CN110470013B - 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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- CN110470013B CN110470013B CN201910713179.8A CN201910713179A CN110470013B CN 110470013 B CN110470013 B CN 110470013B CN 201910713179 A CN201910713179 A CN 201910713179A CN 110470013 B CN110470013 B CN 110470013B
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- heating
- air conditioner
- defrosting
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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
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
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: under the condition that the air conditioner needs defrosting, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on a refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner; obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger; and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to exit the reverse cycle defrosting mode and stopping executing the first heating operation. The time for the air conditioner to quit defrosting is comprehensively judged by utilizing a plurality of temperature parameters of the outdoor heat exchanger, so that the control precision for controlling the air conditioner to quit defrosting is improved; and the adverse effect of frost condensation on the performance of the air conditioner is accelerated and reduced by a reverse circulation defrosting mode and a mode of heating the refrigerant flowing through the refrigerant liquid outlet pipeline. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.
Description
Technical Field
The application relates to the technical field of air conditioner defrosting, for example, to a control method and device for air conditioner defrosting and an air conditioner.
Background
At present, most of main flow machine types of air conditioners have a heat exchange function of a refrigerating and heating double mode, and users generally adjust the air conditioners to a heating mode to utilize the air conditioners to increase the temperature of indoor environment in low-temperature areas or under the weather conditions with large wind and snow; 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 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 modes of the outdoor heat exchanger have influence on the normal heating performance of the air conditioner more or less, the air conditioner can judge before quitting defrosting, and then the air conditioner is controlled to quit defrosting according to the judgment result. In the related art, whether to quit defrosting is generally judged by comparing the outdoor environment temperature with the frost point temperature. Because the frost condition of the outdoor heat exchanger can be influenced by various factors such as the outdoor environment, the running state of the outdoor heat exchanger and the like, the judgment mode of whether to quit the defrosting mode is too rough, the air conditioner is easy to quit the defrosting mode in advance to cause incomplete defrosting, or the defrosting mode is continuously run after defrosting is finished to influence the normal heating performance of the air conditioner.
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 problems that in the related art, the judgment mode of whether to exit a defrosting mode is too rough, the air conditioner is easy to exit the defrosting mode in advance, so that defrosting is not thorough, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is finished.
In some embodiments, the control method for defrosting an air conditioner includes:
under the condition that the air conditioner needs defrosting, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on a refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner;
obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger;
and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to exit the reverse cycle defrosting mode and stopping executing the first heating operation.
In some embodiments, the control device for air conditioner defrosting includes a processor and a memory storing program instructions, and the processor is configured to execute the control method for air conditioner defrosting when executing the program instructions.
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 outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting of the air conditioner is electrically connected with 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:
in the defrosting operation process of the air conditioner, the time for the air conditioner to quit defrosting is comprehensively judged by utilizing three parameters, namely the temperature of an outdoor coil pipe of an outdoor heat exchanger, the temperature of a coolant outlet liquid and the temperature of an upper shell, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved, the condition that the air conditioner quits a defrosting mode in advance to cause incomplete defrosting is avoided, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is finished is avoided; and the high-temperature refrigerant is utilized to defrost the outdoor heat exchanger in the reverse circulation defrosting mode, and the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse circulation mode is further improved in a mode of heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated and reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart diagram of a control method for defrosting an air conditioner according to an 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.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 1, including the following steps:
s101: and under the condition that the air conditioner needs defrosting, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on the refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner.
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.
Optionally, whether the air conditioner needs defrosting is judged by comparing the outdoor environment temperature with the frost point temperature. When the outdoor environment temperature is lower than the frost point temperature, the air conditioner is considered to need defrosting; when the outdoor ambient temperature is higher than the frost point temperature, the air conditioner is considered to be not required to defrost.
The reverse circulation defrosting mode comprises the step of controlling the flow direction of a refrigerant of the air conditioner to be switched to the flow direction opposite to the heating mode; in the mode flow, the high-temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger, so that the defrosting operation of the outdoor heat exchanger can be realized by utilizing the heat of the high-temperature refrigerant. Meanwhile, in the reverse circulation mode, the refrigerant liquid outlet pipeline in the heating mode is substantially changed into a refrigerant liquid inlet pipeline, namely, the refrigerant flows into the outdoor heat exchanger through the refrigerant liquid outlet pipeline in the refrigeration mode at the moment; therefore, the temperature of the refrigerant flowing into the indoor heat exchanger can be further increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the actual defrosting effect can be enhanced.
Optionally, a heating device is disposed at a refrigerant outlet pipe of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet pipe. Under the condition that the air conditioner needs defrosting, the heating device can be controlled to be started; and under the condition that the air conditioner does not need heating, the off state of the heating device is kept.
In one embodiment, the heating device is an electromagnetic heating device, which heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat the refrigerant.
The electromagnetic heating device mainly comprises an induction coil and a power supply module, wherein the induction coil is wound on the refrigerant pipeline section, and the power supply module can provide alternating current for the induction coil; when the induction coil is electrified, alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, and the alternating magnetic field can generate eddy currents in the refrigerant pipe section, so that the heating and warming effects can be realized by means of the energy of the eddy currents.
It should be understood that the type of the heating device for heating the refrigerant is not limited to the above electromagnetic heating device, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution of the present application and are covered by the protection scope of the present application.
S102: and obtaining the temperature of an outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell of the outdoor heat exchanger.
Optionally, a first temperature sensor is disposed at a coil position of an outdoor heat exchanger of the outdoor unit of the air conditioner, and the first temperature sensor may be configured to detect a real-time temperature of the coil position. Thus, the outdoor coil temperature acquired in step S102 may be the real-time temperature of the coil position detected by the first temperature sensor.
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 in addition, the temperature change condition is generally 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.
Optionally, a second temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the second temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger. Therefore, the refrigerant outlet temperature of the outdoor heat exchanger obtained in step S102 may be the real-time temperature of the refrigerant detected by the second 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.
The temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency of 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.
Optionally, a third temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the third temperature sensor can be used for detecting the upper shell temperature of the outdoor heat exchanger. Therefore, the upper case temperature acquired in step S102 may be the real-time temperature detected by the third temperature sensor.
The refrigerant liquid inlet pipeline of the outdoor heat exchanger is arranged at the lower part, and the refrigerant liquid outlet pipeline of the outdoor heat exchanger is arranged at the upper part, so that the refrigerant flows into the outdoor heat exchanger from the lower part and flows out of the outdoor heat exchanger from the upper part in the heating mode. Therefore, the temperature of the upper shell is influenced by the temperature of the refrigerant which flows through most pipelines of the outdoor heat exchanger and exchanges heat with the outdoor environment, and the heat exchange efficiency of the refrigerant under different frosting conditions can be reflected. Under the condition that the air conditioner is not frosted, the refrigerant absorbs more heat from the outdoor environment, so the temperature of the upper shell influenced by the refrigerant is higher; in the case of frost formation in the air conditioner, the refrigerant absorbs less heat from the outdoor environment, and therefore the upper casing temperature is also lower. Therefore, compared with the temperature of the outdoor coil pipe at the lower part of the outdoor heat exchanger, the temperature of the upper shell of the outdoor heat exchanger can more accurately reflect the frosting degree of the outdoor heat exchanger.
S103: and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to exit the reverse cycle defrosting mode and stopping executing the first heating operation.
In the process of heating the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner, the time for stopping heating and quitting defrosting of the air conditioner is comprehensively judged by utilizing three parameters of the outdoor coil temperature, the refrigerant liquid outlet temperature and the upper shell temperature of the outdoor heat exchanger. The temperature of the outdoor coil pipe can relatively sensitively reflect the temperature change conditions of refrigerant pipelines at different positions of the outdoor heat exchanger; the refrigerant outlet temperature can reflect the attenuation condition of the heating performance of the outdoor heat exchanger under the condition of frosting of the air conditioner; the temperature of the upper shell can reflect the heat exchange efficiency of the refrigerant under different frosting conditions. Therefore, the defrosting condition of the outdoor heat exchanger is comprehensively judged through three parameters of the outdoor coil temperature, the refrigerant outlet temperature and the upper shell temperature of the outdoor heat exchanger, the control precision for controlling the air conditioner to quit defrosting can be effectively improved, the condition that the air conditioner quits the defrosting mode in advance to cause incomplete defrosting is avoided, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is completed.
Optionally, the defrost exit condition is:
T1≥T01，t1≥t01，T2≥T02，t2≥t02，T3≥T03and t is3≥t03
Wherein, T1Is the outdoor coil temperature, T, of the outdoor heat exchanger01Is a first predetermined temperature, t1Is T1≥T01Duration of (d), t01Is a first preset duration, T2For the refrigerant outlet temperature, T, of the outdoor heat exchanger02Is a second predetermined temperature, t2Is T2≥T02Duration of (d), t02For a second predetermined duration, T3Is the upper shell temperature, T, of the outdoor heat exchanger03Is a third predetermined temperature, t3Is T3≥T03Duration of (d), t03A third preset duration.
Optionally, the first preset temperature is a pre-stored correction temperature of the outdoor coil after the defrosting of the outdoor heat exchanger is completed, which is detected in the air conditioner defrosting test process. After the outdoor heat exchanger finishes defrosting, the temperature of an outdoor coil pipe of the outdoor heat exchanger fluctuates to a certain extent due to reasons such as frost water evaporation and the like. Therefore, the temperature of the outdoor coil pipe detected in the process of testing the defrosting of the outdoor heat exchanger after the defrosting is finished is corrected, and the accuracy of the defrosting exit condition is improved.
The first preset temperature can be calculated by the following formula:
T01＝α*T001
wherein alpha is a first scale factor, T001The temperature of the outdoor coil after the defrosting of the outdoor heat exchanger is finished and detected in the defrosting test process of the air conditioner is detected. Alpha has a value range of [1.1, 1.3 ]]E.g. 1.1, 1.15, 1.2, 1.25, 1.3.
Optionally, the second preset temperature is a pre-stored correction temperature of the refrigerant outlet liquid temperature after the defrosting of the outdoor heat exchanger is completed, which is detected in the air conditioner defrosting test process. After defrosting of the outdoor heat exchanger is completed, heat exchange efficiency between the outdoor heat exchanger and an outdoor environment is affected due to reasons such as evaporation of frost water condensed on the outdoor heat exchanger, and further deviation occurs between detected refrigerant liquid outlet temperature and refrigerant liquid outlet temperature when the outdoor heat exchanger stably operates after actual defrosting is completed. Therefore, the refrigerant outlet liquid temperature after the defrosting of the outdoor heat exchanger is finished, which is detected in the air conditioner defrosting test process, is corrected, and the accuracy of the defrosting exit condition is improved.
The second preset temperature can be calculated by the following formula:
T02＝β*T002
wherein beta is a second proportionality coefficient, T002The temperature of the refrigerant discharged from the outdoor heat exchanger after defrosting is detected in the defrosting test process of the air conditioner. The value range of beta is [1.1, 1.4 ]]E.g. 1.1, 1.2, 1.3, 1.4.
Optionally, the third preset temperature is a pre-stored corrected temperature of the upper shell temperature after the defrosting of the outdoor heat exchanger detected in the air conditioner defrosting test process is completed. After the outdoor heat exchanger finishes defrosting, the temperature of the upper shell of the outdoor heat exchanger fluctuates to a certain extent due to reasons such as frost water evaporation and the like. Therefore, the temperature of the upper shell after the defrosting of the outdoor heat exchanger is finished, which is detected in the process of testing the defrosting of the air conditioner, is corrected, and the accuracy of the defrosting exit condition is improved.
The third preset temperature can be calculated by the following formula:
T03＝δ*T003
where, δ is the third proportionality coefficient, T003The upper shell temperature after the defrosting of the outdoor heat exchanger is finished is detected in the air conditioner defrosting test process. Delta is in the range of [1.1, 1.3 ]]E.g. 1.1, 1.15, 1.2, 1.25, 1.3.
Optionally, the first preset duration is in a value range of [2s, 5s ] (s: s), for example, 2s, 3s, 4s, 5 s; the value range of the second preset time length is [2s, 5s ], for example, 2s, 3s, 4s, 5 s; the third preset duration is in a range of [2s, 5s ], for example, 2s, 3s, 4s, 5 s.
In the defrosting exit condition, the temperature of the outdoor coil of the outdoor heat exchanger is greater than a first preset temperature, and the duration is greater than a first preset duration, so that the defrosting completion of the outer surface of the outdoor heat exchanger can be visually reflected; the refrigerant outlet temperature of the outdoor heat exchanger is greater than a second preset temperature, and the duration time is greater than the second preset time, so that the condition that the heating performance of the outdoor heat exchanger recovers at least frost or no frost can be reflected; the temperature of the upper shell of the outdoor heat exchanger is higher than the third preset temperature, and the duration is longer than the third preset duration, so that the defrosting completion of the outer surface of the outdoor heat exchanger can be accurately reflected. Therefore, the heating of the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger of the air conditioner can be stopped, and the defrosting operation mode of the air conditioner can be quitted.
In the embodiment, in the defrosting operation process of the air conditioner, the time for stopping heating and quitting defrosting of the air conditioner is comprehensively judged by using the three parameters of the outdoor coil temperature, the refrigerant outlet temperature and the upper shell temperature of the outdoor heat exchanger, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved, incomplete defrosting caused by the fact that the air conditioner quits the defrosting mode in advance is avoided, or the normal heating performance of the air conditioner is influenced by continuously operating the defrosting mode after defrosting is completed. In addition, the high-temperature refrigerant is utilized to defrost the outdoor heat exchanger in the reverse circulation defrosting mode, the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse circulation mode is further increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated and reduced.
Fig. 2 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 2, including the following steps:
s201: the air conditioner is started and runs in a heating mode.
S202: and controlling to execute a second heating operation on the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger.
In order to improve the heating performance of the air conditioner as soon as possible when the air conditioner is started, the second heating operation of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger is controlled and executed. At this time, the refrigerant flows out of the outdoor heat exchanger through the refrigerant liquid outlet pipe and flows back to the compressor, so that the second heating operation can improve the return air temperature of the refrigerant flowing back to the compressor, and the heating performance of the air conditioner at the starting-up stage is improved.
S203: and acquiring the return air temperature of a compressor of the air conditioner.
In this embodiment, the air return end of the air conditioner compressor is further provided with a temperature sensor, and the temperature sensor can be used for detecting the temperature of the refrigerant flowing through the air return end; therefore, the temperature of the refrigerant detected in real time can be acquired through the temperature sensor and used as the return air temperature for judging the temperature rise condition.
S204: and judging whether the return air temperature of the compressor meets the preset temperature rise condition or not.
Optionally, the temperature-increasing conditions include: the return air temperature is greater than or equal to a preset return air temperature threshold value.
S205: and when the return air temperature of the compressor meets the preset temperature rise condition, controlling to stop the second heating operation.
Under the condition that the return air temperature is greater than or equal to the preset return air temperature threshold value, the heating performance of the air conditioner at the moment is indicated so as to meet the current heating requirement, and the second heating operation can be controlled to stop, so that the power consumption of the second heating operation can be reduced under the condition that the heating requirement of the air conditioner is ensured; and under the condition that the return air temperature is lower than the preset return air temperature threshold, the heating performance of the air conditioner does not meet the current heating requirement at the moment, so that the second heating operation is kept unchanged.
S206: and judging whether the air conditioner needs to be defrosted or not.
S207: and determining heating parameters of heating according to the superheat degree of the air conditioner under the condition that the air conditioner needs to be defrosted.
Optionally, the heating parameter comprises a target heating rate, a target heating duration, or a target heating off duration.
The superheat of the air conditioner is generally referred to as a condenser, and refers to a difference between a saturation temperature corresponding to a refrigerant pressure at a point of an outlet of the condenser and an actual temperature of the refrigerant. The superheat degree of the air conditioner can be calculated according to the following formula:
SC＝Tan outlet-TMiddle part
Wherein SC is the superheat degree of the air conditioner, TAn outletThe condenser outlet temperature (indoor heat exchanger outlet temperature),Tmiddle partThe condenser middle temperature (indoor heat exchanger middle temperature).
If the superheat degree of the air conditioner is larger, the return air pressure and the temperature of the air conditioner are lower, and at the moment, the target heating rate needs to be improved, the target heating time length needs to be increased, the target heating interruption time length needs to be shortened, and the return air pressure and the temperature of the air conditioner need to be improved; if the superheat degree of the air conditioner is smaller, the return air pressure and the temperature of the air conditioner are higher, the target heating rate can be properly reduced, the target heating time duration is shortened, the target heating interruption time duration is increased, the power consumption of the operation of the heating device is reduced, and the use cost of the air conditioner is reduced. Therefore, the heating parameter of heating can be determined by the degree of superheat of the air conditioner.
Optionally, according to the degree of superheat, a corresponding heating rate is obtained from the heating rate correlation and the heating rate is taken as the target heating rate.
The heating rate correlation includes one or more superheat degrees and heating rate correlations. For example, table 1 shows an alternative superheat versus heating rate relationship:
table 1: correlation of heating rates
| Degree of superheat (unit:. degree. C.) | Heating Rate (Unit:. degree. C/min) |
| a1<SC≤a2 | V1 |
| a2<SC≤a3 | V2 |
| a3<SC | V3 |
In the heating rate correlation, the heating rate is positively correlated with the degree of superheat. That is, the greater the degree of superheat, the greater the heating rate; the smaller the degree of superheat, the smaller the heating rate.
Optionally, according to the degree of superheat, obtaining a corresponding heating duration from the heating duration correlation, and taking the heating duration as a target heating duration.
The heating time length correlation includes the corresponding relation between one or more superheat degrees and the heating time length. For example, table 2 shows an alternative superheat versus heating duration:
table 2: correlation of heating duration
| Degree of superheat (unit:. degree. C.) | Heating time (unit: min) |
| a1<SC≤a2 | t11 |
| a2<SC≤a3 | t12 |
| a3<SC | t13 |
In the correlation relationship of the heating time, the heating time is positively correlated with the degree of superheat. That is, the heating time period is longer as the degree of superheat is larger; the smaller the degree of superheat, the shorter the heating time period.
Optionally, according to the degree of superheat, obtaining a corresponding heating intermittent duration from the heating intermittent duration correlation, and taking the heating intermittent duration as a target heating intermittent duration.
The heating interruption duration correlation includes a correspondence between one or more degrees of superheat and heating interruption durations. For example, table 3 shows an alternative superheat versus heating off period:
table 3: correlation of heating interruption time
| Degree of superheat (unit:. degree. C.) | Heating interruption time (unit: min) |
| a1<SC≤a2 | t21 |
| a2<SC≤a3 | t22 |
| a3<SC | t23 |
In the correlation of the heating interruption time length, the heating interruption time length is in negative correlation with the superheat degree. That is, the larger the degree of superheat, the smaller the heating interruption period; the smaller the degree of superheat, the longer the heating off period.
S208: and controlling to enter a reverse circulation defrosting mode and executing a first heating operation on the refrigerant of the refrigerant liquid outlet pipeline of the outdoor heat exchanger according to the heating parameters.
After corresponding heating parameters (a target heating rate, a target heating duration and a target heating interruption duration) are obtained according to the heating parameter association relation, first heating operation on the refrigerant of the refrigerant liquid outlet pipeline of the outdoor heat exchanger is executed according to the corresponding heating parameters. Under the condition of ensuring normal defrosting of the air conditioner, the running power consumption of the heating device for heating the refrigerant is reduced as much as possible, and the energy-saving effect is achieved.
S209: and obtaining the temperature of an outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell of the outdoor heat exchanger.
S210: and judging whether the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet defrosting exit conditions or not.
S211: and under the condition that the temperature of the outdoor coil, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet the defrosting exit condition, controlling to exit the reverse cycle defrosting mode and stopping executing the first heating operation.
In this embodiment, the air conditioner is controlled to enter the reverse cycle defrosting mode and the heating device is further used to heat the refrigerant for defrosting, which may affect the normal heating mode of the air conditioner and bring extra power consumption to a certain extent. Therefore, under the condition that the temperature of the outdoor coil and the temperature of the shell on the upper part of the temperature of the refrigerant outlet liquid meet the defrosting exit condition, the reverse cycle defrosting mode is controlled to exit and the heating is stopped, the normal heating performance of the air conditioner is recovered, the loss of the heating device is reduced, and the running cost 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)30 and a memory (memory)31, and may further include a Communication Interface (Communication Interface)32 and a bus 33. The processor 30, the communication interface 32 and the memory 31 may communicate with each other through a bus 33. Communication interface 32 may be used for information transfer. The processor 30 may call logic instructions in the memory 31 to perform the control method for air conditioner defrosting of the above-described embodiment.
In addition, the logic instructions in the memory 31 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 31 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 30 executes functional applications and data processing by executing program instructions/modules stored in the memory 31, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 31 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 31 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.
An embodiment of the present disclosure provides an air conditioner, as shown in fig. 4, including:
a refrigerant circulation circuit formed by connecting an outdoor heat exchanger 41, an indoor heat exchanger 42, a throttling device 43 and a compressor 44 through refrigerant pipelines;
the heating device 45 is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 41 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device 46 for defrosting the air conditioner is electrically connected to the heating device 45.
According to the air conditioner provided by the embodiment, the time for the air conditioner to quit defrosting is comprehensively judged by utilizing three parameters, namely the coil temperature of the outdoor heat exchanger, the refrigerant outlet temperature and the upper shell temperature, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved; and the high-temperature refrigerant is utilized to defrost the outdoor heat exchanger in the reverse circulation defrosting mode, and the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse circulation mode is further improved in a mode of heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated and reduced.
The embodiment of the disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the control method for defrosting an air conditioner.
An embodiment of the present disclosure provides a computer program product including a computer program stored on a computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to execute the above control 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 disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising 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 (9)
1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
under the condition that the air conditioner needs defrosting, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on a refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner;
obtaining the temperature of an outdoor coil pipe, the temperature of refrigerant liquid outlet and the temperature of an upper shell of the outdoor heat exchanger;
under the condition that the temperature of the outdoor coil pipe, the temperature of the refrigerant outlet liquid and the temperature of the upper shell meet defrosting exit conditions, controlling to exit the reverse cycle defrosting mode and stopping executing the first heating operation;
the defrosting exit condition is as follows:
T1≥T01，t1≥t01，T2≥T02，t2≥t02，T3≥T03and t is3≥t03
Wherein, T1Is the outdoor coil temperature, T, of the outdoor heat exchanger01Is a first predetermined temperature, t1Is T1≥T01Duration of (d), t01Is a first preset duration, T2For the refrigerant outlet temperature, T, of the outdoor heat exchanger02Is a second predetermined temperature, t2Is T2≥T02Duration of (d), t02For a second predetermined duration, T3Is the upper shell temperature, T, of the outdoor heat exchanger03Is a third predetermined temperature, t3Is F3≥T03Duration of (d), t03A third preset duration.
2. The control method as claimed in claim 1, wherein controlling to perform the first heating operation of the refrigerant flowing through the refrigerant outflow line of the outdoor heat exchanger comprises:
determining heating parameters for heating according to the superheat degree of the air conditioner;
controlling to execute a first heating operation on the refrigerant of the refrigerant liquid outlet pipeline of the outdoor heat exchanger according to the heating parameters;
wherein the heating parameter comprises a target heating rate, a target heating time period or a target heating intermittent time period.
3. The control method according to claim 2, wherein determining the target heating rate based on the degree of superheat includes:
acquiring a corresponding heating rate from a heating rate association relation according to the superheat degree;
taking the heating rate as the target heating rate.
4. The control method according to claim 2, wherein determining the target heating period based on the degree of superheat includes:
acquiring corresponding heating time length from the correlation of the heating time lengths according to the superheat degree;
taking the heating time period as the target heating time period.
5. The control method according to claim 2, wherein determining the target heating intermittent period based on the degree of superheat includes:
acquiring corresponding heating intermittent duration from the correlation of the heating intermittent duration according to the superheat degree;
and taking the heating intermittent duration as the target heating intermittent duration.
6. The control method according to claim 1, characterized by further comprising:
and after the air conditioner is started in a heating mode, controlling and executing second heating operation of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger.
7. The control method according to claim 6, further comprising, after controlling to perform the second heating operation:
acquiring the return air temperature of a compressor of the air conditioner;
when the return air temperature of the compressor meets a preset temperature rise condition, controlling to stop the second heating operation;
wherein the temperature rise condition comprises: the return air temperature is greater than or equal to a preset return air temperature threshold value.
8. A control apparatus for air conditioner defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting according to any one of claims 1 to 7 when executing the program instructions.
9. An air conditioner, comprising:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
a control for defrosting an air conditioner in accordance with claim 8, electrically connected to said heating means.
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