CN104729029A - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN104729029A
CN104729029A CN201310724213.4A CN201310724213A CN104729029A CN 104729029 A CN104729029 A CN 104729029A CN 201310724213 A CN201310724213 A CN 201310724213A CN 104729029 A CN104729029 A CN 104729029A
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CN
China
Prior art keywords
closed circuit
heat exchanger
valve
invariable frequency
frequency compressor
Prior art date
Application number
CN201310724213.4A
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Chinese (zh)
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CN104729029B (en
Inventor
李毛古
李志强
汪俊勇
曹勇
何国军
周凤
王磊
聂旺辉
刘志孝
Original Assignee
珠海格力电器股份有限公司
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Priority to CN201310724213.4A priority Critical patent/CN104729029B/en
Publication of CN104729029A publication Critical patent/CN104729029A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/025Compressor control by controlling speed
    • F25B2600/0251Compressor control by controlling speed with on-off operation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides an air conditioning system and a control method thereof. The air conditioning system comprises a first circulation loop, a second circulation loop and a controller, the first circulation loop comprises a first invariable frequency compressor, an indoor heat exchanger, a first electronic expansion valve and an outdoor heat exchanger. The second circulation loop comprises a second invariable frequency compressor, the indoor heat exchanger, a second electronic expansion valve and the outdoor heat exchanger, a pipeline of the indoor heat exchanger comprises a heat exchange tube stack and a second heat exchange tube stack which are arranged in parallel, a pipeline of the outdoor heat exchanger comprises a third heat exchange tube stack and a fourth heat exchange tube stake which are arranged in parallel, the first circulation loop is communicated with the first heat exchange tube stack and the third heat exchange tube stack, the second circulation loop is communicated with the second heat exchange tube stack and the fourth heat exchange tube stack, and the controller is used for detecting a difference value between indoor temperature and preset temperature and controlling turning-on and turning-off of the first circulation loop and the second circulation loop. The air conditioning system and the control method have the advantages that power consumption is reduced, heating during frosting is achieved, and comfort of a room is guaranteed.

Description

Air-conditioning system and control method thereof
Technical field
The present invention relates to field of air conditioning, especially, relate to a kind of air-conditioning system and control method thereof.
Background technology
In prior art, be the difference by environment temperature and design temperature, control startup and the stopping of compressor.But for invariable frequency compressor, when the difference comparsion hour of design temperature and environment temperature, refrigeration duty needed for room reduces, and compressor still with certain rotation speed operation, can compare room load, and compressor remains higher power stage, and power consumption also increases; Heat pump air conditioner is when defrost, and indoor becomes evaporation section, for preventing air-conditioning to blows cold wind indoors, can only stop inner blower, and in defrost process, room temperature declines, and has influence on thermal comfort; Also the air-conditioning had can add auxiliary electrical heater, but its heat provided can not maintain normal comfortableness, and the device exposed exists potential safety hazard, and auxiliary electrical heater is shorter for service life.
Summary of the invention
The object of the invention is to provide a kind of air-conditioning system and control method thereof, to solve the technical problem that when design temperature differs less with environment temperature, air-conditioning power consumption is large.
For achieving the above object, the invention provides a kind of air-conditioning system, comprise the first closed circuit and the second closed circuit, the first closed circuit comprises the first invariable frequency compressor, indoor heat exchanger, the first electric expansion valve and outdoor heat exchanger; Second closed circuit comprises the second invariable frequency compressor, indoor heat exchanger, the second electric expansion valve and outdoor heat exchanger; The pipeline of indoor heat exchanger comprises the first parallel set of heat exchange tubes and the second set of heat exchange tubes; The pipeline of outdoor heat exchanger comprises the 3rd parallel set of heat exchange tubes and the 4th set of heat exchange tubes; First closed circuit is connected with the 3rd set of heat exchange tubes with the first set of heat exchange tubes; Second closed circuit is connected with the 4th set of heat exchange tubes with the second set of heat exchange tubes; Controller, detects the difference of indoor environment temperature and design temperature, controls the opening and closing of the first closed circuit and the second closed circuit.
Further, the first closed circuit comprises the first cross valve, and the second closed circuit comprises the second cross valve, and the first interface of the first cross valve is connected with the outlet of the first invariable frequency compressor; Second interface of the first cross valve is connected with the first end of outdoor heat exchanger; 3rd interface of the first cross valve is connected with the entrance of the first invariable frequency compressor; 4th interface of the first cross valve is connected with the first end of indoor heat exchanger; Second end of outdoor heat exchanger is connected with the second end of indoor heat exchanger; First closed circuit also comprises the first defrost branch road, and the first end of the first defrost branch road is connected with the entrance of the first invariable frequency compressor, and the second end of the first defrost branch road is connected with the second end of outdoor heat exchanger; The first interface of the second cross valve is connected with the outlet of the second invariable frequency compressor; Second interface of the second cross valve is connected with the 3rd end of outdoor heat exchanger; 3rd interface of the second cross valve is connected with the entrance of the second invariable frequency compressor; 4th interface of the second cross valve is connected with the 3rd end of indoor heat exchanger; 4th end of outdoor heat exchanger is connected with the 4th end of indoor heat exchanger; Second closed circuit also comprises the second defrost branch road, and the first end of the first defrost branch road is connected with the entrance of the second invariable frequency compressor, and the second end of the second defrost branch road is connected with the 4th end of outdoor heat exchanger; Inlet side and the air side place of indoor heat exchanger are provided with temperature sensor; The inlet side of outdoor heat exchanger and the 3rd set of heat exchange tubes and the 4th set of heat exchange tubes place are provided with temperature sensor.
Further, the first vapour liquid separator is provided with between the 3rd interface of the first cross valve and the entrance of the first invariable frequency compressor; The second vapour liquid separator is provided with between 3rd interface of the second cross valve and the entrance of the second invariable frequency compressor.
Further, the first check valve is provided with between the 3rd interface of the first cross valve and the first vapour liquid separator; 3rd interface of the second cross valve and the second vapour liquid separator are provided with the second check valve.
Further, in the first defrost branch road, be provided with the first magnetic valve, in the second defrost branch road, be provided with the second magnetic valve.
Further, the 3rd magnetic valve is provided with between the first electric expansion valve and the first set of heat exchange tubes; The 4th magnetic valve is provided with between second electric expansion valve and the second set of heat exchange tubes.
Further, the first set of heat exchange tubes and the second set of heat exchange tubes are arranged alternately.
Further, the first half of the 3rd set of heat exchange tubes heat exchanger disposed in the outdoor, the latter half of the 4th set of heat exchange tubes heat exchanger disposed in the outdoor.
Present invention also offers a kind of control method of air-conditioning system, air-conditioning system before control, detect the difference of indoor environment temperature and design temperature, when difference reaches preset range, one or two in controller selection unlatching first closed circuit and the second closed circuit.
Further, under refrigeration mode, when difference > first design temperature of indoor temperature and design temperature, the first invariable frequency compressor and the second invariable frequency compressor are opened simultaneously;
When indoor temperature and design temperature difference > 0 DEG C and when being less than or equal to the first design temperature, judge the total run time of the first invariable frequency compressor and the second invariable frequency compressor, open less compressor running time.
Further, under heating mode, when outdoor environment temperature be more than or equal to the second design temperature and difference > first design temperature of indoor temperature and design temperature time, the first invariable frequency compressor and the second invariable frequency compressor are opened simultaneously;
When outdoor environment temperature is less than the second design temperature, both open, the first invariable frequency compressor and the second invariable frequency compressor are opened simultaneously.
Further, carry out defrost operation in a heating mode, first judge the running status of the first invariable frequency compressor and the second invariable frequency compressor; If the first invariable frequency compressor and the second invariable frequency compressor are all in operation, whether the closed circuit detecting the first invariable frequency compressor and the second invariable frequency compressor place reaches defrost condition, wherein any one closed circuit reaches defrost condition, then make this closed circuit reaching defrost condition carry out defrost operation, another closed circuit carries out heating operation; After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation.
Further, if the first invariable frequency compressor and one of them compressor of the second invariable frequency compressor are in operation, whether the closed circuit detecting the compressor place run reaches defrost condition, and carry out defrost operation after reaching defrost condition, another compressor place closed circuit carries out heating operation; After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation, and the closed circuit carrying out heating operation when defrost runs is closed.
The present invention has following beneficial effect:
By using two closed circuits, share indoor heat exchanger and outdoor heat exchanger, design temperature and environment temperature less time, use a compressor operating, reduce the output of cold, reduce the power consumption of air-conditioning, and air-conditioning still can heat when defrost, ensure the comfortableness in room.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to air-conditioning system of the present invention;
Fig. 2 flows to schematic diagram according to the refrigerant of air-conditioning system of the present invention;
Fig. 3 is the schematic diagram of the first closed circuit defrost according to air-conditioning system of the present invention;
Fig. 4 is the schematic diagram of the second closed circuit defrost according to air-conditioning system of the present invention;
Fig. 5 is the schematic diagram of the indoor heat exchanger set of heat exchange tubes according to air-conditioning system of the present invention;
Fig. 6 is the intention shown according to the outdoor heat exchanger set of heat exchange tubes of air-conditioning system of the present invention; And
Fig. 7 is the defrosting control schematic flow sheet according to air conditioner system control method of the present invention.
Reference numeral in accompanying drawing is as follows: 11, the first invariable frequency compressor; 12, the second invariable frequency compressor; 21, the first cross valve; 22, the second cross valve; 30, indoor heat exchanger; 31, the first set of heat exchange tubes; 32, the second set of heat exchange tubes; 40, outdoor heat exchanger; 41, the 3rd set of heat exchange tubes; 42, the 4th set of heat exchange tubes; 51, the first electric expansion valve; 52, the second electric expansion valve; 61, the first vapour liquid separator; 62, the second vapour liquid separator; 71, the first check valve; 72, the second check valve; 81, the first magnetic valve; 82, the second magnetic valve; 83, the 3rd magnetic valve; 84, the 4th magnetic valve, 90, temperature sensor.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
See Fig. 1 to Fig. 6, according to air-conditioning system of the present invention, comprise the first closed circuit and the second closed circuit, the first closed circuit comprises the first invariable frequency compressor 11, indoor heat exchanger 30, first electric expansion valve 51 and outdoor heat exchanger 40; Second closed circuit comprises the second invariable frequency compressor 12, indoor heat exchanger 30, second electric expansion valve 52 and outdoor heat exchanger 40; The pipeline of indoor heat exchanger 30 comprises the first parallel set of heat exchange tubes 31 and the second set of heat exchange tubes 32; The pipeline of outdoor heat exchanger 40 comprises the 3rd parallel set of heat exchange tubes 41 and the 4th set of heat exchange tubes 42; First closed circuit is connected with the 3rd set of heat exchange tubes 41 with the first set of heat exchange tubes 31; Second closed circuit is connected with the 4th set of heat exchange tubes 42 with the second set of heat exchange tubes 32; Controller, detects the difference of indoor environment temperature and design temperature, controls the opening and closing of the first closed circuit and the second closed circuit.By using two closed circuits, sharing indoor heat exchanger and outdoor heat exchanger, when design temperature and environment temperature are less, use a compressor operating, reduce the power consumption of air-conditioning, and air-conditioning still can heat when defrost, the comfortableness in guarantee room.
See Fig. 1 to Fig. 6, the first closed circuit comprises the first invariable frequency compressor 11, first cross valve 21, indoor heat exchanger 30 and outdoor heat exchanger 40; The first interface of the first cross valve 21 is connected with the outlet of the first invariable frequency compressor 11; Second interface of the first cross valve 21 is connected with the first end of outdoor heat exchanger 40; 3rd interface of the first cross valve 21 is connected with the entrance of the first invariable frequency compressor 11; 4th interface of the first cross valve 21 is connected with the first end of indoor heat exchanger 30; Second end of outdoor heat exchanger 40 is connected with the second end of indoor heat exchanger 30; First closed circuit also comprises the first defrost branch road, and the first end of the first defrost branch road is connected with the entrance of the first invariable frequency compressor 11, and the second end of the first defrost branch road is connected with the second end of outdoor heat exchanger 40; Second closed circuit comprises the second invariable frequency compressor 12, second cross valve 22 indoor heat exchanger 30 and outdoor heat exchanger 40; The first interface of the second cross valve 22 is connected with the outlet of the second invariable frequency compressor 12; Second interface of the second cross valve 22 is connected with the 3rd end of outdoor heat exchanger 40; 3rd interface of the second cross valve 22 is connected with the entrance of the second invariable frequency compressor 12; 4th interface of the second cross valve 22 is connected with the 3rd end of indoor heat exchanger 30; 4th end of outdoor heat exchanger 40 is connected with the 4th end of indoor heat exchanger 30; Second closed circuit also comprises the second defrost branch road, and the first end of the first defrost branch road is connected with the entrance of the second invariable frequency compressor 12, and the second end of the second defrost branch road is connected with the 4th end of outdoor heat exchanger 40; Inlet side and the air side place of indoor heat exchanger 30 are provided with temperature sensor 90; The inlet side of outdoor heat exchanger 40 and outdoor heat exchanger refrigerant line i.e. the 3rd set of heat exchange tubes 41 and the 4th set of heat exchange tubes 42 place are provided with temperature sensor 90.
See Fig. 1 to Fig. 6, the first invariable frequency compressor 11 is identical with the rated discharge amount of the second invariable frequency compressor 12.Air-conditioning system has two independently refrigerant circulation circuit, and two closed circuits share outdoor heat exchanger 40 and indoor heat exchanger 30; Indoor heat exchanger adopts an inner blower, and outdoor heat exchanger adopts about two to arrange outer blower fan.
See Fig. 1 to Fig. 6, the second end of outdoor heat exchanger 40 and the second end of indoor heat exchanger 30 are provided with the first electric expansion valve 51; The second electric expansion valve 52 is provided with between 4th end of outdoor heat exchanger 40 and the 4th end of indoor heat exchanger 30.Electric expansion valve, when defrost, is adjusted to certain aperture, reducing pressure by regulating flow, thus the height pressure reduction of the system of guarantee, impel refrigerant circulation to flow.And the flow of controlled refrigeration matchmaker, prevents liquid refrigerants from flowing to compressor air suction end, cause liquid hammer or reduce suction temperature, delivery temperature, affects defrost efficiency.
See Fig. 1 to Fig. 6, between the 3rd interface of the first cross valve 21 and the entrance of the first invariable frequency compressor 11, be provided with the first vapour liquid separator 61; The second vapour liquid separator 62 is provided with between 3rd interface of the second cross valve 22 and the entrance of the second invariable frequency compressor 12.The first check valve 71 is provided with between 3rd interface of the first cross valve 21 and the first vapour liquid separator 61; 3rd interface and second vapour liquid separator 62 of the second cross valve 22 are provided with the second check valve 72.
See Fig. 1 to Fig. 6, be provided with in the first defrost branch road in the first magnetic valve 81, second defrost branch road and be provided with the second magnetic valve 82.The 3rd magnetic valve 83 is provided with between first electric expansion valve 51 and the first set of heat exchange tubes 31; The 4th magnetic valve 84 is provided with between second electric expansion valve 52 and the second set of heat exchange tubes 32.
See Fig. 1 to Fig. 6, indoor heat exchanger 30 air inlet, arranges temperature sensor 90, testing environment temperature, and air outlet place arranges temperature sensor 90, detects air temperature.
See Fig. 5, indoor heat exchanger 30 comprises the first set of heat exchange tubes 31 and the second set of heat exchange tubes 32, first closed circuit is connected with the first set of heat exchange tubes 31, and the second closed circuit is connected with the second set of heat exchange tubes 32.First set of heat exchange tubes 31 and the second set of heat exchange tubes 32 are arranged alternately.Indoor heat exchanger 30, the heat exchanger tube row in direction is 1-4 row windward.Two refrigerant circulation circuit use a heat exchanger jointly, and it is divided into multiple set of heat exchange tubes, and the pipe number of each set of heat exchange tubes is identical.Refrigerant circulation first closed circuit uses the first set of heat exchange tubes 31, and refrigerant circulation second closed circuit uses the second set of heat exchange tubes 32; Between two the first set of heat exchange tubes 31, there is second set of heat exchange tubes 32.The quantity of the first set of heat exchange tubes 31, second set of heat exchange tubes 32 is identical, and concrete numerical value is determined by air conditioner refrigerating amount.Indoor heat exchanger 30, heat exchanger tube row in direction is reasonable windward, can reduce resistance, promotes air quantity, fully effectively utilizes all heat exchanger tubes and air to carry out heat exchange.Set of heat exchange tubes is spaced apart, and leaving air temp can be made relatively even.
See Fig. 6, outdoor heat exchanger 40 comprises the 3rd set of heat exchange tubes 41 and the 4th set of heat exchange tubes 42, first closed circuit is connected with the 3rd set of heat exchange tubes 41, and the second closed circuit is connected with the 4th set of heat exchange tubes 42.3rd set of heat exchange tubes 41 and the 4th set of heat exchange tubes 42 are disposed adjacent.Outdoor heat exchanger, the heat exchanger tube row in direction is 1 to 4 row windward.Two refrigerant circulation circuit use a heat exchanger fin jointly.Two refrigerant circulation circuit heat exchange tube groups are in distributing up and down, and lower placement also presented by two blower fans.Temperature sensor 90 is placed with, for detecting refrigerant temperature in suitable heat exchanger tube position; Temperature sensor 90 is arranged, for testing environment temperature at air intake place.
According to the control method of of the present invention kind of air-conditioning system, control aforesaid air-conditioning system, detect the difference of indoor environment temperature and design temperature, when difference reaches preset range, one or two in controller selection unlatching first closed circuit and the second closed circuit.The total run time of controller energy accumulating compression machine therefrom selects optimum scheme.First design temperature is preferably 4 DEG C, and the second design temperature is preferably 12 DEG C.
Under refrigeration mode, judge indoor environment temperature and design temperature difference.When difference > first design temperature of indoor temperature and design temperature, the first invariable frequency compressor 11 and the second invariable frequency compressor 12 are opened simultaneously, and cooling system runs; When indoor temperature and design temperature difference > 0 DEG C and when being less than or equal to the first design temperature, judge the total run time of the first invariable frequency compressor 11 and the second invariable frequency compressor 12, close more compressor running time, another compressor continues to run.
Suppose the first closed circuit refrigerating operaton, second closed circuit does not run, the state of components and parts is, first invariable frequency compressor, the first closed circuit fan operation, the outer blower fan of second invariable frequency compressor, the second closed circuit stops, and the 3rd magnetic valve 83, the 4th magnetic valve 84 are opened, and the first magnetic valve 81, second magnetic valve 82 cuts out, second electric expansion valve 52 regulates aperture according to system exhaust temperature, and the first electric expansion valve 51 is a fixing aperture.
Suppose the second closed circuit refrigerating operaton, first closed circuit does not run, the state of components and parts is, second invariable frequency compressor, fan operation, the outer blower fan of first invariable frequency compressor, the first closed circuit stops, and the 3rd magnetic valve 83, the 4th magnetic valve 84 are opened, and the first magnetic valve 81, second magnetic valve 82 cuts out, first electric expansion valve 51 regulates aperture according to system exhaust temperature, and the second electric expansion valve 52 is a fixing aperture.
Suppose the first closed circuit, the second closed circuit all refrigerating operatons, the state of components and parts is, first invariable frequency compressor, the first closed circuit fan operation, 3rd magnetic valve, the 4th magnetic valve 84 are opened, first magnetic valve 81, second magnetic valve 82 cuts out, and the second electric expansion valve 52, first electromagnetic expanding valve 51 regulates aperture according to system exhaust temperature.
Under heating mode, outdoor environment temperature is detected by temperature sensor 90, when outdoor temperature is more than or equal to the second design temperature, and then judge indoor environment temperature and design temperature difference, when difference > first design temperature of indoor temperature and design temperature, the first invariable frequency compressor 11 and the second invariable frequency compressor 12 are opened simultaneously; When indoor temperature and design temperature difference > 0 DEG C and when being less than or equal to the second design temperature, judge the total run time of the first invariable frequency compressor 11 and the second invariable frequency compressor 12, close more compressor running time, another compressor continues to run.
Heating mode opened by air-conditioning, under heating mode, when outdoor environment temperature be more than or equal to the second design temperature and difference > first design temperature of indoor temperature and design temperature time, the first invariable frequency compressor (11) and the second invariable frequency compressor (12) are opened simultaneously; When outdoor environment temperature is less than the second design temperature, both open, the first invariable frequency compressor (11) and the second invariable frequency compressor (12) are opened simultaneously.
Suppose the first closed circuit heating operation, second closed circuit does not run, the state of components and parts is, first invariable frequency compressor fan operation, second invariable frequency compressor blower fan stops, and the 3rd magnetic valve 83, the 4th magnetic valve 84 are opened, and the first magnetic valve 81, second magnetic valve 82 cuts out, second electric expansion valve 52 regulates aperture according to system exhaust temperature, and the first electric expansion valve 51 is a fixing aperture.
Suppose the second closed circuit heating operation, first closed circuit does not run, the state of components and parts is, second invariable frequency compressor fan operation, first invariable frequency compressor blower fan stops, and the 3rd magnetic valve 83, the 4th magnetic valve 84 are opened, and the first magnetic valve 81, second magnetic valve 82 cuts out, first electric expansion valve 51 regulates aperture according to system exhaust temperature, and the second electric expansion valve 52 is a fixing aperture.
Suppose the first closed circuit, the second closed circuit all heating operations, the state of components and parts is, first invariable frequency compressor blower fan and the second fixed motor fan frequently all run, 3rd magnetic valve 83, the 4th magnetic valve 84 are opened, first magnetic valve 81, second magnetic valve 82 cuts out, and the second electric expansion valve 52, first electromagnetic expanding valve 51 regulates aperture according to system exhaust temperature.
See Fig. 7, carry out defrost operation in a heating mode, first judge the running status of the first invariable frequency compressor 11 and the second invariable frequency compressor 12; If the first invariable frequency compressor 11 and the second invariable frequency compressor 12 are all in operation, whether the closed circuit detecting the first invariable frequency compressor 11 and the second invariable frequency compressor 12 place reaches defrost condition, wherein any one closed circuit reaches defrost condition, then the closed circuit at its place carries out defrost operation, and another closed circuit carries out heating operation; After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation.
If the first invariable frequency compressor 11 and second one of them compressor of invariable frequency compressor 12 are in operation, whether the closed circuit detecting the compressor place run reaches defrost condition, carry out defrost operation after reaching defrost condition, another compressor place closed circuit carries out heating operation; After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation, and the closed circuit carrying out heating operation when defrost runs is closed.Defrost condition is that compressor operating time is greater than 30min and continuous decrease in the refrigerant temperature at one end time.
The defrosting control method of air-conditioning system is specific as follows:
When air-conditioning system heats, controller judges the running status of compressor.If only have a compressor operating, if be the first invariable frequency compressor 11, when the first closed circuit detects defrost condition, first cross valve 21 commutates, and the 3rd magnetic valve 83 cuts out, and the first magnetic valve 81 is opened, outer blower fan stops, and the first electric expansion valve 51 is adjusted to defrost aperture.Meanwhile, the second invariable frequency compressor is opened, and outer fan operation, the 4th magnetic valve 84 is opened.When first closed circuit detects and exits defrost condition, first cross valve 21 commutates, second invariable frequency compressor is closed, outer blower fan on second closed circuit is opened, exogenous wind office on first closed circuit closes, and the 3rd magnetic valve 83 is opened, and the first magnetic valve 81 cuts out, first electric expansion valve 51 regulates aperture according to delivery temperature, and inner blower rotating speed returns to former rotating speed.
When air-conditioning system heats, controller judges the running status of compressor.If there are two compressor operatings, if the first closed circuit first detects enter defrost condition, the first cross valve 21 commutates, and the 3rd magnetic valve 83 cuts out, and the first magnetic valve 81 is opened, and the first outer blower fan stops, and the first electric expansion valve 51 is adjusted to defrost aperture.Second closed circuit continues heating operation.In defrost process, if when the leaving air temp detected by temperature sensor 90 is lower than 31 DEG C.Inner blower rotating speed reduces.Detect that when exiting defrost condition, the first cross valve 21 commutates, and the 3rd magnetic valve 83 is opened, and the first magnetic valve 81 cuts out, the first outer fan operation, the first electric expansion valve 51 regulates aperture according to delivery temperature, and inner blower rotating speed returns to former rotating speed.First closed circuit, the second closed circuit heating operation, now, completes a defrost, and two systems continue to detect defrost condition.If two systems detect defrost condition simultaneously, the first cross valve 21 commutates, and the 3rd magnetic valve 83 cuts out, and the first magnetic valve 81 is opened, and the first outer blower fan stops, and the first electric expansion valve 51 is adjusted to defrost aperture.Second closed circuit continues heating operation.In defrost process, if when the leaving air temp detected by temperature sensor 90 is lower than 31 DEG C.Inner blower rotating speed declines.Detect that when exiting defrost condition, the first cross valve 21 commutates, and the 3rd magnetic valve 83 is opened, first magnetic valve 81 cuts out, the first outer fan operation, and the first electric expansion valve 51 regulates aperture according to delivery temperature, inner blower rotating speed returns to former rotating speed, the first closed circuit heating operation, simultaneously, second cross valve 22 commutates, 4th magnetic valve 84 cuts out, and 82 second magnetic valves 82 are opened, and the second outer blower fan stops, second electric expansion valve 52 is adjusted to defrost aperture, and the second closed circuit defrost runs.In defrost process, if when the leaving air temp detected by temperature sensor 90 is lower than 31 DEG C.Inner blower rotating speed declines.Detect that when exiting defrost condition, the second cross valve 22 commutates, and the 4th magnetic valve 84 is opened, second magnetic valve 82 cuts out, the second outer fan operation, and the second electric expansion valve 52 regulates aperture according to delivery temperature, inner blower rotating speed returns to former rotating speed, the second closed circuit heating operation.Now, complete a defrost, two systems continue to detect defrost condition.
When the normal cooling and warming of air-conditioning system runs, compressor, fan operation, electric expansion valve regulates aperture according to delivery temperature, and the first magnetic valve 81, second magnetic valve 82 cuts out, and the 3rd magnetic valve 83, the 4th magnetic valve 84 are opened.When air-conditioning system enters defrost, compressor, the inner blower of defrosting system run, and outer blower fan stops, and electric expansion valve is adjusted to defrost aperture, the 3rd magnetic valve 83(or the 4th magnetic valve 84) close, the first magnetic valve 81(or the second magnetic valve 82) open.
During the first closed circuit air-conditioning system defrost, a kind of circulation is: from the first invariable frequency compressor 11 out, flow to the 3rd set of heat exchange tubes 41 in outdoor heat exchanger 40 through the first cross valve 21, frost removes refrigerant by high-temperature gas refrigerant.Refrigerant is through the first electric expansion valve 51 throttling afterwards, enters the first vapour liquid separator 61 by the first magnetic valve 81, and after liquid state refrigerant is separated, gaseous coolant is inhaled into compressor, completes a circulation.
During the second closed circuit air-conditioning system defrost, from the second invariable frequency compressor 12 out, flow to the 3rd set of heat exchange tubes 41 in outdoor heat exchanger 40 through the second cross valve 22, frost removes refrigerant by high-temperature gas refrigerant.Refrigerant is through the second electric expansion valve 52 throttling afterwards, enters the second vapour liquid separator 62 by the second magnetic valve 82, and after liquid state refrigerant is separated, gaseous coolant is inhaled into compressor, completes a circulation.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
By using two closed circuits, share indoor heat exchanger and outdoor heat exchanger, design temperature and environment temperature less time, use a compressor operating, reduce the output of cold, reduce the power consumption of air-conditioning; And air-conditioning is when defrosting, and still can continue to heat, to the hot blast of room supply uniform temperature, ensure the comfortableness in room.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (13)

1. an air-conditioning system, is characterized in that, comprises
First closed circuit and the second closed circuit,
Described first closed circuit comprises the first invariable frequency compressor (11), indoor heat exchanger (30), the first electric expansion valve (51) and outdoor heat exchanger (40);
Described second closed circuit comprises the second invariable frequency compressor (12), indoor heat exchanger (30), the second electric expansion valve (52) and outdoor heat exchanger (40);
The pipeline of described indoor heat exchanger (30) comprises parallel the first set of heat exchange tubes (31) and the second set of heat exchange tubes (32);
The pipeline of described outdoor heat exchanger (40) comprises the 3rd parallel set of heat exchange tubes (41) and the 4th set of heat exchange tubes (42);
Described first closed circuit is connected with described 3rd set of heat exchange tubes (41) with described first set of heat exchange tubes (31);
Described second closed circuit is connected with described 4th set of heat exchange tubes (42) with described second set of heat exchange tubes (32);
Controller, detects the difference of indoor environment temperature and design temperature, controls the opening and closing of described first closed circuit and described second closed circuit.
2. air-conditioning system according to claim 1, is characterized in that, described first closed circuit comprises the first cross valve (21), and described second closed circuit comprises the second cross valve (22):
The first interface of described first cross valve (21) is connected with the outlet of described first invariable frequency compressor (11); Second interface of described first cross valve (21) is connected with the first end of described outdoor heat exchanger (40);
3rd interface of described first cross valve (21) is connected with the entrance of described first invariable frequency compressor (11);
4th interface of described first cross valve (21) is connected with the first end of described indoor heat exchanger (30);
Second end of described outdoor heat exchanger (40) is connected with the second end of described indoor heat exchanger (30);
Described first closed circuit also comprises the first defrost branch road, the first end of described first defrost branch road is connected with the entrance of described first invariable frequency compressor (11), and the second end of described first defrost branch road is connected with the second end of described outdoor heat exchanger (40);
The first interface of described second cross valve (22) is connected with the outlet of described second invariable frequency compressor (12);
Second interface of described second cross valve (22) is connected with the 3rd end of described outdoor heat exchanger (40);
3rd interface of described second cross valve (22) is connected with the entrance of described second invariable frequency compressor (12);
4th interface of described second cross valve (22) is connected with the 3rd end of described indoor heat exchanger (30);
4th end of described outdoor heat exchanger (40) is connected with the 4th end of described indoor heat exchanger (30);
Described second closed circuit also comprises the second defrost branch road, the first end of described first defrost branch road is connected with the entrance of described second invariable frequency compressor (12), and the second end of described second defrost branch road is connected with the 4th end of described outdoor heat exchanger (40);
The inlet side of described indoor heat exchanger (30) and air side place are provided with temperature sensor (90);
The inlet side of described outdoor heat exchanger (40) and the 3rd set of heat exchange tubes (41) and the 4th set of heat exchange tubes (42) place are provided with temperature sensor (90).
3. air-conditioning system according to claim 2, is characterized in that, is provided with the first vapour liquid separator (61) between the 3rd interface of described first cross valve (21) and the entrance of described first invariable frequency compressor (11); The second vapour liquid separator (62) is provided with between 3rd interface of described second cross valve (22) and the entrance of described second invariable frequency compressor (12).
4. air-conditioning system according to claim 3, is characterized in that, is provided with the first check valve (71) between the 3rd interface of described first cross valve (21) and described first vapour liquid separator (61); 3rd interface and described second vapour liquid separator (62) of described second cross valve (22) are provided with the second check valve (72).
5. air-conditioning system according to claim 2, is characterized in that, is provided with the first magnetic valve (81) in described first defrost branch road, is provided with the second magnetic valve (82) in described second defrost branch road.
6. air-conditioning system according to claim 5, is characterized in that, is provided with the 3rd magnetic valve (83) between described first electric expansion valve (51) and described first set of heat exchange tubes (31); The 4th magnetic valve (84) is provided with between described second electric expansion valve (52) and the second set of heat exchange tubes (32).
7. air-conditioning system according to claim 1, is characterized in that, described first set of heat exchange tubes (31) and described second set of heat exchange tubes (32) are arranged alternately.
8. air-conditioning system according to claim 1, is characterized in that, the first half of described 3rd set of heat exchange tubes (41) heat exchanger disposed in the outdoor (40), the latter half of described 4th set of heat exchange tubes (42) heat exchanger disposed in the outdoor (40).
9. a control method for air-conditioning system, controls the air-conditioning system described in claim 1, it is characterized in that,
Detect the difference of indoor environment temperature and design temperature, when difference reaches preset range, one or two in controller selection unlatching first closed circuit and the second closed circuit.
10. the control method of air-conditioning system according to claim 9, is characterized in that,
Under refrigeration mode, when difference > first design temperature of indoor temperature and design temperature, the first invariable frequency compressor (11) and the second invariable frequency compressor (12) are opened simultaneously;
When indoor temperature and design temperature difference > 0 DEG C and when being less than or equal to the first design temperature, judge the total run time of described first invariable frequency compressor (11) and described second invariable frequency compressor (12), open less compressor running time.
The control method of 11. air-conditioning systems according to claim 9, is characterized in that,
Under heating mode, when outdoor environment temperature be more than or equal to the second design temperature and difference > first design temperature of indoor temperature and design temperature time, the first invariable frequency compressor (11) and the second invariable frequency compressor (12) are opened simultaneously;
When outdoor environment temperature is less than the second design temperature, both open, the first invariable frequency compressor (11) and the second invariable frequency compressor (12) are opened simultaneously.
The control method of 12. air-conditioning systems according to claim 9, is characterized in that,
Carry out defrost operation in a heating mode, first judge the running status of the first invariable frequency compressor (11) and the second invariable frequency compressor (12);
If described first invariable frequency compressor (11) and described second invariable frequency compressor (12) are all in operation, whether the closed circuit detecting described first invariable frequency compressor (11) and described second invariable frequency compressor (12) place reaches defrost condition, wherein any one closed circuit reaches defrost condition, then make this closed circuit reaching defrost condition carry out defrost operation, another closed circuit carries out heating operation;
After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation.
13., according to the control method of air-conditioning system described in claim 12, is characterized in that,
If described first invariable frequency compressor (11) and described second invariable frequency compressor (12) one of them compressor are in operation, whether the closed circuit detecting the compressor place run reaches defrost condition, carry out defrost operation after reaching defrost condition, another compressor place closed circuit carries out heating operation;
After defrost end of run, the closed circuit carrying out defrost operation carries out heating operation, and the closed circuit carrying out heating operation when defrost runs is closed.
CN201310724213.4A 2013-12-24 2013-12-24 Air-conditioning system and its control method Active CN104729029B (en)

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CN106524549A (en) * 2016-12-01 2017-03-22 广州华凌制冷设备有限公司 Constant-frequency air conditioning system and control method thereof
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CN105115211A (en) * 2015-09-23 2015-12-02 广东美的暖通设备有限公司 Air cooled heat pump cold and hot water unit and defrosting control method thereof
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CN105157293A (en) * 2015-09-23 2015-12-16 广东美的暖通设备有限公司 Water cooling and heating machine of air cooled heat pump and defrosting control method for water cooling and heating machine
CN105241141A (en) * 2015-09-23 2016-01-13 广东美的暖通设备有限公司 Air cooled heat pump water chiller-heater unit and defrosting control method thereof
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CN105115209A (en) * 2015-09-23 2015-12-02 广东美的暖通设备有限公司 Air cooled heat pump cold and hot water unit and defrosting control method thereof
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