CN110736201A - Control method and control device for defrosting of air conditioner and air conditioner - Google Patents
Control method and control device for defrosting of air conditioner and air conditioner Download PDFInfo
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- CN110736201A CN110736201A CN201910911863.7A CN201910911863A CN110736201A CN 110736201 A CN110736201 A CN 110736201A CN 201910911863 A CN201910911863 A CN 201910911863A CN 110736201 A CN110736201 A CN 110736201A
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- 238000010257 thawing Methods 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000003507 refrigerant Substances 0.000 claims abstract description 184
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims description 151
- 239000007789 gas Substances 0.000 claims description 13
- 230000000875 corresponding effect Effects 0.000 description 17
- 230000006870 function Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
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- 230000006698 induction Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000002596 correlated effect Effects 0.000 description 4
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- 230000003247 decreasing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/60—Arrangement or mounting of the outdoor unit
- F24F1/64—Ceiling-mounted, e.g. below a balcony
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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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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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The control method can control the liquid outlet refrigerant of the outdoor heat exchanger to be heated under the condition that the air conditioner enters the bypass defrosting mode, so that the liquid refrigerant in the liquid outlet refrigerant of the outdoor heat exchanger is heated into gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the gas return refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.
Description
Technical Field
The present application relates to the field of air conditioner defrosting technologies, and for example, to control methods and control devices for air conditioner defrosting, and an air conditioner.
Background
With the development of science and technology, an air conditioner, which is kinds of necessary electrical equipment for ordinary people in daily life, has been gradually developed from the first single-cold machine type to an advanced machine type capable of having more functions of cooling, heating and defrosting, and here, important problems inevitably faced by air conditioning products operating in low-temperature areas or under windy and snowy weather conditions are the frosting problem of an air conditioner outdoor unit, an outdoor heat exchanger of the outdoor unit functions as an evaporator for absorbing heat from the outdoor environment, and is affected by the temperature and humidity of the outdoor environment in winter, much frost is easily condensed on the outdoor heat exchanger, and when the frost is condensed to , the heating capacity of the air conditioner is gradually lowered, so that in order to ensure the heating effect and avoid the frost from being condensed, the defrosting function gradually becomes important research subjects in the air conditioning field.
is a reverse circulation defrosting mode, when the air conditioner carries out reverse circulation defrosting, the high temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger to melt the frost by the heat of the refrigerant, and secondly, the bypass defrosting mode can convey the high temperature refrigerant discharged by the compressor to the outdoor heat exchanger through a bypass branch which is separately arranged when the air conditioner normally heats, and the purpose of melting the frost by the heat of the refrigerant can also be realized.
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:
for the bypass defrosting mode, as a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the refrigerant after heat release is changed from a gaseous state to a liquid state, and meanwhile, the refrigerant evaporation function of the outdoor heat exchanger is inhibited, so that more and more liquid refrigerants and less gaseous refrigerants are contained in the refrigerant circulation loop of the air conditioner, the temperature and the flow of air return and suction of the compressor are reduced due to the step, and finally the defrosting capacity of the whole air conditioner is reduced along with the time.
Disclosure of Invention
This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides control methods and devices for defrosting of an air conditioner and the air conditioner, so as to solve the technical problem that the defrosting capacity of a bypass defrosting mode is reduced with time in the related art.
In embodiments, a control method for defrosting an air conditioner includes:
acquiring a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode; the bypass defrosting mode comprises the step of leading the refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;
and if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
In embodiments, a control apparatus for air conditioner defrosting includes a processor and a memory storing program instructions, the processor configured to execute, upon execution of the program instructions, a control method for air conditioner defrosting as in the previous embodiments .
In embodiments, an 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 defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with a refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode;
the heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting the air conditioner as in the previous embodiments is electrically connected to the control valve and the heating device.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve the following technical effects:
according to the control method for defrosting of the air conditioner, the liquid refrigerant of the outdoor heat exchanger can be heated according to the defrosting attenuation parameter and the heating starting condition under the condition that the air conditioner enters the bypass defrosting mode, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
exemplary embodiments are illustrated by corresponding drawings, which are not to be construed as limiting the embodiments, in which elements having the same reference number designation are illustrated as similar elements, and in which:
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 structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
Detailed Description
In the following description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments, however, or more embodiments may be practiced without these details.
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, control methods for defrosting of an air conditioner are provided in the embodiments of the present disclosure, which can be used to solve the problem that the defrosting capability of the air conditioner gradually decreases after the air conditioner operates in a bypass defrosting mode under rainy or snowy or low-temperature and severe cold conditions, and in the embodiments, the main flow steps of the control method include:
s101, acquiring a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode;
in an embodiment of the present disclosure, the bypass defrosting mode includes guiding the refrigerant discharged from the compressor into the outdoor heat exchanger through the defrosting bypass branch.
The refrigerant discharged from the compressor is a high-temperature refrigerant which is discharged from an exhaust port of the compressor and compressed by the compressor, and the refrigerant carries more heat, so that after the refrigerant is introduced into the outdoor heat exchanger, the heat of the refrigerant can be conducted to the shell of the outdoor heat exchanger, the temperature of the outdoor heat exchanger is increased, ice frost condensed on the outdoor heat exchanger is melted by absorbing heat, and the purpose of defrosting the outdoor heat exchanger is achieved.
In the air-conditioning structures applied in the embodiment of the disclosure, the end of the defrosting bypass branch is connected in parallel to the exhaust port of the compressor, and the other end is connected to the refrigerant inlet end of the outdoor heat exchanger in the heating mode.
In the embodiment of the disclosure, after the air conditioner enters the bypass defrosting mode, the flow direction of the refrigerant defined by the heating mode is still kept unchanged, that is, the heating mode and the bypass defrosting mode of the air conditioner are performed simultaneously, so that parts of the refrigerant discharged by the compressor are used for defrosting, and other parts of the refrigerant can still flow in the refrigerant circulation loop, thereby ensuring the heating and warming effects on the indoor environment defined by the heating mode.
In , the defrost decay parameter obtained in step S101 is the return air parameter of the compressor.
In the process of the bypass defrosting mode in the air conditioner operation step S101, a large amount of refrigerant directly flows to the outdoor to exchange heat for defrosting, the refrigerant after heat release changes from a gaseous state to a liquid state, and the refrigerant evaporation function of the outdoor heat exchanger is inhibited, so that the liquid refrigerant in the refrigerant circulation loop of the air conditioner is increased and the gaseous refrigerant is decreased, and further the return air temperature and the return air flow of the compressor are decreased.
Here, the return air parameter of the compressor includes a return air temperature of the compressor, and/or a return air pressure.
In alternative embodiments of the present disclosure, a temperature sensor is disposed at the air return end of the compressor, and the temperature sensor can be used to detect the real-time temperature of the refrigerant flowing through the air return end of the compressor, so that in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the air return temperature of the compressor.
Similarly, the air return end of the compressor is provided with an pressure sensor, and the pressure sensor can be used for detecting the real-time pressure of the refrigerant flowing through the air return end of the compressor, so that the real-time pressure of the refrigerant detected by the pressure sensor is used as the air return pressure of the compressor in the embodiment of the disclosure.
In another embodiments, the defrost decay parameter obtained in step S101 is the discharge parameter of the compressor.
Here, under the condition that the compression power of the compressor is not changed, when the problem that the return air parameter of the compressor is reduced due to the negative influence of the bypass defrosting mode occurs, the exhaust air parameter of the compressor is reduced, so that the change of the exhaust air parameter of the compressor can reflect the change influence of the performance parameter of the air conditioner compressor caused by the execution of the bypass defrosting mode to a certain extent at .
Here, the discharge parameter of the compressor includes a discharge temperature of the compressor, and/or a discharge pressure.
In alternative embodiments of the present disclosure, a temperature sensor is disposed at the discharge end of the compressor, and the temperature sensor can be used to detect the real-time temperature of the refrigerant flowing through the discharge end of the compressor, so that the real-time temperature of the refrigerant detected by the temperature sensor is used as the discharge temperature of the compressor in the embodiments of the present disclosure.
Similarly, the discharge end of the compressor is provided with an pressure sensor, and the pressure sensor can be used for detecting the real-time pressure of the refrigerant flowing through the discharge end of the compressor, so that the real-time pressure of the refrigerant detected by the pressure sensor is used as the discharge pressure of the compressor in the embodiment of the disclosure.
It should be understood that the defrost decay parameters of the present application include, but are not limited to, the return and discharge parameters of the compressor shown in the above embodiments; other air conditioner parameters with attenuation change under the influence of the bypass defrosting mode in the process of operating the air conditioner in the defrosting bypass mode also should be covered in the protection scope of the technical scheme of the application.
And S102, if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
Optionally, when the defrosting attenuation parameter obtained in step S101 is the return air parameter of the compressor, the heating start condition may be set to any conditions (1) TReturn air＜TThreshold value of return air；(2)PReturn air＜PThreshold value of return air；(3)TReturn air＜TThreshold value of return airAnd, PReturn air＜PThreshold value of return air(ii) a Wherein, TReturn airFor return air temperature, TThreshold value of return airIs the return air temperature threshold, PReturn airFor return air pressure, PThreshold value of return airIs the return air pressure threshold.
In the above optional embodiment, the value comparison between the return air parameter (return air temperature, return air pressure) and the corresponding return air threshold is mainly used as the heating start condition, where the return air threshold is generally used as a threshold for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, when the return air parameter is higher than the return air threshold, the influence of the bypass defrosting mode on the performance of the compressor is small, which reflects that the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state, and when the return air parameter is lower than the return air threshold, the influence of the bypass defrosting mode on the performance of the compressor is large, which reflects that the current and subsequent defrosting capabilities of the air conditioner are greatly weakened.
alternatively, when the defrost decay parameter obtained in step S101 is the discharge parameter of the compressor, the heating start condition can be set to any of conditions (1) TExhaust of gases＜TExhaust threshold；(2)PExhaust of gases＜PExhaust threshold；(3)TExhaust of gases＜TExhaust thresholdAnd, PExhaust of gases＜PExhaust threshold(ii) a Wherein, TExhaust of gasesTo exhaust temperature, TExhaust thresholdIs an exhaust gas temperature threshold, PExhaust of gasesIs the exhaust pressure, PExhaust thresholdIs an exhaust pressure threshold.
In the above alternative embodiment, the numerical comparison between the exhaust parameters (exhaust temperature, exhaust pressure) and their corresponding exhaust thresholds is mainly used as the heating start condition; here, the air discharge threshold value may also be a threshold value for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, and when the air discharge parameter is higher than the air discharge threshold value, the influence of the bypass defrosting mode on the performance of the compressor is small, so as to reflect that the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state; and when the exhaust parameter is lower than the exhaust threshold, the bypass defrosting mode has a large influence on the performance of the compressor, so that the current and subsequent defrosting capabilities of the air conditioner are greatly weakened. In this way, by comparing the value of the exhaust parameter with the exhaust threshold value, the function of judging whether to execute the subsequent steps to improve the defrosting capability of the air conditioner can be achieved.
alternatively, when the defrost decay parameters obtained in step S101 include the discharge and return parameters of the compressor, the heating on condition may be set to any of conditions (1) TExhaust of gases＜TExhaust thresholdAnd, TReturn air＜TThreshold value of return air；(2)PExhaust of gases＜PExhaust thresholdAnd, PReturn air＜PThreshold value of return air；(3)TExhaust of gases-TReturn air＜△TThreshold valueAnd/or, PExhaust of gases-PReturn air＜△PThreshold valueWherein, △ TThreshold valueAs a threshold value of temperature difference, △ PThreshold valueIs the differential pressure threshold.
In the above alternative embodiment, the common influence of the bypass defrosting mode on the return and exhaust parameters of the compressor is comprehensively considered; compared with the two embodiments which only use the return air parameter or the exhaust parameter as the heating starting condition, the embodiment of the disclosure can judge whether the defrosting capacity of the air conditioner is reduced more accurately, and is beneficial to improving the control precision of the control flow of the application.
Here, when the defrost decay parameter acquired in step S101 is another air conditioning parameter, the heating on condition may also be set with reference to the above embodiment, and the present invention is not limited thereto.
In the embodiment of the present disclosure, when the defrosting decay parameter in step S102 satisfies the heating start condition, the liquid outlet refrigerant of the outdoor heat exchanger is controlled to be heated. Here, the liquid refrigerant that is heat-released and liquefied in the outdoor heat exchanger in the bypass defrosting mode can absorb heat and vaporize again by heating the liquid refrigerant of the outdoor heat exchanger, so that the temperature and the flow rate of the gaseous refrigerant in the refrigerant that flows back to the compressor can be effectively increased, and further the temperature and the flow rate of the gaseous refrigerant of the refrigerant discharged by the compressor can be increased.
Optionally, an heating device is disposed in the refrigerant outlet line of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet line, so that in step S102, if the defrost decay parameter satisfies the heating on condition, the heating device may be controlled to be turned on, and if the defrost decay parameter does not satisfy the heating on condition, the heating device may be kept in the off state.
In the embodiment, the heating device is an electromagnetic heating device that heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat the refrigerant.
The electromagnetic heating device mainly comprises an induction coil and a power supply module, wherein the induction coil is wound on the refrigerant pipeline section, and the power supply module can provide alternating current for the induction coil; when the induction coil is electrified, alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, and the alternating magnetic field can generate eddy currents in the refrigerant pipe section, so that the heating and warming effects can be realized by means of the energy of the eddy currents.
It should be understood that the type of the heating device for heating the refrigerant is not limited to the above electromagnetic heating device, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution of the present application and are covered by the protection scope of the present application.
According to the control method for defrosting of the air conditioner, the liquid refrigerant of the outdoor heat exchanger can be heated according to the defrosting attenuation parameter and the heating starting condition under the condition that the air conditioner enters the bypass defrosting mode, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.
In , in some alternative embodiments, the control of the step S102 for heating the outlet refrigerant of the outdoor heat exchanger may be to heat the outlet refrigerant of the outdoor heat exchanger in a preset heating mode, where the preset heating mode includes a preset fixed heating rate (e.g. set as a heating temperature rise rate of 2 ℃/min) or a preset fixed heating time period (e.g. 5 minutes, 10 minutes).
The mode of starting heating in the preset heating mode is simple to operate and convenient to use; however, it still has the disadvantage that the control method is too rough.
In still alternative embodiments, the present application provides more precise control schemes, in the embodiments, the step S102 of controlling to heat the liquid refrigerant of the outdoor heat exchanger includes determining heating parameters, and controlling to heat the liquid refrigerant of the outdoor heat exchanger according to the heating parameters.
The embodiment of the disclosure heats the liquid refrigerant of the outdoor heat exchanger according to the determined heating parameter control, the heating parameter setting of the heating mode is more flexible, and the current defrosting working condition can be adapted, so that the accurate control of the liquid refrigerant heating can be realized, and meanwhile, the advantages of energy saving and consumption reduction are also achieved.
Optionally, the heating parameter comprises a heating rate or a heating time period.
In , the step of determining the heating parameter includes obtaining a corresponding heating parameter from the defrost decay correlation based on the defrost decay parameter.
Therefore, the step of determining the heating parameter in the embodiment of the disclosure is a closed-loop feedback control manner, so that the control accuracy is high, and the response speed is high.
Optionally, when the defrosting attenuation parameter is an air return temperature or an air discharge temperature, the corresponding heating parameter may be obtained from the defrosting attenuation correlation relationship according to △ T1, △ T2 or △ T3, where △ T1 is an temperature difference value between the air discharge temperature and an air discharge temperature threshold, △ T2 is a second temperature difference value between the air return temperature and an air return temperature threshold, and △ T2 is a temperature difference value between the air discharge temperature and the air return temperature.
Here, the defrost decay correlations include or more of △ T1 versus heating parameters, or or more of or more of △ T2 versus heating parameters, or or more of △ T3 versus heating parameters, exemplary alternative △ T1 versus heating parameters are shown in table 1, as shown in the following table,
TABLE 1
In the corresponding relation, the heating rate is positively correlated with △ T1, and the heating time period is positively correlated with △ T1, namely, the larger the value of △ T1, the lower the exhaust temperature of the compressor is, the greater the influence of the bypass defrosting mode on the performance of the compressor is, therefore, the higher the values are set for the heating rate and the heating time period, so as to increase the temperature and the flow rate of the refrigerant which flows back to the compressor as soon as possible in a heating manner, and improve the current performance of the compressor.
Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the -th defrost decay correlation, and then the heating may be performed according to the heating parameter.
Optionally , when the defrost decay parameter is return air pressure or exhaust air pressure, the corresponding heating parameter may be obtained from the second defrost decay association relationship according to △ P1, △ P2 or △ P3, where △ P1 is an pressure difference between the exhaust air pressure and an exhaust air pressure threshold, △ P2 is a second pressure difference between the return air pressure and a return air pressure threshold, and △ P3 is a pressure difference between the exhaust air pressure and the return air pressure.
Here, the second defrost decay correlations include or more △ P1 versus heating parameters, or or more or more △ P2 versus heating parameters, or or more △ P3 versus heating parameters, exemplary optional △ P2 versus heating parameters are shown in table 2, as shown in the following table,
TABLE 2
| △ P1 (Unit: MPa) | Heating Rate (Unit:. degree. C/min) | Heating time (unit: min) |
| b1＜△P1≤b2 | v21 | t21 |
| b2＜△P1≤b3 | v22 | t22 |
| b3＜△P1 | v23 | t23 |
In the corresponding relation, the heating rate is positively correlated with △ P1, and the heating time period is positively correlated with △ P1, namely, the larger the value of △ P1, the lower the exhaust pressure of the compressor is, the greater the influence of the bypass defrosting mode on the performance of the compressor is, therefore, the higher the values are set for the heating rate and the heating time period, so as to increase the temperature and the flow rate of the refrigerant which flows back to the compressor as soon as possible in a heating manner, and improve the current performance of the compressor.
Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the second defrost decay correlation, and then the heating may be performed according to the heating parameter.
In the above embodiments, the present application is provided with individual correlations, and the air conditioner may select kinds of defrost attenuation correlations to determine corresponding heating parameters according to actual needs.
Optionally, the specifically selected rate association relationship may be determined according to a current cold and heat load of the air conditioner, for example, when the current cold and heat load of the air conditioner is low, the th defrost attenuation association relationship is selected, and the temperature of the refrigerant of the back exhaust of the compressor is mainly used as a reference factor, and when the current cold and heat load of the air conditioner is high, the second defrost attenuation association relationship is selected, and at this time, it is mainly considered that the high cold and heat load also has a large influence on the system pressure of the air conditioner, and therefore, in order to ensure the temperature operation of the air conditioner, the pressure of the refrigerant of the back exhaust of the compressor is used as a reference factor.
Here, the level of the cooling and heating load of the current air conditioner can be determined by parameters such as the indoor ambient temperature and the outdoor ambient temperature, for example, the air conditioner is preset with indoor temperature threshold values, when the indoor ambient temperature is less than the indoor temperature threshold value, the cooling and heating load of the air conditioner is higher, and when the indoor ambient temperature is greater than or equal to the indoor temperature threshold value, the cooling and heating load of the air conditioner is lower.
Of course, the air conditioning cooling and heating load may be determined by calculation of the cooling and heating load as in the related art, and further, which of the above-described defrosting attenuation correlations is used may be determined according to the specifically obtained cooling and heating load.
Therefore, in the embodiment of the disclosure, the heating operation of the air conditioner for the liquid outlet refrigerant of the outdoor heat exchanger can be triggered according to the performance change of the air conditioner compressor in the bypass defrosting process, and meanwhile, the influence of cold and hot loads on the air conditioning system can be considered, so that the accuracy of air conditioner control is improved, and the operation stability of the air conditioner is guaranteed.
In still other embodiments, the step of determining the heating parameter includes obtaining a corresponding heating parameter from the defrost operation correlation based on the defrost operation parameter.
Optionally, the defrosting operation parameter is a parameter when the air conditioner executes the bypass defrosting mode, and the defrosting operation parameter can reflect the defrosting capacity of the bypass defrosting mode, so that the corresponding heating parameter is determined by using the parameter capable of showing the defrosting capacity of the bypass defrosting mode in the embodiment of the disclosure. For example, the defrost operating parameter includes a bypass refrigerant parameter of the refrigerant flowing through the defrost bypass.
In the embodiment of the present disclosure, the branch refrigerant parameter includes a branch refrigerant temperature, a branch refrigerant pressure, and/or a branch refrigerant flow rate.
Optionally, the air conditioner is provided with a temperature sensor for detecting the temperature of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the temperature of the refrigerant detected by the temperature sensor is used as the branch refrigerant temperature, and is also optionally provided with a pressure sensor for detecting the pressure of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the pressure of the refrigerant detected by the pressure sensor is used as the branch refrigerant pressure, and is also optionally provided with a flow meter for detecting the flow rate of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the flow rate of the refrigerant detected by the flow meter is used as the branch refrigerant flow rate.
In optional embodiments, the step of obtaining the corresponding heating parameter from the correlation relationship of the defrosting operation according to the defrosting operation parameter includes obtaining the corresponding heating parameter from the correlation relationship of the defrosting operation according to the branch refrigerant parameter of the refrigerant flowing through the defrosting bypass branch.
Illustratively, alternative branch refrigerant temperatures T are shown in Table 3Branch circuitThe correspondence with the heating parameters, as shown in the following table,
TABLE 3
| TBranch circuit(unit:. degree.C.) | Heating Rate (Unit:. degree. C/min) | Heating time (unit: min) |
| c1＜TBranch circuit≤c2 | v31 | t31 |
| c2＜TBranch circuit≤c3 | v32 | t32 |
| c3＜TBranch circuit | v33 | t33 |
In the corresponding relation, the heating rate and the branch refrigerant temperature are in negative correlation, and the heating duration and the branch refrigerant temperature are in negative correlation.
Therefore, when the operation of heating the liquid refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the th defrost associated relationship, and then the heating may be performed according to the heating parameter.
In an alternative embodiment of , the method further includes obtaining a corresponding heating parameter from the associated relationship according to the defrosting operation parameter, and obtaining a corresponding heating parameter from the associated relationship according to the branch refrigerant parameter and the main refrigerant parameter.
The main path refrigerant parameter is the parameter of the refrigerant entering the outdoor heat exchanger through the refrigerant circulation loop. For example, the main refrigerant parameter includes a main refrigerant temperature, a main refrigerant pressure, and/or a main refrigerant flow rate. The main path refrigerant parameter can not only indirectly reflect the performance change of the compressor influenced by the defrosting process, but also can affect the actual defrosting effect of the air conditioner due to the fact that the main path refrigerant is mixed with the branch path refrigerant and then enters the outdoor heat exchanger for defrosting.
Optionally, the air conditioner is provided with a temperature sensor for detecting the temperature of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the temperature of the refrigerant detected by the temperature sensor is used as the temperature of the refrigerant in the main path, and is optional, the air conditioner is provided with a pressure sensor for detecting the pressure of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the pressure of the refrigerant detected by the pressure sensor is used as the pressure of the refrigerant in the main path, and is optional, the air conditioner is provided with a flow meter for detecting the flow rate of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the flow rate of the refrigerant detected by the flow meter is used as the flow rate of.
Exemplarily, table 4 shows optional main refrigerant parameters TMain roadBranch refrigerant temperature TBranch circuitThe correspondence with the heating parameters, as shown in the following table,
TABLE 4
Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the second defrosting operation association relationship, and then the heating may be performed according to the heating parameter.
In alternative embodiments, the control method for defrosting an air conditioner further includes controlling to stop heating the liquid refrigerant of the outdoor heat exchanger if the defrost attenuation parameter does not satisfy the heating start condition.
Here, when the defrosting decay parameter does not satisfy the heating start condition, it is described that the bypass defrosting mode of the current operation of the air conditioner is restored to the defrosting capacity capable of satisfying the current defrosting requirement for the outdoor heat exchanger, and therefore, the heating of the outlet refrigerant of the outdoor heat exchanger is controlled to be stopped, so as to reduce the power resources consumed by maintaining the continuous operation of the heating device.
Fig. 2 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides control devices for defrosting of an air conditioner, the structure of which is shown in fig. 2, including:
a processor (processor)200 and a memory (memory)201, and may further include a communication interface (communication I interface) 202 and a bus 203. The processor 200, the communication interface 202 and the memory 201 can communicate with each other through the bus 203. The communication interface 202 may be used for information transfer. The processor 200 may call logic instructions in the memory 201 to perform the control method for defrosting the air conditioner of the above embodiment.
Furthermore, the logic instructions in the memory 201 may be stored in computer readable storage media when implemented in software functional units and sold or used as independent products.
The processor 200 executes functional applications and data processing by executing the program instructions/modules stored in the memory 201, namely, implements the control method for defrosting the air conditioner in the above method embodiment.
The memory 201 may include a program storage area that may store an operating system, application programs necessary for at least functions, and a data storage area that may store data created according to the use of the terminal device, etc.
Fig. 3 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
As shown in fig. 3, the disclosed embodiments further provide air conditioners, including:
the refrigerant circulation loop is formed by connecting an outdoor heat exchanger 11, an indoor heat exchanger 12, a throttling device 13 and a compressor 14 through refrigerant pipelines;
the defrosting bypass branch 21, end is connected with the exhaust port of the compressor 14, another end is connected with the refrigerant outlet pipe of the outdoor heat exchanger 11 under the heating mode, the defrosting bypass branch 21 is provided with a control valve 22;
the heating device 3 is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 11 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
and a control device (not shown in the figure) for defrosting the air conditioner, which is electrically connected with the control valve 22 and the heating device 3. Here, the control device for air conditioner defrosting is the control device shown in the foregoing embodiment.
The air conditioner adopting the structural design can heat the liquid refrigerant of the outdoor heat exchanger according to the defrosting attenuation parameter and the heating starting condition, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.
The disclosed embodiments also provide computer-readable storage media storing computer-executable instructions configured to perform the above-described method for air conditioner defrosting.
The disclosed embodiments also provide computer program products 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 air conditioner defrosting.
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 embodiment of the present disclosure can be embodied in the form of a software product, where the computer software product is stored in storage media, and includes or more instructions to enable computer devices (which may be personal computers, servers, or network devices) to execute all or part of the steps of the method described in the embodiment of the present disclosure.
The above description and drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them, other embodiments may include structural, logical, electrical, procedural and other changes, the embodiments merely represent possible changes unless explicitly claimed, individual components and features are optional and the order of operation may vary, the scope of the embodiments of the disclosure includes the full scope of the claims and all available equivalents of the claims, when used in this application, although the terms "", "second" and the like may be used in this application to describe elements without limitation to these terms, these terms are used only to distinguish elements from elements, for example, the 2 element may be called the second element and, as such, the first, second, element element may be called the fifth element 84 element as if used in conjunction with the description of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, ninth, tenth, twelfth, eleventh, thirteenth, tenth, thirteenth, tenth, twelfth, thirteenth, and thirteenth, tenth, and the following description of the following claims, or any of which may be construed according to include the same or any element, including or similar element, as if a component, including or a "no element, a" 2 "a" no element, a "may be included in this specification," a "or" a "when used in this specification," a "or" a "when used in this specification, or" includes or "a" or "includes or" when used in this application, or "a" includes or "a" or "a" element, including or "element, including or" element, a "element, including or" element, including or "element, including or" a "element, including or" element, including or "element, may be used in describing a" or "element, including or" element, including or "element, including or" element, including.
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.
For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be only logical functional divisions, and in actual implementation, there may be other divisions, for example, multiple units or components may be combined or may be integrated into another systems, or features may be omitted or not executed.
The flowcharts and block diagrams in the figures may represent blocks, program segments, or portions of code which contain or more executable instructions for implementing specified logical functions, in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures.
Claims (10)
1, A control method for defrosting of air conditioner, which is characterized by comprising:
acquiring a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode; the bypass defrosting mode comprises the step of guiding a refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;
and if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
2. The control method as claimed in claim 1, wherein the controlling of heating the liquid refrigerant of the outdoor heat exchanger includes:
determining the heating parameter; wherein the heating parameter comprises a heating rate or a heating time period;
and controlling the liquid outlet refrigerant of the outdoor heat exchanger to be heated according to the heating parameters.
3. The control method of claim 2, wherein the determining a heating parameter comprises:
and acquiring corresponding heating parameters from the correlation of defrosting attenuation according to the defrosting attenuation parameters.
4. The control method of claim 2, wherein the determining a heating parameter comprises:
acquiring corresponding heating parameters from the associated relation of defrosting operation according to the defrosting operation parameters;
the defrosting operating parameters comprise branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch.
5. The control method according to claim 4, wherein the obtaining the corresponding heating parameter from the correlation relationship of the defrosting operation according to the defrosting operation parameter comprises:
according to the branch refrigerant parameter of the refrigerant flowing through the defrosting bypass branch, the corresponding heating parameter is obtained from the th defrosting operation incidence relation, or,
acquiring corresponding heating parameters from a second defrosting operation association relation according to the branch refrigerant parameters and the main refrigerant parameters; the main path refrigerant parameter is a parameter of a refrigerant entering the outdoor heat exchanger through a refrigerant circulation loop.
6. The control method of claim 5, wherein the branch refrigerant parameter comprises a branch refrigerant temperature, a branch refrigerant pressure, and/or a branch refrigerant flow rate;
the main path refrigerant parameters include a main path refrigerant temperature, a main path refrigerant pressure, and/or a main path refrigerant flow rate.
7. The control method of wherein the defrost decay parameter comprises a discharge parameter of the compressor comprising a discharge pressure and/or a discharge temperature and/or a return parameter comprising a return pressure and/or a return temperature;
the heating on condition includes:
Texhaust of gases＜TExhaust thresholdAnd/or, TReturn air＜TThreshold value of return air(ii) a Wherein, TExhaust of gasesTo exhaust temperature, TExhaust thresholdIs an exhaust temperature threshold, TReturn airFor return air temperature, TThreshold value of return airIs the return air temperature threshold; orIn order to achieve the above-mentioned object,
Pexhaust of gases＜PExhaust thresholdAnd/or, PReturn air＜PThreshold value of return air(ii) a Wherein, PExhaust of gasesIs the exhaust pressure, PExhaust thresholdIs an exhaust pressure threshold, PReturn airFor return air pressure, PThreshold value of return airIs the return air pressure threshold; or,
Texhaust of gases-TReturn air＜△TThreshold valueAnd/or, PExhaust of gases-PReturn air＜△PThreshold valueWherein, △ TThreshold valueAs a threshold value of temperature difference, △ PThreshold valueIs the differential pressure threshold.
8. The control method according to claim 1, characterized by further comprising:
and if the defrosting attenuation parameter does not meet the heating starting condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.
A control device 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 as claimed in any of claims 1 to 8 and when executing the program instructions.
10, air conditioner, characterized by that, 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 defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode;
the heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
a control for defrosting an air conditioner as set forth in claim 9, electrically connected to said control valve and said heating means.
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