CN110469960B - 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 PDFInfo
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- CN110469960B CN110469960B CN201910671536.9A CN201910671536A CN110469960B CN 110469960 B CN110469960 B CN 110469960B CN 201910671536 A CN201910671536 A CN 201910671536A CN 110469960 B CN110469960 B CN 110469960B
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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
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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
- F24F11/62—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
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- 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
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- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: acquiring the temperature of a first outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode; and after the condition of meeting the defrosting entry condition is determined according to the temperature of the first outdoor coil pipe, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet pipeline of an outdoor heat exchanger of the air conditioner to be heated. The control method provided by the embodiment of the disclosure can judge whether the air conditioner meets the defrosting entry condition according to the temperature of the outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, so that the control precision of controlling the defrosting of the air conditioner is improved; and the temperature of the refrigerant flowing into the outdoor heat exchanger is increased by heating the refrigerant flowing through the refrigerant liquid inlet pipeline, so that the frost condensed on the outdoor heat exchanger is melted. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.
Description
Technical Field
The application relates to the technical field of air conditioner defrosting, in particular to a control method and device for air conditioner defrosting and an air conditioner.
Background
At present, most of main flow machine types of air conditioners have a heat exchange function of a refrigerating and refrigerating double mode, and here, users generally adjust the air conditioners to a heating mode under the conditions of low-temperature areas or climates with heavy wind and snow so as to utilize the air conditioners to increase the temperature of indoor environments; in the operation and heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit plays a role of an evaporator absorbing heat from the outdoor environment, and is 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 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 temperature of a first outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode;
and after the condition of meeting the defrosting entry condition is determined according to the temperature of the first outdoor coil pipe, the refrigerant inlet temperature and the refrigerant outlet temperature, controlling the refrigerant flowing through a refrigerant inlet pipeline of an outdoor heat exchanger of the air conditioner to be heated.
In some embodiments, the control device for defrosting an air conditioner includes:
a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the control method for air conditioner defrosting in some of the embodiments described above.
In some embodiments, the air conditioner includes:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the 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 an air conditioner according to some embodiments of the present invention is electrically connected to the heating device.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve the following technical effects:
the control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired outdoor coil temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant 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, acquiring the temperature of a first outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of a heating mode of air conditioner operation;
in an embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a severe working condition with a low temperature and a high humidity, and at this time, a user generally sets the air conditioner to operate in a heating mode so as to heat and raise the temperature of the indoor environment by using the air conditioner. Therefore, the control method for defrosting the air conditioner provided by the embodiment of the disclosure is a control flow which is started when the air conditioner operates in a heating mode.
When the air conditioner operates in other modes such as a cooling mode, a dehumidification mode and the like, because the outdoor working conditions corresponding to the modes generally do not cause the problem of frosting of the outdoor unit of the air conditioner, optionally, when the air conditioner operates in other non-heating modes, the flow control process corresponding to the control method is not started, so that the situation that the defrosting action of the outdoor heat exchanger is mistakenly triggered in the modes such as the cooling mode and the dehumidification mode of the air conditioner, and the normal cooling or dehumidification working process of the air conditioner is influenced is avoided.
In an optional embodiment, a coil position of an outdoor heat exchanger of the outdoor air conditioner outdoor unit is provided with a first temperature sensor, and the first temperature sensor can be used for detecting the real-time temperature of the coil position of the first temperature sensor; thus, the first outdoor coil temperature acquired in step S101 may be the real-time temperature of the coil position detected by the first temperature sensor.
In the embodiment of the disclosure, the temperature change of the coil pipe position of the outdoor heat exchanger 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 outdoor coil can be used as a reference factor for measuring the frosting influence of the inside and the outside of the air conditioner on the outdoor heat exchanger.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a second temperature sensor, and the second temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant inlet pipeline of the outdoor heat exchanger; therefore, the liquid inlet temperature of the refrigerant obtained in step S101 may be the real-time temperature of the refrigerant detected by the second temperature sensor;
here, the refrigerant liquid inlet line is a line through which the refrigerant flows into the outdoor heat exchanger when the air conditioner operates in the heating mode.
In the embodiment of the disclosure, the temperature of the refrigerant flowing into the outdoor heat exchanger is an internal temperature factor directly influencing the shell temperature of the outdoor heat exchanger; here, when the air conditioner operates in a heating mode, the outdoor heat exchanger absorbs heat from the outdoor environment, and the heat transfer sequence is the refrigerant in the indoor pipelines of the outdoor environment, the outdoor heat exchanger shell and the outdoor heat exchange shell; the temperature difference between the outdoor heat exchanger and the heat exchanger can influence the heat conduction efficiency, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can change the heat conduction rate of the refrigerant flowing from the outdoor heat exchanger shell to the internal pipeline, and further can influence the temperature change of the outdoor heat exchanger shell; therefore, the obtained refrigerant inlet liquid temperature can be used as a reference factor for measuring the influence of the internal temperature condition of the air conditioner on the frosting of the outdoor heat exchanger.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a 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 temperature of the first outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, controlling the refrigerant flowing through a liquid inlet pipeline of the refrigerant 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 first outdoor coil temperature, the refrigerant liquid inlet temperature, and the refrigerant liquid outlet temperature obtained in step S101; the temperature of the first outdoor coil pipe can sensitively reflect the temperature change condition of a refrigerant pipeline of the outdoor heat exchanger, the liquid inlet temperature of the refrigerant is an internal temperature factor influencing the shell temperature of the outdoor heat exchanger, and the liquid outlet temperature of the refrigerant is a reference factor reflecting the current frosting degree of the outdoor heat exchanger; therefore, the embodiment of the disclosure integrates the three factor parameters to judge whether the air conditioner has the frosting problem, so that the judgment precision of the defrosting of the air conditioner can be greatly improved, and the defrosting operation triggered by the air conditioner can better accord with the real-time frosting condition of the air conditioner.
In an alternative embodiment, the defrost entry condition in step S102 includes:
△T e t is not less than V and T Discharging liquid -T Liquid feed ≤△T；
Wherein, T e Is as followsTemperature, delta T, of an outdoor coil e T is T e The temperature change rate in unit time t, V is a preset temperature change rate threshold; t is Discharging liquid For the temperature of the coolant leaving the liquid, T Liquid feed The temperature of the refrigerant inlet liquid is shown, and the delta T is a preset temperature difference threshold value.
In the defrosting entering condition, the temperature change rate of the outdoor coil temperature in unit time can reflect the situation that the temperature of the outdoor coil changes rapidly and slowly under the common influence of the internal environment and the external environment of the air conditioner; generally, when the outdoor environment has good working condition and the air conditioner is in normal operation, the temperature change of the refrigerant flowing into the outdoor unit does not fluctuate greatly, so the change rate of the temperature of the outdoor coil pipe also fluctuates little; when the outdoor environment is changed into a severe working condition which easily causes the frost condensation of the outdoor heat exchanger, the temperature of the outdoor coil pipe is quickly reduced under the influence of the temperature change of the outdoor environment, so that the temperature change rate of the outdoor coil pipe can also generate large fluctuation; therefore, one of defrosting entering conditions of the defrosting device is that defrosting judgment is carried out according to the temperature change speed of the outdoor coil pipe under different outdoor working conditions.
Meanwhile, the defrosting entry condition in the embodiment of the disclosure is added with the temperature T of the refrigerant outlet liquid Discharging liquid And refrigerant feed temperature T Feeding liquid The temperature difference between the two is judged, if the temperature difference between the two is smaller, the heat absorption and temperature rise efficiency of the refrigerant is lower, and the refrigerant possibly causes frosting of the air conditioner, so that the outdoor heat exchanger of the air conditioner needs to be defrosted under the condition; therefore, the 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 frosting influence of the parameters on the outdoor heat exchanger under different working conditions, so that the judgment precision of 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 first outdoor coil temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, the defrosting operation of the air conditioner includes controlling to heat the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner so as to increase the temperature of the refrigerant flowing into the outdoor heat exchanger, and at this time, since the temperature of the refrigerant flowing into the outdoor heat exchanger is higher, heat is transferred to one side of an outdoor environment, so that not only can frost of the outdoor heat exchanger be melted by using the heat of the refrigerant with the increased temperature, but also the temperature of the refrigerant flowing out of the outdoor heat exchanger and flowing back to the compressor can be increased so as to enhance the heating performance of the air conditioner.
Optionally, a heating device is disposed at a refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid inlet pipeline; therefore, in step S102, after it is determined that the defrosting entry condition is satisfied according to the temperature of the first outdoor coil, 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 entering condition is not met according to the temperature of the first outdoor coil, the liquid inlet temperature of the refrigerant and the liquid outlet temperature of the refrigerant, 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 alternative embodiment, when the refrigerant flowing through the refrigerant inlet pipe 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 a temperature change rate or a temperature difference, and then a corresponding heating operation may be performed according to the heating parameter. Wherein the temperature difference comprises: the temperature difference between the refrigerant liquid outlet temperature and the refrigerant liquid inlet temperature; the heating parameters include heating rate and/or heating duration of the refrigerant flowing through the refrigerant inlet pipeline.
Here, the temperature change rate and the temperature difference value are respectively used for judgment of one of the sub-conditions of the defrosting entry condition; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the frosting degree of the outdoor heat exchanger may be estimated according to the first temperature change rate and the temperature difference, and the heating rate and/or 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 change rate includes: and acquiring a corresponding first heating rate from the first rate correlation according to the temperature change rate, so as to heat according to the first heating rate.
Here, the first rate correlation includes a correspondence of one or more temperature change rates to the first heating rate. An alternative temperature change rate versus first heating rate is shown in table 1, herein, as shown in the following table,
| rate of temperature change (unit:. degree. C/min) | First heating Rate (Unit:. degree. C/min) |
| V1＜△T e /t≤V2 | v11 |
| V2＜△T e /t o ≤V3 | v12 |
| V3＜△T e /t o | v13 |
TABLE 1
In the first rate correlation, the first heating rate is positively correlated with the temperature change rate. I.e., the greater the rate of change of temperature, 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 temperature change rate may be determined according to the first rate correlation, 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: acquiring a corresponding second heating rate from the second rate incidence relation according to the temperature difference so as to heat according to the second heating rate;
here, the second rate correlation includes a correspondence of one or more temperature difference values to the second heating rate. An alternative temperature difference versus second heating rate is shown in table 2, here, as shown in the following table,
TABLE 2
The second rate correlation is such that the second heating rate is inversely related to the temperature difference. I.e. the larger the temperature difference, the lower the second heating rate; and the smaller the 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, the second heating rate corresponding to the 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 frosting degree of the outdoor heat exchanger has different influence ranges on the temperature change rate of the outdoor coil and the temperature change of the temperature difference, the outdoor coil and the outdoor coil are respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships according to actual needs to determine the corresponding heating rate.
Optionally, the specifically selected rate association relationship may be determined according to the heating requirement of the current user, for example, when the heating requirement of the current user is low, the first rate association relationship is selected, and at this time, the influence of the outdoor coil temperature and the like corresponding to the temperature change rate on the defrosting effect is mainly considered; and when the heating demand of the current user is higher, the second rate incidence relation is selected, and at the moment, the influence of frosting of the outdoor heat exchanger on the refrigerant outlet temperature of the refrigerant with the temperature higher and lower than the temperature of the refrigerant flowing back to the compressor is mainly considered, so that the return air temperature of the refrigerant can be increased after the refrigerant is heated, and the heating performance is ensured.
Here, the heating demand of the current user may be determined by setting a target heating temperature for the air conditioner; for example, a heating temperature threshold is preset in the air conditioner, and when the target heating temperature actually set by the user is smaller than the heating temperature threshold, it indicates that the heating demand of the user is low at this time; and when the target heating temperature actually set by the user is greater than or equal to the heating temperature threshold, the heating requirement of the user is high or low at the moment.
Therefore, in the embodiment of the disclosure, the defrosting operation of the air conditioner to the outdoor heat exchanger can be timely triggered according to the actual frosting condition of the air conditioner, and meanwhile, the heating requirement of a user can be considered when the defrosting operation for heating the refrigerant is executed, so that the control requirement of the air conditioner on the comfort level of the user in the defrosting process is fully ensured.
Similarly, in some optional embodiments, the corresponding first heating time duration may be further obtained from the first time duration correlation according to the temperature change rate, so as to heat according to the first heating time duration.
Here, in the first time period correlation, the first heating time period is positively correlated with the temperature change rate.
Or acquiring a corresponding second heating time length from the second time length correlation according to the temperature difference, so as to heat according to the second heating time length.
Here, in the second time period correlation, the second heating time period and the second temperature difference are in negative correlation.
In the above embodiment, the manner of obtaining the first heating duration according to the temperature change rate and obtaining the second heating duration according to the temperature difference may refer to the control procedure for obtaining the heating rate, which is not described herein again.
In some optional embodiments, after controlling to heat the refrigerant flowing through the refrigerant inlet line of the outdoor heat exchanger of the air conditioner, the method further includes: acquiring the temperature of a second outdoor coil; and after the defrosting exit condition is met according to the temperature of the second outdoor coil, controlling to stop heating.
Wherein the defrost exit condition comprises: the temperature of the second outdoor coil pipe is greater than or equal to a preset outer coil temperature threshold value and lasts for a set time length.
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 temperature of the outdoor coil 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 the temperature T of the outdoor coil e Refrigerant feed temperature T Feeding liquid And refrigerant outflow temperature T Discharging liquid ；
S203, calculating the temperature change rate delta T of the outdoor coil temperature Te e /t；
S204, judging whether delta T exists e T is not less than V and T Discharging liquid -T Feeding liquid Δ T is less than or equal to, if yes, step S205 is executed, if no, step S202 is executed again;
in the disclosed embodiment, Δ T e T is not less than V and T Discharging liquid -T Feeding liquid And the delta T is less than or equal to the delta T to jointly form a preset defrosting entering condition.
If the defrosting entry condition is met, the problem that the outdoor heat exchanger of the air conditioner frosts at the moment is solved; and if the defrosting entering condition is not met, the problem that the outdoor heat exchanger of the air conditioner is frosted does not exist at the moment.
S205 according to Δ T e T, acquiring a corresponding first heating rate from the first rate association relation;
s206 according to Delta T e T, acquiring 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 implementation manners of steps S205 and S206, which are not described herein again.
S207, 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 pipeline of the outdoor heat exchanger in the heating mode, and is configured to heat a refrigerant flowing through the refrigerant inlet pipeline.
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 coil temperature, the refrigerant liquid inlet temperature and the refrigerant liquid outlet temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and the temperature of the refrigerant flowing into the outdoor heat exchanger can be effectively increased by heating the refrigerant flowing through the refrigerant liquid inlet pipeline, and then the frost condensed on the outdoor heat exchanger is melted by utilizing the heat of the refrigerant, so that the adverse effect of the frost condensation on the heating performance of the air conditioner is reduced.
Fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting of an air conditioner, which is structurally shown in fig. 3 and includes:
a processor (processor)300 and a memory (memory)301, and may further include a Communication Interface 302 and a bus 303. The processor 300, the communication interface 302 and the memory 301 may communicate with each other via a bus 303. The communication interface 302 may be used for information transfer. The processor 300 may call logic instructions in the memory 301 to perform the control method for defrosting the air conditioner of the above-described embodiment.
In addition, the logic instructions in the memory 301 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 301 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 300 executes functional applications and data processing by executing program instructions/modules stored in the memory 301, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 301 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 301 may include a high-speed random access memory, and may also include a 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 pipe of the outdoor heat exchanger 41 in the heating mode, and configured to heat the refrigerant flowing through the refrigerant inlet pipe;
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, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments of the present disclosure includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same elements. Furthermore, the words used in the specification are words of description for example only and are not limiting upon 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 disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (7)
1. A control method for defrosting an air conditioner is characterized by comprising the following steps:
acquiring the temperature of a first outdoor coil, the liquid inlet temperature of a refrigerant and the liquid outlet temperature of the refrigerant in the process of the air conditioner running heating mode;
after the condition of meeting defrosting entry conditions is determined according to the temperature of the first outdoor coil pipe, 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;
wherein the defrost entry conditions include:
△T e t is not less than V and T Discharging liquid -T Feeding liquid ≤△T；
Wherein, the T is e For said first outdoor coil temperature, said Δ T e T is said T e The temperature change rate in unit time t, V is a preset temperature change rate threshold; the T is Discharging liquid For the temperature of the refrigerant outlet liquid, T Feeding liquid The temperature of the refrigerant inlet liquid is shown, and the delta T is a preset 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 change rate or the temperature difference value and a preset incidence relation; wherein the temperature difference comprises: the temperature difference between the refrigerant liquid outlet temperature and the refrigerant liquid inlet temperature; the heating parameters comprise the heating rate and/or the heating duration of the refrigerant flowing through the refrigerant liquid inlet pipeline; the preset incidence relation is selected from the first rate incidence relation and the second rate incidence relation according to the heating requirement of the user; wherein the first rate incidence relation is a corresponding relation between the temperature change rate and the first heating rate, and the second rate incidence relation is a corresponding relation between the temperature difference and the second heating rate;
acquiring the temperature of a second outdoor coil; after the defrosting exit condition is met according to the temperature of the second outdoor coil, controlling to stop heating; wherein the defrost exit condition comprises: the temperature of the second outdoor coil is greater than or equal to a preset outer coil temperature threshold value and lasts for a set time.
2. The method of claim 1, wherein determining a heating rate of a refrigerant flowing through the refrigerant inlet line based on the rate of change in temperature comprises:
and acquiring a corresponding first heating rate from the first rate incidence relation according to the temperature change rate, so as to heat according to the first heating rate.
3. The method of claim 1, wherein determining a heating rate of the refrigerant flowing through the refrigerant inlet line based on the temperature difference comprises:
and acquiring a corresponding second heating rate from a second rate incidence relation according to the temperature difference so as to heat according to the second heating rate.
4. The method of claim 1, wherein determining a heating duration for the refrigerant flowing through the refrigerant inlet line based on the rate of temperature change comprises:
and acquiring corresponding first heating time length from the first time length incidence relation according to the temperature change rate, so as to heat according to the first heating time length.
5. The method of claim 1, wherein determining a duration of heating the refrigerant flowing through the refrigerant inlet line based on the temperature difference comprises:
and acquiring a corresponding second heating time length from a second time length incidence relation according to the temperature difference so as to heat according to the second heating time length.
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.
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