CN107228455B - Air conditioner and control method - Google Patents

Air conditioner and control method Download PDF

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Publication number
CN107228455B
CN107228455B CN201710434349.XA CN201710434349A CN107228455B CN 107228455 B CN107228455 B CN 107228455B CN 201710434349 A CN201710434349 A CN 201710434349A CN 107228455 B CN107228455 B CN 107228455B
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Prior art keywords
temperature
outdoor environment
refrigerant
heat dissipation
refrigerant flow
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CN107228455A (en
Inventor
罗荣邦
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Qingdao Haier Air Conditioner Gen Corp Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20Electric components for separate outdoor units
    • F24F1/24Cooling of electric components
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00Details or features not otherwise provided for
    • F24F2221/54Heating and cooling, simultaneously or alternatively
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioner and a control method, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring the outdoor environment temperature of a space where an air conditioner is located; determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value; determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow; and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow. The control method of the invention realizes the heat exchange and cooling of the electric control element by controlling the electric control element to exchange heat with the gaseous refrigerant flowing through the radiator, and adjusts the refrigerant flow for heat radiation according to the outdoor environment temperature, the radiator temperature and the refrigerant temperature, so that the actual cold door flow can meet the cooling requirement, the refrigerant flow can not be wasted, the requirements of reliability and safety are met, the failure rate is reduced, and the comfort level of the air conditioner is improved.

Description

Air conditioner and control method
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method.
Background
In the current fixed-frequency or variable-frequency air conditioner products in the market, when an air conditioner operates, the self work of electric control elements such as a computer board and a single chip microcomputer of the air conditioner can generate a large amount of heat, the temperature of the electric control elements is increased along with the heat, and when the temperature of the electric control elements is too high, a high-temperature protection mechanism for stopping the air conditioner can be triggered. In order to solve the problem of overhigh temperature of the electric control element, a cooling loop is additionally arranged in part of the existing air conditioning system, and the electric control element is cooled by utilizing a refrigerant of an air conditioner.
But current air conditioner product that has cooling circuit sets for the refrigerant flow of fixed aperture for mostly, can't adjust the refrigerant flow according to outer loop temperature, just also can not adjust the temperature of concurrent flow heat exchanger, this just leads to can the problem all when too high or the low excessively of concurrent flow temperature, and the high temperature can't satisfy the cooling requirement, and the low temperature can lead to concurrent flow heat exchanger condensation, and the security variation leads to the inverter board to burn out, and the air conditioner shuts down.
Disclosure of Invention
The invention provides an air conditioner and a control method, and aims to solve the problem that the flow of a refrigerant for heat dissipation of an electric control is not matched with the current working condition. 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 and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the present invention, there is provided a control method of an air conditioner, comprising: acquiring the outdoor environment temperature of a space where an air conditioner is located; determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value; determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow; and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
Further, the first correlation is determined according to a plurality of sets of outdoor ambient temperature, radiator temperature and refrigerant temperature, and includes: determining a heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of radiator temperatures and refrigerant temperatures under different outdoor environment temperatures; determining a first fitting equation of the difference value between the outdoor environment temperature and the heat dissipation temperature according to the multiple groups of outdoor environment temperatures and the corresponding heat dissipation temperature difference values; and taking the first fitting equation as the first incidence relation.
Further, the second correlation is determined according to a plurality of groups of outdoor ambient temperatures, heat dissipation temperature difference values and refrigerant flow, and includes: determining the optimal refrigerant flow corresponding to each group of air conditioners at the outdoor environment temperature when the air conditioners at the outdoor environment temperature reach the heat dissipation temperature difference value according to the plurality of groups of outdoor environment temperatures, the heat dissipation temperature difference value and the refrigerant flow; determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow; and taking the second fitting equation as a second incidence relation.
Further, the determined second fitting equation comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is a refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is an outdoor environment temperature, and y is a heat dissipation temperature difference value.
Further, adjusting the refrigerant flow rate of the cooling pipeline to the target refrigerant flow rate includes: determining the target opening degree of a flow valve arranged on a cooling pipeline according to the target refrigerant flow; the flow valve is adjusted to a target opening.
According to a second aspect of the present invention, there is provided an air conditioner, the air conditioner comprising an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electrical control and a radiator for radiating heat of the electrical control, the radiator being disposed on a cooling pipeline, an inlet end of the cooling pipeline being connected to a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger, an outlet end being connected to an air supplement port of the compressor of the air conditioner; the air conditioner further comprises a temperature sensor and a controller, wherein the temperature sensor is used for: acquiring the outdoor environment temperature of a space where an air conditioner is located; the controller is used for: determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value, wherein the heat dissipation temperature difference value is a difference value between the temperature of a radiator and the temperature of a refrigerant, the temperature of the radiator is the temperature of the radiator used for dissipating heat of an electric control part of the air conditioner, and the temperature of the refrigerant is the temperature of the refrigerant flowing into the radiator; determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow; and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
Further, the first correlation is determined according to a plurality of sets of outdoor ambient temperature, radiator temperature and refrigerant temperature, and includes: determining a heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of radiator temperatures and refrigerant temperatures under different outdoor environment temperatures; determining a first fitting equation of the difference value between the outdoor environment temperature and the heat dissipation temperature according to the multiple groups of outdoor environment temperatures and the corresponding heat dissipation temperature difference values; and taking the first fitting equation as the first incidence relation.
Further, the second correlation is determined according to a plurality of groups of outdoor ambient temperatures, heat dissipation temperature difference values and refrigerant flow, and includes: determining the optimal refrigerant flow corresponding to each group of air conditioners at the outdoor environment temperature when the air conditioners at the outdoor environment temperature reach the heat dissipation temperature difference value according to the plurality of groups of outdoor environment temperatures, the heat dissipation temperature difference value and the refrigerant flow; determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow; and taking the second fitting equation as a second incidence relation.
Further, the determined second fitting equation comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is a refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is an outdoor environment temperature, and y is a heat dissipation temperature difference value.
Further, the controller adjusts the refrigerant flow rate of the cooling pipeline to the target refrigerant flow rate, and the method includes: determining the target opening degree of a flow valve arranged on a cooling pipeline according to the target refrigerant flow; the flow valve is adjusted to a target opening.
The control method of the invention realizes the heat exchange and cooling of the electric control element by controlling the electric control element to exchange heat with the gaseous refrigerant flowing through the radiator, and adjusts the refrigerant flow for heat radiation according to the outdoor environment temperature, the radiator temperature and the refrigerant temperature, so that the actual cold door flow can meet the cooling requirement, the refrigerant flow can not be wasted, the requirements of reliability and safety are met, the failure rate is reduced, and the comfort level of the air conditioner is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a control method of the present invention according to an exemplary embodiment;
FIG. 2 is a graph illustrating a variation of a difference in heat dissipation temperature with an outdoor ambient temperature, in accordance with an exemplary embodiment;
FIG. 3 is a graph illustrating a variation of an outdoor ambient temperature, a heat rejection temperature differential value, and a flow opening of a flow valve in accordance with an exemplary embodiment;
fig. 4 is a schematic structural view of an air conditioner of the present invention according to an exemplary embodiment.
FIG. 5 is a pressure-enthalpy diagram illustrating a refrigerant cycle in the air conditioner of the present invention according to an exemplary embodiment;
fig. 6 is a temperature entropy diagram illustrating a refrigerant cycle in an air conditioner according to the present invention, according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention 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 embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. 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. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 is a flow chart illustrating a control method of the present invention in an exemplary embodiment.
The invention provides a control method of an air conditioner, which can be used for controlling operation flows of heat dissipation, cooling and the like of an electric control element of the air conditioner, and specifically comprises the following steps:
s101, acquiring the outdoor environment temperature of a space where an air conditioner is located;
in tropical areas in south China or under the condition of high-temperature climate in summer, the heat exchange quantity between the outdoor heat exchanger of the outdoor unit and the outdoor environment is influenced by the temperature of the outdoor environment. When the outdoor environment temperature rises, the heat dissipation temperature of an electric control part arranged in the outdoor unit also rises, and the heat dissipated to the outdoor environment by the electric control part is reduced; therefore, the outdoor ambient temperature is an important factor affecting the amount of heat dissipation of the electrical control.
In an embodiment, a temperature sensor is disposed on an outdoor unit of the air conditioner and is configured to detect a real-time outdoor ambient temperature, so that the air conditioner can adjust an amount of refrigerant used for cooling the electrical control according to parameters such as the outdoor ambient temperature.
S102, determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value;
the heat dissipation temperature difference value is a difference value between the temperature of the heat sink and the temperature of a refrigerant, the temperature of the heat sink is the temperature of the heat sink for dissipating heat of an electric control part of the air conditioner, and the heat sink performs heat exchange with the electric control part to dissipate heat of the electric control part, so that the temperature of the heat sink can reflect the current temperature of the electric control part to a certain extent.
The refrigerant temperature is the temperature of the refrigerant flowing into the heat sink, i.e., the initial temperature of the refrigerant that has not absorbed the heat of the electronic control unit. Therefore, the heat dissipation temperature difference can reflect the temperature difference degree between the electric control and the input refrigerant; the larger the heat dissipation temperature difference value is, the more the temperature difference between the two is, and the more the heat absorbed by the refrigerant when flowing through the radiator is.
In an embodiment, the radiator is arranged on a cooling pipeline, the inlet end of the cooling pipeline is connected to a refrigerant pipeline between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner, and the outlet end of the cooling pipeline is connected to an air supplement port of a compressor of the air conditioner; therefore, the source of the refrigerant for dissipating heat of the electric control part is that the outdoor heat exchanger is part of the refrigerant flowing from the outdoor heat exchanger to the indoor heat exchanger in the air conditioner refrigeration mode. And the refrigerant after the heat absorption of the radiator can continuously flow into the compressor of the air conditioner along the cooling pipeline, so that proper air supplement can be carried out on the compressor, and the air conditioner can operate with better refrigerating performance.
The first incidence relation is the incidence relation between the outdoor environment temperature and the heat dissipation temperature difference value obtained through experiments before the air conditioner leaves a factory. In the experiment, the real-time conditions of the temperature of the radiator and the temperature of the refrigerant can be detected when the outdoor environment temperature is at a certain temperature value, and the heat dissipation temperature difference value between the temperature of the radiator and the temperature of the refrigerant is obtained through calculation, so that the one-to-one corresponding relation between the current outdoor environment temperature and the heat dissipation temperature difference value can be established by detecting and summarizing the heat dissipation temperature difference values under the condition of a plurality of outdoor environment temperatures.
In the experiment, the temperature sensor is arranged on the outer surface of the radiator and can be used for detecting the temperature of the outer surface of the radiator, and the temperature of the outer surface of the radiator is taken as the temperature of the radiator in the embodiment. In addition, a temperature sensor is also disposed at the refrigerant inlet end of the heat sink for detecting the temperature of the refrigerant before the refrigerant flows into the heat sink, which is taken as the temperature of the refrigerant for calculating the heat dissipation temperature difference.
S103, determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation between the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow;
in the experiment, when the outdoor environment temperature is at a certain temperature value and the heat dissipation temperature difference value is at a certain temperature difference value, the temperature change condition of the electric control part when different refrigerant quantities are input into the radiator can be determined, and the refrigerant input quantity corresponding to the electric control part of the air conditioner when the optimal cooling effect is achieved can be determined, so that the refrigerant input quantity can be used as the target refrigerant flow, and the one-to-one corresponding relation between the current outdoor environment temperature, the current radiator temperature difference value and the target refrigerant quantity is established.
In the experiment, the electric control part is provided with a temperature sensor which can be used for detecting the temperature change condition of the electric control part, so that the temperature change condition of the electric control part when different refrigerant quantities are input into the radiator is determined by the casing of the temperature sensor under the conditions that the outdoor environment temperature is at a certain temperature value and the heat dissipation temperature difference value is at a certain temperature difference.
In an embodiment, the best cooling effect that the electric control part can achieve is as follows: the input refrigerant quantity can meet the cooling requirement and the refrigerant flow can not be wasted, namely, the input target refrigerant quantity is matched with the refrigerant quantity required by the heat dissipation of the current electric control part.
Therefore, by summarizing the corresponding relations among the plurality of different outdoor environment temperatures, the heat dissipation temperature difference values and the target refrigerant flow rates, the correlation among the outdoor environment temperatures, the heat dissipation temperature difference values and the target refrigerant flow rates can be established, and stored as a built-in program of the air conditioner, so that after the outdoor environment temperatures are obtained through the temperature sensors arranged in the outdoor units, the heat dissipation temperature difference values corresponding to the outdoor environment temperatures can be determined through the first correlation, and the target refrigerant flow rates matched with the current outdoor environment temperatures and the heat dissipation temperature difference values can be determined through the second correlation.
And S104, adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
The control method is suitable for the high-temperature refrigeration working condition, and the optimal cooling effect of the electric control part is realized by controlling the flow of the refrigerant flowing through the radiator. The flow of the refrigerant is adjusted to the target refrigerant flow, so that the problems of overhigh temperature and insufficient heat dissipation of the electric control when the refrigerant flow is too small can be avoided; and the problem that the surface of the electric control is condensed due to the fact that the temperature of the electric control is lower than the dew point temperature of outdoor ambient air when the amount of the refrigerant is too large can be prevented.
In an embodiment, the first correlation related to step S102 is determined according to multiple sets of outdoor ambient temperature, radiator temperature, and refrigerant temperature, and specifically includes:
determining a heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of radiator temperatures and refrigerant temperatures under different outdoor environment temperatures;
in the experiment, multiple sets of outdoor environment temperature values or value ranges to be tested can be determined according to the actual outdoor temperature range of the air conditioner running under the cooling working condition, for example, for users in tropical areas in the south, the variation range of the outdoor environment temperature in summer is approximately 20 ℃ to 55 ℃, so that several outdoor temperature values in the variation range can be used as multiple sets of experimental sample data to be tested, such as 25 ℃, 30 ℃, 35 ℃, 39 ℃, 43 ℃, 53 ℃ and the like, and the radiator temperature and the refrigerant temperature under each set of outdoor environment temperature conditions are respectively detected.
Table 1 shows the measured radiator temperature and refrigerant temperature under different outdoor ambient temperature conditions in one embodiment.
TABLE 1
Therefore, the heat dissipation temperature difference value under each group of outdoor environment temperature conditions can be determined according to the measured refrigerant temperature and the measured radiator temperature, and the corresponding relation between the group of outdoor environment temperatures and the calculated heat dissipation temperature difference value is further determined, and the corresponding relation can be used as a first correlation relation.
According to a plurality of groups of experimental data of different outdoor environment temperatures, a curve graph of the heat dissipation temperature difference value and the outdoor environment temperature can be drawn. Specifically, fig. 2 is a graph of the difference between the heat dissipation temperature and the outdoor ambient temperature in one embodiment. The ordinate is the heat dissipation temperature difference value, and the abscissa is the outdoor environment temperature, so that a variation curve of the heat dissipation temperature difference value along with the outdoor environment temperature can be drawn according to different outdoor environment temperatures and corresponding heat dissipation temperature difference values measured by the experiment.
Thus, according to the drawn change curve, a first fitting equation of the difference value between the outdoor environment temperature and the heat dissipation temperature can be determined; for example, the first fit equation determined from the curve shown in FIG. 2 is:
y=a+b*x,
wherein y is a heat dissipation temperature difference value, x is an outdoor environment temperature, a is a constant term, and b is an outer ring temperature calculation coefficient.
In this way, the first fitted equation may be stored as a first correlation between the outdoor ambient temperature and the difference in heat dissipation temperature in a built-in program of the air conditioner. When the outdoor environment temperature is determined, the heat dissipation temperature difference value between the temperature of the radiator and the temperature of the refrigerant under the current outdoor environment temperature can be calculated according to the first fitting equation.
In an embodiment, the second correlation related to step S103 is determined according to multiple sets of outdoor ambient temperatures, heat dissipation temperature difference values, and refrigerant flow rates, and the specific process includes:
determining the optimal refrigerant flow corresponding to each group of air conditioners at the outdoor environment temperature when the air conditioners at the outdoor environment temperature reach the heat dissipation temperature difference value according to the plurality of groups of outdoor environment temperatures, the heat dissipation temperature difference value and the refrigerant flow; and can draw the curve chart of the outdoor ambient temperature, the heat dissipation temperature difference value and the refrigerant flow according to the data.
For example, FIG. 3 is a graph of the difference in heat dissipation temperature versus the outdoor ambient temperature in one embodiment. The y coordinate is a heat dissipation temperature difference value, the x coordinate is an outdoor environment temperature, and the z coordinate is a refrigerant flow. Therefore, the different outdoor environment temperatures, the corresponding heat dissipation temperature difference values and the refrigerant flow rates measured by the experiment are substituted into the graph, and the graph of the change of the heat dissipation temperature difference values along with the outdoor environment temperature can be drawn.
Combining the heat dissipation temperature difference values with the change curve chart of the graph shown in FIG. 3, and determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference values and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow; and taking the second fitting equation as a second incidence relation.
For example, the second fitted equation determined in an embodiment comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is a refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is an outdoor environment temperature, and y is a heat dissipation temperature difference value.
In an embodiment, adjusting the refrigerant flow rate of the cooling pipeline to the target refrigerant flow rate includes: determining the target opening degree of a flow valve arranged on a cooling pipeline according to the target refrigerant flow; the flow valve is adjusted to a target opening.
The invention also provides an air conditioner, which comprises a temperature sensor and a controller, wherein the temperature sensor is used for: acquiring the outdoor environment temperature of a space where an air conditioner is located; the controller is used for: determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value, wherein the heat dissipation temperature difference value is a difference value between the temperature of a radiator and the temperature of a refrigerant, the temperature of the radiator is the temperature of the radiator used for dissipating heat of an electric control part of the air conditioner, and the temperature of the refrigerant is the temperature of the refrigerant flowing into the radiator; determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow; and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
In an embodiment, the first correlation is determined according to a plurality of sets of outdoor ambient temperature, radiator temperature, and refrigerant temperature, and includes: determining a heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of radiator temperatures and refrigerant temperatures under different outdoor environment temperatures; determining a first fitting equation of the difference value between the outdoor environment temperature and the heat dissipation temperature according to the multiple groups of outdoor environment temperatures and the corresponding heat dissipation temperature difference values; and taking the first fitting equation as the first incidence relation.
In an embodiment, the second correlation is determined according to a plurality of sets of outdoor ambient temperatures, heat dissipation temperature difference values, and refrigerant flow rates, and includes: determining the optimal refrigerant flow corresponding to each group of air conditioners at the outdoor environment temperature when the air conditioners at the outdoor environment temperature reach the heat dissipation temperature difference value according to the plurality of groups of outdoor environment temperatures, the heat dissipation temperature difference value and the refrigerant flow; determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow; and taking the second fitting equation as a second incidence relation.
In an embodiment, the determined second fitting equation comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is a refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is an outdoor environment temperature, and y is a heat dissipation temperature difference value.
In an embodiment, the adjusting the refrigerant flow rate of the cooling pipeline to the target refrigerant flow rate by the controller includes: determining the target opening degree of a flow valve arranged on a cooling pipeline according to the target refrigerant flow; the flow valve is adjusted to a target opening.
The air conditioner structure applied to the control method in the above embodiment is shown in fig. 4, specifically, the air conditioner includes an indoor unit and an outdoor unit, wherein the indoor unit includes a first heat exchanger 1 (i.e. an indoor heat exchanger) for exchanging heat with an indoor environment, the outdoor unit includes a second heat exchanger 2 (i.e. an outdoor heat exchanger) for exchanging heat with the outdoor environment, and a compressor 3 for providing circulating power for a refrigerant, and electrical components such as a computer board and a single chip microcomputer are disposed in the outdoor unit, and the first heat exchanger 1, the second heat exchanger 2, and the compressor 3 are communicated with a first pipeline 4 and a second pipeline 5 to form a conventional refrigerant circulation loop, in the embodiment, when the air conditioning system operates in a cooling mode in summer, a refrigerant exchanging heat with the outdoor environment flows out of the second heat exchanger 2, flows into the first heat exchanger 1 through the first pipeline 4, and at the same time, a refrigerant exchanging heat with the indoor environment flows, flows into the second heat exchanger 2 through the second pipeline 5, and can realize the refrigeration and cooling functions of the air conditioning system to the indoor environment through the refrigerant circulation process. Similarly, when the heating mode is operated in winter, the refrigerant flows between the first heat exchanger 1 and the second heat exchanger 2 in the direction opposite to the cooling mode. The heating and warming functions of the air conditioning system to the indoor environment can be realized.
Besides the conventional refrigerant circulation loop, the air conditioning system also comprises a cooling pipe group for solving the problem of overhigh temperature when an electric control component works.
Specifically, the cooling tube group mainly includes two parts of a cooling assembly and a cooling pipeline 9, wherein the cooling assembly mainly includes:
the flash evaporator 6 is connected to the first pipeline 4, can evaporate part of liquid refrigerants flowing through the first pipeline 4 into gaseous refrigerants and conveys the gaseous refrigerants to the cooling pipeline 9, so that the gaseous refrigerants are used as heat exchange media in the subsequent cooling process of the cooling pipeline 9;
the first throttling device 801 is arranged on the first pipeline 4 and is used for adjusting the flow of the gaseous refrigerant in the cooling pipeline 9, the pressure, the temperature and the like of the refrigerant subjected to heat exchange by the electric control part, so that the refrigerant flowing into the compressor 3 can meet the requirement of the compressor 3 for air supplement and enthalpy increase; therefore, the flow valve adjusted by the control method in the foregoing embodiment is the first throttling device 801;
radiator 7, radiator 7 connect on cooling line 9 and adjacent electric control spare set up, because electric control spare sets up in semi-closed container such as automatically controlled box mostly, consequently radiator 7 can be as gaseous refrigerant and the heat transfer carrier of electric control spare surrounding air, through cooling to electric control component's surrounding air, and then can be with the temperature control of electric control spare self below safe operating temperature. The specific structure and type of the radiator 7 can be determined according to the structure of the outdoor unit, and in the embodiment, the type of the radiator 7 arranged on the cooling pipeline 9 is a advection heat exchanger, and the advection heat exchanger has the advantages of high heat exchange rate, small occupied space and the like, and is suitable for the structure of the air-conditioning outdoor unit with a compact structure.
The flow sequence of the refrigerant used for dissipating heat and reducing temperature of the electric control part in the cooling pipe group is as follows: the first pipeline 4 → the flash tank 6 → the radiator 7 → the gas-liquid separator 10 → the compressor 3, and the first throttle device 801 may be provided on the cooling pipeline 9 between the flash tank 6 and the compressor 3 as needed.
In the air-supplying enthalpy-increasing structure of the conventional air-conditioning system, the refrigerant in the refrigerant pipeline is mostly directly conveyed to the compressor 3, in the process, parameters such as the temperature, the pressure and the like of the refrigerant do not change greatly, in the air conditioning system of the present invention, the temperature and pressure of the gaseous refrigerant flowing through the heat sink 7 are increased, thereby reducing the subsequent compression efficiency of the refrigerant by the compressor 3, in one embodiment of the present invention, the air conditioning system further comprises a second throttling device 802 and a third throttling device 803, wherein, the second throttling set 802 is arranged on the first pipeline 4 between the second heat exchanger 2 and the flash evaporator 6, and the third throttling set 803 is arranged on the first pipeline 4 between the first heat exchanger 1 and the flash evaporator 6, compared with the conventional air-conditioning structure for supplementing air and increasing enthalpy, the air-conditioning system has the advantages that the second throttling set 802 and the third throttling set 803 are arranged: taking the air-conditioning operation cooling mode as an example, before the liquid refrigerant flows into the flash evaporator 6 from the second heat exchanger 2 of the outdoor unit, the second throttling device 802 arranged between the second heat exchanger 2 and the flash evaporator 6 can throttle the refrigerant in one step to reduce the pressure of the refrigerant, so that the flash evaporator 6 can evaporate the liquid refrigerant into a gaseous refrigerant, and meanwhile, the temperature of the refrigerant is lower, so that the heat exchange amount of the refrigerant at the heat radiator 7 can be increased.
Because part of the liquid refrigerant flows into the cooling pipeline 9 in the form of gaseous refrigerant in the flash evaporator 6, in order to ensure that the temperature and the pressure of the refrigerant flowing into the first heat exchanger 1 of the indoor unit meet the actual indoor heat exchange requirements, the third throttling device 803 arranged between the first heat exchanger 1 and the flash evaporator 6 can play a role of a throttling expansion valve, and is used for adjusting the parameters of the temperature, the pressure and the like of the refrigerant flowing out of the flash evaporator 6.
The above embodiment is taken as an example of the air conditioner operating in the cooling mode under the high temperature working condition in summer, and similarly, under the low temperature working condition in winter, the outdoor low temperature condition may affect the heat exchange amount between the outdoor unit and the outdoor environment, and in order to ensure the heating capacity of the air conditioning system operating in the heating mode, the air supplying and enthalpy increasing operation needs to be performed on the compressor 3, when the air conditioner operates in a heating mode, the flow direction of the refrigerant in the air conditioner pipeline is opposite to that of the cooling mode, at the moment, the third throttling device 803 arranged between the first heat exchanger 1 and the flash tank 6 can play a throttling role of the second throttling device 802 under the cooling working condition, parameters such as the temperature, the pressure and the like of the refrigerant flowing into the flash tank 6 are firstly regulated in one step, the second throttling means 802 functions as a stop expansion valve for adjusting parameters such as temperature and pressure of the refrigerant flowing out of the flash tank 6 and flowing into the second heat exchanger 2 of the outdoor unit. In order to realize the refrigerant adjusting process under the two working conditions, the second throttling device 802 and the third throttling device 803 adopted by the invention are bidirectional throttling devices.
The outdoor unit of the air conditioning system further comprises a gas-liquid separator 10 used for storing and conveying a refrigerant to the compressor 3, and the compressor 3 at least comprises a first-stage compression part and a second-stage compression part, wherein the first-stage compression part is used for performing first-stage compression on the refrigerant flowing into the gas-liquid separator 10, and the second-stage compression part is used for performing second-stage compression on the refrigerant, so that the refrigerant output by the compressor 3 can meet the temperature and pressure required by the second heat exchanger 2 of the outdoor unit for external heat exchange.
In one embodiment of the present invention, the flash evaporator 6 is connected in series with the first pipeline 4, and the main structure of the flash evaporator 6 includes a liquid refrigerant portion and a gaseous refrigerant portion communicated with the liquid refrigerant portion, wherein the liquid refrigerant portion has a liquid inlet and a liquid outlet connected in series with the first pipeline 4, and a first gas outlet for the gaseous refrigerant to flow to the gaseous refrigerant portion, and the gaseous refrigerant portion also has a second gas outlet communicated with the cooling pipeline 9.
Accordingly, the radiator 7 has an inlet end communicating with the second outlet of the gaseous refrigerant portion and an outlet end communicating with the inlet of the gas-liquid separator 10.
In another embodiment of the present invention, the flash tank 6 is connected in parallel with the first pipeline 4, a stop valve is disposed on a parallel pipeline section of the first pipeline 4 corresponding to the flash tank 6, and the opening or closing of the first throttling device 801 and the stop valve can be controlled to conduct or block a refrigerant pipeline where the flash tank 6 is located and the corresponding parallel pipeline section, for example, the stop valve of the parallel pipeline section can be opened and the first throttling device 801 can be closed to prevent refrigerant from flowing through the cooling pipeline 9, which is suitable for a situation where the electric control part has a small heat generation amount and the temperature is kept below the safe working temperature, and is also suitable for a working condition where the compressor 3 does not need to supplement air and increase enthalpy.
Meanwhile, for the parallel connection form of the flash evaporator 6, the refrigerant quantity flowing into the indoor unit first heat exchanger 1 and the refrigerant quantity for heat dissipation of the electric control or air supply and enthalpy increase of the compressor 3 can be adjusted by controlling the flow opening of the first throttling device 801 and the stop valve, so that the whole air conditioning system is maintained in the optimal working state.
Optionally, the first throttling device 801 in the cooling assembly is disposed on the cooling pipeline 9 between the heat sink 7 and the compressor 3, so as to adjust the flow rate and flow rate of the refrigerant in the cooling pipeline 9, and also play a role of an expansion valve, so as to perform secondary throttling on the gaseous refrigerant, so as to reduce the temperature and pressure of the refrigerant, and thus improve the compression efficiency of the compressor 3 on the mixed refrigerant.
In an embodiment of the present invention, the air conditioning system is provided with a first sensor for detecting an indoor temperature, and the opening degrees of the first throttling device 801 and the second throttling device 802 can be adjusted according to the detected indoor temperature, so as to meet the refrigerant quantity requirement for heat exchange of an indoor environment.
As shown in fig. 5 and 6, taking the cooling mode as an example, the change process of the enthalpy value and the entropy value of the refrigerant in the circulating flow process of the air conditioning system is as follows: the refrigerant at the state point K in the gas-liquid separator flows into the compressor 3 from the suction port, is isentropically compressed into the refrigerant at the state point D through the primary compression part and the secondary compression part, and is discharged from the exhaust port of the compressor; the compressor 3 inputs the refrigerant at the state point D into the second heat exchanger 2, and the refrigerant is cooled to a liquid point E by the outdoor environment; the refrigerant enters the first pipeline 4 along the outlet of the second heat exchanger 2, is subjected to isenthalpic throttling to a state point F through a second throttling device 802, and then flows into the flash tank 6; the refrigerant flowing out of a liquid outlet of a liquid refrigerant part of the flash evaporator 6 is at a state point G, is throttled to a state point I by a third flow device, enters the first heat exchanger 1 to absorb heat and evaporate, then is changed into a state point J, is discharged from an outlet of the first heat exchanger, and then returns to the gas-liquid separator 10 through a second pipeline 5, and at the moment, the refrigerant is at a state point A; meanwhile, the gaseous refrigerant flowing out of the second gas outlet of the gaseous refrigerant part of the flash evaporator 6 is at a state point H, and after passing through the parallel flow heat exchanger and exchanging heat with the electric control part, the gaseous refrigerant becomes a state point C, and then the gaseous refrigerant is subjected to pressure reduction and temperature reduction by the first throttling device 801 to become a state point B, and is mixed with the refrigerant flowing along the second pipeline 5 to form the refrigerant at the state point K, and the refrigerant flows into the gas-liquid separator 10.
In the refrigerant cycle of the present invention, in order to reduce the mutual interference effect between the two processes of temperature reduction of the electric control component and gas and enthalpy increase of the compressor 3, the two processes can be implemented by controlling the flow opening degrees of the first throttling device 801, the second throttling device 802 and the third throttling device 803, for example, in the illustrated embodiment, after the refrigerant flowing out of the second heat exchanger 2 of the outdoor unit is throttled by the second throttling device 802, the refrigerant changes from the state point E to the state point F, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, and the temperature is reduced; the refrigerant flowing through the first throttling device 801 is changed from the state point C to the state point B, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, the temperature is reduced, and the efficiency of the compressor 3 for performing secondary compression on the mixed refrigerant is improved; the refrigerant flowing from the flash tank 6 to the third throttling device 803 is changed from the state point G to the state point I, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, and the temperature is reduced, so that the refrigeration and heat exchange between the refrigerant and the indoor environment after the refrigerant enters the first heat exchanger 1 of the indoor unit are improved.
In an embodiment of the present invention, the air conditioner is provided with a plurality of sensors, including the first sensor for detecting the outdoor temperature, the second sensor for detecting the indoor temperature, the third sensor for detecting the radiator temperature and the fourth sensor for detecting the exhaust temperature in the foregoing control method embodiments, and the first throttling device 801, the second throttling device 802 and the third throttling device 803 may be adjusted according to the detected relevant temperature parameters, so that the air conditioner may increase or decrease the refrigerant flow rate for dissipating heat from the electric control unit and supplementing the compressor without affecting the indoor heat exchange efficiency.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. A method of controlling an air conditioner, comprising:
acquiring the outdoor environment temperature of the space where the air conditioner is located;
determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between the preset outdoor environment temperature and the heat dissipation temperature difference value; the heat dissipation temperature difference value is the difference value between the temperature of a heat radiator and the temperature of a refrigerant, the temperature of the heat radiator is the temperature of the heat radiator used for dissipating heat of an electric control part of the air conditioner, and the temperature of the refrigerant is the temperature of the refrigerant flowing into the heat radiator;
determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow;
and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
2. The control method according to claim 1, wherein the first correlation is determined according to a plurality of sets of outdoor ambient temperature, radiator temperature and refrigerant temperature, and includes:
determining the heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of the radiator temperature and the refrigerant temperature under different outdoor environment temperatures;
determining a first fitting equation of the outdoor environment temperature and the heat dissipation temperature difference value according to the multiple groups of outdoor environment temperatures and the heat dissipation temperature difference values corresponding to the outdoor environment temperatures;
and taking the first fitted equation as the first incidence relation.
3. The control method of claim 2, wherein the second correlation is determined according to the plurality of sets of outdoor ambient temperatures, the heat dissipation temperature difference values, and the refrigerant flow rate, and comprises:
determining the optimal refrigerant flow corresponding to each group of the air conditioners at the outdoor environment temperature when the air conditioners reach the heat dissipation temperature difference value according to the plurality of groups of the outdoor environment temperatures, the heat dissipation temperature difference values and the refrigerant flow;
determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow;
and taking the second fitted equation as the second incidence relation.
4. The control method of claim 3, wherein the determined second fit equation comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is the refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is the outdoor environment temperature, and y is the heat dissipation temperature difference.
5. The method of claim 1, wherein adjusting the refrigerant flow rate of the cooling line to the target refrigerant flow rate comprises:
determining a target opening degree of a flow valve arranged on the cooling pipeline according to the target refrigerant flow;
and adjusting the flow valve to the target opening.
6. An air conditioner is characterized by comprising an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electric control part and a radiator for radiating the electric control part, wherein the radiator is arranged on a cooling pipeline, the inlet end of the cooling pipeline is connected with a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger, and the outlet end of the cooling pipeline is connected with an air supplement port of the compressor of the air conditioner; the air conditioner further includes a temperature sensor and a controller, wherein,
the temperature sensor is used for: acquiring the outdoor environment temperature of the space where the air conditioner is located;
the controller is configured to:
determining a heat dissipation temperature difference value corresponding to the outdoor environment temperature according to a first correlation relation between a preset outdoor environment temperature and the heat dissipation temperature difference value, wherein the heat dissipation temperature difference value is a difference value between a radiator temperature and a refrigerant temperature, the radiator temperature is the radiator temperature of a radiator for radiating heat of an electric control part of the air conditioner, and the refrigerant temperature is the temperature of a refrigerant flowing into the radiator;
determining the target refrigerant flow of the cooling pipeline according to a preset second correlation relation among the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow;
and adjusting the refrigerant flow of the cooling pipeline to the target refrigerant flow.
7. The air conditioner of claim 6, wherein the first correlation is determined according to a plurality of sets of outdoor ambient temperature, radiator temperature and refrigerant temperature, including:
determining the heat dissipation temperature difference value corresponding to each group of outdoor environment temperature according to a plurality of groups of experimental data of different outdoor environment temperatures; the experimental data comprise a plurality of groups of the radiator temperature and the refrigerant temperature under different outdoor environment temperatures;
determining a first fitting equation of the outdoor environment temperature and the heat dissipation temperature difference value according to the multiple groups of outdoor environment temperatures and the heat dissipation temperature difference values corresponding to the outdoor environment temperatures;
and taking the first fitted equation as the first incidence relation.
8. The air conditioner of claim 7, wherein the second correlation is determined according to the sets of outdoor ambient temperatures, the heat dissipation temperature difference values, and the refrigerant flow rates, and comprises:
determining the optimal refrigerant flow corresponding to each group of the air conditioners at the outdoor environment temperature when the air conditioners reach the heat dissipation temperature difference value according to the plurality of groups of the outdoor environment temperatures, the heat dissipation temperature difference values and the refrigerant flow;
determining a second fitting equation of the outdoor environment temperature, the heat dissipation temperature difference value and the refrigerant flow according to the heat dissipation temperature difference values of the multiple groups of outdoor environment temperatures and the optimal refrigerant flow;
and taking the second fitted equation as the second incidence relation.
9. The air conditioner of claim 8, wherein the determined second fit equation comprises:
z=p1+p2*x+p3*x2+p4*Ln(y)+p5*(Ln(y))2
wherein z is the refrigerant flow rate, p1 is a calculation constant, p2 is a second calculation coefficient, p3 is a third calculation coefficient, p4 is a fourth calculation coefficient, p5 is a fifth calculation coefficient, x is the outdoor environment temperature, and y is the heat dissipation temperature difference.
10. The air conditioner of claim 9, wherein the controller adjusts the refrigerant flow rate of the cooling pipeline to the target refrigerant flow rate, and comprises:
determining a target opening degree of a flow valve arranged on the cooling pipeline according to the target refrigerant flow;
and adjusting the flow valve to the target opening.
CN201710434349.XA 2017-06-09 2017-06-09 Air conditioner and control method Active CN107228455B (en)

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CN108561980B (en) * 2018-03-30 2021-01-29 青岛海尔空调器有限总公司 Control method and device of air conditioning system
CN108548242B (en) * 2018-03-30 2021-01-29 青岛海尔空调器有限总公司 Control method and device of air conditioning system
CN108548252B (en) * 2018-03-30 2021-01-29 青岛海尔空调器有限总公司 Control method and device of air conditioning system
CN108548294B (en) * 2018-03-30 2021-01-29 青岛海尔空调器有限总公司 Control method and device of air conditioning system
CN110887170A (en) * 2018-09-10 2020-03-17 青岛海尔空调电子有限公司 Pipeline corresponding method and device for multi-split air conditioner and air conditioner
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