CN1130532C - Composite air conditioner low temperature control method - Google Patents
Composite air conditioner low temperature control method Download PDFInfo
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- CN1130532C CN1130532C CN00100877A CN00100877A CN1130532C CN 1130532 C CN1130532 C CN 1130532C CN 00100877 A CN00100877 A CN 00100877A CN 00100877 A CN00100877 A CN 00100877A CN 1130532 C CN1130532 C CN 1130532C
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims abstract description 38
- 238000007710 freezing Methods 0.000 claims abstract description 16
- 230000008014 freezing Effects 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 9
- 238000009833 condensation Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 230000008016 vaporization Effects 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/026—Compressor control by controlling unloaders
- F25B2600/0261—Compressor control by controlling unloaders external to the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A composite air conditioner low temperature control method having a outdoor unit connecting with one or more indoor units comprises the first step of adjusting the volume of refrigerant flowing to indoor units in operation by turning on a motorized expansion valve of indoor unit to have a predetermined degree of opening, and performing a normal operation; and the second step of preventing each of indoor heat exchangers from freezing by sequentially controlling a bypass valve, the motorized expansion valve, an outdoor fan and a compressor in accordance with the temperature change of the indoor heat exchanger of the indoor unit during the normal operation. Accordingly, the method can maintain optimum cooling cycle regardless of the number of indoor units or refrigerating capacity.
Description
Technical field
The present invention relates to that an a kind of off-premises station is connected with one or more indoor set, the cold air-conditioning of compound list of the non-frequency type that can be simultaneously a plurality of rooms be freezed; Relate in particular to a kind of low temperature control method of composite air conditioner, how many this methods no matter quantity and the refrigerating capacity of operating indoor set is, only according to mean temperature by-pass valve control, outdoor blowers and the compressor of operating indoor heat converter, thereby prevent that heat exchanger from freezing.
Background technology
As shown in Figure 1, usually, a composite air conditioner (for example three indoor sets) is arranged at the indoor set 10,11,12 in each room respectively and is arranged at outdoor off-premises station 20 by one group to be formed.
Off-premises station 20 comprises magnetic valve 60,61,62, chamber A, the B of compressor 30, outdoor heat converter 40, outdoor blowers 41, by-passing valve 50, first capillary 51, chamber A, B, C, capillary 70,71,72, main solenoid valve 80 and the main capillary 81 of C.When by-passing valve 50 is used for a certain room refrigeration, the refrigerant bypass of the scheduled volume that will from outdoor heat converter 40, discharge, thus regulate the refrigerant flow of operating indoor set; The magnetic valve 60,61,62 of chamber A, B, C is used for each indoor set and opens or closes refrigerant flow, so that select its beginning state to freeze according to the running status (ON/OFF) of each indoor set 10,11,12.The capillary 70,71,72 of chamber A, B, C links to each other with each indoor set 10,11,12, so that will be by the room temperature of gained and the refrigerant that the liquid cryogen under the high pressure changes into the easy vaporization of low pressure, low temperature after outdoor heat converter 40 coolings and the condensation.Main solenoid valve 80 is used for when the operation of air conditioner in a certain room, and refrigerant is emitted and import the capillary 70,71,72 of chamber A, B, C from outdoor heat converter 40, thereby regulates the refrigerant flow of operating indoor set.Main capillary 81 is used for when the operation of the indoor set of second, third chamber, reduces the pressure for vaporization of the liquid cryogen of room temperature and high pressure after outdoor heat converter 40 coolings and condensation. Indoor set 10,11,12 is furnished with indoor heat converter 90,91,92 and indoor blower 100,101,102 respectively.
The air-conditioning that constitutes by said structure, when outdoor heat converter 40 is discharged and imported to the steam state refrigerant of high temperature, high pressure from the compressor 30 of off-premises station 20, outdoor heat converter 40 carries out heat exchange with the steam state refrigerant of this high temperature, high pressure, and utilize outdoor blowers 40 air blast, thereby carry out strong cooling and condensation.
Referring to Fig. 2, as a certain room refrigeration, then by-passing valve 50 and main solenoid valve 80 opened and allowed a certain amount of refrigerant discharge from heat exchanger 40, through by-passing valve 50 bypasses, by the liquid cryogen of room temperature that obtains after outdoor heat converter 40 condensations and the high pressure main solenoid valve 80 of flowing through again.
Referring to Fig. 2, the liquid cryogen that flows through the room temperature of main solenoid valve 80 and high pressure flows into the capillary 70,71 or 72 of corresponding chamber A, B or C through one of the magnetic valve 60,61 of chamber A, B or C or 62, obtain the refrigerant of the easy vaporization of low pressure and low temperature, be imported into the indoor heat converter 90,91 or 92 of corresponding chamber A, B or C then.
Therefore, when the low temperature after the capillary 70,71,72 of chamber A, B or C is regulated, low pressure easily the refrigerant of vaporization be vaporized when changing into gas, 90,91,92 places carry out heat exchange at indoor heat converter, and utilize indoor blower 100,101,102 air blast that room air is lowered the temperature.Thereby this air of being lowered the temperature is discharged the into indoor process of refrigerastion of finishing.Low temperature, low-pressure refrigerant after indoor heat converter 90,91,92 places of chamber A, B, C carry out heat exchange flow into compressor 30 once more, thereby carry out circularly cooling.
In addition, referring to Fig. 2, when other two chambers 2, when freeze simultaneously in chamber 3, then by-passing valve 50 and main solenoid valve 80 are closed, allow through outdoor heat converter 40 condensed room temperature high-pressure liquid cryogen flow through main capillary 81, and flow into the capillary 70,71,72 of chamber A, B, C, thereby finish the refrigeration of two rooms (chamber A+B, chamber B+C, chamber A+C) or three rooms (chamber A+B+C) through the magnetic valve 60,61,62 of two or three chambers.
As mentioned above, when refrigeration has been carried out behind the certain hour, because the discharging of cold air, and in 90,91,92 pairs of refrigerant vaporizations of indoor heat converter institute calorific requirement, the temperature of indoor heat converter 90,91,92 reduces when carrying out heat exchange by indoor blower 100,101,102 air blast.When the temperature of indoor heat converter drops to below 0 degree centigrade, indoor heat converter 90,91,92 freezes, and has reduced the blow rate required of indoor blower 100,101,102.Therefore more quickened freezing speed.
In order to address the above problem, below introduce a kind of low temperature control method.The method is controlled compressor 30, outdoor blowers 41 and indoor blower 100,101,102 by the variations in temperature that detects indoor heat converter 90,91,92 in process of refrigerastion, thereby prevents that indoor heat converter 90,91,92 from freezing.
Referring to Fig. 3, when a certain indoor heat converter to a certain room freeze (one of chamber A, B, C), its temperature is lower than-1 degree centigrade when keeping 6 minutes, at first the first step (high to low, be low to moderate the conversion of closing) reduce outdoor blowers 41 rotating speed (rev/min), to prevent to freeze control program.Prevent to freeze in the first step of control program in execution, if the temperature of indoor heat exchanger does not rise to 5 degrees centigrade in 3 minutes, then prevent to freeze second step of control program, be close compressor 30 and outdoor blowers 41, and reduce the rotating speed (be set to the slow-speed of revolution (rev/min) of the corresponding indoor blower in this room (one of chamber A, B, C)).
Referring to Fig. 3, when a plurality of rooms (2 or 3 rooms) when freezing, if the in-room switch of chamber A, B or C is lower than-1 degree centigrade when continuing 6 minutes, then prevent to freeze control program first step (high to low, be low to moderate the conversion of closing), promptly reduce outdoor blowers 41 rotating speed (rev/min).Prevent to freeze in the first step of control program in execution, if the temperature of indoor heat exchanger is not above 5 degrees centigrade in 3 minutes, then prevent to freeze second step of control program, be close compressor 30, outdoor blowers 41, and reduce the rotating speed (be set to the slow-speed of revolution (rev/min) of the indoor blower of two rooms (chamber A+B, chamber B+C, chamber A+C) or three rooms (chamber A+B+C)).
On the other hand, freeze in second step of control program preventing, when if the temperature of indoor heat converter rises to 5 degrees centigrade, the compressor 30 of operating indoor set, outdoor blowers 41 and indoor blower return and prevent to freeze the preceding normal operating condition of control program.In addition, if the temperature of indoor heat exchanger surpasses 0 degree centigrade in 6 minutes, the indoor set counting that stops 6 minutes and move then with normal operating condition.
Yet there is following problem in the low temperature control method of above-mentioned traditional composite air conditioner.The first: under the situation of room refrigeration, no matter the load of operating indoor set is much, and its by-passing valve is opened all the time, thus the refrigerating capacity when having reduced its normal operating conditions.
It two is: when the room freezed between many, the load of each indoor set is all inequality, and was then lower in the temperature of other underload room heat exchange of the temperature of the indoor heat converter with high load capacity higher (because of the higher refrigerating capacity of needs), therefore caused freezing.And, if arbitrary heat exchanger in underload room freezes, prevent to freeze control program (can control at first), then change of the speed of outdoor blowers 41 or compressor are closed, thereby cause improper circulation, make arbitrary indoor set all can not freeze normally.
Summary of the invention
Purpose of the present invention is for addressing the aforementioned drawbacks, one of its purpose is: the low temperature control method that a composite air conditioner is provided, how many this methods no matter quantity and the refrigerating capacity of operating indoor set is, only control by-passing valve, electric control expansion valve, outdoor blowers and compressor according to the order of sequence according to the mean temperature of operating indoor heat converter, preventing that heat exchanger from freezing, thereby reach best kind of refrigeration cycle.
The present invention is devoted to address the aforementioned drawbacks, another purpose is: a composite air conditioner low temperature control method is provided, when the room that a plurality of loads have nothing in common with each other freezes simultaneously, the opening degree of the electric control expansion valve by control respective chambers machine, prevent that the respective chambers machine from freezing, guarantee that simultaneously the indoor set in other room normally moves.
The Fang Shixian above-mentioned purpose, the composite air conditioner low temperature control method that an off-premises station provided by the invention connects one or more indoor set, can freeze to room between many, may further comprise the steps: carry out a room refrigerating operation, its electric control expansion valve with ongoing indoor set open to a predetermined opening degree adapting to the quantity of operating indoor set, thereby by operation indoor set control refrigerant flow; And execution low temperature control program, in the operating process of when it prevents every indoor heat converter low temperature, freezing, variations in temperature according to operating indoor heat converter, control by-passing valve according to the order of sequence, electric control expansion valve, outdoor blowers and compressor, wherein said low temperature control program comprises step: the first step of low temperature control program: when the time that an indoor heat converter remains below first design temperature surpasses a given time value, open second by-passing valve; Second step of low temperature control program: after executing first step, when the time that this indoor heat converter remains below second design temperature surpasses a given time value, open first by-passing valve; The third step of low temperature control program: after executing second step, when indoor heat converter keeps below the 3rd design temperature, the rotating speed of change outdoor blowers (rev/min); And the 4th step of low temperature control program: after executing third step, when the time that indoor heat converter remains below the 4th design temperature surpasses a given time value, close compressor.
Description of drawings
Fig. 1 is the refrigerant cycle flow chart of traditional composite air conditioner that has three indoor sets;
Fig. 2 is in traditional composite air conditioner that has three indoor sets, and according to the quantity of indoor set in service, magnetic valve is opened state diagram;
Fig. 3 hangs down the figure of temperature control for traditional temperature according to its heat exchanger;
Fig. 4 is the refrigerant cycle flow chart that has the composite air conditioner of three indoor sets of the present invention;
Fig. 5 is the circuit block diagram of composite air conditioner low temperature control device of the present invention;
Fig. 6 hangs down each controlled part of temperature control for the present invention according to the temperature of its heat exchanger state diagram;
Fig. 7 hangs down the step chart of temperature control for expression the present invention according to the speed of its outdoor blowers;
Fig. 8 for the present invention when room refrigeration, the load condition figure when low temperature control step is returned normal operation;
Fig. 9 for the present invention when two rooms refrigeration, the load condition figure when low temperature control step is returned normal operation;
Figure 10 a, 10b are the embodiment of the invention one when a room refrigeration, the flow chart of low temperature control method;
Figure 11 a, 11b are the embodiment of the invention two when two rooms refrigeration, the flow chart of low temperature control method.
The specific embodiment
The present invention is described in detail to contrast accompanying drawing below in conjunction with embodiment.
Fig. 4 is the refrigerant cycle flow chart that has the composite air conditioner of three indoor sets of the present invention, and wherein identical with conventional composite type air-conditioning parts have adopted identical with it label.
Referring to Fig. 4, this composite air conditioner has three indoor sets 10,11,12 and off-premises stations 20, be provided with compressor 30 in the off-premises station 20, outdoor heat converter 40, outdoor blowers 41, first by-passing valve 110 and first capillary 111 that are used for a certain amount of refrigerant of discharging by compressor 30 of bypass, second by-passing valve 120 and second capillary 121 that are used for a certain amount of refrigerant of discharging by outdoor heat converter 40 of bypass, chamber A, B, the electric control expansion valve 130 of C, 131,132, these expansion valves are used for the running status (ON/OFF) according to each indoor set, open or close selectively to finish each room refrigeration.
In addition, indoor set 10,11,12 comprises indoor heat converter 90,91,92 respectively, indoor blower 100,101,102 and the temperature sensor 140,141,142 that is used to detect and export indoor heat converter 90,91,92 temperature.
The low temperature control method of composite air conditioner of the present invention can be referring to Fig. 5.
As shown in Figure 5: supply unit 150 will change the DC voltage of certain value into by the alternating voltage of ac power input end (not mark) input, export control device 154 again to.The function key that operating control device 152 is set (TS) temperature, running state of air conditioner (ON/OFF) etc. by one group of input method of operation (modes such as refrigeration, defrosting, air blast automatically), adjustment air quantity, adjustment is formed.
For realizing no matter how many quantity and refrigerating capacitys of operating indoor set be, can both control the indoor set operation respectively according to the mean temperature of operating indoor heat converter 90,91,92, to finish the best kind of refrigeration cycle of each indoor set, control device 154 is carried out first step to the four steps successively.That is: open or close first and second by-passing valves 110,120; The electric control expansion valve 130,131,132 that changes chamber A, B, C is to the best opening degree of gained after tested; Change the rotating speed of outdoor blowers 41; Open or close compressor 30.
The outdoor blowers drive unit controls the unlatching of outdoor blowers 61 according to the design temperature (TS) and the comparative result of room temperature (Tr) or cuts out.Indoor blower drive unit 162 is according to the rotating speed of blower motor in the blow rate required control rooms that set and open or close indoor blower 100,101,102, so that will be blown into indoor by 90,91,92 air that carried out heat exchange of indoor heat converter.
And, for the quantity according to operating indoor set 10,11,12 opens or closes the flow of valve with control refrigerant, the control signal that refrigerant valve actuator 164 receives by control device 154 outputs, open or close first, second by-passing valve 110,120 or open or close electric control expansion valve 130,131,132, make it be positioned at the opening degree that sets.
Below introduce the operating process of composite air conditioner low temperature control method of the present invention in detail.
At first, the composite air conditioner low temperature control method during room of the present invention refrigeration can be referring to Figure 10 a and Figure 10 b.
When Figure 10 a and 10b are a room of embodiment of the invention refrigeration, the flow chart of low temperature control method.
When air-conditioning is connected power supply, supply unit 150 will change the DC voltage of certain value into by the alternating voltage of ac input end (not mark) input, and export each drive circuit and control device 154 to.
Simultaneously, the user selects signal and operation commencing signal (hereinafter to be referred as run signal) by quantity, design temperature (TS), setting air quantity, operation that the function key on the operating control device 152 is set the refrigeration room, and transports to control device 154 by operating control device 152.
Among the step S1, control device 154 judges whether that a room freezes.As determine that a room is freezing when being (be), execution in step S2 then, control device 154 outputs one control signal to indoor blower motor driver 162 and valve actuator 164, with indoor blower 100,101,102 and the electric control expansion valve 130,131,132 that drives operating indoor set (chamber A, B or C).
Therefore, indoor blower motor driver 162 is according to the indoor blower 100,101,102 of one of the motor speed of the air quantity control indoor blower that sets and priming chamber A, B, C.Valve actuator 164 is opened the electric control expansion valve 130,131,132 of one of chamber A, B, C to certain opening degree (250 grades: through the best opening degree of measuring), to adapt to the needs of a room refrigeration.
Follow execution in step S3, whether the room temperature (Tr) that control device 154 judgements are measured by room temperature detector 156 is higher than sets temperature (TS).
According to the result of determination of step S3, if room temperature Tr is higher than and sets temperature T S (being when being), then carry out next step S4, control device 154 outputs one control signal to compressor drive apparatus 158, to start compressor 30.Simultaneously, output one controls signal to outdoor blowers Vidacare corp 160, to drive outdoor blowers 41, and according to outdoor temperature (when outdoor temperature above 28 degrees centigrade, its rotating speed is set to high rotating speed, and when outdoor temperature low 26 degrees centigrade, its rotating speed is set to the slow-speed of revolution) control its rotating speed.
Therefore, compressor drive apparatus 158 starts compressor 30 by the control signal by control device 154 outputs.Outdoor blowers motor driver 160 by by the control signal of control device 154 output with outdoor blowers 41 be set at high or low rotating speed (rev/min).
When compressor 30 and outdoor blowers 41 opened, the steam state refrigerant of high temperature, high pressure emitted from off-premises station 20 compressors, and in step S5 flood chamber outer heat-exchanger 40.Outdoor heat converter 40 utilizes the outdoor blowers air blast to carry out heat exchange to the steam state refrigeration of this HTHP and it is carried out condensation, thereby has strengthened the effect of cooling and condensation.
Room temperature, high pressure, liquid cryogen behind outdoor heat converter 40 place's condensation liquefactions is imported in the electric control expansion valve 130,131,132 of the chamber A, the B that open with certain opening degree, C, its open degree is 250 grades (other electric control expansion valve keeps closed condition), to reduce pressure, obtain the evaporable refrigerant of low-temp low-pressure, flow in chamber A, the B be installed in the indoor set 10,11,12, the C indoor heat converter 90,91,92 then.
When the refrigerant of easily vaporizing, after the vaporization of indoor heat converter 90,91,92 places of corresponding chamber A, B, C, be transformed into gas through the low temperature after the step-down of one of electric control expansion valve 130,131,132, low pressure.Simultaneously carry out heat exchange, and utilize indoor blower 100,101,102 air blast, thereby make the room air cooling with room air.Then this air of being lowered the temperature (cold air) be disposed to indoor, thereby finish the refrigeration program in a room.Steam state refrigerant in indoor heat converter 90,91,92 cooling of chamber A, B, C is imported in the compressor 30 once more, can recycle.
As mentioned above, when freezing, room temperature detector 156 temperature T P to the indoor heat converter of operating indoor set in step S6 detects.Simultaneously, control device 154 judges whether the temperature T P of the indoor heat converter of this operating indoor set is lower than 4 degrees centigrade.
According to the result of determination of step S6, if the output temperature TP of the indoor heat converter of operating indoor set is not less than 4 degrees centigrade (when being not), then returns and carry out the rapid S5 of previous step, continue the refrigerating operaton in a room.
On the other hand, if the output temperature TP of the indoor heat converter of operating indoor set is lower than 4 degrees centigrade (being when being), then carry out next step S7, as shown in Figure 6, the heat exchanger judged of control device 154 is kept the time that is lower than 4 degrees centigrade and whether is surpassed a given time value (t1) (for example t1 is 5 seconds).
According to the result of determination of step S7, if surpassed given time value t1, then follow execution in step S8, control device 154 outputs one control signal to valve actuator 164, to open second by-passing valve 120.
Referring to Fig. 6,7, valve actuator 164 is opened second by-passing valve 120 according to the control signal of control device 154, and the refrigerant that outdoor heat converter 40 is discharged is pressed both quantitatively bypasses, thereby finishes the first step of low temperature control program.
Behind the first step of finishing the low temperature control program, as shown in Figure 6, execution in step S9, control device 154 judge whether the temperature T P of indoor heat converter is lower than 2 degrees centigrade.If be not less than 2 degrees centigrade of (when being not), then repeated execution of steps S9.
According to the result of determination of step S9, if the temperature T P of indoor heat converter is lower than 2 degrees centigrade (being when being), then execution in step S10 then, control device 154 judge indoor heat converter keep be lower than 2 degrees centigrade time whether above a given time value t1.
According to the result of determination of step S10, if surpassed a given time value (being when being), then carry out next step S11, control device 154 outputs one control signal to valve actuator 164, to drive first by-passing valve 120.
Therefore, when valve actuator 164 is opened first by-passing valve 110 according to the output control signal of control device 154, the refrigerant that compressor 30 is given off is by both quantitatively bypasses, thereby finishes second step of low temperature control program.
Shown in Fig. 6 and Figure 10 a, finish first, second step of low temperature control program after, then execution in step S12, control device 154 judges whether the temperature T P of the indoor heat converter of one of chamber A, B, C is higher than 10 degrees centigrade.
Result of determination according to step S12, if the temperature T P of indoor heat converter is higher than 10 degrees centigrade (being when being), then carry out next step S13, the state that sets in first and second step that control device 154 is confirmed by the low temperature control program is eliminated, and valve actuator 164 is closed second by-passing valve 120.
Execution in step S14 judges whether the temperature T P of indoor heat converter is higher than 12 degrees centigrade then.
As shown in Figure 6, result of determination according to step S14, if the temperature T P of indoor heat converter is higher than 12 degrees centigrade (being when being), then carry out next step S15, control device 154 is confirmed to be eliminated by the state that low temperature control program second step sets, and valve actuator 164 is closed first by-passing valve.Then, return execution in step S6, and repeat continuous thereafter step.
As shown in Figure 6, according to the result of determination of step S14,, then carry out next step S16 if the temperature T P of indoor heat converter is higher than 12 degrees centigrade (when being not).After control device 154 judgements executed second step of low temperature control program, whether the temperature T P of operating indoor heat converter was lower than 0 degree centigrade.
According to the result of determination of step S16,, then carry out next step S17 if the temperature T P of heat exchanger is lower than 0 degree centigrade (being when being) in the operation unit room.Control device 154 outputs one control signal to outdoor blowers drive unit 160, to reduce the rotating speed of outdoor blowers 41.
Therefore, shown in Fig. 6,7, the control signal that outdoor blowers drive unit 160 sends according to control device 154 reduces the rotating speed (high to low, be low to moderate and close) of outdoor blowers 41, thereby has finished the third step of low temperature control program.
After the third step of low temperature control program is finished, as shown in Figure 6, execution in step S18 then.After changing the rotating speed of outdoor blowers 41, in step S18, control device 154 judges whether the temperature T P of operating indoor heat converter (room) rises to 4 degrees centigrade (when outdoor temperature is not higher than 26 degrees centigrade) or 8 degrees centigrade (when outdoor temperature is higher than 28 degrees centigrade).
Result of determination according to step S18, if the temperature T P of indoor heat converter is higher than 4 or 8 degrees centigrade (being when being), execution in step S19 then, as shown in Figure 6, control device 154 outputs control signals to outdoor blowers drive unit 160, makes outdoor blowers 41 return initial speed (low paramount, close to low).Then, return execution in step S16.
On the other hand, as shown in Figure 6,,, then carry out next step S20 if the temperature T P of indoor heat converter is not higher than 4 or 8 degrees centigrade (when being not) according to the result of determination of step S18.154 third steps of carrying out the low temperature control program of control device, and judge whether the temperature T P of indoor heat converter is lower than-3 degrees centigrade.If the temperature of indoor heat converter is not less than-3 degrees centigrade of (when being not), then repeating step S20.
As shown in Figure 6, according to the result of determination of step S20,, then carry out next step S21 if the temperature T P of indoor heat converter is lower than-3 degrees centigrade (being when being).Control device 154 judges whether the time of the temperature maintenance-3 degree centigrade of indoor heat converter surpasses given time value t1.
Shown in Fig. 6,7, result of determination according to step S21, if surpassed given time value t1 (being when being), execution in step S22 then, as shown in Figure 8, control device 154 close compressor 30 and outdoor blowers 41, and the rotating speed of the indoor blower of the indoor set in the conversion operation (being set at the low slow-speed of revolution (LL)).
When compressor 30 is in stopped status, finish time-delay in 3 minutes and 2 fens half pressure balance control programs simultaneously.One in the electric control expansion valve 130,131,132 of operating indoor set (room) moves to 180 grades, and keeps its dormant state.The electric control expansion valve of off-duty other indoor set keeps its closed condition.These operation sequences are all finished in the 4th step of low temperature control program.
Therefore, no matter how many quantity or refrigerating capacitys of operating indoor set be, is the temperature of the indoor heat converter that detects indoor set in service (room), and the low temperature control program is finished first to fourth step according to the order of sequence.So when this operating indoor set had high load capacity in himself running, by-passing valve cut out, thereby has guaranteed the maximum cooling capacity of indoor set in service.
Follow execution in step S23, whether control device 154 judges that compressor 30 remains on holding state and whether surpasses 3 minutes, promptly delayed time 3 minutes.If surpassed 3 minutes (being when being), execution in step S24 then, control device 154 judges whether the temperature T P of indoor heat converters is higher than 6 degrees centigrade.
According to the result of determination of step S24, if the temperature T P of indoor heat converter is higher than 6 degrees centigrade.(being when being) then carries out next step S25, and control device 154 is judged whether room temperature TR is higher than and set temperature T S.
According to the result of determination of step S25, if room temperature TR is higher than design temperature TS (being when being), control device 154 finishes the low temperature control program, and makes indoor set be in its normal operating condition.Then, carry out next step S26, control device 154 is set to opening with compressor 30, outdoor blowers is in carries out the preceding original state (being high or low rotating speed running status) of low temperature control program, first and second by-passing valve 110,120 is in closed condition, and operating indoor set (room) is with its rotary speed that sets operation.One in the pairing electric control expansion valve 130,131,132 of operating indoor set (room) moves to 250 grades, and finishes its normal running.Return execution in step S5 again, and repeat continuous thereafter step.
Referring to accompanying drawing 11a and 11b, below introduce in detail the present invention in a plurality of rooms (two or three room) low temperature control method when freezing.
Figure 11 a and 11b are the embodiment of the invention two when two rooms refrigeration, the flow chart of low temperature control method.
At first, execution in step S31, control device 154 judges whether to carry out the refrigerating operaton in two rooms.If carry out two room refrigeration (being when being), then carry out next step S32, the indoor set in two rooms and two valves in the electric control expansion valve 130,131,132 are to certain opening degree, to adapt to the refrigeration demand in two rooms among control device 154 A of opening chamber, B, the C.
Then execution in step S33, control device 154 judge whether that room temperature TR is higher than and set temperature T S, do not set temperature T S (when being not), repeating step S33 if room temperature TR is not higher than.If room temperature TR is higher than and sets temperature T S (being when being), then carry out next step S34.
In step S34, control device 154 starts compressor 30, and outdoor blowers is changed paramount rotating speed (when outdoor temperature is higher than 28 degrees centigrade) or gone to low speed (when outdoor temperature is not less than 26 degrees centigrade).
After compressor 30 and outdoor blowers startup, then execution in step S35 freezes to two rooms.The refrigerant of steam state HTHP emits from compressor 30 and flood chamber outer heat-exchanger 40, then, obtains the refrigerant of liquid room temperature high pressure after the condensation.
Flow into two electric control expansion valves that have certain opening degree accordingly among chamber A, B, the C at the liquid room temperature high-pressure refrigerant that external heater 40 places condensation in chamber obtains, and it is carried out step-down, then, the refrigerant of the low temperature of gained, low pressure is injected in the indoor heat converter 90,91,92 of chamber A, B, C two.
Therefore, the refrigerant of this low-temp low-pressure is vaporized in the indoor heat converter of corresponding chamber A, B, C.Simultaneously, extraneous air is cooled.This chilled air is discharged into indoor, thereby finishes the refrigeration (chamber A+B, chamber B+C, chamber A+C) in two rooms.Then, the refrigerant of this low-temp low-pressure is sent to compressor and recycles after corresponding indoor heat exchanger 90,91,92 places carries out heat exchange.
When carrying out the refrigeration work in two rooms, execution in step S36, temperature-detecting device 156 detects the output temperature TP of operating indoor heat converter, and control device 154 judges whether the mean temperature TPM of two operating indoor heat converters is lower than 4 degrees centigrade.
According to the result of determination of step 36,, return execution in step S35 if whether the mean temperature TPM of indoor heat exchanger is lower than 4 degrees centigrade (when being not); If the mean temperature TPM of indoor heat converter is lower than 4 degrees centigrade (being when being), then carry out next step S37.Control device 154 judges that the mean temperature of indoor heat converter keeps the time that is lower than 4 degrees centigrade and whether surpass the i.e. value of fixing time T1 (for example, T1 is 5 seconds).
Result of determination according to step S37, if surpass given time value T1 (when being not), repeating step S36 then (for example surpasses promptly the value of fixing time T1 if the mean temperature of indoor heat converter is kept the time that is lower than 4 degrees centigrade, T1 is 5 seconds) time, next step S38 then carried out.Control device 154 is opened second by-passing valve, with a certain amount of refrigerant bypass that is given off by outdoor heat converter 40.Thereby finish the first step of low temperature control program.
Then, execution in step S39, as shown in Figure 6, control device 154 judges whether the mean temperature TPM of indoor heat converter is lower than 2 degrees centigrade, if the mean temperature TPM of indoor heat converter is not less than 2 degrees centigrade of (when being not), then repeating step S39; If the mean temperature TPM of indoor heat converter is lower than 2 degrees centigrade (being when being), then carry out step S40 down.Control device 154 judges whether that the mean temperature TPM of indoor heat converter keeps the time that is lower than 2 degrees centigrade and surpasses given time value T1.
According to the result of determination of step S40, do not surpass given time value T1 (when being not), then repeating step S40 if keep the time that is lower than 2 degrees centigrade; If surpassed given time value T1 (being when being), then carried out next step S41.Control device 154 is opened first by-passing valve, with a certain amount of refrigerant bypass that is given off by compressor 30.Thereby finish second step of low temperature control program.
As shown in Figure 6, execute first and second step of low temperature control program after, execution in step S42.Control device 154 judges whether the mean temperature TPM of indoor heat converter is higher than 10 degrees centigrade.
According to the result of determination of step S42, as shown in Figure 6,, then carry out next step S43 if the mean temperature TPM of indoor heat converter is higher than 10 degrees centigrade (being when being).The state of the first step of control device 154 affirmation low temperature control programs is eliminated, and closes second by-passing valve 120.
Then, carry out next step S44.As shown in Figure 6, control device 154 is kept the second by-passing valve closed condition, and judges whether TPM is higher than 12 degrees centigrade.
According to step S44 result of determination, as shown in Figure 6,, then carry out next step S45 if TPM is higher than 12 degrees centigrade (being when being).The state of control device 154 affirmation low temperature control programs second step is eliminated, and closes first by-passing valve 120.Return execution in step S36 then, and repeat continuous thereafter step.
Result of determination according to step S44, if TPM is not higher than 12 degrees centigrade (are not time), execution in step S46 then, control device 154 judge whether finish the TPM that is lower than after the temperature control program is lower than 0 degree centigrade, if be not less than 0 degree centigrade of (when being not), then repeating step S46.
According to the result of determination of step S46,, then carry out next step S47 if TPM is lower than 0 degree (being when being).The rotating speed of control device 154 conversion outdoor blowers 41 (high to low, be low to moderate and close), thus the third step of low temperature control program finished.
After executing the third step of low temperature control program, after promptly outdoor blowers 41 is changed rotating speeds, execution in step S48.As shown in Figure 6, control device 154 judge TPM whether be higher than 4 degrees centigrade (when outdoor temperature is lower than 26 degrees centigrade) or 8 degrees centigrade (when outdoor temperature above 28 degrees centigrade).
According to the result of determination of step S48, if TPM is higher than 4 or 8 degrees centigrade (being when being), then carry out next step S49, control device 154 places the initial rotating speed (low paramount, close to low) of low temperature control program before the 3rd step with outdoor blowers 41.Return execution in step S46 again, and repeat continuous thereafter step.
On the other hand, result of determination according to step S48, if TPM is not higher than 4 or 8 degrees centigrade (when being not), then carry out next step S50, as shown in Figure 6, whether the temperature T PA (for example, the indoor heat converter of chamber A) that the indoor heat converter behind the low temperature control program third step is finished in control device 154 judgements is lower than-3 degrees centigrade.
According to step S50 result of determination, if the temperature T PA of the indoor heat converter of chamber A is lower than-3 degrees centigrade (being when being), then execution in step S51.Control device 154 judges that the temperature T PA of the indoor heat exchanger of chamber A keeps the time that is lower than-3 degrees centigrade and whether surpasses given time value T1.
According to the result of determination of step S51,, then carry out next step S52 if surpassed given time value T1 (being when being).Control device 154 moves to 180 grades with the electric control expansion valve of the indoor set of chamber A, and indoor blower 100 is converted to the low slow-speed of revolution (LL) from setting rotating speed.
Therefore, no matter how many quantity or its refrigerating capacitys of operating indoor set be, what detected is the mean temperature (TPM) in indoor heat converter (two rooms), thereby finishes low temperature control program first to third step.When the load of indoor set not simultaneously, the electric control expansion valve 130 of indoor set satisfies the low temperature control program condition in the 4th step, its opening degree controlled (180 grades), thereby prevented that indoor set from freezing.Simultaneously, form the optimum cycle of refrigeration.
The temperature T PB that execution in step S53 then, control device 154 judge the in-room switch of chamber B (for example: chamber B) whether be lower than-3 degrees centigrade in the temperature control program of finishing chamber A after the 4th step.
According to the result of determination of step S53,, then carry out next step S54 if the temperature T PB of the indoor heat converter of chamber B is lower than-3 degrees centigrade (being when being).As shown in Figure 6, control device 154 judges that the temperature T PB of the indoor heat converter of chamber B keeps the time that is lower than-3 degrees centigrade and whether surpasses given time value T1.
According to the result of determination of step S54,, then carry out next step S55 if surpassed given time value T1 (being when being).Control device 154 makes temperature T PA, the TPB of the indoor heat converter of chamber A, B satisfy the low temperature control program condition in the 4th step.Shown in Fig. 6,7, control device 154 close compressor 30 and outdoor blowers 41, simultaneously, (at this moment, the rotating speed of the indoor blower of chamber A has been the low slow-speed of revolution (LL) to transfer the rotating speed of the indoor blower 101 of chamber B to the low slow-speed of revolution (LL) from the rotating speed that sets
When compressor 30 is in off-mode, carry out time-delay in three minutes and two fens half pressure balance control programs.The electric control expansion valve 131 of chamber B moves to 180 grades, and keeps its dormant state (at this moment, the electric control expansion valve 130 of chamber A has been positioned at 180 grades).And being in the corresponding electric control expansion valve of stopped status, indoor set keeps its closed condition.At last, finish the 4th step of low temperature control program.
Follow execution in step S56, control device 154 judges whether compressor 30 delayed time 3 minutes.If compressor 30 has been delayed time three minutes (being when being), then carry out next step S57, control device 154 judges whether the temperature T PA of the in-room switch of chamber A is higher than 6 degrees centigrade.
According to the result of determination of step S57,, then carry out next step S58 if the temperature T PA of the indoor heat converter of chamber A is higher than 6 degrees centigrade (being when being).The low temperature control program of control device S154 cancellation chamber A, indoor set returns its normal refrigerating operaton state.Then, control device 154 starts compressor 30, and outdoor blowers is returned it and carried out the preceding original state (high or low rotating speed) of low temperature control program, and first, second by-passing valve cuts out, and the rotating speed of the indoor blower of chamber A is for setting rotating speed.The electric control expansion valve 130 of chamber A moves to 250 grades, and returns execution in step S35, repeats its subsequent step.
On the other hand, according to the result of determination of step S57,, then carry out next step S59 if the temperature T PA of chamber A heat exchanger is not higher than 6 degrees centigrade (when being not).Control device 154 judges whether the temperature T PB of the indoor heat converter of chamber B is higher than 6 degrees centigrade.If the temperature T PB of the indoor heat converter of chamber B is not higher than 6 degrees centigrade (when being not), then returns execution in step S57, and repeat its subsequent step.
According to the result of determination of step S59,, then carry out next step S60 if the temperature T PB of the indoor heat converter of chamber B is higher than 6 degrees centigrade (being when being).Shown in Fig. 6 to 9, the condition of the low temperature control program of control device 154 decontamination chamber B, and the indoor heat converter of chamber B is set to its normal refrigerating operaton state.Promptly start compressor, the rotating speed of outdoor blowers 41 returns to carries out the preceding high or low rotating speed of low temperature control program, first, second by-passing valve 101,102 cuts out, and the indoor blower of chamber B is by setting the rotating speed air blast, and B corresponding electric control expansion valve 131 in chamber moves to 250 grades.At last, the execution in step S35 retry Xingqi subsequent step of laying equal stress on.
In addition, when temperature T PA, the TPB of the indoor heat converter of chamber A, B all are higher than 6 degrees centigrade, move to 210 grades with the corresponding electric control expansion valve 130,131 of chamber A, B, two rooms freeze simultaneously.
According to as mentioned above, composite air conditioner low temperature control method of the present invention has the following advantages: no matter how many quantity or refrigerating capacitys of operating indoor set be, in the first to the 1 step of low temperature control program, what detected is the mean temperature of the indoor heat converter of indoor set in service, to control by-passing valve according to the order of sequence, electric control expansion valve, outdoor blowers and compressor, thus prevent that indoor set from freezing, form the optimum cycle refrigeration; When the indoor set of each chamber refrigerating operaton is loaded greatly, close by-passing valve, with the maximum refrigerating capacity in room between how realizing; The room freezes and loads when inequality between many, in the 4th step of low temperature control program, the electric control expansion valve of corresponding indoor set is controlled to be certain open degree (180 grades), thereby has prevented that the chamber blower fan from freezing, simultaneously, allow the indoor heat exchanger of other normal operation carry out normal refrigeration program.
Claims (7)
- Off-premises station can connect one or more indoor set, the low temperature control method of composite air conditioner that a plurality of rooms are freezed, comprise step:Carry out a room refrigerating operation, its electric control expansion valve with ongoing indoor set open to a predetermined opening degree adapting to the quantity of operating indoor set, thereby by operation indoor set control refrigerant flow; AndCarry out the low temperature control program, in the operating process of when it prevents every indoor heat converter low temperature, freezing,, control by-passing valve according to the order of sequence according to the variations in temperature of operating indoor heat converter, electric control expansion valve, outdoor blowers and compressor, wherein said low temperature control program comprises step:The first step of low temperature control program: when the time that an indoor heat converter remains below first design temperature surpasses a given time value, open second by-passing valve;Second step of low temperature control program: after executing first step, when the time that this indoor heat converter remains below second design temperature surpasses a given time value, open first by-passing valve;The third step of low temperature control program: after executing second step, when indoor heat converter keeps below the 3rd design temperature, the rotating speed of change outdoor blowers (rev/min); AndThe 4th step of low temperature control program: after executing third step, when the time that indoor heat converter remains below the 4th design temperature surpasses a given time value, close compressor.
- 2. the low temperature control method of composite air conditioner according to claim 1, it is characterized in that in the low temperature control program, comprise that also an operation returns step, when the temperature of indoor heat converter is higher than default low temperature and returns temperature, carry out normal refrigerating operaton, make by-passing valve, electric control expansion valve, outdoor blowers and compressor are back to normal refrigerating operaton state.
- 3. the low temperature control method of composite air conditioner according to claim 1 and 2 is characterized in that the temperature of each operating indoor heat converter is controlled to be the mean temperature of indoor heat converter when a plurality of rooms refrigeration.
- 4. the low temperature control method of composite air conditioner according to claim 1 and 2, it is characterized in that outdoor blowers rotary speed (rev/min) determine by outdoor temperature.
- Off-premises station can connect one or more indoor set, the low temperature control method of composite air conditioner that a plurality of rooms are freezed, comprise step;Carry out a plurality of rooms refrigerating operation, it is by opening the predetermined opening degree of electric control expansion valve to adapting to the quantity of indoor set in service, thereby the refrigerant flow of operating indoor set is flow through in control;Carry out the first step of low temperature control program: when the time that the mean temperature of a plurality of indoor heat converters remains below its first design temperature surpasses a given time value, open second by-passing valve;Carry out second step of low temperature control program: after executing first step, when the time that the mean temperature of indoor heat converter remains below second design temperature surpasses a given time value, open first by-passing valve;Carry out the third step of low temperature control program: after executing second step, when the time that the mean temperature of indoor heat converter remains below the 3rd design temperature surpasses a given time value, change outdoor blowers rotating speed (rev/min); AndCarry out the 4th step of low temperature control program: after executing third step, when the time that the temperature of any one indoor heat converter remains below the 4th design temperature surpasses a given time value, change the opening degree of the electric control expansion valve of respective chambers machine.
- 6. the low temperature control method of composite air conditioner according to claim 5, it is characterized in that in the 4th step of low temperature control program, when the time that the temperature of each indoor heat converter remains below the 4th design temperature surpasses a given time value, close compressor.
- 7. the low temperature control method of composite air conditioner according to claim 6, it is characterized in that in the 4th step of low temperature control program, compressor is in closed condition, close outdoor blowers, change the opening degree of the electric control expansion valve of all operating indoor sets simultaneously, to adapt to the low temperature control program.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR9924738 | 1999-06-28 | ||
| KR1019990024738A KR100333395B1 (en) | 1999-06-28 | 1999-06-28 | low-temperature control operation method of multitude-type air conditioner |
| KR99-24738 | 1999-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1290838A CN1290838A (en) | 2001-04-11 |
| CN1130532C true CN1130532C (en) | 2003-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00100877A Expired - Fee Related CN1130532C (en) | 1999-06-28 | 2000-02-17 | Composite air conditioner low temperature control method |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR100333395B1 (en) |
| CN (1) | CN1130532C (en) |
| ES (1) | ES2156772B1 (en) |
| FR (1) | FR2795492B1 (en) |
| IT (1) | IT1307615B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019199385A1 (en) * | 2018-04-13 | 2019-10-17 | Carrier Corporation | Method of defrosting a multiple heat absorption heat exchanger refrigeration system |
| WO2023110197A1 (en) * | 2021-12-13 | 2023-06-22 | Audi Ag | Method for operating a refrigerant circuit of a motor vehicle and motor vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100723945B1 (en) * | 2005-12-30 | 2007-05-31 | 위니아만도 주식회사 | Method for preventing freezing of air-conditioner |
| CN101592387B (en) * | 2008-05-29 | 2013-09-25 | 乐金电子(天津)电器有限公司 | Method for controlling indoor machine during heating of multi-connected central air conditioner |
| CN101614430B (en) * | 2008-06-24 | 2013-09-25 | 乐金电子(天津)电器有限公司 | Method for controlling electromagnetic valve of tri-zone air conditioner indoor unit |
| CN103148652B (en) * | 2013-03-06 | 2015-06-17 | 四川长虹电器股份有限公司 | Control method, control device and refrigeration system |
| KR102203213B1 (en) * | 2014-04-25 | 2021-01-14 | 엘지전자 주식회사 | A control method for air conditioner |
| CN104121729B (en) * | 2014-07-30 | 2017-02-15 | 刘雄 | Refrigerating fluid flowing direction conversion device |
| CN104729018B (en) * | 2015-03-18 | 2017-05-10 | 广东美的制冷设备有限公司 | Air-conditioner and control method and control device of air-conditioner |
| CN107289662B (en) * | 2017-07-17 | 2019-07-19 | 河南恒天润景环境科技有限公司 | A kind of control method of low-temperature air source heat pump unit outdoor machine fan motor |
| CN109654686B (en) * | 2018-12-20 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioner control method, air conditioner and computer readable storage medium |
| CN110793159B (en) * | 2019-11-19 | 2021-10-26 | 宁波奥克斯电气股份有限公司 | Air conditioner refrigeration anti-freezing protection control method and device and air conditioner |
| CN114322253B (en) * | 2021-12-20 | 2023-12-19 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5092134A (en) * | 1989-08-18 | 1992-03-03 | Mitsubishi Denki Kabushiki Kaisha | Heating and cooling air conditioning system with improved defrosting |
| US5237833A (en) * | 1991-01-10 | 1993-08-24 | Mitsubishi Denki Kabushiki Kaisha | Air-conditioning system |
| KR950002921Y1 (en) * | 1991-01-30 | 1995-04-17 | 삼성전자 주식회사 | Controlling circuit of multi-air conditioner |
| JPH06249484A (en) * | 1993-02-24 | 1994-09-06 | Daikin Ind Ltd | Air conditioning device |
| JPH07208835A (en) * | 1994-01-17 | 1995-08-11 | Hitachi Ltd | Freezing air conditioner |
| US5551248A (en) * | 1995-02-03 | 1996-09-03 | Heatcraft Inc. | Control apparatus for space cooling system |
| KR0142989B1 (en) * | 1995-07-25 | 1998-08-01 | 구자홍 | Refrigerant control method of multi-room aircon |
| JPH09126601A (en) * | 1995-10-27 | 1997-05-16 | Matsushita Electric Ind Co Ltd | Controller for air conditioner |
| KR970059639A (en) * | 1996-01-30 | 1997-08-12 | 구자홍 | Operation control method of multi air conditioner |
| KR100210079B1 (en) * | 1996-10-26 | 1999-07-15 | 윤종용 | Airconditioner indoor device single operating device |
| KR19990084384A (en) * | 1998-05-06 | 1999-12-06 | 구자홍 | Low temperature freeze cycle of multi air conditioner |
-
1999
- 1999-06-28 KR KR1019990024738A patent/KR100333395B1/en not_active IP Right Cessation
- 1999-12-16 ES ES009902751A patent/ES2156772B1/en not_active Expired - Fee Related
- 1999-12-17 FR FR9915966A patent/FR2795492B1/en not_active Expired - Fee Related
- 1999-12-20 IT IT1999RM000768A patent/IT1307615B1/en active
-
2000
- 2000-02-17 CN CN00100877A patent/CN1130532C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019199385A1 (en) * | 2018-04-13 | 2019-10-17 | Carrier Corporation | Method of defrosting a multiple heat absorption heat exchanger refrigeration system |
| WO2023110197A1 (en) * | 2021-12-13 | 2023-06-22 | Audi Ag | Method for operating a refrigerant circuit of a motor vehicle and motor vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2795492A1 (en) | 2000-12-29 |
| FR2795492B1 (en) | 2002-08-02 |
| ITRM990768A1 (en) | 2001-06-20 |
| KR20010004127A (en) | 2001-01-15 |
| ES2156772B1 (en) | 2002-01-16 |
| IT1307615B1 (en) | 2001-11-14 |
| KR100333395B1 (en) | 2002-04-24 |
| CN1290838A (en) | 2001-04-11 |
| ES2156772A1 (en) | 2001-07-01 |
| ITRM990768A0 (en) | 1999-12-20 |
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