CN104990211B - The control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion - Google Patents
The control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion Download PDFInfo
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- CN104990211B CN104990211B CN201510355617.XA CN201510355617A CN104990211B CN 104990211 B CN104990211 B CN 104990211B CN 201510355617 A CN201510355617 A CN 201510355617A CN 104990211 B CN104990211 B CN 104990211B
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Atmospheric Sciences (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to field of air conditioning, and in particular to a kind of control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion, step are as follows：Set target temperature during chilled water water outlet；Collection refrigeration total amount；Gather initial inflow temperature；Start the compressor that refrigerating capacity is maximum in Central air-conditioning unit, record the difference of initial inflow temperature and current inflow temperature, record the difference of initial inflow temperature and target temperature, make the refrigeration demand amount of whole system；Remaining load is then calculated, when remaining load is more than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then starts second largest compressor and is allowed to run to optimal energy efficiency state；When remaining load is less than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then start a compressor close with this refrigerating capacity, and residual compression machine is reached optimal energy efficiency state successively；The leaving water temperature and target temperature for detecting chilled water contrast；Judge whether air-conditioning reaches halt condition.
Description
Technical field
The present invention relates to field of air conditioning, and in particular to a kind of controlling party of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion
Method, reach more satisfactory energy-conservation and refrigeration in the operation kind of whole unit.
Background technology
As society is to the demand of energy-conservation, building energy conservation accounting is larger, and in building energy conservation, air-conditioning accounting is maximum
's.In air-conditioning, there are many new power-saving technologies in particularly central air-conditioning, but relatively advanced at present is magnetic levitation technology
Application, and the centrifugal central air-conditioning of frequency conversion magnetic levitation is commercially a large amount of uses.
The centrifugal Central air-conditioning unit of frequency conversion magnetic levitation, it is a kind of Central air-conditioning unit, and its compressor uses frequency conversion magnetic
Suspension centrifugal compressor, refrigerant are that refrigeration industry often uses refrigerant, and refrigerating medium is water or other fluids.Central air-conditioning unit leads to
Overcompression refrigerant first turns cold refrigerating medium, then allows refrigerating medium to circulate indoors and reaches refrigeration purpose to reduce room temperature.
Central air-conditioning unit adjusts the frequency of compressor according to currently going out and (entering) coolant-temperature gage and set water temperature degree.To meet
Bigger refrigerating capacity, often central air conditioner main machine can use the combination of multiple compressors.Have per compressor fixed
Refrigerating capacity, rotating speed is controlled by adjusting the frequency of compressor electric motor, so as to control the refrigerating capacity of compressor.In order to show to compress
The refrigerating capacity state of machine is more in the industry to be represented using load percentage.The cooling load of general compressor represents from 0-100%
Minimum arrives maximum cooling capacity.The important indicator that can air-conditioning be embodied save is Energy Efficiency Ratio.Energy Efficiency Ratio is in declared working condition and regulation
Under the conditions of, actual refrigerating capacity is with actually entering power ratio when air-conditioning carries out refrigerating operaton.This is a composite target, reflection
The refrigerating capacity that unit input power is converted into during operation of air conditioner.Air-conditioning Energy Efficiency Ratio is bigger, in the refrigerating capacity equal time
The electric energy of province is more.
Converter technique is more and more used for Large Central Air Conditioning System, how to control the method for operation of frequency-changeable compressor and also has very
A variety of presence, control mode are got well with badly directly affecting refrigeration and energy-saving effect.
Currently used more is exactly PID control (being made up of proportional unit P, integral unit I and differentiation element D) and returns
Difference control.When actual temperature is bigger than target temperature, the refrigerating capacity of compressor is improved by lifting the frequency of compressor electric motor,
But frequency-changeable compressor is not that optimum energy-saving effect is attained by under any frequency, when particularly multigroup compressor head combines, no
The highest energy efficiency per compressor can be played.
The content of the invention
According to the deficiencies in the prior art, the present invention provides a kind of Energy Saving Control mode, by every, rational proportion compressor
The load of compressor makes the whole unit reach Energy Efficiency Ratio highest.
The technical scheme is that：A kind of control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion, hardware system
System includes several compressors for condenser, by-passing valve, evaporator and the parallel connection being sequentially connected, the exit of condenser and evaporation
The entrance of device is connected, and between be provided with electric expansion valve；Compressor, condenser and evaporator are defeated with external computer controller
Enter end to be connected, the output end of computer controller is connected with electric expansion valve；Refrigerant flows in circulating line, control method step
It is rapid as follows：
(1) target temperature during chilled water water outlet is set；
(2) the refrigeration total amount of all compressors of Central air-conditioning unit is gathered；
(3) the initial inflow temperature of the chilled water before starting per compressor is gathered；
(4) start the compressor that refrigerating capacity is maximum in Central air-conditioning unit, be allowed to run to the optimal efficiency of the compressor
State, after inflow temperature is stable, the current inflow temperature of chilled water is recorded, records initial inflow temperature and current inflow temperature
Difference, record the difference of initial inflow temperature and target temperature, and whole system is made according to the ratio of two differences
Refrigeration demand amount；
(5) ratio of refrigeration demand amount and Central air-conditioning unit refrigeration total amount is gathered, when the ratio is more than 1, is opened complete
Portion's compressor full load operation, repeat step (3)；When the ratio is less than 1, then by the maximum compressor of a wherein refrigerating capacity
Optimal energy efficiency state is run to, records now refrigerating capacity；When now refrigerating capacity is more than refrigeration demand amount, then other pressures are not started
Contracting machine, the water temperature regulation and control of itself are carried out to current compressor；When now refrigerating capacity is less than refrigeration demand amount, then residual negative is calculated
Lotus, when remaining load is more than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then starts second largest compressor and be allowed to
Run to optimal energy efficiency state；When remaining load is less than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then start one
Platform and the close compressor of this refrigerating capacity, and residual compression machine is reached optimal energy efficiency state successively；
(6) leaving water temperature and target temperature for detecting chilled water contrast；, be to pressure when leaving water temperature is higher than target temperature
Contracting machine loads, then is carried in Energy Efficiency Ratio highest compressor under equal refrigerating capacity；It is right when leaving water temperature is less than target temperature
Compressor off-load, then off-load minimum compressor of Energy Efficiency Ratio under equal refrigerating capacity；
(7) judge whether air-conditioning reaches halt condition, when being not reaching to halt condition, continue cycling through step (6)；When up to
To after halt condition, air-conditioning is stopped.
The number of several described compressors is preferably 3-10.
Wherein, the halt condition of different manufacturers is different, and when Central air-conditioning unit regulation and control state is opened, then it is right always to need
The disengaging coolant-temperature gage of chilled water carries out contrast judgement, so as to control compressor loads or off-load, so as to ensure Central air-conditioning unit
Normal operation.
In the present invention, the refrigerating capacity of compressor is improved by lifting the frequency of compressor electric motor, plays every compression
The highest energy efficiency of machine.By load of the rational proportion per compressor, so that whole Central air-conditioning unit reaches highest energy efficiency
Than reaching optimal energy efficiency state.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is the hardware system structure schematic diagram of the present invention；
Fig. 3 is the Energy Efficiency Ratio schematic diagram of the present invention；
In figure：1：Compressor, 2：Condenser, 3：Evaporator, 4：Controller, 5：Electric expansion valve, 6：By-passing valve, Ts：Mesh
Mark temperature, Q：Refrigeration total amount, T1：Initial inflow temperature, T2：Current inflow temperature, △ T1：Initial inflow temperature is with working as advancing water
The difference of temperature, △ Ts：The difference of initial inflow temperature and target temperature, Qa：Refrigeration demand amount, R:Refrigeration demand amount and refrigeration
The ratio of total amount, X：Energy Efficiency Ratio, Y：Live load, a%：Highest energy efficiency ratio.
Embodiment
Illustrate to be described in further detail the present embodiment below in conjunction with the accompanying drawings, but the invention is not limited in specific reality
Apply example.
Embodiment 1：
A kind of control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion, hardware system include the condensation being sequentially connected
Device 2, by-passing valve 6, evaporator 3 and 3 compressors 1 of parallel connection, the exit of condenser 2 are connected with the entrance of evaporator 3, and it
Between be provided with electric expansion valve 5；Compressor 1, condenser 2 and evaporator 3 are connected with the input of external computer controller 4, electricity
The output end of brain controller 4 is connected with electric expansion valve 5；Refrigerant flows in circulating line, and control method step is as follows：
(1) target temperature Ts during chilled water water outlet is set；
(2) the refrigeration total amount Q=Q1+Q2+Q3 of all compressors 1 of Central air-conditioning unit is gathered；
(3) the initial inflow temperature T1 of the chilled water before starting per compressor 1 is gathered；
(4) start the compressor 1 that refrigerating capacity is maximum in Central air-conditioning unit, be allowed to run to the most Canon of the compressor 1
Effect state, after inflow temperature is stable, the current inflow temperature T2 of chilled water is recorded, record initial inflow temperature T1 and advance with working as
Coolant-temperature gage T2 difference △ T1, record initial inflow temperature T1 and target temperature Ts difference △ Ts；And according to △ T1/ △ Ts systems
Make the refrigeration demand amount Qa of whole system；
(5) refrigeration demand amount Qa and Central air-conditioning unit refrigeration total amount Q ratio R are gathered, when R is more than 1, is opened all
The full load of compressor 1 is run, repeat step (3)；When R is less than 1, then a wherein maximum compressor 1 of refrigerating capacity is run
To optimal energy efficiency state a1%, now refrigerating capacity Qa1=a1% × Q1 is recorded；When this three compressor is run, in every pressure
Load condition when the optimal Energy Efficiency Ratio of contracting machine is a1%, a2%, a3% respectively, first allows the maximum pressure of wherein refrigerating capacity
Contracting machine 1 runs to optimal energy efficiency state a1%, and refrigerating capacity at this moment is Qa1=a1% × Q1, when Qa1 is more than Qa, then no longer
Start other compressors 1, carrying out the water temperature of itself to current compressor 1 regulates and controls；When Qa1 is less than in Qa, then residual negative is calculated
Lotus, when remaining load is more than Qa2=a2% × Q2 and Qa3=a3% × Q3, then starts second largest compressor 1 and be allowed to run
To a2%；When remaining load is less than Qa2 and Qa3, then start a compressor 1 close with this refrigerating capacity, i.e., second
Compressor restarts the 3rd compressor to a3% to after a2%；
(6) leaving water temperature and target temperature Ts for detecting chilled water contrast；, when leaving water temperature is higher than target temperature Ts
Compressor 1 is loaded, then is carried in Energy Efficiency Ratio highest compressor 1 under equal refrigerating capacity；When leaving water temperature is less than target temperature
, be to the off-load of compressor 1 during Ts, then the minimum compressor 1 of off-load Energy Efficiency Ratio under equal refrigerating capacity；
(7) judge whether air-conditioning reaches halt condition, when being not reaching to halt condition, continue cycling through step (6)；When up to
To after halt condition, air-conditioning is stopped.
Wherein, the efficiency of centrifugal compressor 1 follows Fig. 3 curve：From curve as can be seen that under real-time working condition,
Energy Efficiency Ratio is not highest when minimum and maximum load, only when sub-load is a%, just reaches highest energy efficiency ratio,
This value of different compressors 1 is different.
In the present invention, the refrigerating capacity of compressor 1 is improved by lifting the frequency of the motor of compressor 1, plays every pressure
The highest energy efficiency of contracting machine 1.By load of the rational proportion per compressor 1, so that whole Central air-conditioning unit reaches highest
Energy Efficiency Ratio, reach optimal energy efficiency state.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art,
Without departing from the structure of the invention, several modifications and improvements can also be made, these are implemented all without the present invention is influenceed
Effect and practical applicability.
Claims (2)
1. a kind of control method of the centrifugal Central air-conditioning unit of multi-machine heads frequency conversion, hardware system includes the condensation being sequentially connected
Device, by-passing valve, evaporator and several compressors of parallel connection, the exit of condenser are connected with the entrance of evaporator, and between
It is provided with electric expansion valve；Compressor, condenser and evaporator are connected with the input of external computer controller, computer controller
Output end be connected with electric expansion valve；Refrigerant flows in circulating line, it is characterised in that：Control method step is as follows：
(1) target temperature during chilled water water outlet is set；
(2) the refrigeration total amount of all compressors of Central air-conditioning unit is gathered；
(3) the initial inflow temperature of the chilled water before starting per compressor is gathered；
(4) start the compressor that refrigerating capacity is maximum in Central air-conditioning unit, be allowed to run to the optimal energy efficiency state of the compressor,
After inflow temperature is stable, the current inflow temperature of chilled water is recorded, records the difference of initial inflow temperature and current inflow temperature
Value, the difference of initial inflow temperature and target temperature is recorded, and the refrigeration of whole system is made according to the ratio of two differences
Demand；
(5) ratio of refrigeration demand amount and Central air-conditioning unit refrigeration total amount is gathered, when the ratio is more than 1, opens all pressures
Contracting machine full load is run, repeat step (3)；When the ratio is less than 1, then by the maximum compressor operating of a wherein refrigerating capacity
To optimal energy efficiency state, now refrigerating capacity is recorded；When now refrigerating capacity is more than refrigeration demand amount, then other compressions are not started
Machine, the water temperature regulation and control of itself are carried out to current compressor；When now refrigerating capacity is less than refrigeration demand amount, then residual negative is calculated
Lotus, when remaining load is more than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then starts second largest compressor and be allowed to
Run to optimal energy efficiency state；When remaining load is less than residual compression machine in the refrigerating capacity of optimal energy efficiency state, then start one
Platform and the close compressor of this refrigerating capacity, and residual compression machine is reached optimal energy efficiency state successively；
(6) leaving water temperature and target temperature for detecting chilled water contrast；, be to compressor when leaving water temperature is higher than target temperature
Loading, then be carried in Energy Efficiency Ratio highest compressor under equal refrigerating capacity；, be to compression when leaving water temperature is less than target temperature
Machine off-load, then off-load minimum compressor of Energy Efficiency Ratio under equal refrigerating capacity；
(7) judge whether air-conditioning reaches halt condition, when being not reaching to halt condition, continue cycling through step (6)；Stop when reaching
After machine condition, air-conditioning is stopped.
2. a kind of control method of centrifugal Central air-conditioning unit of multi-machine heads frequency conversion according to claim 1, its feature exist
In：The number of several described compressors is 3-10.
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| CN113266923B (en) * | 2021-05-26 | 2022-10-14 | 广东申菱商用空调设备有限公司 | Control method and control device of compressor |
| CN113266924B (en) * | 2021-05-26 | 2022-12-16 | 广东申菱商用空调设备有限公司 | Control method and control device of compressor |
| CN113108393B (en) * | 2021-05-31 | 2022-04-12 | 南通华信中央空调有限公司 | Energy adjusting method for air-conditioning water system |
| CN113375292B (en) * | 2021-06-30 | 2023-04-28 | 特灵空调系统(中国)有限公司 | Control method, air conditioning system, and computer-readable storage medium |
| CN116202189A (en) * | 2021-12-01 | 2023-06-02 | 重庆美的通用制冷设备有限公司 | Control method and device of air conditioning unit and electronic equipment |
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