CN107289681A - A kind of handpiece Water Chilling Units control method of refrigerant flow - Google Patents
A kind of handpiece Water Chilling Units control method of refrigerant flow Download PDFInfo
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- CN107289681A CN107289681A CN201710487676.1A CN201710487676A CN107289681A CN 107289681 A CN107289681 A CN 107289681A CN 201710487676 A CN201710487676 A CN 201710487676A CN 107289681 A CN107289681 A CN 107289681A
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
Abstract
The invention discloses a kind of handpiece Water Chilling Units control method of refrigerant flow, in handpiece Water Chilling Units running, the real-time calculating current of controller occupies percentage of current RLA at full capacity；Meanwhile, according to current set state, corresponding volume flow is determined from working conditions of compressor with the corresponding map relation of the volume flow of main throttling arrangement；Then percentage of current RLA and volume flow at full capacity are occupied according to electric current and determines that corresponding target level is interval；Finally, controller application PID control method changes adjust automatically condenser liquid level target according to compressor load, by the target control of condenser liquid level in corresponding condenser target level is interval, so as to indirect control evaporator liquid level.Solve the problem of performance is low under the lower sub-load of traditional liquid level control, improve evaporator liquid level can not stability contorting defect, improve the heat exchange efficiency of evaporator.
Description
Technical field
The present invention relates to cooling heat exchange technical field, and in particular to a kind of handpiece Water Chilling Units control method of refrigerant flow.
Background technology
With water chilling unit energy-saving product standard GB19577 issue, the concept of comprehensive performance evaluation is introduced, sub-load
Efficiency is increasingly taken seriously.Energy-saving index is also the evaluation that synthetic load performance evaluation is changed to by evaluating at full capacity.
Traditional control method of refrigerant flow uses condenser liquid level sensor（Or evaporator liquid level sensor）Coordinate electricity
Sub- expansion valve EXV is used as hardware foundation, the liquid level target of fixed condenser along with the combination of controller（Namely in the prior art
Liquid level in, target level is always constant）, electric expansion valve EXV is adjusted by PID and realizes fixed liquid level target.
The drawbacks of this scheme, is：Under part load condition, flooded evaporator is due to the declines of pool boiling, in evaporator,
The liquid level reduction of matchmaker, part heat exchanger tube is not contacted with refrigerant, can not now be carried out the control that liquid level target is definite value, thus be led
Cause heat exchange efficiency to deteriorate, cause unit performance under sub-load poor.Such case is under 50%, 25% load（Load takes load
Ratio）, difference is the most obvious.
The content of the invention
The technical problem to be solved in the present invention is：A kind of handpiece Water Chilling Units control method of refrigerant flow is provided, tradition is solved
The problem of performance is low under sub-load under Liquid level, improves the heat exchange efficiency of evaporator.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of handpiece Water Chilling Units control method of refrigerant flow, the handpiece Water Chilling Units at least include compressor, condenser, evaporator, control
The liquid level sensor that device processed, condenser side are set, and the main throttling arrangement set between condenser and evaporator；Its feature
It is：
Condenser liquid level when setting compressor at full capacity occupies condenser liquid level the ratio of fully loaded liquid level as highest liquid level target
Example is divided at least two different target levels intervals from highest liquid level target to minimum liquid level target, and determines liquid including one
Position control interval and at least one liquid level variable control interval, determine the interval starting point of liquid level and are more than or equal to liquid level variable interval end
Point；Accordingly, by compressor load according to load parameter occupy at full capacity percentage by 0 to being divided at least two at full capacity not
Same load setting a, load setting is interval corresponding with determining Liquid level, at least another load setting and liquid level variable control zone
Between correspondence；
In handpiece Water Chilling Units running, controller calculates and judges that compressor load is interval in real time, and selection Liquid level mode is simultaneously
Determine that corresponding target level is interval according to compressor load interval；Controller changes according to compressor load, using PID control
Method adjust automatically condenser liquid level is reached in corresponding condenser target level interval, so as to indirect control evaporator liquid level.
Further, the interval division of the target level need to ensure that evaporator under full capacity retains most of refrigerant
Within the condenser, and under fraction percentage loading condiction, most of refrigerant is placed in evaporator；Condenser liquid level is minimum
Liquid level target need to be more than 0.
Further, compressor load interval is generally corresponding to as follows with condenser liquid level target interval：
Compressor load interval carries out determining liquid level Liquid level to determine during Liquid level interval by definite value of highest liquid level target；
When compressor load interval is liquid level variable control interval, liquid level variable control interval is divided at least three different loads
Interval, respectively selection enters, and realizes liquid level variable control mode.
Further, three different load setting difference are as follows：
When compressor is in the first load setting, the first liquid level target interval of correspondence is：Liquid level target interval minimum liquid level target
~the first grade of liquid level target.
When compressor is in the second load setting, the second liquid level target interval of correspondence is：First grade of liquid level target~the second
Shelves liquid level target；
When compressor is in three load settings, the 3rd liquid level target interval of correspondence is：Second gear liquid level target~highest liquid level
Target；
The terminal of the 3rd load setting starting point interval with determining Liquid level is overlapped as critical load.
Further, compressor load is weighed by compressor current occupies percentage of current at full capacity, accordingly will pressure
Contracting machine load occupies percentage at full capacity according to load parameter and is divided at least two load settings；Or, compressor load by
Evaporator or condenser turnover water temperature difference occupy the turnover water temperature difference percentage of evaporator or condenser when at full capacity to weigh, phase
That answers according to load parameter occupies percentage at full capacity by compressor load to be divided at least two different loads interval.
Further, the first load setting is 0%~50%；Second load setting is 50%~75%；3rd load setting is
75%~critical load；Determining Liquid level interval is：Critical load~100%；Corresponding, the first liquid level target interval is 25%
~35%；Second liquid level target interval is：35%~40%；3rd liquid level target interval is：45%~50%.
Further, according to current set state, controller calculates corresponding volume flow under the state；Then according to pressure
Contracting machine load setting and volume flow determine accurate condenser liquid level target from liquid level target interval.
Further, working conditions of compressor map corresponding with the volume flow of main throttling arrangement is set up according to different compressors
Relation is simultaneously stored in the controller；Working conditions of compressor map relation corresponding with main throttling arrangement volume flow is：
V ==f（A, IGV, S）；Wherein, volume flow V and A, IGV, S are positive correlation, i.e. volume flow V with A, IGV,
S increase and increase；Wherein, A is the suction and discharge temperature of compressor suction and exhaust ports, and IGV is compressor inlet stator circulation area,
S is compressor rotary speed.
Further, the PID control method step is：
After given liquid level target interval, controller is filled according to different liquid level target intervals using the main throttling of pid control algorithm regulation
The aperture put；The aperture of main throttling arrangement carries out PID regulations according to current level and the interval difference of target level, controls cold
Condenser liquid level is in the range of desired value ± 3%；Evaporator liquid level is adjusted by adjusting condenser liquid level, it is ensured that evaporator effectiveness.
Further, it is rapid to carry out protectiveness regulation, quick regulation electronic expansion when evaporator or condenser liquid level are abnormal
Valve EXV and compressor load；When liquid level is abnormal, unit will be fast by judging the numerical value of evaporating pressure and condensing pressure
The aperture of the whole electric expansion valve of velocity modulation, to ensure the safety of compressor.
Further, the main throttling arrangement is electric expansion valve EXV.
Thus, there is provided a set of brand-new handpiece Water Chilling Units control method of refrigerant flow by the present invention.Set using in condenser side
Liquid level sensor, coordinates EXV electric expansion valves as main throttling arrangement, while the liquid level target of condenser is according to operating condition
Change adjustment in real time.Solve under traditional liquid level control, the problem of performance is low under sub-load.Pass through Algorithm of Active Control, PLC
The load of accurate anticipation compressor, calculates compressor condenser target level under different load conditions, different compressor and
Under different operating modes, target level is interval different；Simultaneously dynamic object is realized using classical pid control algorithm.Set at full capacity
Determine highest liquid level target, unit running process judges compressor load, be progressively adjusted to the corresponding condenser liquid level mesh of the operating mode
Mark.Enough refrigerants are flowed into evaporator, evaporating pressure is improved, efficiency is improved.This method is centrifuged particularly with magnetic suspension frequency conversion
Unit, it is better.
Relative to prior art, the difficult point of traditional flooded evaporator is to control evaporator absorbing gas belt liquid risk.Steam
Send out device Liquid level to control for direct liquid level, condenser Liquid level is such a to realize by indirect control evaporator liquid level
In the case of because evaporator level fluctuation acutely, under the conditions of working conditions change, to avoid absorbing gas belt liquid, condenser liquid level is using indirect
It is inaccurate that control easily causes liquid level.And the present invention reaches accurate control by directly controlling condenser liquid level, while passing through control
Refrigeration condenser liquid level come control ensure evaporator liquid level in safe range, reduction compressor band liquid risk.Condenser liquid level control
Target processed changes automatically with compressor load, improves evaporator section load heat exchange efficiency.
Further, since during actual motion, actual liquid level is unstable caused by the change acutely of evaporator liquid level, so it is difficult to
Actual liquid level is compared with target level, needing the control law control of complexity makes evaporator liquid level stablize as early as possible.And this
Invention according to compressor under different IGV, rotating speed, the preferable apertures of the corresponding EXV of volume flow, establish working conditions of compressor with
The corresponding map relation of volume flow, foundation is provided for fast and stable control evaporator liquid level.
Finally, under the conditions of user side water temperature acute variation, the matching of electric expansion valve EXV aperture and liquid level target is difficult
Degree is big；It thus can not directly carry out PID control on an evaporator only by control electronic expansion valve opening, and the present invention is logical
Which kind of cross automatic identification compressor to be in the method for load setting to obtain liquid level target interval, by liquid level target and electronic expansion
The valve EXV accurate matching of aperture control.
Brief description of the drawings
The water chilling unit system that Fig. 1 one of embodiments of handpiece Water Chilling Units control method of refrigerant flow of the present invention are used
Structure chart.
Wherein, reference correspondence is as follows：Main power supply 1, start cabinet to compressor chamber main power supply 2, start cabinet 3, open
Cabinet is moved to the connection 4 between micro-control cabinet, micro-control cabinet 5, micro-control cabinet to the connection 6 between each electricity piece of unit, stop valve 7, liquid level
Sensor 8, condenser 9, air ventilation one-way valve 10, compressor 11, electric expansion valve 12, evaporator 13.
Fig. 2 is control flow chart of the invention.
Embodiment
Water chilling unit system structure such as Fig. 1 that the handpiece Water Chilling Units control method of refrigerant flow implemented according to the present invention is used
It is shown, mainly including condenser 9, evaporator 13, compressor 11, the micro-control cabinet 5 equipped with controller, wherein, condenser 9, evaporation
Device 13 is connected and stop valve 7 and electric expansion valve 12 is set on path, and the evaporator 13 of compressor 11 is connected, and compressor 11 passes through
Air ventilation one-way valve 10 is connected with condenser 9；Start the connection main power supply 1 of cabinet 3, and by starting cabinet to the main power supply of compressor chamber
2 are connected with compressor 11, start cabinet 3 and are connected by starting cabinet to the connection 4 between micro-control cabinet with the signal of micro-control cabinet 5, micro-control cabinet 5
It is connected by micro-control cabinet to the connection 6 between each electricity piece of unit with each sensor and valve control element signal.Main throttling arrangement is
Electric expansion valve 12.
Not shown in figure but those skilled in the art are it should be clear that also set up temperature sensor, pressure sensor
With compressor load sensor, preferable temperature sensor is arranged on compressor suction and exhaust ports in the present embodiment, and compressor load is passed
Sensor is arranged in micro-control cabinet 5.The effect of compressor load sensor is collection percentage of current, and temperature sensor effect is to adopt
Collect the suction and discharge temperature A, also pressure sensor collect and process machine suction and exhaust ports of compressor suction and exhaust ports pressure, come by this in terms of
The circulating mass of refrigerant of unit is calculated, the small explanation load of internal circulating load is small.Evaporator under full capacity, due to pool boiling acutely, simultaneously
The problem of in order to avoid absorbing gas belt liquid, is, it is necessary to which most of refrigerant is retained within the condenser.Under part load condition, pool boiling subtracts
It is weak, it is necessary to most of refrigerant is placed in evaporator, improve heat exchange efficiency.
The present invention according to different compressors, condenser liquid level when setting compressor at full capacity as highest liquid level target,
It is different that the ratio that condenser liquid level is occupied into fully loaded liquid level is divided at least two from highest liquid level target to minimum liquid level target
Target level it is interval, and determine including one that Liquid level is interval and at least one liquid level variable control interval, determine liquid level interval
Starting point is more than or equal to the interval terminal of liquid level variable；Accordingly, compressor load is occupied into percentage at full capacity according to load parameter
More interval at least two different loads are divided at full capacity than by 0, a load setting is interval corresponding with determining Liquid level, at least
Another load setting is corresponding with liquid level variable control interval；
In handpiece Water Chilling Units running, controller calculates and judges that compressor load is interval in real time, and selection Liquid level mode is simultaneously
Determine that corresponding target level is interval according to compressor load interval；Controller changes according to compressor load, using PID control
Method adjust automatically condenser liquid level is reached in corresponding condenser target level interval, so as to indirect control evaporator liquid level.
Compressor load interval is generally corresponding to as follows with condenser liquid level target interval：
Compressor load interval carries out determining liquid level Liquid level to determine during Liquid level interval by definite value of highest liquid level target；
Preferred compressed machine load setting carries out determining liquid level to determine during Liquid level interval by definite value deviation ± 2% of highest liquid level target
Position control；
When compressor load interval is liquid level variable control interval, liquid level variable control interval is divided at least three different loads
Interval, respectively selection enters, and realizes liquid level variable control mode.
Further, three different load setting difference are as follows：
When compressor is in the first load setting, the first liquid level target interval of correspondence is：Liquid level target interval minimum liquid level target
~the first grade of liquid level target.
When compressor is in the second load setting, the second liquid level target interval of correspondence is：First grade of liquid level target~the second
Shelves liquid level target；
When compressor is in three load settings, the 3rd liquid level target interval of correspondence is：Second gear liquid level target~highest liquid level
Target；
The terminal of the 3rd load setting starting point interval with determining Liquid level is overlapped as critical load.Preferably critical load of the invention
For a value in 75%~83%.
Compressor load is weighed by compressor current occupies percentage of current at full capacity, is accordingly pressed compressor load
Percentage at full capacity, which is occupied, according to load parameter is divided at least two load settings；Or, compressor load is by evaporator or cold
Condenser turnover water temperature difference occupies the turnover water temperature difference percentage of evaporator or condenser when at full capacity to weigh, accordingly will compression
Machine load occupies percentage at full capacity according to load parameter and is divided at least two different loads interval.
Specially：Compressor load is weighed by compressor current occupies percentage of current at full capacity, by compressor current
Occupy at full capacity that percentage of current by 0 at least two load settings are divided at full capacity, electric current occupies electric current percentage at full capacity
It is generally corresponding to as follows with condenser liquid level target interval than RLA：
When electric current occupies that percentage of current RLA is critical value~100% at full capacity, correspondence liquid level target interval is：Highest liquid level mesh
Target determines Liquid level；
Electric current occupy at full capacity percentage of current RLA be 75%~critical value when, correspondence liquid level target interval be：Second gear liquid level
Target~highest liquid level target；
Electric current occupy at full capacity percentage of current RLA be 50%~75% when, correspondence liquid level target interval be：First grade of liquid level target
~second gear liquid level target；
Electric current occupy at full capacity percentage of current RLA be 0%~50% when, correspondence liquid level target interval be：Liquid level target interval is most
Low liquid level target~the first grade liquid level target.
Or, compressor load occupies evaporator when at full capacity or condenser by evaporator or condenser turnover water temperature difference
Water temperature difference percentage is passed in and out to weigh, compressor load is interval at least two different loads are divided at full capacity by 0, this
When, compressor load is generally corresponding to as follows with condenser liquid level target interval：
Evaporator or condenser turnover water temperature difference occupy the turnover water temperature difference percentage of evaporator or condenser when at full capacity to face
During dividing value~100%, correspondence highest liquid level target determines Liquid level；
The turnover water temperature difference percentage that evaporator or condenser turnover water temperature difference occupy evaporator or condenser when at full capacity is 75%
During~critical value %, correspondence liquid level target interval 45%~50%；
The turnover water temperature difference percentage that evaporator or condenser turnover water temperature difference occupy evaporator or condenser when at full capacity is 50%
When~75%, correspondence liquid level target interval 35%~40%；
The turnover water temperature difference percentage that evaporator or condenser turnover water temperature difference occupy evaporator or condenser when at full capacity is 0%
When~50%, correspondence liquid level target interval 25%~35%.
Further, after liquid level interval is determined, according to current set state, controller calculates corresponding under the state
Volume flow；Then percentage of current RLA at full capacity and volume flow are occupied according to electric current and essence is determined from liquid level target interval
True condenser liquid level target.Calculating volume flow has different modes, and the present invention is further preferably according to different compressions
Machine is set up working conditions of compressor map relation corresponding with the volume flow of main throttling arrangement and stored in the controller；Working conditions of compressor
Map relation corresponding with main throttling arrangement volume flow is：
V ==f（A, IGV, S）；Wherein, volume flow V and A, IGV, S are positive correlation, i.e. volume flow V with A, IGV,
S increase and increase；Wherein, A is the suction and discharge temperature of compressor suction and exhaust ports, and IGV is compressor inlet stator circulation area,
S is compressor rotary speed.
After given liquid level target interval, electric expansion valve EXV aperture is according to current level and the interval difference of target level
Value carries out PID regulations, and control condenser liquid level is in the range of desired value ± 3%；According to different liquid level targets, pid control algorithm
Adjust main throttling arrangement electric expansion valve 12.
Therefore, in handpiece Water Chilling Units running of the present invention, controller by the percentage of current of compressor real time execution, with
And compressor inlet stator（Inlet guide vane, rear abbreviation IGV）Circulation area, compressor rotary speed S, compressor inhale
The load of the suction and discharge temperature A real-time judge compressors of exhaust outlet, is occupied at full capacity further according to volume flow and foregoing electric current
Percentage of current RLA confirms the liquid level target interval of current operating condition；Then active according to load, adjust condenser
Liquid level target, so that Indirect method evaporator liquid level, it is ensured that evaporator effectiveness.
Claims (10)
1. a kind of handpiece Water Chilling Units control method of refrigerant flow, the handpiece Water Chilling Units at least include compressor, condenser, evaporator,
The liquid level sensor that controller, condenser side are set, and the main throttling arrangement set between condenser and evaporator；It is special
Levy and be：
Condenser liquid level when setting compressor at full capacity occupies condenser liquid level the ratio of fully loaded liquid level as highest liquid level target
Example is divided at least two different target levels intervals from highest liquid level target to minimum liquid level target, and determines liquid including one
Position control interval and at least one liquid level variable control interval, determine the interval starting point of liquid level and are more than or equal to liquid level variable interval end
Point；Accordingly, by compressor load according to load parameter occupy at full capacity percentage by 0 to being divided at least two at full capacity not
Same load setting a, load setting is interval corresponding with determining Liquid level, at least another load setting and liquid level variable control zone
Between correspondence；
In handpiece Water Chilling Units running, controller calculates and judges that compressor load is interval in real time, and selection Liquid level mode is simultaneously
Determine that corresponding target level is interval according to compressor load interval；Controller changes according to compressor load, using PID control
Method adjust automatically condenser liquid level is reached in corresponding condenser target level interval, so as to indirect control evaporator liquid level.
2. handpiece Water Chilling Units control method of refrigerant flow according to claim 1, it is characterised in that：The target level is interval
Division need to ensure that evaporator under full capacity retains most of refrigerant within the condenser, and in fraction percentage loading condiction
Under, most of refrigerant is placed in evaporator；Condenser liquid level minimum liquid level target need to be more than 0.
3. handpiece Water Chilling Units control method of refrigerant flow according to claim 1, it is characterised in that：Compressor load it is interval with
Condenser liquid level target interval is generally corresponding to as follows：
Compressor load interval carries out determining liquid level Liquid level to determine during Liquid level interval by definite value of highest liquid level target；
When compressor load interval is liquid level variable control interval, liquid level variable control interval is divided at least three different loads
Interval, respectively selection enters, and realizes liquid level variable control mode.
4. handpiece Water Chilling Units control method of refrigerant flow according to claim 3, it is characterised in that：Three different loading zones
Between respectively it is as follows：
When compressor is in the first load setting, the first liquid level target interval of correspondence is：Liquid level target interval minimum liquid level target
~the first grade of liquid level target；
When compressor is in the second load setting, the second liquid level target interval of correspondence is：First grade of liquid level target~second gear liquid
Position target；
When compressor is in three load settings, the 3rd liquid level target interval of correspondence is：Second gear liquid level target~highest liquid level
Target；
The terminal of the 3rd load setting starting point interval with determining Liquid level is overlapped as critical load.
5. the handpiece Water Chilling Units control method of refrigerant flow according to one of claim 1-4, it is characterised in that：Compressor load
Weighed by compressor current occupies percentage of current at full capacity, compressor load is occupied according to load parameter completely born accordingly
Lotus percentage is divided at least two load settings；Or, compressor load is occupied by evaporator or condenser turnover water temperature difference
The turnover water temperature difference percentage of evaporator or condenser is weighed when at full capacity, accordingly by compressor load according to load parameter
Occupy percentage at full capacity and be divided at least two different loads interval.
6. handpiece Water Chilling Units control method of refrigerant flow according to claim 5, it is characterised in that：First load setting is 0%
~50%；Second load setting is 50%~75%；3rd load setting is 75%~critical load；Determining Liquid level interval is：Face
Boundary's load~100%；Corresponding, the first liquid level target interval is 25%~35%；Second liquid level target interval is：35%~40%；
3rd liquid level target interval is：45%~50%.
7. handpiece Water Chilling Units control method of refrigerant flow according to claim 6, it is characterised in that：According to current unit shape
State, controller calculates corresponding volume flow under the state；Then according to compressor load is interval and volume flow is from liquid level mesh
Accurate condenser liquid level target is determined during mark is interval.
8. handpiece Water Chilling Units control method of refrigerant flow according to claim 7, it is characterised in that：According to different compressors
Set up working conditions of compressor map relation corresponding with the volume flow of main throttling arrangement and store in the controller；Working conditions of compressor with
Main throttling arrangement volume flow corresponds to map relation：
V ==f（A, IGV, S）；Wherein, volume flow V and A, IGV, S are positive correlation, i.e. volume flow V with A, IGV,
S increase and increase；Wherein, A is the suction and discharge temperature of compressor suction and exhaust ports, and IGV is compressor inlet stator circulation area,
S is compressor rotary speed.
9. the handpiece Water Chilling Units control method of refrigerant flow according to claim 1 or 8, it is characterised in that：The PID control side
Method step is：
After given liquid level target interval, controller is filled according to different liquid level target intervals using the main throttling of pid control algorithm regulation
The aperture put；The aperture of main throttling arrangement carries out PID regulations according to current level and the interval difference of target level, controls cold
Condenser liquid level is in the range of desired value ± 3%；Evaporator liquid level is adjusted by adjusting condenser liquid level, it is ensured that evaporator effectiveness.
10. handpiece Water Chilling Units control method of refrigerant flow according to claim 9, it is characterised in that：Evaporator or condenser
It is rapid to carry out protectiveness regulation, quick regulation electric expansion valve EXV and compressor load when liquid level is abnormal；When liquid level is abnormal,
Unit will be by judging the numerical value of evaporating pressure and condensing pressure, the aperture of rapid adjustment electric expansion valve, to ensure pressure
The safety of contracting machine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112082293A (en) * | 2020-09-09 | 2020-12-15 | 珠海格力电器股份有限公司 | Throttle valve control method and device, compressed steam circulation system and air conditioner |
| CN112611119A (en) * | 2020-12-21 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Water chilling unit and control method |
| CN113720030A (en) * | 2020-05-26 | 2021-11-30 | 重庆美的通用制冷设备有限公司 | Air conditioner, control method, control device, and computer-readable storage medium |
| CN114111171A (en) * | 2021-11-12 | 2022-03-01 | 中国南方电网有限责任公司超高压输电公司昆明局 | Converter station cooling system and control method thereof |
| CN114995530A (en) * | 2022-07-14 | 2022-09-02 | 中国船舶重工集团公司第七一九研究所 | Intelligent control method, device and equipment for condensate water level and storage medium |
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| CN113720030A (en) * | 2020-05-26 | 2021-11-30 | 重庆美的通用制冷设备有限公司 | Air conditioner, control method, control device, and computer-readable storage medium |
| CN112082293A (en) * | 2020-09-09 | 2020-12-15 | 珠海格力电器股份有限公司 | Throttle valve control method and device, compressed steam circulation system and air conditioner |
| CN112611119A (en) * | 2020-12-21 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Water chilling unit and control method |
| CN114111171A (en) * | 2021-11-12 | 2022-03-01 | 中国南方电网有限责任公司超高压输电公司昆明局 | Converter station cooling system and control method thereof |
| CN114995530A (en) * | 2022-07-14 | 2022-09-02 | 中国船舶重工集团公司第七一九研究所 | Intelligent control method, device and equipment for condensate water level and storage medium |
| CN114995530B (en) * | 2022-07-14 | 2022-11-04 | 中国船舶重工集团公司第七一九研究所 | Condensate water level intelligent control method, device, equipment and storage medium |
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