CN117109071A - Air conditioning system, control method thereof, controller and computer readable storage medium - Google Patents
Air conditioning system, control method thereof, controller and computer readable storage medium Download PDFInfo
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- CN117109071A CN117109071A CN202311200913.3A CN202311200913A CN117109071A CN 117109071 A CN117109071 A CN 117109071A CN 202311200913 A CN202311200913 A CN 202311200913A CN 117109071 A CN117109071 A CN 117109071A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000003507 refrigerant Substances 0.000 claims abstract description 254
- 238000001704 evaporation Methods 0.000 claims abstract description 68
- 230000008020 evaporation Effects 0.000 claims abstract description 63
- 238000005057 refrigeration Methods 0.000 claims abstract description 44
- 238000010257 thawing Methods 0.000 claims abstract description 36
- 238000009833 condensation Methods 0.000 claims abstract description 26
- 230000005494 condensation Effects 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 50
- 238000010586 diagram Methods 0.000 description 9
- 238000007710 freezing Methods 0.000 description 9
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- 239000003921 oil Substances 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
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- 238000004781 supercooling Methods 0.000 description 7
- 239000010687 lubricating oil Substances 0.000 description 6
- 230000008014 freezing Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
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Classifications
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
Abstract
The application discloses an air conditioning system, a control method thereof, a controller and a computer readable storage medium. The air conditioning system comprises an indoor unit, an outdoor unit and a valve assembly, wherein the indoor unit is provided with an indoor heat exchanger, the outdoor unit is provided with a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger, and the valve assembly is used for adjusting the flow direction of refrigerant among the indoor heat exchanger, the compressor, the first outdoor heat exchanger and the second outdoor heat exchanger. In the low-load cooling mode or the indoor defrosting mode, the first outdoor heat exchanger performs condensation processing, and the second outdoor heat exchanger performs evaporation processing. The second outdoor heat exchanger is used as an evaporator, so that the evaporation temperature of a part of the second outdoor heat exchanger can be shared, and the situation that the indoor unit is frozen or condensed due to too low evaporation temperature in a low-load refrigeration mode is avoided; defrosting indoors can reduce the influence on the indoor environment temperature by transferring all or most of the evaporation process to the outdoor unit.
Description
Technical Field
The present application relates to the field of air conditioners, and in particular, to an air conditioning system, a control method thereof, a controller and a computer readable storage medium.
Background
In the related art, for the outdoor unit currently on the market, a single heat exchanger is generally used, and the outdoor heat exchanger can only operate in one mode of the evaporator or the condenser when the unit is operated. There are often the following problems: first, because the minimum output of the unit compressor is not matched with the minimum capacity of the evaporator of the indoor unit, the evaporation temperature of the unit in a low-temperature refrigeration working condition is low, so that the unit is easy to enter into anti-freezing protection shutdown, and the unit condensation is unqualified when the condensation working condition is operated. Second, the indoor ambient temperature may fluctuate greatly during defrosting operation.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides an air conditioning system, a control method thereof, a controller and a computer readable storage medium, which aim to solve the problem of freezing and condensation caused by too low evaporation temperature of an indoor unit and reduce fluctuation of indoor environment temperature during defrosting.
In a first aspect, an embodiment of the present application provides an air conditioning system, including:
the indoor unit is provided with an indoor heat exchanger;
an outdoor unit provided with a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger;
A valve assembly for adjusting a refrigerant flow direction between the indoor heat exchanger, the compressor, the first outdoor heat exchanger and the second outdoor heat exchanger;
and in a low-load refrigeration mode or an indoor defrosting mode, the first outdoor heat exchanger performs condensation processing, and the second outdoor heat exchanger performs evaporation processing, wherein the low-load refrigeration mode is a refrigeration mode corresponding to an indoor refrigeration load smaller than a preset load.
The technical scheme of the first aspect of the application has at least one of the following advantages or beneficial effects: the outdoor unit comprises a first outdoor heat exchanger and a second outdoor heat exchanger, and the control valve assembly is used for enabling the first outdoor heat exchanger to perform condensation treatment and the second outdoor heat exchanger to perform evaporation treatment under a low-load refrigeration mode of the air conditioning system; the second outdoor heat exchanger is used as an evaporator, so that part of refrigerant discharged from the exhaust port of the compressor can be consumed, the problem that the evaporation temperature of the indoor unit is too low to freeze due to the fact that the minimum output displacement of the compressor is too large is effectively solved, meanwhile, the second outdoor heat exchanger is used as the evaporator, part of the evaporation temperature can be shared, and freezing or condensation due to the fact that the evaporation temperature of the indoor unit is too low is further avoided; in addition, when the air conditioning system is in an indoor defrosting mode, the second outdoor heat exchanger is used as an evaporator through the control valve assembly, so that the refrigerant is evaporated in the second outdoor heat exchanger, and the fluctuation of indoor environment temperature is small through transferring all or most of evaporation treatment to the outdoor unit.
According to some embodiments of the application, in the low-load refrigeration mode, the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, a part of the refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger, and another part of the refrigerant flows back to the compressor after passing through the indoor heat exchanger.
According to some embodiments of the application, the valve assembly comprises a first four-way valve; and in the low-load refrigeration mode, the first four-way valve is used for communicating an exhaust port of the compressor with the first outdoor heat exchanger and is also used for communicating the second outdoor heat exchanger, the indoor heat exchanger and a return port of the compressor.
According to some embodiments of the application, the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the valve assembly comprises a first indoor control valve, and the first indoor control valve is arranged between the outdoor unit and the first indoor heat exchanger.
According to some embodiments of the present application, in the indoor defrost mode and with the first indoor control valve closed, a portion of the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, and the refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor through the second outdoor heat exchanger; and the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger, and the refrigerant flowing out of the second indoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger.
According to some embodiments of the present application, in the indoor defrosting mode, and when the opening degree of the first indoor control valve is smaller than a preset opening degree, a part of the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, a part of the refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger, and another part of the refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the first indoor heat exchanger; and the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger, and the refrigerant flowing out of the second indoor heat exchanger flows back to the compressor after passing through the first indoor heat exchanger.
According to some embodiments of the application, the valve assembly further comprises a first four-way valve and a second four-way valve; in the indoor defrosting mode, the first four-way valve is used for communicating an exhaust port of the compressor with the first outdoor heat exchanger and also used for communicating the second outdoor heat exchanger, the first indoor heat exchanger and a return port of the compressor; the second four-way valve is used for communicating an exhaust port of the compressor with the second indoor heat exchanger.
According to some embodiments of the application, the valve assembly comprises a first outdoor control valve and a second outdoor control valve, the first outdoor control valve is arranged between the first outdoor heat exchanger and the indoor heat exchanger, one end of the second outdoor control valve is communicated with one end of the second outdoor heat exchanger, and the other end is communicated with a refrigerant pipeline between the first outdoor heat exchanger and the first outdoor control valve; in the low-load refrigeration mode or the indoor defrosting mode, the first outdoor control valve and the second outdoor control valve are both in an open state.
According to some embodiments of the application, the valve assembly further comprises a first switch valve and a second switch valve, one end of the first switch valve is communicated to a refrigerant pipeline between the first outdoor control valve and the indoor heat exchanger, and the other end is communicated to the other end of the first outdoor heat exchanger and is also communicated to a return port of the compressor through the second switch valve.
According to some embodiments of the application, in the cooling mode, the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, the refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger to be subjected to supercooling treatment, and the refrigerant flowing out of the second outdoor heat exchanger flows through the indoor heat exchanger and then flows back to the compressor.
According to some embodiments of the application, in the heating mode, the refrigerant discharged from the compressor flows through the indoor heat exchanger, the refrigerant flowing out of the indoor heat exchanger flows through the second outdoor heat exchanger, and the refrigerant flowing out of the second outdoor heat exchanger flows through the first outdoor heat exchanger and then flows back to the compressor.
In a second aspect, an embodiment of the present application provides a control method of an air conditioning system, where the air conditioning system includes an indoor unit, an outdoor unit, and a valve assembly, the indoor unit is provided with an indoor heat exchanger, and the outdoor unit is provided with a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger; the control method comprises the following steps:
acquiring a target operation mode of the air conditioning system;
controlling the valve assembly to cause the first outdoor heat exchanger to perform a condensation process and the second outdoor heat exchanger to perform an evaporation process when the target operation mode is a low load cooling mode or an indoor defrost mode; the low-load refrigeration mode is a refrigeration mode corresponding to an indoor refrigeration load smaller than a preset load.
The technical scheme of the second aspect of the application has at least one of the following advantages or beneficial effects: when the air conditioner is started to operate, a target operation mode of the air conditioning system is obtained, and corresponding condensation and evaporation treatment is executed according to the target operation mode; when the target operation mode is a low-load refrigeration mode, the valve assembly is controlled so that the refrigerant discharged from the exhaust port of the compressor flows through the first outdoor heat exchanger to be condensed, and the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger flows through the second outdoor heat exchanger to be evaporated. The second outdoor heat exchanger is used as an evaporator, so that the problem that the minimum output displacement of the compressor is excessively large to cause unmatched with the minimum capacity of the indoor evaporator is solved, and the second outdoor heat exchanger is used as the evaporator and can share a part of evaporation temperature, so that the situation that the evaporation temperature of the indoor unit is excessively low to freeze or condensate can be reduced. When the target operation mode is an indoor defrosting mode, the valve assembly is controlled so that part of refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger flows through the second indoor heat exchanger to perform heating defrosting, and the second outdoor heat exchanger performs evaporation treatment.
According to some embodiments of the application, the valve assembly comprises a first four-way valve, a first outdoor control valve and a second outdoor control valve, wherein the first outdoor control valve is arranged between the first outdoor heat exchanger and the indoor heat exchanger, one end of the second outdoor control valve is communicated with one end of the second outdoor heat exchanger, and the other end of the second outdoor control valve is communicated with a refrigerant pipeline between the first outdoor heat exchanger and the first outdoor control valve; in the case where the target operation mode is a low load cooling mode, the controlling the valve assembly includes:
controlling the first four-way valve to be communicated with an exhaust port of the compressor and the first outdoor heat exchanger so that a refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
and controlling the first outdoor control valve and the second outdoor control valve to be in an opening state, and controlling the first four-way valve to be communicated with the second outdoor heat exchanger, the indoor heat exchanger and the air return port of the compressor, so that part of refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger, and the other part of refrigerant flows back to the compressor after passing through the indoor heat exchanger.
According to some embodiments of the application, the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the valve assembly comprises a first outdoor control valve, a second outdoor control valve, a first four-way valve, a second four-way valve, and a first indoor control valve, the first indoor control valve is disposed between the outdoor unit and the first indoor heat exchanger; in the case where the target operation mode is an indoor defrost mode, the controlling the valve assembly includes:
controlling the first four-way valve to be communicated with an exhaust port of a compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
controlling the first outdoor control valve and the second outdoor control valve to be in an open state, and controlling the first indoor control valve to be closed so that the refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger;
controlling the second four-way valve to be communicated with an exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
and controlling the first four-way valve to be communicated with the second outdoor heat exchanger and the air return port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger to flow back to the compressor.
According to some embodiments of the application, in the case where the target operation mode is an indoor defrost mode, the controlling the valve assembly further includes:
controlling the first four-way valve to be communicated with an exhaust port of a compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
controlling the first outdoor control valve and the second outdoor control valve to be in an opening state, and controlling the opening degree of the first indoor control valve to be smaller than a preset opening degree so that part of refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger and the other part of refrigerant flows through the first indoor heat exchanger;
controlling the second four-way valve to be communicated with an exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
and controlling the first four-way valve to be communicated with the second outdoor heat exchanger, the first indoor heat exchanger and the return air port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger and the first indoor heat exchanger to flow back to the compressor.
In a third aspect, an embodiment of the present application provides a controller, including: the control system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the control method in the technical scheme of the second aspect when running the computer program.
In a fourth aspect, an embodiment of the present application provides an air conditioning system, including a controller as described in the foregoing technical solution of the third aspect.
In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for performing the control method described in the technical solution of the second aspect.
According to the technical scheme provided by the embodiment of the application, the method has at least the following beneficial effects: the air conditioning system comprises an indoor unit, an outdoor unit and a valve assembly, wherein the indoor unit is provided with an indoor heat exchanger, the outdoor unit is provided with a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger, and the valve assembly is used for adjusting the flow direction of a refrigerant among the indoor heat exchanger, the compressor, the first outdoor heat exchanger and the second outdoor heat exchanger; in the low-load cooling mode or the indoor defrosting mode, the first outdoor heat exchanger performs condensation processing, and the second outdoor heat exchanger performs evaporation processing. In the embodiment of the application, the second outdoor heat exchanger is used as the evaporator in the low-load refrigeration mode, so that the evaporation temperature of a part of the evaporator can be shared, and the occurrence of freezing or condensation caused by too low evaporation temperature of the indoor unit can be reduced; in addition, in the embodiment of the application, the second outdoor heat exchanger is used as the evaporator in the indoor defrosting mode, so that the refrigerant is evaporated in the second outdoor heat exchanger, and the influence on the indoor environment temperature can be reduced by transferring all or most of evaporation treatment to the outdoor unit.
Additional aspects and advantages of the application 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 application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
Fig. 1 is a schematic structural view of an air conditioning system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an air conditioning system according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of an air conditioning system according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of an air conditioning system according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of an air conditioning system according to another embodiment of the present application;
fig. 6 is a flowchart of a control method of an air conditioning system according to an embodiment of the present application;
FIG. 7 is a flow chart of a method of controlling a valve assembly in the event that a target operating mode of an air conditioning system is a low load cooling mode, in accordance with one embodiment of the present application;
FIG. 8 is a flow chart of a method of controlling a valve assembly in the case where a target operation mode of an air conditioning system is an indoor defrost mode, according to one embodiment of the present application;
FIG. 9 is a flow chart of a method of controlling a valve assembly in the case where a target operation mode of an air conditioning system is an indoor defrost mode, according to one embodiment of the present application;
fig. 10 is a schematic structural diagram of a controller according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
In the description of the present application, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the related art, the outdoor unit in the air conditioning system currently on the market generally adopts a single heat exchanger, so that the outdoor heat exchanger can only operate in one mode of the evaporator or the condenser when the unit is in operation, or the outdoor heat exchanger of a part of machine types is provided with a supercooling flow path, but the supercooling flow path is only used for improving the supercooling degree when the unit is in refrigeration operation. Therefore, when the air conditioning system is in a low-load refrigeration mode, the minimum output of the unit compressor and the minimum capacity of the indoor unit evaporator are easily mismatched, so that the evaporation temperature of the unit is too low under a low-temperature refrigeration working condition, and the indoor evaporator is frosted, thereby affecting the refrigeration energy efficiency of the air conditioning system, and the unit is easily stopped due to the fact that the evaporation temperature of the unit is too low under the low-temperature refrigeration working condition and enters an anti-freezing protection machine, and the normal operation of the air conditioning system is affected. When the air conditioning system is in a defrosting working condition, the outdoor unit can only be used as a condenser due to the fact that only a single heat exchanger is arranged on the outdoor unit, and therefore indoor environment temperature fluctuation is large when the air conditioning system is operated in the defrosting working condition. In addition, when the air conditioning system is in a condensation working condition, the minimum output of the unit compressor is not matched with the minimum capacity of the evaporator of the indoor unit, so that the unit condensation is disqualified.
Based on the above, the embodiment of the application provides an air conditioning system, a control method, a controller and a computer readable storage medium thereof, which are beneficial to solving the problem that the evaporation temperature of an indoor unit is too low to freeze and condense, and reducing the fluctuation of indoor environment temperature during defrosting.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present application, wherein the air conditioning system includes an indoor unit 100, an outdoor unit and a valve assembly, wherein an indoor heat exchanger 101 is disposed in the indoor unit 100, and an outdoor unit is provided with a compressor 300, a first outdoor heat exchanger 210 and a second outdoor heat exchanger 220; the valve assembly is used for adjusting the refrigerant flow direction among the indoor heat exchanger 101, the compressor 300, the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220; in the low load cooling mode or the indoor defrost mode, the first outdoor heat exchanger 210 performs a condensation process and the second outdoor heat exchanger 220 performs an evaporation process.
By arranging the outdoor unit comprising the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220, when the air conditioning system is in a low-load refrigeration mode, a refrigerant pipeline between a refrigerant outlet of the first outdoor heat exchanger 210 and a refrigerant inlet of the second outdoor heat exchanger 220 is communicated through a control valve assembly, so that the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor heat exchanger 220 to absorb heat by evaporation, and the second outdoor heat exchanger 220 is used as an evaporator, so that the evaporation temperature of a part of the air conditioning system can be shared, and the situation that the evaporation temperature of the indoor unit 100 is too low to freeze or condensate can be reduced; in addition, when the air conditioning system is in the indoor defrosting mode, the control valve assembly enables the refrigerant pipeline between the refrigerant outlet of the first outdoor heat exchanger 210 and the refrigerant inlet of the second outdoor heat exchanger 220 to be communicated, so that the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor heat exchanger 220 to evaporate, and the second outdoor heat exchanger 220 is used as an evaporator, and by transferring all or most of evaporation treatment to the outdoor unit, the influence on the indoor environment temperature can be reduced, so that the indoor environment temperature change of the air conditioning system is small in the indoor defrosting mode, and the running stability of the air conditioning system is improved.
It should be noted that, in some embodiments of the present application, the low-load cooling mode is a cooling mode corresponding to an indoor cooling load being smaller than a preset load.
It should be noted that, in some embodiments of the present application, the valve assembly includes at least a first four-way valve 410, the first four-way valve 410 is disposed in a refrigerant pipeline between the compressor 300 and the outdoor heat exchanger, and the first four-way valve 410 is used to adjust a refrigerant flow direction between the indoor heat exchanger 101, the compressor 300, the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220. When the air conditioning system is in the low load cooling mode, the first four-way valve 410 is used for communicating the exhaust port of the compressor 300 with the first outdoor heat exchanger 210, the first four-way valve 410 is also used for communicating the second outdoor heat exchanger 220, the indoor heat exchanger 101 and the return port of the compressor 300, so that the refrigerant discharged from the exhaust port of the compressor 300 flows through the first outdoor heat exchanger 210 through the first four-way valve 410, and a part of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor heat exchanger 220 and flows back to the return port of the compressor 300 through the refrigerant outlet of the second outdoor heat exchanger 220; another part of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the indoor heat exchanger 101 and flows back to the return port of the compressor 300 through the refrigerant outlet of the indoor heat exchanger 101. The air conditioning system uses the second outdoor heat exchanger 220 as an evaporator in a low-load refrigeration mode, and can share a part of evaporation temperature, so that the situation that the indoor unit 100 is frozen or condensed due to too low evaporation temperature can be prevented, the air conditioner is prevented from entering an anti-freezing protection stop, the normal operation of the low-load refrigeration mode of the air conditioning system is ensured, and the refrigeration energy efficiency of the air conditioning system is ensured.
In the related art, when the air conditioning system is in a refrigerating working condition, the problem that the minimum output of the compressor is larger than the minimum capacity of the evaporator of the indoor unit and the refrigerant capacity is not matched easily occurs, namely, the minimum output displacement of the compressor is overlarge, so that the evaporating temperature of the air conditioning system in a low-temperature refrigerating working condition is too low, water in condensed air is frosted on the surface of a refrigerant pipeline, and the problem of freezing and condensation is continuously thickened. Therefore, in order to ensure the normal operation of the air conditioning system, defrosting is required.
Referring to fig. 2, fig. 2 is a schematic structural view of another air conditioning system according to an embodiment of the present application, wherein the air conditioning system includes an indoor unit 100, an outdoor unit and a valve assembly, wherein an indoor heat exchanger is disposed in the indoor unit 100, and the outdoor unit is provided with a compressor 300, a first outdoor heat exchanger 210 and a second outdoor heat exchanger 220; the valve assembly is used to adjust the refrigerant flow direction between the indoor heat exchanger, the compressor 300, the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220. In some embodiments of the present application, the indoor heat exchangers include a first indoor heat exchanger 110 and a second indoor heat exchanger 120, and the valve assembly includes a first four-way valve 410, a second four-way valve 430, and a first indoor control valve 420, the first indoor control valve 420 being disposed between the outdoor unit and the first indoor heat exchanger 110. When the air conditioning system is in the indoor defrost mode and the first indoor control valve 420 is in the closed state, a portion of the high-temperature and high-pressure refrigerant discharged from the discharge port of the compressor 300 flows through the first outdoor heat exchanger 210 through the first four-way valve 410, and since the first indoor control valve 420 is in the closed state, a refrigerant pipe between a refrigerant outlet of the first outdoor heat exchanger 210 and the first indoor heat exchanger 110 is opened, so that the refrigerant discharged from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor heat exchanger 220, so that the refrigerant evaporates in the second outdoor heat exchanger 220, and the second outdoor heat exchanger 220 is used as an evaporator; meanwhile, another part of the refrigerant discharged from the discharge port of the compressor 300 flows through the second indoor heat exchanger 120 through the second four-way valve 430 to perform heating and defrosting, and the refrigerant flowing out of the refrigerant outlet of the second indoor heat exchanger 120 returns to the return port of the compressor 300 through the second outdoor heat exchanger 220 and the first four-way valve 410.
By arranging the outdoor unit comprising the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220, the air conditioning system is enabled to be in an indoor defrosting mode by controlling the first indoor control valve 420 to be closed, so that the refrigerant does not enter the first indoor heat exchanger 110 to perform evaporation treatment, namely, only the second indoor heat exchanger 120 in the indoor heat exchangers of the indoor unit 100 is subjected to condensation treatment, and the first indoor heat exchanger 110 is not subjected to evaporation treatment, so that the refrigerant only enters the second indoor heat exchanger 120 to perform heating, thereby defrosting is realized, the indoor environment temperature fluctuation of the air conditioning system is small, and the experience of a user is improved. For the evaporation process, the embodiment of the present application may transfer the function of the evaporation process to the second outdoor heat exchanger 220, that is, the second outdoor heat exchanger 220 is used as an evaporator to share the function of the evaporation process.
In another embodiment of the present application, the valve assembly includes a first four-way valve 410, a first indoor control valve 420 and a second four-way valve 430, the first indoor control valve 420 is disposed between the outdoor unit and the first indoor heat exchanger 110, the first indoor control valve 420 is used for controlling the refrigerant flow of the refrigerant pipe between the refrigerant outlet of the outdoor unit and the first indoor heat exchanger 110, the first four-way valve 410 is used for communicating the exhaust port of the compressor 300 with the first outdoor heat exchanger 210 and also for communicating the second outdoor heat exchanger 220, the indoor heat exchanger and the return port of the compressor 300, and the second four-way valve 430 is used for communicating the exhaust port of the compressor 300 with the second indoor heat exchanger 120. When the air conditioning system is in the indoor defrost mode and the opening degree of the first indoor control valve 420 is smaller than the preset opening degree, a portion of the refrigerant discharged from the discharge port of the compressor 300 flows through the first outdoor heat exchanger 210 through the first four-way valve 410, and a portion of the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 flows through the first indoor heat exchanger 110 and/or the second outdoor heat exchanger 220, and is evaporated and then flows back to the return port of the compressor 300. Since the opening degree of the first indoor control valve 420 is smaller than the preset opening degree, another small part of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the first indoor heat exchanger 110 to be evaporated, and since the opening degree of the first indoor control valve 420 is smaller, the indoor temperature fluctuation is smaller; meanwhile, another part of the refrigerant discharged from the discharge port of the compressor 300 flows through the second indoor heat exchanger 120 through the second four-way valve 430 to perform heating and defrosting, and a part of the refrigerant flowing out of the refrigerant outlet of the second indoor heat exchanger 120 flows through the first indoor heat exchanger 110 through the first indoor control valve 420, and another part of the refrigerant returns to the return port of the compressor through the second outdoor heat exchanger 220.
Because the opening degree of the first indoor control valve 420 is smaller than the preset opening degree, the amount of the refrigerant flowing through the first indoor heat exchanger 110 for evaporation treatment becomes smaller, so that the indoor temperature fluctuation is smaller, a part of the refrigerant discharged from the exhaust port of the compressor 300 flows through the second indoor heat exchanger 120 through the second four-way valve 430 for heating and defrosting, the indoor heat exchanger comprises the first indoor heat exchanger 110 and the second indoor heat exchanger 120, the indoor defrosting efficiency of the air conditioning system can be improved, but meanwhile, the refrigerant entering the indoor machine 100 for evaporation can be prevented from being too much by controlling the opening degree of the first indoor control valve 420 to be smaller than the preset opening degree, and the second outdoor heat exchanger 220 is used as an evaporator, so that most of evaporation treatment can be transferred to the outdoor machine, the influence of the air conditioning system on the indoor environment temperature during indoor defrosting can be reduced, the indoor temperature environment fluctuation is small, and the user experience is improved.
It should be noted that, in the embodiment of the present application, by setting the preset opening to one or more of 20 to 35, the flow rate of the refrigerant flowing through the first indoor heat exchanger 110 can be reduced, so as to ensure that the amount of the refrigerant entering the first indoor heat exchanger 110 for evaporation treatment does not excessively cause large indoor temperature fluctuation. The application does not limit the preset opening degree, and a person skilled in the art can set one or more of different working conditions, indoor temperature and outdoor temperature of the air conditioner according to actual needs.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another air conditioning system according to an embodiment of the present application; the valve assembly includes a first four-way valve 410, a second four-way valve 430, and further includes a first outdoor control valve 440 and a second outdoor control valve 450, wherein when the air conditioning system is in the indoor defrost mode, the first four-way valve 410 communicates the exhaust port of the compressor 300 with the first outdoor heat exchanger 210, and the first four-way valve 410 is further used to communicate the second outdoor heat exchanger 220, the first indoor heat exchanger 110 and the return port of the compressor 300; the second four-way valve 430 is used to communicate the discharge port of the compressor 300 with the second indoor heat exchanger 120. The first outdoor control valve 440 is disposed between the first outdoor heat exchanger 210 and the indoor heat exchanger, and one end of the second outdoor control valve 450 is connected to one end of the second outdoor heat exchanger 220, and the other end is connected to a refrigerant line between the first outdoor heat exchanger 210 and the first outdoor control valve 440. The valve assembly further includes a first indoor control valve 420, and the first indoor control valve 420 is disposed between the outdoor unit and the first indoor heat exchanger 110.
In some embodiments of the present application, when the air conditioning system is in the low-load cooling mode, the first outdoor control valve 440 is opened, the second outdoor control valve 450 is opened, and the first indoor control valve 420 is closed, so that after the refrigerant flowing out of the refrigerant outlet of the compressor 300 flows through the first outdoor heat exchanger 210, the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second indoor heat exchanger 120 through the first outdoor control valve 440, a part of the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor control valve 450 to be evaporated and then flows back to the air return port of the compressor 300, and another part of the refrigerant flows through the second indoor heat exchanger 120 to be subjected to heat exchange. When the air conditioning system is in the indoor defrost mode, the first outdoor control valve 440 is opened, the second outdoor control valve 450 is opened, and the first indoor control valve 420 is closed, so that a portion of the refrigerant discharged from the discharge port of the compressor 300 flows through the second indoor heat exchanger 120 through the second four-way valve 430 to perform heating defrost, and another portion of the refrigerant discharged from the discharge port of the compressor 300 flows through the first outdoor heat exchanger 210 through the first four-way valve 410 to be evaporated through the second outdoor heat exchanger 220. In the embodiment of the application, when the air conditioning system is in the low-load refrigeration mode or the indoor defrosting mode, the first outdoor control valve 440 and the second outdoor control valve 450 are both in the open state, so that the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 enters the second outdoor heat exchanger 220 to evaporate, and the part of evaporation temperature is shared, thereby reducing the influence on the indoor environment temperature, avoiding frosting caused by too low indoor temperature of the air conditioning system in the low-load refrigeration mode, avoiding great indoor temperature fluctuation of the air conditioning system in the indoor defrosting mode, and improving the user experience.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another air conditioning system according to an embodiment of the present application, wherein the valve assembly includes a first four-way valve 410, a second four-way valve 430, a first indoor control valve 420, a first outdoor control valve 440, and a second outdoor control valve 450, and further includes a first switching valve 460 and a second switching valve 470, one end of the first switching valve 460 is connected to a refrigerant line between the first outdoor control valve 440 and the indoor heat exchanger, and the other end is connected to the other end of the first outdoor heat exchanger 210 and is also connected to a return port of the compressor 300 through the second switching valve 470. The valve assembly further includes a second indoor control valve 480, and the second indoor control valve 480 is disposed between the outdoor unit and the second indoor heat exchanger 120. When the first switch valve 460 is closed and the second switch valve 470 is opened, the refrigerant pipe between the refrigerant outlet of the first outdoor heat exchanger 210 and the air return port of the compressor 300 is in an open state, so that a part of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows into the second outdoor heat exchanger 220 to exchange heat, and the refrigerant evaporates and absorbs heat in the second outdoor heat exchanger 220, so that a part of the evaporating temperature can be shared, a part of the refrigerant discharged from the air outlet of the compressor 300 can be consumed, and the problem that the evaporating temperature of the indoor unit 100 is too low and frozen due to the excessive minimum output displacement of the compressor 300 is effectively solved. In addition, the other part of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the indoor heat exchanger to perform heat exchange, the refrigerant evaporates to absorb heat, refrigeration is realized, and the refrigerant after heat exchange flows out from the refrigerant outlet of the indoor heat exchanger and flows back to the air return port of the compressor 300, thus completing the refrigeration cycle.
In some embodiments of the present application, when the air conditioning system is in the low load cooling mode, the valve assembly is in a state in which the first outdoor control valve 440 is opened, the second outdoor control valve 450 is opened, the first indoor control valve 420 is opened, the second indoor control valve 480 is opened, the first switching valve 460 is closed, and the second switching valve 470 is opened, such that the refrigerant discharged from the discharge port of the compressor 300 passes through the first four-way valve 410 and flows through the first outdoor heat exchanger 210, and flows out from the refrigerant outlet of the first outdoor heat exchanger 210, a portion of the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 passes through the first indoor control valve 420 and flows through the first indoor heat exchanger 110 through the first outdoor control valve 440, and flows through the second indoor heat exchanger 120 through the second indoor control valve 480, the refrigerant having completed the heat exchange in the first indoor heat exchanger 110 returns to the return port of the compressor 300 through the first four-way valve 410, and the refrigerant having completed the heat exchange in the second indoor heat exchanger 120 returns to the return port of the compressor 300 through the second four-way valve 430. Another part of the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 passes through the second outdoor control valve 450 to be evaporated through the second outdoor heat exchanger 220, and returns to the return port of the compressor 300 through the second on-off valve 470 and the second four-way valve 430. The second outdoor heat exchanger 220 is used as an evaporator, so that the problem that the evaporation temperature of the indoor unit 100 is too low to freeze due to the fact that the minimum output displacement of the compressor 300 is too large can be effectively solved, meanwhile, part of evaporation heat can be shared, the freezing or condensation of the indoor unit 100 due to the too low evaporation temperature is prevented, the air conditioner is prevented from entering an anti-freezing protection stop mode, and the normal operation of the air conditioning system in a low-load refrigeration mode is guaranteed.
In some embodiments of the present application, when the air conditioning system is in the indoor defrost mode, the valve assembly is in a state in which the first outdoor control valve 440 is opened, the second outdoor control valve 450 is opened, the first indoor control valve 420 is closed, the second indoor control valve 480 is opened, the first switching valve 460 is closed, and the second switching valve 470 is opened, such that the refrigerant discharged from the discharge port of the compressor 300 passes through the first four-way valve 410 and then flows through the first outdoor heat exchanger 210, a portion of the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 passes through the second outdoor control valve 450 and then flows through the second outdoor heat exchanger 220 for evaporation treatment, and returns to the return port of the compressor 300 through the second switching valve 470 and the second four-way valve 430, and at the same time, another portion of the refrigerant discharged from the discharge port of the compressor 300 passes through the second four-way valve 430 and then flows through the second indoor heat exchanger 120 for condensation heating, thereby performing defrost. By controlling the first indoor control valve 420 to be closed, the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 does not enter the first indoor heat exchanger 110 to perform evaporation treatment, namely, only the second indoor heat exchanger 120 in the indoor heat exchangers of the indoor units 100 performs condensation treatment, and the embodiment of the application transfers the function of evaporation treatment to the second outdoor heat exchanger 220, namely, the second outdoor heat exchanger 220 is used as an evaporator to share the work of evaporation treatment, so that the indoor environment temperature fluctuation of the air conditioning system is small, and the experience of a user is improved.
It should be noted that, in some embodiments of the present application, the first indoor control valve 420 and the second indoor control valve 480 are used for controlling the flow of the refrigerant, the first indoor control valve 420 and the second indoor control valve 480 are electronic expansion valves, and may be one or more of thermal expansion valves, manual expansion valves and capillaries, and the embodiments of the present application do not limit the types of the first indoor control valve 420 and the second indoor control valve 480.
It should be noted that, in some embodiments of the present application, the first outdoor control valve 440 and the second outdoor control valve 450 are electronic expansion valves, and may be one or more of thermal expansion valves, manual expansion valves, and capillaries, and the embodiments of the present application are not limited to the types of the first indoor control valve 420 and the second indoor control valve 480.
In some embodiments of the present application, the electronic expansion valve includes an electromagnetic expansion valve and an electric expansion valve, wherein the electromagnetic expansion valve is in an open position before the electromagnetic coil is energized, and the magnitude of the opening of the needle valve is controlled by the voltage applied to the coil, so that the flow rate of the expansion valve is regulated, and the valve action of the electromagnetic expansion valve is fast in response.
It should be noted that, in some embodiments of the present application, the first switch valve 460 and the second switch valve 470 are one or more of a solenoid valve and a stop valve, where the solenoid valve includes one or more of a check valve, a safety valve, and a directional control valve; the shut-off valve includes one or more of a straight-through shut-off valve, an angle shut-off valve, and a plunger shut-off valve, and the types of the first and second switching valves 460 and 470 are not limited in the embodiment of the present application.
The straight-flow type stop valve is applied to the straight-flow type or Y-shaped stop valve, and the flow passage of the valve body and the main flow passage form an oblique line, so that the damage degree of the flow state is smaller than that of the conventional stop valve, and the pressure loss through the valve is correspondingly smaller. It is often used for fluids containing solid particles or having a high viscosity. For an angle shut-off valve, in the angle shut-off valve, the fluid only needs to change direction once, so that the pressure drop through the valve is smaller than that of a shut-off valve with a conventional structure, and the valve is suitable for a shut-off valve with a small drift diameter and higher pressure. The plunger type stop valve is a variation of the conventional stop valve, and the valve is mainly used for opening or closing, but is provided with a plunger in a special form or a special collar, and can also be used for adjusting the flow. The straight-through type stop valve is the most widely used valve in industry, but has the greatest resistance.
Referring to fig. 4, fig. 4 is a schematic structural view of another air conditioning system according to an embodiment of the present application, the air conditioning system includes an air conditioning system including an indoor unit 100, an outdoor unit and a valve assembly, wherein an indoor heat exchanger is disposed in the indoor unit 100, and the outdoor unit is provided with a compressor 300, a first outdoor heat exchanger 210 and a second outdoor heat exchanger 220; the valve assembly is used to adjust the refrigerant flow direction between the indoor heat exchanger, the compressor 300, the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220. In an embodiment of the present application, the valve assembly includes a first four-way valve 410, a second four-way valve 430, a first outdoor control valve 440, a second outdoor control valve 450, a first switching valve 460, a second switching valve 470, a first indoor control valve 420, and a second indoor control valve 480.
When the air conditioning system is in the cooling mode, the valve assembly is in a state that the first outdoor control valve 440 is closed, the second outdoor control valve 450 is opened, the first switch valve 460 is opened, the second switch valve 470 is closed, the first indoor control valve 420 is opened, and the second indoor control valve 480 is opened, so that the high-temperature refrigerant discharged from the air outlet of the compressor 300 flows through the first outdoor heat exchanger 210 to perform condensation treatment, the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor control valve 450 to perform supercooling treatment, the refrigerant flowing out of the refrigerant outlet of the second outdoor heat exchanger 220 flows through the first indoor control valve 420 to flow through the first indoor heat exchanger 110, and simultaneously flows through the second indoor control valve 480 to flow through the second indoor heat exchanger 120 to perform evaporation treatment, the refrigerant flowing out of the refrigerant outlet of the first indoor heat exchanger 110 flows back to the air return port of the compressor 300 through the first four-way valve 410, the refrigerant flowing out of the refrigerant outlet of the second indoor heat exchanger 120 flows through the second valve 430 to flow back to the four-way valve 300 to perform cooling circulation.
Through using the second outdoor heat exchanger 220 as a condenser, the refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger 210 flows through the second outdoor heat exchanger 220 to be subjected to supercooling treatment, so that the temperature of the refrigerant is reduced, the refrigerating efficiency is improved, meanwhile, flash gas generated in the throttling process of the refrigerant can be reduced through supercooling treatment, the unit refrigerating capacity is improved, and therefore the heat exchange of an air conditioning system is more sufficient, and the refrigerating effect of the air conditioning system is further improved.
In some embodiments of the present application, when the air conditioning system is in the heating mode, the first four-way valve 410 is in communication with the exhaust port of the compressor 300 and the first indoor heat exchanger 110, the first four-way valve 410 is also in communication with the first indoor heat exchanger 110 and the return port of the compressor 300, the second four-way valve 430 is in communication with the exhaust port of the compressor 300 and the second indoor heat exchanger 120, and the second four-way valve 430 is also in communication with the second indoor heat exchanger 120 and the return port of the compressor 300; the valve assembly is in a state that the first outdoor control valve 440 is closed, the second indoor unit is opened, the first switching valve 460 is opened, and the second switching valve 470 is closed, so that a portion of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 300 flows through the first four-way valve 410 to be condensed by the first indoor heat exchanger 110, the gaseous refrigerant condenses to liquefy and release heat, and the indoor air is heated at the same time, thereby achieving the purpose of increasing the indoor temperature. The condensed refrigerant flows through the second outdoor heat exchanger 220 through the first switch valve 460 to be evaporated, the evaporated refrigerant is gasified to absorb heat, and the evaporated refrigerant flows out from the refrigerant outlet of the second outdoor heat exchanger 220 and flows back to the return port of the compressor 300 after flowing through the first outdoor heat exchanger 210 through the second outdoor control valve 450. The other part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 300 flows through the second four-way valve 430 to be condensed by the second indoor heat exchanger 120, the condensed refrigerant flows through the second outdoor heat exchanger 220 by the second indoor control valve 480 and the first switch valve 460, and the refrigerant flowing out of the refrigerant outlet of the second outdoor heat exchanger 220 flows through the first outdoor heat exchanger 210 by the second outdoor control valve 450 to flow back to the return port of the compressor 300.
When the air conditioning system is in the heating mode, the first four-way valve 410 is communicated with the first indoor heat exchanger 110, the second four-way valve 430 is connected with the second indoor heat exchanger 120, and the two indoor heat exchangers can be independently controlled to cool, dehumidify and heat by heating through controlling the first four-way valve 410 and the second four-way valve 430, so that the problem of large indoor temperature fluctuation in the heating and dehumidifying process can be avoided, and the user experience is improved.
Referring to fig. 5, fig. 5 is a schematic structural view of another air conditioning system according to an embodiment of the present application, wherein the air conditioning system includes an indoor unit 100, an outdoor unit and a valve assembly, wherein an indoor heat exchanger is disposed in the indoor unit 100, and the outdoor unit is provided with a compressor 300, a first outdoor heat exchanger 210 and a second outdoor heat exchanger 220; the valve assembly is used for adjusting the refrigerant flow direction among the indoor heat exchanger, the compressor 300, the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220, and also comprises an oil separator 600 and a gas-liquid separator 500, wherein the inlet end of the gas-liquid separator 500 is connected with a second switch valve 470, and the outlet end of the gas-liquid separator 500 is connected with a return air port of the compressor 300; an inlet end of the oil separator 600 is connected to an exhaust port of the compressor 300, a refrigerant output end is connected to the first four-way valve 410 and the second four-way valve 430, and an oil output end is connected to an inlet end or an outlet end of the gas-liquid separator 500. The refrigerant may not be completely evaporated in the evaporator, and mixed with the mixed gas having the particle properties of excessively damp and excessively wet or lubricating oil possibly entrained in the gas may affect the performance of the compressor 300 if entering the compressor 300. Therefore, the gas-liquid separator 500 is required to be arranged before the refrigerant enters the compressor 300 for separation, and the gas-liquid separator 500 can separate the gaseous refrigerant and the liquid refrigerant, and can prevent the liquid refrigerant or lubricating oil from accumulating too much to cause the liquid impact on the compressor 300, thereby effectively protecting the normal operation of the compressor 300. In the vapor compression refrigerating system, the compressed ammonia vapor or freon vapor is in a high-pressure high-temperature overheat state, and partial lubricating oil on the cylinder wall is inevitably discharged into oil vapor and oil drop particles together with the refrigerant vapor under the action of high temperature due to high flow speed and high temperature during discharge. However, ammonia and oil are not mutually dissolved, so when lubricating oil enters the condenser and the evaporator together with the refrigerant, the lubricating oil is condensed into a layer of oil film on the heat transfer wall surface, so that the heat resistance is increased, the heat transfer effect of the condenser and the evaporator is reduced, and the refrigeration effect is reduced. An oil separator 600 is provided between the compressor 300 and the outdoor heat exchanger in some embodiments of the present application so as to separate the lubricating oil mixed in the refrigerant vapor, thereby enhancing the refrigerating effect.
Referring to fig. 6, fig. 6 is a control method of an air conditioning system according to an embodiment of the present application, the air conditioning system including an indoor unit including an indoor heat exchanger, an outdoor unit including a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger, and a valve assembly, the control method of the air conditioning system including steps S100 to S200, specifically,
step S100: acquiring a target operation mode of an air conditioning system;
step S200: when the target operation mode is a low load cooling mode or an indoor defrosting mode, controlling the valve assembly so that the first outdoor heat exchanger performs condensation processing and the second outdoor heat exchanger performs evaporation processing; the low-load refrigeration mode is a refrigeration mode corresponding to an indoor refrigeration load smaller than a preset load.
In some embodiments of the present application, a control method of an air conditioning system includes obtaining a target operation mode of the air conditioning system when an air conditioner is turned on and performing corresponding condensation and evaporation processes according to the target operation mode; when the target operation mode is a low-load refrigeration mode, the valve assembly is controlled so that the refrigerant discharged from the exhaust port of the compressor flows through the first outdoor heat exchanger to be condensed, and the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger flows through the second outdoor heat exchanger to be evaporated. The second outdoor heat exchanger is used as an evaporator, so that the problem that the minimum output displacement of the compressor is excessively large to cause unmatched with the minimum capacity of the indoor evaporator is solved, and the second outdoor heat exchanger is used as the evaporator and can share a part of evaporation temperature, so that the situation that the evaporation temperature of the indoor unit is excessively low to freeze or condensate can be reduced.
In some embodiments of the present application, a control method of an air conditioning system includes obtaining a target operation mode of the air conditioning system when the air conditioner is turned on, controlling a valve assembly to cause a first outdoor heat exchanger to perform condensation processing and a second outdoor heat exchanger to perform evaporation processing when the target operation mode is an indoor defrost mode, and using the second outdoor heat exchanger as an evaporator to cause another portion of refrigerant flowing out of a refrigerant outlet of the first outdoor heat exchanger to evaporate in the second outdoor heat exchanger, thereby enabling to reduce an influence on an indoor environment temperature when the air conditioning system performs indoor defrost processing by transferring all or most of the evaporation processing to an outdoor unit.
Referring to fig. 7, fig. 7 is a control method of a valve assembly in case that a target operation mode of an air conditioning system is a low load cooling mode according to an embodiment of the present application; in some embodiments of the present application, an air conditioning system includes an indoor unit including an indoor heat exchanger, an outdoor unit including a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger, and a valve assembly including a first four-way valve, a first outdoor control valve, and a second outdoor control valve, the first outdoor control valve being disposed between the first outdoor heat exchanger and the indoor heat exchanger, one end of the second outdoor control valve being connected to one end of the second outdoor heat exchanger, and the other end being connected to a refrigerant line between the first outdoor heat exchanger and the first outdoor control valve. The control method of the valve assembly in the case where the target operation mode of the air conditioning system is the low load cooling mode includes steps S300 to S400, specifically,
Step S300: controlling the first four-way valve to be communicated with the exhaust port of the compressor and the first outdoor heat exchanger so that the refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
step S400: the first outdoor control valve and the second outdoor control valve are controlled to be in an open state, and the first four-way valve is controlled to be communicated with the second outdoor heat exchanger, the indoor heat exchanger and the air return port of the compressor, so that part of refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger, and the other part of refrigerant flows back to the compressor after passing through the indoor heat exchanger.
The control method of the valve assembly under the condition that the target operation mode of the air conditioning system is a low-load refrigeration mode comprises the steps of controlling a first four-way valve to be communicated with a refrigerant pipeline between an exhaust port of the compressor and a first outdoor heat exchanger, controlling the first four-way valve to be communicated with a second outdoor heat exchanger, controlling a refrigerant pipeline between an indoor heat exchanger and a return air port of the compressor, and controlling a first outdoor switch valve to be opened and a second outdoor switch valve to be opened, so that a refrigerant discharged from the exhaust port of the compressor flows through the first outdoor heat exchanger, and a part of refrigerant flowing out from a refrigerant outlet of the first outdoor heat exchanger flows through the indoor heat exchanger to be evaporated, and flows back to the return air port of the compressor through a refrigerant outlet of the indoor heat exchanger; the other part of refrigerant flowing out from the refrigerant outlet of the first outdoor heat exchanger flows through the second outdoor heat exchanger to be evaporated, and returns to the air return port of the compressor through the refrigerant outlet of the second outdoor heat exchanger. The second outdoor heat exchanger is used as an evaporator, so that the evaporating temperature of a part of the second outdoor heat exchanger can be shared, the refrigerant discharged from the exhaust port of the compressor can be consumed, and the problem that the evaporating temperature of the indoor unit is too low to freeze due to the fact that the minimum output displacement of the compressor is too large is effectively solved.
Referring to fig. 8, fig. 8 is a control method of a valve assembly in case that a target operation mode of an air conditioning system is an indoor defrost mode according to an embodiment of the present application; the air conditioning system comprises an indoor unit, an outdoor unit and a valve assembly, wherein the indoor unit comprises a first indoor heat exchanger and a second indoor heat exchanger, the outdoor unit comprises a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger, and the valve assembly comprises a first outdoor control valve, a second outdoor control valve, a first four-way valve, a second four-way valve and a first indoor control valve; the control method of the valve assembly in the case where the target operation mode of the air conditioning system is the indoor defrost mode includes steps S500 to S800, specifically,
step S500: controlling the first four-way valve to be communicated with the exhaust port of the compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
step S600: the first outdoor control valve and the second outdoor control valve are controlled to be in an open state, and the first indoor control valve is controlled to be closed so that the refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger;
step S700: controlling the second four-way valve to be communicated with the exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
Step S800: and controlling the first four-way valve to be communicated with the second outdoor heat exchanger and the air return port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger to flow back to the compressor.
Acquiring a target operation mode of the air conditioning system, controlling a first four-way valve to be communicated with a refrigerant pipeline between an exhaust port of the compressor and a first outdoor heat exchanger, controlling a first outdoor control valve and a second outdoor control valve to be opened and controlling the first indoor control valve to be closed under the condition that the target operation mode of the air conditioning system is an indoor defrosting mode, controlling the second four-way valve to be connected with the refrigerant pipeline between the exhaust port of the compressor and the second indoor heat exchanger, enabling a part of refrigerant flowing out from the exhaust port of the compressor to flow through the first outdoor heat exchanger, enabling the refrigerant flowing out from a refrigerant outlet of the first outdoor heat exchanger to flow through the second outdoor heat exchanger for evaporation treatment, and enabling the refrigerant flowing out from a refrigerant outlet of the second outdoor heat exchanger to flow back to a return air port of the compressor; and the other part of refrigerant discharged from the exhaust port of the compressor flows through the second four-way valve to heat through the second indoor heat exchanger so as to defrost. By controlling the first indoor switch valve to be closed, the refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger does not enter the first indoor heat exchanger to be subjected to evaporation treatment, namely, only the second indoor heat exchanger in the indoor heat exchangers of the indoor units is subjected to condensation treatment, so that the indoor environment temperature fluctuation of the air conditioning system is small, and the experience of users is improved. For the evaporation treatment, the second outdoor heat exchanger is used as an evaporator, so that the refrigerant is evaporated in the second outdoor heat exchanger, and the influence on the indoor environment temperature when the indoor defrosting treatment is performed on the air conditioning system can be reduced by transferring all the evaporation treatment to the outdoor unit, so that the indoor temperature change is small.
Referring to fig. 9, fig. 9 is a control method of a valve assembly in the case where a target operation mode of an air conditioning system is an indoor defrost mode, the air conditioning system including an indoor unit including a first indoor heat exchanger and a second indoor heat exchanger, an outdoor unit including a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger, and a valve assembly including a first outdoor control valve, a second outdoor control valve, a first four-way valve, a second four-way valve and a first indoor control valve, the control method of the valve assembly in the case where the target operation mode of the air conditioning system is the indoor defrost mode, including steps S900 to S1200:
step S900: controlling the first four-way valve to be communicated with the exhaust port of the compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
step S1000: controlling the first outdoor control valve and the second outdoor control valve to be in an opening state, and controlling the opening degree of the first indoor control valve to be smaller than a preset opening degree so that part of refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger, and the other part of refrigerant flows through the first indoor heat exchanger;
Step S1100: controlling the second four-way valve to be communicated with the exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
step S1200: and controlling the first four-way valve to be communicated with the second outdoor heat exchanger, the first indoor heat exchanger and the air return port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger and the first indoor heat exchanger to flow back to the compressor.
Acquiring a target operation mode of the air conditioner, controlling the first four-way valve to be communicated with the exhaust port of the compressor and the first outdoor heat exchanger, controlling the first outdoor control valve and the second outdoor control valve to be opened when the air conditioner system is in an indoor defrosting mode, enabling a refrigerant discharged from the exhaust port of the compressor to flow through the first outdoor heat exchanger, controlling the opening degree of the first indoor control valve to be smaller than a preset opening degree, enabling a part of refrigerant flowing out from a refrigerant outlet of the first outdoor heat exchanger to flow through the first indoor heat exchanger, and enabling the refrigerant flowing out from a refrigerant outlet of the first indoor heat exchanger to flow back to a return port of the compressor; the first outdoor control valve and the second outdoor control valve are controlled to be opened, so that the other part of refrigerant flowing out of the refrigerant outlet of the first outdoor heat exchanger flows through the second outdoor heat exchanger to evaporate, and most of evaporation treatment is transferred to the second outdoor evaporator, so that fluctuation of indoor environment temperature can be reduced; and controlling a refrigerant pipeline between the exhaust port of the second four-way valve communicated compressor and the second indoor heat exchanger so that the other part of refrigerant discharged from the exhaust port of the compressor flows through the second indoor heat exchanger to be condensed, and the refrigerant heats and defrost the second indoor heat exchanger.
The indoor heat exchanger comprises the first indoor heat exchanger and the second indoor heat exchanger, the first outdoor control valve is controlled to be opened, the second outdoor control valve is controlled to be opened, refrigerant discharged from the exhaust port of the compressor simultaneously flows through the first indoor heat exchanger and the second indoor heat exchanger to conduct heat exchange, the opening degree of the first indoor control valve is controlled to be smaller than the preset opening degree, the refrigerant flow flowing through the first indoor heat exchanger is ensured not to be excessive, and most of evaporation treatment is transferred to the second outdoor evaporator, so that fluctuation of indoor environment temperature of the air conditioning system during defrosting can be reduced. The first four-way valve and the second four-way valve are controlled to independently control the two indoor heat exchangers to cool, dehumidify and heat the heat, so that the problem of large indoor temperature fluctuation in the heating and dehumidifying process can be avoided, and the user experience is improved.
The preset opening is one or more of 20 to 35, and in the embodiment of the application, the flow rate of the refrigerant flowing through the first indoor heat exchanger can be reduced by setting the preset opening to 20 to 35, so that the large indoor temperature fluctuation caused by excessive refrigerant entering the indoor unit is avoided. The application does not limit the preset opening degree, and a person skilled in the art can set one or more of different working conditions, indoor temperature and outdoor temperature of the air conditioner according to actual needs.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a controller 1000 according to an embodiment of the present application, including a processor 1001, which may be implemented by a general-purpose CPU (Central Processing Unit ), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing related programs to implement a control method of an air conditioning system according to an embodiment of the present application; the Memory 1002 may be implemented in the form of a Read Only Memory 1002 (ROM), a static storage device, a dynamic storage device, or a random access Memory 1002 (Random Access Memory, RAM). Memory 1002 may store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present disclosure are implemented in software or firmware, relevant program codes are stored in memory 1002 and invoked by processor 1001 to perform the embodiments of the present disclosure; an input/output interface 1003 for implementing information input and output; the communication interface 1004 is configured to implement communication interaction between the present device and other devices, and may implement communication in a wired manner (e.g. USB, network cable, etc.), or may implement communication in a wireless manner (e.g. mobile network, WIFI, bluetooth, etc.); a bus that transfers information between the various components of the device (e.g., the processor 1001, memory 1002, input/output interfaces 1003, and communication interfaces 1004); wherein the processor 1001, the memory 1002, the input/output interface 1003, and the communication interface 1004 realize communication connection between each other inside the device through a bus.
In addition, an embodiment of the present application also provides an air conditioning system, including the controller of the above embodiment.
It should be noted that, since the air conditioning system according to the embodiment of the present application includes the controller according to the above embodiment, and the controller according to the above embodiment is capable of executing the control method according to any one of the above embodiments, the specific implementation and technical effect of the air conditioning system according to the embodiment of the present application may refer to the specific implementation and technical effect of the control method according to any one of the above embodiments.
Furthermore, an embodiment of the present application also provides a computer-readable storage medium storing computer-executable instructions for performing the above-described control method. Illustratively, the method steps in fig. 6-9 described above are performed.
It should be noted that, since the computer readable storage medium according to the embodiment of the present application is capable of executing the control method according to any one of the embodiments described above, reference may be made to the specific implementation and technical effects of the control method according to any one of the embodiments described above.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and may include any information delivery media.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present application, and these equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (18)
1. An air conditioning system, comprising:
the indoor unit is provided with an indoor heat exchanger;
an outdoor unit provided with a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger;
a valve assembly for adjusting a refrigerant flow direction between the indoor heat exchanger, the compressor, the first outdoor heat exchanger and the second outdoor heat exchanger;
and in a low-load refrigeration mode or an indoor defrosting mode, the first outdoor heat exchanger performs condensation processing, and the second outdoor heat exchanger performs evaporation processing, wherein the low-load refrigeration mode is a refrigeration mode corresponding to an indoor refrigeration load smaller than a preset load.
2. The air conditioning system according to claim 1, wherein in the low-load cooling mode, the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, a part of the refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor through the second outdoor heat exchanger, and another part of the refrigerant flows back to the compressor through the indoor heat exchanger.
3. The air conditioning system of claim 2, wherein the valve assembly comprises a first four-way valve; and in the low-load refrigeration mode, the first four-way valve is used for communicating an exhaust port of the compressor with the first outdoor heat exchanger and is also used for communicating the second outdoor heat exchanger, the indoor heat exchanger and a return port of the compressor.
4. The air conditioning system of claim 1, wherein the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the valve assembly comprising a first indoor control valve disposed between the outdoor unit and the first indoor heat exchanger.
5. The air conditioning system according to claim 4, wherein in the indoor defrost mode and with the first indoor control valve closed, a portion of refrigerant discharged from the compressor flows through the first outdoor heat exchanger, and refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor through the second outdoor heat exchanger; and the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger, and the refrigerant flowing out of the second indoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger.
6. The air conditioning system according to claim 4, wherein in the indoor defrost mode and in the case where the opening degree of the first indoor control valve is smaller than a preset opening degree, a part of refrigerant discharged from the compressor flows through the first outdoor heat exchanger, a part of refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor through the second outdoor heat exchanger, and another part of refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor through the first indoor heat exchanger; and the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger, and the refrigerant flowing out of the second indoor heat exchanger flows back to the compressor after passing through the first indoor heat exchanger.
7. The air conditioning system of claim 5 or 6, wherein the valve assembly further comprises a first four-way valve and a second four-way valve; in the indoor defrosting mode, the first four-way valve is used for communicating an exhaust port of the compressor with the first outdoor heat exchanger and also used for communicating the second outdoor heat exchanger, the first indoor heat exchanger and a return port of the compressor; the second four-way valve is used for communicating an exhaust port of the compressor with the second indoor heat exchanger.
8. The air conditioning system of claim 1, wherein the valve assembly includes a first outdoor control valve disposed between the first outdoor heat exchanger and the indoor heat exchanger and a second outdoor control valve having one end in communication with one end of the second outdoor heat exchanger and the other end in communication with a refrigerant line between the first outdoor heat exchanger and the first outdoor control valve; in the low-load refrigeration mode or the indoor defrosting mode, the first outdoor control valve and the second outdoor control valve are both in an open state.
9. The air conditioning system of claim 8, wherein the valve assembly further comprises a first on-off valve and a second on-off valve, one end of the first on-off valve being connected to a refrigerant line between the first outdoor control valve and the indoor heat exchanger, the other end being connected to the other end of the first outdoor heat exchanger and also being connected to a return port of the compressor through the second on-off valve.
10. The air conditioning system according to claim 1, wherein in the cooling mode, the refrigerant discharged from the compressor flows through the first outdoor heat exchanger, the refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger to be supercooled, and the refrigerant flowing out of the second outdoor heat exchanger flows through the indoor heat exchanger to return to the compressor.
11. The air conditioning system according to claim 1, wherein in the heating mode, the refrigerant discharged from the compressor flows through the indoor heat exchanger, the refrigerant flowing out of the indoor heat exchanger flows through the second outdoor heat exchanger, and the refrigerant flowing out of the second outdoor heat exchanger flows through the first outdoor heat exchanger and then flows back to the compressor.
12. The control method of the air conditioning system is characterized in that the air conditioning system comprises an indoor unit, an outdoor unit and a valve assembly, wherein the indoor unit is provided with an indoor heat exchanger, and the outdoor unit is provided with a compressor, a first outdoor heat exchanger and a second outdoor heat exchanger; the control method comprises the following steps:
acquiring a target operation mode of the air conditioning system;
controlling the valve assembly to cause the first outdoor heat exchanger to perform a condensation process and the second outdoor heat exchanger to perform an evaporation process when the target operation mode is a low load cooling mode or an indoor defrost mode; the low-load refrigeration mode is a refrigeration mode corresponding to an indoor refrigeration load smaller than a preset load.
13. The control method of claim 12, wherein the valve assembly comprises a first four-way valve, a first outdoor control valve and a second outdoor control valve, the first outdoor control valve being disposed between the first outdoor heat exchanger and the indoor heat exchanger, one end of the second outdoor control valve being in communication with one end of the second outdoor heat exchanger, the other end being in communication with a refrigerant line between the first outdoor heat exchanger and the first outdoor control valve; in the case where the target operation mode is a low load cooling mode, the controlling the valve assembly includes:
Controlling the first four-way valve to be communicated with an exhaust port of the compressor and the first outdoor heat exchanger so that a refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
and controlling the first outdoor control valve and the second outdoor control valve to be in an opening state, and controlling the first four-way valve to be communicated with the second outdoor heat exchanger, the indoor heat exchanger and the air return port of the compressor, so that part of refrigerant flowing out of the first outdoor heat exchanger flows back to the compressor after passing through the second outdoor heat exchanger, and the other part of refrigerant flows back to the compressor after passing through the indoor heat exchanger.
14. The control method of claim 12, wherein the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the valve assembly comprises a first outdoor control valve, a second outdoor control valve, a first four-way valve, a second four-way valve, and a first indoor control valve, the first indoor control valve is disposed between the outdoor unit and the first indoor heat exchanger; in the case where the target operation mode is an indoor defrost mode, the controlling the valve assembly includes:
Controlling the first four-way valve to be communicated with an exhaust port of a compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
controlling the first outdoor control valve and the second outdoor control valve to be in an open state, and controlling the first indoor control valve to be closed so that the refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger;
controlling the second four-way valve to be communicated with an exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
and controlling the first four-way valve to be communicated with the second outdoor heat exchanger and the air return port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger to flow back to the compressor.
15. The control method according to claim 14, wherein in the case where the target operation mode is an indoor defrost mode, the controlling the valve assembly further includes:
controlling the first four-way valve to be communicated with an exhaust port of a compressor and the first outdoor heat exchanger so that part of refrigerant discharged by the compressor flows through the first outdoor heat exchanger;
Controlling the first outdoor control valve and the second outdoor control valve to be in an opening state, and controlling the opening degree of the first indoor control valve to be smaller than a preset opening degree so that part of refrigerant flowing out of the first outdoor heat exchanger flows through the second outdoor heat exchanger and the other part of refrigerant flows through the first indoor heat exchanger;
controlling the second four-way valve to be communicated with an exhaust port of the compressor and the second indoor heat exchanger so that the other part of refrigerant discharged by the compressor flows through the second indoor heat exchanger;
and controlling the first four-way valve to be communicated with the second outdoor heat exchanger, the first indoor heat exchanger and the return air port of the compressor so as to enable the refrigerant flowing out of the second outdoor heat exchanger and the first indoor heat exchanger to flow back to the compressor.
16. A controller, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the control method according to any one of claims 12 to 15 when the computer program is executed.
17. An air conditioning system comprising the controller of claim 16.
18. A computer-readable storage medium, characterized by: computer executable instructions for performing the control method according to any one of claims 12 to 15 are stored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311200913.3A CN117109071A (en) | 2023-09-15 | 2023-09-15 | Air conditioning system, control method thereof, controller and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311200913.3A CN117109071A (en) | 2023-09-15 | 2023-09-15 | Air conditioning system, control method thereof, controller and computer readable storage medium |
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| CN117109071A true CN117109071A (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311200913.3A Pending CN117109071A (en) | 2023-09-15 | 2023-09-15 | Air conditioning system, control method thereof, controller and computer readable storage medium |
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| Country | Link |
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| CN (1) | CN117109071A (en) |
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- 2023-09-15 CN CN202311200913.3A patent/CN117109071A/en active Pending
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