CN110469965B - 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
CN110469965B
CN110469965B CN201910672132.1A CN201910672132A CN110469965B CN 110469965 B CN110469965 B CN 110469965B CN 201910672132 A CN201910672132 A CN 201910672132A CN 110469965 B CN110469965 B CN 110469965B
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China
Prior art keywords
refrigerant
temperature
heating
air conditioner
outdoor
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CN110469965A (en
Inventor
许文明
王飞
于文文
张心怡
丁爽
李阳
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures

Abstract

The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: acquiring the outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature of an outdoor unit 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 outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet pipeline of the outdoor heat exchanger of the air conditioner to be heated. The control method provided by the embodiment of the disclosure can judge whether the air conditioner meets the defrosting entry condition according to the outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature, so that the control precision of controlling the defrosting of the air conditioner is effectively improved; and the frost condensed on the outdoor heat exchanger is melted by the heat of the refrigerant through the heating operation of the refrigerant flowing through the refrigerant liquid inlet 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 affected by the temperature and the humidity of the outdoor environment, more frost is easily condensed on the outdoor heat exchanger, and the heating capacity of the air conditioner is lower and lower when the frost is condensed to a certain thickness, so that the outdoor heat exchanger needs to be defrosted in order to ensure the heating effect and avoid excessive frost condensation.
Here, the following methods are mainly used to defrost the outdoor heat exchanger: firstly, reverse cycle defrosting is carried out, when the air conditioner carries out reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; secondly, an electric heating device is added on a refrigerant pipeline of the air conditioner, the electric heating device is used for heating the refrigerant flowing into the outdoor heat exchanger, and then the heat of the refrigerant is used for melting the frost condensed on the outdoor heat exchanger; and thirdly, adjusting the operation parameters of the air-conditioning components such as the compressor, the electronic expansion valve and the like to change the temperature and 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; generally, in the related art, defrosting is judged by comparing numerical values between outdoor environment temperature and frost point temperature, and because a frosting device of the outdoor heat exchanger is influenced by various factors such as outdoor environment, self running state and the like, the defrosting judgment mode is too rough, and the requirement of the air conditioner for accurately triggering defrosting action is difficult to meet.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for air conditioner defrosting and an air conditioner, and aims to solve the technical problem of low air conditioner defrosting judgment accuracy in the related art.
In some embodiments, the control method for defrosting an air conditioner includes:
acquiring the outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature of an outdoor unit 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 outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet 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 heating device 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 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 realize the following technical effects:
the control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired outdoor air outlet temperature, refrigerant inlet temperature and refrigerant outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant admission pipeline, can effectively improve the refrigerant temperature of flowing into outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost that condenses on the outdoor heat exchanger to reduce the adverse effect of frost condensation to air conditioner self heating performance.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a control method for defrosting an air conditioner according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control device for defrosting 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 outdoor air outlet temperature, refrigerant liquid inlet temperature and refrigerant liquid outlet temperature of an outdoor unit;
in an embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a severe working condition with low temperature and high humidity, and at this time, a user generally sets the air conditioner to operate in a heating mode so as to heat and raise the temperature of the indoor environment by using the air conditioner. Therefore, the control method for defrosting the air conditioner provided by the embodiment of the disclosure is a control flow which is started when the air conditioner operates in a heating mode.
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 alternative embodiment, the outdoor unit of the air conditioner is provided with a first temperature sensor, and the first temperature sensor can be used for detecting the real-time outlet air temperature of the outlet air flow of the outdoor unit; therefore, the outdoor outlet air temperature obtained in step S101 may be the real-time temperature of the outdoor outlet air flow detected by the first temperature sensor;
optionally, the first temperature sensor is disposed on an air outlet grille of the outdoor unit, so that the first temperature sensor is located on an air outlet path of an air outlet flow of the outdoor heat exchanger, thereby improving detection accuracy of the outdoor air outlet temperature.
In the embodiment of the disclosure, the outdoor outlet air temperature can reflect the temperature change condition of the outdoor environment discharged into the outdoor environment after the heat exchange between the outdoor environment and the outdoor unit is carried out to a certain extent, and further can reflect the heat exchange quantity or the heat exchange efficiency between the outdoor environment and the outdoor unit; for example, in the case where frost is condensed on the outer surface of the casing of the outdoor heat exchanger, the amount of heat exchange between the outdoor heat exchanger and the outdoor environment is reduced, the heat exchange efficiency is reduced, and the amount of heat absorbed by the air flowing through the outdoor heat exchanger is reduced, so that the temperature of the outlet air flow is slightly higher than that in the case where frost is not condensed on the outdoor heat exchanger; therefore, the acquired change condition of the outdoor outlet air temperature can be used as a reference factor for measuring the frosting degree of the outdoor heat exchanger.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a second temperature sensor, and the second temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant inlet pipeline of the outdoor heat exchanger; therefore, the liquid inlet temperature of the refrigerant obtained in step S101 may be the real-time temperature of the refrigerant detected by the second temperature sensor;
here, the refrigerant liquid inlet line is a line through which the refrigerant flows into the outdoor heat exchanger when the air conditioner operates in the heating mode.
In the embodiment of the disclosure, the temperature of the refrigerant flowing into the outdoor heat exchanger is an internal temperature factor directly influencing the shell temperature of the outdoor heat exchanger; here, when the air conditioner operates in a heating mode, the outdoor heat exchanger absorbs heat from the outdoor environment, and the heat transfer sequence is refrigerant in the indoor pipeline of the outdoor environment, the outdoor heat exchanger shell and the outdoor heat exchange shell; because the temperature difference between the outdoor heat exchanger and the heat exchanger can influence the heat conduction efficiency, the temperature of the refrigerant flowing into the outdoor heat exchanger can change the heat conduction rate of the refrigerant in the internal pipeline from the outdoor heat exchanger shell, and further can influence the temperature change of the outdoor heat exchanger shell; therefore, the obtained refrigerant inlet liquid temperature can be used as a reference factor for measuring the influence of the internal temperature condition of the air conditioner on the frosting of the outdoor heat exchanger.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a third temperature sensor, and the third temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger; therefore, the refrigerant liquid outlet pipeline obtained in step S101 may be the real-time temperature of the refrigerant detected by the third temperature sensor;
here, the refrigerant outflow line is a line through which the refrigerant flows out of the outdoor heat exchanger when the air conditioner operates in the heating mode.
In the embodiment of the disclosure, the temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment, and the heat exchange efficiency is influenced by the frosting degree of the outdoor heat exchanger; here, when the frost formation degree of the air conditioner is low and the thickness of the frost is thin, the influence of the frost on heat exchange is small, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is large; under the conditions of high frosting degree and thick frost thickness of the air conditioner, the influence of the frost on heat exchange is large, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is 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.
And S102, after the condition of meeting the defrosting entry condition is determined according to the outdoor air outlet temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, controlling the refrigerant flowing through the refrigerant liquid inlet 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 outdoor outlet air temperature, the refrigerant inlet liquid temperature, and the refrigerant outlet liquid temperature obtained in step S101; the outdoor outlet air temperature is a reference factor for reflecting the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment, the refrigerant inlet liquid temperature influences the internal temperature factor of the shell temperature of the outdoor heat exchanger, and the refrigerant outlet liquid temperature is a reference factor for reflecting the current frosting degree of the outdoor heat exchanger; therefore, the embodiment of the disclosure integrates the three factor parameters to judge whether the air conditioner has the frosting problem, 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:
Tmax-Tair outletΔ T1 and TDischarging liquid-TFeeding liquid≤△T2；
Wherein, TmaxThe maximum value of the outdoor outlet air temperature, T, recorded after the air conditioner is started up and operated at this timeAir outletIs the outdoor outlet air temperature, TFeeding liquidIs the temperature of the refrigerant inlet liquid, TDischarging liquidThe temperature of the refrigerant outlet liquid is delta T1, and delta T2 is a preset first temperature difference threshold value, and is a preset second temperature difference threshold value.
In the defrosting entry condition, the heat exchange efficiency of the outdoor environment and the outdoor heat exchanger under different frosting conditions can be reflected by the temperature difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature; for example, when the air conditioner is not frosted, the outdoor outlet air temperature is slightly low, so that the difference between the maximum outdoor outlet air temperature and the outdoor outlet air temperature is large; and under the condition that the air conditioner is frosted, the outdoor air outlet temperature is slightly higher, so the difference between the maximum outdoor air outlet temperature and the outdoor air outlet temperature is small. Like this, one of the defrosting admission condition of this application is promptly according to the temperature variation of outdoor air-out temperature under the different outdoor operating mode and carries out the defrosting and judge.
Meanwhile, the defrosting entry condition of the air conditioner is added with the temperature T of the refrigerant outlet liquidDischarging liquidAnd refrigerant feed temperature TFeeding liquidThe temperature difference between the two is judged, if the temperature difference between the two is smaller, the heat absorption and temperature rise efficiency of the refrigerant is lower, and the refrigerant possibly causes frosting of the air conditioner, so that the outdoor heat exchanger of the air conditioner needs to be defrosted under the condition; therefore, the sub-condition for judging defrosting according to the temperature of the refrigerant inlet and outlet liquid is introduced into the defrosting inlet condition so as to further improve the accuracy of judging defrosting.
Therefore, the defrosting entry condition in the embodiment of the disclosure comprehensively considers the influence of the parameters on the frosting of the outdoor heat exchanger under different working conditions, so that the judgment precision of the air conditioner defrosting can be effectively improved, and the problems of misjudgment, mistriggering and the like are reduced.
In the embodiment of the disclosure, after it is determined that the defrosting entry condition is satisfied according to the outdoor outlet air temperature, the refrigerant inlet temperature, and the refrigerant outlet temperature, the defrosting operation of the air conditioner includes controlling to heat the refrigerant flowing through the refrigerant inlet pipe of the outdoor heat exchanger of the air conditioner, 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 outdoor outlet air temperature, the refrigerant inlet temperature, and the refrigerant outlet temperature, the heating device may be controlled to be turned on; and under the condition that the defrosting entry condition is not met according to the outdoor air outlet temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, 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 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, when the refrigerant flowing through the refrigerant inlet line of the outdoor heat exchanger of the air conditioner is controlled to be heated in step S102, a heating parameter may be determined according to the temperature difference, and then a corresponding heating operation may be performed according to the heating parameter. Wherein the temperature difference comprises: a first temperature difference between the maximum outdoor outlet air temperature and the outdoor outlet air temperature, or a second temperature difference between the refrigerant outlet liquid temperature and the refrigerant inlet liquid temperature; the heating parameters include heating rate and/or heating duration of the refrigerant flowing through the refrigerant inlet pipeline.
In the above technical disclosure, the first temperature difference value and the second temperature difference value are respectively used for the judgment of one of the sub-conditions of the defrost entry condition; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the frosting degree of the outdoor heat exchanger may be estimated according to the first temperature difference and the second temperature difference, and the heating rate and the heating duration of the refrigerant flowing through the refrigerant liquid inlet pipeline may be selected according to the difference of the frosting degree.
For example, when the frosting degree of the outdoor heat exchanger is high, the heating rate of the refrigerant is set to be high, so that the heating and temperature rising speed of the refrigerant is increased, and the defrosting temperature requirement can be met as soon as possible; setting the heating time of the refrigerant to be longer so that the heat of the refrigerant has enough time to be conducted to the outer surface of the outdoor heat exchanger for defrosting; on the contrary, when the frosting degree of the outdoor heat exchanger is low, the heating rate of the refrigerant is set to be low, and the heating time is set to be short, so that the power consumption of the operation of the heating device is reduced, and the use cost of the air conditioner is reduced.
Optionally, determining a heating rate of the refrigerant flowing through the refrigerant inlet pipe according to the temperature difference includes: acquiring a corresponding first heating rate from the first rate incidence relation according to the first temperature difference so as to heat according to the first heating rate;
here, the first rate correlation includes a correspondence of one or more first temperature difference values to the first heating rate. An alternative first temperature difference versus first heating rate is shown in table 1, herein, as shown in the following table,
first temperature difference (Unit:. degree. C.) First heating Rate (Unit:. degree. C/min)
a1＜Tmax-TAir outlet≤a2 v11
a2＜Tmax-TAir outlet≤a3 v12
a3＜Tmax-TAir outlet v13
TABLE 1
The first rate correlation is such that the first heating rate is inversely related to the first temperature difference. I.e. the larger the first temperature difference, the lower the first heating rate; and the smaller the first temperature difference, the higher the first heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipeline in step S102 is performed, the first heating rate corresponding to the first temperature difference may be determined according to the first rate correlation, and then the heating operation 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: according to the second temperature difference, acquiring a corresponding second heating rate from the second rate incidence relation so as to heat according to the second heating rate;
here, the second rate correlation includes a correspondence of one or more second temperature difference values to the second heating rate. An alternative second temperature difference versus second heating rate is shown in table 2, here, as shown in the following table,
second temperature difference (Unit:. degree. C.) Second heating Rate (Unit:. degree. C/min)
b1＜TDischarging liquid-TLiquid feed≤b2 v21
b2＜TDischarging liquid-TFeeding liquid≤b3 v22
b3＜TDischarging liquid-TLiquid feed v23
TABLE 2
The second rate correlation is such that the second heating rate is negatively correlated with the second temperature difference. I.e. the larger the second temperature difference, the lower the second heating rate; and the smaller the second temperature difference, the higher the second heating rate.
Therefore, when the heating operation of the refrigerant flowing through the refrigerant inlet pipe in step S102 is performed, a second heating rate corresponding to the second temperature difference may be determined according to the second rate association relationship, and then heating may be performed according to the second heating rate.
In the above embodiment, because the frosting degree of the outdoor heat exchanger has different influence ranges on the temperature change of the first temperature difference and the second temperature difference, the first temperature difference and the second temperature difference are respectively provided with a single association relationship, and the air conditioner can select one of the association relationships to determine the corresponding heating rate according to actual needs.
Optionally, the specifically selected rate association relationship may be determined according to the heating requirement of the current user, for example, when the heating requirement of the current user is low, the first rate association relationship is selected, and at this time, the influence of reference factors, such as the outdoor outlet air temperature corresponding to the first temperature difference value, which can reflect the frosting degree on the defrosting effect is mainly considered; and when the heating demand of the current user is higher, the second rate incidence relation is selected, and at the moment, the influence of frosting of the outdoor heat exchanger on the refrigerant outlet temperature of the refrigerant with the temperature higher and lower than the temperature of the refrigerant flowing back to the compressor is mainly considered, so that the return air temperature of the refrigerant can be increased after the refrigerant is heated, and the heating performance is ensured.
Here, the heating demand of the current user may be determined by setting a target heating temperature for the air conditioner; for example, a heating temperature threshold is preset in the air conditioner, and when the target heating temperature actually set by the user is smaller than the heating temperature threshold, it indicates that the heating demand of the user is low at this time; and when the target heating temperature actually set by the user is greater than or equal to the heating temperature threshold, the heating requirement of the user is high or low at the moment.
Therefore, in the embodiment of the disclosure, the defrosting operation of the air conditioner to the outdoor heat exchanger can be timely triggered according to the actual frosting condition of the air conditioner, and meanwhile, the heating requirement of a user can be taken into consideration when the defrosting operation for heating the refrigerant is executed, so that the control requirement of the air conditioner on the comfort level of the user in the defrosting process is fully ensured.
Similarly, in some optional embodiments, the corresponding first heating time duration may be further obtained from the first time duration correlation according to the first temperature difference, so as to heat according to the first heating time duration.
Here, in the first time period correlation, the first heating time period and the first temperature difference are negatively correlated.
Or acquiring a corresponding second heating time length from the second time length incidence relation according to the second temperature difference value, so as to heat according to the second heating time length.
Here, in the second time period correlation, the second heating time period and the second temperature difference value are negatively correlated.
In the above embodiment, the manner of obtaining the first heating duration according to the first temperature difference and obtaining the second heating duration according to the second temperature difference may refer to the control flow of obtaining the heating rate according to the temperature difference, which is not described herein again.
In some optional embodiments, after controlling to heat the refrigerant flowing through the refrigerant liquid inlet pipeline, the method further includes: acquiring the temperature of an outdoor coil pipe; and after the defrosting exit condition is met according to the temperature of the outdoor coil, controlling to stop heating.
Wherein the defrost exit condition comprises: the temperature of the outdoor coil is greater than or equal to a preset outer coil temperature threshold value and is continuously set for a set time length.
After the temperature of the outdoor coil is obtained, judging whether the defrosting exit condition is met or not according to the temperature of the outdoor coil; 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 heating the refrigerant flowing through the refrigerant liquid inlet pipeline, the air conditioner performs the judgment operation on the defrosting exit condition in real time according to the parameter of the air conditioner, so as to stop the heating operation on the refrigerant under the condition that the defrosting exit condition is met, thereby effectively reducing the power consumption of the heating operation.
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, detecting outdoor air outlet temperature TAir outletRefrigerant feed temperature TFeeding liquidAnd refrigerant outflow temperature TDischarging liquid；
S203, judging whether T is presentmax-TAir outletLess than or equal to delta T1 and TDischarging liquid-TLiquid feedΔ T2, if yes, executing step S204, if no, returning to execute step S202;
in the disclosed embodiments, TLiquid feed-TaoΔ T1 and TDischarging liquid-TFeeding liquidTogether constitute the preset defrost entry conditions.
After the air conditioner is started to operate, the temperature sensor detects the outdoor outlet air temperature in real time, and a plurality of detected outdoor outlet air temperatures are stored as historical data; therefore, when the determination step of step S203 is executed, a plurality of outdoor outlet air temperatures in the historical data may be retrieved, and the maximum value T of the outdoor outlet air temperature may be determined through comparisonmax；
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.
S204, according to Tmax-TAir outletAcquiring a corresponding first heating rate from the first rate association relation;
s205 according to Tmax-TAir outletAcquiring a corresponding first heating time length from the first time length incidence relation;
in the embodiment of the present disclosure, reference may be made to the foregoing embodiments for specific execution manners of steps S204 and S205, which are not described herein again.
S206, starting a heating device according to the first heating rate and the first heating time length; the flow ends.
In an embodiment of the disclosure, the heating device is disposed on a refrigerant inlet pipe of the outdoor heat exchanger in the heating mode, and is configured to heat a refrigerant flowing through the refrigerant inlet pipe.
Optionally, the heating device is an electromagnetic heating device, and thus the adjustment of the first heating rate can be realized 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 outdoor air outlet temperature, refrigerant inlet temperature and refrigerant outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant admission pipeline, can effectively improve the refrigerant temperature of flowing into outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost that condenses on the outdoor heat exchanger to reduce the adverse effect of frost condensation to air conditioner self heating performance.
Fig. 3 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting an air conditioner, which has a structure as shown in fig. 3, and includes:
a processor (processor)300 and a memory (memory)301, and may further include a Communication Interface 302 and a bus 303. The processor 300, the communication interface 302 and the memory 301 may communicate with each other through the 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;
a heating device 45 disposed on the refrigerant inlet pipeline of the outdoor heat exchanger 41 in the heating mode, and configured to heat the refrigerant flowing through the refrigerant inlet 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 air conditioner defrosting is the control device shown in the foregoing embodiment.
The air conditioner in the embodiment of the disclosure can accurately detect and judge whether the air conditioner has the frosting problem or not, and under the condition that the frosting problem exists in the air conditioner, utilize foretell controlling means and heating device to carry out corresponding defrosting operation to reduce the frost amount of condensing on the outdoor heat exchanger of air conditioner, guarantee that the air conditioner can normally heat the indoor environment under the low temperature severe cold climate condition, promote user's use and experience.
Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.
Embodiments of the present disclosure also provide a computer program product comprising a computer program stored on a computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described method for defrosting an air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, 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 portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes, and may also be a transient storage medium.
The above description and 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, provided that all occurrences of the first element are renamed consistently and all occurrences of the second element are renamed consistently. The first and second elements are both elements, but may not be the same elements. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (7)

1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
acquiring the outdoor air outlet temperature, the refrigerant inlet temperature and the refrigerant outlet temperature of an outdoor unit in the process of the air conditioner running heating mode;
after the condition of meeting defrosting entry conditions is determined according to the outdoor air outlet temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, controlling to heat the refrigerant flowing through a refrigerant liquid inlet pipeline of an outdoor heat exchanger of the air conditioner;
the defrost entry conditions include:
Tmax-Tair outletΔ T1 and TDischarging liquid-TFeeding liquid≤△T2；
Wherein, TmaxIs that theThe maximum value of outdoor air outlet temperature, T, recorded after the air conditioner is started up and operatedAir outletIs the outdoor outlet air temperature, TFeeding liquidIs the inlet liquid temperature of the refrigerant, TDischarging liquidThe liquid outlet temperature of the refrigerant is determined, wherein the delta T1 is a preset first temperature difference threshold value, and the delta T2 is a preset second temperature difference threshold value;
the heating parameters for heating the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner are determined according to the temperature difference;
wherein the temperature difference comprises: a first temperature difference between the maximum outdoor outlet air temperature and the outdoor outlet air temperature, or a second temperature difference between the refrigerant outlet liquid temperature and the refrigerant inlet liquid temperature;
the heating parameters comprise the heating rate and/or the heating time of the refrigerant flowing through the refrigerant liquid inlet 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 a combination thereof,
according to the second temperature difference, acquiring a corresponding second heating rate from a second rate incidence relation so as to heat according to the second heating rate;
when the heating demand of the current user is low, a first rate incidence relation is selected; and when the heating demand of the current user is higher, selecting a second rate incidence relation.
2. The control method according to claim 1,
in the first rate correlation, the first heating rate is negatively correlated with the first temperature difference;
in the second rate correlation, the second heating rate is negatively correlated with the second temperature difference.
3. 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 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.
4. The control method according to claim 3,
in the first time length incidence relation, the first heating time length and the first temperature difference value are in negative correlation;
in the second time length correlation relationship, the second heating time length and the second temperature difference value are in negative correlation.
5. The control method according to any one of claims 1 to 4, further comprising, after controlling heating of the refrigerant flowing through the refrigerant inlet line:
acquiring the temperature of an outdoor coil;
after the defrosting exit condition is met according to the temperature of the outdoor coil, controlling to stop heating;
wherein the defrost exit condition comprises: the temperature of the outdoor coil is greater than or equal to a preset outer coil temperature threshold value and the set duration is continuous.
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 heating device 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;
a control apparatus for defrosting an air conditioner in accordance with claim 6, electrically connected to said heating means.
CN201910672132.1A 2019-07-24 2019-07-24 Control method and device for defrosting of air conditioner and air conditioner Active CN110469965B (en)

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CN106765673A (en) * 2016-11-30 2017-05-31 美的集团武汉制冷设备有限公司 Heat pump and its defrosting control method
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* Cited by examiner, † Cited by third party
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CN103596783A (en) * 2011-06-10 2014-02-19 Lg电子株式会社 Air conditioner in electric vehicle
CN105371359A (en) * 2014-09-01 2016-03-02 Tcl空调器(中山)有限公司 Air conditioner and defrosting control method of air conditioner
CN104833060A (en) * 2015-05-22 2015-08-12 广东美的暖通设备有限公司 Defrosting control method and device for air conditioner
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