CN110470024B - Control method and device for defrosting of air conditioner and air conditioner - Google Patents
Control method and device for defrosting of air conditioner and air conditioner Download PDFInfo
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- CN110470024B CN110470024B CN201910714523.5A CN201910714523A CN110470024B CN 110470024 B CN110470024 B CN 110470024B CN 201910714523 A CN201910714523 A CN 201910714523A CN 110470024 B CN110470024 B CN 110470024B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- General Engineering & Computer Science (AREA)
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- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: under the condition that the air conditioner needs defrosting, controlling to heat the refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner and controlling to perform frequency reduction operation on a compressor of the air conditioner; obtaining the temperature, the heating times and the heating duration of an outdoor coil of an outdoor heat exchanger; and under the condition that the temperature, the heating times and the defrosting time of the outdoor coil meet first preset conditions, controlling the air conditioner to enter a reverse circulation defrosting mode. The time when the air conditioner enters the reverse circulation defrosting mode is comprehensively judged by utilizing the temperature, the heating times and the heating duration of an outdoor coil of the outdoor heat exchanger, so that the control precision of controlling the air conditioner to enter the reverse circulation defrosting mode is improved; and the frosting condition of the outdoor heat exchanger is improved by heating the refrigerant flowing through the refrigerant liquid outlet pipeline and reducing the frequency of the compressor. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.
Description
Technical Field
The application relates to the technical field of air conditioner defrosting, for example, to a control method and device for air conditioner defrosting and an air conditioner.
Background
At present, most of main flow machine types of air conditioners have a heat exchange function of a refrigerating and heating double mode, and users generally adjust the air conditioners to a heating mode to utilize the air conditioners to increase the temperature of indoor environment in low-temperature areas or under the weather conditions with large wind and snow; in the operation and heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit plays a role of an evaporator absorbing heat from the outdoor environment, and is affected by the temperature and the humidity of the outdoor environment, more frost is easily condensed on the outdoor heat exchanger, and the heating capacity of the air conditioner is lower and lower when the frost is condensed to a certain thickness, so that the outdoor heat exchanger needs to be defrosted in order to ensure the heating effect and avoid excessive frost condensation.
Here, the defrosting of the outdoor heat exchanger is mainly performed in the following ways: firstly, reverse cycle defrosting is carried out, when the air conditioner carries out reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; secondly, an electric heating device is added on a refrigerant pipeline of the air conditioner, the electric heating device is used for heating the refrigerant flowing into the outdoor heat exchanger, and then the heat of the refrigerant is used for melting the frost condensed on the outdoor heat exchanger; and thirdly, adjusting the operation parameters of the air-conditioning components such as the compressor, the electronic expansion valve and the like to change the temperature and the pressure state of the refrigerant in the refrigerant pipeline, so that the refrigerant pipeline can also have the function of defrosting the outdoor heat exchanger.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
among the above-mentioned several ways of defrosting the outdoor heat exchanger, the defrosting is more thorough by using the reverse cycle defrosting, but the reverse cycle defrosting changes the flow path of the refrigerant, so that the high-temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger to melt the frost by using the heat of the refrigerant, the original heating mode of the air conditioner can be broken, and the normal heating performance of the air conditioner is greatly influenced. Therefore, in the related art, when the outdoor heat exchanger needs defrosting, that is, the air conditioner operates in the reverse cycle defrosting mode, the normal heating performance of the air conditioner is greatly affected.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for defrosting of an air conditioner and the air conditioner, and aims to solve the technical problem that in the related art, when an outdoor heat exchanger needs defrosting, an air conditioner runs a reverse cycle defrosting mode, and the normal heating performance of the air conditioner is greatly influenced.
In some embodiments, the control method for defrosting an air conditioner includes:
under the condition that the air conditioner needs defrosting, controlling to heat the refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner and controlling to perform frequency reduction operation on a compressor of the air conditioner;
obtaining the temperature, the heating times and the heating duration of an outdoor coil of an outdoor heat exchanger;
and under the condition that the temperature, the heating times and the defrosting time of the outdoor coil meet first preset conditions, controlling the air conditioner to enter a reverse circulation defrosting mode.
In some embodiments, the control device for air conditioner defrosting includes a processor and a memory storing program instructions, and the processor is configured to execute the control method for air conditioner defrosting when executing the program instructions.
In some embodiments, the air conditioner includes:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device for defrosting of the air conditioner is electrically connected with the compressor 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:
in the defrosting operation process of the air conditioner, the time when the air conditioner enters the reverse circulation defrosting mode is comprehensively judged by using the parameters of the temperature of an outdoor coil of an outdoor heat exchanger, the heating times of a heating device and the heating duration, so that the control precision for controlling the air conditioner to enter the reverse circulation defrosting mode is improved, and the great influence on the normal heating performance of the air conditioner caused by the fact that the air conditioner operates the reverse circulation defrosting mode when the outdoor heat exchanger needs defrosting is avoided; the temperature of the refrigerant flowing back to the compressor is increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the heating efficiency is improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is reduced; meanwhile, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and the adverse effects of temperature factors such as too low temperature on the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are further reduced, so that the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart diagram of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
Fig. 1 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 1, including the following steps:
s101: and under the condition that the air conditioner needs defrosting, controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner and controlling the frequency reduction operation of the compressor of the air conditioner.
In an embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a severe working condition with a low temperature and a high humidity, and at this time, a user generally sets the air conditioner to operate in a heating mode so as to heat and raise the temperature of the indoor environment by using the air conditioner. Therefore, the control method for defrosting the air conditioner provided by the embodiment of the disclosure is a control flow which is started when the air conditioner operates in a heating mode.
Optionally, whether the air conditioner needs defrosting is judged by comparing the outdoor environment temperature with the frost point temperature. When the outdoor environment temperature is lower than the frost point temperature, the air conditioner is considered to need defrosting; when the outdoor ambient temperature is higher than the frost point temperature, the air conditioner is considered to be not required to defrost.
The defrosting operation of the air conditioner comprises the steps of controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner and performing the frequency reduction operation on the compressor of the air conditioner. The temperature of the refrigerant flowing into the indoor heat exchanger can be further improved by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the actual defrosting effect can be enhanced; the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and then the adverse effects of temperature factors such as too low temperature on the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are reduced, so that the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
Optionally, a heating device is disposed at a refrigerant outlet pipe of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet pipe. Under the condition that the air conditioner needs defrosting, the heating device can be controlled to be started; and under the condition that the air conditioner does not need heating, the off state of the heating device is kept.
In one embodiment, the heating device is an electromagnetic heating device, which heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat the refrigerant.
The electromagnetic heating device mainly comprises an induction coil and a power supply module, wherein the induction coil is wound on the refrigerant pipeline section, and the power supply module can provide alternating current for the induction coil; when the induction coil is electrified, alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, and the alternating magnetic field can generate eddy currents in the refrigerant pipe section, so that the heating and warming effects can be realized by means of the energy of the eddy currents.
It should be understood that the type of the heating device for heating the refrigerant is not limited to the above electromagnetic heating device, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution of the present application and are covered by the protection scope of the present application.
S102: and obtaining the temperature, the heating times and the heating duration of the outdoor coil of the outdoor heat exchanger.
Optionally, a first temperature sensor is disposed at a coil position of an outdoor heat exchanger of the outdoor unit of the air conditioner, and the first temperature sensor may be configured to detect a real-time temperature of the coil position. Thus, the outdoor coil temperature acquired in step S102 may be the real-time temperature of the coil position detected by the first temperature sensor.
The temperature change of the coil pipe position of the outdoor heat exchanger can visually reflect the temperature change condition of the refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor environment temperature and the internal refrigerant temperature, and in addition, the temperature change condition is generally a pipeline part of the outdoor heat exchanger, which is easy to cause the frosting problem. Therefore, the acquired temperature of the outdoor coil can be used as a reference factor for measuring the frosting influence of the inside and the outside of the air conditioner on the outdoor heat exchanger.
The heating times are the heating times for heating the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner within the preset time; the heating time is the last heating time for heating the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner.
The method comprises the steps of controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner, and increasing the temperature of the refrigerant flowing into the outdoor heat exchanger so as to melt the frost of the outdoor heat exchanger by utilizing the heat of the refrigerant after the temperature is increased. In the case of incomplete defrosting, frequent heating defrosting and prolonged defrosting time by single heating may be caused. Therefore, the heating times and the heating time can be used as reference factors for whether the heating defrosting operation is thorough in defrosting.
S103: and under the condition that the temperature, the heating times and the defrosting time of the outdoor coil meet first preset conditions, controlling the air conditioner to enter a reverse circulation defrosting mode.
The reverse circulation defrosting mode comprises the step of controlling the flow direction of a refrigerant of the air conditioner to be switched to the flow direction opposite to the heating mode; in the mode flow, the high-temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger, so that the defrosting operation of the outdoor heat exchanger can be realized by utilizing the heat of the high-temperature refrigerant.
Optionally, the first preset condition is:
T1≤T01，t1≥t01，N1≥N01and t is2≥t02
Wherein, T1For outdoor heat exchangersTemperature of outdoor coil, T01Is a first predetermined temperature, t1Is T1≤T01Duration of (d), t01For a first predetermined duration, N1Number of times of heating for heating refrigerant flowing through refrigerant outflow line of outdoor heat exchanger, N01For a predetermined number of heating times, t2Is the Nth1The heating time t for heating the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger02Is a second preset duration.
Optionally, the first predetermined temperature is in the range of [3 ℃, 6 ℃ (DEG C: centigrade), e.g., 3 ℃, 4 ℃, 5 ℃, 6 ℃; the value range of the first preset time length is [50s, 70s ] (s: s), for example, 50s, 60s, 70 s; the value range of the second preset time is [2min, 4min ] (min: min), for example, 2min, 3min, 4 min; the preset heating times range from [2, 4 ], for example, 2, 3, 4.
For example, when the temperature of the outdoor coil is not more than 5 degrees for 60 seconds continuously, the heating times are more than 3 times, and the 3 rd humidifying time is more than 3 minutes, the air conditioner is controlled to enter the reverse cycle defrosting mode.
Optionally, the controlling of the heating of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger includes:
determining heating parameters for heating according to the temperature difference between the initial refrigerant outlet temperature of the outdoor heat exchanger and the refrigerant outlet temperature of the outdoor heat exchanger;
controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger according to the heating parameters;
wherein the heating parameter comprises a target heating rate, a target heating time length or a target heating discontinuous time length.
Optionally, a second temperature sensor is disposed in the outdoor heat exchanger of the outdoor unit, and the second temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger. Therefore, the obtained refrigerant outlet liquid temperature of the outdoor heat exchanger can be the real-time temperature of the refrigerant detected by the second temperature sensor. Here, the refrigerant outflow line is a line through which the refrigerant flows out of the outdoor heat exchanger when the air conditioner operates in the heating mode.
When the air conditioner needs defrosting, the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger is controlled to be heated, and the initial refrigerant liquid outlet temperature of the outdoor heat exchanger is the refrigerant liquid outlet temperature under the condition that the outdoor heat exchanger is frosted. Along with the heating defrosting operation, the temperature of the refrigerant outlet liquid of the outdoor heat exchanger is gradually increased. Therefore, the temperature difference (first temperature difference) between the initial refrigerant outlet temperature and the refrigerant outlet temperature of the outdoor heat exchanger can reflect the defrosting condition of the air conditioner. If the first temperature difference is smaller, the frosting degree of the outdoor heat exchanger of the air conditioner is more serious, and at the moment, the heating rate needs to be improved, the heating time length needs to be increased, the heating interruption time length needs to be shortened, and the defrosting needs to be accelerated; the first temperature difference is larger, so that the frosting degree of the outdoor heat exchanger of the air conditioner is lower, the heating rate can be properly reduced, the heating time is shortened, the heating interruption time is increased, and the energy-saving effect is achieved. Thus, a heating parameter for heating may be determined based on the first temperature difference. Heating is carried out according to corresponding heating parameters, and the running power consumption of a heating device for heating a refrigerant is reduced as much as possible under the condition of ensuring the normal defrosting of the air conditioner, so that the energy-saving effect is achieved.
Optionally, determining the target heating rate according to the first temperature difference comprises:
and acquiring a corresponding heating rate from the heating rate correlation according to the first temperature difference, and taking the heating rate as a target heating rate.
The heating rate correlation includes a correspondence between one or more first temperature differences and a heating rate. For example, Table 1 shows an alternative first temperature difference versus heating rate (where Δ T1＝T2-TInitial，ΔT1Is the temperature difference between the initial refrigerant outlet temperature and the refrigerant outlet temperature, T, of the outdoor heat exchangerInitialInitial refrigerant outlet temperature of the outdoor heat exchanger):
table 1: correlation of heating rates
| First temperature difference (Unit:. degree. C.) | Heating Rate (Unit:. degree. C/min) |
| a11<ΔT1≤a12 | V1 |
| a12<ΔT1≤a13 | V2 |
| a13<ΔT1 | V3 |
The heating rate is related to the first temperature difference in a negative correlation. That is, the greater the first temperature difference, the smaller the heating rate; the smaller the first temperature difference, the greater the heating rate.
Optionally, determining the target heating time period according to the first temperature difference comprises:
and according to the first temperature difference, acquiring corresponding heating time length from the correlation of the heating time lengths and taking the heating time length as a target heating time length.
The heating time length correlation comprises the corresponding relation between one or more first temperature difference values and the heating time length. For example, table 2 shows an alternative first temperature difference versus heating time period:
table 2: correlation of heating duration
| First temperature difference (Unit:. degree. C.) | Heating time (unit: min) |
| a11<ΔT1≤a12 | t11 |
| a12<ΔT1≤a13 | t12 |
| a13<ΔT1 | t13 |
In the correlation relationship of the heating time length, the heating time length is in negative correlation with the first temperature difference value. That is, the larger the first temperature difference is, the smaller the heating time period is; the smaller the first temperature difference, the longer the heating period.
Optionally, determining the target heating intermittent duration according to the first temperature difference comprises:
and according to the first temperature difference, acquiring corresponding heating discontinuous time length from the correlation of the heating discontinuous time lengths and taking the heating discontinuous time length as a target heating discontinuous time length.
The heating interruption time length correlation comprises a corresponding relation between one or more first temperature difference values and the heating interruption time length. For example, table 3 shows an alternative first temperature difference versus heating interval duration:
table 3: correlation of heating interruption time
| First temperature difference (unit)：℃) | Heating interruption time (unit: min) |
| a11<ΔT1≤a12 | t21 |
| a12<ΔT1≤a13 | t22 |
| a13<ΔT1 | t23 |
In the correlation relationship of the heating interruption time length, the heating interruption time length is in positive correlation with the first temperature difference value. That is, the larger the first temperature difference is, the longer the heating interruption time period is; the smaller the first temperature difference, the smaller the heating interruption period.
Optionally, controlling the compressor down-conversion operation comprises:
and under the condition that the temperature difference value between the outdoor coil pipe temperature and the outdoor environment temperature is smaller than a preset temperature difference threshold value, controlling the compressor to perform frequency reduction operation.
Optionally, the outdoor unit of the air conditioner is provided with a third temperature sensor, and the third temperature sensor can be used for detecting the outdoor environment temperature. Thus, the acquired outdoor ambient temperature may be the real-time temperature detected by the third temperature sensor.
Optionally, the preset temperature difference threshold value is in a range of [15 ℃, 25 ℃ (DEG C: centigrade) ], for example, 15 ℃, 20 ℃, 25 ℃.
The temperature difference (second temperature difference) between the temperature of the outdoor coil and the temperature of the outdoor environment is smaller than the preset temperature difference threshold, which indicates that the air conditioner is affected by frosting of the outdoor heat exchanger of the air conditioner, and the heating capacity is reduced. Therefore, the frequency reduction operation of the compressor is controlled, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced, and the frosting condition of the outdoor heat exchanger is improved.
Optionally, controlling the compressor down-conversion operation comprises:
acquiring a target frequency reduction value according to the second temperature difference;
and controlling the compressor to carry out frequency reduction operation according to the target frequency reduction value based on the current running frequency of the compressor.
If the second temperature difference is smaller, the heating capacity of the air conditioner is poorer, the frosting degree of the outdoor heat exchanger of the air conditioner is more serious, and at the moment, the set frequency reduction value of the compressor is larger, so that the defrosting is accelerated; if the second temperature difference is larger, the heating capacity is better, the frosting degree of the outdoor heat exchanger of the air conditioner is lighter, the frequency reduction value of the compressor can be properly reduced, and the influence of the frequency reduction of the compressor on the normal heating performance of the air conditioner is reduced. Accordingly, the target down-frequency value of the compressor may be determined according to the second temperature difference value.
Optionally, obtaining the target down-conversion value according to the second temperature difference includes:
and acquiring a corresponding down-conversion value from the down-conversion value incidence relation according to the second temperature difference value, and taking the down-conversion value as a target down-conversion value.
The correlation relationship of the frequency reduction values comprises the corresponding relationship between one or more second temperature difference values and the frequency reduction values. For example, an optional second temperature difference versus down-frequency (where Δ T is2＝T1-T3，ΔT2Is a second temperature difference, T3Outdoor ambient temperature):
table 2: correlation of down-conversion values
| Second temperature difference (Unit:. degree. C.) | Frequency reduction value (Unit: Hz) |
| a21<ΔT2≤a22 | Δh1 |
| a22<ΔT2≤a23 | Δh2 |
| a23<ΔT2 | Δh3 |
In the relationship of the frequency reduction value, the frequency reduction value is negatively correlated with the second temperature difference value. Namely, the larger the second temperature difference is, the smaller the frequency reduction value is; and the smaller the second temperature difference, the larger the down-conversion.
In some embodiments, after controlling the heating of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger, the method further includes:
obtaining the refrigerant outlet temperature of the outdoor heat exchanger;
and under the condition that the refrigerant liquid outlet temperature meets a second preset condition, controlling to stop heating the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger.
The temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency of the outdoor heat exchanger and the outdoor environment, and the heat exchange efficiency is influenced by the frosting degree of the outdoor heat exchanger; here, when the frost formation degree of the air conditioner is low and the thickness of the frost is thin, the influence of the frost on heat exchange is small, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is large; under the conditions of high frosting degree and thick frost thickness of the air conditioner, the influence of the frost on heat exchange is large, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is small. Therefore, the obtained refrigerant outlet liquid temperature can be used as a reference factor for measuring the frosting degree of the air-conditioning heat exchanger.
Optionally, the second preset condition is:
T2≥T02and t is3≥t03
Wherein, T2For the refrigerant outlet temperature, T, of the outdoor heat exchanger02Is a second predetermined temperature, t3Is T2≥T02Duration of (d), t03A third preset duration.
In the second preset condition, the refrigerant outlet temperature of the outdoor heat exchanger is greater than the second preset temperature, and the duration is greater than the third preset duration, so that the condition that the heating performance of the outdoor heat exchanger recovers at least frost or no frost can be reflected. Therefore, the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner can be stopped, the power consumption of the heating device for heating the refrigerant is reduced, and the running cost of the air conditioner is reduced.
Fig. 2 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control method for defrosting an air conditioner, as shown in fig. 2, including the following steps:
s201: and judging whether the air conditioner needs to be defrosted or not.
S202: and under the condition that the air conditioner needs defrosting, controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger of the air conditioner and controlling the frequency reduction operation of the compressor of the air conditioner.
S203: and obtaining the refrigerant outlet liquid temperature of the outdoor heat exchanger.
S204: and judging whether the temperature of the refrigerant outlet liquid meets a second preset condition.
S205: and under the condition that the refrigerant liquid outlet temperature meets a second preset condition, controlling to stop heating the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger.
S206: and obtaining the temperature, the heating times and the heating duration of the outdoor coil of the outdoor heat exchanger.
S207: and judging whether the temperature, the heating times and the defrosting time of the outdoor coil meet first preset conditions or not.
S208: and under the condition that the temperature, the heating times and the defrosting time of the outdoor coil meet first preset conditions, controlling the air conditioner to enter a reverse circulation defrosting mode.
In the embodiment, the time when the air conditioner enters the reverse-circulation defrosting mode is comprehensively judged by using the parameters of the temperature of the outdoor coil of the outdoor heat exchanger, the heating times of the heating device and the heating duration, the air conditioner is controlled to enter the reverse-circulation defrosting mode under the condition that the air conditioner is frosted and other defrosting modes with small influence on normal heating of the air conditioner are not defrosted completely, the control precision for controlling the air conditioner to enter the reverse-circulation defrosting mode is improved, and the large influence on the normal heating performance of the air conditioner caused by the fact that the air conditioner runs the reverse-circulation defrosting mode when the outdoor heat exchanger needs defrosting is avoided.
Fig. 3 is a schematic structural diagram of a control device for defrosting of an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides a control device for defrosting of an air conditioner, which is structurally shown in fig. 3 and includes:
a processor (processor)30 and a memory (memory)31, and may further include a Communication Interface (Communication Interface)32 and a bus 33. The processor 30, the communication interface 32 and the memory 31 may communicate with each other through a bus 33. Communication interface 32 may be used for information transfer. The processor 30 may call logic instructions in the memory 31 to perform the control method for air conditioner defrosting of the above-described embodiment.
In addition, the logic instructions in the memory 31 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 31 is a computer-readable storage medium and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 30 executes functional applications and data processing by executing program instructions/modules stored in the memory 31, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 31 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 31 may include a high-speed random access memory, and may also include a nonvolatile memory.
Fig. 4 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
An embodiment of the present disclosure provides an air conditioner, as shown in fig. 4, including:
a refrigerant circulation circuit formed by connecting an outdoor heat exchanger 41, an indoor heat exchanger 42, a throttling device 43 and a compressor 44 through refrigerant pipelines;
the heating device 45 is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 41 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
the control device 46 for defrosting the air conditioner is electrically connected to the heating device 45 and the compressor 44.
According to the air conditioner provided by the embodiment of the disclosure, the time when the air conditioner enters the reverse cycle defrosting mode is comprehensively judged by using the parameters of the temperature of the outdoor coil of the outdoor heat exchanger, the heating times of the heating device and the heating duration, so that the control precision of controlling the air conditioner to enter the reverse cycle defrosting mode is improved; the temperature of the refrigerant flowing back to the compressor is increased by heating the refrigerant flowing through the refrigerant liquid outlet pipeline, so that the heating efficiency is improved, and the adverse effect of frost condensation on the heating performance of the air conditioner is reduced; meanwhile, the heat exchange quantity between the outdoor heat exchanger and the outdoor environment is reduced through the frequency reduction operation of the compressor, and the adverse effects of temperature factors such as too low temperature on the outer surface of the outdoor heat exchanger and the like caused by a large amount of heat absorption are further reduced, so that the frosting condition of the outdoor heat exchanger is improved, and the adverse effects of frost condensation on the heating performance of the air conditioner are reduced.
The embodiment of the disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the control method for defrosting an air conditioner.
An embodiment of the present disclosure provides a computer program product including a computer program stored on a computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to execute the above control method for defrosting an air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (7)
1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
under the condition that the air conditioner needs defrosting, controlling to heat the refrigerant flowing through a refrigerant liquid outlet pipeline of an outdoor heat exchanger of the air conditioner and controlling to perform frequency reduction operation on a compressor of the air conditioner;
the control is to the refrigerant heating of the refrigerant outlet pipe way that flows through outdoor heat exchanger, includes:
determining heating parameters for heating according to the temperature difference between the initial refrigerant outlet temperature of the outdoor heat exchanger and the real-time refrigerant outlet temperature of the outdoor heat exchanger;
controlling the heating of the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger according to the heating parameters;
wherein the heating parameters comprise a target heating rate, a target heating time length and a heating interruption time length;
the target heating duration is the corresponding heating duration obtained from the correlation relationship of the heating durations and is used as the target heating duration;
after controlling the refrigerant heating of the refrigerant liquid outlet pipeline flowing through the outdoor heat exchanger, the method comprises the following steps:
obtaining the refrigerant outlet temperature of the outdoor heat exchanger;
under the condition that the refrigerant liquid outlet temperature meets a second preset condition, controlling to stop heating the refrigerant flowing through the refrigerant liquid outlet pipeline of the outdoor heat exchanger;
the second preset condition is as follows:
T 2≥T 02and is andt 3≥t 03
wherein the content of the first and second substances,T 2the temperature of the refrigerant outlet liquid of the outdoor heat exchanger,T 02is the second preset temperature, and is the first preset temperature,t 3is composed ofT 2≥T 02The duration of the time period of (c) is,t 03a third preset duration;
obtaining the temperature, the heating times and the heating duration of an outdoor coil of the outdoor heat exchanger;
under the condition that the temperature of the outdoor coil, the heating times and the heating duration meet first preset conditions, controlling the air conditioner to enter a reverse circulation defrosting mode;
the first preset condition is as follows:
T 1≤T 01，t 1≥t 01，N 1≥N 01and is andt 2≥t 02
wherein the content of the first and second substances,T 1is the outdoor coil temperature of the outdoor heat exchanger,T 01is a first preset temperature, and is a second preset temperature,t 1is composed ofT 1≤T 01The duration of the time period of (c) is,t 01is a first preset time period and is used for setting the time period,N 1in order to heat the refrigerant flowing through the refrigerant outflow line of the outdoor heat exchanger,N 01the number of times of heating is preset,t 2is as followsN 1The heating time for heating the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger,t 02is a second preset duration.
2. The method of claim 1, wherein controlling the compressor down-conversion operation comprises:
and under the condition that the temperature difference value between the outdoor coil pipe temperature and the outdoor environment temperature is smaller than a preset temperature difference threshold value, controlling the compressor to carry out frequency reduction operation.
3. The method of claim 2, wherein controlling the compressor down-conversion operation comprises:
acquiring a target frequency reduction value according to the temperature difference between the outdoor coil temperature and the outdoor environment temperature;
and controlling the compressor to carry out frequency reduction operation according to the target frequency reduction value based on the current running frequency of the compressor.
4. The control method of claim 3, wherein obtaining the target down-conversion value according to a temperature difference between an outdoor coil temperature and an outdoor ambient temperature comprises:
acquiring a corresponding frequency reduction value from the frequency reduction value incidence relation according to the temperature difference between the outdoor coil pipe temperature and the outdoor environment temperature;
and taking the frequency reduction value as the target frequency reduction value.
5. The control method of claim 4, wherein the down-conversion correlation is such that the temperature difference between the outdoor coil temperature and the outdoor ambient temperature is inversely related to the down-conversion.
6. A control apparatus for air conditioner defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting according to any one of claims 1 to 5 when executing the program instructions.
7. An air conditioner, comprising:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the heating device is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;
a control apparatus for defrosting an air conditioner in accordance with claim 6, electrically connected to said compressor and said heating means.
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| CN111397101B (en) * | 2020-03-16 | 2021-10-29 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and air conditioner |
| CN111649452B (en) * | 2020-05-20 | 2021-11-23 | 宁波奥克斯电气股份有限公司 | Air conditioner auxiliary defrosting method, control device, storage medium and air conditioner |
| CN115493220A (en) * | 2022-09-26 | 2022-12-20 | 宁波奥克斯电气股份有限公司 | Hot water control method in defrosting state and air conditioning system |
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Effective date of registration: 20211202 Address after: No.1 Gangcheng South Road, Jiangbei District, Chongqing, 400026 Applicant after: CHONGQING HAIER AIR-CONDITIONER Co.,Ltd. Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant before: Haier Zhijia Co., Ltd |
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