CN111351248B - Air conditioning system and control method - Google Patents

Air conditioning system and control method Download PDF

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Publication number
CN111351248B
CN111351248B CN202010179837.2A CN202010179837A CN111351248B CN 111351248 B CN111351248 B CN 111351248B CN 202010179837 A CN202010179837 A CN 202010179837A CN 111351248 B CN111351248 B CN 111351248B
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China
Prior art keywords
heat exchanger
conditioning system
air conditioning
outdoor
refrigerant
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CN202010179837.2A
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CN111351248A (en
Inventor
刘东来
史传民
贾东胜
王帅
杨春雪
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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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
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • 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
    • F24F11/42—Defrosting; Preventing freezing of outdoor 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/40—Pressure, e.g. wind pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioning system and a control method, relates to the technical field of air conditioning correlation, and aims to solve the problem that the user feels poorer when the user uses the existing air conditioning system due to large indoor temperature fluctuation during defrosting. The air conditioning system comprises a refrigerant main loop and an auxiliary loop, wherein the refrigerant main loop comprises a four-way valve, the first end of the four-way valve is communicated with an exhaust port of a compressor, the second end of the four-way valve is communicated with an indoor heat exchanger, the third end of the four-way valve is communicated with an air suction port of the compressor, the fourth end of the four-way valve is communicated with an outdoor heat exchanger, and a throttling device is arranged on a connecting pipeline of the indoor heat exchanger and the outdoor heat exchanger; the auxiliary loop comprises a heat storage device, a first control valve, a first heat exchanger and a water pump which are sequentially connected end to end, the first control valve is used for controlling the heat storage device to be communicated or disconnected with the first heat exchanger, the water pump can guide a heat storage medium into the first heat exchanger, and the first heat exchanger can exchange heat with an outdoor heat exchanger. The invention is used for refrigeration or heating.

Description

Air conditioning system and control method
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method.
Background
The air conditioning system comprises a refrigerant circulating channel, wherein the refrigerant circulating channel usually comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling device which are sequentially connected end to end, the refrigerant continuously circulates and flows in the refrigerant circulating system, so that state change occurs, heat exchange is carried out between the refrigerant and the outside, parameters such as indoor air temperature, relative humidity, air flow rate, working air cleanliness and the like are kept within a certain range, and a good living environment is provided for users.
When the air conditioning system operates under the conditions of low outdoor environment temperature and high humidity, the surface of an outdoor heat exchanger in the air conditioning system is easy to frost, when the surface of the outdoor heat exchanger frosts, the heat exchange capacity of the outdoor heat exchanger is reduced, and at the moment, the outdoor heat exchanger needs to be defrosted.
The prior art provides a multi-split defrosting control method and an air-conditioning multi-split system, wherein the multi-split defrosting control method is applied to the air-conditioning multi-split system, and the air-conditioning multi-split system comprises a plurality of indoor units. The defrosting control method of the multi-split air conditioner comprises the following steps: when a defrosting instruction is received, obtaining the accumulated running time of each indoor unit and the average running time of a plurality of indoor units; dividing the indoor units into common indoor units and target indoor units according to the accumulated running time and the average running time; and when the preset time is reached after the defrosting instruction is received, controlling the inner fan of the common indoor unit to be closed and controlling the inner fan of the target indoor unit to enter a high wind gear to operate until defrosting is finished. During defrosting, in addition to the compressor doing work to provide heat for defrosting, heat can be extracted from the indoor space correspondingly installed during high-wind-level operation of the target indoor unit to provide heat for defrosting.
The multi-split air conditioner defrosting control method and the multi-split air conditioner system have the following problems in use: because the target indoor unit can also absorb heat from the indoor space correspondingly installed in the high-wind-level operation process to provide heat energy for defrosting, and the target indoor unit is not an indoor unit which is never opened, if personnel move in the indoor space where the target indoor unit is located, the temperature fluctuation of the indoor space is large, and the use experience of a user is reduced.
Disclosure of Invention
The air conditioning system and the control method provided by the embodiment of the invention are used for solving the problem that the user feels poorer when the user uses the air conditioning system due to large indoor temperature fluctuation when the existing air conditioning system defrosts.
In order to achieve the purpose, the air conditioning system provided by the invention comprises a refrigerant main loop and an auxiliary loop, wherein the refrigerant main loop comprises a four-way valve, a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, wherein the first end of the four-way valve is communicated with an exhaust port of the compressor, the second end of the four-way valve is communicated with the indoor heat exchanger, the third end of the four-way valve is communicated with an air suction port of the compressor, the fourth end of the four-way valve is communicated with the outdoor heat exchanger, and the throttling device is arranged on a connecting pipeline of the indoor heat exchanger and the outdoor heat exchanger; the auxiliary loop comprises a heat storage device, a first control valve, a first heat exchanger and a water pump which are sequentially connected end to end, wherein a heat storage medium is stored in the heat storage device, the first control valve is used for controlling the heat storage device to be communicated or disconnected with the first heat exchanger, the water pump can lead the heat storage medium into the first heat exchanger, and the first heat exchanger is arranged on one side of the outdoor heat exchanger and can be used for exchanging heat with the outdoor heat exchanger.
Compared with the prior art, when the air-conditioning system provided by the invention is defrosted, the air-conditioning system is in a heating mode, the coil of the four-way valve is electrified, and the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor can be introduced into the indoor heat exchanger, and then flows into the outdoor heat exchanger after being throttled by the throttling device, and returns to the compressor again from the air suction port of the compressor, at the moment, the first control valve and the water pump are controlled to be opened, the heat storage medium stored in the heat storage device flows into the first heat exchanger under the driving of the water pump, the heat storage medium in the first heat exchanger can provide heat for the outdoor heat exchanger, so that the temperature of the surface of the outdoor heat exchanger is increased, the defrosting efficiency of the outdoor heat exchanger is improved, therefore, the problems that the heat exchange efficiency of the indoor heat exchanger is reduced due to low defrosting efficiency and the indoor temperature fluctuation is large can be avoided, and the use experience of a user is improved.
On the other hand, the invention also provides a control method of the air conditioning system, which is applied to the air conditioning system and comprises the following steps: acquiring a current working mode of the air conditioning system; and when the air conditioning system is in a heating mode at present and meets the defrosting condition, controlling the throttling device, the first control valve and the water pump to be opened.
Compared with the prior art, when the air conditioning system in the embodiment of the invention is in a heating mode and meets the defrosting condition, the frosting of the surface of the outdoor heat exchanger in the air conditioning system is shown, the first control valve and the water pump are controlled to be opened at the moment, the heat storage medium stored in the heat storage device flows into the first heat exchanger under the driving of the water pump, and the heat storage medium in the first heat exchanger can provide heat for the outdoor heat exchanger, so that the temperature of the surface of the outdoor heat exchanger is increased, the defrosting efficiency of the outdoor heat exchanger is improved, the problems of reduction of the heat exchange efficiency of the indoor heat exchanger and large indoor temperature fluctuation caused by low defrosting efficiency can be avoided, and the use experience of a user is improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a control flowchart of the air conditioning system in the heating mode and meeting the defrosting condition in the embodiment of the present invention;
FIG. 3 is a control flowchart illustrating the operation of adjusting the opening of the outdoor throttling device in the parallel branch according to the superheat of the refrigerant and the preset superheat when the air conditioning system is in the heating mode according to the embodiment of the present invention;
fig. 4 is a control flowchart of the air conditioning system in the heating mode according to the embodiment of the present invention, and when the first heating condition is satisfied;
FIG. 5 is a flowchart illustrating the control of the water pump according to the suction pressure and the preset discharge pressure when the air conditioning system is in the heating mode according to the embodiment of the present invention;
fig. 6 is a control flowchart of the air conditioning system in the heating mode according to the embodiment of the present invention, when the second heating condition is satisfied;
fig. 7 is a control flowchart of the air conditioning system in the cooling mode and when the first cooling condition is satisfied according to the embodiment of the present invention;
FIG. 8 is a flow chart illustrating the control of the water pump according to the discharge pressure and the first predetermined suction pressure when the air conditioning system is in the cooling mode according to an embodiment of the present invention;
fig. 9 is a control flowchart of adjusting the opening degree of the outdoor throttling device on the parallel branch according to the supercooling degree of the refrigerant and the preset supercooling degree when the air conditioning system in the embodiment of the present invention is in the cooling mode;
fig. 10 is a control flowchart of the air conditioning system in the cooling mode according to the embodiment of the present invention, when the second cooling condition is satisfied.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As is well known, when an air conditioning system is in a heating mode, a four-way valve is energized, a high-temperature and high-pressure refrigerant discharged from an exhaust port of a compressor flows into an indoor heat exchanger through the four-way valve, is condensed and releases heat in the indoor heat exchanger to increase the indoor temperature, then flows into an outdoor heat exchanger after being throttled by a throttling device to absorb heat and evaporate, and then returns to an air suction port of the compressor, thereby completing a heating cycle. When the air conditioning system is in a refrigeration mode, the four-way valve is powered off, high-temperature and high-pressure refrigerant discharged from an exhaust port of the compressor flows into the outdoor heat exchanger through the four-way valve, after being condensed and released in the outdoor heat exchanger, flows into the indoor heat exchanger after being throttled by the throttling device, absorbs heat from the indoor space, evaporates and returns to an air suction port of the compressor, and therefore a refrigeration cycle is completed.
Referring to fig. 1, an air conditioning system provided by an embodiment of the present invention includes a refrigerant main loop and an auxiliary loop, the refrigerant main loop includes a four-way valve 1, a compressor 2, an indoor heat exchanger 3, a throttling device 4 and an outdoor heat exchanger 5, wherein a first end of the four-way valve 1 is communicated with an exhaust port of the compressor 2, a second end of the four-way valve 1 is communicated with the indoor heat exchanger 3, a third end of the four-way valve 1 is communicated with an air suction port of the compressor 2, a fourth end of the four-way valve 1 is communicated with the outdoor heat exchanger 5, and a throttling device 4 is arranged on a connecting pipeline of the indoor heat exchanger 3 and the outdoor heat exchanger 5; the auxiliary loop comprises a heat storage device 6, a first control valve 7, a first heat exchanger 8 and a water pump 9 which are sequentially connected end to end, a heat storage medium is stored in the heat storage device 6, the first control valve 7 is used for controlling the heat storage device 6 to be communicated with or disconnected from the first heat exchanger 8, the water pump 9 can guide the heat storage medium into the first heat exchanger 8, and the first heat exchanger 8 is arranged on one side of the outdoor heat exchanger 5 and can exchange heat with the outdoor heat exchanger 5.
Compared with the prior art, when the air conditioning system provided by the invention is defrosted, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 2 sequentially flows through the indoor heat exchanger 3, the throttling device 4 and the indoor heat exchanger 3 and returns to the compressor 2 again from the air suction port of the compressor 2, and the first control valve 7 is controlled to be opened, at the moment, the heat storage medium stored in the heat storage device 6 flows into the first heat exchanger 8 under the driving of the water pump 9, the heat storage medium in the first heat exchanger 8 can provide heat for the outdoor heat exchanger 5, so that the temperature of the surface of the outdoor heat exchanger 5 is increased, the defrosting efficiency of the outdoor heat exchanger 5 is improved, the problems of reduction of the heat exchange efficiency of the indoor heat exchanger 5 and large indoor temperature fluctuation caused by low defrosting efficiency can be avoided, and the use experience of a user is improved.
Furthermore, the auxiliary loop also comprises a cold accumulation device 10, the cold accumulation device 10 is connected in parallel at two ends of the heat accumulation device 6, and a cold accumulation medium is stored in the cold accumulation device 10; the second control valve 11, the second control valve 11 is connected in series with the cold accumulation device 10, and is connected in parallel with the heat storage device 6, the second control valve 11 is used for controlling the connection or disconnection of the cold accumulation device 10 and the first heat exchanger 8, the water pump 9 can guide the cold accumulation medium into the first heat exchanger 8, the cold accumulation medium stored in the cold accumulation device 10 flows into the first heat exchanger 8 under the driving of the water pump 9, the heat exchange is carried out between the cold accumulation medium in the first heat exchanger 8 and the refrigerant in the outdoor heat exchanger 5 arranged on one side of the first heat exchanger 8, so that the refrigerant flowing out of the refrigerant outlet end of the outdoor heat exchanger 5 has higher supercooling degree, the temperature of the refrigerant flowing into the indoor heat exchanger 3 is lower, and the refrigeration effect of the air conditioning system is improved.
It should be noted that: the heat storage medium and the cold storage medium are both water (an antiscaling agent and an antifreezing agent are added in the water, so that the water can be prevented from freezing when the temperature is lower, meanwhile, the heat transfer efficiency is prevented from being influenced due to more scale in a pipeline after long-time use) or any one of heat conduction oil, the heat supply amount of the heat storage medium in the heat storage device 6 can be realized through external waste gas or waste water waste heat, the heat absorption and storage processes are finished, and the cold supply amount of the cold storage medium in the cold storage device 10 can be realized through air conditioner condensate water, rainwater or underground water, so that the heat dissipation and cold storage processes are finished.
Optionally, the air conditioning system further includes: the heating device is connected with the heat storage device 6 and used for providing heat for the heat storage device 6, so that the temperature of a heat storage medium in the heat storage device 6 is increased, the defrosting speed of the outdoor heat exchanger 5 in the air conditioning system is accelerated, or the heat storage medium is heated under the condition that the heat supply amount of the heat storage medium is insufficient, the heat storage medium is ensured to have proper temperature, and the reliability of defrosting the surface of the outdoor heat exchanger 5 is improved.
Optionally, the heating device is a solar heating device, and the solar heating device is adopted, so that the energy consumption of the air conditioning system is reduced. Optionally, the heating device is an electric energy heating device, and the electric energy heating device has high heating efficiency and is not affected by the external environment.
Further, the outdoor heat exchangers 5 comprise at least two outdoor heat exchangers 5, the outdoor heat exchangers 5 are connected in parallel, at least one first heat exchange 8 is arranged between every two adjacent outdoor heat exchangers 5, and compared with the situation that at least one first heat exchanger 8 is arranged between two partially adjacent outdoor heat exchangers 5, each outdoor heat exchanger 5 is arranged adjacent to the first heat exchanger 8 in the former scheme, so that each outdoor heat exchanger 5 can exchange heat with the first heat exchanger 8, and the heat exchange efficiency between each outdoor heat exchanger 5 and the first heat exchanger 8 is high.
Optionally, the outdoor heat exchanger 5 and the first heat exchanger 8 are attached to each other, so that a gap between the outdoor heat exchanger 5 and the first heat exchanger 8 can be reduced, and further, loss of heat or cold between the outdoor heat exchanger 5 and the first heat exchanger 8 is reduced, and heat exchange efficiency between each outdoor heat exchanger 5 and the first heat exchanger 8 is improved.
Further, the air conditioning system further comprises electromagnetic valves 12, one end of each parallel branch of each outdoor heat exchanger 5, which is close to the four-way valve 1, is provided with the electromagnetic valve 12, and the electromagnetic valves 12 are used for communicating or disconnecting the outdoor heat exchangers 5 and the four-way valve 1, when the air conditioning system is in an extreme working condition, for example, the air conditioning system is in a high-temperature heating working condition, the number of the outdoor heat exchangers 5 working in the air conditioning system is reduced by controlling part of the electromagnetic valves 12 to be closed, so that the phenomenon that the exhaust pressure of the compressor 2 in the air conditioning system is too high, which causes frequent high-pressure protection of the air conditioning system, and is beneficial to improving the operation reliability of the air conditioning system.
Further, the air conditioning system further comprises an outdoor throttling device 13, one end of each parallel branch of each outdoor heat exchanger 5, which is close to the throttling device 4, is provided with the outdoor throttling device 13, and the outdoor throttling device 13 can adjust the flow of the refrigerant flowing out of the outdoor throttling device 13, so that the flow of the refrigerant of each outdoor heat exchanger 5 is more matched with the current operation condition of the air conditioning system, and the heat exchange efficiency of the air conditioning system is further improved.
Based on the above embodiment, when the air conditioning system performs refrigeration under the condition of low outdoor environment temperature, the air conditioning system is very easy to enter anti-freezing protection (the anti-freezing protection is to prevent the evaporation temperature of the outdoor heat exchanger 5 of the air conditioning system from being low, which causes the liquid refrigerant to enter the compressor 2 and damage the compressor 2), and by closing the control electromagnetic valve 12 and the outdoor throttling device 13 correspondingly arranged, part of the outdoor heat exchanger 5 stops working, so that the heat exchange capacity of the outdoor heat exchanger 5 is reduced, and the refrigerant flow in the air conditioning system, the phenomenon that the air conditioning system is frequently started and stopped is avoided, and the air conditioning system can normally operate.
In addition, when the air conditioning system heats under the condition of high outdoor environment temperature, the air conditioning system is very easy to enter high-pressure protection (the high-pressure protection generally means that when the exhaust pressure of the compressor is higher than 3.5MPA, a pressure switch in the air conditioning system acts to prevent the compressor from being damaged or a pipeline from bursting due to excessive refrigerant in the air conditioning system) and the air conditioning system is closed through the control electromagnetic valve 12 and the outdoor throttling device 13 which is correspondingly arranged, so that the heat exchange capacity of the outdoor heat exchanger 5 and the refrigerant circulation amount in the air conditioning system can be reduced, and the air conditioning system can stably run.
In some embodiments of the present application, the outdoor heat exchangers 5 in the air conditioning system include at least two, a plurality of outdoor heat exchangers 5 are connected in parallel, and at least one first heat exchanger 8 is disposed between every two adjacent outdoor heat exchangers 5; the outdoor heat exchanger 5 and the first heat exchanger 8 are mutually attached; the electromagnetic valve 12 is arranged at one end, close to the four-way valve 1, of a parallel branch of each outdoor heat exchanger 5, and the electromagnetic valve 12 is used for communicating or disconnecting the outdoor heat exchanger 5 and the four-way valve 1; and an outdoor throttling device 13 is arranged at one end of each parallel branch of each outdoor heat exchanger 5 close to the throttling device 4, and the outdoor throttling device 13 can adjust the flow of the refrigerant flowing out of the outdoor throttling device 13.
When some outdoor heat exchangers 5 among the plurality of outdoor heat exchangers 5 are frosted, the electromagnetic valve 12 and the outdoor throttling device 13 on the parallel branch where the frosted outdoor heat exchangers 5 are located are closed. On one hand, the first heat exchanger 8 can provide heat for the frosted outdoor heat exchanger 5 so as to realize defrosting operation of the frosted outdoor heat exchanger 5; on the other hand, the first heat exchanger 8 can provide heat for the rest of the outdoor heat exchangers 5 (i.e. the outdoor heat exchangers 5 that are not frosted), so that the problems that the refrigerant flow in the air conditioning system is reduced and the heat exchange amount of the outdoor heat exchanger 5 is reduced due to the fact that the refrigerant in the parallel branch where the frosted outdoor heat exchanger 5 is located is sealed in the pipeline between the electromagnetic valve 12 and the outdoor throttling device 13 on the parallel branch can be solved, and the heating effect of the air conditioning system can be further ensured.
Further, the indoor heat exchangers 3 comprise at least two indoor heat exchangers 3, the indoor heat exchangers 3 are connected in parallel, one end, far away from the four-way valve 1, of each parallel branch of each indoor heat exchanger 3 is provided with the throttling device 4, therefore, when the air conditioning system is in a refrigeration working condition, the refrigerant flow in the indoor heat exchangers 3 can be controlled through the throttling devices 4 respectively, the refrigerant flow in each indoor heat exchanger 3 in the air conditioning system is matched with the current operation working condition of the air conditioning system, and the refrigeration effect of the air conditioning system is improved.
In some embodiments, the air conditioning system comprises a throttling device 4 and an outdoor throttling device 13, wherein a plurality of indoor heat exchangers 3 are connected in parallel, a plurality of outdoor heat exchangers 5 are connected in parallel, and a plurality of outdoor heat exchangers 5 are connected in parallel. At this time, if the air conditioning system is in a heating mode, high-temperature and high-pressure refrigerants discharged by the compressor 2 respectively enter each indoor heat exchanger 3, the throttling device 4 is used for adjusting the flow of the refrigerants flowing through each indoor heat exchanger 3, and the outdoor throttling device 13 throttles the refrigerants flowing through the outdoor throttling device 13, so that the throttled refrigerants with relatively low pressure flow into the outdoor heat exchangers 5 on the parallel branch where the outdoor throttling device 13 is located; similarly, if the air conditioning system is in the heating mode, the high-temperature and high-pressure refrigerant discharged by the compressor 2 enters each outdoor heat exchanger 5, the outdoor throttling device 13 is used for adjusting the flow rate of the refrigerant flowing through each outdoor heat exchanger 5, and the throttling device 4 throttles the refrigerant flowing through the throttling device 4, so that the refrigerant with relatively low pressure after throttling flows into the indoor heat exchangers 3 on the parallel branch where the throttling device 4 is located.
It should be noted that: the throttle device 4 and the outdoor throttle device 13 are electronic expansion valves. The outdoor heat exchanger 5, the indoor heat exchanger 3 and the first heat exchanger 8 may be any one of an L-type heat exchanger, a U-type heat exchanger, an M-type heat exchanger, a C-type heat exchanger or a C + L-type heat exchanger. Of course, the outdoor heat exchanger 5, the indoor heat exchanger 3, and the first heat exchanger 8 may be a cross-flow heat exchanger and a non-cross-flow heat exchanger. The description will be given by taking the outdoor heat exchanger 5 as a cross-flow heat exchanger, that is, the refrigerant flows through one outdoor heat exchanger 5 of the plurality of outdoor heat exchangers 5 and also flows through the other outdoor heat exchangers 5 except the outdoor heat exchanger 5, and the description will be given by taking the outdoor heat exchanger 5 as a non-cross-flow heat exchanger, that is, the refrigerant does not flow through the other outdoor heat exchangers 5 except the outdoor heat exchanger 5 if it flows through one outdoor heat exchanger 5 of the plurality of outdoor heat exchangers 5.
Further, the air conditioning system further comprises a fan 14, the outdoor heat exchangers 5 are arranged in parallel at intervals, and airflow generated by the fan 14 sequentially flows through the outdoor heat exchangers 5; the motor is used for driving the fan 14 to rotate clockwise or anticlockwise, the flowing direction of the air flow generated by the fan can be controlled through the rotating direction of the motor, namely the air flow generated by the fan flows from the outdoor heat exchanger 5 close to the fan to the outdoor heat exchanger 5 far away from the fan or flows from the outdoor heat exchanger 5 far away from the fan to the outdoor heat exchanger 5 close to the fan, when the air flow generated by the fan flows through the outdoor heat exchanger 5, the heat exchange efficiency between the outdoor heat exchanger 5 and the ambient air can be accelerated, and therefore the heat exchange efficiency of the outdoor heat exchanger 5 is improved.
In order to improve the energy consumption of the air conditioning system and avoid the situation that the heating device still supplies heat to the heat storage device 6 under the condition that the temperature of the heat storage medium in the heat storage device 6 is high, so that the heating device consumes unnecessary energy, the air conditioning system also comprises a first temperature sensor, and the first temperature sensor is used for detecting the temperature of the heat storage medium in the heat storage device 6; the controller, heating device, first temperature sensor all are connected with the controller electricity, and the controller includes control module, and control module can select to open or close heating device according to the temperature of the heat accumulation medium that first temperature sensor detected.
Optionally, the air conditioning system preferably includes a first pressure sensor, the first pressure sensor is used for detecting the suction pressure of the compressor 2, the first pressure sensor and the water pump 9 are both electrically connected to the controller, when the four-way valve 1 guides the refrigerant discharged from the air outlet of the compressor 2 into the indoor heat exchanger 3, that is, the air conditioning system is in the heating mode, the control module can adjust the rotating speed of the water pump 9 according to the suction pressure detected by the first pressure sensor, so as to adjust the heat exchange amount between the first heat exchanger 8 and the outdoor heat exchanger 5, so that the heat exchange efficiency between the first heat exchanger 8 and the outdoor heat exchanger 5 is more matched with the current operating condition of the air conditioning system, and thus the energy consumption is reduced.
Further, the air conditioning system further includes a second temperature sensor, a refrigerant port of each outdoor heat exchanger 5 close to the electromagnetic valve 12 is provided with the second temperature sensor, the second temperature sensors are respectively used for detecting the refrigerant temperature at the refrigerant port of the outdoor heat exchanger 5 on the branch where the second temperature sensor is located, the second temperature sensors are electrically connected with the controller, and the controller further includes: and the calculation module can calculate the superheat degree of the refrigerant of the outdoor heat exchanger 5 according to the refrigerant temperature detected by the second temperature sensor and the refrigerant saturation temperature corresponding to the suction pressure detected by the first pressure sensor, so that the opening degree of the outdoor throttling device 13 on the parallel branch is adjusted according to the calculated superheat degree of the refrigerant on the branch, and the refrigerant superheat degree can accurately reflect the refrigerant temperature flowing out of the outdoor heat exchanger 5 and the refrigerant saturation temperature corresponding to the current suction pressure of the compressor 2, so that the refrigerant flow on the parallel branch is adjusted according to the refrigerant superheat degree, and the refrigerant flow flowing through the outdoor heat exchanger 5 on the parallel branch can be more accurately controlled.
Similarly, the air conditioning system further comprises a second pressure sensor, the second pressure sensor is used for detecting the exhaust pressure of the compressor 2, the second pressure sensor is electrically connected with the controller, when the four-way valve 1 guides the refrigerant discharged from the air outlet of the compressor into the outdoor heat exchanger 5, namely, when the air conditioning system is in a refrigeration mode, the control module can adjust the rotating speed of the water pump according to the exhaust pressure detected by the second pressure sensor, so that the heat exchange efficiency between the first heat exchanger 8 and the outdoor heat exchanger 5 is more matched with the current operation working condition of the air conditioning system.
Further, the air conditioning system further comprises a third temperature sensor, a refrigerant port of each outdoor heat exchanger 5, which is close to the four-way valve 1, is provided with the third temperature sensor, and the third temperature sensor is used for detecting the refrigerant temperature at the refrigerant port of the outdoor heat exchanger 5 on the branch in which the third temperature sensor is located; the calculation module can calculate the refrigerant supercooling degree of the outdoor heat exchanger 5 according to the refrigerant temperature detected by the third temperature sensor and the refrigerant saturation temperature corresponding to the exhaust pressure detected by the second pressure sensor, and can adjust the refrigerant flow on the parallel branch according to the refrigerant supercooling degree, so that the refrigerant flow passing through the indoor heat exchanger 3 on the parallel branch can be more accurately controlled.
Optionally, the air conditioning system in the embodiment of the present invention further includes a gas-liquid separator 15, the gas-liquid separator 15 is connected to a connecting pipe between the outdoor heat exchanger 5 and the compressor 2, an air inlet of the gas-liquid separator 15 is communicated with an outlet of the outdoor heat exchanger 5, and an air outlet of the gas-liquid separator 15 is communicated with an air suction port of the compressor 2. In the operation process of the air conditioning system, the gas-liquid separator 15 can not only perform the gas-liquid separation function on the refrigerant in the gas-liquid two-phase state discharged by the outdoor heat exchanger 5 to prevent the compressor 2 from sucking gas and carrying liquid, but also buffer the pressure of the refrigerant by setting the gas-liquid separator 15 compared with the condition that the refrigerant discharged by the outdoor heat exchanger 5 directly returns to the suction port of the compressor 2, thereby ensuring the stable suction pressure of the compressor 2 and the safe and reliable operation.
The embodiment of the invention also provides an air conditioner which comprises the air conditioning system, and the air conditioner with the air conditioning system can also realize the same technical effect because the air conditioner adopts the air conditioning system.
Based on the above embodiment, the above air conditioner includes the outdoor unit 100, the indoor unit 200, and the auxiliary unit 300, the four-way valve 1, the compressor 2, the outdoor heat exchanger 5, the electromagnetic valve 12, the outdoor throttling device 13, and the first heat exchanger 8 are provided in the outdoor unit 100, the indoor heat exchanger 3 and the throttling device 4 are provided in the indoor unit 200, and the heat storage device 6, the first control valve 7, the cold storage device 10, the second control valve 11, and the water pump 9 are provided in the auxiliary unit 300.
Referring to fig. 2, an embodiment of the present invention further provides a control method of an air conditioning system, where the control method of the air conditioning system includes the following steps: acquiring a current working mode of an air conditioning system; when the air conditioning system is in a heating mode at present and meets the defrosting condition, the throttling device, the first control valve and the water pump are controlled to be opened. The above-described operation of controlling the first control valve and the water pump to be opened may be performed by a control module in a main controller in the air conditioning system, or may be performed by a specially-provided sub-controller in the air conditioning system.
Compared with the prior art, when the air conditioning system in the embodiment of the invention is in a heating mode and meets the defrosting condition, the frosting of the surface of the outdoor heat exchanger in the air conditioning system is shown, the first control valve and the water pump are controlled to be opened at the moment, the heat storage medium stored in the heat storage device flows into the first heat exchanger under the driving of the water pump, and the heat storage medium in the first heat exchanger can provide heat for the outdoor heat exchanger, so that the temperature of the surface of the outdoor heat exchanger is increased, the defrosting efficiency of the outdoor heat exchanger is improved, the problems of reduction of the heat exchange efficiency of the indoor heat exchanger and large indoor temperature fluctuation caused by low defrosting efficiency can be avoided, and the use experience of a user is improved.
Wherein, the defrosting conditions are as follows: outdoor ambient temperature TaoIs lower than a third preset heating temperature T'aor3And the accumulated running time t of the air conditioning system after the last defrosting is finishedjGreater than or equal to preset defrosting accumulated running time t'j1The air conditioning system exits abnormally in the last defrosting process and the heat supply quantity Q of the heat storage devicerGreater than or equal to a first preset heating quantity Q'r1. Or the defrosting conditions are as follows: defrost temperature T for outdoor heat exchangercReaches a first preset defrosting temperature T'c1And continues for a first preset defrosting time t'c1And heat supply QrGreater than or equal to a first preset heating quantity Q'r1Wherein, the defrosting temperature is the temperature at the U-shaped elbow in the outdoor heat exchanger, and when the air conditioning system operates in heating, the temperature at the U-shaped elbow in the outdoor heat exchanger is usually the lowest temperature point of the whole outdoor heat exchanger, namely the heat exchange of the outdoor heat exchanger is the highestIn a poor place, when the air conditioning system meets the above defrosting condition, it indicates that the surface of the outdoor heat exchanger is frosted, and at this time, the outdoor heat exchanger needs to be defrosted.
In addition, the controller also comprises a timing module, and the timing module is used for recording the accumulated running time t of the air conditioning system after the last defrosting is finishedj(ii) a The air conditioning system comprises a fourth temperature sensor which is used for detecting the outdoor environment temperature Tao(ii) a The air conditioning system comprises a fifth temperature sensor, and the fifth temperature sensor is used for detecting the defrosting temperature T of the outdoor heat exchangercI.e. the temperature at the U-bend in the outdoor heat exchanger; the air conditioning system comprises a first temperature sensor, the first temperature sensor is used for detecting the temperature change value of the heat storage medium, the controller also comprises a calculation module, and the calculation module is used for calculating the current heat supply quantity Q of the heat storage device by substituting the temperature change value into a heat formular(ii) a The timing module is also used for recording the defrosting temperature T of the outdoor heat exchangercReaches a first preset defrosting temperature T'c1Of the first preset defrost time t'c1(ii) a The controller further comprises a storage module, and the storage module is used for storing a third preset heating temperature T'aor3And preset defrosting accumulated running time t'j1And a first predetermined heat supply amount Q'r1And a first preset defrosting temperature T'c1And a first preset defrosting time t'c1。
Further, the air conditioning system comprises a heating device which is connected with the heat storage device and can provide heat for the heat storage medium; a first temperature sensor for detecting the temperature of a heat storage medium in the heat storage device; the controller, heating device, first temperature sensor all are connected with the controller electricity, and the controller includes: the control module can selectively turn on or off the heating device according to the temperature of the heat storage medium detected by the first temperature sensor; before controlling the throttling device, the first control valve and the water pump to be opened, the control method of the air conditioning system further comprises the following steps: obtain the current heat supply Q of the heat storage devicer(ii) a If the current heat supply is presentQuantity QrGreater than first preset heat supply quantity Q'r1If so, executing the step of controlling the throttle device, the first control valve and the water pump to be opened; if the current heat supply QrIs less than or equal to a first preset heating quantity Q'r1And controlling the heating device to be opened, and then executing the step of controlling the throttling device, the first control valve and the water pump to be opened.
If the current heat supply quantity Q of the heat storage medium in the heat storage devicerGreater than first preset heat supply quantity Q'r1If the defrosting temperature is higher than the preset temperature, the heat stored in the heat storage device is larger, and enough heat can be provided for defrosting of the outdoor heat exchanger; if the current heat supply quantity Q of the heat storage medium in the heat storage devicerIs less than or equal to a first preset heat quantity Q'r1The heating load of the deposit among the heat storage device is shown to be less promptly, and the controller control heating device opens and heats the heat accumulation medium this moment, guarantees that the heating load of deposit is more in the heat storage device to can guarantee that outdoor heat exchanger's defrosting efficiency is higher, can also avoid causing the great condition of indoor temperature fluctuation when defrosting outdoor heat exchanger.
Further, the air conditioning system also comprises at least a plurality of outdoor heat exchangers, and the outdoor heat exchangers are mutually connected in parallel; the fan is arranged in parallel at intervals, and airflow generated by the fan sequentially flows through the outdoor heat exchangers; the motor is used for driving the fan to rotate clockwise or anticlockwise, the air-conditioning system also comprises electromagnetic valves, one end of each parallel branch of each outdoor heat exchanger, which is close to the four-way valve, is provided with the electromagnetic valve, and the electromagnetic valves are used for communicating or disconnecting the outdoor heat exchangers and the four-way valve; the outdoor throttling device is arranged at one end, close to the throttling device, of each parallel branch of each outdoor heat exchanger, the outdoor throttling device can adjust the flow of the refrigerant flowing out of the outdoor throttling device, and after the throttling device, the first control valve and the water pump are controlled to be opened, the control method of the air conditioning system further comprises the following steps: the control electromagnetic valve and the outdoor throttling device are both opened; acquiring the current rotation direction of a motor; defrosting: the rotation direction of the control motor is adjusted to be the reverse direction of the current rotation direction so as to adjust the flowing direction of the air flow generated by the fan, and the outdoor heat exchanger through which the air flow passes first before the rotation direction of the control motor is adjusted is defrosted. All the electromagnetic valves and the outdoor throttling devices are electrically connected with the controller, and the opening adjustment of all the electromagnetic valves and the outdoor throttling devices is executed by a control module in the controller.
According to the embodiment of the invention, the current rotating direction of the motor is obtained, the flowing direction of the air flow generated by the fan is obtained, and the frosting on the surface of the outdoor heat exchanger on which side can occur is known. Normally, the air flow blown by the fan is blown from the outdoor heat exchanger far away from the fan to the outdoor heat exchanger close to the fan, i.e., the outdoor air passes through the outdoor heat exchanger far away from the fan, so that the moisture in the outdoor air is condensed and separated out, and frost is formed on the surface of the outdoor heat exchanger away from the fan, and when the outdoor air passes through the remaining outdoor heat exchangers again, the moisture in the air is greatly reduced, the frosting condition is not met, the rotating direction of the motor is controlled by the controller to be adjusted to be the reverse direction of the current rotating direction, the direction of the air flow generated by the fan is blown to the outdoor heat exchanger far away from the fan from the outdoor heat exchanger close to the fan, and the outdoor air with higher temperature after heat exchange through the first heat exchanger is blown to the outdoor heat exchanger far away from the fan, so that defrosting of the outdoor heat exchanger far away from the fan is realized.
Based on the above embodiment, after acquiring the current rotation direction of the motor, before the controlling the rotation direction of the motor is adjusted to be opposite to the current rotation direction, the control method of the air conditioning system further includes: according to the current rotation direction of the motor, the flowing direction of the air flow generated by the fan is obtained, and the electromagnetic valve and the outdoor throttling device on the parallel branch where the outdoor heat exchanger where the air flow passes through firstly are controlled to be closed, so that on one hand, the first heat exchanger can provide heat for the outdoor heat exchanger which is frosted, and the defrosting operation of the frosted outdoor heat exchanger is realized; on the other hand, the first heat exchanger can provide heat for the rest outdoor heat exchangers (namely, the outdoor heat exchangers which are not frosted), so that the problems that the flow of the refrigerant in the air conditioning system is reduced and the heat exchange amount of the outdoor heat exchangers is reduced due to the fact that the refrigerant in the parallel branch where the frosted outdoor heat exchanger is located is sealed in the pipeline between the electromagnetic valve and the outdoor throttling device on the parallel branch can be solved, and the heating effect of the air conditioning system can be further guaranteed.
Referring to fig. 2 to 3, the air conditioning system further includes a first pressure sensor for detecting a suction pressure P of the compressorsThe first pressure sensor and the water pump are electrically connected with the controller, and when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the indoor heat exchanger, the control module can detect the suction pressure P according to the first pressure sensorsAdjusting the rotating speed of the water pump; the refrigerant port department that every outdoor heat exchanger is close to the solenoid valve all is equipped with second temperature sensor, and second temperature sensor is used for detecting the refrigerant temperature at the refrigerant port department of the outdoor heat exchanger on its branch road of place respectively, and second temperature sensor is connected with the controller electricity, and the controller still includes: a calculation module capable of calculating a refrigerant temperature detected by the second temperature sensor and a suction pressure P detected by the first pressure sensorsCalculating the refrigerant superheat degree T of the outdoor heat exchanger according to the corresponding refrigerant saturation temperatureso(ii) a After the electromagnetic valve and the outdoor throttling device on the parallel branch where the outdoor heat exchanger where the control air flow passes first are closed, before the rotation direction of the motor is controlled to be adjusted to be the current reverse direction of the rotation direction, the control method of the air conditioning system further comprises the following steps: respectively obtaining the current superheat degree T of the refrigerant on the parallel branch where other outdoor heat exchangers except the outdoor heat exchanger through which the airflow passes firstly are positionedso(ii) a If the current degree of superheat T of the refrigerantsoIs greater than preset refrigerant superheat degree T'soIncreasing the opening degree of the outdoor throttling device on the parallel branch; if the current degree of superheat T of the refrigerantsoEqual to preset refrigerant superheat degree T'soThen the opening degree of the outdoor throttling device on the parallel branch is kept; if the current degree of superheat T of the refrigerantsoLess than preset refrigerant superheat degree T'soAnd then the opening degree of the outdoor throttling device on the parallel branch is reduced.
If others are as describedCurrent refrigerant superheat T on parallel branch of outdoor heat exchangersoIs greater than preset refrigerant superheat degree T'soThe controller controls the opening of the outdoor throttling device on the parallel branch to be increased, the flow of the refrigerant in the outdoor heat exchanger on the parallel branch where the outdoor throttling device is located is increased, more refrigerant is guaranteed to flow through the outdoor heat exchanger to absorb heat and evaporate, and the heat exchange efficiency of the outdoor heat exchanger is improved. On the contrary, if the current refrigerant superheat degree T is on the parallel branch circuit where the rest outdoor heat exchangers are positionedsoLess than preset refrigerant superheat degree T'soThat is, it indicates that the heat exchange capacity of the remaining outdoor heat exchangers is relatively weak, at this time, the controller controls the opening degree of the outdoor throttling device on the parallel branch to decrease, and decreases the flow rate of the refrigerant flowing through the outdoor heat exchangers on the parallel branch to ensure that the refrigerant at the refrigerant outlet of the outdoor heat exchanger on the parallel branch has a proper superheat degree, so that the refrigerant at the refrigerant outlet of each outdoor heat exchanger in the remaining outdoor heat exchangers has a proper superheat degree, and the refrigerant superheat degree T of the remaining outdoor heat exchangers is avoidedsoThe refrigerant superheat degree T is lower, the risk of air suction and liquid entrainment of the compressor is caused, the operation of the air conditioning system is safer and more reliable, and if the current refrigerant superheat degree T is highersoEqual to preset refrigerant superheat degree T'soIf the superheat degree of the refrigerant of the outdoor heat exchanger on the parallel branch is proper, the opening degree of the outdoor throttling device on the parallel branch is kept unchanged, and the superheat degree T of the refrigerant can be ensured through the adjustmentsoIs more and more close to the preset refrigerant superheat degree T'soThe negative influence caused by reduction of the heat exchange area of the outdoor heat exchanger due to the fact that the electromagnetic valve and the outdoor throttling device on the parallel branch of the outdoor heat exchanger through which the airflow passes firstly are closed is made up, and therefore the energy consumption of the air conditioning system is improved.
It should be noted that: because the heat exchange efficiency of the outdoor heat exchangers on each parallel branch is different, the heat exchange efficiency of each outdoor heat exchanger is usually obtained according to the flowing direction of the airflow, and the outdoor heat exchanger through which the airflow firstly flows has the highest heat exchange efficiency and then flows through the outdoor heat exchangerThe heat exchange effect of the other outdoor heat exchangers in the flowing direction of the airflow is reduced in sequence, so that in order to enable the heat exchange efficiency of each outdoor heat exchanger to be appropriate, the heat exchange efficiency of the air conditioning system is enabled to be more matched with the current operation working condition, the energy consumption of the air conditioning system is further improved, and the preset refrigerant superheat degree T 'of the refrigerant in the outdoor heat exchanger on each parallel branch is'soAll values of (A) are different.
Further, the air conditioning system further comprises a second pressure sensor for detecting the discharge pressure P of the compressordAfter the electromagnetic valve and the outdoor throttling device on the parallel branch where the outdoor heat exchanger where the control air flow passes first are closed, the control method of the air conditioning system further comprises the following steps: recording the defrosting accumulated time t of the outdoor heat exchanger through which the airflow passes firstkc(ii) a If the defrosting is performed for the accumulated time tkcIs more than or equal to a first preset time t'1Then the defrosting temperature T corresponding to the outdoor heat exchanger through which the air flow passes first is obtainedcAnd the current discharge pressure P of the compressord(ii) a The corresponding defrosting temperature T of the outdoor heat exchanger when the air flow passes through firstcGreater than or equal to preset defrosting temperature T'c2And lasts for a second preset time t'2Exhaust pressure PdGreater than or equal to preset exhaust pressure P'dOr the accumulated defrosting time tkcIs more than or equal to a third preset time t'3Meanwhile, the control electromagnetic valve and the outdoor throttling device are both opened, wherein the first preset time t'1Is less than a third preset time t'3. The second pressure sensor is installed at the air outlet of the compressor and used for detecting the exhaust pressure P of the compressordThe storage module is further used for storing preset defrosting temperature T'c2And preset exhaust pressure P'dAnd a first preset time t'1And a second preset time t'2And a third preset time t'3The timing module is also used for recording the defrosting accumulated time t of the air conditioning systemkcAnd the defrost temperature T of the outdoor heat exchanger through which the air flow first passescGreater than or equal to preset defrosting temperature T'c2Duration t of timekc。
Defrost temperature T of outdoor heat exchanger when airflow first passescGreater than or equal to preset defrosting temperature T'c2And lasts for a second preset time t'2Exhaust pressure PdGreater than or equal to preset exhaust pressure P'dOr the accumulated defrosting time tkcIs more than or equal to a third preset time t'3And when the frosting on the surface of the outdoor heat exchanger, which is passed by the airflow firstly before the rotation direction of the motor is adjusted, is cleared, the electromagnetic valve and the outdoor throttling device which are closed are controlled to be opened, so that the outdoor heat exchanger on the parallel branch is put into use again, and the heat exchange efficiency of the air-conditioning system is ensured.
Optionally, after the control solenoid valve and the outdoor throttling device are both opened, the method further comprises: obtaining the superheat degree T of the refrigerant of each outdoor heat exchangersoAnd suction pressure P of the compressorsAccording to the degree of superheat T of the refrigerantsoAnd preset refrigerant superheat degree T'soAdjusting the opening degree of the outdoor throttling device on the parallel branch according to the suction pressure P of the compressorsAnd a preset suction pressure P'sAnd the rotating speed of the motor is adjusted, so that the opening degree of the outdoor throttling device and the rotating speed of the motor are more matched with the current operating condition of the air conditioning system.
Optionally, after acquiring the current operating mode of the air conditioning system, the method further includes: recording the operating time t of an air conditioning systemoIf the operation time t of the air conditioning system isoIs more than or equal to the preset running time t 'of the air conditioning system'oReturning to the step of obtaining the current working mode of the air conditioning system, wherein the storage module is further used for storing preset running time t 'of the air conditioning system'oWherein the air conditioning system presets a running time t'oIs more than a first preset time t'1And a second preset time t'2Is simultaneously greater than a first preset time t'1And a second preset time t'3The timing module is also used for recording the running time t of the air conditioning systemoEach time a preset running time t 'of the air conditioning system passes'oThe air conditioning system will reacquire the above parameters to obtainThe obtained parameters are more matched with the current operation condition of the air conditioning system, and the control precision of the air conditioning system and the heat exchange efficiency of the air conditioning system are favorably improved.
Referring to fig. 4, after acquiring the current operating mode of the air conditioning system, the control method of the air conditioning system further includes: when the air conditioning system is in a heating mode currently and meets a first heating condition, controlling a first control valve and a water pump to be closed, controlling throttling devices to be opened, controlling an electromagnetic valve and an outdoor throttling device on a parallel branch where at least one outdoor heat exchanger is located to be closed, and controlling electromagnetic valves and outdoor throttling devices on parallel branches where the other outdoor heat exchangers are located to be opened; the first heating condition is as follows: the operating frequency f of the compressor is less than or equal to the minimum operating frequency fminThe rotating speed n of the fan is less than or equal to the lowest rotating speed nminAnd the outdoor ambient temperature TaoIs higher than a first preset heating temperature T'aor1(ii) a Or the first heating condition is: the times K of high-voltage protection of the air conditioning system are more than or equal to the preset high-voltage protection times K'. The controller further comprises a counting module, the counting module is used for recording the times K of high-voltage protection of the air conditioning system, and the storage module is further used for storing the minimum operating frequency fminMinimum rotational speed nminAnd a first preset heating temperature T'aor1And the preset high-voltage protection times K'.
When the air conditioning system is determined to be in a heating mode currently and meet a first heating condition, the air conditioning system is indicated to be in a high-temperature heating working condition, when the controller receives that the air conditioning system is in the high-temperature heating working condition, the controller can send a corresponding control instruction, control the first control valve and the water pump to be closed, control the throttling devices to be opened, control the electromagnetic valve on the parallel branch where the at least one outdoor heat exchanger is located and the outdoor throttling device to be closed, and control part of refrigerant in the air conditioning system to be stored in the outdoor heat exchanger on the parallel branch so as to reduce the refrigerant flow in the air conditioning system and the heat exchange area of the outdoor heat exchanger, so that the heat exchange capacity of the outdoor heat exchanger is reduced, and the phenomenon that the air conditioning system is frequently stopped due to high-pressure protection can be effectively avoided. In addition, to be betterThe rated cooling capacity of the indoor heat exchanger can be reduced, for example, if the rated cooling capacity of the indoor heat exchanger is 2800W, the rated cooling capacity of the indoor heat exchanger can be reduced to 1800W or less. Wherein the first preset heating temperature T'aor1Greater than third preset heating temperature T'aor3。
It should be noted that: the air conditioning system is in a high-temperature heating working condition, so as to avoid the condition that the air conditioning system has high-pressure protection when the indoor unit is turned on only, wherein the minimum operating frequency f of the compressorminRefers to the lowest frequency that the manufacturer drive can do, typically 15 hz. Lowest speed n of fan (outdoor fan)minMinimum rotational speed n of outdoor fanminIt may be 0rpm (revolutions per minute), but if the heat radiation method of the outdoor heat exchanger is an air-cooling heat radiation method, the minimum rotation speed n of the outdoor fanminCan not be 0rpm (revolution/minute), and the lowest rotating speed n of the outdoor fan at the momentminTypically 200 rpm.
Referring to fig. 4 to 5, after the first control valve and the water pump are controlled to be closed, the throttling devices are controlled to be opened, the electromagnetic valve and the outdoor throttling device on the parallel branch where at least one outdoor heat exchanger is located are controlled to be closed, and the electromagnetic valves and the outdoor throttling devices on the parallel branches where the other outdoor heat exchangers are located are controlled to be opened, the method further comprises the step of recording the closing time t of the electromagnetic valve or the outdoor throttling device on the parallel branch where the outdoor heat exchanger is locatedf(ii) a If closing time tfIs more than or equal to preset closing time t'fgAnd returning to the step of acquiring the current working mode of the air conditioning system. The storage module is also used for storing preset closing time t'fgThe timing module is also used for recording the closing time t of the electromagnetic valve and the outdoor throttling devicef. If closing time tfIs more than or equal to preset closing time t'fgAnd at the moment, the parameters are re-acquired, and the air conditioning system re-adjusts the air conditioning system according to the re-acquired parameters, so that the control precision of the air conditioning system is improved.
With continued reference to FIG. 4, after the current operating mode of the air conditioning system is obtained, the current operating mode is also obtainedThe method comprises the following steps: when the air conditioning system is currently in a heating mode and meets a first heating exit condition, the control electromagnetic valve and the outdoor throttling device are both opened, and the first heating exit condition is as follows: receiving a shutdown instruction, receiving a standby instruction and an outdoor environment temperature TaoIs lower than a fourth preset heating temperature T'aor4Or the air outlet temperature T of at least one indoor unitcfIs less than preset air outlet temperature T'cfWherein the fourth preset heating temperature T'aor4Is lower than a first preset heating temperature T'aor1. The storage module is further used for storing a fourth preset heating temperature T'aor4And preset air outlet temperature T'cfThe air conditioning system also comprises a sixth temperature sensor, at least one sixth temperature sensor is arranged at the air outlet of each indoor unit, the sixth temperature sensors are electrically connected with the controller, and the sixth temperature sensors detect the air outlet temperature T of the indoor unitcfFeeding back to the controller, wherein the controller outputs a plurality of outlet air temperatures TcfAnd preset air outlet temperature T'cfComparing, if there is at least one air-out temperature TcfIs less than preset air outlet temperature T'cfIf the current heating effect of the air-conditioning system is poor, the controller controls the electromagnetic valve and the outdoor throttling device to be opened, so that all the outdoor heat exchangers start to work, and the heat exchange efficiency of the air-conditioning system is ensured.
Further, after the controller controls the electromagnetic valve and the outdoor throttling device to be opened, the method further comprises the following steps: respectively obtaining the superheat degree T of the refrigerant at the refrigerant outlet of each outdoor heat exchangerso(ii) a According to the superheat degree T of the refrigerantsoAnd preset refrigerant superheat degree T'soRespectively adjusting the refrigerant flow in each outdoor heat exchanger to ensure that the refrigerant superheat degree T on each parallel branchsoRespectively approaching to preset refrigerant superheat degree T 'on each parallel branch'soFurther improving the heating effect of the air conditioning system. How to depend on the superheat degree T of the refrigerantsoRegulating refrigerant flow in outdoor heat exchanger and how to adjust refrigerant superheat TsoAnd preset refrigerant superheat degree T'soSeparately regulating refrigerant in each outdoor heat exchangerThe flow rate, which has been described in detail above, is not described herein.
Alternatively, the refrigerant superheat degree T at the refrigerant outlet of each outdoor heat exchanger is obtained separatelyso(ii) a According to the superheat degree T of the refrigerantsoAnd preset refrigerant superheat degree T'soAfter the refrigerant flow in each outdoor heat exchanger is respectively adjusted, the method further comprises the following steps: recording the operating time t of an air conditioning systemoIf the operation time t of the air conditioning system isoGreater than preset running time t 'of air conditioning system'oReturning to the step of obtaining the current working mode of the air conditioning system, and if the running time t of the air conditioning system is upoIs less than or equal to preset running time t 'of air conditioning system'oThen returning to respectively obtain the superheat degree T of the refrigerant at the refrigerant outlet of each outdoor heat exchangersoBased on the obtained refrigerant superheat degree TsoThe opening degree of the outdoor throttling device is adjusted, so that the opening degree of the outdoor throttling device is more matched with the current operation condition of the air conditioning system, and the heating effect of the air conditioning system is improved. The storage module is further used for storing preset running time t 'of the air conditioning system'o。
Referring to fig. 5 to 6, after acquiring the current operating mode of the air conditioning system, the method further includes: when the air conditioning system is in a heating mode and is in a second heating condition, the electromagnetic valve, the outdoor throttling device, the first control valve and the water pump are controlled to be opened; the second heating condition is as follows: heat supply Q provided by heat storage devicerGreater than second preset heating quantity Q'r2And the outdoor ambient temperature TaoIs lower than a second preset heating temperature T'aor2And the second preset heating temperature T'aor2Is lower than a first preset heating temperature T'aor1. The storage module is also used for storing preset heat storage running time t'rAnd a second predetermined heat supply amount Q'r2And a second preset heating temperature T'aor2When the air conditioning system is in the heating mode and is in the second heating condition, the heating load Q of the heat storage medium in the heat storage device indicates that the air conditioning system is currently in the normal heating working conditionrCan provide enough for the outdoor heat exchangerAnd the heat quantity controls the first control valve and the water pump to be opened at the moment, so that the first heat exchanger can provide heat for the outdoor heat exchanger, and the heating effect of the air-conditioning system is improved.
Further, after the control solenoid valve, the outdoor throttling device, the first control valve and the water pump are all opened, the method further comprises the following steps: recording the operating time t of the thermal storage devicer(ii) a If the operating time t of the heat storage devicerIs less than or equal to preset heat storage running time t'rThen the current suction pressure P of the compressor is obtaineds(ii) a If the current suction pressure PsGreater than preset suction pressure P'sReducing the rotating speed of the water pump; if the current suction pressure PsEqual to preset suction pressure P'sKeeping the rotating speed of the water pump; if the current suction pressure PsLess than preset suction pressure P'sThe speed of the water pump is increased. The storage module is also used for storing preset heat storage running time t'rAnd a preset suction pressure P's。
If the current suction pressure PsGreater than preset suction pressure P'sI.e. indicating the current suction pressure P of the air conditioning systemsIf the rotating speed of the water pump is larger, the rotating speed of the water pump needs to be reduced, so that the heat exchange efficiency of the outdoor heat exchanger and the first heat exchanger is reduced, and the operating condition of the air conditioning system is stable; if the current suction pressure PsEqual to preset suction pressure P'sI.e. indicating the current suction pressure P of the air conditioning systemsThe operation condition of the air conditioning system is relatively stable, and the rotating speed of the water pump is kept unchanged; if the current suction pressure PsLess than preset suction pressure P'sI.e. indicating the current suction pressure P of the air conditioning systemsThe air-conditioning system has the advantages that the air-conditioning system is small in size, the rotating speed of the water pump needs to be increased, the heat exchange efficiency of the outdoor heat exchanger and the heat exchange efficiency of the first heat exchanger are improved, the heating efficiency of the air-conditioning system is further improved, and the suction pressure P can be guaranteed through adjustmentsIs getting closer to the preset suction pressure P'sTherefore, the heating efficiency of the air conditioning system can be improved on the basis of ensuring the relatively stable operation condition of the air conditioning system.
Further onRecording the operating time t of the heat storage devicerThen, the method further comprises the following steps: if the operating time t of the heat storage devicerGreater than preset heat storage running time t'rAnd returning to the step of acquiring the current working mode of the air conditioning system, so as to avoid that the operating condition of the air conditioning system cannot reach a steady state due to the fact that the air conditioning system simultaneously adjusts the outdoor throttling device and the water pump.
Optionally, after acquiring the current operating mode of the air conditioning system, the method further includes: when the air conditioning system is currently in a heating mode and is in a second heating quitting condition, controlling the first control valve and the water pump to be closed, wherein the second heating quitting condition is as follows: the air conditioning system receives a shutdown instruction, the air conditioning system receives a standby instruction and the outdoor environment temperature TaoGreater than fifth preset heating temperature T'aor5Or heat storage devicerLess than a third preset heat supply quantity Q'r3Wherein the third predetermined heat supply amount Q'r3Less than a second preset heat supply quantity Q'r2. The storage module is further used for storing a fifth preset heating temperature T'aor5And a third predetermined heat supply amount Q'r3. When the air conditioning system meets any one of the conditions, the heat storage medium in the heat storage device does not need to continuously exchange heat with the refrigerant in the outdoor heat exchanger, and the first control valve and the water pump are controlled to be closed at the moment, so that the heat storage medium with lower temperature in the heat storage device can be prevented from absorbing heat from the refrigerant in the outdoor heat exchanger, and the heat exchange efficiency of the air conditioning system is reduced.
Further, after controlling the first control valve and the water pump to be closed, the method further comprises the following steps: respectively obtaining the superheat degree T of the refrigerant at the refrigerant outlet of each outdoor heat exchangerso(ii) a According to the superheat degree T of the refrigerantsoAnd preset refrigerant superheat degree T'soRespectively adjusting the refrigerant flow in each outdoor heat exchanger to ensure that the refrigerant superheat degree T on each parallel branchsoRespectively approaching to preset refrigerant superheat degree T 'on each parallel branch'soThe refrigerant in the air conditioning system is reasonably distributed to each outdoor heat exchanger, and the heating effect of the air conditioning system is further improved. How to depend on the superheat degree T of the refrigerantsoRegulating chamberRefrigerant flow in the external heat exchanger, and how to depend on the refrigerant superheat TsoAnd preset refrigerant superheat degree T'soThe refrigerant flow rate in each outdoor heat exchanger is adjusted separately, which has been described in detail above and will not be described herein again.
Optionally, after acquiring the current operating mode of the air conditioning system, the method further includes: recording the operating time t of an air conditioning systemoIf the operation time t of the air conditioning system isoIs more than or equal to the preset running time t 'of the air conditioning system'oAnd returning to the step of obtaining the current working mode of the air conditioning system, wherein the air conditioning system has preset running time t'oGreater than preset heat storage running time t'rEach time a preset running time t 'of the air conditioning system passes'oAnd the air conditioning system can reacquire the parameters so that the acquired parameters are more matched with the current operating condition of the air conditioning system. The storage module is also used for storing preset running time t'o。
Referring to fig. 7 to 8, the auxiliary loop in the air conditioning system further includes a cold storage device connected in parallel to both ends of the heat storage device; the second control valve, the second control valve is established ties with cold-storage device to parallelly connected with the heat accumulation device, the second control valve is used for controlling cold-storage device and first heat exchanger intercommunication or disconnection, after obtaining the current mode of operation of air conditioning system, still includes: when the air conditioning system is in a refrigeration mode and is in a first refrigeration condition (namely the air conditioning system is in a normal refrigeration mode), controlling the second control valve, the water pump, the throttling device, the electromagnetic valve and the outdoor throttling device to be opened, and controlling the first control valve to be closed; the first refrigeration condition is: outdoor ambient temperature TaoHigher than first refrigerating ambient temperature T'aoc1And the cooling capacity Q of the cold storage devicecIs greater than a first preset cold quantity Q'c1. The air conditioning system also comprises a seventh temperature sensor, the seventh temperature sensor is used for detecting the temperature change value of the cold accumulation medium in the cold accumulation device, and the calculation module calculates the cold supply quantity Q according to the temperature change value of the cold accumulation medium in the cold accumulation device detected by the seventh temperature sensorc. The storage module is also used for storing first refrigerationAmbient temperature T'aoc1And the first preset refrigerating capacity Q'c1. When the outdoor ambient temperature TaoHigher than first refrigerating ambient temperature T'aoc1And the cooling capacity Q of the cold storage devicecIs greater than a first preset cold quantity Q'c1The controller controls the second control valve, the water pump, the electromagnetic valve and the outdoor throttling device to be opened, controls the first control valve to be closed, and provides cold energy for the outdoor heat exchanger by the cold accumulation medium in the cold accumulation device, so that the refrigeration effect of the air conditioning system can be improved.
It should be noted that: heat supply QrAnd cooling capacity QcThe units of (A) are all: j (joules), wherein the heat supply Q of the heat storage devicerThe temperature of a heat storage medium in the heat storage device is higher than the temperature of refrigerant in the outdoor heat exchanger, so that the temperature of the refrigerant in the outdoor heat exchanger can be increased; cooling capacity QcThe temperature of the cold storage medium in the cold storage device is lower than the temperature of the refrigerant in the outdoor heat exchanger, so that the temperature of the refrigerant in the outdoor heat exchanger can be reduced.
Referring to fig. 7 and 8, the air conditioning system further includes: the control module can adjust the rotating speed of the water pump according to the exhaust pressure detected by the second pressure sensor when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the outdoor heat exchanger; after the second control valve, the water pump, the electromagnetic valve and the outdoor throttling device are controlled to be opened and the first control valve is controlled to be closed, the control method of the air conditioning system further comprises the following steps: recording the operating time t of the cold storage devicec(ii) a If the operation time t of the cold storage devicecIs less than or equal to preset cold accumulation running time t'cThen the current discharge pressure P of the compressor is obtainedd(ii) a If the current exhaust pressure PdGreater than first preset exhaust pressure P'd1Increasing the rotating speed of the water pump; if the current exhaust pressure PdIs equal to a first preset exhaust pressure P'd1Keeping the rotating speed of the water pump; if it is currentExhaust pressure PdIs less than a first preset exhaust pressure P'd1The speed of the water pump is reduced. The storage module is also used for storing preset cold storage running time t'cAnd a first preset exhaust pressure P'd1。
If the current exhaust pressure PdGreater than first preset exhaust pressure P'd1The rotation speed of the water pump needs to be increased so that the current exhaust pressure P of the compressordThe heat exchange efficiency of the outdoor heat exchanger is reduced to ensure that the air conditioning system can stably operate, otherwise, if the current exhaust pressure P is lowerdIs less than a first preset exhaust pressure P'd1The rotating speed of the water pump needs to be reduced, and the heat exchange efficiency of the outdoor heat exchanger needs to be increased, so that the current exhaust pressure P of the compressordIncreasing to ensure stable operation of the air conditioning system if the current exhaust pressure PdIs equal to a first preset exhaust pressure P'd1And then, the rotating speed of the water pump in the air-conditioning system is proper, the rotating speed of the water pump does not need to be adjusted, and the rotating speed of the water pump is kept.
Optionally, after recording the operation time of the cold storage device, the method further comprises: if the operation time t of the cold storage devicecGreater than preset cold accumulation running time t'cAnd returning to the step of acquiring the current working mode of the air conditioning system.
Referring to fig. 7 and 9, the air conditioning system includes a third temperature sensor, each outdoor heat exchanger is provided with a third temperature sensor at a refrigerant port close to the four-way valve, and the third temperature sensor is used for detecting the refrigerant temperature at the refrigerant port of the outdoor heat exchanger on the parallel branch where the third temperature sensor is located; the calculation module can calculate the supercooling degree of the refrigerant of the outdoor heat exchanger according to the temperature of the refrigerant detected by the third temperature sensor and the saturation temperature of the refrigerant corresponding to the exhaust pressure detected by the second pressure sensor; after acquiring the current operating mode of the air conditioning system, the control method of the air conditioning system further comprises the following steps: when the air conditioning system is currently in a refrigeration mode and meets the condition that the cold accumulation device quits, controlling the second control valve and the water pump to be closed; respectively obtaining the refrigerant outlet of each outdoor heat exchangerCurrent refrigerant supercooling degree Tou(ii) a If the current supercooling degree T of the refrigerantouIs greater than preset supercooling degree T'ouIncreasing the opening degree of the outdoor throttling device; if the current supercooling degree T of the refrigerantouEqual to preset supercooling degree T'ouKeeping the opening degree of the outdoor throttling device; if the current supercooling degree T of the refrigerantouIs less than preset supercooling degree T'ouReducing the opening degree of the outdoor throttling device; the cold accumulation device quits the conditions as follows: the air conditioning system receives a shutdown instruction, enters a standby mode and has an outdoor environment temperature TaoIs less than or equal to the second refrigeration ambient temperature T'aoc2Or the cold quantity Q of the cold accumulation devicecIs less than a second preset cold quantity Q'c2And wherein the secondary refrigeration ambient temperature T'aoc2Is less than a first refrigeration ambient temperature T'aoc1Second preset cooling capacity Q'c2Is less than a first preset cold quantity Q'c1. The storage module is also used for storing preset supercooling degree T'ouAnd a second refrigeration ambient temperature T'aoc2And a second preset cooling capacity Q'c2。
Wherein, if the current refrigerant supercooling degree T of the parallel branch where the outdoor heat exchanger is positionedouIs greater than preset supercooling degree T'ouIf the temperature of the refrigerant at the outlet of the outdoor heat exchanger on the parallel branch is relatively low, namely the heat exchange capacity of the outdoor heat exchanger on the parallel branch is relatively strong, the opening degree of the outdoor throttling device on the parallel branch is controlled to be increased; if the current supercooling degree T of the refrigerantouEqual to preset supercooling degree T'ouThe heat exchange capacity of the outdoor heat exchangers on the parallel branches is proper, and the opening degree of the outdoor throttling device is controlled to be kept unchanged; if the current supercooling degree T of the refrigerantouIs less than preset supercooling degree T'ouIf the temperature of the refrigerant at the outlet of the outdoor heat exchanger on the parallel branch is higher, namely the heat exchange capacity of the outdoor heat exchanger on the parallel branch is relatively weaker, the opening degree of the outdoor throttling device is reduced by control at the moment, so that the refrigerant at the outlet of the refrigerant of the outdoor heat exchanger has proper refrigerant supercooling degree, and the refrigerant refrigeration degree T of the outdoor heat exchanger is ensuredouMore and more approach toPreset supercooling degree T'ouThereby ensuring that the air conditioning system has higher heat exchange efficiency.
It should be noted that: because the heat exchange efficiency of the outdoor heat exchangers on each parallel branch is different, the heat exchange efficiency of each outdoor heat exchanger is usually obtained according to the flowing direction of the airflow, the heat exchange efficiency of the outdoor heat exchanger through which the airflow firstly flows is highest, and the heat exchange effects of the other outdoor heat exchangers are sequentially reduced along with the flowing direction of the airflow, so that the heat exchange efficiency of each outdoor heat exchanger is proper, the heat exchange efficiency of the air conditioning system is more matched with the current operating condition, the energy consumption of the air conditioning system is further improved, and the preset supercooling degree T 'of the refrigerant in the outdoor heat exchanger on each parallel branch is'ouAll values of (A) are different.
Optionally, the current refrigerant supercooling degree T at the refrigerant outlet of each outdoor heat exchanger is obtained respectivelyouThen, the method further comprises the following steps: recording the operating time t of an air conditioning systemoIf the operation time t of the air conditioning system isoGreater than preset running time t 'of air conditioning system'oReturning to the step of obtaining the current working mode of the air conditioning system, and if the running time t of the air conditioning system is upoIs less than or equal to preset running time t 'of air conditioning system'oThen returning to respectively obtain the current refrigerant supercooling degree T at the refrigerant outlet of each outdoor heat exchangerouAnd readjusting the opening degree of the outdoor throttling device according to the newly obtained parameters so that the opening degree of the outdoor throttling device is more matched with the current operating condition of the air conditioning system.
Referring to fig. 10, after acquiring the current operating mode of the air conditioning system, the method further includes: when the air conditioning system is currently in a refrigeration mode and meets a second refrigeration condition, controlling the second control valve and the water pump to be closed, controlling the throttling device to be opened, controlling the electromagnetic valve on the parallel branch where at least one outdoor heat exchanger is located and the outdoor throttling device to be closed, and controlling the electromagnetic valves on the parallel branches where the other outdoor heat exchangers are located and the outdoor throttling device to be opened; the second refrigeration condition is: the operating frequency f of the compressor is less than or equal to the minimum operating frequency fminIndoor exchangerCoil temperature T of at least one indoor heat exchanger in a heat exchangermidLess than or equal to preset coil temperature T'midAnd lasts for a fourth preset time t'4Outdoor ambient temperature TaoIs lower than a third refrigerating ambient temperature T'aoc3And the rotating speed n of the fan is less than or equal to the lowest rotating speed nminAnd wherein the third refrigerated ambient temperature T'aoc3Is less than the secondary refrigeration ambient temperature T'aoc2. The storage module is also used for storing preset coil temperature T'midAnd a fourth preset time t'4And a third refrigeration ambient temperature T'aoc3Minimum rotational speed nminMinimum operating frequency fmin. The air conditioning system further comprises a plurality of eighth temperature sensors, and each indoor heat exchanger is provided with at least one eighth temperature sensor for detecting the temperature of the coil of the indoor heat exchanger.
When the air conditioning system is determined to be in the refrigeration mode currently and meet the second refrigeration condition, the air conditioning system is indicated to be in the low-temperature refrigeration working condition, when the controller receives an instruction that the air conditioning system is in the low-temperature refrigeration working condition, the controller can send a corresponding control instruction to control the electromagnetic valve and the outdoor throttling device on the parallel branch where the at least one outdoor heat exchanger is located to be closed, and at the moment, part of refrigerant in the air conditioning system can be stored in the outdoor heat exchanger on the parallel branch to reduce the flow of the refrigerant in the air conditioning system and the heat exchange area of the outdoor heat exchanger, so that the heat exchange capacity of the outdoor heat exchanger is reduced, and the situation that the refrigerant in the indoor heat exchanger in the air conditioning system is low in temperature and the indoor heat exchanger frequently enters the anti-freezing protection mode can be effectively avoided.
It should be noted that: the air conditioning system is in a high-temperature heating working condition, so as to avoid the condition that the air conditioning system has high-pressure protection when the indoor unit is turned on only, wherein the minimum operating frequency f of the compressorminRefers to the lowest frequency that the manufacturer drive can do, typically 15 hz. Lowest speed n of fan (outdoor fan)minMinimum rotational speed n of outdoor fanminIt may be 0rpm, but if the heat radiation mode of the outdoor heat exchanger is adoptedIn an air cooling heat dissipation mode, the lowest rotating speed n of the outdoor fanminCan not be 0rpm (revolution/minute), and the lowest rotating speed n of the outdoor fan at the momentminTypically 200 rpm.
Optionally, after controlling the second control valve and the water pump to be closed, controlling the throttling device to be opened, controlling the electromagnetic valve and the outdoor throttling device on the parallel branch where the at least one outdoor heat exchanger is located to be closed, and controlling the electromagnetic valve and the outdoor throttling device on the parallel branch where the other outdoor heat exchangers are located to be opened, and controlling the electromagnetic valve and the outdoor throttling device on the parallel branch where the at least one outdoor heat exchanger is located to be closed, the method further includes: recording the first closing time t of the electromagnetic valve and the outdoor throttling devicef1(ii) a If the first closing time tf1Is greater than or equal to a first preset closing time t'fg1Returning to the step of obtaining the current working mode of the air conditioning system, and if the first closing time t is upf1Is less than a first preset closing time t'fg1And the judgment result shows that the closing time for controlling the closing of the electromagnetic valve on the parallel branch where the at least one outdoor heat exchanger is located and the outdoor throttling device is short, the operation working condition of the air-conditioning system does not reach the steady state at the moment, and the first closing time t is continuously judgedf1And a first preset off time t'fg1The size of (c) between. The storage module is used for storing a first preset closing time t'fg1。
Further, after acquiring the current operating mode of the air conditioning system, the method further comprises the following steps: when the air conditioning system is currently in a refrigeration mode and meets the condition of quitting refrigeration, controlling both the electromagnetic valve and the outdoor throttling device to be opened; and (3) exiting the refrigeration condition: the air conditioning system receives a shutdown instruction or shifts to a standby mode and an outdoor environment temperature TaoHigher than fourth refrigerating ambient temperature T'aoc4Coil temperature T of all indoor heat exchangersmidIs greater than or equal to a first preset coil temperature T'mid1And lasts for a fifth preset time t'5And wherein the fourth refrigerated ambient temperature T'aoc4Greater than third refrigeration ambient temperature T'aoc3. The storage module is further used for storing a first preset coil temperature T'mid1Fifth, thePreset time t'5And a fourth refrigerated ambient temperature T'aoc4. When the fact that the air conditioning system is currently in the refrigeration mode and meets the condition of quitting refrigeration is determined, namely the fact that the air conditioning system is in a normal refrigeration working condition is indicated, at the moment, the controller can send a corresponding control instruction, the control electromagnetic valve and the outdoor throttling device are both opened, all the outdoor heat exchangers are all put into use, and therefore the refrigeration effect of the air conditioning system can be guaranteed.
Further, after the control electromagnetic valve and the outdoor throttling device are both opened, the method further comprises the following steps: respectively obtaining the current supercooling degree T of the refrigerant at the refrigerant outlet of each outdoor heat exchangerou(ii) a If the current supercooling degree T of the refrigerantouIs greater than preset supercooling degree T'ouIncreasing the opening degree of the outdoor throttling device; if the current supercooling degree T of the refrigerantouEqual to preset supercooling degree T'ouKeeping the opening degree of the outdoor throttling device; if the current supercooling degree T of the refrigerantouIs less than preset supercooling degree T'ouThe opening degree of the outdoor throttling device is reduced so as to optimize the refrigerating effect of the air conditioning system. How to depend on the degree of supercooling T of the refrigerantouRegulating refrigerant flow in outdoor heat exchanger, and how to adjust refrigerant supercooling degree TouAnd a preset supercooling degree T'ouThe refrigerant flow rate in each outdoor heat exchanger is adjusted separately, which has been described in detail above and will not be described herein again.
Optionally, the current refrigerant supercooling degree T at the refrigerant outlet of each outdoor heat exchanger is obtained respectivelyouThen, the method further comprises the following steps: recording the operating time t of an air conditioning systemo(ii) a If the operation time t of the air conditioning systemoIs more than or equal to preset running time t'oReturning to the step of obtaining the current working mode of the air conditioning system, and if the running time t of the air conditioning system is upoIs less than preset running time t'oThen returning to respectively obtain the current refrigerant supercooling degree T at the refrigerant outlet of each outdoor heat exchangerouAccording to the refrigerant supercooling degree T obtained againouAnd adjusting the opening degree of each outdoor throttling device to improve the refrigeration effect of the air conditioning system.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (26)

1. An air conditioning system is characterized by comprising a refrigerant main loop and an auxiliary loop, wherein the refrigerant main loop comprises a four-way valve, a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, wherein a first end of the four-way valve is communicated with an exhaust port of the compressor, a second end of the four-way valve is communicated with the indoor heat exchanger, a third end of the four-way valve is communicated with an air suction port of the compressor, a fourth end of the four-way valve is communicated with the outdoor heat exchanger, and a throttling device is arranged on a connecting pipeline of the indoor heat exchanger and the outdoor heat exchanger;
the auxiliary loop comprises a heat storage device, a first control valve, a first heat exchanger and a water pump which are sequentially connected end to end, wherein a heat storage medium is stored in the heat storage device, the first control valve is used for controlling the heat storage device to be communicated with or disconnected from the first heat exchanger, the water pump can guide the heat storage medium into the first heat exchanger, and the first heat exchanger is arranged on one side of the outdoor heat exchanger and can exchange heat with the outdoor heat exchanger;
the air conditioning system further includes:
a controller comprising a control module;
the control module can adjust the rotating speed of the water pump according to the suction pressure detected by the first pressure sensor when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the indoor heat exchanger.
2. The air conditioning system of claim 1, wherein the auxiliary circuit further comprises:
the cold accumulation device is connected in parallel at two ends of the heat accumulation device, and a cold accumulation medium is stored in the cold accumulation device;
the second control valve is connected with the cold accumulation device in series and connected with the heat storage device in parallel, the second control valve is used for controlling the cold accumulation device to be communicated or disconnected with the first heat exchanger, and the water pump can guide the cold accumulation medium into the first heat exchanger.
3. The air conditioning system of claim 1, further comprising:
and the heating device is connected with the heat storage device and can provide heat for the heat storage medium.
4. The air conditioning system as claimed in claim 3, wherein the outdoor heat exchanger includes at least two, a plurality of the outdoor heat exchangers are connected in parallel with each other, and at least one first heat exchanger is disposed between every two adjacent outdoor heat exchangers.
5. The air conditioning system of claim 4, wherein the outdoor heat exchanger and the first heat exchanger are attached to each other.
6. The air conditioning system of claim 4, further comprising:
and the electromagnetic valve is arranged at one end of each parallel branch of each outdoor heat exchanger, which is close to the four-way valve, and is used for communicating or disconnecting the outdoor heat exchanger and the four-way valve.
7. An air conditioning system according to any one of claims 4 to 6, further comprising:
the outdoor throttling device is arranged at one end, close to the throttling device, of a parallel branch of each outdoor heat exchanger, and the outdoor throttling device can adjust the flow of refrigerant flowing out of the outdoor throttling device.
8. The air conditioning system as claimed in any one of claims 1 to 6, wherein the indoor heat exchangers comprise at least two indoor heat exchangers, the indoor heat exchangers are connected in parallel, and the throttling device is arranged at one end of each parallel branch of each indoor heat exchanger, which is far away from the four-way valve.
9. The air conditioning system according to any one of claims 1 to 6, further comprising:
the fans are arranged in parallel at intervals, and airflow generated by the fans sequentially flows through the outdoor heat exchangers;
a motor for driving the fan to rotate clockwise or counterclockwise.
10. The air conditioning system of claim 6, further comprising:
a first temperature sensor for detecting a temperature of the heat storage medium in the heat storage device;
the heating device and the first temperature sensor are both electrically connected with the controller, and the control module can selectively turn on or off the heating device according to the temperature of the heat storage medium detected by the first temperature sensor.
11. The air conditioning system of claim 10, further comprising:
the second temperature sensor, every outdoor heat exchanger is close to all be equipped with at the refrigerant port department of solenoid valve the second temperature sensor, the second temperature sensor is used for detecting respectively on its place branch road the refrigerant temperature at the refrigerant port department of outdoor heat exchanger, the second temperature sensor with the controller electricity is connected, the controller still includes:
and the calculation module can calculate the refrigerant superheat degree of the outdoor heat exchanger according to the refrigerant temperature detected by the second temperature sensor and the refrigerant saturation temperature corresponding to the suction pressure detected by the first pressure sensor.
12. The air conditioning system of claim 11, further comprising:
the control module can adjust the rotating speed of the water pump according to the discharge pressure detected by the second pressure sensor when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the outdoor heat exchanger.
13. The air conditioning system of claim 12, further comprising:
the refrigerant port of each outdoor heat exchanger, which is close to the four-way valve, is provided with a third temperature sensor, and the third temperature sensor is used for detecting the temperature of the refrigerant at the refrigerant port of the outdoor heat exchanger on the branch in which the third temperature sensor is arranged;
the calculation module can calculate the refrigerant supercooling degree of the outdoor heat exchanger according to the refrigerant temperature detected by the third temperature sensor and the refrigerant saturation temperature corresponding to the exhaust pressure detected by the second pressure sensor.
14. A control method of an air conditioning system, which is applied to the air conditioning system according to any one of claims 1 to 13, the control method of the air conditioning system comprising the steps of:
acquiring a current working mode of the air conditioning system;
when the air conditioning system is in a heating mode currently and meets defrosting conditions, controlling the throttling device, the first control valve and the water pump to be opened;
the air conditioning system includes:
a controller comprising a control module;
the control module can adjust the rotating speed of the water pump according to the suction pressure detected by the first pressure sensor when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the indoor heat exchanger.
15. The control method of an air conditioning system according to claim 14, characterized in that the air conditioning system includes a heating device that is connected to the heat storage device and is capable of supplying heat to the heat storage medium; a first temperature sensor for detecting a temperature of the heat storage medium in the heat storage device; the heating device and the first temperature sensor are both electrically connected with the controller, and the control module can selectively turn on or off the heating device according to the temperature of the heat storage medium detected by the first temperature sensor; before the controlling the throttle device, the first control valve, and the water pump are all turned on, the control method of the air conditioning system further includes:
acquiring the current heat supply amount of the heat storage device;
if the current heat supply amount is larger than a first preset heat supply amount, executing the step of controlling the throttle device, the first control valve and the water pump to be opened;
and if the current heat supply amount is less than or equal to the first preset heat supply amount, controlling the heating device to be opened, and then executing the step of controlling the throttling device, the first control valve and the water pump to be opened.
16. The control method of an air conditioning system according to claim 15, wherein the air conditioning system includes at least a plurality of the outdoor heat exchangers, the plurality of the outdoor heat exchangers being connected in parallel with each other; the fans are arranged in parallel at intervals, and airflow generated by the fans sequentially flows through the outdoor heat exchangers; the motor is used for driving the fan to rotate clockwise or anticlockwise, the air-conditioning system further comprises electromagnetic valves, one end, close to the four-way valve, of a parallel branch of each outdoor heat exchanger is provided with the electromagnetic valve, and the electromagnetic valves are used for communicating or disconnecting the outdoor heat exchangers and the four-way valve; the outdoor throttling device is arranged at one end, close to the throttling device, of a parallel branch of each outdoor heat exchanger, and the outdoor throttling device can adjust the flow of refrigerant flowing out of the outdoor throttling device; after the controlling the throttle device, the first control valve, and the water pump are all opened, the control method of the air conditioning system further includes:
controlling the electromagnetic valve and the outdoor throttling device to be opened;
acquiring the current rotation direction of the motor;
defrosting: and controlling the rotation direction of the motor to be adjusted to be the reverse direction of the current rotation direction so as to adjust the flowing direction of the air flow generated by the fan, and defrosting the outdoor heat exchanger through which the air flow passes firstly before the rotation direction of the motor is adjusted.
17. The method of claim 16, wherein after the obtaining the current rotation direction of the motor, before the controlling the rotation direction of the motor is adjusted to be opposite to the current rotation direction, the method further comprises:
and according to the current rotation direction of the motor, obtaining the flow direction of the airflow generated by the fan, and controlling the electromagnetic valve and the outdoor throttling device on the parallel branch where the outdoor heat exchanger passes through firstly to be closed.
18. The method as claimed in claim 17, wherein a second temperature sensor is provided at a refrigerant port of each of the outdoor heat exchangers near the solenoid valve, the second temperature sensors are respectively used for detecting the refrigerant temperature at the refrigerant ports of the outdoor heat exchangers on the branch path where the second temperature sensor is located, the second temperature sensors are electrically connected to the controller, and the controller further comprises: the calculation module can calculate the superheat degree of the refrigerant of the outdoor heat exchanger according to the refrigerant temperature detected by the second temperature sensor and the refrigerant saturation temperature corresponding to the suction pressure detected by the first pressure sensor; after the electromagnetic valve and the outdoor throttling device on the parallel branch where the outdoor heat exchanger where the air flow passes through first are closed, before the rotation direction of the motor is controlled to be adjusted to be opposite to the current rotation direction, the control method of the air conditioning system further comprises the following steps:
respectively acquiring the current refrigerant superheat degrees of parallel branches where other outdoor heat exchangers except the outdoor heat exchanger through which the airflow passes firstly are located;
if the current refrigerant superheat degree is larger than the preset refrigerant superheat degree, the opening degree of an outdoor throttling device on the parallel branch is increased;
if the current refrigerant superheat degree is equal to the preset refrigerant superheat degree, keeping the opening degree of the outdoor throttling device on the parallel branch;
and if the current refrigerant superheat degree is smaller than the preset refrigerant superheat degree, reducing the opening degree of the outdoor throttling device on the parallel branch.
19. The control method of an air conditioning system as claimed in claim 18, further comprising a second pressure sensor for detecting a discharge pressure of the compressor, and further comprising, after the solenoid valve and the outdoor throttle device on the parallel branch where the outdoor heat exchanger through which the control air stream passes first are both closed:
recording the defrosting accumulated time of the outdoor heat exchanger through which the airflow passes firstly;
if the defrosting accumulated time is greater than or equal to a first preset time, acquiring the defrosting temperature corresponding to the outdoor heat exchanger through which the airflow passes firstly and the current exhaust pressure of the compressor;
when the defrosting temperature corresponding to the outdoor heat exchanger through which the airflow passes first is greater than or equal to a preset defrosting temperature and lasts for a second preset time, the exhaust pressure is greater than or equal to a preset exhaust pressure, or the defrosting accumulated time is greater than or equal to a third preset time, controlling the electromagnetic valve and the outdoor throttling device to be opened, wherein the first preset time is less than the third preset time.
20. The method for controlling an air conditioning system according to claim 18, wherein after the obtaining of the current operation mode of the air conditioning system, the method further comprises:
when the air conditioning system is in a heating mode currently and meets a first heating condition, controlling the first control valve and the water pump to be closed, controlling the throttling devices to be opened, controlling the electromagnetic valve on the parallel branch where at least one outdoor heat exchanger is located and the outdoor throttling device to be closed, and controlling the electromagnetic valves on the parallel branches where the other outdoor heat exchangers are located and the outdoor throttling devices to be opened;
the first heating condition is as follows: the operation frequency of the compressor is less than or equal to the minimum operation frequency, the rotating speed of the fan is less than or equal to the minimum rotating speed, and the outdoor environment temperature is higher than a first preset heating temperature;
or the first heating condition is as follows: the number of times of high-voltage protection of the air conditioning system is greater than or equal to the preset number of times of high-voltage protection.
21. The method for controlling an air conditioning system according to claim 20, further comprising, after the obtaining of the current operating mode of the air conditioning system:
when the air conditioning system is in a heating mode and in a second heating condition, controlling the electromagnetic valve, the outdoor throttling device, the first control valve and the water pump to be opened;
the second heating condition is as follows: the heat storage device provides the heat supply is greater than the second and predetermines heat supply, just outdoor ambient temperature is less than the second and predetermines the temperature of heating, wherein, the second is predetermine the temperature of heating and is less than first predetermine the temperature of heating.
22. The control method of an air conditioning system according to claim 21, further comprising, after said controlling all of said solenoid valve, said outdoor throttle device, said first control valve, and said water pump to be open:
recording the operating time of the heat storage device;
if the running time of the heat storage device is less than or equal to the preset heat storage running time, acquiring the current suction pressure of the compressor;
if the current suction pressure is larger than the preset suction pressure, reducing the rotating speed of the water pump;
if the current suction pressure is equal to the preset suction pressure, the rotating speed of the water pump is kept;
and if the current suction pressure is smaller than the preset suction pressure, increasing the rotating speed of the water pump.
23. The control method of an air conditioning system as set forth in claim 18, wherein said auxiliary circuit further includes a cold storage device connected in parallel across said heat storage device; the second control valve is connected with the cold accumulation device in series and connected with the heat storage device in parallel, the second control valve is used for controlling the cold accumulation device to be communicated or disconnected with the first heat exchanger, and after the current working mode of the air conditioning system is obtained, the second control valve further comprises:
when the air conditioning system is in a refrigeration mode and is in a first refrigeration condition, the second control valve, the water pump, the throttling device, the electromagnetic valve and the outdoor throttling device are controlled to be opened, and the first control valve is controlled to be closed;
the first refrigeration condition is as follows: the outdoor environment temperature is higher than the first refrigeration environment temperature, and the cold supply amount of the cold accumulation device is larger than the first preset cold amount.
24. The control method of an air conditioning system according to claim 23, further comprising: the control module is used for adjusting the rotating speed of the water pump according to the discharge pressure detected by the second pressure sensor when the four-way valve guides the refrigerant discharged from the air outlet of the compressor into the outdoor heat exchanger; after the second control valve, the water pump, the electromagnetic valve and the outdoor throttling device are controlled to be opened and the first control valve is controlled to be closed, the control method of the air conditioning system further comprises the following steps:
recording the operation time of the cold accumulation device;
if the operation time of the cold accumulation device is less than or equal to the preset cold accumulation operation time, acquiring the current exhaust pressure of the compressor;
if the current exhaust pressure is greater than a first preset exhaust pressure, increasing the rotating speed of the water pump;
if the current exhaust pressure is equal to the first preset exhaust pressure, the rotating speed of the water pump is kept;
and if the current exhaust pressure is smaller than the first preset exhaust pressure, reducing the rotating speed of the water pump.
25. The control method of the air conditioning system as claimed in claim 24, wherein the air conditioning system comprises a third temperature sensor, each of the outdoor heat exchangers is provided with the third temperature sensor near the refrigerant port of the four-way valve, and the third temperature sensor is used for detecting the refrigerant temperature at the refrigerant port of the outdoor heat exchanger on the parallel branch where the third temperature sensor is located; the calculation module can calculate the refrigerant supercooling degree of the outdoor heat exchanger according to the refrigerant temperature detected by the third temperature sensor and the refrigerant saturation temperature corresponding to the exhaust pressure detected by the second pressure sensor; after the obtaining of the current operating mode of the air conditioning system, the method for controlling the air conditioning system further includes:
when the air conditioning system is currently in a refrigeration mode and meets the condition that the cold accumulation device exits, controlling the second control valve and the water pump to be closed;
respectively acquiring the current refrigerant supercooling degree of each outdoor heat exchanger;
if the current supercooling degree of the refrigerant is larger than the preset supercooling degree, increasing the opening degree of the outdoor throttling device;
if the current supercooling degree of the refrigerant is equal to the preset supercooling degree, keeping the opening degree of the outdoor throttling device;
if the current supercooling degree of the refrigerant is smaller than the preset supercooling degree, reducing the opening degree of the outdoor throttling device;
the cold accumulation device quits under the conditions that: the air conditioning system receives a shutdown instruction, the air conditioning system enters a standby mode, the outdoor environment temperature is less than or equal to a second refrigeration environment temperature, or the cold quantity of the cold accumulation device is less than a second preset cold quantity, wherein the second refrigeration environment temperature is less than the first refrigeration environment temperature, and the second preset cold quantity is less than the first preset cold quantity.
26. The method for controlling an air conditioning system according to claim 25, further comprising, after the obtaining the current operating mode of the air conditioning system:
when the air conditioning system is in a refrigeration mode currently and meets a second refrigeration condition, controlling the second control valve and the water pump to be closed, controlling the throttling device to be opened, controlling the electromagnetic valve on the parallel branch where at least one outdoor heat exchanger is located and the outdoor throttling device to be closed, and controlling the electromagnetic valves on the parallel branches where the other outdoor heat exchangers are located and the outdoor throttling device to be opened;
the second refrigeration condition is as follows: the operation frequency of the compressor is less than or equal to the minimum operation frequency, the coil temperature of at least one indoor heat exchanger in the indoor heat exchangers is less than or equal to the preset coil temperature and lasts for a fourth preset time, the outdoor environment temperature is lower than the third refrigeration environment temperature, and the rotating speed of the fan is less than or equal to the minimum rotating speed, wherein the third refrigeration environment temperature is less than the second refrigeration environment temperature.
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