CN110736211A - 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 PDF

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Publication number
CN110736211A
CN110736211A CN201910918722.8A CN201910918722A CN110736211A CN 110736211 A CN110736211 A CN 110736211A CN 201910918722 A CN201910918722 A CN 201910918722A CN 110736211 A CN110736211 A CN 110736211A
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China
Prior art keywords
defrosting
heating
refrigerant
heat exchanger
attenuation
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CN201910918722.8A
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CN110736211B (en
Inventor
许文明
罗荣邦
王飞
于文文
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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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
    • 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
    • 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
    • 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
    • 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

Abstract

The control method can control the liquid refrigerant of the outdoor heat exchanger to be heated according to the defrosting attenuation parameter and the defrosting operating parameter so as to enable the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger to be heated into gaseous refrigerant, thereby effectively improving the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor, and further reducing 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.

Description

Control method and control device for defrosting of air conditioner and air conditioner
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:
after the air conditioner enters a bypass defrosting mode, acquiring defrosting working parameters and defrosting attenuation parameters; 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 when the defrosting working parameter and the defrosting attenuation parameter meet 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, after the air conditioner enters the bypass defrosting mode, the liquid refrigerant of the outdoor heat exchanger can be heated according to the defrosting attenuation parameter and the defrosting working parameter, 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 defrosting working parameters and defrosting attenuation parameters after 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 decay amount or decay rate of the indoor ambient temperature.
In the process of the bypass defrosting mode in the air conditioner operation step S101, since a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the amount of refrigerant flowing to the indoor heat exchanger through the refrigerant circulation circuit and releasing heat to the indoor environment decreases, and therefore, the execution of the bypass defrosting mode is often accompanied by a change in the indoor environment temperature.
In alternative embodiments of the present disclosure, the indoor unit of the air conditioner is provided with a temperature sensor, which can be used to detect the temperature of the indoor environment in which the indoor unit is located, therefore, in the embodiment of the present disclosure, the attenuation amount or attenuation rate of the indoor environment temperature is determined according to the temperature data detected by the temperature sensor.
In another embodiments, the defrost decay parameter obtained in step S101 is the decay amount or decay rate of the coil temperature of the indoor heat exchanger.
Here, the decrease in the temperature and the flow rate of the refrigerant caused by the bypass defrosting mode can directly affect the temperature change at the coil position of the indoor heat exchanger. Therefore, the attenuation amount or the attenuation rate of the coil temperature can also be selected as the reference parameter for controlling and adjusting in the subsequent steps.
In alternative embodiments of the present disclosure, the indoor heat exchanger is provided with temperature sensors at the coil positions, which can be used to detect the real-time temperature of the coil, therefore, the temperature data of the coil detected by the temperature sensors is used to determine the attenuation amount or attenuation rate of the coil temperature in the disclosed embodiment.
It should be understood that the defrost decay parameters of the present application include, but are not limited to, the indoor ambient temperature or the coil temperature of the indoor heat exchanger 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.
In , the defrosting operation parameter obtained in step S101 is the current defrosting time period of the bypass defrosting mode.
The air conditioner is provided with a timing module, and the timing module can be used for timing in the process of running the bypass defrosting mode of the air conditioner; therefore, the current defrosting time period obtained in step S101 is the time period data recorded by the timer module.
Here, when the air conditioner exits the bypass defrosting mode, the current timing length of the timing module is cleared to restart timing when the air conditioner enters the bypass defrosting mode times, thereby improving the accuracy of control.
And S102, when the defrosting working parameter and the defrosting attenuation parameter meet 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 attenuation amount or the attenuation rate of the indoor ambient temperature, the heating-on condition may be set to any conditions including (1) △ TIndoor useT1 of not less than △Defrosting≥tThreshold value；(2)VIndoor useNot less than V1, and tDefrosting≥tThreshold value；(3)△TIndoor use≥△T1，VIndoor useT is not less than V1Defrosting≥tThreshold valueWherein, △ TIndoor use th attenuation amount of indoor environment temperature, △ T1 is th temperature attenuation threshold value, VIndoor use th rate of decay for indoor ambient temperature, V1 th rate decay threshold, tDefrostingFor the current defrost duration of the bypass defrost mode, tThreshold valueIs a duration threshold.
In the above embodiment, the attenuation amount or attenuation rate of the indoor environment temperature is mainly adopted, compared with the data between the corresponding temperature thresholds, and combined with the numerical comparison between the current defrosting time and the time threshold thereof, the attenuation amount or attenuation rate is used as the heating starting condition, here, the temperature attenuation threshold and the rate attenuation threshold are used as the limit values for measuring the influence of the bypass defrosting mode of the air conditioner on the indoor environment temperature, when the attenuation amount of the indoor environment temperature is higher than the temperature attenuation threshold, or the attenuation rate of the indoor environment temperature is higher than the rate attenuation threshold, the influence of the bypass defrosting mode on the performance of the compressor is larger, and then the influence of the bypass defrosting mode on the temperature of the indoor environment is larger, the current and subsequent defrosting capabilities of the air conditioner are reduced greatly, otherwise, the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state, and the heating starting condition of the application also introduces the reference factor of defrosting time length, so as to reduce the influence of the error caused by the initial bypass branch.
Optionally, when the defrosting attenuation parameter obtained in step S101 is the attenuation amount or the attenuation rate of the indoor ambient temperature, the heating-on condition may be set to any conditions including (1) △ TCoil pipeT2 of not less than △Defrosting≥tThreshold value；(2)VCoil pipeNot less than V2, and tDefrosting≥tThreshold value；(3)△TCoil pipe≥△T2，VCoil pipeT is not less than V2Defrosting≥tThreshold valueWherein, △ TCoil pipeA second attenuation amount of the coil temperature of the indoor heat exchanger, △ T2 is a second temperature attenuation threshold value, VCoil pipeCoil pipe for indoor heat exchangerA second rate of decay of temperature, V2, is a second rate decay threshold.
In the above optional embodiment, the attenuation amount or attenuation rate of the coil temperature of the indoor heat exchanger is mainly used, and is compared with the data between the corresponding temperature thresholds, and the comparison of the current defrosting time length and the time length threshold is combined to be used as the heating starting condition.
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 operation parameter and the defrosting attenuation parameter in step S102 satisfy the heating start condition, the liquid outlet refrigerant of the outdoor heat exchanger is controlled to be heated. Here, the liquid refrigerant which 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 which flows back to the compressor can be effectively improved, and the temperature and the flow rate of the gaseous refrigerant of the refrigerant discharged by the compressor can be further improved, under the condition, the subsequent refrigerant used in the bypass defrosting mode can still keep higher temperature and flow rate, and the defrosting capacity of the bypass defrosting mode cannot be greatly attenuated along with the change of time; in addition, the temperature of the refrigerant flowing through the refrigerant circulation circuit to the indoor heat exchanger can be increased, and the amount of attenuation or the rate of attenuation of the indoor environment can be reduced.
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, after the air conditioner enters the bypass defrosting mode, the liquid refrigerant of the outdoor heat exchanger can be heated according to the defrosting attenuation parameter and the defrosting working parameter, 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 heating parameter for controlling the heating of the outlet refrigerant of the outdoor heat exchanger in step S102 is obtained according to the defrosting attenuation parameter or the defrosting operation parameter.
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.
In one embodiment, the defrost decay parameter comprises an th decay amount or th decay rate of the indoor ambient temperature, or a second decay amount or second decay rate of the coil temperature of the indoor heat exchanger.
Optionally, the defrosting operation parameter used for obtaining the heating parameter is the defrosting operation parameter shown in the foregoing embodiment, and in the embodiment, the defrosting operation parameter includes a current defrosting time period of the bypass defrosting mode.
Optionally, the heating parameter obtained according to the defrosting attenuation parameter or the defrosting operation parameter includes a heating rate or a heating duration.
In , the heating parameters are obtained according to the defrost attenuation parameters, including obtaining corresponding heating parameters from defrost attenuation association relation according to attenuation amount or attenuation rate of indoor environment temperature.
Here, the th defrost decay correlation includes or more of the correspondence between th decay amounts and heating parameters, or or more of the correspondence between th decay rates and heating parameters, exemplary alternative th decay rate and heating parameter correspondences are shown in Table 1, as shown in the following table,
TABLE 1
VIndoor use(unit:. degree. C/min) Heating Rate (Unit:. degree. C/min) Heating time (unit: min)
v1＜VIndoor use≤v2 v11 t11
v2＜VIndoor use≤v3 v12 t12
v3＜VIndoor use v13 t13
In the corresponding relation, the heating rate and VIndoor useIs positively correlated with the heating duration VIndoor useIs positively correlated. I.e. VIndoor useThe larger the value of (b) is, the faster the temperature change of the indoor environment is, the larger the adverse effect of the bypass defrosting mode on the indoor environment is, and the larger the attenuation of the defrosting capacity of the bypass defrosting mode is, so that the heating rate and the heating duration are set to be higher values, and the temperature and the flow rate of the refrigerant returning to the compressor are increased as soon as possible by heating, so as to improve the temperature condition of the indoor environment and the defrosting capacity of the air conditioner.
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.
In still other embodiments, obtaining the heating parameter based on the defrost decay parameter includes obtaining the corresponding heating parameter from a second defrost decay correlation based on a second decay amount or a second decay rate of the coil temperature of the indoor heat exchanger.
Where the second defrost decay correlation includes or more second decay rates corresponding to heating parameters, or or more second decay rates corresponding to heating parameters exemplary alternative second decay rate corresponding to heating parameters are shown in table 2, as shown in the following table,
TABLE 2
VCoil pipe(unit:. degree. C/min) Heating Rate (Unit:. degree. C/min) Heating time (unit: min)
v1＜VCoil pipe≤v2 v21 t21
v2＜VCoil pipe≤v3 v22 t22
v3＜VCoil pipe v23 t23
In the corresponding relation, the heating rate and VCoil pipeIs positively correlated with the heating duration VCoil pipeIs positively correlated. I.e. VCoil pipeThe larger the value of the value is, the faster the temperature change of the coil of the indoor heat exchanger is, the larger the adverse effect of the bypass defrosting mode on the indoor heat exchanger is, and the larger the attenuation of the defrosting capacity of the bypass defrosting mode is, so that the heating rate and the heating duration are set to be higher values, the temperature and the flow rate of the refrigerant flowing back to the compressor are increased as soon as possible in a heating mode, and the temperature condition of the coil of the indoor heat exchanger and the defrosting capacity of the air conditioner are improved.
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 the 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 indoor environment temperature 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 higher cold and heat load also has a greater influence on the system pressure of the air conditioner, so that in order to ensure the temperature operation of the air conditioner, the coil temperature of the indoor heat exchanger 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 alternative embodiments, the obtaining the heating parameter according to the defrosting operation parameter includes obtaining a corresponding heating parameter from the correlation of the defrosting operation according to the current defrosting duration of the bypass defrosting mode.
Here, as the current defrosting duration is extended, the defrosting capacity of the bypass defrosting mode is reduced accordingly, so that the heating parameter set to be higher can be controlled to recover the reduced defrosting capacity as soon as possible under the condition that the current defrosting duration is longer; and when the current defrosting time is shorter, the heating parameter is controlled to be set to be lower so as to reduce the power consumption of the heating operation on the premise of not influencing the recovery of the defrosting capacity.
Illustratively, the correspondence of alternative current defrost durations to heating parameters is shown in table 3, which, as shown below,
TABLE 3
tDefrosting(unit: min) Heating Rate (Unit:. degree. C/min) Heating time (unit: min)
t1＜tDefrosting≤t2 v31 t31
t2＜tDefrosting≤t3 v32 t32
t3＜tDefrosting v33 t33
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 correlation of the defrosting operation, and then the heating may be performed according to the heating parameter.
In optional embodiments, the control method for air conditioner defrosting further includes obtaining a heating start condition corresponding to the next times of entering the bypass defrosting mode from the condition set when the defrosting operation parameter and the defrosting attenuation parameter satisfy the heating start condition, wherein a threshold value of the heating start condition corresponding to the next times of entering the bypass defrosting mode is smaller than a corresponding threshold value of the current heating start condition.
Here, the air conditioning control system of the present application stores therein a condition set including a plurality of heating on-conditions that adopt different combinations of threshold settings, for example, wherein heating on-conditions a are △ TIndoor useT11 of not less than △Defrosting≥t1Threshold valueWherein another heating start conditions B are △ TIndoor useT12 of not less than △Defrosting≥t2Threshold valueOf the above set of conditions, △ T11 is less than △ T12, T1Threshold valueLess than t2Threshold valueTherefore, for example, in the current control flow, whether to heat the liquid outlet refrigerant of the outdoor heat exchanger is controlled by using the heating start condition a, and when the defrosting operation parameter and the defrosting attenuation parameter satisfy the heating start condition, optionally, the heating start condition corresponding to the next times of entering the bypass defrosting mode is selected as the heating start condition B.
In the embodiment of the disclosure, the threshold value in the heating start condition corresponding to the next times of entering the bypass defrosting mode is smaller than the threshold value corresponding to the current heating start condition, so that the heating operation on the liquid outlet refrigerant of the outdoor heat exchanger can be triggered more easily when the bypass defrosting mode is entered times, the disturbance influence on the indoor environment temperature under the condition that the bypass defrosting mode is continuously and repeatedly triggered is reduced, the defrosting capability of the air conditioner in the process of repeatedly running the bypass defrosting mode can be improved more timely and rapidly, and the defrosting effect is ensured.
In optional embodiments, the control method for defrosting of an air conditioner further includes controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger when the defrosting operation parameter and the defrosting attenuation parameter do not meet 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 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 defrosting working parameter after 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 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 represent only 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 term 2 may be called a second element and, as such, the term " may be used only to distinguish between" elements "and" elements "if used without change in the meaning of the description," the term "is used in conjunction with" 4642 "or" may be used in "a" or "a" element "may be used in conjunction with" a "or" where "a" element is included in a "or included in the singular form of the embodiment" (or included in addition to the element, or included in a "component equivalent," and/or "may be included in a" disclosed "a" and/or "element).
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:
after the air conditioner enters a bypass defrosting mode, acquiring defrosting working parameters and defrosting attenuation parameters; 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 when the defrosting working parameter and the defrosting attenuation parameter meet the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
2. The control method according to claim 1, wherein the heating parameter for controlling heating of the outlet refrigerant of the outdoor heat exchanger is obtained according to the defrost attenuation parameter or the defrost working parameter;
wherein the defrost decay parameter comprises an th decay amount or th decay rate of the indoor ambient temperature, or a second decay amount or second decay rate of the coil temperature of the indoor heat exchanger;
the defrost operating parameter includes a current defrost duration for the bypass defrost mode.
3. The control method of claim 2, wherein said deriving a heating parameter from a defrost decay parameter comprises:
obtaining corresponding heating parameters from the defrosting attenuation correlation according to the th attenuation amount or the th attenuation rate of the indoor environment temperature, or,
and acquiring corresponding heating parameters from a second defrosting attenuation incidence relation according to a second attenuation quantity or a second attenuation rate of the temperature of the coil pipe of the indoor heat exchanger.
4. The control method of claim 2, wherein obtaining the heating parameter based on the defrost operating parameter comprises:
and acquiring corresponding heating parameters from the correlation relation of defrosting operation according to the current defrosting time of the bypass defrosting mode.
5. Control method according to claim 2, characterized in that the heating parameters comprise a heating time period and/or a heating rate.
6. The control method of any of claims 2-5, wherein the heating on condition comprises:
△Tindoor use≥△T1，VIndoor use≥V1，△TCoil pipeNot less than △ T2, or VCoil pipe≥V2；
And t isDefrosting≥tThreshold value；
Wherein, △ TIndoor useThe th attenuation amount of the indoor environment temperature is △ T1 is the th temperature attenuation threshold value VIndoor use th decay rate of the indoor ambient temperature, V1 is th rate decay threshold, △ TCoil pipeA second attenuation amount of the coil temperature of the indoor heat exchanger, △ T2 is a second temperature attenuation threshold value, VCoil pipeA second decay rate for the coil temperature of the indoor heat exchanger, V2 being a second rate decay threshold; t is tDefrostingIs the current defrost duration, t, of the bypass defrost modeThreshold valueIs a duration threshold.
7. The control method according to claim 6, characterized by further comprising:
when the defrosting working parameter and the defrosting attenuation parameter meet the heating starting condition, acquiring the heating starting condition corresponding to the bypass defrosting mode entering for times from the condition set;
wherein the threshold value of the heating starting condition corresponding to the lower times of entering the bypass defrosting mode is smaller than the corresponding threshold value of the current heating starting condition.
8. The control method according to claim 1, characterized by further comprising:
and when the defrosting working parameter and the defrosting attenuation parameter do 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.
CN201910918722.8A 2019-09-26 2019-09-26 Control method and control device for defrosting of air conditioner and air conditioner Active CN110736211B (en)

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