CN110470008B - 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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- 238000010257 thawing Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 218
- 239000003507 refrigerant Substances 0.000 claims abstract description 181
- 239000007788 liquid Substances 0.000 claims description 50
- 230000000694 effects Effects 0.000 abstract description 11
- 230000005494 condensation Effects 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 abstract description 5
- 230000000875 corresponding effect Effects 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 12
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- 230000006870 function Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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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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Abstract
本申请涉及空调除霜技术领域，公开一种用于空调除霜的控制方法。控制方法包括：在空调需要进行除霜的情况下，控制对流经空调的室外换热器的冷媒进液管路和冷媒出液管路的冷媒加热；获得室外换热器的室外盘管温度和室外换热器的冷媒出液温度；在室外盘管温度和冷媒出液温度满足除霜退出条件的情况下，控制停止加热。利用室外换热器的盘管温度和冷媒出液温度这两个参数综合判断空调退出除霜的时机，从而可以有效提高对控制空调退出除霜的控制精度；并通过对流经冷媒进液管路和冷媒出液管路的冷媒的加热操作，降低冰霜凝结对空调自身制热性能的不利影响。本申请还公开一种用于空调除霜的控制装置及空调。
The present application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method includes: under the condition that the air conditioner needs to be defrosted, controlling the heating of the refrigerant on the refrigerant inlet pipeline and the refrigerant outlet pipeline flowing through the outdoor heat exchanger of the air conditioner; obtaining the temperature of the outdoor coil of the outdoor heat exchanger and the The refrigerant outlet temperature of the outdoor heat exchanger; when the outdoor coil temperature and refrigerant outlet temperature meet the defrosting exit conditions, the control will stop heating. Use the two parameters of the coil temperature of the outdoor heat exchanger and the refrigerant outlet temperature to comprehensively judge the timing of the air conditioner exiting defrosting, which can effectively improve the control accuracy of the air conditioner exiting defrosting; And the heating operation of the refrigerant in the refrigerant outlet pipeline reduces the adverse effect of frost condensation on the heating performance of the air conditioner itself. The application also discloses a control device for defrosting an air conditioner and an air conditioner.
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, the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner is controlled to be heated;
obtaining the temperature of an outdoor coil of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger;
and under the condition that the temperature of the outdoor coil pipe and the temperature of the refrigerant outlet liquid meet the defrosting exit condition, controlling to stop heating.
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 first 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 second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting of the air conditioner is electrically connected with the first heating device and the second heating device respectively.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve the following technical effects:
in the defrosting operation process of the air conditioner, the time for the air conditioner to quit defrosting is comprehensively judged by utilizing two parameters, namely the coil temperature of the outdoor heat exchanger and the refrigerant outlet temperature, so that 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 finished is avoided; and through the heating operation to the refrigerant that flows through refrigerant inlet pipe way and refrigerant outlet pipe way, can enough effectively improve the refrigerant temperature of inflow outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost of condensing on the outdoor heat exchanger, also can improve the refrigerant temperature who flows back to the compressor to promote heating efficiency, reduce the adverse effect of frost condensation to air conditioner self heating performance.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a 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 the heating of the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
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 defrosting operation of the air conditioner comprises the step of controlling the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner to be heated, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can be effectively increased, the frost condensed on the outdoor heat exchanger is melted by using the heat of the refrigerant, and the temperature of the refrigerant flowing back to a compressor can also be increased, the heating efficiency is improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is reduced.
Optionally, a first heating device is disposed at a refrigerant liquid inlet pipeline of the air conditioner outdoor heat exchanger, and the first heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid inlet pipeline. Under the condition that the air conditioner needs defrosting, the first heating device can be controlled to be started; and under the condition that the air conditioner does not need heating, the closed state of the first heating device is kept. The second heating device is arranged at the position of a refrigerant liquid outlet pipeline of the air conditioner outdoor heat exchanger and is used for controllably heating the refrigerant flowing through the refrigerant liquid outlet pipeline. Under the condition that the air conditioner needs defrosting, the second heating device can be controlled to be started; and under the condition that the air conditioner does not need heating, the closed state of the second heating device is kept.
In an embodiment, the first heating device and the second heating device are electromagnetic heating devices, and the electromagnetic heating devices heat the refrigerant pipeline by using the principle of electromagnetic induction heating, and further conduct heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to achieve the purpose of heating 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 types of the first heating device and the second heating device for heating the refrigerant in the present application are not limited to the above electromagnetic heating devices, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution in the present application and are covered by the protection scope of the present application.
S102: and obtaining the temperature of an outdoor coil of the outdoor heat exchanger and the temperature of the refrigerant outlet liquid 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.
S103: and under the condition that the temperature of the outdoor coil pipe and the temperature of the refrigerant outlet liquid meet the defrosting exit condition, controlling to stop heating.
In the process of heating the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner, the time for stopping heating and quitting defrosting of the air conditioner is comprehensively judged by utilizing two parameters of the outdoor coil temperature and the refrigerant liquid outlet temperature of the outdoor heat exchanger. The temperature of the outdoor coil pipe can reflect the temperature change conditions of refrigerant pipelines at different positions of the outdoor heat exchanger relatively sensitively, and the liquid outlet temperature of the refrigerant can reflect the attenuation condition of the heating performance of the outdoor heat exchanger under the condition of frosting of the air conditioner. Therefore, the defrosting condition of the outdoor heat exchanger is comprehensively judged through two parameters of the outdoor coil temperature and the refrigerant outlet temperature of the outdoor heat exchanger, the control precision of 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≥t02and T is0-T2＜ΔT0
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, T0The initial refrigerant outlet temperature delta T of the outdoor heat exchanger when the air conditioner is started0Is a preset temperature difference threshold value.
Optionally, the first preset temperature is a correction temperature of the outdoor coil after the outdoor heat exchanger completes defrosting in a pre-stored defrosting test process of the air conditioner. 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 first preset duration is in a value range of [2s, 5s ] (s: s), for example, 2s, 3s, 4s, 5 s; the second preset duration is in a range of [2s, 5s ], for example, 2s, 3s, 4s, 5 s.
The defrosting condition of the outdoor heat exchanger can be reflected by the temperature difference between the initial refrigerant liquid outlet temperature when the air conditioner is started and the real-time liquid outlet temperature of the outdoor heat exchanger. When the air conditioner is started, the initial refrigerant outlet temperature of the outdoor heat exchanger is the refrigerant outlet temperature when the outdoor heat exchanger is frostless or frostless, so that the smaller the temperature difference between the initial refrigerant outlet temperature when the air conditioner is started and the refrigerant outlet temperature of the outdoor heat exchanger is, the smaller the frosting amount of the outdoor heat exchanger is, and the more thorough the defrosting is.
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 difference between the initial refrigerant outlet temperature when the air conditioner is started and the real-time outlet temperature of the outdoor heat exchanger is smaller than the preset temperature difference threshold value, the heating performance of the outdoor heat exchanger is further reflected to be restored to the state when the outdoor heat exchanger is started, and the outdoor heat exchanger is relatively thoroughly defrosted. 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 the air conditioner to quit defrosting is comprehensively judged by using two parameters, namely the coil temperature of the outdoor heat exchanger and the refrigerant outlet temperature, 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 defrosting operation of the air conditioner comprises the step of controlling the heating of the refrigerant flowing through the refrigerant liquid inlet pipeline and the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can be effectively increased, the frost condensed on the outdoor heat exchanger is melted by the heat of the refrigerant, and the temperature of the refrigerant flowing back to the compressor can also be increased, thereby improving the heating efficiency and reducing the adverse effect of the frost condensation on the heating performance of the air conditioner.
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: and judging whether the air conditioner needs to be defrosted or not.
S202: and under the condition that the air conditioner needs defrosting, determining a first heating parameter for heating according to the temperature difference between the refrigerant inlet temperature of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger.
Optionally, the first heating parameter comprises a first target heating rate or a first target heating duration.
Optionally, a third temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the third temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the refrigerant inlet line of the outdoor heat exchanger. Therefore, the refrigerant inlet temperature of the outdoor heat exchanger obtained in step S202 may be the real-time temperature of the refrigerant detected by the third 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.
The difference between the refrigerant inlet temperature of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger is small, so that the heat absorption and temperature rise efficiency of the refrigerant is low, the frosting degree of the outdoor heat exchanger of the air conditioner is serious, the first target heating rate needs to be increased, the first target heating time length needs to be increased, the first target heating interruption time length needs to be shortened, and the defrosting is accelerated; the temperature difference between the refrigerant inlet temperature of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger is large, so that the refrigerant heat absorption and temperature rise efficiency is high, the frosting degree of the air-conditioning outdoor heat exchanger is low, the first target heating rate can be properly reduced, the first target heating time duration is shortened, the first target heating interruption time duration is increased, and the energy-saving effect is achieved. Therefore, the first heating parameter for heating can be determined according to the temperature difference between the refrigerant inlet temperature and the refrigerant outlet temperature of the outdoor heat exchanger.
Optionally, according to the temperature difference, a corresponding first heating rate is obtained from the first heating rate correlation, and the first heating rate is used as a first target heating rate.
The first heating rate correlation includes a correspondence of one or more temperature differences to the first heating rate. For example, table 1 shows a correspondence of an optional temperature difference to a first heating rate (where Δ T ═ T)2-T3Delta T is the temperature difference between the refrigerant inlet temperature and the refrigerant outlet temperature of the outdoor heat exchanger, T3Refrigerant inlet temperature of outdoor heat exchanger):
table 1: first heating rate correlation
| Temperature difference (Unit:. degree. C.) | First heating Rate (Unit:. degree. C/min) |
| a11＜ΔT≤a12 | V11 |
| a12＜ΔT≤a13 | V12 |
| a13＜ΔT | V13 |
In the first heating rate correlation, the first heating rate is inversely related to the temperature difference. That is, the larger the temperature difference, the smaller the first heating rate; the smaller the temperature difference, the larger the first heating rate.
Optionally, according to the temperature difference, a corresponding first heating duration is obtained from the first heating duration correlation, and the first heating duration is used as a first target heating duration.
The first heating duration correlation includes a correspondence of one or more temperature differences to the first heating duration. For example, table 2 shows an alternative temperature difference versus first heating time period:
table 2: correlation of first heating time length
| Temperature difference (Unit:. degree. C.) | First heating time (unit: min) |
| a11＜ΔT≤a12 | t11 |
| a12＜ΔT≤a13 | t12 |
| a13＜ΔT | t13 |
In the first heating time length correlation relationship, the first heating time length and the temperature difference value are in negative correlation. That is, the larger the temperature difference, the smaller the first heating period; the smaller the temperature difference, the larger the first heating period.
S203: and controlling the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger to be heated according to the first heating parameter.
And after obtaining corresponding first heating parameters (a first target heating rate and a first target heating time length) according to the first heating parameter association relation, heating according to the corresponding first 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.
S204: and determining a second heating parameter for heating according to the superheat degree of the air conditioner.
Optionally, the second heating parameter comprises a second target heating rate or a second target heating 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 outletIs the 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, at the moment, the second target heating rate needs to be improved, the second target heating time length needs to be increased, the second 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 return air temperature of the air conditioner are higher, the second target heating rate can be properly reduced, the second target heating time duration is shortened, the second target heating interruption time duration is increased, the power consumption of the second heating device in operation is reduced, and the use cost of the air conditioner is reduced. Therefore, the second 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 second heating rate is obtained from the second heating rate correlation and is used as a second target heating rate.
The second heating rate correlation includes a correspondence of one or more degrees of superheat to the second heating rate. For example, table 3 shows an alternative superheat versus second heating rate relationship:
table 3: second heating rate correlation
| Degree of superheat (unit:. degree. C.) | Second heating Rate (Unit:. degree. C/min) |
| a21＜SC≤a22 | V21 |
| a22＜SC≤a23 | V22 |
| a23＜SC | V23 |
In the second heating rate correlation, the second heating rate is positively correlated with the degree of superheat. That is, the greater the degree of superheat, the greater the second heating rate; the smaller the degree of superheat, the smaller the second heating rate.
Optionally, according to the degree of superheat, a corresponding second heating duration is obtained from the second heating duration correlation, and the second heating duration is used as a second target heating duration.
The second heating time period correlation includes a correspondence between one or more degrees of superheat and the second heating time period. For example, table 4 shows an alternative superheat to second heating period:
table 4: second heating time period correlation
| Degree of superheat (unit:. degree. C.) | Second heating time (unit: min) |
| a21＜SC≤a22 | t21 |
| a22＜SC≤a23 | t22 |
| a23＜SC | t23 |
In the correlation relationship of the second heating time, the second heating time is positively correlated with the degree of superheat. That is, the larger the degree of superheat, the larger the second heating period; the smaller the degree of superheat, the smaller the second heating period.
S205: and controlling the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger to be heated according to the second heating parameter.
And after obtaining corresponding second heating parameters (a second target heating rate and a second target heating time length) according to the second heating parameter association relation, heating according to the corresponding second heating parameters. Under the condition of ensuring the normal heating performance 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.
S206: and obtaining the temperature of an outdoor coil of the outdoor heat exchanger and the temperature of the refrigerant outlet liquid of the outdoor heat exchanger.
S207: and judging whether the temperature of the outdoor coil pipe and the temperature of the refrigerant outlet liquid meet defrosting exit conditions or not.
S208: and under the condition that the temperature of the outdoor coil pipe and the temperature of the refrigerant outlet liquid meet the defrosting exit condition, controlling to stop heating.
In this embodiment, the heating device heats the refrigerant to defrost and further improve the heating performance of the air conditioner, which brings extra power consumption to a certain extent. Therefore, under the condition that the temperature of the outdoor coil and the temperature of the refrigerant outlet liquid meet the defrosting exit condition, the heating is controlled to stop, 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;
a first heating device 451 provided on the refrigerant inlet line of the outdoor heat exchanger 41 in the heating mode, and configured to heat the refrigerant flowing through the refrigerant inlet line;
the second heating device 452 is disposed on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 41 in the heating mode, and 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 first heating device 451 and the second heating device 452, respectively.
According to the air conditioner provided by the embodiment, the time for the air conditioner to quit defrosting is comprehensively judged by utilizing two parameters, namely the coil temperature of the outdoor heat exchanger and the refrigerant outlet temperature, so that the control precision for controlling the air conditioner to quit defrosting can be effectively improved; and through the heating operation to the refrigerant that flows through refrigerant inlet pipe way and refrigerant outlet pipe way, can enough effectively improve the refrigerant temperature of inflow outdoor heat exchanger, and then utilize the refrigerant heat to melt the frost of condensing on the outdoor heat exchanger, also can improve the refrigerant temperature who flows back to the compressor to promote heating efficiency, reduce the adverse effect of frost condensation to air conditioner self heating performance.
The 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 the heating of the refrigerant flowing through a refrigerant liquid inlet pipeline and a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner;
obtaining the temperature of an outdoor coil of the outdoor heat exchanger and the temperature of the refrigerant outlet liquid of the outdoor heat exchanger;
under the condition that the temperature of the outdoor coil pipe and the temperature of the refrigerant outlet liquid meet defrosting exit conditions, controlling to stop heating;
the defrosting exit condition is as follows:
T1≥T01，t1≥t01，T2≥T02，t2≥t02and T is0-T2＜ΔT0
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, T0For the initial refrigerant outlet temperature, delta T, of the outdoor heat exchanger when the air conditioner is started0Is a preset temperature difference threshold value.
2. The method as claimed in claim 1, wherein controlling the heating of the refrigerant flowing through the refrigerant inlet line of the outdoor heat exchanger comprises:
determining a first heating parameter for heating according to a temperature difference value between the refrigerant inlet temperature of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger;
controlling the refrigerant flowing through the refrigerant liquid inlet pipeline of the outdoor heat exchanger to be heated according to the first heating parameter;
wherein the first heating parameter comprises a first target heating rate or a first target heating duration.
3. The control method of claim 2, wherein determining the first target heating rate according to a temperature difference between a refrigerant inlet temperature of the outdoor heat exchanger and a refrigerant outlet temperature of the outdoor heat exchanger comprises:
acquiring a corresponding first heating rate from a first heating rate association relation according to the temperature difference;
taking the first heating rate as the first target heating rate.
4. The control method of claim 2, wherein determining the first target heating time period according to a temperature difference between a refrigerant inlet temperature of the outdoor heat exchanger and a refrigerant outlet temperature of the outdoor heat exchanger comprises:
acquiring corresponding first heating time length from the incidence relation of the first heating time length according to the temperature difference;
taking the first heating period as the first target heating period.
5. The method as claimed in claim 1, wherein controlling the heating of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger comprises:
determining a second heating parameter for heating according to the superheat degree of the air conditioner;
controlling the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger to be heated according to the second heating parameter;
wherein the second heating parameter comprises a second target heating rate or a second target heating duration.
6. The control method according to claim 5, wherein determining the second target heating rate based on the degree of superheat includes:
acquiring a corresponding second heating rate from a second heating rate association relation according to the superheat degree;
taking the second heating rate as the second target heating rate.
7. The control method according to claim 5, wherein determining the second target heating period based on the degree of superheat includes:
acquiring corresponding second heating time length from a second heating time length incidence relation according to the superheat degree;
taking the second heating period as the second target heating period.
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 first heating device is arranged on a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat a refrigerant flowing through the refrigerant liquid inlet pipeline;
the second heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
a control apparatus for defrosting an air conditioner in accordance with claim 8, electrically connected to said first heating means and said second heating means, respectively.
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