CN111503818A - Control method of air conditioning system and air conditioning system - Google Patents

Control method of air conditioning system and air conditioning system Download PDF

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Publication number
CN111503818A
CN111503818A CN202010353570.4A CN202010353570A CN111503818A CN 111503818 A CN111503818 A CN 111503818A CN 202010353570 A CN202010353570 A CN 202010353570A CN 111503818 A CN111503818 A CN 111503818A
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Prior art keywords
conditioning system
air conditioning
temperature
value
temperature value
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CN202010353570.4A
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Chinese (zh)
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CN111503818B (en
Inventor
黎辉玲
杜顺开
谭周衡
曾小朗
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202010353570.4A priority Critical patent/CN111503818B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles

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

Abstract

The invention discloses a control method of an air conditioning system and the air conditioning system. The control method of the air conditioning system comprises the steps of judging whether the air conditioning system runs through a defrosting mode or not, if so, judging whether the air conditioning system meets the condition of a first defrosting mode or not, and controlling the air conditioning system to run the first defrosting mode when the condition of the first defrosting mode is met; if not, judging whether the air conditioning system meets the condition of the second defrosting mode, and controlling the air conditioning system to operate the second defrosting mode when the condition of the second defrosting mode is met. Because in the second defrosting mode, the third preset temperature is lower, after the second defrosting mode condition is met, the air conditioning system is frosted more probably, the second defrosting mode is selected in the first defrosting mode, frostless defrosting of the air conditioning system can be avoided, and further electric energy waste and air conditioning system loss can be reduced.

Description

Control method of air conditioning system and air conditioning system
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioning system and the air conditioning system.
Background
In the technical field of air conditioning, when an air conditioning system defrosts, the four-way valve is not reversed, and refrigerant gas flows out of the indoor heat exchanger and then enters the outdoor heat exchanger through a bypass pipeline connected with the throttling component in parallel to be defrosted. The existing air conditioning system has single judgment on defrosting conditions, and the phenomenon of defrosting without frost is easy to occur, so that the waste of electric energy is caused.
Disclosure of Invention
The invention provides a control method of an air conditioning system, which can accurately judge whether to enter a defrosting mode.
The invention provides an air conditioning system, which adopts the control method of the air conditioning system to control defrosting.
According to the control method of the air conditioning system of the embodiment of the present invention, the air conditioning system includes: the air conditioning system further comprises a first parallel bypass, a second parallel bypass, a heater and a control assembly, wherein the first parallel bypass is connected with a first pipeline where the throttling device is located in parallel, the second parallel bypass is connected with a second pipeline connected between the reversing device and an air return port of the compressor in parallel, the heater is connected in series with the second parallel bypass, and the control assembly controls the on-off of the first parallel bypass and the on-off of the second parallel bypass.
The control method comprises the steps of controlling the heating operation of the air conditioning system and judging whether the air conditioning system operates in a defrosting mode;
if so, judging whether the air-conditioning system meets the condition of a first defrosting mode, and controlling the air-conditioning system to operate the first defrosting mode when the condition of the first defrosting mode is met;
if not, judging whether the air conditioning system meets the condition of a second defrosting mode, and controlling the air conditioning system to operate the second defrosting mode when the condition of the second defrosting mode is met;
wherein, in the first defrosting mode, the compressor is controlled to work, the first parallel bypass and the second parallel bypass are controlled to be respectively communicated, the reversing device controls the air outlet of the compressor to be communicated with the indoor heat exchanger, the air return port of the compressor is communicated with the outdoor heat exchanger, in the second defrosting mode, the compressor is controlled to work, the throttling device works, the first parallel bypass and the second parallel bypass are respectively disconnected, the reversing device controls the air outlet of the compressor to be communicated with the outdoor heat exchanger, and the air return port of the compressor is communicated with the indoor heat exchanger,
the first defrosting mode is carried out under the conditions that whether the continuous heating time reaches a first preset time or not is judged, whether T30-T5 is greater than or equal to a first preset temperature or not and whether T3 is lower than one of second preset temperatures or not is judged, wherein T5 is the temperature of an inlet of the outdoor heat exchanger, T30 is the lowest temperature value of an outlet of the outdoor heat exchanger in a period of time set before the current running state of the outdoor heat exchanger, and T3 is the temperature of the outlet of the outdoor heat exchanger;
and the second defrosting mode is set to judge whether the continuous heating time of the compressor reaches a second preset time and whether T3 is lower than a third preset temperature.
According to the control method of the air conditioning system, whether the air conditioning system runs through the defrosting mode is judged, if yes, whether the air conditioning system meets the condition of the first defrosting mode is judged, and when the condition of the first defrosting mode is met, the air conditioning system is controlled to run the first defrosting mode; if not, judging whether the air conditioning system meets the condition of the second defrosting mode, and controlling the air conditioning system to operate the second defrosting mode when the condition of the second defrosting mode is met. Because in the second defrosting mode, the third preset temperature is lower, after the second defrosting mode condition is met, the air conditioning system is frosted more probably, the second defrosting mode is selected in the first defrosting mode, frostless defrosting of the air conditioning system can be avoided, and further electric energy waste and air conditioning system loss can be reduced.
In some embodiments, a 1: the first preset time is a first time value, and the first preset temperature is a first temperature value;
a2: the first preset time is a second time value, and the first preset temperature is a second temperature value;
a3: the first preset time is a third time value, and the first preset temperature is a third temperature value;
a4: the first preset time is a fourth time value, and the second preset temperature is a fourth temperature value;
a5: the first preset time is a fifth time value, the second preset temperature is a fifth temperature value, wherein the first time value is less than the second time value, less than the third time value, less than the fourth time value and less than the fifth time value, and the first temperature value is greater than the second temperature value, greater than the third temperature value, greater than the fourth temperature value and greater than the fifth temperature value;
wherein the air conditioning system enters the first defrost mode when the air conditioning system satisfies any one of conditions A1 through A5.
In some embodiments, the first time value is (25-40) min, the first temperature value is (0.5-7) deg.C, the second time value is (30-60) min, the second temperature value is (0.5-7) deg.C, the third time value is (40-80) min, the third temperature value is (0.5-7) deg.C, the fourth time value is (30-120) min, the fourth temperature value is (-5-0) deg.C, the fifth time value is (80-200) min, and the fifth temperature value is-15 deg.C.
In some embodiments, the heater is a regenerator, and each of conditions a1 through a5 further requires that T6 be equal to or greater than a fourth predetermined temperature, where T6 is the temperature of the heater.
In some embodiments, the fourth predetermined temperature is (20-100) deg.C.
In some embodiments, in condition a4, the second preset temperature duration needs to be met for a third preset time.
In some embodiments, the third preset time is 3 min.
In some embodiments, B1: the second preset time is a sixth time value, the third preset temperature is a sixth temperature value, and T30-T3 is greater than or equal to a tenth temperature value;
b2: the second preset time is a seventh time value, the third preset temperature is a seventh temperature value, and T30-T3 is greater than or equal to an eleventh temperature value;
b3: the second preset time is an eighth time value, and the third preset temperature is an eighth temperature value;
b4: the second preset time is a ninth time value, the third preset temperature is a ninth temperature value,
the sixth time value is less than the eighth time value and less than the seventh time value and less than the ninth time value, the eighth temperature value is greater than the ninth temperature value and greater than the sixth temperature value and greater than the seventh temperature value, and the eleventh temperature value is greater than the tenth temperature value;
wherein the air conditioning system enters the second defrost mode when the air conditioning system satisfies any one of conditions B1 through B4.
In some embodiments, the sixth time value is (25-40) min, the sixth temperature value is [ (-10) - (-5) ], the tenth temperature value is 1.5 ℃,
the seventh time value is (30-60) min, the seventh temperature value is [ (-10) -0] ° c, the eleventh temperature value is 3 ℃,
the eighth time value is (25-40) min, the eighth temperature value is [ (-25) - (-15) ] ° C,
the ninth time value is (80-200) min, and the ninth temperature value is [ (-20) - (-10) ].
In some embodiments, in condition B3, it is further required that the third preset temperature duration be satisfied for a fourth preset time.
In some embodiments, the fourth preset time is 3 min.
In some embodiments, the heater is provided with a first temperature sensor, the inlet of the outdoor heat exchanger is provided with a second temperature sensor, when the air conditioning system runs in a defrosting mode, before judging whether the condition of the first defrosting mode is met, whether the first temperature sensor and the second temperature sensor are in failure is judged,
if one of the first temperature sensor and the second temperature sensor has a fault, directly judging whether the air conditioning system meets the condition of a second defrosting mode, running the second defrosting mode when the condition of the second defrosting mode is met, and continuously judging whether the condition of the second defrosting mode is met when the condition of the second defrosting mode is not met;
and if the first temperature sensor and the second temperature sensor have no faults, judging whether the air conditioning system meets the condition of a first defrosting mode.
In some embodiments, when the defrosting operation is performed in the first defrosting mode, it is determined whether one of the following three end conditions is satisfied,
c1: t5 is greater than or equal to the twelfth temperature value;
c2: t5 is greater than or equal to a thirteenth temperature value, the defrosting duration time reaches a ninth preset time, and the thirteenth temperature value is less than a twelfth temperature value;
c3: the defrosting time lasts for a fifth preset time, the fifth preset time is longer than a ninth preset time,
wherein the air conditioning system exits the first defrost mode when the air conditioning system satisfies any one of conditions C1 through C3.
In some embodiments, the twelfth temperature value is (4-15) ° C, the thirteenth temperature value is (2-6) ° C, the ninth predetermined time is 40s, and the fifth predetermined time is (2-10) min.
In some embodiments, when the defrosting operation is performed in the second defrosting mode, it is determined whether one of the following three end conditions is satisfied,
d1: t3 is greater than or equal to the fourteenth temperature value;
d2: t3 is greater than or equal to a fifteenth temperature value, the defrosting operation is continuously operated for a seventh preset time, and the fourteenth temperature value is greater than the fifteenth temperature value;
d3: the defrosting operation is continuously operated for a sixth preset time, the sixth preset time is longer than the seventh preset time,
wherein the air conditioning system exits the second defrost mode when the air conditioning system satisfies any one of conditions D1 through D3.
In some embodiments, the fourteenth temperature value is (4-15) ° C, the fifteenth temperature value is (2-10) ° C, the seventh predetermined time is 80s, and the sixth predetermined time is (5-20) min.
In some embodiments, after the defrosting mode operates for two periods, whether the operating time of two consecutive first defrosting modes is less than an eighth preset time, and the T5 is less than or equal to a fifth preset temperature,
if yes, directly judging whether the air conditioning system meets the condition of a second defrosting mode, operating the second defrosting mode when the condition of the second defrosting mode is met, and continuously judging whether the condition of the second defrosting mode is met when the condition of the second defrosting mode is not met;
if not, judging whether the air conditioning system meets the condition of the first defrosting mode.
In some embodiments, the eighth predetermined time is (2-10) min and the fifth predetermined temperature is (0-8) deg.C.
In some embodiments, when determining whether the air conditioning system satisfies the condition of the first defrosting mode, if not, continuing the heating operation or determining whether the condition of the second defrosting mode is satisfied.
According to the air conditioning system of the embodiment of the present invention, the air conditioning system controls defrosting by using the control method of the air conditioning system as described above, and the air conditioning system includes: the air conditioner comprises a compressor, a reversing device, an indoor heat exchanger, an outdoor heat exchanger, a throttling device, a first parallel bypass, a second parallel bypass, a heater and a control assembly, wherein the reversing device is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with an exhaust port of the compressor, the second valve port is connected with a return air port of the compressor, the third valve port is connected with one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected with one end of the throttling device, the fourth valve port is connected with one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected with the other end of the throttling device, the reversing device switches the first valve port to be communicated with one of the third valve port and the fourth valve port and enables the second valve port to be communicated with the other of the third valve port and the fourth valve port, the first parallel bypass is connected in parallel with a first pipeline where the throttling device is located, the second parallel bypass is connected in parallel with a second pipeline connected between the second valve port and the air return port, the heater is connected in series with the second parallel bypass, the control assembly controls the on-off of the first parallel bypass and the on-off of the second parallel bypass, the air conditioning system has a first defrosting mode for defrosting operation, in the first defrosting mode, the first parallel bypass and the second parallel bypass are respectively communicated, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port.
According to the air conditioning system provided by the embodiment of the invention, whether the air conditioning system runs the defrosting mode is judged, if yes, whether the air conditioning system meets the condition of the first defrosting mode is judged, and when the condition of the first defrosting mode is met, the air conditioning system is controlled to run the first defrosting mode; if not, judging whether the air conditioning system meets the condition of the second defrosting mode, and controlling the air conditioning system to operate the second defrosting mode when the condition of the second defrosting mode is met. Because in the second defrosting mode, the third preset temperature is lower, after the second defrosting mode condition is met, the air conditioning system is frosted more probably, the second defrosting mode is selected in the first defrosting mode, frostless defrosting of the air conditioning system can be avoided, and further electric energy waste and air conditioning system loss can be reduced.
In some embodiments, the control component is further capable of adjusting a refrigerant flow distribution of the first parallel bypass and the first pipeline, and/or adjusting a refrigerant flow distribution of the second parallel bypass and the second pipeline.
In some embodiments, the control assembly includes a first control valve that is an electric two-way valve provided on the first parallel bypass, and a second control valve that is an electric three-way valve provided at a position where the second parallel bypass and the second pipe branch in parallel or a position where they merge in parallel.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the refrigeration of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of heating of an air conditioning system according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of defrosting of an air conditioning system according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention.
Reference numerals:
an air conditioning system 100, a compressor 110, an exhaust port 111, a return port 112,
a reversing device 120, a first valve port 121, a second valve port 122, a third valve port 123, a fourth valve port 124,
the indoor heat exchanger 130, the throttling device 140, the outdoor heat exchanger 150, the first parallel bypass 160, the second parallel bypass 170, the heater 180, the control assembly 190, the first pipeline 200, and the second pipeline 210.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A control method of an air conditioning system and the air conditioning system 100 according to an embodiment of the present invention are described below with reference to fig. 1 to 5. As shown in fig. 1 to 3, the air conditioning system 100 includes: the compressor 110, the reversing device 120, the indoor heat exchanger 130, the throttling device 140 and the outdoor heat exchanger 150 form a main loop, and the compressor 110, the reversing device 120, the indoor heat exchanger 130, the throttling device 140 and the outdoor heat exchanger 150 form a main loop. The refrigerant may circulate in the main circuit, wherein the compressor 110 may compress the refrigerant into high-temperature and high-pressure gas to flow out; the indoor heat exchanger 130 may liquefy the refrigerant to release heat or vaporize the refrigerant to absorb heat to heat or cool the indoor air; the outdoor heat exchanger 150 may vaporize the refrigerant to absorb heat or liquefy the refrigerant to release heat, and cooperate with the indoor heat exchanger 130 to circulate the refrigerant from liquefaction to vaporization or from vaporization to liquefaction, thereby improving the heat exchange efficiency of the air conditioning system 100; the reversing device 120 may control a circulation flow direction of the refrigerant flowing out of the compressor 110, that is, the discharge port 111 of the compressor 110 is connected to the indoor heat exchanger 130, and the return port 112 of the compressor 110 is connected to the outdoor heat exchanger 150 to achieve a heating effect, or the discharge port 111 of the compressor 110 is connected to the outdoor heat exchanger 150, and the return port 112 of the compressor 110 is connected to the indoor heat exchanger 130 to achieve a cooling effect; the throttle device 140 may reduce the pressure of the refrigerant to change the high-pressure refrigerant into a low-pressure refrigerant.
Referring to fig. 1 to 3, the air conditioning system 100 further includes a first parallel bypass 160, a second parallel bypass 170, a heater 180, and a control assembly 190, the first parallel bypass 160 is connected in parallel to a first pipe 200 where the throttling device 140 is located, the second parallel bypass 170 is connected in parallel to a second pipe 210 connected between the reversing device 120 and the return air port 112 of the compressor 110, the heater 180 is connected in series to the second parallel bypass 170, and the control assembly 190 controls on/off of the first parallel bypass 160 and on/off of the second parallel bypass 170.
It should be noted that the heater 180 may be used as a component for vaporizing the refrigerant when the air conditioning system 100 defrosts, and the control component 190 may control the first pipeline 200 and the second pipeline 210 to be disconnected when the first parallel bypass 160 and the second parallel bypass 170 are connected; when the first parallel bypass 160 and the second parallel bypass 170 are disconnected, the first pipe 200 and the second pipe 210 are connected. As shown in fig. 1 to 2, when the air conditioning system 100 performs a cooling or heating operation, the first parallel bypass 160 and the second parallel bypass 170 are disconnected, and the refrigerant circulates in the main circuit formed by the compressor 110, the reversing device 120, the indoor heat exchanger 130, the throttling device 140, and the outdoor heat exchanger 150.
As shown in fig. 3, when the air conditioning system 100 performs a defrosting operation, the first parallel bypass 160 and the second parallel bypass 170 are connected, and the refrigerant flows out of the compressor 110, passes through the indoor heat exchanger 130, flows into the first parallel bypass 160, flows into the outdoor heat exchanger 150, flows into the second parallel bypass 170, flows into the heater 180, and flows back to the compressor 110 from the heater 180, thereby forming a circulation flow of the refrigerant. Here, the refrigerant is liquefied and released in both the indoor heat exchanger 130 and the outdoor heat exchanger 150, and thus frost formed on the outdoor heat exchanger 150 can be melted.
As shown in fig. 1 to 5, the control method of the air conditioning system according to the embodiment of the present invention includes controlling a heating operation of the air conditioning system 100 and determining whether the air conditioning system 100 operates in a defrosting mode.
Specifically, referring to fig. 4, when determining whether the air conditioning system 100 has run through the defrosting mode, if yes, determining whether the air conditioning system 100 meets the condition of the first defrosting mode, and when meeting the condition of the first defrosting mode, controlling the air conditioning system 100 to run the first defrosting mode;
if not, judging whether the air conditioning system 100 meets the condition of the second defrosting mode, and controlling the air conditioning system 100 to operate the second defrosting mode when the condition of the second defrosting mode is met;
as shown in fig. 3, in the first defrosting mode, the compressor 110 is controlled to operate, the first parallel bypass 160 and the second parallel bypass 170 are controlled to be respectively communicated, the reversing device 120 controls the exhaust port 111 of the compressor 110 to be communicated with the indoor heat exchanger 130, and the return port 112 of the compressor 110 to be communicated with the outdoor heat exchanger 150; in the second defrosting mode, the compressor 110 is controlled to operate, the throttling device 140 is controlled to operate, the first parallel bypass 160 and the second parallel bypass 170 are respectively disconnected, the reversing device 120 controls the air outlet 111 of the compressor 110 to be communicated with the outdoor heat exchanger 150, and the air return port 112 of the compressor 110 is communicated with the indoor heat exchanger 130.
The first defrosting mode is conditioned by judging whether the continuous heating time reaches a first preset time, and judging whether T30-T5 is greater than or equal to one of a first preset temperature and T3 is lower than a second preset temperature, wherein T5 is the temperature of the inlet of the outdoor heat exchanger 150, T30 is the lowest temperature value of the outlet of the outdoor heat exchanger 150 within a set time before the current operating state of the outdoor heat exchanger 150, and T3 is the temperature of the outlet of the outdoor heat exchanger 150; it is understood that when the continuous heating time reaches the first preset time, it is determined whether the air conditioning system 100 satisfies one of the two conditions of T30-T5 being greater than or equal to the first preset temperature and T3 being lower than the second preset temperature.
It should be noted that the continuous heating time may be an uninterrupted heating operation time of the air conditioning system 100. When the continuous heating time reaches the first preset time, the air conditioning system 100 may be frosted, and the probability of frosting of the air conditioning system 100 may be further increased if the temperature T30-T5 is greater than or equal to the first preset temperature, and similarly, the probability of frosting of the air conditioning system 100 may be increased if the temperature T3 is lower than the second preset temperature.
Wherein, T30 may be the lowest temperature value at the outlet of the outdoor heat exchanger 150 within 7-12min before the current operation state of the outdoor heat exchanger 150. It is understood that the set time is 7-12 min.
The second defrosting mode is set to determine whether the continuous heating time reaches a second preset time and T3 is lower than a third preset temperature. When the continuous heating time reaches the second preset time, T3 is lower than the third preset temperature, and the third preset temperature is lower, frosting of the air conditioning system 100 may occur, and at this time, the second defrosting mode may be started to defrost the air conditioning system 100.
According to the control method of the air conditioning system, whether the air conditioning system 100 runs through the defrosting mode is judged, if yes, whether the air conditioning system 100 meets the condition of the first defrosting mode is judged, and when the condition of the first defrosting mode is met, the air conditioning system 100 is controlled to run the first defrosting mode; if not, whether the air conditioning system 100 meets the conditions of the second defrosting mode is judged, and when the conditions of the second defrosting mode are met, the air conditioning system 100 is controlled to operate the second defrosting mode. Because the third preset temperature is low in the second defrosting mode, after the second defrosting mode condition is met, the air conditioning system 100 is likely to frost, the second defrosting mode is selected in the first defrosting mode, frostless defrosting of the air conditioning system 100 can be avoided, and further electric energy waste and loss of the air conditioning system 100 can be reduced.
In some embodiments of the present invention, as shown in fig. 4, the conditions of the first frost mode include the following a1-a 5:
a1: the first preset time is a first time value, and the first preset temperature is a first temperature value;
a2: the first preset time is a second time value, and the first preset temperature is a second temperature value;
a3: the first preset time is a third time value, and the first preset temperature is a third temperature value;
a4: the first preset time is a fourth time value, and the second preset temperature is a fourth temperature value;
a5: the first preset time is a fifth time value, the second preset temperature is a fifth temperature value, wherein the first time value is smaller than the second time value, the third time value is smaller than the third time value, the fourth time value is smaller than the fifth time value, and the first temperature value is larger than the second temperature value, the third temperature value is larger than the fourth temperature value, and the fifth temperature value is larger than the first temperature value. It is understood that the longer the first preset time, the higher the first preset temperature and the lower the second preset temperature, the more likely the air conditioning system 100 will frost. Wherein, when the air conditioning system 100 satisfies any one of the conditions a1 to a5, the air conditioning system 100 enters the first defrosting mode.
Further, as shown in fig. 4, the first time value may be (25-40) min, the first temperature value may be (0.5-7) ° c, the second time value may be (30-60) min, the second temperature value may be (0.5-7) ° c, the third time value may be (40-80) min, the third temperature value may be (0.5-7) ° c, the fourth time value may be (30-120) min, the fourth temperature value may be (-5-0) ° c, the fifth time value may be (80-200) min, and the fifth temperature value may be-15 ℃. The value ranges are optimal value ranges, but the value ranges meet the requirements that the first time value is less than the second time value, less than the third time value, less than the fourth time value and less than the fifth time value, and the first temperature value is greater than the second temperature value, greater than the third temperature value, greater than the fourth temperature value and greater than the fifth temperature value. Therefore, the accuracy of judging whether the air conditioning system 100 frosts can be improved, the probability of frostless defrosting can be reduced, and the waste of electric energy and the loss of the air conditioning system 100 caused by frostless defrosting can be further reduced.
For example, the first time value may be 29min, the first temperature value may be 3 ℃, the second time value may be 40min, the second temperature value may be 2 ℃, the third time value may be 50min, the third temperature value may be 1 ℃, the fourth time value may be 90min, the fourth temperature value may be-3 ℃, the fifth time value may be 120min, and the fifth temperature value may be-15 ℃.
As shown in fig. 3-4, according to some embodiments of the present invention, the heater 180 may be a regenerator, and each of conditions a1 through a5 further needs to satisfy T6 being equal to or greater than a fourth preset temperature, where T6 is the temperature of the heater 180. Since the heater 180 is a part for vaporizing the refrigerant when the air conditioning system 100 defrosts, when the T6 satisfies a fourth preset temperature or higher, the heater 180 may more stably operate, and the defrosting efficiency may be improved. Further, the fourth preset temperature may be (20-100) deg.C. Wherein, the temperature of (20-100) DEG C is an optimal interval of the value of the fourth preset temperature, and the fourth preset temperature in the temperature interval of (20-100) DEG C can improve the working efficiency of the heater 180, thereby improving the defrosting efficiency. Alternatively, the temperature T6 of the regenerator may be 60 ℃.
As shown in fig. 4, according to some embodiments of the present invention, in condition a4, the second preset temperature duration needs to be satisfied for a third preset time, so that the accuracy of determining the frosting of the air conditioning system 100 may be increased. Further, the third preset time may be 3min, and taking 3min as the optimal third preset time may further improve accuracy of frost judgment on the air conditioning system 100, and may reduce probability of frost free defrosting.
In some embodiments of the present invention, the heat accumulator includes a casing, heat exchange tubes, a heat storage medium, and a heating device, the heat exchange tubes are distributed at two ends of the casing in the length direction, the heat storage medium is filled between the heat exchange tubes, and the heating device is disposed in the heat storage medium to heat the heat storage medium, so that the heat storage medium can transfer heat to the heat exchange tubes to facilitate vaporization of a refrigerant in the heat exchange tubes. Moreover, the heat storage medium can also absorb the residual heat generated when the compressor 110 operates, so that the efficiency of the heating device can be reduced, and the electric energy can be saved.
In some embodiments of the present invention, as shown in fig. 4, the conditions of the second frost mode include the following B1-B4:
b1: the second preset time is a sixth time value, the third preset temperature is a sixth temperature value, and T30-T3 is greater than or equal to a tenth temperature value;
b2: the second preset time is a seventh time value, the third preset temperature is a seventh temperature value, and T30-T3 is greater than or equal to an eleventh temperature value;
b3: the second preset time is an eighth time value, and the third preset temperature is an eighth temperature value;
b4: the second preset time is a ninth time value, the third preset temperature is a ninth temperature value,
the sixth time value is less than the eighth time value and less than the seventh time value and less than the ninth time value, the eighth temperature value is greater than the ninth temperature value and greater than the sixth temperature value and greater than the seventh temperature value, and the eleventh temperature value is greater than the tenth temperature value. When the continuous heating time of the compressor 110 reaches the second preset time and T3 is lower than the third preset temperature, frosting may occur in the air conditioning system 100, and through experimental verification, the second preset time and the third preset temperature may have a one-to-one corresponding numerical range, so that the accuracy of determining whether the air conditioning system 100 frosts may be increased. Here, the sixth time value corresponds to a sixth temperature value, the seventh time value corresponds to a seventh temperature value, the eighth time value corresponds to an eighth temperature value, and the ninth time value corresponds to a ninth temperature value. In the condition B1, the comparison between the T30-T3 and the tenth temperature value is added, so that whether the air conditioning system 100 frosts can be further judged, and in the condition B2, the comparison between the T30-T3 and the eleventh temperature value is added, and similarly, whether the air conditioning system 100 frosts can be further judged.
Wherein, when the air conditioning system 100 satisfies any one of the conditions B1 through B4, the air conditioning system 100 enters the second defrosting mode.
Further, the sixth time value can be (25-40) min, the sixth temperature value can be [ (-10) - (-5) ], and the tenth temperature value can be 1.5 ℃; the seventh time value can be (30-60) min, the seventh temperature value can be [ (-10) -0] ° c, the eleventh temperature value can be 3 ℃; the eighth time value can be (25-40) min, and the eighth temperature value can be [ (-25) - (-15) ]; the ninth time value can be (80-200) min, and the ninth temperature value can be [ (-20) - (-10) ].
The value ranges are optimal value ranges, but the values in the value ranges meet the requirements that the sixth time value is equal to the eighth time value less than the seventh time value less than the ninth time value, the eighth temperature value is greater than the ninth temperature value and is greater than the sixth temperature value and is greater than the seventh temperature value, and the eleventh temperature value is greater than the tenth temperature value. Therefore, the accuracy of judging whether the air conditioning system 100 frosts can be improved, the probability of frostless defrosting can be reduced, and the waste of electric energy and the loss of the air conditioning system 100 caused by frostless defrosting can be further reduced.
For example, the sixth time value may be 29min, the sixth temperature value may be-7 ℃, and the tenth temperature value may be 1.5 ℃; the seventh time value may be 35min, the seventh temperature value may be-5 ℃, and the eleventh temperature value may be 3 ℃; the eighth time value can be 29min, and the eighth temperature value can be-24 ℃; the ninth time value may be 120min and the ninth temperature value may be-15 ℃.
As shown in fig. 4, according to some embodiments of the present invention, in the condition B3, the third preset temperature duration needs to be satisfied for the fourth preset time, so that the accuracy of determining the frosting of the air conditioning system 100 may be increased. Further, the fourth preset time may be 3min, and taking 3min as the optimal fourth preset time may further improve accuracy of frost judgment on the air conditioning system 100, and may reduce probability of frost free.
In some embodiments of the present invention, as shown in fig. 4, a first temperature sensor is disposed on the heater 180, a second temperature sensor is disposed at an inlet of the outdoor heat exchanger 150, when the air conditioning system 100 runs through the defrosting mode, before determining whether a condition of the first defrosting mode is satisfied, it is determined whether the first temperature sensor and the second temperature sensor are failed,
if one of the first temperature sensor and the second temperature sensor has a fault, wherein the first temperature sensor may have a fault, the second temperature sensor may have a fault, or both the first temperature sensor and the second temperature sensor may have faults, directly judging whether the air conditioning system 100 meets the condition of the second defrosting mode, operating the second defrosting mode when the condition of the second defrosting mode is met, and continuing heating operation when the condition of the second defrosting mode is not met;
if neither the first temperature sensor nor the second temperature sensor has a fault, it is determined whether the air conditioning system 100 satisfies the condition of the first defrosting mode.
It is understood that the first temperature sensor may be used to measure the temperature T6 of the heater, the second temperature sensor may be used to measure the inlet temperature T5 of the outdoor heat exchanger 150, and the condition of entering the first defrosting mode may be determined when the first defrosting mode is entered, and the condition of the first defrosting mode may be measured by measuring the temperature T6 of the heater 180 and the inlet temperature T5 of the outdoor heat exchanger 150, and when one of the first temperature sensor and the second temperature sensor fails, the first defrosting mode is disabled, and the air conditioning system 100 directly determines the condition of entering the second defrosting mode. When neither the first temperature sensor nor the second temperature sensor has a fault, the air conditioning system 100 preferentially determines the first defrosting mode condition.
As shown in fig. 4, according to some embodiments of the present invention, when the defrosting operation is performed in the first defrosting mode, it is determined whether one of the following three end conditions is satisfied,
c1: t5 is greater than or equal to the twelfth temperature value;
c2: t5 is greater than or equal to a thirteenth temperature value, the defrosting duration time reaches a ninth preset time, and the thirteenth temperature value is less than a twelfth temperature value;
c3: the defrosting lasts for a fifth preset time, the fifth preset time is longer than the ninth preset time,
wherein, when the air conditioning system 100 satisfies any one of the conditions C1-C3, the air conditioning system 100 exits the first defrosting mode. In C1, a twelfth temperature value is set through experimental verification, and when T5 is greater than or equal to the twelfth temperature value, it can be determined that the air conditioning system 100 is more likely to complete defrosting; in C2, a test verifies that a thirteenth temperature value is set, and when T5 is greater than or equal to the thirteenth temperature value and the current defrosting duration reaches a ninth preset time, it can be determined that the air conditioning system 100 is likely to complete defrosting, and since a time condition that the current defrosting duration reaches the ninth preset time is added, the value of the thirteenth temperature value can be smaller than the twelfth temperature value; in C3, it may be determined that the air conditioning system 100 is more likely to complete defrosting if the defrosting time lasts for a fifth preset time, the fifth preset time may be set to be longer, and the fifth preset time may be longer than the ninth preset time.
Further, the twelfth temperature value may be (4-15) ° c, the thirteenth temperature value may be (2-6) ° c, the ninth preset time may be 40s, and the fifth preset time may be (2-10) min. The value ranges are optimal value ranges, the values of the twelfth temperature value, the thirteenth temperature value, the ninth preset time and the fifth preset time can accurately judge whether the air conditioning system 100 is defrosted, and if defrosting is finished, the first defrosting mode can be quitted in time, so that electric energy can be saved, and waste is reduced.
For example, the twelfth temperature value may be 6 ℃, the thirteenth temperature value may be 4 ℃, the ninth preset time may be 40s, and the fifth preset time may be 4 min.
As shown in fig. 4, according to some embodiments of the present invention, when the defrosting operation is performed in the second defrosting mode, it is determined whether one of the following three end conditions is satisfied,
d1: t3 is greater than or equal to the fourteenth temperature value;
d2: t3 is greater than or equal to a fifteenth temperature value, the defrosting operation is continuously operated for a seventh preset time, and the fourteenth temperature value is greater than the fifteenth temperature value;
d3: the defrosting operation is continuously operated for a sixth preset time, the sixth preset time is longer than the seventh preset time,
wherein the air conditioning system 100 exits the second defrost mode when the air conditioning system 100 satisfies any one of the conditions D1 through D3. In D1, experiments prove that a fourteenth temperature value is set, and when T3 is greater than or equal to the fourteenth temperature value, it can be determined that the air conditioning system 100 is more likely to complete defrosting; in D2, a test verifies that a fifteenth temperature value is set, and when T3 is greater than or equal to the fifteenth temperature value and the current defrosting duration reaches a seventh preset time, it can be determined that the air conditioning system 100 is likely to complete defrosting, and since a time condition that the current defrosting duration reaches the seventh preset time is added, the value of the fifteenth temperature value can be smaller than the fourteenth temperature value; in D3, it may be determined that the air conditioning system 100 is more likely to complete defrosting if the defrosting time lasts for a sixth preset time, where the sixth preset time may be set to be longer and may be longer than the seventh preset time.
Furthermore, the fourteenth temperature value is (4-15) ° c, the fifteenth temperature value is (2-10) ° c, the seventh preset time is 80s, and the sixth preset time is (5-20) min. The value ranges are optimal value ranges, the values of the fourteenth temperature value, the fifteenth temperature value, the seventh preset time and the sixth preset time can accurately judge whether the air conditioning system 100 is defrosted, and the second defrosting mode can be quitted in time if the defrosting is finished, so that electric energy can be saved, and waste is reduced.
For example, the fourteenth temperature value is 14 ℃, the fifteenth temperature value is 8 ℃, the seventh preset time is 80s, and the sixth preset time is 15 min.
In some embodiments of the present invention, as shown in fig. 5, after the first frost mode operates for two periods, it is determined whether the operating time of two consecutive first frost modes is less than an eighth preset time, and T5 is less than or equal to a fifth preset temperature,
if yes, directly judging whether the air conditioning system 100 meets the conditions of the second defrosting mode, operating the second defrosting mode when the conditions of the second defrosting mode are met, and continuing heating operation when the conditions of the second defrosting mode are not met;
if not, whether the air conditioning system 100 meets the condition of the first defrosting mode is judged.
It can be understood that when the operation time of the two consecutive first defrosting modes is less than the eighth preset time and T5 is less than or equal to the fifth preset temperature, it may be predicted that the defrosting effect of the first defrosting mode decreases, at this time, the second defrosting mode may be switched to defrost, and the condition of the second defrosting mode may be determined before the second defrosting mode is switched.
Further, the eighth preset time may be (2-10) min, and the fifth preset temperature may be (0-8) ° c. The value range is the optimal value range, the value of the eighth preset time is (2-10) min, and the value of the fifth preset temperature is (0-8) DEG C, so that whether the defrosting effect of the first defrosting mode is reduced or not can be judged more accurately, and more accurate judgment can be provided for whether the second defrosting mode is operated or not. For example, the eighth preset time may be 4min, and the fifth preset temperature may be 2 ℃.
As shown in fig. 4, according to some embodiments of the present invention, when determining whether the air conditioning system 100 satisfies the condition of the first defrosting mode, if not, the heating operation is continued or whether the condition of the second defrosting mode is satisfied. It is understood that when the condition of the first defrosting mode is not satisfied, there is a high possibility that the air conditioning system 100 is frostless, and at this time, the air conditioning system 100 continues the heating operation. Or, when the condition of the first defrosting mode is not satisfied, in order to further determine whether the air conditioning system 100 is frosted, the condition of the second defrosting mode may be determined, if yes, the second defrosting mode is entered, and if not, the air conditioning system 100 continues heating operation.
As shown in fig. 1 to 3, according to an air conditioning system 100 according to an embodiment of the present invention, the air conditioning system 100 controls defrosting using the control method of the air conditioning system 100 as described above, and the air conditioning system 100 includes: a compressor 110, a reversing device 120, an indoor heat exchanger 130, an outdoor heat exchanger 150, a throttling device 140, a first parallel bypass 160, a second parallel bypass 170, a heater 180, and a control assembly 190. The compressor 110, the reversing device 120, the indoor heat exchanger 130, the throttling device 140 and the outdoor heat exchanger 150 form a main loop. The refrigerant circularly flows in the main loop to cool or heat the air conditioning system 100; the compressor 110, the reversing device 120, the indoor heat exchanger 130, the outdoor heat exchanger 150, the first parallel bypass 160, the second parallel bypass 170, the heater 180 and the control assembly 190 form a defrosting loop, and refrigerant circularly flows in the defrosting loop to defrost the air conditioning system 100.
As shown in fig. 1 to 3, the reversing device 120 has a first valve port 121, a second valve port 122, a third valve port 123 and a fourth valve port 124, the first valve port 121 is connected to the exhaust port 111 of the compressor 110, the second valve port 122 is connected to the return port 112 of the compressor 110, the third valve port 123 is connected to one end of the indoor heat exchanger 130, the other end of the indoor heat exchanger 130 is connected to one end of the throttling device 140, the fourth valve port 124 is connected to one end of the outdoor heat exchanger 150, the other end of the outdoor heat exchanger 150 is connected to the other end of the throttling device 140, and the reversing device 120 switches the first valve port 121 to be in communication with one of the third valve port 123 and the fourth valve port 124, and switches the second valve port 122 to be in communication with the other of the third valve port 123 and the fourth valve port 124. Therefore, the reversing device 120 can control the circulating flow direction of the refrigerant flowing out of the compressor 110, that is, the discharge port 111 of the compressor 110 is connected to the indoor heat exchanger 130, and the return port 112 of the compressor 110 is connected to the outdoor heat exchanger 150 to achieve the heating effect, or the discharge port 111 of the compressor 110 is connected to the outdoor heat exchanger 150, and the return port 112 of the compressor 110 is connected to the indoor heat exchanger 130 to achieve the cooling effect.
As shown in fig. 3, the first parallel bypass 160 is connected in parallel with the first pipe 200 in which the throttling device 140 is located, the second parallel bypass 170 is connected in parallel with the second pipe 210 connected between the second valve port 122 and the return air port 112, the heater 180 is connected in series with the second parallel bypass 170, the control unit 190 controls the on/off of the first parallel bypass 160 and the on/off of the second parallel bypass 170, the air conditioning system 100 has a first defrosting mode for defrosting operation, in which the first parallel bypass 160 and the second parallel bypass 170 are respectively connected, the first valve port 121 is connected with the third valve port 123, and the second valve port 122 is connected with the fourth valve port 124. When the air conditioning system 100 performs a defrosting operation, the refrigerant flows out of the compressor 110, passes through the indoor heat exchanger 130, flows into the first parallel bypass 160, flows into the outdoor heat exchanger 150, flows into the second parallel bypass 170, flows into the heater 180, and flows back to the compressor 110 through the heater 180 to form a circulating flow of the refrigerant. Here, the refrigerant is liquefied and released in both the indoor heat exchanger 130 and the outdoor heat exchanger 150, and thus frost formed on the outdoor heat exchanger 150 can be melted.
According to the air conditioning system 100 of the embodiment of the invention, whether the air conditioning system 100 runs the defrosting mode is judged, if yes, whether the air conditioning system 100 meets the condition of the first defrosting mode is judged, and when the condition of the first defrosting mode is met, the air conditioning system 100 is controlled to run the first defrosting mode; if not, whether the air conditioning system 100 meets the conditions of the second defrosting mode is judged, and when the conditions of the second defrosting mode are met, the air conditioning system 100 is controlled to operate the second defrosting mode. Because the third preset temperature is low in the second defrosting mode, after the second defrosting mode condition is met, the air conditioning system 100 is likely to frost, the second defrosting mode is selected in the first defrosting mode, frostless defrosting of the air conditioning system 100 can be avoided, and further electric energy waste and loss of the air conditioning system 100 can be reduced.
In some embodiments of the present invention, the control assembly 190 can also adjust the refrigerant flow distribution of the first parallel bypass 160 and the first pipeline 200, and/or adjust the refrigerant flow distribution of the second parallel bypass 170 and the second pipeline 210. Therefore, when the defrosting mode is operated, the control assembly 190 can control a large amount of refrigerant to flow into the first parallel bypass 160 and the second parallel bypass 170, so that the defrosting effect can be enhanced, and the defrosting efficiency is improved.
In some embodiments of the present invention, the control assembly 190 includes a first control valve, which may be an electric two-way valve provided on the first parallel bypass 160, and a second control valve, which may be an electric three-way valve provided at a position where the second parallel bypass 170 and the second pipe 210 are branched in parallel or merged in parallel. The electric two-way valve and the electric three-way valve can more efficiently control the distribution of the refrigerant circulation, and the working efficiency of the defrosting loop can be improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (22)

1. A control method of an air conditioning system, characterized in that the air conditioning system comprises: the air conditioning system also comprises a first parallel bypass, a second parallel bypass, a heater and a control assembly, wherein the first parallel bypass is connected with a first pipeline where the throttling device is located in parallel, the second parallel bypass is connected with a second pipeline connected between the reversing device and an air return port of the compressor in parallel, the heater is connected with the second parallel bypass in series, the control assembly controls the on-off of the first parallel bypass and the on-off of the second parallel bypass,
the control method comprises the following steps:
controlling the heating operation of the air conditioning system;
judging whether the air conditioning system runs in a defrosting mode or not;
if so, judging whether the air-conditioning system meets the condition of a first defrosting mode, and controlling the air-conditioning system to operate the first defrosting mode when the condition of the first defrosting mode is met;
if not, judging whether the air conditioning system meets the condition of a second defrosting mode, and controlling the air conditioning system to operate the second defrosting mode when the condition of the second defrosting mode is met;
wherein, in the first defrosting mode, the compressor is controlled to work, the first parallel bypass and the second parallel bypass are controlled to be respectively communicated, the reversing device controls the air outlet of the compressor to be communicated with the indoor heat exchanger, the air return port of the compressor is communicated with the outdoor heat exchanger, in the second defrosting mode, the compressor is controlled to work, the throttling device works, the first parallel bypass and the second parallel bypass are respectively disconnected, the reversing device controls the air outlet of the compressor to be communicated with the outdoor heat exchanger, and the air return port of the compressor is communicated with the indoor heat exchanger,
the first defrosting mode is carried out under the conditions that whether the continuous heating time reaches a first preset time or not is judged, whether T30-T5 is greater than or equal to a first preset temperature or not and whether T3 is lower than one of second preset temperatures or not is judged, wherein T5 is the temperature of an inlet of the outdoor heat exchanger, T30 is the lowest temperature value of an outlet of the outdoor heat exchanger in a period of time set before the current running state of the outdoor heat exchanger, and T3 is the temperature of the outlet of the outdoor heat exchanger;
and the second defrosting mode is set to judge whether the continuous heating time of the compressor reaches a second preset time and whether T3 is lower than a third preset temperature.
2. The control method of an air conditioning system according to claim 1,
a1: the first preset time is a first time value, and the first preset temperature is a first temperature value;
a2: the first preset time is a second time value, and the first preset temperature is a second temperature value;
a3: the first preset time is a third time value, and the first preset temperature is a third temperature value;
a4: the first preset time is a fourth time value, and the second preset temperature is a fourth temperature value;
a5: the first preset time is a fifth time value, the second preset temperature is a fifth temperature value, wherein the first time value is less than the second time value, less than the third time value, less than the fourth time value and less than the fifth time value, and the first temperature value is greater than the second temperature value, greater than the third temperature value, greater than the fourth temperature value and greater than the fifth temperature value;
wherein the air conditioning system enters the first defrost mode when the air conditioning system satisfies any one of conditions A1 through A5.
3. The control method of an air conditioning system according to claim 2, wherein the first time value is (25-40) min, the first temperature value is (0.5-7) ° c, the second time value is (30-60) min, the second temperature value is (0.5-7) ° c, the third time value is (40-80) min, the third temperature value is (0.5-7) ° c, the fourth time value is (30-120) min, the fourth temperature value is (-5-0) ° c, the fifth time value is (80-200) min, and the fifth temperature value is-15 ℃.
4. The control method of an air conditioning system according to claim 2, wherein the heater is a heat accumulator, and in a1 through a5, each condition further requires that T6 be equal to or greater than a fourth preset temperature, where T6 is a temperature of the heater.
5. The control method of an air conditioning system according to claim 4, wherein the fourth preset temperature is (20-100) ° C.
6. The control method of an air conditioning system according to claim 2, wherein in condition a4, the second preset temperature duration needs to be satisfied for a third preset time.
7. The control method of an air conditioning system according to claim 6, wherein the third preset time is 3 min.
8. The control method of an air conditioning system according to claim 1,
b1: the second preset time is a sixth time value, the third preset temperature is a sixth temperature value, and T30-T3 is greater than or equal to a tenth temperature value;
b2: the second preset time is a seventh time value, the third preset temperature is a seventh temperature value, and T30-T3 is greater than or equal to an eleventh temperature value;
b3: the second preset time is an eighth time value, and the third preset temperature is an eighth temperature value;
b4: the second preset time is a ninth time value, the third preset temperature is a ninth temperature value,
the sixth time value is less than the eighth time value and less than the seventh time value and less than the ninth time value, the eighth temperature value is greater than the ninth temperature value and greater than the sixth temperature value and greater than the seventh temperature value, and the eleventh temperature value is greater than the tenth temperature value;
wherein the air conditioning system enters the second defrost mode when the air conditioning system satisfies any one of conditions B1 through B4.
9. The control method of an air conditioning system according to claim 8, wherein the sixth time value is (25-40) min, the sixth temperature value is [ (-10) - (-5) ] C, the tenth temperature value is 1.5C,
the seventh time value is (30-60) min, the seventh temperature value is [ (-10) -0] ° c, the eleventh temperature value is 3 ℃,
the eighth time value is (25-40) min, the eighth temperature value is [ (-25) - (-15) ] ° C,
the ninth time value is (80-200) min, and the ninth temperature value is [ (-20) - (-10) ].
10. The control method of an air conditioning system according to claim 8, wherein in condition B3, the third preset temperature duration needs to be satisfied for a fourth preset time.
11. The control method of an air conditioning system according to claim 10, wherein the fourth preset time is 3 min.
12. The control method of the air conditioning system according to claim 1, wherein a first temperature sensor is provided on the heater, a second temperature sensor is provided at an inlet of the outdoor heat exchanger, when the air conditioning system runs through a defrosting mode, before determining whether a condition of a first defrosting mode is satisfied, it is determined whether the first temperature sensor and the second temperature sensor are failed,
if one of the first temperature sensor and the second temperature sensor has a fault, directly judging whether the air conditioning system meets the condition of a second defrosting mode, and running the second defrosting mode when the condition of the second defrosting mode is met;
and if the first temperature sensor and the second temperature sensor have no faults, judging whether the air conditioning system meets the condition of a first defrosting mode.
13. The control method of an air conditioning system according to claim 1, wherein when the defrosting operation is performed in the first defrosting mode, it is determined whether one of the following three end conditions is satisfied,
c1: t5 is greater than or equal to the twelfth temperature value;
c2: t5 is greater than or equal to a thirteenth temperature value, the defrosting duration time reaches a ninth preset time, and the thirteenth temperature value is less than a twelfth temperature value;
c3: the defrosting time lasts for a fifth preset time, the fifth preset time is longer than a ninth preset time,
wherein the air conditioning system exits the first defrost mode when the air conditioning system satisfies any one of conditions C1 through C3.
14. The control method of an air conditioning system according to claim 13, wherein the twelfth temperature value is (4-15) ° c, the thirteenth temperature value is (2-6) ° c, the ninth preset time is 40s, and the fifth preset time is (2-10) min.
15. The control method of an air conditioning system according to claim 1, wherein when the defrosting operation is performed in the second defrosting mode, it is determined whether one of the following three end conditions is satisfied,
d1: t3 is greater than or equal to the fourteenth temperature value;
d2: t3 is greater than or equal to a fifteenth temperature value, the defrosting operation is continuously operated for a seventh preset time, and the fourteenth temperature value is greater than the fifteenth temperature value;
d3: the defrosting operation is continuously operated for a sixth preset time, the sixth preset time is longer than the seventh preset time,
wherein the air conditioning system exits the second defrost mode when the air conditioning system satisfies any one of conditions D1 through D3.
16. The method as claimed in claim 15, wherein the fourteenth temperature value is (4-15) ° c, the fifteenth temperature value is (2-10) ° c, the seventh preset time is 80s, and the sixth preset time is (5-20) min.
17. The control method of an air conditioning system according to claim 1, wherein it is determined whether operation times of two consecutive first frost modes are both less than an eighth preset time and T5 is less than or equal to a fifth preset temperature after the first frost mode is operated for two periods,
if yes, directly judging whether the air conditioning system meets the condition of a second defrosting mode, and running the second defrosting mode when the condition of the second defrosting mode is met;
if not, judging whether the air conditioning system meets the condition of the first defrosting mode.
18. The control method of an air conditioning system according to claim 17, wherein the eighth preset time is (2-10) min, and the fifth preset temperature is (0-8) ° c.
19. The method of claim 1, wherein when determining whether the air conditioning system satisfies the condition of the first defrosting mode, if not, continuing the heating operation or determining whether the condition of the second defrosting mode is satisfied.
20. An air conditioning system characterized in that the air conditioning system controls defrosting using the control method of the air conditioning system according to any one of claims 1 to 19, the air conditioning system comprising: the air conditioner comprises a compressor, a reversing device, an indoor heat exchanger, an outdoor heat exchanger, a throttling device, a first parallel bypass, a second parallel bypass, a heater and a control assembly, wherein the reversing device is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with an exhaust port of the compressor, the second valve port is connected with a return air port of the compressor, the third valve port is connected with one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected with one end of the throttling device, the fourth valve port is connected with one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected with the other end of the throttling device, the reversing device switches the first valve port to be communicated with one of the third valve port and the fourth valve port and enables the second valve port to be communicated with the other of the third valve port and the fourth valve port, the first parallel bypass is connected in parallel with a first pipeline where the throttling device is located, the second parallel bypass is connected in parallel with a second pipeline connected between the second valve port and the air return port, the heater is connected in series with the second parallel bypass, the control assembly controls the on-off of the first parallel bypass and the on-off of the second parallel bypass, the air conditioning system has a first defrosting mode for defrosting operation, in the first defrosting mode, the first parallel bypass and the second parallel bypass are respectively communicated, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port.
21. The system of claim 20, wherein the control assembly is further configured to adjust a refrigerant flow distribution of the first parallel bypass and the first conduit, and/or adjust a refrigerant flow distribution of the second parallel bypass and the second conduit.
22. The air conditioning system as claimed in claim 21, wherein the control assembly includes a first control valve and a second control valve, the first control valve being an electric two-way valve provided on the first parallel bypass, and the second control valve being an electric three-way valve provided at a position where the second parallel bypass and the second pipe are branched in parallel or a position where the second parallel bypass and the second pipe are merged in parallel.
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