CN110469993A - For the control method of air-conditioner defrosting, device and air-conditioning - Google Patents
For the control method of air-conditioner defrosting, device and air-conditioning Download PDFInfo
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- CN110469993A CN110469993A CN201910686068.2A CN201910686068A CN110469993A CN 110469993 A CN110469993 A CN 110469993A CN 201910686068 A CN201910686068 A CN 201910686068A CN 110469993 A CN110469993 A CN 110469993A
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- 238000010257 thawing Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000004378 air conditioning Methods 0.000 title abstract description 6
- 239000003507 refrigerant Substances 0.000 claims abstract description 90
- 238000010438 heat treatment Methods 0.000 claims abstract description 57
- 230000008569 process Effects 0.000 claims abstract description 19
- 230000009467 reduction Effects 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims 6
- 230000000875 corresponding effect Effects 0.000 claims 4
- 230000002596 correlated effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 230000002411 adverse Effects 0.000 abstract description 7
- 230000005494 condensation Effects 0.000 abstract description 5
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001816 cooling 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
- 238000007791 dehumidification Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
This application involves air-conditioner defrosting technical fields, disclose a kind of control method for air-conditioner defrosting.Control method includes: refrigerant feed liquor temperature, outdoor coil temperature and the upper casing temperature that outdoor heat exchanger is obtained in the operation of air conditioner heating mode processes；After determining satisfaction defrosting entry condition according to the refrigerant feed liquor temperature, outdoor coil temperature and upper casing temperature, controls and frequency redution operation is carried out to the compressor of the air-conditioning.Whether the control method can meet the judgement of defrosting entry condition according to refrigerant feed liquor temperature, outdoor coil temperature and the upper casing temperature of outdoor heat exchanger to air-conditioning, improve the control precision to control air-conditioner defrosting；And the heat exchange amount of outdoor heat exchanger and outdoor environment is reduced by the frequency redution operation to compressor, improve the frosting situation of outdoor heat exchanger, to reduce frost condensation to the adverse effect of air-conditioning itself heating performance.A kind of control device and air-conditioning for air-conditioner defrosting is also disclosed in the application.
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 refrigeration and refrigeration double mode, and here, under a low-temperature area or a climate condition with large wind and snow, a user generally adjusts the air conditioner to a heating mode so as to utilize the air conditioner to increase the temperature of an indoor environment; in the operation and heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit plays a role of an evaporator absorbing heat from the outdoor environment, and is affected by the temperature and the humidity of the outdoor environment, more frost is easily condensed on the outdoor heat exchanger, and the heating capacity of the air conditioner is lower and lower when the frost is condensed to a certain thickness, so that the outdoor heat exchanger needs to be defrosted in order to ensure the heating effect and avoid excessive frost condensation.
Here, the 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 process of the defrosting mode of the outdoor heat exchanger shown in the embodiment has more or less influence on the normal heating performance of the air conditioner, the air conditioner carries out defrosting judgment before defrosting, and then controls whether the air conditioner carries out defrosting according to the judgment result; in the related art, defrosting judgment is generally performed by comparing numerical values between outdoor environment temperature and frost point temperature, and because a frosting device of an outdoor heat exchanger is influenced by various factors such as outdoor environment, self running state and the like, the defrosting judgment mode is too rough, and the requirement of an air conditioner for accurately triggering defrosting action is difficult to meet.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for air conditioner defrosting and an air conditioner, and aims to solve the technical problem of low air conditioner defrosting judgment accuracy in the related art.
In some embodiments, the control method for defrosting an air conditioner includes:
acquiring the refrigerant inlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell in the process of the air conditioner running heating mode;
and after the condition of meeting the defrosting entry condition is determined according to the refrigerant liquid inlet temperature, the temperature of the outdoor coil and the temperature of the upper shell, controlling the compressor of the air conditioner to perform frequency reduction operation.
In some embodiments, the control device for defrosting an air conditioner includes:
a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform a control method for air conditioner defrosting as described in some embodiments above.
In some embodiments, the air conditioner includes:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the control device for defrosting an air conditioner, as described in some embodiments above, is electrically connected to the compressor.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve the following technical effects:
the control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired refrigerant liquid inlet temperature of the outdoor heat exchanger, the outdoor coil temperature and the upper shell temperature, so that the control precision for controlling the air conditioner to defrost can be effectively improved; and the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, so that the adverse effects of temperature factors such as too low temperature on the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are reduced, the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are 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 of a control method for defrosting an air conditioner according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
Fig. 1 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
As shown in fig. 1, an embodiment of the present disclosure provides a control method for defrosting an air conditioner, which can be used to solve the problem that when the air conditioner operates in rain and snow or under low-temperature and severe cold conditions, an outdoor heat exchanger frosts and affects the normal heating performance of the air conditioner; in an embodiment, the main flow steps of the control method include:
s101, in the process of an air conditioner running heating mode, obtaining the refrigerant liquid inlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell;
in an embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a severe working condition with a low temperature and a high humidity, and at this time, a user generally sets the air conditioner to operate in a heating mode so as to heat and raise the temperature of the indoor environment by using the air conditioner. Therefore, the control method for defrosting the air conditioner provided by the embodiment of the disclosure is a control flow which is started when the air conditioner operates in a heating mode.
When the air conditioner operates in other modes such as a cooling mode and a dehumidification mode, because the problem of frosting of the outdoor unit of the air conditioner generally does not occur under the outdoor working conditions corresponding to the modes, optionally, when the air conditioner operates in other non-heating modes, the flow control process corresponding to the control method is not started, so that the situation that the defrosting action aiming at the outdoor heat exchanger is mistakenly triggered in the modes such as the cooling mode and the dehumidification mode of the air conditioner is avoided, and the normal cooling or dehumidification working process of the air conditioner is influenced is avoided.
In an optional embodiment, the outdoor unit of the air conditioner is further provided with a first temperature sensor, and the first temperature sensor can be used for detecting the real-time temperature of the refrigerant flowing through the refrigerant inlet pipeline of the outdoor heat exchanger; therefore, the liquid inlet temperature of the refrigerant obtained in step S101 may be the real-time temperature of the refrigerant detected by the first temperature sensor;
here, the refrigerant liquid inlet line is a line through which the refrigerant flows into the outdoor heat exchanger when the air conditioner operates in the heating mode.
In the embodiment of the present disclosure, the flow sequence of the refrigerant discharged from the compressor in the refrigerant circulation loop in the heating mode is as follows: the air flows through the indoor heat exchanger, then flows through the throttling device for throttling, then flows into the outdoor heat exchanger, and finally flows back to the compressor. Before the refrigerant flows into the outdoor heat exchanger, the temperature of the refrigerant is gradually reduced under the combined influence of the heat exchange process of the indoor heat exchanger and the throttling action of the throttling device; under different outdoor working conditions, the temperature of the refrigerant flowing into the outdoor heat exchanger is obviously different; for example, when the air conditioner has a frosting problem, the temperature of the refrigerant discharged by the compressor is lower than that of the refrigerant without frosting, meanwhile, the indoor environment is influenced by the outdoor severe environment, and the heat released by the refrigerant after flowing through the indoor heat exchanger is more, so that the temperature of the refrigerant finally flowing into the outdoor heat exchanger is a relatively low value, and the refrigerant inlet temperature reflects the frosting condition of the air conditioner from the side.
In an optional embodiment, a second temperature sensor is arranged at the coil position of an outdoor heat exchanger of the outdoor unit of the air conditioner, and the second temperature sensor can be used for detecting the real-time temperature of the coil position of the second temperature sensor; thus, the first outdoor coil temperature acquired in step S101 may be the real-time temperature of the coil position detected by the second temperature sensor.
In the embodiment of the disclosure, the temperature change of the coil pipe position of the outdoor heat exchanger can visually reflect the temperature change condition of the refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor environment temperature and the internal refrigerant temperature, and is also a pipeline part of the outdoor heat exchanger, which is easy to cause the frosting problem; therefore, the acquired temperature of the first outdoor coil can be used as a reference factor for measuring the frosting influence of the interior and the exterior of the air conditioner on the outdoor heat exchanger.
In an alternative embodiment, the outdoor unit of the air conditioner is further provided with a third temperature sensor, and the third temperature sensor can be used for detecting the real-time temperature of the refrigerant pipeline flowing through the upper shell or the upper part of the outdoor heat exchanger; therefore, the upper case temperature acquired in step S101 may be a real-time temperature detected by the third temperature sensor;
in this embodiment, the refrigerant liquid inlet pipeline of the outdoor heat exchanger is disposed at the lower portion, and the refrigerant liquid outlet pipeline of the outdoor heat exchanger is disposed at the upper portion, so that the refrigerant flows into the outdoor heat exchanger from the lower portion and flows out of the outdoor heat exchanger from the upper portion in the heating mode; therefore, the temperature of the upper shell is influenced by the temperature of the refrigerant which flows through most pipelines of the outdoor heat exchanger and exchanges heat with the outdoor environment, and the heat exchange efficiency of the refrigerant under different frosting conditions can be reflected; under the condition that the air conditioner is not frosted, the refrigerant absorbs more heat from the outdoor environment, so the temperature of the upper shell influenced by the refrigerant is higher; in the case of frost formation in the air conditioner, the refrigerant absorbs less heat from the outdoor environment, and therefore the upper 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.
And S102, controlling the compressor of the air conditioner to perform frequency reduction operation after the condition of meeting the defrosting entry condition is determined according to the refrigerant liquid inlet temperature, the outdoor coil temperature and the upper shell temperature.
The air conditioner is preset with a defrosting entry condition, and whether the air conditioner meets the defrosting entry condition can be judged according to the acquired parameters when the air conditioner operates in a heating mode; if so, the air conditioner needs to defrost the outdoor heat exchanger; if not, the air conditioner does not need to defrost the outdoor heat exchanger.
In the embodiment of the present disclosure, the air conditioner determines whether the defrosting entry condition is satisfied according to the three parameters of the first refrigerant liquid inlet temperature, the outdoor coil temperature, and the upper shell temperature of the outdoor heat exchanger, which are obtained in step S101; therefore, the embodiment of the disclosure integrates the three factor parameters to judge whether the air conditioner has the frosting problem, and can greatly improve the judgment precision of the air conditioner defrosting, so that the defrosting operation triggered by the air conditioner can better accord with the real-time frosting condition of the air conditioner.
In an alternative embodiment, the defrost entry condition in step S102 includes:
T1-Tfeeding liquid≥△T1，T2-Te≥△T2，TUpper casing max-TUpper shell≥△T3；
Wherein, TFeeding liquidIs the refrigerant inlet temperature, T, of the refrigerant flowing through the refrigerant inlet lineeT1 is the initial refrigerant inlet temperature when the air conditioner is started, T2 is the initial outdoor coil temperature when the air conditioner is started, TUpper casing maxThe maximum value of the temperature of the upper shell, T, of the outdoor heat exchanger recorded after the air conditioner is started up and operated at this timeUpper shellThe temperature of the upper shell of the outdoor heat exchanger is shown as delta T1, delta T2 and delta T3, wherein the delta T1 is a preset first temperature difference threshold value, the delta T2 is a preset second temperature difference threshold value, and the delta T3 is a preset third temperature difference threshold value.
In the defrosting entry condition, T1 is the initial refrigerant inlet temperature when the air conditioner is turned on. When the air conditioner starts to operate, the frosting problem generally does not exist, so the detected liquid inlet temperature of the refrigerant can reflect the temperature state of the refrigerant when the air conditioner normally works under the condition of no frosting; furthermore, the influence of different frosting degrees of the air conditioner on the temperature of the refrigerant in the refrigerant circulation loop can be explained by the temperature difference between the initial refrigerant liquid inlet temperature and the first refrigerant liquid inlet temperature.
The temperature difference between the temperature of the outdoor coil and the initial temperature of the outdoor coil can reflect the change condition of the temperature of the outdoor coil under the joint influence of the internal environment and the external environment of the air conditioner; generally, when the outdoor environment has good working condition and the air conditioner is in normal operation for heating, the variation of the outdoor coil temperature compared with the initial outdoor coil temperature is limited; when the outdoor environment is changed into a severe working condition which easily causes the frost condensation of the outdoor heat exchanger, the temperature of the outdoor coil pipe is quickly reduced under the influence of the temperature change of the outdoor environment, so that the variation of the outdoor coil pipe temperature is larger than that of the original outdoor coil pipe temperature; thus, one of the defrosting entry conditions of the defrosting device is to judge defrosting according to the temperature of the outdoor coil under different outdoor working conditions.
In addition, the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature of the outdoor heat exchanger, which are recorded after the air conditioner is started and operated at this time, can reflect the heat absorption efficiency of the refrigerant in the outdoor heat exchanger under different frosting conditions, so that the maximum value of the upper shell temperature of the outdoor heat exchanger and the upper shell temperature of the outdoor heat exchanger can also be used as parameters for judging the frosting degree of the air conditioner.
Therefore, the defrosting entry condition in the embodiment of the disclosure comprehensively considers the influence of the parameters on the frosting of the outdoor heat exchanger under different working conditions, so that the judgment precision of the air conditioner defrosting can be effectively improved, and the problems of misjudgment, mistriggering and the like are reduced.
In the embodiment of the disclosure, after it is determined that the defrosting entry condition is satisfied according to the refrigerant liquid inlet temperature, the outdoor coil temperature and the upper shell temperature, the defrosting operation of the air conditioner includes controlling the frequency reduction operation of a compressor of the air conditioner.
In an embodiment, by reducing the operating frequency of the compressor of the air conditioner, the heat absorption rate of the refrigerant in the outdoor heat exchanger can be reduced, and then adverse effects of further temperature reduction and increased frosting degree of the outdoor heat exchanger caused by heat absorption of the refrigerant can be weakened, so that the defrosting effect of the air conditioner in defrosting operation of heating the refrigerant in the refrigerant liquid inlet pipeline and the refrigerant in the refrigerant liquid outlet pipeline is improved.
Here, after the air conditioner exits defrosting, the operating frequency of the air conditioner compressor can be controlled to be recovered so as to meet the frequency requirement of normal heating operation of the air conditioner after exiting defrosting.
In some alternative embodiments, controlling the down-conversion operation of the compressor of the air conditioner includes: acquiring a corresponding frequency reduction value according to the temperature difference; the down-conversion operation is performed according to the down-conversion value based on the current operating frequency of the compressor.
Wherein the temperature difference comprises: a first temperature difference between the initial refrigerant charge temperature and the refrigerant charge temperature, or a second temperature difference between the maximum upper case temperature and the upper case temperature.
In the above technical context, the first temperature difference and the second temperature difference are one of the sub-conditions of the preceding defrost entry condition; therefore, when it is determined in step S102 that the defrosting entry condition is satisfied, the frosting degree of the outdoor heat exchanger can be estimated according to the first temperature difference and the second temperature difference, and then the frequency reduction value for adjusting the frequency of the compressor is selected according to the frosting degree, so as to satisfy the defrosting requirement of the air conditioner.
For example, when the frosting degree of the outdoor heat exchanger is high, the attenuation of the thermal performance of the air conditioner is high, and the frequency reduction value of the compressor is set to be high; on the contrary, when the frosting degree of the outdoor heat exchanger is low, the cost is set.
Optionally, obtaining a corresponding down-conversion value according to the temperature difference includes: and acquiring a corresponding first frequency reduction value from the first incidence relation according to the first temperature difference so as to perform frequency reduction operation according to the first frequency reduction value.
Here, the first correlation includes a correspondence between one or more first temperature difference values and the first down conversion values. An alternative first temperature difference versus first downconversion frequency is shown, for example, in table 1, which, as shown below,
| first temperature difference (Unit:. degree. C.) | First frequency reduction value (Unit: Hz) |
| a1＜T1-TFeeding liquid≤a2 | h11 |
| a2＜T1-TFeeding liquid≤a3 | h12 |
| a3＜T1-TFeeding liquid | h13 |
TABLE 1
In the first correlation, the first down-conversion value and the first temperature difference are in negative correlation. Namely, the larger the first temperature difference is, the smaller the first frequency reduction value is; the smaller the first temperature difference is, the larger the first down conversion value is.
Therefore, when the frequency-reducing operation of the compressor in step S102 is performed, a first frequency-reducing value corresponding to the first temperature difference may be determined according to the first association relationship, and then the frequency may be adjusted according to the first frequency-reducing value.
Optionally, obtaining the corresponding down conversion value according to the temperature difference includes: and acquiring a corresponding second frequency reduction value from the second incidence relation according to the second temperature difference so as to perform frequency reduction operation according to the second frequency reduction value.
Here, the second correlation includes one or more corresponding relationships between the second temperature difference and the second down conversion value. An alternative second temperature difference versus second down-conversion value is shown, for example, in table 2, which, as shown below,
| second temperature difference (Unit:. degree. C.) | Second lower frequency value (Unit: Hz) |
| b1＜TUpper casing max-TUpper shell≤b2 | h21 |
| b2＜TUpper casing max-TUpper shell≤b3 | h22 |
| b3＜TUpper casing max-TUpper shell | h23 |
TABLE 2
In the second correlation, the second down-frequency value and the second temperature difference are in negative correlation. Namely, the larger the second temperature difference is, the smaller the second frequency reduction value is; and the smaller the second temperature difference is, the larger the second down conversion value is.
Therefore, when the frequency-reducing operation of the compressor in step S102 is performed, the second frequency-reducing value corresponding to the second temperature difference may be determined according to the second correlation, and then the frequency may be adjusted according to the second frequency-reducing value.
In the above embodiment, since the degree of frosting of the outdoor heat exchanger has different influences on the thermal performance of the air conditioner, and further has different influences on the temperature change of the first temperature difference and the second temperature difference, the air conditioner is respectively provided with a separate association relationship, and the air conditioner can select one of the association relationships to determine the corresponding heating rate according to actual needs.
Optionally, the specifically selected association relationship may also be determined according to the heating requirement of the current user, for example, when the heating requirement of the current user is low, the second association relationship is selected, and at this time, the influence of the change of the outdoor unit parameters such as the upper casing temperature corresponding to the second temperature difference value on the defrosting effect is mainly considered; and when the heating demand of the current user is higher, the first incidence relation is selected, and the change condition of the heat exchange efficiency of the refrigerant between the indoor heat exchanger and the indoor environment caused by the frosting influence of the outdoor heat exchanger is mainly considered at the moment so as to ensure the heating performance.
Here, the negative correlation ratio in the first correlation is smaller than that in the second correlation. That is, under the condition of the same value of temperature difference, the corresponding first frequency reduction value in the first association relationship is smaller than the corresponding second frequency reduction value in the second association relationship.
Here, the heating demand of the current user may be determined by setting a target heating temperature for the air conditioner; for example, a heating temperature threshold is preset in the air conditioner, and when the target heating temperature actually set by the user is smaller than the heating temperature threshold, it indicates that the heating demand of the user is low at this time; and when the target heating temperature actually set by the user is greater than or equal to the heating temperature threshold, the heating requirement of the user is high or low at the moment.
Therefore, the defrosting operation of the air conditioner on the outdoor heat exchanger can be timely triggered according to the actual frosting condition of the air conditioner, and the heating requirement of a user can be taken into consideration when the defrosting operation of the compressor frequency reduction operation is executed, so that the control requirement of the air conditioner on the comfort level of the user in the defrosting process is fully guaranteed.
In still other alternative embodiments, after controlling the compressor of the air conditioner to perform the frequency reduction operation, the method further includes: and controlling and reducing the rotating speed of an indoor fan of the air conditioner.
In the embodiment, the rotating speed of the indoor fan of the air conditioner is reduced, so that the heat exchange rate between the indoor heat exchanger and the indoor environment can be reduced, more heat can be reserved for the refrigerant flowing into the outdoor heat exchanger after the indoor heat exchanger flows out, the defrosting effect of the outdoor heat exchanger by using the heat of the refrigerant can be improved, and the running power consumption of the heating device for heating the refrigerant can also be reduced.
In still other alternative embodiments, after controlling the compressor of the air conditioner to perform the frequency reduction operation, the method further includes: and controlling to shut down an outdoor fan of the air conditioner.
In the embodiment, by shutting down the outdoor fan, the heat exchange rate between the outdoor heat exchanger and the outdoor environment can be reduced, the adverse temperature influence of the low-temperature condition of the outdoor environment on the frosting of the outdoor heat exchanger is reduced, and the heat dissipation of the refrigerant heat for defrosting is reduced, so that the actual defrosting effect in the defrosting process is ensured.
Fig. 2 is a flowchart illustrating a control method for defrosting an air conditioner according to another embodiment of the present disclosure.
As shown in fig. 2, the embodiment of the present disclosure provides another control method for defrosting an air conditioner, and the control steps mainly include:
s201, starting an air conditioner and operating in a heating mode;
in this embodiment, a general user of the air conditioner sets the heating mode to be the current mode for starting up operation under the condition of low temperature and severe cold weather.
S202、Detecting outdoor coil temperature T of indoor uniteRefrigerant feed temperature TFeeding liquidAnd the upper shell temperature T of the outdoor heat exchangerUpper shell；
S203, judging whether T1-T exists or notFeeding liquid≥△T1，T2-Te≥△T2，TUpper casing max-TUpper shellΔ T3, if yes, executing step S204, if no, returning to execute step S202;
in the disclosed embodiment, T1-TFeeding liquid≥△T1，T2-Te≥△T2，TUpper casing max-TUpper shellΔ T3 together constitute the preset defrost entry condition.
After the air conditioner is started to operate, the temperature sensor detects the temperature of the upper shell in real time, and the detected temperatures of the plurality of upper shells are used as historical data to be stored; therefore, when the determination step of step S203 is executed, a plurality of upper casing temperatures in the history data may be retrieved, and the maximum value T of the upper casing temperature may be determined by comparisonUpper casing max；
If the defrosting entry condition is met, the problem that the outdoor heat exchanger of the air conditioner frosts at the moment is solved; and if the defrosting entering condition is not met, the problem that the outdoor heat exchanger of the air conditioner is frosted does not exist at the moment.
S204, according to T1-TFeeding liquidAcquiring a corresponding first frequency reduction value from the first incidence relation;
in the embodiment of the present disclosure, reference may be made to the foregoing embodiment for a specific implementation manner of step S204, which is not described herein again.
S205, performing frequency reduction operation on the compressor according to the first frequency reduction value; the flow ends.
The control method for defrosting the air conditioner can comprehensively judge whether the air conditioner meets defrosting entry conditions according to the acquired parameters of the refrigerant liquid inlet temperature, the outdoor coil temperature and the upper shell temperature, so that the control precision for controlling the defrosting of the air conditioner can be effectively improved; and the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, so that the adverse effects of temperature factors such as too low temperature on the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are reduced, the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
In some optional embodiments, after controlling the compressor to perform the down-conversion operation, the method further includes: acquiring state parameters in the process of operating a heating mode of an air conditioner; and after the condition that the defrosting exit condition is met is determined according to the state parameters, controlling the compressor to be switched to the heating working frequency.
Here, the state parameters during the air conditioner operation heating mode are at least one or more of the following parameter types: outdoor environment temperature, refrigerant inlet temperature, refrigerant outlet temperature and outdoor coil temperature. It should be understood that the status parameters obtained in the present application are not limited to the types of parameters shown in the above embodiments.
Correspondingly, the defrosting exit condition is preset according to the specifically obtained parameter type, generally, when the air conditioner meets the defrosting exit condition, the defrosting of the outdoor heat exchanger is finished, no frost or only a small amount of frost exists on the outdoor heat exchanger, and the influence on the normal heating performance of the air conditioner is low; for example, when the parameter type is the outdoor ambient temperature, an optional defrost exit condition is that the outdoor ambient temperature is greater than or equal to a preset outer loop temperature threshold.
Judging whether the defrosting exit condition is met or not according to the outdoor environment temperature after the outdoor environment temperature is obtained; if yes, controlling and recovering the heating working frequency of the compressor; if not, the current operation state is maintained unchanged.
In the embodiment of the disclosure, in the process of controlling the frequency reduction operation on the compressor, the air conditioner performs the judgment operation on the defrosting exit condition in real time according to the parameters of the air conditioner, so as to stop the compressor from running at the frequency after frequency reduction under the condition that the defrosting exit condition is met, and thus the working frequency of the air conditioner in the normal heating state can be switched back in time, so as to reduce the influence of the defrosting operation on the normal heating operation of the air conditioner.
In some optional embodiments, after controlling the compressor to perform the down-conversion operation, the method further includes: acquiring state parameters in the process of operating a heating mode of an air conditioner; and after the condition that the defrosting exit condition is met is determined according to the state parameters, controlling the compressor to be switched to the heating working frequency.
Here, the state parameters during the air conditioner operation heating mode are at least one or more of the following parameter types: outdoor environment temperature, refrigerant inlet temperature, refrigerant outlet temperature and outdoor coil temperature. It should be understood that the status parameters obtained in the present application are not limited to the types of parameters shown in the above embodiments.
Correspondingly, the defrosting exit condition is preset according to the specifically obtained parameter type, generally, when the air conditioner meets the defrosting exit condition, the defrosting of the outdoor heat exchanger is finished, no frost or only a small amount of frost exists on the outdoor heat exchanger, and the influence on the normal heating performance of the air conditioner is low; for example, when the parameter type is the outdoor ambient temperature, an optional defrost exit condition is that the outdoor ambient temperature is greater than or equal to a preset outer loop temperature threshold.
Judging whether the defrosting exit condition is met or not according to the outdoor environment temperature after the outdoor environment temperature is obtained; if yes, controlling and recovering the heating working frequency of the compressor; if not, the current operation state is maintained unchanged.
In the embodiment of the disclosure, in the process of controlling the frequency reduction operation on the compressor, the air conditioner performs the judgment operation on the defrosting exit condition in real time according to the parameters of the air conditioner, so as to stop the compressor from running at the frequency after frequency reduction under the condition that the defrosting exit condition is met, and thus the working frequency of the air conditioner in the normal heating state can be switched back in time, so as to reduce the influence of the defrosting operation on the normal heating operation of the air conditioner.
Fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting of an air conditioner, which is structurally shown in fig. 3 and includes:
a processor (processor)300 and a memory (memory)301, and may further include a Communication Interface 302 and a bus 303. The processor 300, the communication interface 302 and the memory 301 may communicate with each other via a bus 303. The communication interface 302 may be used for information transfer. The processor 300 may call logic instructions in the memory 301 to perform the control method for defrosting the air conditioner of the above-described embodiment.
In addition, the logic instructions in the memory 301 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 301 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 300 executes functional applications and data processing by executing program instructions/modules stored in the memory 301, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 301 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 301 may include a high-speed random access memory, and may also include a nonvolatile memory.
The disclosed implementation also provides an air conditioner, including:
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;
and the control device for defrosting of the air conditioner is electrically connected with the compressor. Here, the control device for air conditioner defrosting is the control device shown in the foregoing embodiment.
The air conditioner in the embodiment of the disclosure can accurately detect and judge whether the air conditioner has the frosting problem or not, and under the condition that the frosting problem exists in the air conditioner, utilize foretell controlling means and compressor to carry out corresponding defrosting operation to reduce the frost amount of condensing on the outdoor heat exchanger of air conditioner, guarantee that the air conditioner can normally heat the indoor environment under the low temperature severe cold climate condition, promote user's use and experience.
Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.
Embodiments of the present disclosure also provide a computer program product comprising a computer program stored on a computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described method for defrosting an air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the 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 (10)
1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
acquiring the refrigerant inlet temperature of an outdoor heat exchanger, the temperature of an outdoor coil and the temperature of an upper shell in the process of the air conditioner running heating mode;
and after the condition of meeting the defrosting entry condition is determined according to the refrigerant liquid inlet temperature, the temperature of the outdoor coil and the temperature of the upper shell, controlling the compressor of the air conditioner to perform frequency reduction operation.
2. The control method of claim 1, wherein the defrost entry condition comprises:
T1-Tfeeding liquid≥△T1，T2-Te≥△T2，TUpper casing max-TUpper shell≥△T3；
Wherein, T isFeeding liquidIs the refrigerant inlet temperature of the refrigerant flowing through the refrigerant inlet pipeline, TeIs outside the roomThe temperature of the coil pipe, T1 is the initial refrigerant inlet temperature when the air conditioner is started, T2 is the initial outdoor coil pipe temperature when the air conditioner is started, TUpper casing maxThe maximum value of the temperature of the upper shell, T, of the outdoor heat exchanger recorded after the air conditioner is started up and operated at this timeUpper shellThe temperature of the upper shell of the outdoor heat exchanger is shown as delta T1, delta T2 and delta T3, wherein the delta T1 is a preset first temperature difference threshold, the delta T2 is a preset second temperature difference threshold, and the delta T3 is a preset third temperature difference threshold.
3. The control method of claim 2, wherein the controlling down-converts the compressor of the air conditioner, comprising:
acquiring a corresponding frequency reduction value according to the temperature difference; wherein the temperature difference comprises: a first temperature difference between the initial refrigerant feed temperature and the refrigerant feed temperature, or a second temperature difference between the maximum upper shell temperature and the upper shell temperature;
and performing the frequency reduction operation according to the frequency reduction value based on the current running frequency of the compressor.
4. The control method according to claim 3, wherein the obtaining the corresponding down-conversion value according to the temperature difference comprises:
acquiring a corresponding first frequency reduction value from a first incidence relation according to the first temperature difference value, and performing frequency reduction operation according to the first frequency reduction value; or,
and acquiring a corresponding second frequency reduction value from a second incidence relation according to the second temperature difference so as to perform the frequency reduction operation according to the second frequency reduction value.
5. The control method of claim 4, wherein the first correlation is such that the first temperature difference is negatively correlated with the first down conversion;
in the second correlation, the second temperature difference and the second down-frequency value are in negative correlation.
6. The control method according to claim 5, wherein now a negative correlation ratio in the first correlation is smaller than a negative correlation ratio in the second correlation.
7. The control method according to any one of claims 1 to 6, further comprising, after controlling the down-conversion operation of the compressor of the air conditioner:
and controlling to reduce the rotating speed of an indoor fan of the air conditioner.
8. The control method according to any one of claims 1 to 6, further comprising, after controlling the down-conversion operation of the compressor of the air conditioner:
and controlling to shut down an outdoor fan of the air conditioner.
9. 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 8 when executing the program instructions.
10. 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;
a control for defrosting an air conditioner as set forth in claim 9, electrically connected to said compressor.
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