CN111486568A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN111486568A CN111486568A CN202010356447.8A CN202010356447A CN111486568A CN 111486568 A CN111486568 A CN 111486568A CN 202010356447 A CN202010356447 A CN 202010356447A CN 111486568 A CN111486568 A CN 111486568A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000009825 accumulation Methods 0.000 claims abstract description 132
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000001704 evaporation Methods 0.000 claims description 59
- 230000008020 evaporation Effects 0.000 claims description 51
- 238000010257 thawing Methods 0.000 claims description 51
- 239000003507 refrigerant Substances 0.000 claims description 40
- 238000005057 refrigeration Methods 0.000 claims description 31
- 230000002829 reductive effect Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005338 heat storage Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000036961 partial effect Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system and a control method thereof, wherein the system comprises: the outdoor unit comprises a compressor, an outdoor heat exchanger, a first throttling device, a pressure adjusting module and a cold accumulation module, wherein the pressure adjusting module comprises a second four-way valve, a one-way valve and a second throttling device; the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, the first end of the cold accumulator is connected between the outdoor heat exchanger and the first throttling device through the cold accumulation throttling device, the second end of the cold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is connected with the high-pressure liquid pipe through the second control valve.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an air conditioning system and a control method of the air conditioning system.
Background
In high-temperature summer, the outdoor temperature at noon is high, the heat dissipation effect of a condenser is poor, the high pressure of a refrigerating system is high, and in order to ensure reliability, the refrigerating capacity output of the system has to be limited, but the refrigerating requirement is very large at the moment, and the system cannot meet the refrigerating requirement; at night, the outdoor temperature is low, the heat dissipation effect of the condenser is good, the refrigerating capacity of the system is good, the refrigerating requirement is less in the daytime at the moment, the refrigerating capacity is remained, the phenomenon of frequent shutdown occurs, and the operating energy efficiency of the system is reduced. If can move the refrigerating capacity part night to daytime and use, can satisfy the refrigeration demand daytime on the one hand, on the other hand reduces opening of refrigerating system night and stops, and the refrigerating system efficiency at night is higher daytime, and peak valley price of electricity is also low night, can reduce the whole working costs of system.
At present, a heat pump system with cold accumulation exists, but the following problems exist: the evaporation temperature required by the cold accumulator and the indoor unit is not consistent, for the cold accumulator, the ice storage is the best choice for reducing the cost and the volume, but the evaporation temperature of the refrigeration system is required to be lower than 0 ℃ for the ice storage, and for the indoor unit, on one hand, the evaporation temperature of the refrigeration system is required to be higher than 0 ℃ for ensuring the indoor unit not to freeze, and on the other hand, when the cold accumulation is allowed, the indoor refrigeration requirement is usually small, and the evaporation temperature of the refrigeration system is required to be as high as possible for improving the energy efficiency of the system and reducing the start and stop. Therefore, the requirements of the cold accumulator and the refrigeration indoor unit are opposite, the evaporation pressure requirements of the cold accumulator and the refrigeration indoor unit on the system are inconsistent, the evaporation pressure needs to be reduced when the requirements of the cold accumulator are met, the energy efficiency of the system is reduced at the moment, the output capacity of the indoor unit is overlarge, the indoor unit is frequently started and stopped, and the heat exchanger has a freezing risk. In addition, during defrosting, the liquid return amount is large during defrosting, defrosting is slow, and the reliability of the compressor and the indoor comfort level are affected. This difficulty leads to a greater difficulty in cold storage application in air conditioning systems, and generally only additional dedicated cold storage systems can be added.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the invention is to provide an air conditioning system, which separates the evaporation temperature required by the cold accumulator from the indoor unit, the cold accumulation does not affect the normal refrigeration operation of the indoor unit at all, saves the system operation cost, improves the output capacity of the refrigeration system in the peak period, and the cold accumulator can be used as a heat accumulator in the season of easy frost formation, thereby solving the heat required by partial frost formation, accelerating the frost formation speed, reducing the liquid return of the compressor during the frost formation, and improving the system reliability and comfort.
The second objective of the invention is to provide a control method of the air conditioning system.
A third object of the invention is to propose a computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an air conditioning system, including an outdoor unit and at least one indoor unit, where the outdoor unit is connected to each indoor unit through a high-pressure air pipe, a low-pressure air pipe and a liquid pipe, the outdoor unit includes a compressor, an outdoor heat exchanger, a first throttling device, a pressure adjusting module and a cold storage module, where the pressure adjusting module includes a second four-way valve, a one-way valve and a second throttling device, a first end of the second four-way valve is connected to the high-pressure air pipe, a second end of the second four-way valve is connected to a return air port of the compressor, a third end of the second four-way valve is connected to the low-pressure air pipe through the one-way valve, and a fourth end of the second four-way valve is connected to the; the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, wherein the first end of the cold accumulator is connected with the outdoor heat exchanger through the cold accumulation throttling device, the second end of the cold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is connected with the high-pressure liquid pipe through the second control valve.
According to the air conditioning system provided by the embodiment of the invention, the pressure adjusting module and the cold accumulation module are added, wherein the pressure adjusting module comprises a second four-way valve, a one-way valve and a second throttling device, the first end of the second four-way valve is connected with a high-pressure air pipe, the second end of the second four-way valve is connected with an air return port of a compressor, the third end of the second four-way valve is connected with a low-pressure air pipe through the one-way valve, and the fourth end of the second four-way valve is connected with the low-pressure air pipe; the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, the first end of the cold accumulator is connected between the outdoor heat exchanger and the first throttling device through the cold accumulation throttling device, the second end of the cold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is connected with the high-pressure liquid pipe through the second control valve. Therefore, the system can separate the evaporation temperature required by the cold accumulator and the indoor unit, the cold accumulation does not influence the normal refrigeration operation of the indoor unit completely, the system operation cost is saved, the output capacity of the refrigeration system in the peak period is improved, the cold accumulator can be used as a heat accumulator in the season of easy frosting, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of the compressor in the defrosting process is reduced, and the system reliability and the comfort are improved.
In addition, the air conditioning system proposed according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the air conditioning system has a cold accumulation mode, wherein in the cold accumulation mode, the outdoor unit is controlled to perform a cooling operation, and the first throttling device is controlled to be opened, the cold accumulation throttling device is opened, the first control valve is opened, the second control valve is closed, a first end of the second four-way valve is communicated with a third end, a second end of the second four-way valve is communicated with a fourth end, and an opening degree of the second throttling device is adjusted according to an evaporation pressure of the indoor unit.
According to an embodiment of the present invention, the air conditioning system has a cold storage utilization mode, wherein in the cold storage utilization mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be closed, the cold storage throttling device is opened, the first control valve is closed, the second control valve is opened, the first end and the fourth end of the second four-way valve are controlled to be communicated, the second end and the third end of the second four-way valve are controlled to be communicated, and the second throttling device is closed.
According to an embodiment of the present invention, the air conditioning system has a heat storage mode, wherein in the heat storage mode, the outdoor unit is controlled to perform a heating operation, the first throttle device is controlled to be opened, the cold storage throttle device is controlled to be opened, the first control valve is controlled to be opened, the second control valve is controlled to be closed, the first end of the second four-way valve is controlled to be communicated with the fourth end, the second end of the second four-way valve is controlled to be communicated with the third end, and the second throttle device is controlled to be closed.
According to an embodiment of the present invention, the air conditioning system has a first defrosting mode, wherein in the first defrosting mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be closed, the cold storage throttling device is opened, the first control valve is opened, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is closed.
According to an embodiment of the present invention, the air conditioning system has a second defrosting mode, wherein in the second defrosting mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be opened, the cold accumulation throttling device is closed, the first control valve is closed, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be opened.
According to an embodiment of the present invention, the air conditioning system has a continuous heating defrosting mode, wherein in the continuous heating defrosting mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be opened, the cold storage throttling device is controlled to be opened, the first control valve is controlled to be opened, the second control valve is controlled to be closed, the first end and the third end of the second four-way valve are controlled to be communicated, the second end and the fourth end of the second four-way valve are controlled to be communicated, and the second throttling device is controlled to be closed.
In order to achieve the above object, a second aspect of the present invention provides a control method of the air conditioning system, including the following steps: if the outdoor unit is determined to perform refrigeration operation, acquiring operation parameters of the compressor and cold accumulation time of the air conditioning system in a cold accumulation mode; and controlling the operation mode of the air conditioning system according to the operation parameters of the compressor and the cold accumulation time.
According to the control method of the air conditioning system, when the outdoor unit is determined to perform refrigeration operation, the operation parameters of the compressor and the cold accumulation time of the air conditioning system in the cold accumulation mode are obtained, and the operation mode of the air conditioning system is controlled according to the operation parameters of the compressor and the cold accumulation time. Therefore, the method can separate the evaporation temperature required by the cold accumulator and the indoor unit, the cold accumulation does not affect the normal refrigeration operation of the indoor unit completely, the system operation cost is saved, the output capacity of the refrigeration system in the peak period is improved, the cold accumulator can be used as a heat accumulator in the season of easy frosting, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of a compressor in the defrosting process is reduced, and the system reliability and comfort are improved.
In addition, the control method of the air conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the operation parameters of the compressor include an operation frequency, a discharge pressure and a current of the compressor, and the controlling of the operation mode of the air conditioning system according to the operation parameters of the compressor and the cold accumulation time includes: and determining that the operating frequency of the compressor is continuously smaller than a first frequency threshold value within a first time threshold value, the exhaust pressure of the compressor is continuously smaller than a first pressure threshold value within the first time threshold value, the current of the compressor is continuously smaller than a first current threshold value within the first time threshold value, and the cold accumulation time is smaller than a second time threshold value, and controlling the air conditioning system to enter the cold accumulation mode.
According to an embodiment of the present invention, the control method of the air conditioning system further includes: if the exhaust pressure of the compressor is larger than a second pressure threshold value, or the current of the compressor is larger than a second current threshold value, or the compressor is stopped, the air-conditioning system is controlled to exit the cold accumulation mode; and if the exhaust pressure of the compressor is determined to be less than or equal to the second pressure threshold, the current of the compressor is determined to be less than or equal to the second current threshold and the compressor is not stopped, the opening degree of the cold accumulation throttling device is obtained, and if the opening degree of the cold accumulation throttling device is determined to be continuously less than the first opening degree threshold within a third time threshold or the cold accumulation time is determined to be greater than a fourth time threshold, the air conditioning system is controlled to exit the cold accumulation mode.
According to an embodiment of the present invention, the controlling of the operation mode of the air conditioning system according to the operation parameter of the compressor and the cold storage time further includes: and determining that the operating frequency of the compressor is continuously greater than a second frequency threshold within a fifth time threshold, or the exhaust pressure of the compressor is continuously greater than a second pressure threshold within the fifth time threshold, or the current of the compressor is continuously greater than a second current threshold within the fifth time threshold, and the cold accumulation time is greater than a sixth time threshold, and controlling the air conditioning system to enter the cold accumulation utilization mode.
According to an embodiment of the present invention, the control method of the air conditioning system further includes: if the operating frequency of the compressor is determined to be smaller than a second frequency threshold value or the compressor is stopped, controlling the air-conditioning system to exit the cold accumulation utilization mode; and if the operating frequency of the compressor is determined to be greater than or equal to a second frequency threshold value and the compressor is not stopped, acquiring the first end temperature and the second end temperature of the regenerator, and if the temperature difference between the second end temperature and the first end temperature of the regenerator is determined to be continuously smaller than the first temperature threshold value within a seventh time threshold value or the cold accumulation utilization time is determined to be greater than an eighth time threshold value, controlling the air-conditioning system to exit the cold accumulation utilization mode.
According to an embodiment of the present invention, the control method of the air conditioning system further includes: and if the air conditioning system is determined to enter the cold accumulation mode, adjusting the opening degree of the second throttling device according to the evaporation temperature of the indoor unit, controlling the operating frequency of the compressor according to the evaporation temperature of the cold accumulator, and controlling the opening degree of the cold accumulation throttling device according to the superheat degree of a refrigerant at the outlet of the cold accumulator.
According to an embodiment of the present invention, the adjusting the opening degree of the second throttling means according to the evaporating temperature of the indoor unit includes: if the evaporation temperature of the indoor unit is determined to be less than or equal to a second temperature threshold value, the opening degree of the second throttling device is reduced; and if the evaporation temperature of the indoor unit is determined to be greater than a third temperature threshold value, increasing the opening degree of the second throttling device, wherein the third temperature threshold value is greater than the second temperature threshold value.
According to an embodiment of the present invention, the controlling of the operation frequency of the compressor according to the evaporation temperature of the regenerator includes: if the evaporation temperature of the regenerator is determined to be greater than a fourth temperature threshold, the operating frequency of the compressor is increased; and if the evaporation temperature of the cold accumulator is determined to be less than or equal to a fifth temperature threshold value, reducing the running frequency of the compressor, wherein the fourth temperature threshold value is greater than the fifth temperature threshold value.
According to an embodiment of the present invention, the controlling the opening degree of the cold storage throttling device according to the superheat degree of the cold storage outlet refrigerant comprises: if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be larger than or equal to a first threshold value, the opening degree of the cold accumulation throttling device is increased; and if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be smaller than or equal to a second threshold value, reducing the opening degree of the cold accumulation throttling device, wherein the first threshold value is larger than the second threshold value.
According to an embodiment of the present invention, the control method of the air conditioning system further includes: and if the opening degree of the third throttling device of any indoor unit is determined to be larger than the third opening degree threshold value, the opening degree of the second throttling device is increased, and the running frequency of the compressor is increased.
In order to achieve the above object, a third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, the program, when executed by a processor, implementing the control method of the air conditioning system described above.
According to the computer readable storage medium of the embodiment of the invention, by executing the control method of the air conditioning system, the evaporation temperatures required by the cold accumulator and the indoor unit can be separated, the cold accumulator does not influence the normal refrigeration operation of the indoor unit at all, the system operation cost is saved, the output capacity of the refrigeration system in the peak period is improved, the cold accumulator can be used as a heat accumulator in the season easy to frost, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of a compressor during defrosting is reduced, and the reliability and the comfort of the system are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
fig. 3 is a refrigerant flow diagram when the air conditioning system operates in the cold storage mode according to an embodiment of the present invention;
FIG. 4 is a logic diagram of a control method of an air conditioning system according to one embodiment of the present invention;
fig. 5 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
FIG. 6 is a logic diagram of a control method of an air conditioning system according to another embodiment of the present invention;
FIG. 7 is a schematic logic diagram for air conditioning system cold storage mode operation according to one embodiment of the present invention;
FIG. 8 is a logic diagram of a control method of an air conditioning system according to yet another embodiment of the present invention;
fig. 9 is a refrigerant flow diagram in a cold storage utilization mode of the air conditioning system according to an embodiment of the present invention;
fig. 10 is a refrigerant flow diagram in a heat accumulation mode of an air conditioning system according to an embodiment of the present invention;
fig. 11 is a schematic flow direction diagram of a refrigerant in a first defrosting mode of an air conditioning system according to an embodiment of the invention;
fig. 12 is a schematic flow direction diagram of a refrigerant in a second defrosting mode of the air conditioning system according to an embodiment of the present invention;
fig. 13 is a schematic flow diagram of a refrigerant in a defrosting mode without heating of the air conditioning system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An air conditioning system and a control method of the air conditioning system according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention.
As shown in fig. 1, an air conditioning system according to an embodiment of the present invention includes: the outdoor unit 10 is connected with each indoor unit through a high-pressure air pipe, a low-pressure air pipe and a liquid pipe, and the outdoor unit 20 comprises a compressor 1, an outdoor heat exchanger 2, a first throttling device EXVA, a pressure adjusting module 3 and a cold accumulation module 4.
The pressure adjusting module 3 may include a second four-way valve ST2, a check valve DXF1 and a second throttling device EXVB, a first end of the second four-way valve ST2 is connected to the high pressure air pipe, a second end of the second four-way valve ST2 is connected to the return air port of the compressor 1, a third end of the second four-way valve ST2 is connected to the low pressure air pipe through the check valve DXF1, and a fourth end of the second four-way valve ST2 is connected to the low pressure air pipe through the second throttling device EXVB. The cold accumulation module 4 comprises a cold accumulator 41, a cold accumulation throttling device EXVC, a first control valve 42 and a second control valve 43, wherein the first end of the cold accumulator 41 is connected between the outdoor heat exchanger 2 and the first throttling device EXVA through the cold accumulation throttling device EXVC, the second end of the cold accumulator 41 is connected with the fourth end of a second four-way valve ST2 through the first control valve 42, and the second end of the cold accumulator 41 is also connected with a high-pressure liquid pipe through the second control valve 43.
It should be noted that the plurality of indoor units 20 in fig. 1 may include two indoor units 21 as an example, and may include three indoor units or four indoor units, which is determined according to actual situations.
In addition, the air conditioning system operates in different modes under different control parameters, and the conditions of the air conditioning system operating in different modes, the refrigerant flow direction of the air conditioning system operating in the different modes, and the operating states of different components in the outdoor unit will be described in detail below.
As shown in fig. 2, the control method of the air conditioning system may include the following steps:
and S1, determining the outdoor unit to perform refrigeration operation, and acquiring the operation parameters of the compressor and the cold accumulation time of the air conditioning system in the cold accumulation mode.
Wherein, the cold storage mode is as follows: the cold energy is stored in the form of cold water, cold water or solidified phase-change materials by utilizing the refrigeration at the valley point at night, and the stored cold energy is partially or completely utilized to supply cold to the air conditioning system during the peak load period of the air conditioner, so that the aims of reducing the installation capacity of refrigeration equipment, reducing the operation cost and cutting the peak and filling the valley of the power load are fulfilled.
The operating parameters of the compressor may include: the operating frequency of the compressor, the discharge pressure of the compressor, the current of the compressor, etc.
And S2, controlling the operation mode of the air conditioning system according to the operation parameters of the compressor and the cold accumulation time.
According to an embodiment of the present invention, controlling an operation mode of an air conditioning system according to an operation parameter of a compressor and a cold storage time includes: and determining that the operating frequency of the compressor is continuously smaller than a first frequency threshold value within a first time threshold value, the exhaust pressure of the compressor is continuously smaller than a first pressure threshold value within the first time threshold value, the current of the compressor is continuously smaller than a first current threshold value within the first time threshold value, and the cold accumulation time is smaller than a second time threshold value, and controlling the air conditioning system to enter a cold accumulation mode. The first time threshold, the first frequency threshold, the first pressure threshold, the first current threshold and the second time threshold can be calibrated according to actual conditions.
Specifically, as shown in fig. 4, when the air conditioning system is in a cooling operation, the operation frequency of the compressor, the discharge pressure of the compressor, the current of the compressor, and the cold accumulation time when the air conditioning system is in the cold accumulation mode are obtained, and then the operation mode of the air conditioning system is determined, for example, when the operation frequency of the compressor is less than a first frequency threshold a1, the discharge pressure of the compressor is less than a first pressure threshold B1, the current of the compressor is less than a first current threshold C1, and the operation parameter of the compressor satisfies a corresponding condition duration time first time threshold t1, whether the cold accumulation time satisfies a condition is further determined, and when the cold accumulation time is less than a second time threshold t2, the air conditioning system is controlled to enter the cold.
When the system enters the cold accumulation mode, as shown in fig. 3, the outdoor unit is controlled to perform cooling operation, the first throttling device EXVA is controlled to be opened, the cold accumulation throttling device EXVC is opened to a proper opening degree, the first control valve 42 is opened, the second control valve 43 is closed, meanwhile, the second four-way valve ST2 is powered on, the first end of the second four-way valve ST2 is communicated with the third end, the second end of the second four-way valve ST2 is communicated with the fourth end, the opening degree of the second throttling device EXVB is adjusted according to the evaporation pressure of the indoor unit, and the second throttling device EXVB is communicated with the inlet of the low-pressure tank. After passing through the first four-way valve ST1 and the outdoor heat exchanger 2, the high-temperature and high-pressure gaseous refrigerant from the compressor 1 is a high-pressure liquid refrigerant, a part of the high-temperature and high-pressure liquid refrigerant passes through the cold accumulator through the cold accumulation throttling device EXVC, is used for storing cold energy, is changed into a gaseous refrigerant, flows into the inlet of the low-pressure tank through the second four-way valve ST2, and returns to the air suction port of the compressor 1; the other part of the refrigerant flows into the indoor unit through the high-pressure liquid pipe to be changed into low-pressure gaseous refrigerant, returns to the inlet of the low-pressure tank through the low-pressure gas pipe and the second throttling device EXVB and returns to the air suction port of the compressor 1.
Further, according to an embodiment of the present invention, the method for controlling an air conditioning system further includes: if the exhaust pressure of the compressor is larger than a second pressure threshold value, or the current of the compressor is larger than a second current threshold value, or the compressor is stopped, the air-conditioning system is controlled to exit the cold accumulation mode; and if the exhaust pressure of the compressor is determined to be less than or equal to the second pressure threshold, the current of the compressor is determined to be less than or equal to the second current threshold and the compressor is not stopped, the opening degree of the cold accumulation throttling device is obtained, and if the opening degree of the cold accumulation throttling device is determined to be continuously less than the first opening degree threshold in a third time threshold or the cold accumulation time is determined to be greater than a fourth time threshold, the air conditioning system is controlled to exit the cold accumulation mode. The second pressure threshold, the second current threshold, the third time threshold, the first opening degree threshold and the fourth time threshold can be calibrated according to actual conditions.
Specifically, as shown in fig. 4, when the air conditioning system enters the cold accumulation mode, the cold accumulation time is accumulated, and at the same time, the parameters of the compressor are judged in real time to determine whether the condition for exiting the cold accumulation mode is met, for example, when the exhaust pressure of the compressor is greater than a second pressure threshold B2, or the current of the compressor is greater than a second current threshold C2, or the compressor is stopped, the air conditioning system is controlled to exit the cold accumulation mode; when the exhaust pressure of the compressor is less than or equal to a second pressure threshold B2, the current of the compressor is less than or equal to a second current threshold C2, and the compressor is not stopped, further acquiring the opening degree of the cold accumulation throttling device, and controlling the air conditioning system to exit the cold accumulation mode and clear the cold accumulation time when judging that the opening degree of the cold accumulation throttling device is less than a first opening degree threshold D and continues for a third time threshold t3 or when judging that the cold accumulation time is greater than a fourth time threshold t 4.
The following describes how to realize that the temperature of the evaporator is controlled by the compressor, the evaporating temperature of the indoor unit is controlled by the second throttling device, and the flow rate of the cold storage refrigerant is controlled by the cold storage throttling device when the air conditioning system operates in the cold storage mode.
According to an embodiment of the present invention, as shown in fig. 5, determining that the air conditioning system enters the cold storage mode further includes:
and S51, adjusting the opening degree of the second throttling device according to the evaporation temperature of the indoor unit.
According to an embodiment of the present invention, adjusting the opening degree of the second throttling means according to the evaporating temperature of the indoor unit includes: if the evaporation temperature of the indoor unit is determined to be less than or equal to the second temperature threshold, the opening degree of the second throttling device is reduced; and if the evaporating temperature of the indoor unit is determined to be greater than a third temperature threshold, increasing the opening degree of the second throttling device, wherein the third temperature threshold is greater than the second temperature threshold, and the second temperature threshold and the third temperature threshold can be calibrated according to actual conditions, for example, the first temperature threshold can be 5 ℃ and the second temperature threshold can be 8 ℃. The evaporation temperature of the indoor unit can be the lowest evaporation temperature of the indoor unit, can also be the inlet temperature of an evaporator of the indoor unit, and can also be the middle temperature of the evaporator of the indoor unit.
Specifically, as shown in fig. 6, when the air conditioning system operates in the cold storage mode, the second four-way valve ST2 is powered on, the initial opening of the second throttling device is a set opening P1, a minimum value min (T2A) of the evaporation temperature of the indoor unit is obtained (it should be noted that the minimum value of the evaporation temperature may be a minimum evaporation temperature acquired in real time within a period of time), or an inlet temperature of an evaporator of the indoor unit, or a middle temperature of the evaporator of the indoor unit, and when the evaporation temperature min (T2A) of the indoor unit is less than or equal to a second temperature threshold temp1, the opening of the second throttling device is controlled to be reduced by a certain opening value P2; when the evaporation temperature of the indoor unit is greater than the second temperature threshold tmp1, further judging whether the evaporation temperature min (T2A) of the indoor unit is greater than a third temperature threshold temp2, and when min (T2A) > temp2, controlling the opening degree of the second throttling device to increase by a certain opening degree value P3; otherwise, the operation frequency of the compressor is controlled according to the evaporation temperature of the cold accumulator.
And S52, controlling the operation frequency of the compressor according to the evaporation temperature of the cold accumulator.
According to an embodiment of the present invention, controlling the operation frequency of the compressor according to the evaporation temperature of the regenerator includes: if the evaporation temperature of the regenerator is determined to be greater than the fourth temperature threshold, the operating frequency of the compressor is increased; and determining that the evaporation temperature of the regenerator is less than or equal to a fifth temperature threshold, and reducing the operating frequency of the compressor, wherein the fourth temperature threshold is greater than the fifth temperature threshold. The fourth temperature threshold and the fifth temperature threshold may be calibrated according to actual conditions, for example, the fourth temperature threshold may be-3 ℃, and the fifth temperature threshold may be-5 ℃.
Specifically, as shown in fig. 6, when min (T2A) ≦ temp2, the evaporating temperature Te of the regenerator is obtained and judged, wherein when the evaporating temperature Te of the regenerator is greater than the fourth temperature threshold temp3, the operating frequency of the compressor is controlled to be increased by a certain value A3; when the evaporation temperature Te of the regenerator is less than or equal to a fourth temperature threshold value temp3, judging whether the evaporation temperature Te of the regenerator is less than or equal to a fifth temperature threshold value temp4, and if the evaporation temperature Te of the regenerator is less than or equal to the fifth temperature threshold value temp4, controlling the running frequency of the compressor to be reduced by a certain value A4; otherwise, controlling the opening degree of the second throttling device and the running frequency of the compressor according to the opening degree of a third throttling device of the indoor unit.
According to an embodiment of the present invention, the control method of the air conditioning system further includes: and if the opening degree of the third throttling device of any indoor unit is determined to be larger than the third opening degree threshold value, the opening degree of the second throttling device is increased, and the running frequency of the compressor is increased. The third opening degree threshold may be calibrated according to an actual situation, for example, the third opening degree threshold may be 90% of a maximum opening degree allowed by a third throttling device of the indoor unit; the opening degree of the third throttling means of any one indoor unit may be a maximum opening degree value of the opening degrees of the third throttling means of the indoor units in an operating state among the plurality of indoor units.
Specifically, as shown in fig. 6, when the evaporation temperature Te of the regenerator is greater than the fifth temperature threshold temp4, the opening degree of the third throttling device of any one of the indoor units (EXVD in fig. 1 indicates the third throttling device) is obtained and judged, wherein when the opening degree of the third throttling device of any one of the indoor units is greater than the third opening degree threshold P4, the opening degree of the second throttling device is controlled to increase by a certain value P3, and the operating frequency of the compressor is increased; when the opening degree of the third throttling device of any indoor machine is smaller than or equal to the third opening degree threshold value P4, the states of the parameters (the running frequency of the compressor and the opening degree of the second throttling device) are kept unchanged.
And S53, controlling the opening of the cold accumulation throttling device according to the superheat degree of the refrigerant at the outlet of the cold accumulator.
According to one embodiment of the invention, the controlling the opening degree of the cold storage throttling device according to the superheat degree of the cold storage outlet refrigerant comprises the following steps: if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be larger than or equal to a first threshold value, the opening degree of the cold accumulation throttling device is increased; and if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be smaller than or equal to a second threshold value, reducing the opening degree of the cold accumulation throttling device, wherein the first threshold value is larger than the second threshold value, and the first threshold value and the second threshold value can be calibrated according to actual conditions.
Specifically, as shown in fig. 7, when the air conditioning system enters the cold storage mode operation, the initial opening degree of the cold storage throttling device is a set value P1 (the initial opening degree of the cold storage throttling device may be the same as or different from the initial opening degree of the second throttling device), and during the operation of the air conditioning system, a superheat degree X L SH of a cold storage outlet refrigerant is obtained in real time (where the superheat degree X L SH of the cold storage outlet refrigerant is TB-TA, TB is a temperature value obtained by a temperature sensor at the outlet of the cold storage, and TA is a temperature value obtained by a temperature sensor at the inlet of the cold storage), and is determined, wherein when the superheat degree X L SH of the cold storage outlet refrigerant is greater than or equal to a first threshold value temp5, the opening degree of the cold storage throttling device is controlled to be increased by a certain value P5, when X L SH < temp5, the superheat degree X L SH of the cold storage outlet refrigerant is further determined to be in a certain relationship with a second threshold value temp6, and when X2 SH is greater than or less than t L5, the opening degree of the cold storage throttling device is controlled to be decreased (the same as the cold storage throttling device), and when the cold storage throttle opening degree X L is increased to be equal to a certain value P68584, the cold storage device, the cold storage throttle device is.
According to another embodiment of the present invention, the controlling of the operation mode of the air conditioning system according to the operation parameter of the compressor and the cold storage time further comprises: and determining that the operating frequency of the compressor is continuously greater than the second frequency threshold within a fifth time threshold, or the exhaust pressure of the compressor is continuously greater than the second pressure threshold within the fifth time threshold, or the current of the compressor is continuously greater than the second current threshold within the fifth time threshold, and the cold accumulation time is greater than a sixth time threshold, and controlling the air conditioning system to enter a cold accumulation utilization mode. And the fifth time threshold, the second frequency threshold, the second pressure threshold, the second current threshold and the sixth time threshold can be calibrated according to actual conditions.
Specifically, as shown in fig. 8, when the air conditioning system is in a cooling operation, the operation frequency of the compressor, the discharge pressure of the compressor, the current of the compressor, and the cold storage time when the air conditioning system is in the cold storage mode are obtained, and then the operation mode of the air conditioning system is determined, for example, when the operation frequency of the compressor is greater than a second frequency threshold a2, or the discharge pressure of the compressor is greater than a second pressure threshold B2, or the current of the compressor is greater than a first current threshold C2, whether the cold storage time meets a condition is further determined, and when the cold storage time is greater than a sixth time threshold 539t 2, the air conditioning system is controlled to enter the cold storage utilization mode.
When the system enters the cold accumulation utilization mode, as shown in fig. 9, the outdoor unit is controlled to perform cooling operation, the first throttling device EXVA is controlled to be closed, the cold accumulation throttling device EXVC is opened to a preset maximum opening degree, the first control valve 42 is closed, the second control valve 43 is opened, the first end and the fourth end of the second four-way valve ST2 are controlled to be communicated, the second end and the third end of the second four-way valve ST2 are controlled to be communicated, and the second throttling device EXVB is controlled to be closed. After passing through the first four-way valve ST1 and the outdoor heat exchanger 2, the high-temperature and high-pressure refrigerant discharged from the compressor is high-pressure liquid refrigerant, passes through the cold accumulator 41 through the cold accumulation throttling device EXVC, absorbs cold accumulated in the cold accumulator 41, is sent to the indoor machine side through the electromagnetic valve 43 for refrigeration, the second four-way valve ST2 is powered off, the second throttling device EXVB is closed, and the low-pressure gaseous refrigerant from the indoor machine side returns through the low-pressure air pipe and the additional air pipe, returns to the inlet of the low-pressure tank 5 through the check valve DXF1 and the second four-way valve ST2 respectively, and returns to the air suction port of the compressor.
Further, according to an embodiment of the present invention, the method for controlling an air conditioning system further includes: if the operating frequency of the compressor is smaller than the second frequency threshold value or the compressor is stopped, controlling the air-conditioning system to exit the cold accumulation utilization mode; and if the operating frequency of the compressor is determined to be greater than or equal to the second frequency threshold and the compressor is not stopped, acquiring the first end temperature and the second end temperature of the regenerator, and determining that the temperature difference between the second end temperature and the first end temperature of the regenerator is continuously smaller than the first temperature threshold within a seventh time threshold or the cold accumulation utilization time is greater than an eighth time threshold, and controlling the air-conditioning system to exit the cold accumulation utilization mode. And the second frequency threshold, the seventh time threshold and the eighth time threshold can be calibrated according to actual conditions.
Specifically, as shown in fig. 8, when the air conditioning system enters the cold storage utilization mode, the cold storage utilization time is accumulated, and at the same time, the parameters of the compressor are judged in real time to determine whether the condition for exiting the cold storage utilization mode is met, for example, the running frequency of the compressor is less than a second frequency threshold value a2, or when the compressor is stopped, the air conditioning system is controlled to exit the cold storage utilization mode; when the operating frequency of the compressor is greater than or equal to the second frequency threshold A2 and the compressor is not stopped, further acquiring a first end temperature TA and a second end temperature TB of the cold accumulator, and when TB-TA is less than the first temperature threshold D and continues for a seventh time threshold t7 or the cold accumulation utilization time is greater than an eighth time threshold, controlling the air conditioning system to exit the cold accumulation utilization mode and clearing the cold accumulation utilization time.
Therefore, when the cold accumulation operation is carried out, a refrigerant with high evaporation temperature (for example, higher than 5 ℃) is provided for the indoor unit on one hand, the refrigeration requirement of the indoor unit is met, and meanwhile, the evaporator of the indoor unit is not frozen; on the other hand, the cold medium with lower evaporation temperature (such as lower than-2 ℃) is provided for the cold storage device, so that the requirement of phase change cold storage of the cold storage device is met, and one system can meet the requirements of refrigeration and cold storage at the same time. The cold accumulation operation is carried out when the system is in low load or the electricity price of the power grid is low, and the cold accumulation evaporation temperature is different from the indoor side evaporation temperature by adjusting the opening degree of the second throttling device, so that the cold accumulation operation and the common refrigeration can be carried out simultaneously when the system is in low load or the electricity price of valley.
The air conditioning system can also be used for heat storage and defrosting, so that in the season easy to frost, the cold accumulator can be used as a heat accumulator, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of the compressor during defrosting is reduced, and the reliability and comfort of the system are improved. According to one embodiment of the present invention, the air conditioning system has a heat storage mode, wherein in the heat storage mode, the outdoor unit is controlled to perform a heating operation, the first throttling device is controlled to be opened, the cold storage throttling device is controlled to be opened, the first control valve is controlled to be opened, the second control valve is controlled to be closed, the first end of the second four-way valve is controlled to be communicated with the fourth end, the second end of the second four-way valve is controlled to be communicated with the third end, and the second throttling device is controlled to be closed.
Specifically, as shown in fig. 10, when the air conditioning system operates in the heat storage mode, the second four-way valve ST2 is de-energized, the second throttling device EXVB is closed, the first electromagnetic valve 42 is opened, the second electromagnetic valve 43 is closed, the cold storage throttling device EXVC maintains a proper throttling opening degree (for example, the high-pressure saturation temperature-TA is controlled within a certain range), the high-temperature and high-pressure gaseous refrigerant enters the cold storage 41 through the second four-way valve ST2 and the first electromagnetic valve 42 to be released and condensed, and after being throttled by the cold storage throttling device EXVC, the gaseous refrigerant and the refrigerant returned by the heating indoor unit are merged and enter the evaporator to be evaporated and absorb heat, and after the cold storage is fully stored, the first electromagnetic valve 42 can be closed.
According to one embodiment of the present invention, the air conditioning system has a first defrosting mode, wherein in the first defrosting mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be closed, the cold storage throttling device is opened, the first control valve is opened, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be closed.
Specifically, as shown in fig. 11, the outdoor unit is controlled to perform a cooling operation, and when there is heat accumulated in the cold storage 41, the heat in the cold storage is preferentially utilized to defrost. At this time, the second four-way valve ST2 is powered on, the first electromagnetic valve 42 is opened, the second throttling device EXVB and the first throttling device EXVA are closed at the same time, the cold accumulation throttling device EXVC keeps proper throttling (for example, fixed opening), the liquid refrigerant generated by defrosting of the outdoor heat exchanger does not flow through the indoor unit any more, but is directly throttled by the cold accumulation throttling device EXVC and evaporated and gasified in the cold accumulator 41, the higher system pressure can be kept, the defrosting speed is accelerated, and meanwhile, the liquid refrigerant generated by defrosting does not return a large amount of liquid to the low-pressure tank.
According to another embodiment of the present invention, the air conditioning system has a second defrosting mode, wherein in the second defrosting mode, the outdoor unit is controlled to perform a cooling operation, the first throttling device is controlled to be opened, the cold storage throttling device is controlled to be closed, the first control valve is controlled to be closed, the second control valve is controlled to be closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be opened.
Specifically, as shown in fig. 12, the outdoor unit is controlled to perform cooling operation, when the amount of heat accumulated in the cold accumulator 41 is insufficient and the heat is exhausted (for example, the temperature at the outlet of the cold accumulator drops to TB < 15 ℃), defrosting of the outdoor heat exchanger is not completed, the cold accumulation throttling device EXVC is closed, the second throttling device EXVB and the first throttling device EXVA are opened, and the liquid refrigerant generated by defrosting of the outdoor heat exchanger absorbs a small amount of heat from the indoor space and returns to the low-pressure tank 5, so that the remaining defrosting time is completed.
According to one embodiment of the invention, the air conditioning system has a continuous heating defrosting mode, wherein in the continuous heating defrosting mode, the outdoor unit is controlled to perform cooling operation, the first throttling device is controlled to be opened, the cold accumulation throttling device is controlled to be opened, the first control valve is controlled to be opened, the second control valve is controlled to be closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be closed.
Specifically, as shown in fig. 13, the outdoor unit is controlled to perform cooling operation, and when the cold accumulator 41 is large enough, the outdoor unit can also perform defrosting without stopping heating, at this time, the second four-way valve ST2 is powered on, the first electromagnetic valve 42 and the first throttling device EXVA are opened, the second throttling device EXVB is closed at the same time, and the cold accumulation throttling device EXVC keeps proper throttling (such as fixed opening), and at this time, the cold accumulator is used as a heat accumulator, so that the indoor unit side can be heated while defrosting of the outdoor unit is ensured.
Therefore, the air conditioning system adopts ice for cold accumulation, the cold accumulator can also be used as a heat accumulator under the working condition of frosting easily in winter (from minus 3 ℃ to 5 ℃), when an outdoor unit is defrosted, extra defrosting heat is provided, the defrosting speed is accelerated, defrosting return liquid is reduced, the indoor comfort level is improved, and when the room temperature is lower, the air conditioning system can heat the cold accumulator at a small flow rate, ensure that the temperature is not lower than 0 ℃ and freeze, and can also drain water in the cold accumulator.
In summary, according to the air conditioning system and the control method thereof in the embodiments of the present invention, when it is determined that the outdoor unit performs cooling operation, the operation parameter of the compressor and the cold accumulation time of the air conditioning system in the cold accumulation mode are obtained, and the operation mode of the air conditioning system is controlled according to the operation parameter of the compressor and the cold accumulation time. Therefore, the evaporation temperature required by the cold accumulator and the indoor unit can be separated, the cold accumulation does not influence the normal refrigeration operation of the indoor unit completely, the system operation cost is saved, the output capacity of the refrigeration system in the peak period is improved, the cold accumulator can be used as a heat accumulator in the season of easy frosting, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of the compressor in the defrosting process is reduced, and the system reliability and comfort are improved.
In correspondence with the above-described embodiments, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the air conditioning system described above.
According to the computer readable storage medium of the embodiment of the invention, by executing the control method of the air conditioning system, the evaporation temperatures required by the cold accumulator and the indoor unit can be separated, the cold accumulator does not influence the normal refrigeration operation of the indoor unit at all, the system operation cost is saved, the output capacity of the refrigeration system in the peak period is improved, the cold accumulator can be used as a heat accumulator in the season easy to frost, the heat required by partial defrosting is solved, the defrosting speed is accelerated, the liquid return of a compressor during defrosting is reduced, and the reliability and the comfort of the system are improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (18)
1. An air conditioning system is characterized by comprising an outdoor unit and at least one indoor unit, wherein the outdoor unit is connected with each indoor unit through a high-pressure air pipe, a low-pressure air pipe and a liquid pipe, the outdoor unit comprises a compressor, an outdoor heat exchanger, a first throttling device, a pressure adjusting module and a cold accumulation module, wherein,
the pressure adjusting module comprises a second four-way valve, a one-way valve and a second throttling device, wherein the first end of the second four-way valve is connected with the high-pressure air pipe, the second end of the second four-way valve is connected with the air return port of the compressor, the third end of the second four-way valve is connected with the low-pressure air pipe through the one-way valve, and the fourth end of the second four-way valve is connected with the low-pressure air pipe through the second throttling device;
the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, wherein the first end of the cold accumulator is connected with the outdoor heat exchanger through the cold accumulation throttling device, the second end of the cold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is connected with the high-pressure liquid pipe through the second control valve.
2. The air conditioning system of claim 1, wherein the air conditioning system has a cold storage mode, wherein,
in the cold accumulation mode, the outdoor unit is controlled to perform refrigeration operation, the first throttling device is controlled to be opened, the cold accumulation throttling device is opened, the first control valve is opened, the second control valve is closed, the first end of the second four-way valve is communicated with the third end, the second end of the second four-way valve is communicated with the fourth end, and the opening degree of the second throttling device is adjusted according to the evaporation pressure of the indoor unit.
3. The air conditioning system of claim 1, wherein the air conditioning system has a cold storage utilization mode, wherein,
in the cold accumulation utilization mode, the outdoor unit is controlled to perform refrigeration operation, the first throttling device is controlled to be closed, the cold accumulation throttling device is opened, the first control valve is closed, the second control valve is opened, the first end and the fourth end of the second four-way valve are controlled to be communicated, the second end and the third end of the second four-way valve are controlled to be communicated, and the second throttling device is closed.
4. The air conditioning system of claim 1, wherein the air conditioning system has a heat storage mode, wherein,
in the heat storage mode, the outdoor unit is controlled to perform heating operation, the first throttling device is controlled to be opened, the cold storage throttling device is opened, the first control valve is opened, the second control valve is closed, the first end and the fourth end of the second four-way valve are controlled to be communicated, the second end and the third end of the second four-way valve are controlled to be communicated, and the second throttling device is closed.
5. The air conditioning system of claim 1, wherein the air conditioning system has a first defrost mode, wherein,
in the first defrosting mode, the outdoor unit is controlled to perform refrigerating operation, the first throttling device is controlled to be closed, the cold accumulation throttling device is opened, the first control valve is opened, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be closed.
6. The air conditioning system of claim 1, wherein the air conditioning system has a second defrost mode, wherein,
in the second defrosting mode, the outdoor unit is controlled to perform refrigerating operation, the first throttling device is controlled to be opened, the cold accumulation throttling device is closed, the first control valve is closed, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be opened.
7. The air conditioning system of claim 1, wherein the air conditioning system has a continuous hot defrost mode, wherein,
and in the non-stop heating defrosting mode, the outdoor unit is controlled to perform refrigerating operation, the first throttling device is controlled to be opened, the cold accumulation throttling device is opened, the first control valve is opened, the second control valve is closed, the first end of the second four-way valve is controlled to be communicated with the third end, the second end of the second four-way valve is controlled to be communicated with the fourth end, and the second throttling device is controlled to be closed.
8. A control method of an air conditioning system as claimed in any one of claims 1 to 7, characterized by comprising the steps of:
if the outdoor unit is determined to perform refrigeration operation, acquiring operation parameters of the compressor and cold accumulation time of the air conditioning system in a cold accumulation mode;
and controlling the operation mode of the air conditioning system according to the operation parameters of the compressor and the cold accumulation time.
9. The control method of an air conditioning system as claimed in claim 8, wherein the operation parameters of the compressor include an operation frequency, a discharge pressure and a current of the compressor, and the controlling of the operation mode of the air conditioning system according to the operation parameters of the compressor and the cold storage time includes:
and determining that the operating frequency of the compressor is continuously smaller than a first frequency threshold value within a first time threshold value, the exhaust pressure of the compressor is continuously smaller than a first pressure threshold value within the first time threshold value, the current of the compressor is continuously smaller than a first current threshold value within the first time threshold value, and the cold accumulation time is smaller than a second time threshold value, and controlling the air conditioning system to enter the cold accumulation mode.
10. The control method of an air conditioning system according to claim 9, further comprising:
if the exhaust pressure of the compressor is larger than a second pressure threshold value, or the current of the compressor is larger than a second current threshold value, or the compressor is stopped, the air-conditioning system is controlled to exit the cold accumulation mode;
and if the exhaust pressure of the compressor is determined to be less than or equal to the second pressure threshold, the current of the compressor is determined to be less than or equal to the second current threshold and the compressor is not stopped, the opening degree of the cold accumulation throttling device is obtained, and if the opening degree of the cold accumulation throttling device is determined to be continuously less than the first opening degree threshold within a third time threshold or the cold accumulation time is determined to be greater than a fourth time threshold, the air conditioning system is controlled to exit the cold accumulation mode.
11. The control method of an air conditioning system according to claim 9, wherein the controlling of the operation mode of the air conditioning system according to the operation parameter of the compressor and the cold storage time further comprises:
and determining that the operating frequency of the compressor is continuously greater than a second frequency threshold within a fifth time threshold, or the exhaust pressure of the compressor is continuously greater than a second pressure threshold within the fifth time threshold, or the current of the compressor is continuously greater than a second current threshold within the fifth time threshold, and the cold accumulation time is greater than a sixth time threshold, and controlling the air conditioning system to enter the cold accumulation utilization mode.
12. The control method of an air conditioning system according to claim 11, further comprising:
if the operating frequency of the compressor is determined to be smaller than a second frequency threshold value or the compressor is stopped, controlling the air-conditioning system to exit the cold accumulation utilization mode;
and if the operating frequency of the compressor is determined to be greater than or equal to a second frequency threshold value and the compressor is not stopped, acquiring the first end temperature and the second end temperature of the regenerator, and if the temperature difference between the second end temperature and the first end temperature of the regenerator is determined to be continuously smaller than the first temperature threshold value within a seventh time threshold value or the cold accumulation utilization time is determined to be greater than an eighth time threshold value, controlling the air-conditioning system to exit the cold accumulation utilization mode.
13. The control method of an air conditioning system according to claim 9 or 10, characterized by further comprising:
and if the air conditioning system is determined to enter the cold accumulation mode, adjusting the opening degree of the second throttling device according to the evaporation temperature of the indoor unit, controlling the operating frequency of the compressor according to the evaporation temperature of the cold accumulator, and controlling the opening degree of the cold accumulation throttling device according to the superheat degree of a refrigerant at the outlet of the cold accumulator.
14. The method of controlling an air conditioning system according to claim 13, wherein the adjusting the opening degree of the second throttling device according to the evaporating temperature of the indoor unit includes:
if the evaporation temperature of the indoor unit is determined to be less than or equal to a second temperature threshold value, the opening degree of the second throttling device is reduced;
and if the evaporation temperature of the indoor unit is determined to be greater than a third temperature threshold value, increasing the opening degree of the second throttling device, wherein the third temperature threshold value is greater than the second temperature threshold value.
15. The control method of an air conditioning system according to claim 13, wherein the controlling of the operating frequency of the compressor according to the evaporating temperature of the regenerator comprises:
if the evaporation temperature of the regenerator is determined to be greater than a fourth temperature threshold, the operating frequency of the compressor is increased;
and if the evaporation temperature of the cold accumulator is determined to be less than or equal to a fifth temperature threshold value, reducing the running frequency of the compressor, wherein the fourth temperature threshold value is greater than the fifth temperature threshold value.
16. The method as claimed in claim 13, wherein the controlling the opening degree of the cold storage throttling device according to the superheat degree of the cold storage outlet refrigerant comprises:
if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be larger than or equal to a first threshold value, the opening degree of the cold accumulation throttling device is increased;
and if the superheat degree of the refrigerant at the outlet of the cold accumulator is determined to be smaller than or equal to a second threshold value, reducing the opening degree of the cold accumulation throttling device, wherein the first threshold value is larger than the second threshold value.
17. The control method of an air conditioning system according to claim 13, further comprising:
and if the opening degree of the third throttling device of any indoor unit is determined to be larger than the third opening degree threshold value, the opening degree of the second throttling device is increased, and the running frequency of the compressor is increased.
18. A computer-readable storage medium, characterized in that a computer program is stored thereon, which when executed by a processor implements the control method of an air conditioning system according to any one of claims 8 to 17.
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