CN110513818B - Air conditioner refrigeration or heating control method, air conditioner and storage medium - Google Patents
Air conditioner refrigeration or heating control method, air conditioner and storage medium Download PDFInfo
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- CN110513818B CN110513818B CN201910813427.6A CN201910813427A CN110513818B CN 110513818 B CN110513818 B CN 110513818B CN 201910813427 A CN201910813427 A CN 201910813427A CN 110513818 B CN110513818 B CN 110513818B
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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
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
Abstract
The invention discloses an air conditioner refrigeration or heating control method, an air conditioner and a storage medium, wherein the method comprises the following steps: when the air conditioner runs, the refrigerating or heating air suction superheat degree of the air conditioner is obtained, the refrigerating or heating air suction superheat degree is compared with a preset refrigerating or heating target air suction superheat degree, and the opening degree of an electronic expansion valve of the air conditioner is controlled according to a comparison result. According to the invention, the opening degree of the electronic expansion valve of the air conditioner is controlled by respectively setting the suction superheat degrees during refrigeration and heating and comparing the suction superheat degree with the preset standard suction superheat degree, so that the system keeps better circulating refrigerant quantity, the refrigeration or heating efficiency is improved, a low-pressure sensor is not required to be independently arranged to judge the circulating refrigerant quantity state of the system, the reduction of air conditioner components is realized, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner cooling or heating control method, an air conditioner and a storage medium.
Background
In the prior art, a low-pressure sensor is arranged on a gas-liquid separator and a compressor pipeline of an outdoor unit and used for detecting the low pressure of a system, so that the state of a refrigerant in front of a compressor of an air conditioning system is judged, the opening degree of an electronic expansion valve of the system is controlled, the system keeps better circulating refrigerant quantity, and a better refrigerating or heating effect is kept. However, the low-voltage sensor is arranged, so that components used by the air conditioner are increased, the failure rate is improved, and the cost of the whole air conditioner is increased.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The present invention provides a method for controlling cooling or heating of an air conditioner, an air conditioner and a storage medium, which aims to solve the problems of high failure rate and high cost caused by the need of a low pressure sensor to determine the amount of a circulating refrigerant of an air conditioning system so as to control the opening of an electronic expansion valve in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an air-conditioning refrigeration control method comprises the following steps:
when the air conditioner is refrigerating, acquiring the refrigerating suction superheat degree of the air conditioner;
and comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the refrigeration suction superheat degree and the refrigeration target suction superheat degree.
The air conditioner refrigeration control method comprises the following steps of:
acquiring the outlet temperature of an evaporator coil of the indoor unit of the air conditioner and the inlet temperature of the evaporator coil of the indoor unit;
and acquiring the superheat degree of the refrigeration suction air according to the outlet temperature of the evaporator coil and the inlet temperature of the evaporator coil.
The air conditioner refrigeration control method comprises the following specific steps of comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree:
acquiring the exhaust superheat degree of the air conditioner, and correcting the refrigeration target suction superheat degree according to the exhaust superheat degree;
and comparing the refrigerating suction superheat degree with the corrected refrigerating target suction superheat degree.
The air conditioner refrigeration control method comprises the following steps of obtaining the exhaust superheat degree of the air conditioner, and correcting the refrigeration suction superheat degree according to the exhaust superheat degree:
acquiring the exhaust temperature and the high-pressure saturation temperature of a compressor of the air conditioner, and acquiring the exhaust superheat degree according to the exhaust temperature and the high-pressure saturation temperature of the compressor;
acquiring a refrigerating target suction superheat correction value according to a pre-established corresponding relation between the exhaust superheat and a refrigerating target suction superheat correction value;
and correcting the refrigerating target suction superheat degree according to the refrigerating target suction superheat degree correction value.
The air conditioner refrigeration control method, wherein the controlling the opening degree of the electronic expansion valve of the air conditioner according to the comparison result of the refrigeration suction superheat degree and the refrigeration target suction superheat degree specifically comprises the following steps:
when the refrigerating suction superheat degree is smaller than the corrected refrigerating target suction superheat degree, controlling the opening degree of an electronic expansion valve of the indoor unit to be reduced;
when the corrected refrigeration suction superheat degree is equal to the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be unchanged;
and when the corrected refrigeration suction superheat degree is larger than the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be increased.
An air conditioner heating control method, wherein the air conditioner heating control method comprises the following steps:
when an air conditioner heats, acquiring the heating suction superheat degree of the air conditioner;
and comparing the heating air suction superheat degree with a preset heating target air suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the heating air suction superheat degree and the heating target air suction superheat degree.
The air conditioner heating control method comprises the following steps of:
acquiring the temperature of an inlet pipe of a gas-liquid separator of the outdoor unit of the air conditioner and the temperature of an outlet pipe of a heat exchanger of the outdoor unit;
and acquiring the superheat degree of the heating suction gas according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger.
The air conditioner heating control method, wherein the obtaining of the heating suction superheat degree according to the gas-liquid separator inlet pipe temperature and the heat exchanger outlet pipe temperature specifically comprises:
acquiring the actual operation load of the air conditioner, and correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load;
and acquiring the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the corrected temperature of the outlet pipe of the heat exchanger.
The air conditioner heating control method, wherein the correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load specifically includes:
acquiring the ratio of the actual operation load to the rated operation load of the air conditioner;
acquiring a heat exchanger outlet pipe temperature correction value according to a corresponding relation between the ratio and the heat exchanger outlet pipe temperature correction value which is established in advance;
and correcting the temperature of the outlet pipe of the heat exchanger according to the temperature correction value of the outlet pipe of the heat exchanger.
The air conditioner heating control method, wherein the controlling of the electronic expansion valve of the air conditioner according to the comparison result of the heating intake superheat degree and the heating target intake superheat degree specifically comprises:
when the heating suction superheat degree is smaller than the heating target suction superheat degree, controlling the opening degree of the electronic expansion valve of the outdoor unit to be reduced;
when the heating suction superheat degree is equal to the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be unchanged;
and when the heating suction superheat degree is larger than the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be increased.
An air conditioner includes an indoor unit and an outdoor unit, wherein the indoor unit includes: a processor, a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps in the air conditioner cooling control method as described above and/or the steps in the air conditioner heating method as described above.
A computer readable storage medium, wherein the computer readable storage medium stores one or more programs which are executable by one or more processors to implement the steps in the air conditioning cooling control method as described above and/or the steps in the air conditioning heating method as described above.
Has the advantages that: compared with the prior art, the air conditioner refrigeration or heating control method, the air conditioner and the storage medium provided by the invention have the advantages that the suction superheat degrees during refrigeration and heating are respectively set, and the opening degree of the electronic expansion valve of the air conditioner is controlled by comparing the suction superheat degree with the preset standard suction superheat degree, so that the system keeps better circulating refrigerant quantity, the refrigeration or heating efficiency is improved, a low-pressure sensor is not required to be independently arranged to judge the circulating refrigerant quantity state of the system, the reduction of air conditioner components is realized, and the cost is reduced.
Drawings
Fig. 1 is a flowchart of a refrigeration control method of an air conditioner according to a preferred embodiment of the present invention.
Fig. 2 is a flowchart of step S121 in the preferred embodiment of the air-conditioning refrigeration control method according to the present invention.
Fig. 3 is a flowchart of a heating control method of an air conditioner according to a preferred embodiment of the present invention.
FIG. 4 is a flowchart of step S212 in the preferred embodiment of the heating control method for air conditioner according to the present invention
Fig. 5 is a schematic structural diagram of an air conditioning indoor unit according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The suction superheat degree of an air conditioning system is a common parameter in the air conditioning industry and is an important judgment parameter of the refrigerant circulation quantity of the air conditioning system, in the prior art, the suction superheat degree is obtained by a difference value of inlet pipe temperature of a gas-liquid separator and saturation temperature corresponding to low pressure, specifically, a low-pressure sensor is arranged between the gas-liquid separator and a compressor of an air conditioning outdoor unit to obtain the saturation temperature corresponding to the low pressure, so that the suction superheat degree of the system is obtained, the state of the refrigerant circulation quantity of the air conditioning system is judged, and the opening degree of an electronic expansion valve of the outdoor unit is adjusted, so that the system can keep better refrigerant circulation quantity.
The air conditioner refrigeration or heating control method provided by the invention uses other temperature values to replace low-pressure saturation temperature in the prior art to calculate refrigeration suction superheat or heating suction superheat, and controls the opening of the electronic expansion valve according to the refrigeration suction superheat or heating suction superheat so as to achieve the purposes of eliminating a low-pressure sensor and reducing the number of components and cost.
Example one
In an embodiment, an air-conditioning refrigeration control method is provided, please refer to fig. 1, and fig. 1 is a flowchart of a preferred embodiment of the air-conditioning refrigeration control method according to the present invention. The method comprises the following steps:
and S110, acquiring the refrigerating suction superheat degree of the air conditioner when the air conditioner is refrigerating.
Specifically, in the cooling mode, the evaporation and heat absorption of the refrigerant of the air conditioner are realized in an evaporator of the indoor unit, and the circulating refrigerant quantity of the air conditioner is controlled by an electronic expansion valve of the indoor unit. After the air conditioner is started to operate, the opening of an electronic expansion valve of an indoor unit of the air conditioner is maintained at an initial set value, for example, 200pls, for a period of time until the compressor operates stably. And after the compressor operates stably, the opening of the electronic expansion valve of the air conditioner is controlled, so that the air conditioning system maintains better circulating refrigerant quantity and the refrigeration efficiency is improved.
The step of obtaining the refrigeration suction superheat degree of the air conditioner specifically comprises the following steps:
s111, acquiring the outlet temperature of an evaporator coil of the indoor unit of the air conditioner and the inlet temperature of the evaporator coil of the indoor unit;
and S112, acquiring the refrigerating suction superheat degree according to the outlet temperature of the evaporator coil and the inlet temperature of the evaporator coil.
When the air conditioner is refrigerating, the refrigerant enters the evaporator from the inlet of the evaporator coil and leaves the evaporator from the outlet of the evaporator coil, and the refrigerant is gasified and released in the evaporator coil, so that the temperature difference exists between the outlet of the evaporator coil and the inlet of the evaporator coil, and the difference between the outlet temperature of the evaporator coil and the inlet temperature of the evaporator coil can reflect the amount of the refrigerant circulating in the evaporator. Therefore, in the present embodiment, the evaporator coil outlet temperature and the evaporator coil inlet temperature are set in place of the saturation temperature corresponding to the low pressure and the gas-liquid separator inlet temperature in the intake superheat calculation method in the related art. Specifically, the degree of superheat of the refrigerant suction air is set to be the difference obtained by subtracting the inlet temperature of the evaporator coil from the outlet temperature of the evaporator coil. In the present embodiment, the refrigerant suction superheat is denoted by Te, the evaporator coil outlet temperature is denoted by T1, and the evaporator coil inlet temperature is denoted by T2, i.e., Te ═ T1-T2.
And S120, comparing the refrigerating suction superheat degree with a preset refrigerating target suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the refrigerating suction superheat degree and the refrigerating target suction superheat degree.
Specifically, the target cooling suction superheat degree is a cooling suction superheat degree when the circulating refrigerant quantity of the indoor unit is normal, and the degree of the circulating refrigerant quantity of the indoor unit can be determined by comparing the cooling suction superheat degree with a preset target cooling suction superheat degree, so as to control the opening degree of the electronic expansion valve of the indoor unit.
When the refrigerating suction superheat degree is smaller than the refrigerating target suction superheat degree, the circulating refrigerant quantity of the indoor unit is excessive, and at the moment, the opening degree of an electronic expansion valve of the indoor unit is controlled to be reduced so that the refrigerant quantity entering the indoor unit is reduced; when the refrigerating suction superheat degree is equal to the target refrigerating suction superheat degree, the circulating refrigerant quantity of the indoor unit is normal, and at the moment, the opening of the electronic expansion valve of the indoor unit is controlled to be unchanged, so that the refrigerant quantity of the indoor unit is maintained to be unchanged; when the refrigerating suction superheat degree is larger than the refrigerating target suction superheat degree, the circulating refrigerant quantity of the indoor unit is too small, and the opening degree of the electronic expansion valve of the indoor unit is controlled to be increased, so that the refrigerant quantity entering the indoor unit is increased.
However, in the above case where there is only one indoor unit in the air conditioning system, the number of indoor units in the central air conditioning system is often one, that is, in one air conditioning system, there are a plurality of indoor units corresponding to one outdoor unit, and in this case, the state of the circulating refrigerant amount of a single indoor unit cannot represent the state of the circulating refrigerant amount of the entire air conditioning system, and there may be a case where the circulating refrigerant amount of a single indoor unit is too large due to uneven refrigerant distribution, but the circulating refrigerant amount of the entire system is too small. When the circulating refrigerant quantity of a certain indoor unit is insufficient, but the whole air conditioning system is in a liquid return state, namely the circulating refrigerant quantity of the air conditioning system is excessive, if the opening degree of an electronic expansion valve of the indoor unit is controlled to be increased at this time, the liquid return degree of the air conditioning system is increased, and the reliability of a compressor is influenced; when the quantity of the circulating refrigerant of a certain indoor unit is insufficient, but the whole air conditioning system is in an overheating state, namely the quantity of the circulating refrigerant of the air conditioning system is too small, if the opening of the electronic expansion valve of the indoor unit is controlled to be reduced, the whole air conditioning system is not favorable for improving the quantity of the circulating refrigerant to weaken the overheating degree of the system. Therefore, in the present embodiment, in order to maintain the stability of the entire air conditioning system, it is necessary to correct the cooling target suction superheat degree in accordance with whether or not the entire system is returned to the liquid or overheated, while considering the cooling suction superheat degree of a single indoor unit.
The step of comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree specifically comprises the following steps:
s121, acquiring the exhaust superheat degree of the air conditioner, and correcting the suction superheat degree of the refrigeration target according to the exhaust superheat degree;
the exhaust superheat degree is an important judgment parameter for judging whether the air conditioning system generates liquid return or overheating. The liquid return refers to a phenomenon that liquid refrigerants of the air conditioning system are not completely evaporated in the evaporator to cause the liquid refrigerants to enter the compressor, and the overheating refers to a phenomenon that the circulating liquid refrigerants of the air conditioning system are insufficient and excessive heat exchange is performed in the evaporator to cause effective heat exchange waste.
The exhaust superheat degree is a difference value between the compressor exhaust temperature and a high-pressure saturation temperature, the high-pressure saturation temperature is a saturation temperature corresponding to the compressor exhaust temperature at a high pressure, and the high-pressure saturation temperature can be obtained through a pressure-enthalpy diagram of a refrigerator, which is the prior art and is not described herein again. When the system returns liquid, the compressor performs liquid compression, the exhaust temperature of the compressor is reduced, the exhaust superheat degree is also reduced, when the air conditioning system is overheated, the exhaust temperature of the compressor is increased, the exhaust superheat degree is also increased, and therefore the size of the exhaust superheat degree can directly reflect whether the air conditioning system returns liquid/overheating and the severity of the return liquid/overheating.
As shown in fig. 2, the step of acquiring the exhaust superheat of the air conditioner and correcting the refrigeration suction superheat according to the exhaust superheat specifically includes the steps of:
s121a, obtaining the discharge temperature and the high-pressure saturation temperature of a compressor of the air conditioner, and obtaining the discharge superheat degree according to the discharge temperature and the high-pressure saturation temperature of the compressor;
specifically, it has been explained above that the discharge superheat is the difference between the compressor discharge temperature and the high-pressure saturation temperature, and in the present embodiment, the discharge superheat is represented by Δ Tp, the compressor discharge temperature is represented by Tp, and the high-pressure saturation temperature is represented by Tc, that is, Δ Tp is Tp-Tc.
S121b, obtaining the refrigerating target suction superheat correction value according to the pre-established corresponding relation between the discharge superheat and the refrigerating target suction superheat correction value.
When the air conditioning system is in a liquid return state, the circulating refrigerant quantity of the air conditioning system is excessive, and the refrigerating target air suction superheat degree is required to be increased at the moment, namely, the refrigerating target air suction superheat degree correction value is a positive value, so that the opening of an electronic expansion valve of the indoor unit is controlled to be increased when the refrigerating air suction superheat degree needs to reach a higher value; when the air conditioning system is in an overheat state, the refrigeration target air suction superheat degree is corrected, and the refrigeration target air suction superheat degree is reduced or maintained, namely the refrigeration target air suction superheat degree correction value is 0 or is a negative value, so that the opening of an electronic expansion valve of the indoor unit is controlled to be increased in time, and the circulating refrigerant quantity of the indoor unit and the circulating refrigerant quantity of the air conditioning system are increased.
As described above, the discharge superheat reflects whether the air conditioning system is in the liquid-return/superheat state and the severity of the liquid-return/superheat state, and therefore, in the present embodiment, the target cooling suction superheat correction value is obtained based on a pre-established correspondence between the discharge superheat and the target cooling suction superheat correction value. The correspondence relationship between the discharge superheat and the target cooling intake superheat correction value is shown in table 1.
TABLE 1
As can be seen from Table 1, when the exhaust superheat degree is in the range of more than 20 and less than or equal to 30, the air-conditioning system is in a state of relatively complete heat exchange efficiency and no liquid return or overheating; when the delta Tp is less than or equal to 20, the air-conditioning system is in a liquid return state, the refrigerating target suction superheat correction value is a positive value, the smaller the delta Tp is, the more serious the liquid return degree is, and the larger the refrigerating target suction superheat correction value is; and when delta Tp is more than 30, the air conditioning system is in an overheating state, the refrigerating target suction superheat correction value is a negative value, the larger delta Tp is, the more serious the overheating degree is, and the smaller the refrigerating target suction superheat correction value is.
It should be noted that the values in table 1 are empirical values, and those skilled in the art can set other corresponding relationships between the discharge superheat and the target cooling suction superheat correction value according to the actual conditions of the air conditioning system, and set different target cooling suction superheat correction values, but the present invention is not limited to the values in table 1.
And S121c, correcting the target refrigeration suction superheat according to the target refrigeration suction superheat correction value.
Specifically, the correction of the target cooling suction superheat is performed by adding the correction value of the target cooling suction superheat to a preset target cooling suction superheat. For example, the preset target cooling intake superheat is 5, the correction value of the target cooling intake superheat obtained from the correspondence between the discharge superheat and the correction value of the target cooling intake superheat is-1, and then the corrected target cooling intake superheat is 4.
And S122, comparing the refrigerating suction superheat degree with the corrected refrigerating target suction superheat degree.
And S123, controlling the opening of the electronic expansion valve of the air conditioner according to the comparison result of the refrigeration suction superheat degree and a preset refrigeration target suction superheat degree.
After the corrected refrigeration target air suction superheat degree is obtained, comparing the refrigeration air suction superheat degree with the corrected refrigeration target air suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to a comparison result, specifically comprising:
when the refrigerating suction superheat degree is smaller than the corrected refrigerating target suction superheat degree, controlling the opening degree of an electronic expansion valve of the indoor unit to be reduced;
when the corrected refrigeration suction superheat degree is equal to the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be unchanged;
and when the corrected refrigeration suction superheat degree is larger than the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be increased.
It can be seen that, in the air-conditioning refrigeration control method provided in this embodiment, when determining the amount of refrigerant circulating in the indoor unit and controlling the opening of the electronic expansion valve of the indoor unit, the values to be obtained include: the evaporator coil outlet temperature, the evaporator coil inlet temperature, the compressor exhaust temperature and the high-pressure saturation temperature, wherein the evaporator coil outlet temperature, the evaporator coil inlet temperature and the compressor exhaust temperature are obtained through temperature sensors arranged at corresponding positions, the high-pressure saturation temperature is obtained through a high-pressure sensor arranged at a compressor and a pressure enthalpy diagram, and in the air conditioning industry, the temperature sensors and the high-pressure sensors arranged at the corresponding positions are components with protection functions and are originally necessary designs of the air conditioning system. That is to say, the air-conditioning refrigeration control method provided by this embodiment realizes the control of the amount of the circulating refrigerant of the air-conditioning system on the basis of not adding components, and realizes the improvement of the refrigeration efficiency of the air-conditioning system.
Example two
Referring to fig. 3, fig. 3 is a flowchart illustrating a heating control method of an air conditioner according to a preferred embodiment of the present invention. The method comprises the following steps:
s210, when the air conditioner heats, obtaining the heating suction superheat degree of the air conditioner.
Specifically, in the heating mode, the evaporation and heat absorption of the refrigerant of the air conditioner are realized in a heat exchanger of the outdoor unit, and the circulating refrigerant quantity of the air conditioner is controlled by an electronic expansion valve of the outdoor unit. After the air conditioner is started to operate, the opening of the electronic expansion valve of the air conditioner maintains an initial set value for a period of time until the compressor operates stably. And after the compressor operates stably, the opening of the electronic expansion valve of the air conditioner is controlled, so that the air conditioning system maintains better circulating refrigerant quantity and improves the heating efficiency.
The step of obtaining the heating suction superheat degree of the air conditioner specifically comprises the following steps:
s211, acquiring the temperature of an inlet pipe of a gas-liquid separator of the outdoor unit of the air conditioner and the temperature of an outlet pipe of a heat exchanger of the outdoor unit;
s212, obtaining the superheat degree of the heating suction gas according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger.
As described above, in the prior art, a low pressure sensor installed between a gas-liquid separator of an outdoor unit of an air conditioner and a compressor acquires a saturation temperature corresponding to a low pressure, thereby acquiring a suction superheat degree determined by a difference between a temperature of an inlet pipe of the gas-liquid separator and the low pressure saturation temperature to determine a state of a refrigerant circulation amount of the air conditioning system. In the present embodiment, the temperature of the outlet pipe of the heat exchanger of the outdoor unit is set instead of the low pressure saturation temperature in the suction superheat calculation method of the related art.
However, in the prior art, since the low pressure sensor is installed on the suction pipe of the compressor, and components such as a four-way valve and a pipeline exist between the low pressure sensor and the outlet pipe of the heat exchanger, and when a refrigerant passes through the components, air pressure and state changes may occur, so that there is an error in replacing the low pressure saturation temperature by the outlet pipe temperature of the heat exchanger.
Specifically, the obtaining of the heating suction superheat degree according to the gas-liquid separator inlet pipe temperature and the heat exchanger outlet pipe temperature is to obtain an actual operation load of the air conditioner, and correct the heat exchanger according to the actual operation load.
As shown in fig. 4, the acquiring the actual operation load of the air conditioner and correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load specifically includes:
s212a, acquiring the ratio of the actual operation load to the rated operation load of the air conditioner;
s212b, obtaining the heat exchanger outlet pipe temperature correction value according to the corresponding relation between the ratio and the heat exchanger outlet pipe temperature correction value which is established in advance.
The actual operation load of the air conditioner means a load generated by an indoor unit actually operating in the air conditioning system. After the ratio of the actual operating load to the rated operating load is obtained, the heat exchanger outlet pipe temperature correction value can be obtained according to the pre-established correspondence between the ratio and the heat exchanger outlet pipe temperature correction value. In the present embodiment, the correspondence between the ratio and the corrected heat exchanger outlet tube temperature value is shown in table 2.
TABLE 2
As can be seen from table 2, when the ratio of the actual operating load to the rated operating load is less than or equal to 30%, the heat exchanger outlet pipe temperature is not different from the low-pressure saturation temperature in the prior art, at this time, the heat exchanger outlet pipe temperature correction value is 0, when the ratio of the actual operating load to the rated operating load is greater than 30%, the heat exchanger outlet pipe temperature is lower than the low-pressure saturation temperature, the heat exchanger outlet pipe temperature correction value is a positive value, and the larger the ratio is, the larger the difference between the heat exchanger outlet pipe temperature and the low-pressure saturation temperature is, the larger the heat exchanger outlet pipe temperature correction value is.
It should be noted that the values in table 2 are empirical values, and those skilled in the art can set other corresponding relationships between the ratio and the corrected heat exchanger outlet pipe temperature value according to the actual conditions of the air conditioning system, and the invention is not limited to the values in table 2.
S212c, correcting the heat exchanger outlet pipe temperature according to the heat exchanger outlet pipe temperature correction value.
Specifically, the correction of the temperature of the outlet pipe of the heat exchanger refers to adding a correction value of the temperature of the outlet pipe of the heat exchanger on the basis of the acquired temperature of the outlet pipe of the heat exchanger. For example, the obtained heat exchanger outlet pipe temperature is 10, the refrigeration target suction superheat correction value obtained from the correspondence between the ratio of the actual operating load to the rated operating load and the heat exchanger outlet pipe temperature correction value is 3, and then the refrigeration target suction superheat after correction is 13.
The obtaining of the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger further comprises:
s212d, acquiring the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the corrected temperature of the outlet pipe of the heat exchanger.
Specifically, the superheat degree of heating suction air is set as a difference value obtained by subtracting the corrected outlet pipe temperature of the heat exchanger from the inlet pipe temperature of the gas-liquid separator. In the present embodiment, the heating intake air superheat degree is denoted by Tf, the gas-liquid separator inlet pipe temperature is denoted by Tq, and the heat exchanger outlet pipe temperature after correction is denoted by T3, that is, Tf is Tq-T3.
S220, comparing the heating air suction superheat degree with a preset heating target air suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the heating air suction superheat degree and the heating target air suction superheat degree.
Specifically, the heating target suction superheat refers to a heating suction superheat when a circulating refrigerant amount of the outdoor unit of the air conditioner is normal, and the amount of the refrigerant circulating in the outdoor unit can be determined by comparing the heating suction superheat with a preset heating target suction superheat, so as to control an opening degree of an electronic expansion valve of the outdoor unit.
In the air conditioning system, one air conditioning system corresponds to one outdoor unit, and therefore, unlike the cooling mode, in the heating mode, the circulating refrigerant of the outdoor unit corresponds to the circulating refrigerant quantity of the entire air conditioning system, and the heating suction superheat degree can be directly compared with the preset heating target suction superheat degree.
The heating target intake superheat may be obtained from a pre-established correspondence between the heating target intake superheat and the exhaust superheat of the air conditioner.
Specifically, the exhaust superheat degree has been explained above: the exhaust superheat degree can directly reflect whether the air conditioning system generates a liquid return/overheating phenomenon and the severity of the liquid return/overheating phenomenon. When the air conditioning system is in a liquid return state, the circulating refrigerant quantity of the air conditioning system is excessive, a higher heating target suction superheat degree is set at the moment, and the opening of an electronic expansion valve of the outdoor unit is controlled to be increased when the heating suction superheat degree needs to reach a higher value; when the air conditioning system is in an overheat state, the lower suction superheat degree of the heating target is set so as to control the opening of the electronic expansion valve of the outdoor unit to be increased in time and increase the circulating refrigerant quantity of the air conditioning system. Therefore, it is necessary to set up different target intake superheat degrees for heating for different exhaust superheat degrees, and in the present embodiment, Δ Tp represents the exhaust superheat degree as well, and the correspondence relationship between the target intake superheat degree for heating and the exhaust superheat degree is shown in table 3.
TABLE 3
| Exhaust superheat degree delta Tp | Air suction superheat degree of heating target |
| ΔTp＜15 | 3 |
| 15≤ΔTp＜25 | 2 |
| 25≤ΔTp＜30 | 1 |
| 30≤ΔTp＜45 | 0 |
| 45≤ΔTp＜50 | －1 |
| ΔTp≥50 | －2 |
It should be noted that the numerical values in table 3 are only empirical values, and those skilled in the art can set other corresponding relationships between the exhaust superheat degree and the heating target intake superheat degree according to the actual conditions of the air conditioning system, and the present invention is not limited to the numerical values in table 3.
When the heating suction superheat degree is smaller than the heating target suction superheat degree, the circulating refrigerant quantity of the outdoor unit is excessive, and at the moment, the opening degree of the electronic expansion valve of the indoor unit is controlled to be reduced, so that the refrigerant quantity entering the outdoor unit is reduced; when the heating suction superheat degree is equal to the heating target suction superheat degree, the circulation refrigerant quantity of the outdoor unit is normal, and at the moment, the opening of the electronic expansion valve of the outdoor unit is controlled to be unchanged, so that the refrigerant quantity of the outdoor unit is maintained to be unchanged; when the heating suction superheat degree is larger than the heating target suction superheat degree, the circulation refrigerant quantity of the outdoor unit is too small, and at the moment, the opening of the electronic expansion valve of the outdoor unit is controlled to be increased, so that the refrigerant quantity entering the outdoor unit is increased. Therefore, in this embodiment, the controlling the opening degree of the electronic expansion valve of the air conditioner according to the comparison result between the heating intake air superheat degree and the heating target intake air superheat degree specifically includes:
when the heating suction superheat degree is smaller than the heating target suction superheat degree, controlling the opening degree of the electronic expansion valve of the outdoor unit to be reduced;
when the heating suction superheat degree is equal to the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be unchanged;
and when the heating suction superheat degree is larger than the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be increased.
It can be seen that, in the air conditioner heating control method provided in this embodiment, when determining the amount of refrigerant circulating in the outdoor unit and controlling the opening of the electronic expansion valve of the outdoor unit, the values to be obtained include: the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger are obtained through temperature sensors arranged at corresponding positions, and in the air conditioning industry, the temperature sensors arranged at the corresponding positions are components with protection functions and are originally necessary designs of the air conditioning system. That is to say, the air-conditioning heating control method provided in this embodiment realizes the control of the amount of the circulating refrigerant of the air-conditioning system on the basis of not adding components, and realizes the improvement of the heating efficiency of the air-conditioning system.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
EXAMPLE III
Based on the air conditioner cooling or heating control method, the invention also provides an air conditioner, which comprises an indoor unit and an outdoor unit, wherein a schematic block diagram of the indoor unit can be shown in fig. 5. The indoor unit comprises a processor, a memory, a network interface, a display screen and a temperature sensor which are connected through a system bus. Wherein, the processor of this indoor set is used for providing calculation and control ability. The memory of the indoor unit comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the indoor unit is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method for controlling cooling or heating of an air conditioner. The display screen of the indoor unit can be a liquid crystal display screen or an electronic ink display screen, and the temperature sensor of the indoor unit is arranged in the air-conditioning indoor unit in advance and used for detecting the current operating temperature of internal equipment.
It will be understood by those skilled in the art that the schematic block diagram shown in fig. 5 is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation to the air conditioner to which the solution of the present invention is applied, and a specific air conditioner indoor unit may include more or less components than those shown in the figure, or combine some components, or have different component arrangements.
In one embodiment, the processor of the air conditioner indoor unit can at least realize the following steps when executing the computer program:
when the air conditioner is refrigerating, acquiring the refrigerating suction superheat degree of the air conditioner;
and comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the refrigeration suction superheat degree and the refrigeration target suction superheat degree.
The step of obtaining the refrigerating suction superheat degree of the air conditioner specifically comprises the following steps:
acquiring the outlet temperature of an evaporator coil of the indoor unit of the air conditioner and the inlet temperature of the evaporator coil of the indoor unit;
and acquiring the superheat degree of the refrigeration suction air according to the outlet temperature of the evaporator coil and the inlet temperature of the evaporator coil.
Wherein, the comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree specifically comprises:
acquiring the exhaust superheat degree of the air conditioner, and correcting the refrigeration target suction superheat degree according to the exhaust superheat degree;
and comparing the refrigerating suction superheat degree with the corrected refrigerating target suction superheat degree.
The step of obtaining the exhaust superheat degree of the air conditioner and correcting the refrigeration suction superheat degree according to the exhaust superheat degree specifically comprises the following steps:
acquiring the exhaust temperature and the high-pressure saturation temperature of a compressor of the air conditioner, and acquiring the exhaust superheat degree according to the exhaust temperature and the high-pressure saturation temperature of the compressor;
acquiring a refrigerating target suction superheat correction value according to a pre-established corresponding relation between the exhaust superheat and a refrigerating target suction superheat correction value;
and correcting the refrigerating target suction superheat degree according to the refrigerating target suction superheat degree correction value.
Wherein the controlling the opening degree of the electronic expansion valve of the air conditioner according to the comparison result of the refrigeration suction superheat degree and the refrigeration target suction superheat degree specifically comprises:
when the refrigerating suction superheat degree is smaller than the corrected refrigerating target suction superheat degree, controlling the opening degree of an electronic expansion valve of the indoor unit to be reduced;
when the corrected refrigeration suction superheat degree is equal to the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be unchanged;
and when the corrected refrigeration suction superheat degree is larger than the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be increased.
When an air conditioner heats, acquiring the heating suction superheat degree of the air conditioner;
and the heating air suction superheat degree is compared with a preset heating target air suction superheat degree, and the opening degree of an electronic expansion valve of the air conditioner is controlled according to the comparison result of the heating air suction superheat degree and the heating target air suction superheat degree.
The acquiring of the heating suction superheat degree of the air conditioner specifically comprises the following steps:
acquiring the temperature of an inlet pipe of a gas-liquid separator of the outdoor unit of the air conditioner and the temperature of an outlet pipe of a heat exchanger of the outdoor unit;
and acquiring the superheat degree of the heating suction gas according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger.
The obtaining of the superheat degree of the heating suction gas according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger specifically comprises the following steps:
acquiring the actual operation load of the air conditioner, and correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load;
and acquiring the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the corrected temperature of the outlet pipe of the heat exchanger.
Wherein, the correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load specifically comprises:
acquiring the ratio of the actual operation load to the rated operation load of the air conditioner;
acquiring a heat exchanger outlet pipe temperature correction value according to a corresponding relation between the ratio and the heat exchanger outlet pipe temperature correction value which is established in advance;
and correcting the temperature of the outlet pipe of the heat exchanger according to the temperature correction value of the outlet pipe of the heat exchanger.
Wherein the controlling the electronic expansion valve of the air conditioner according to the comparison result of the heating intake superheat degree and the heating target intake superheat degree specifically comprises:
when the heating suction superheat degree is smaller than the heating target suction superheat degree, controlling the opening degree of the electronic expansion valve of the outdoor unit to be reduced;
when the heating suction superheat degree is equal to the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be unchanged;
and when the heating suction superheat degree is larger than the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be increased.
Example four
Based on the air-conditioning cooling or heating control method, the invention further provides a computer-readable storage medium, where one or more programs are stored, and the one or more programs can be executed by one or more processors to implement the steps in the air-conditioning cooling control method and/or the air-conditioning heating control method according to the above embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An air conditioner refrigeration control method is characterized by comprising the following steps:
when the air conditioner is refrigerating, acquiring the refrigerating suction superheat degree of the air conditioner;
comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree, and controlling the opening degree of an electronic expansion valve of an indoor unit of the air conditioner according to the comparison result of the refrigeration suction superheat degree and the refrigeration target suction superheat degree;
the step of obtaining the refrigerating suction superheat degree of the air conditioner specifically comprises the following steps:
acquiring the outlet temperature of an evaporator coil of the indoor unit and the inlet temperature of the evaporator coil of the indoor unit;
obtaining the refrigeration suction superheat degree according to the outlet temperature of the evaporator coil and the inlet temperature of the evaporator coil;
the step of comparing the refrigeration suction superheat degree with a preset refrigeration target suction superheat degree specifically comprises the following steps:
acquiring the exhaust superheat degree of the air conditioner, and correcting the refrigeration target suction superheat degree according to the exhaust superheat degree;
comparing the refrigeration suction superheat degree with the corrected refrigeration target suction superheat degree;
the obtaining of the exhaust superheat degree of the air conditioner and the correcting of the refrigeration suction superheat degree according to the exhaust superheat degree specifically comprise:
acquiring the exhaust temperature and the high-pressure saturation temperature of a compressor of the air conditioner, and acquiring the exhaust superheat degree according to the exhaust temperature and the high-pressure saturation temperature of the compressor;
acquiring a refrigerating target suction superheat correction value according to a pre-established corresponding relation between the exhaust superheat and a refrigerating target suction superheat correction value;
correcting the refrigeration target suction superheat degree according to the refrigeration target suction superheat degree correction value;
when the air conditioner is in a liquid return state, the refrigerating target suction superheat correction value is a positive value, and when the air conditioner is in an overheat state, the refrigerating target suction superheat correction value is 0 or a negative value.
2. A refrigeration control method for an air conditioner according to claim 1, wherein said controlling an opening degree of an electronic expansion valve of said air conditioner based on a result of comparing said refrigeration intake superheat degree with said refrigeration target intake superheat degree specifically comprises:
when the refrigerating suction superheat degree is smaller than the corrected refrigerating target suction superheat degree, controlling the opening degree of an electronic expansion valve of the indoor unit to be reduced;
when the corrected refrigeration suction superheat degree is equal to the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be unchanged;
and when the corrected refrigeration suction superheat degree is larger than the corrected refrigeration target suction superheat degree, controlling the opening degree of the electronic expansion valve of the indoor unit to be increased.
3. An air conditioner heating control method is characterized by comprising the following steps:
when an air conditioner heats, acquiring the heating suction superheat degree of the air conditioner;
comparing the heating air suction superheat degree with a preset heating target air suction superheat degree, and controlling the opening degree of an electronic expansion valve of the air conditioner according to the comparison result of the heating air suction superheat degree and the heating target air suction superheat degree;
the step of obtaining the heating suction superheat degree of the air conditioner specifically comprises the following steps:
acquiring the temperature of an inlet pipe of a gas-liquid separator of the outdoor unit of the air conditioner and the temperature of an outlet pipe of a heat exchanger of the outdoor unit;
acquiring the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger;
the obtaining of the superheat degree of the heating suction gas according to the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the heat exchanger specifically comprises the following steps:
acquiring the actual operation load of the air conditioner, and correcting the temperature of the outlet pipe of the heat exchanger according to the actual operation load;
acquiring the superheat degree of the heating suction air according to the temperature of the inlet pipe of the gas-liquid separator and the corrected temperature of the outlet pipe of the heat exchanger;
and the heating suction superheat degree is the difference obtained by subtracting the corrected outlet pipe temperature of the heat exchanger from the inlet pipe temperature of the gas-liquid separator.
4. An air conditioning heating control method according to claim 3, wherein the correcting the heat exchanger outlet pipe temperature according to the actual operating load specifically comprises:
acquiring the ratio of the actual operation load to the rated operation load of the air conditioner;
acquiring a heat exchanger outlet pipe temperature correction value according to a corresponding relation between the ratio and the heat exchanger outlet pipe temperature correction value which is established in advance;
and correcting the temperature of the outlet pipe of the heat exchanger according to the temperature correction value of the outlet pipe of the heat exchanger.
5. An air conditioner heating control method as claimed in claim 4, wherein said controlling an electronic expansion valve of the air conditioner based on the comparison result of the heating intake superheat degree and the heating target intake superheat degree specifically comprises:
when the heating suction superheat degree is smaller than the heating target suction superheat degree, controlling the opening degree of the electronic expansion valve of the outdoor unit to be reduced;
when the heating suction superheat degree is equal to the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be unchanged;
and when the heating suction superheat degree is larger than the heating target suction superheat degree, controlling the opening degree of the outdoor unit electronic expansion valve to be increased.
6. An air conditioner, its includes indoor set and off-premises station, its characterized in that, indoor set includes: a processor, a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps of the air conditioner cooling control method according to any one of claims 1-2 and/or the steps of the air conditioner heating method according to any one of claims 3-5.
7. A computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to perform the steps of the air conditioner cooling control method according to any one of claims 1-2 and/or the steps of the air conditioner heating method according to any one of claims 3-5.
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| CN114264052B (en) * | 2021-12-24 | 2023-03-17 | 珠海格力电器股份有限公司 | Refrigeration control method and air conditioner |
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