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 better defrosting effect.
Fig. 2 is a flowchart illustrating a control method for defrosting an air conditioner according to another embodiment of the present disclosure.
As shown in fig. 2, the embodiment of the present disclosure provides another control method for defrosting an air conditioner, and the control steps mainly include:
s201, starting an air conditioner and operating in a heating mode;
in this embodiment, a general user of the air conditioner sets the heating mode to the current mode to start the air conditioner in a low-temperature and severe-cold weather condition.
S202, detecting the refrigerant inlet liquid temperature T of the outdoor heat exchanger Feeding liquid Outdoor coil temperature T e And the upper shell temperature T of the outdoor heat exchanger Upper shell ；
S203, detecting the temperature T of the refrigerant outlet liquid Discharging liquid ；
S204, judging whether T1-T exists or not Feeding liquid ≥△T1，T2-T e ≥△T2，T Upper shell max -T Upper shell Not less than T3 and T3-T Discharging liquid ≧ Δ T4, if yes, execute step S205, if no, return to execute step S202;
in the disclosed embodiments, T1-T Liquid feed ≥△T1，T2-T e ≥△T2，T Upper casing max -T Upper shell Not less than Δ T3, and T3-T Discharging liquid Not less than Δ T4, and T Discharging liquid -T Upper shell And the delta T5 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 performed, a plurality of pieces of history data can be retrievedThe temperature of the upper shell is determined by comparison, and the maximum value T of the temperature of the upper shell is determined by comparison Upper 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.
S205, according to T1-T Liquid feed Obtaining a corresponding first heating rate from the first rate correlation, and according to T1-T Liquid feed Acquiring a corresponding first heating time length from the first time length incidence relation;
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 casing 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 of the refrigerant liquid inlet temperature of the outdoor heat exchanger, the outdoor coil temperature, the upper shell temperature and the like, so that the control precision of controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant inlet pipe way and refrigerant outlet pipe way, can enough effectively improve the refrigerant temperature of inflow outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost of condensing on the outdoor heat exchanger, also can improve the refrigerant temperature who flows back to the compressor to promote heating efficiency, reduce the adverse effect of frost condensation to air conditioner self heating performance.
In some optional embodiments, after controlling to heat the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline, the method further includes: acquiring state parameters in the process of an air conditioner running heating mode; and after the defrosting exit condition is determined to be met according to the state parameters, controlling to stop heating.
Here, the state parameters during the air conditioner operation heating mode are at least one or more of the following parameter types: outdoor environment temperature, refrigerant inlet temperature, refrigerant outlet temperature and outdoor coil temperature. It should be understood that the status parameters obtained in the present application are not limited to the types of parameters shown in the above embodiments.
Correspondingly, the defrosting exit condition is preset according to the specifically obtained parameter type, generally, when the air conditioner meets the defrosting exit condition, 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 unchanged, and the heating of the refrigerant liquid inlet pipeline is still kept.
In the embodiment of the disclosure, in the process of respectively heating the refrigerants flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline, the air conditioner performs the judgment operation on the defrosting exit condition in real time according to the parameters of the air conditioner, so as to stop the heating operation on the refrigerants under the condition that the defrosting exit condition is met, thereby effectively reducing the power consumption for operating the two heating devices.
Fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting 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 (Commun I cat I on I 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 outlet pipe of the outdoor heat exchanger 41 in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipe;
the control device 46 for defrosting the air conditioner is electrically connected to the first heating device 451 and the second heating device 452, respectively. Here, the control device for defrosting of the air conditioner is the control device shown in the foregoing embodiment.
The air conditioner in this disclosed embodiment, whether detection judgement air conditioner that can be accurate has the problem of frosting to and under the condition that the problem of frosting exists in the air conditioner, utilize foretell controlling means and heating device to carry out corresponding defrosting operation, with the frost volume that condenses on the outdoor heat exchanger of reduction air conditioner, guarantee that the air conditioner can normally heat indoor environment under the low temperature severe cold climate condition, promote user's use and experience.
Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.
Embodiments of the present disclosure also provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for defrosting an air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling 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 according to the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same 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 a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (7)

1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
acquiring the refrigerant inlet 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 inlet temperature of the outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell, controlling the heating of the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner;
the defrost entry conditions include:
T1-T liquid feed ≥△T1，T2-T e ≥△T2，T Upper shell max -T Upper shell ≥△T3，
And T3-T Discharging liquid ≥△T4；
Wherein, the T is Liquid feed Is the inlet temperature of the refrigerant flowing through the inlet pipeline of the refrigerant, T Discharging liquid The T is the refrigerant liquid outlet temperature of the refrigerant liquid outlet pipeline flowing through the outdoor heat exchanger in the heating mode e The temperature of the outdoor coil, T1 is the initial refrigerant inlet temperature when the air conditioner is started, T2 is the initial outdoor coil temperature when the air conditioner is started, T3 is the initial refrigerant outlet temperature when the air conditioner is started, and 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 Regarding the temperature of an upper shell 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/or the presence of a gas in the gas,
the refrigerant outlet liquid heating parameters for heating the refrigerant flowing through the refrigerant outlet pipeline are determined according to the temperature difference;
for the refrigerant feed liquid heating parameter, the temperature difference comprises: a first temperature difference between the initial refrigerant feed temperature and the refrigerant feed temperature, or a second temperature difference between the maximum upper shell temperature and the upper shell temperature;
the refrigerant liquid inlet heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid inlet pipeline;
for the refrigerant outlet liquid heating parameters, the temperature difference comprises: a second temperature difference between the maximum upper shell temperature and the upper shell temperature, or a third temperature difference between the initial refrigerant liquid outlet temperature and the refrigerant liquid outlet temperature;
the refrigerant liquid outlet heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid outlet pipeline;
determining the heating rate of the refrigerant flowing through the refrigerant liquid inlet pipeline according to the temperature difference, comprising the following steps of:
acquiring a corresponding first heating rate from a first rate incidence relation according to the first temperature difference so as to heat according to the first heating rate; or the like, or, alternatively,
according to the second temperature difference, acquiring a corresponding second heating rate from a second rate incidence relation, and heating according to the second heating rate;
the heating rate for heating the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner is determined according to the heating requirement of a user;
the method for determining the rate association relationship according to the heating demand of the current user comprises the following steps: when the heating demand of the current user is low, selecting a second rate incidence relation; and when the heating requirement of the current user is higher, selecting a first rate incidence relation, wherein the heating requirement of the current user is determined by the target heating temperature set by the air conditioner.
2. The method of claim 1, wherein determining a heating duration for a refrigerant flowing through the refrigerant inlet line based on the temperature difference comprises:
acquiring a 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 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 so as to heat according to the second heating time length.
3. The method of claim 1, wherein determining a heating rate of the refrigerant flowing through the refrigerant outlet line based on the temperature difference comprises:
acquiring a corresponding third heating rate from a third rate incidence relation according to the second temperature difference value, and heating according to the third heating rate; or the like, or a combination thereof,
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.
4. The control method of claim 1, 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 second temperature difference value, and heating according to the third heating time length; or the like, or, alternatively,
and acquiring a corresponding fourth heating time length from a fourth time length incidence relation according to the third temperature difference value, so as to heat according to the fourth heating time length.
5. The control method according to any one of claims 1 to 4, after determining that the defrosting entry condition is satisfied according to the refrigerant inlet temperature of the outdoor heat exchanger, the temperature of the outdoor coil, and the temperature of the upper shell, further comprising:
controlling to reduce an operating frequency of a compressor of the air conditioner; alternatively, the first and second liquid crystal display panels may be,
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; alternatively, the first and second liquid crystal display panels may be,
and controlling to increase the flow opening of a throttling device of the air conditioner.
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 circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the first heating device is arranged on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting an air conditioner according to claim 6, which is electrically connected to the first heating device and the second heating device, respectively.
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