CN106931547B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN106931547B CN106931547B CN201710198251.9A CN201710198251A CN106931547B CN 106931547 B CN106931547 B CN 106931547B CN 201710198251 A CN201710198251 A CN 201710198251A CN 106931547 B CN106931547 B CN 106931547B
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system and a control method of the air conditioning system. The air conditioning system includes: a plurality of outdoor units; the indoor units are respectively connected with the outdoor units through liquid pipes, low-pressure air pipes and high-pressure air pipes; one end of the valve body is connected with the liquid pipe, and the other end of the valve body is connected with the low-pressure air pipe through a plurality of supercooling pipes; and the controller is used for adjusting the opening of the valve body according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit. The air conditioning system can ensure the refrigerating effect of the refrigerating inner machine and improve the reliability of the refrigerating system.
Description
Technical Field
The invention relates to the technical field of air conditioner manufacturing, in particular to an air conditioning system and a control method of the air conditioning system.
Background
The three-pipe heating recovery multi-split air conditioning system can perform cooling operation on part of the indoor units and perform heating operation on part of the indoor units simultaneously. When the connection positions of the refrigerating and heating indoor units on the pipeline are close, the refrigerating indoor unit is usually affected by the heating indoor unit to reduce the refrigerating effect. Therefore, how to improve the cooling effect of the cooling indoor unit and improve the reliability of the operation of the air conditioning system is very important.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
To this end, an object of the present invention is to propose an air conditioning system. The air conditioning system can ensure the refrigerating effect of the refrigerating inner machine and improve the reliability of the refrigerating system.
Another object of the present invention is to provide a control method of an air conditioning system.
In order to achieve the above object, an embodiment of a first aspect of the present invention discloses an air conditioning system including: a plurality of outdoor units; the indoor units are respectively connected with the outdoor units through liquid pipes, low-pressure air pipes and high-pressure air pipes; one end of the valve body is connected with the liquid pipe, and the other end of the valve body is connected with the low-pressure air pipe through a plurality of supercooling pipes; and the controller is used for adjusting the opening of the valve body according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit.
The air conditioning system provided by the embodiment of the invention can effectively control the supercooling degree within a reasonable range by accurately controlling the opening of the valve body in a pure refrigeration mode and a mixed mode, thereby ensuring the refrigeration effect of the refrigeration indoor unit. In addition, when the outdoor unit has insufficient exhaust superheat, the exhaust superheat can be stabilized in a certain proper range by accurately controlling the opening of the valve body, so that the reliability of the refrigeration system is improved.
In some examples, the controller is configured to determine whether the outlet temperatures of the plurality of supercooling pipes are less than an average evaporator temperature of the indoor unit, and further determine whether the degree of superheat of the exhaust gas of the outdoor unit is less than a first predetermined temperature when the outlet temperatures of the plurality of supercooling pipes are less than the average evaporator temperature of the indoor unit, and control the valve body to close by a first predetermined opening degree when the degree of superheat of the exhaust gas of the outdoor unit is less than the first predetermined temperature.
In some examples, the controller is further configured to, when the discharge superheat of the outdoor unit is greater than or equal to a first predetermined temperature, further determine whether the discharge superheat of the outdoor unit is greater than a second predetermined temperature and whether the opening of the valve body is smaller than a second predetermined opening, and control the valve body to open by a third predetermined opening when the discharge superheat of the outdoor unit is greater than the second predetermined temperature and the opening of the valve body is smaller than the second predetermined opening, wherein the second predetermined temperature is greater than the first predetermined temperature.
In some examples, the controller is further configured to further determine whether a temperature difference between the outlet temperature and the inlet temperature of the plurality of subcooling pipes is less than a third predetermined temperature when the outlet temperature of the plurality of subcooling pipes is greater than or equal to an average temperature of an evaporator of the indoor unit, and control the valve body to close by the first predetermined opening degree when the temperature difference is less than the third predetermined temperature.
In some examples, the controller is further configured to determine whether the temperature difference is greater than or equal to a fourth predetermined temperature when the temperature difference is greater than or equal to the third predetermined temperature, and control the valve body to open by a third predetermined opening degree when the temperature difference is greater than or equal to the fourth predetermined temperature, wherein the fourth predetermined temperature is greater than the third predetermined temperature.
An embodiment of a second aspect of the present invention discloses a control method of an air conditioning system, the air conditioning system including: a plurality of outdoor units; the indoor units are respectively connected with the outdoor units through liquid pipes, low-pressure air pipes and high-pressure air pipes; the valve body, one end of the valve body with the liquid pipe links to each other and the other end passes through a plurality of subcooling pipes with the low-pressure trachea links to each other, the method includes: and adjusting the opening degree of the valve body according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit.
The control method of the air conditioning system provided by the embodiment of the invention can effectively control the supercooling degree within a reasonable range by accurately controlling the opening of the valve body in a pure cooling mode and a mixed mode, thereby ensuring the cooling effect of the refrigerating indoor unit. In addition, when the outdoor unit has insufficient exhaust superheat, the exhaust superheat can be stabilized in a certain proper range by accurately controlling the opening of the valve body, so that the reliability of the refrigeration system is improved.
In some examples, the adjusting of the opening degree of the valve body according to the inlet and outlet temperatures of the plurality of supercooling pipes, the discharge superheat degree of the outdoor unit, and the average temperature of the evaporator of the indoor unit includes: judging whether the outlet temperatures of the multiple supercooling pipes are lower than the average temperature of the evaporator of the indoor unit; if yes, further judging whether the discharge superheat degree of the outdoor unit is less than a first preset temperature; and if the discharge superheat degree of the outdoor unit is less than a first preset temperature, controlling the valve body to close by a first preset opening degree.
In some examples, further comprising: when the discharge superheat degree of the outdoor unit is greater than or equal to a first preset temperature, further judging whether the discharge superheat degree of the outdoor unit is greater than a second preset temperature and whether the opening of the valve body is smaller than a second preset opening; and if so, controlling the valve body to open by a third preset opening degree, wherein the second preset temperature is higher than the first preset temperature.
In some examples, further comprising: when the outlet temperatures of the multiple supercooling pipes are greater than or equal to the average temperature of the evaporator of the indoor unit, further judging whether the temperature difference between the outlet temperatures and the inlet temperatures of the multiple supercooling pipes is less than a third preset temperature; and if so, controlling the valve body to close the first preset opening.
In some examples, further comprising: when the temperature difference is greater than or equal to a third preset temperature, further judging whether the temperature difference is greater than or equal to a fourth preset temperature; and if the temperature difference is greater than or equal to a fourth preset temperature, controlling the valve body to be opened by a third preset opening degree, wherein the fourth preset temperature is greater than the third preset temperature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment of the present invention;
FIG. 2 is a partial schematic view of an air conditioning system according to one embodiment of the present invention;
fig. 3 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention.
Description of reference numerals:
the air conditioning system comprises an air conditioning system 100, a plurality of outdoor units 110, a plurality of indoor units 120, a compressor 1, a low-pressure tank 2, a four-way valve 3, a four-way valve 4, a four-way valve 5, a left heat exchanger 6, a right heat exchanger 7, an electronic expansion valve 8, a liquid pipe 9, a low-pressure air pipe 10, a high-pressure air pipe 11, a supercooling electronic expansion valve 12, a pressure relief electromagnetic valve 13, a refrigeration electromagnetic valve 14, a heating electromagnetic valve 15, a high-pressure sensor 16, a low-pressure sensor 17.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
An air conditioning system and a control method of the air conditioning system according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of an air conditioning system according to an embodiment of the present invention, and fig. 2 is a partial schematic view of an air conditioning system according to an embodiment of the present invention. As shown in fig. 1 in conjunction with fig. 2, an air conditioning system 100 according to an embodiment of the present invention includes: a plurality of outdoor units 110, a plurality of indoor units 120, a valve body 12 (e.g., a sub-cooling electronic expansion valve), and a controller (not shown in fig. 1).
The indoor units 120 are connected to the outdoor units 110 through liquid pipes 9 (liquid pipes 9), low pressure air pipes 10, and high pressure air pipes 11, respectively. One end of the valve body 12 is connected to the liquid pipe 9 and the other end is connected to the low pressure gas pipe 10 through a plurality of supercooling pipes 18. The controller is used for adjusting the opening degree of the valve body 12 according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes 18, the exhaust superheat degree of the outdoor unit and the average evaporator temperature of the indoor unit.
As shown in fig. 1, the outdoor unit 110 includes a compressor 1, a low pressure liquid storage tank 2 (i.e., a low pressure tank 2), a four-way valve 3 (i.e., ST1), a four-way valve 4 (i.e., ST2), a four-way valve 5 (i.e., ST3), a left heat exchanger 6, a right heat exchanger 7, an electronic expansion valve 8, etc., and the low pressure gas pipe 10, the high pressure gas pipe 11, and the liquid pipe 9 may be integrated with the outdoor unit 110, a first valve body 13 may be connected between the low pressure gas pipe 10 and the high pressure gas pipe 11, and one end of the first valve body 13 may be connected to the.
The operation of the air conditioning system according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 3.
As shown in fig. 3, the controller is configured to determine whether the outlet temperature Tc of the plurality of subcooling pipes 18 is lower than the average evaporator temperature T2B of the indoor unit, further determine whether the discharge superheat Tsh of the outdoor unit is lower than a first predetermined temperature C when the outlet temperature Tc of the plurality of subcooling pipes 18 is lower than the average evaporator temperature T2B of the indoor unit, and control the valve body 12 to close by a first predetermined opening a when the discharge superheat Tsh of the outdoor unit is lower than the first predetermined temperature C.
Referring to fig. 3 again, the controller is further configured to further determine whether the discharge superheat Tsh of the outdoor unit is greater than a second predetermined temperature D and whether the opening degree (i.e., EXV opening degree) of the valve body 12 is smaller than a second predetermined opening degree C when the discharge superheat Tsh of the outdoor unit is greater than or equal to the first predetermined temperature C, and control the valve body 12 to open by a third predetermined opening degree b when the discharge superheat Tsh of the outdoor unit is greater than the second predetermined temperature D and the opening degree of the valve body 12 is smaller than the second predetermined opening degree C, wherein the second predetermined temperature D is greater than the first predetermined temperature C. Further, the controller is further configured to further determine whether a temperature difference between the outlet temperature Tc and the inlet temperature Tj of the plurality of subcooling pipes 18 is less than a third predetermined temperature d when the outlet temperature Tc of the plurality of subcooling pipes 18 is greater than or equal to the average evaporator temperature T2B of the indoor unit, and control the valve body 12 to close by the first predetermined opening a when the temperature difference is less than the third predetermined temperature d.
Referring to fig. 3 again, the controller is further configured to further determine whether the temperature difference is greater than or equal to a fourth predetermined temperature e when the temperature difference is greater than or equal to the third predetermined temperature d, and control the valve body 12 to open by a third predetermined opening degree b when the temperature difference is greater than or equal to the fourth predetermined temperature e, where the fourth predetermined temperature e is greater than the third predetermined temperature d.
The first predetermined opening degree a and the third predetermined opening degree b are the number of steps of each adjustment of the electronic expansion valve, and may be generally set to 8-32 steps, the first predetermined temperature C is, for example, 8-12 ℃, the second predetermined temperature D is, for example, 10-20 ℃, the second predetermined opening degree C is a relatively small fixed opening degree, and may be, but is not limited to, 48 steps, 72 steps, 96 steps, and the like, the third predetermined temperature D is, for example, 1-3 ℃, and the fourth predetermined temperature e is, for example, 4-8 ℃.
It should be noted that, in the above description, the minimum opening degree of the valve body 12 is limited to f, further, when the opening degree of the valve body 12 is f and n minutes are continuously satisfied, and if the opening degree of the valve body 12 needs to be reduced, the valve body 12 is forcibly opened to 0P, and is opened to the initial opening degree Po after m minutes. Where f is a relatively small fixed opening, which may be, but not limited to, 48 steps, 72 steps, 96 steps, etc., n is, for example, about 2 to 5 minutes, and m is, for example, about 5 to 10 minutes.
The air conditioning system provided by the embodiment of the invention can effectively control the supercooling degree within a reasonable range by accurately controlling the opening of the valve body in a pure refrigeration mode and a mixed mode, thereby ensuring the refrigeration effect of the refrigeration indoor unit. In addition, when the outdoor unit has insufficient exhaust superheat, the exhaust superheat can be stabilized in a certain proper range by accurately controlling the opening of the valve body, so that the reliability of the refrigeration system is improved.
Wherein, the pure refrigeration mode refers to an indoor unit only having refrigeration. The hybrid mode refers to the presence of both a cooling indoor unit and a heating indoor unit.
It should be noted that other functions and functions of the air conditioning system according to the embodiment of the present invention are known to those skilled in the art, and are not described herein.
Fig. 3 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention. As shown in fig. 3, a control method of an air conditioning system according to an embodiment of the present invention includes: and adjusting the opening degree of the valve body according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit.
Specifically, the step of adjusting the opening degree of the valve body according to the inlet and outlet temperatures of the plurality of supercooling pipes, the discharge superheat degree of the outdoor unit, and the average temperature of the evaporator of the indoor unit includes: judging whether the outlet temperatures of the multiple supercooling pipes are lower than the average temperature of the evaporator of the indoor unit; if yes, further judging whether the discharge superheat degree of the outdoor unit is less than a first preset temperature; and if the discharge superheat degree of the outdoor unit is less than a first preset temperature, controlling the valve body to close by a first preset opening degree.
Further, still include: when the discharge superheat degree of the outdoor unit is greater than or equal to a first preset temperature, further judging whether the discharge superheat degree of the outdoor unit is greater than a second preset temperature and whether the opening of the valve body is smaller than a second preset opening; and if so, controlling the valve body to open by a third preset opening degree, wherein the second preset temperature is higher than the first preset temperature.
In one embodiment of the present invention, further comprising: when the outlet temperatures of the multiple supercooling pipes are greater than or equal to the average temperature of the evaporator of the indoor unit, further judging whether the temperature difference between the outlet temperatures and the inlet temperatures of the multiple supercooling pipes is less than a third preset temperature; and if so, controlling the valve body to close the first preset opening.
Further, still include: when the temperature difference is greater than or equal to a third preset temperature, further judging whether the temperature difference is greater than or equal to a fourth preset temperature; and if the temperature difference is greater than or equal to a fourth preset temperature, controlling the valve body to be opened by a third preset opening degree, wherein the fourth preset temperature is greater than the third preset temperature.
The control method of the air conditioning system provided by the embodiment of the invention can effectively control the supercooling degree within a reasonable range by accurately controlling the opening of the valve body in a pure cooling mode and a mixed mode, thereby ensuring the cooling effect of the refrigerating indoor unit. In addition, when the outdoor unit has insufficient exhaust superheat, the exhaust superheat can be stabilized in a certain proper range by accurately controlling the opening of the valve body, so that the reliability of the refrigeration system is improved.
According to the control method of the air conditioning system, the first valve body and the second valve body are controlled to be opened and closed, so that high-temperature and high-pressure refrigerants can be guided to the low-pressure tank and the heat exchanger of the outdoor unit, the low-pressure is increased, power is provided to promote the refrigerants in the low-pressure tank and the heat exchanger of the outdoor unit to flow rapidly, the evaporation pressure is increased, and the refrigerant circulation is accelerated.
It should be noted that a specific implementation manner of the control method of the air conditioning system according to the embodiment of the present invention is similar to that of the air conditioning system according to the embodiment of the present invention, and please refer to the description of the system part specifically, and no further description is given for reducing redundancy.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any of several embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. An air conditioning system, comprising:
a plurality of outdoor units;
the indoor units are respectively connected with the outdoor units through liquid pipes, low-pressure air pipes and high-pressure air pipes;
one end of the valve body is connected with the liquid pipe, and the other end of the valve body is connected with the low-pressure air pipe through a plurality of supercooling pipes;
and the controller is used for adjusting the opening of the valve body according to the inlet temperatures and the outlet temperatures of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit, further judging whether the exhaust superheat degree of the outdoor unit is less than a first preset temperature or not when the outlet temperatures of the plurality of supercooling pipes are less than the average temperature of the evaporator of the indoor unit, and controlling the valve body to close the first preset opening when the exhaust superheat degree of the outdoor unit is less than the first preset temperature.
2. The air conditioning system of claim 1, wherein the controller is further configured to determine whether the discharge superheat of the outdoor unit is greater than a second predetermined temperature and the opening of the valve is smaller than the second predetermined opening when the discharge superheat of the outdoor unit is greater than or equal to a first predetermined temperature, and to control the valve to open by a third predetermined opening when the discharge superheat of the outdoor unit is greater than the second predetermined temperature and the opening of the valve is smaller than the second predetermined opening, wherein the second predetermined temperature is greater than the first predetermined temperature.
3. The air conditioning system of claim 1, wherein the controller is further configured to further determine whether a temperature difference between the outlet temperature and the inlet temperature of the plurality of supercooling pipes is less than a third predetermined temperature when the outlet temperature of the plurality of supercooling pipes is greater than or equal to the average temperature of the evaporator of the indoor unit, and control the valve body to close by the first predetermined opening degree when the temperature difference is less than the third predetermined temperature.
4. The air conditioning system of claim 3, wherein the controller is further configured to determine whether the temperature difference is greater than or equal to a fourth predetermined temperature when the temperature difference is greater than or equal to a third predetermined temperature, and control the valve to open by a third predetermined opening degree when the temperature difference is greater than or equal to the fourth predetermined temperature,
wherein the fourth predetermined temperature is greater than the third predetermined temperature.
5. A control method of an air conditioning system, characterized in that the air conditioning system comprises: a plurality of outdoor units; the indoor units are respectively connected with the outdoor units through liquid pipes, low-pressure air pipes and high-pressure air pipes; the valve body, one end of the valve body with the liquid pipe links to each other and the other end passes through a plurality of subcooling pipes with the low-pressure trachea links to each other, the method includes:
adjusting the opening degree of the valve body according to the inlet temperature and the outlet temperature of the plurality of supercooling pipes, the exhaust superheat degree of the outdoor unit and the average temperature of the evaporator of the indoor unit, wherein whether the outlet temperatures of the plurality of supercooling pipes are lower than the average temperature of the evaporator of the indoor unit is judged; if yes, further judging whether the discharge superheat degree of the outdoor unit is less than a first preset temperature; and if the discharge superheat degree of the outdoor unit is less than a first preset temperature, controlling the valve body to close by a first preset opening degree.
6. The control method of an air conditioning system according to claim 5, characterized by further comprising:
when the discharge superheat degree of the outdoor unit is greater than or equal to a first preset temperature, further judging whether the discharge superheat degree of the outdoor unit is greater than a second preset temperature and whether the opening of the valve body is smaller than a second preset opening;
and if so, controlling the valve body to open by a third preset opening degree, wherein the second preset temperature is higher than the first preset temperature.
7. The control method of an air conditioning system according to claim 5, characterized by further comprising:
when the outlet temperatures of the multiple supercooling pipes are greater than or equal to the average temperature of the evaporator of the indoor unit, further judging whether the temperature difference between the outlet temperatures and the inlet temperatures of the multiple supercooling pipes is less than a third preset temperature;
and if so, controlling the valve body to close the first preset opening.
8. The control method of an air conditioning system according to claim 7, further comprising:
when the temperature difference is greater than or equal to a third preset temperature, further judging whether the temperature difference is greater than or equal to a fourth preset temperature;
if the temperature difference is greater than or equal to a fourth preset temperature, controlling the valve body to be opened by a third preset opening degree,
wherein the fourth predetermined temperature is greater than the third predetermined temperature.
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| CN201710198251.9A CN106931547B (en) | 2017-03-29 | 2017-03-29 | Air conditioning system and control method thereof |
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| CN201710198251.9A CN106931547B (en) | 2017-03-29 | 2017-03-29 | Air conditioning system and control method thereof |
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| CN108036551A (en) * | 2017-12-18 | 2018-05-15 | 广东美的暖通设备有限公司 | Switching device and there is its multi-gang air-conditioner |
| CN108131803A (en) * | 2017-12-18 | 2018-06-08 | 广东美的暖通设备有限公司 | The control method of multi-gang air-conditioner |
| CN110296519A (en) * | 2019-08-02 | 2019-10-01 | 宁波奥克斯电气股份有限公司 | A kind of control method of electric expansion valve, control system and multi-online air-conditioning system |
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| EP2426438A2 (en) * | 2010-08-27 | 2012-03-07 | Mitsubishi Heavy Industries | Multi-unit air conditioning system |
| CN104006584A (en) * | 2013-02-26 | 2014-08-27 | 广东美的暖通设备有限公司 | Triple-regulation air conditioner and refrigerant flowing direction switching device thereof |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
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