CN106440549B - A kind of control system improving central air conditioner system comprehensive energy efficiency ratio - Google Patents
A kind of control system improving central air conditioner system comprehensive energy efficiency ratio Download PDFInfo
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- CN106440549B CN106440549B CN201610371500.5A CN201610371500A CN106440549B CN 106440549 B CN106440549 B CN 106440549B CN 201610371500 A CN201610371500 A CN 201610371500A CN 106440549 B CN106440549 B CN 106440549B
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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
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F25B49/00—Arrangement or mounting of control or safety devices
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F25B2600/25—Control of valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of control systems for improving central air conditioner system comprehensive energy efficiency ratio, including central control board and the Centralized Controller being electrically connected, it further include that the chilled water region hydraulic equilibrium being electrically connected with central control board and load judge subsystem in advance, cooling water radiating requirements and load judge subsystem in advance, chilled water pump and cooling water pump interactive mode vari- able flow control subsystem, and above three subsystem is electrically connected with Centralized Controller respectively, Centralized Controller is respectively and freezing host, refrigerating water pump, cooling pump, cooling tower, electric control valve, electric switching valve is electrically connected, the present invention is control target with whole system, to water pump, blower, the comprehensive energy efficiency ratio of the equipment such as refrigeration host computer comprehensively consider and whole control, preferably control central air conditioner system, extend the service life of system equipment, it is not influencing to make The energy saving space of central air conditioner system is excavated with depth under the premise of comfort level, improves central air conditioner system comprehensive energy efficiency ratio.
Description
Technical field
The present invention relates to field of central air-conditioning more particularly to a kind of energy-saving management system of central air conditioner.
Background technique
Central air-conditioning is essential component part, but central air-conditioning is also to build in the modern times in modern intelligent building
The big power consumer of object is built, and there are also the trend being continuously improved.Under such overall situation, how to save central air conditioner system more
Can, it is more efficient, how reasonably to improve the comprehensive energy efficiency ratio of central air conditioner system, increasingly paid attention to by present user.It is empty
The each end adjusted, although design process is by water force, rationally the methods of piping, accomplishes the hydraulic equilibrium of system as far as possible,
But system hydraulic misadjustment is still common problem, different air conditioning areas often occurs and generates phenomenon uneven in temperature, influences sky
The energy saving stable operation of adjusting system；And most of energy saving producers are all extensive to the control of cooling tower, to make to cool down
The temperature of water is excessively high, and the energy consumption of freezing host is caused to increase；In central air conditioner system, refrigeration system and cooling system are both only
Erection system is also the system of being mutually related, but in other control systems, is all that two systems are isolated to come, independent to control
System, this control method, in the system using temperature as main control parameters, due to the time lag of temperature, so often controlling
The actual conditions of system are lagged behind, so that the requirement of reasonable control system be not achieved, and are in the system mainly controlled with pressure,
Although pressure does not have time lag, pressure can not really reflect the actual use demand of end.Such as Patent No.
A kind of energy-saving management system of central air conditioner of CN201310659168 includes work station, room system control cabinet and end region
Domain control cabinet, terminal region controller are connected to room system control cabinet, room system control by RS485 bus B ACNET agreement
Cabinet processed attaches to work station by network, by the centralized control to air conditioning area end, in real-time collection site and air-conditioning
Portion's data simultaneously timely feedback and give DDC controller, and DDC controller synchronizes variation with the demand of end load to realize end
Optimum management achievees the effect that energy-saving and emission-reduction although air conditioning energy consumption can be reduced to a certain extent, improves the service life of equipment,
But a kind of only method for managing system, energy conservation measure are the variation of simple host-initiated and stopping, not using variable-flow
System, energy saving means are simply inaccurate, and energy-saving effect is unobvious.
Summary, the deficiencies in the prior art are: being all that central air conditioner system is separated to consider now, only pay attention to improving monomer
The power saving rate of equipment, rather than consider the energy conservation and Energy Efficiency Ratio of whole system, it is in this way often that individual device power saving rate is relatively high,
And the power consumption of other equipment especially freezing host is high, this is control mistaken ideas and the short slab of most of energy saving enterprises, existing
Air-conditioning system ignore the equilibrium of supply and demand to end, cooling capacity is not judged in advance according to actual needs, also not to cooling
The precise controlling of tower group causes central air-conditioning to run under higher load for a long time, causes a large amount of energy waste.
Summary of the invention
In order to solve the above problem the present invention provides it is a kind of improve central air conditioner system comprehensive energy efficiency ratio control system,
Central air conditioner system is integrated into an entirety, is control target with whole system, proceeds from the situation as a whole, and leads to water pump, blower, refrigeration
The comprehensive energy efficiency ratio of the equipment such as machine comprehensively consider and whole control, can preferably control central air conditioner system, extend system
In equipment service life, under the premise of not influencing end usage comfort depth excavate central air conditioner system the energy saving space,
Improve central air conditioner system comprehensive energy efficiency ratio.
To achieve the above object, the technical scheme adopted by the invention is as follows: a kind of raising central air conditioner system comprehensive energy efficiency ratio
Control system further include and central control board electricity respectively including central control board and the Centralized Controller that is electrically connected
Property connection chilled water region hydraulic equilibrium and load judge that subsystem, cooling water radiating requirements and load judge subsystem in advance in advance
System, chilled water pump and cooling water pump interactive mode vari- able flow control subsystem, and above three subsystem respectively with Centralized Controller
Be electrically connected, Centralized Controller respectively with freezing host, refrigerating water pump, cooling pump, cooling tower, electric control valve, electric switching valve
It being electrically connected, the display screen of central control board can show the parameter information of three subsystems and the state of a control of Centralized Controller,
And operation central control board can send to Centralized Controller and instruct, to the freezing host, refrigerating water pump, cold in central air conditioner system
But pump, cooling tower, electric control valve, electric switching valve are manually controlled.
Chilled water region hydraulic equilibrium and load judge in subsystem in advance, and flow biography is mounted on each branch pipe of water segregator
Sensor is equipped with temperature sensor, pressure sensor on water segregator general pipeline, and temperature biography is mounted on each branch pipe of water collector
Sensor, pressure sensor are equipped with temperature sensor, pressure sensor and flow sensor, and above-mentioned biography on water collector general pipeline
Sensor is electrically connected with hydraulic equilibrium and the pre- judgment module of load respectively, and hydraulic equilibrium and the pre- judgment module of load are passed by temperature
Sensor acquires the temperature difference and the collected flow number of respective ends flow sensor of each outlet water at tail end temperature and return water temperature
It is analyzed, each end refrigeration duty actually required is obtained by the fuzzy operation in program, when terminal temperature difference is bigger
Illustrate that end load demand is also bigger, Centralized Controller increases after receiving the signal of hydraulic equilibrium and the pre- judgment module of load
The aperture of respective ends electric control valve, and when terminal temperature difference is smaller, illustrates that end demand is also smaller, Centralized Controller receives
Reduce the aperture of corresponding electric control valve after the signal of hydraulic equilibrium and the pre- judgment module of load, chilled water region hydraulic equilibrium and
Load judge in advance subsystem by sensor collection end demand so that motorized adjustment valve opening be adjusted, to refrigeration duty into
Row pre- judgement again, judges that load in advance more rationally, while also more energy efficient, the least favorable point of system installs pressure sensor, connection additional
Into Centralized Controller, when the workload demand very little in region, electric control valve aperture regulation is lesser aperture, when least
When the pressure sensor of benefit point detects that preset value is not achieved in the pressure of the point, which is failure to actuate, and still keeps
Until pressure reaches preset value, beneficial effect is biggish aperture: not only can guarantee good energy-saving effect, simultaneously
Also ensure system end to the entirety needs of pressure.
Carry calculation principle: G=(T1-T2) F*k is actually needed in end
G: load is actually needed in end
T1: end return water temperature
T2: outlet water at tail end temperature
K: specific heat capacity coefficient
F: the flow that end flow sensor measures
Chilled water region hydraulic equilibrium and load judge subsystem on the one hand by adding Static Water in pipe-line system in advance
Dynamic balance valve is adjusted system pipeline characteristic impedance number ratio in debugging at the beginning of water system, makes itself and design requirement pipeline
Characteristic impedance number ratio is consistent, and when system total flow reaches design total flow, the flow of each end-equipment can reach simultaneously to be set
Flow is counted, beneficial effect is: solving system pipeline characteristic impedance number caused by due to design, construction, equipment and materials etc.
Ratio is inconsistent with design requirement pipe characteristic resistance number ratio and makes the actual flow of each user of system and design requirement flow
Inconsistent caused static state hydraulic disorder；On the other hand by adding flow regulator or differential pressure regulator in pipe-line system
Pass through the shielding of dynamic hydraulic equilibrium equipment when other user's valve openings change as dynamic hydraulic equilibrium equipment
Effect, so that the flow of itself is not changed therewith, beneficial effect is: end-equipment flow does not interfere with each other, and realizes dynamic
Hydraulic equilibrium.
Cooling water radiating requirements and load judge in subsystem that the water outlet of cooling water and return water are respectively equipped with a temperature in advance
Sensor, cooling backwater are also equipped with flow sensor, and temperature sensor is equipped on cooling water outfall sewer, and cooling water return water is total
Temperature sensor and flow sensor, and the sensor and cooling water radiating requirements and load pre- judgment module are installed on pipe
Be electrically connected, by cooling water radiating requirements and the pre- judgment module of load to the temperature data of temperature sensor this acquisition with it is upper
The temperature data of one acquisition is compared, to obtain the trend of temperature change, obtains the condensation heat of refrigeration machine, then basis
The condensation heat handled in every group of cooling tower can allow for unit time, cooling water radiating requirements and the pre- judgment module of load are sent
Corresponding cooling tower is opened and blower, beneficial effect are efficiently solved through temperature control to Centralized Controller signal to control
The time lag problem of system.
1, the principle of condensation heat is calculated:
QK=GK*K Δ T
GK: the internal circulating load of cooling water
QK: refrigeration machine condensation heat
Δ T: the temperature difference for going out return water of cooling water
K: specific heat capacity coefficient
2, the principle of the cooling tower group and corresponding blower number opened is calculated:
N=QK/GS
N: the cooling tower group of unlatching and corresponding blower number
GK: the internal circulating load of cooling water
GS: the condensation heat that separate unit cooling tower is capable of handling
In chilled water pump and cooling water pump interactive mode vari- able flow control subsystem, cools back and temperature sensing is installed on water pipe
Device is equipped with temperature sensor on cooling water outlet pipe, freezes and is equipped with temperature sensor on return pipe, freezes and pacifies on outlet pipe
Temperature sensor is filled, and the sensor is electrically connected with freezing and cooling Interactive control and the pre- judgment module of load respectively,
Freezing is electrically connected with cooling Interactive control and the pre- judgment module of load and Centralized Controller, is started in central air conditioner system
When, if freezing the instant measured value of leaving water temperature be greater than freezing water outlet temperature setting value and temperature adjustable deviation and,
Every 30 seconds increase 1HZ of the frequency of chilled water pump, the upper limit of rising frequency program in the cooling interactive rule base of freezing in program
Automatic inquiry, is high frequency region, if above-mentioned condition is invalid, is carried out in next step, if the freezing instant measured value of return water temperature
It is greater than 5 DEG C with the temperature difference of freezing water outlet temperature setting value, then every 30 seconds rising 0.4HZ, the upper limit of rising frequency is advised in interactive mode
It is then inquired automatically in library by program, is high frequency region, if above-mentioned condition is invalid, carried out in next step, when freezing return water temperature
Instant measured value and when freezing the temperature difference of water outlet temperature setting value between 4 DEG C~5 DEG C, if, freezing return water temperature drop value is greater than+
When 0.09, every 30 seconds rising 0.3HZ of frequency, and when freezing return water temperature drop value less than -0.09, every 30 seconds decline 0.5HZ of frequency, such as
Fruit above-mentioned condition is invalid, then carries out in next step, when the freezing instant measured value of return water temperature and freezing water outlet temperature setting value
When the temperature difference is between 3 DEG C~4 DEG C, if, when freezing return water temperature drop value is greater than+0.09, every 30 seconds rising 0.3HZ of frequency, and it is cold
When freezing return water temperature drop value less than -0.09, every 30 seconds decline 0.5HZ of frequency are carried out in next step if above-mentioned condition is invalid,
When freezing the instant measured value of return water temperature and freezing the temperature difference of water outlet temperature setting value less than 3 DEG C, then decline within frequency every 30 seconds
The lower-frequency limit of 0.5HZ, decline can inquire in freezing interactive rule base, be low frequency range；In central air conditioner system starting,
If freeze the instant measured value of leaving water temperature be greater than freezing water outlet temperature setting value and temperature adjustable deviation and, freeze
Every 30 seconds increase 1HZ of the frequency of water pump consider that the temperature of chilled water is because the increase of freezing water can be straight when holding cooling pump
Connecing causes the acting of freezing host to increase, and the water of cooling water is needed also to will increase, so at this time the frequency of cooling water pump is answered
The upper limit of the increase, rising frequency is inquired in interactive rule base by program automatically, be high frequency region, if above-mentioned condition not at
It is vertical, then it carries out in next step, if the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are greater than 4 DEG C,
Then every 30 seconds rising 0.5HZ, the upper limit of rising frequency are inquired in interactive rule base, are time high frequency region, if above-mentioned condition
It is invalid, then it carries out in next step, the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are 3 DEG C~4
When between DEG C, if, when cooling backwater temperature drop value is greater than+0.09, every 30 seconds rising 1HZ of frequency, and cooling backwater temperature drop value is small
When -0.09, every 30 seconds decline 0.7HZ of frequency are carried out if above-mentioned condition is invalid in next step, when cooling water goes out water temperature
When spending instant measured value and the cooling water outlet desired temperature temperature difference between 2 DEG C~3 DEG C, if, cooling backwater temperature drop value be greater than+
When 0.09, every 30 seconds rising 0.7HZ of frequency, and cooling backwater temperature drop value be less than -0.09 when, every 30 seconds decline 0.5HZ of frequency, such as
Fruit above-mentioned condition is invalid, then carries out in next step, when the instant measured value of cooling water leaving water temperature and cooling water outlet desired temperature
When the temperature difference is between 1 DEG C~2 DEG C, if, when cooling backwater temperature drop value is greater than+0.09, every 30 seconds rising 0.5HZ of frequency, and it is cold
But when return water temperature drop value is less than -0.09, every 30 seconds decline 0.5HZ of frequency are carried out in next step if above-mentioned condition is invalid,
When the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are between 0 DEG C~1 DEG C, if, it is cooling
When return water temperature drop value is greater than+0.09, every 30 seconds risings 0.3HZ of frequency, and when cooling backwater temperature drop value is less than -0.09, frequency is every
30 seconds decline 0.3HZ, if above-mentioned condition is invalid, carry out in next step, when the instant measured value of cooling water leaving water temperature with it is cold
But the lower-frequency limit of every 30 seconds decline 0.4HZ of frequency when the water outlet temperature setting value temperature difference is less than 0 DEG C, decline can be cooling interactive
It is inquired in rule base, is low frequency range.
Relational language illustrates table
Following table is freezing and cooling interactive rule base, TQc is surveyedFor cooling water outlet measured value, TCh is surveyedFor freezing return water measurement
Value, TccIt surveysIt is discharged measured value for freezing, the querying method of rule base is exactly to look into table according to corresponding temperature value and the temperature difference
Ask corresponding upper frequency limit and lower limit value.
Remarks: in fmin~fmaxBetween f rise and fall highest frequency variation range be 1Hz/30s.
It is control target with whole system the beneficial effects of the present invention are: central air conditioner system is integrated into an entirety,
It proceeds from the situation as a whole, the comprehensive energy efficiency ratio of the equipment such as water pump, blower, refrigeration host computer is comprehensively considered and entirety controls, it can be more
Central air conditioner system is controlled well, it is the service life of the equipment in extension system, deep under the premise of not influencing end usage comfort
Degree excavates the energy saving space of central air conditioner system, improves central air conditioner system comprehensive energy efficiency ratio.
Detailed description of the invention
Fig. 1 is system principle schematic diagram of the invention,
Fig. 2 is system framework schematic diagram of the invention,
Fig. 3 is that chilled water region hydraulic equilibrium and load of the invention judge subsystem schematic illustration in advance,
Fig. 4 is that cooling water radiating requirements load of the invention judges that subsystem partial schematic is illustrated in advance,
Fig. 5 is the cooling interactive vari- able flow control subsystem part schematic illustration of freezing of the invention,
Fig. 6 is electric control valve control flow chart of the invention,
Fig. 7 is freezing pump frequency control flow chart of the invention,
Fig. 8 is cooling pump frequency control flow chart of the invention.
Specific embodiment
In order to better illustrate the present invention, it is described further now in conjunction with attached drawing.
As shown in Figure 1 and Figure 2, a kind of control system improving central air conditioner system comprehensive energy efficiency ratio, including central control board
It further include the chilled water region hydraulic equilibrium being electrically connected with central control board with the Centralized Controller being electrically connected
And load judges that subsystem, cooling water radiating requirements load judge that subsystem, chilled water pump and cooling water pump interactive mode become in advance in advance
Flow-control subsystem, and above three subsystem respectively with Centralized Controller be electrically connected, Centralized Controller respectively and freezing
Host, refrigerating water pump, cooling pump, cooling tower, electric control valve, electric switching valve are electrically connected, the display screen energy of central control board
Show the parameter information of three subsystems and the state of a control of Centralized Controller, and operating central control board can be to centralized control
Device sends instruction, to the freezing host in central air conditioner system, refrigerating water pump, cooling pump, cooling tower, electric control valve, driven opening
Valve is closed to be manually controlled.
As shown in figure 3, chilled water region hydraulic equilibrium and load judge in subsystem in advance, on the 1-8 branch pipe of water segregator
It is mounted on 1-8 flow sensor, No. 10 temperature sensors, No. 10 pressure sensors are installed on water segregator general pipeline, are catchmented
It is mounted on 1-8 temperature sensor, 1-8 pressure sensor on 8 branch pipes of device, No. 9 temperature are installed on water collector general pipeline
Sensor, No. 9 pressure sensors and No. 9 flow sensors are spent, and the sensor judges with hydraulic equilibrium and load in advance respectively
Module is electrically connected, and hydraulic equilibrium and the pre- judgment module of load and Centralized Controller are electrically connected, and Centralized Controller and freezing are led
Machine and refrigerating water pump are electrically connected hydraulic equilibrium and the pre- judgment module of load and acquire each outlet water at tail end temperature by temperature sensor
It is analyzed with the temperature difference and the collected flow number of respective ends flow sensor of return water temperature, by fuzzy in program
Operation obtains each end refrigeration duty actually required, illustrates that end load demand is also bigger when terminal temperature difference is bigger,
Centralized Controller receives the aperture that respective ends electric control valve is increased after the signal of hydraulic equilibrium and the pre- judgment module of load,
And terminal temperature difference it is smaller when illustrate that end demand is also smaller, Centralized Controller receives hydraulic equilibrium and the pre- judgment module of load
Reduce the aperture of corresponding electric control valve after signal, chilled water region hydraulic equilibrium and load judge that subsystem passes through sensor in advance
End demand is collected to which motorized adjustment valve opening be adjusted, pre- judgement is carried out again to refrigeration duty, judges that load in advance more
Rationally, while also more energy efficient, the least favorable point of system installs pressure sensor additional, is connected in Centralized Controller, when in region
Electric control valve aperture regulation is lesser aperture when workload demand very little, when the pressure sensor of least favorable point detects the point
Pressure when preset value is not achieved, which is failure to actuate, and biggish aperture is still kept to reach preparatory until pressure
Until setting value, chilled water region hydraulic equilibrium and load judge subsystem not only in advance and can guarantee good energy-saving effect, simultaneously
Also ensure system end to the entirety needs of pressure.
Carry calculation principle: G=(T1-T2) F*K is actually needed in end
G: load is actually needed in end
T1: temperature sensor measures the return water temperature of branch pipe
T2: temperature sensor measures the leaving water temperature of water segregator
F: flow sensor measures flow
K: specific heat capacity coefficient
Chilled water region hydraulic equilibrium and load judge subsystem on the one hand by adding Static Water in pipe-line system in advance
Dynamic balance valve is adjusted system pipeline characteristic impedance number ratio in debugging at the beginning of water system, makes itself and design requirement pipeline
Characteristic impedance number ratio is consistent, and when system total flow reaches design total flow, the flow of each end-equipment can reach simultaneously to be set
Flow is counted, system pipeline characteristic impedance number ratio and design caused by due to design, construction, equipment and materials etc. is solved and wants
It asks pipe characteristic resistance number ratio inconsistent and keeps the actual flow of each user of system and design requirement flow inconsistent caused
Static state hydraulic disorder；On the other hand by adding flow regulator or differential pressure regulator in pipe-line system as dynamic waterpower
Balancing equipment, by the shielding action of dynamic hydraulic equilibrium equipment, makes itself when other user's valve openings change
Flow does not change therewith, and end-equipment flow does not interfere with each other, and realizes dynamic hydraulic equilibrium.
As shown in figure 4, cooling water radiating requirements load judges in subsystem in advance, temperature is installed on cooling water outfall sewer
Sensor T11, is equipped with temperature sensor T12 and flow sensor F10 on cooling water return main, and the sensor with it is cold
But water-cooled demand and the pre- judgment module electric connection of load, cooling water radiating requirements and the pre- judgment module of load and centralized control
Device is electrically connected, by cooling water radiating requirements and the pre- judgment module of load to the temperature data of temperature sensor this acquisition with
The last time temperature data of acquisition is compared, to obtain the trend of temperature change, obtains the condensation heat of refrigeration machine, then root
According to the condensation heat handled in every group of cooling tower can allow for unit time, cooling water radiating requirements and the pre- judgment module hair of load
Centralized Controller signal is given to control and open corresponding cooling tower and blower, thus efficiently solve by it is temperature controlled when
Stickiness problem.
1, the principle of condensation heat is calculated:
QK=GK*K Δ T
GK: the internal circulating load of cooling water
QK: refrigeration machine condensation heat
Δ T: the temperature difference for going out return water of cooling water
K: specific heat capacity coefficient
2, the principle of the cooling tower group and corresponding blower number opened is calculated:
N=QK/GS
N: the cooling tower group of unlatching and corresponding blower number
GK: the internal circulating load of cooling water
GS: the condensation heat that separate unit cooling tower is capable of handling
As shown in figure 5, pacifying on cooling back water pipe in chilled water pump and cooling water pump interactive mode vari- able flow control subsystem
Temperature sensor T13, the mounting temperature sensor T14 on cooling water outlet pipe are filled, temperature sensing is installed on freezing return pipe
Device T15, the mounting temperature sensor T16 on freezing outlet pipe, and the sensor respectively with freezing and cooling Interactive control
And the pre- judgment module of load is electrically connected, freezing and cooling Interactive control and the pre- judgment module of load and Centralized Controller are electrical
Connection, central air conditioner system starting when, if freezing the instant measured value of leaving water temperature be greater than freezing water outlet temperature setting value with
The sum of the adjustable deviation of temperature, then every 30 seconds increase 1HZ of the frequency of chilled water pump, the upper limit of rising frequency are regular in interactive mode
It is inquired automatically in library by program, is high frequency region, if above-mentioned condition is invalid, carried out in next step, if freezing return water temperature
The temperature difference of instant measured value and freezing water outlet temperature setting value is greater than 5 DEG C, then every 30 seconds rising 0.4HZ, the upper limit of rising frequency
It is inquired automatically in interactive rule base by program, is high frequency region, if above-mentioned condition is invalid, carried out in next step, when cold
When freezing the instant measured value of return water temperature and freezing the temperature difference of water outlet temperature setting value between 4 DEG C~5 DEG C, if freezing return water
Temperature drop value be greater than+0.09 when, every 30 seconds risings 0.3HZ of frequency, and freeze return water temperature drop value be less than -0.09 when, frequency every 30 seconds
Decline 0.5HZ, if above-mentioned condition is invalid, carries out in next step, when the freezing instant measured value of return water temperature and freezing are discharged
When the temperature difference of desired temperature is between 3 DEG C~4 DEG C, if, when freezing return water temperature drop value is greater than+0.09, on frequency every 30 seconds
When rising 0.3HZ, and freezing return water temperature drop value less than -0.09, every 30 seconds decline 0.5HZ of frequency, if above-mentioned condition is invalid,
It carries out in next step, when freezing the instant measured value of return water temperature and freezing the temperature difference of water outlet temperature setting value less than 3 DEG C, then frequency
The lower-frequency limit of every 30 seconds decline 0.5HZ, decline can inquire in freezing interactive rule base, be low frequency range；In central air-conditioning
When system starts, if the freezing instant measured value of leaving water temperature is greater than the adjustable deviation of freezing water outlet temperature setting value and temperature
Sum, then every 30 seconds increase 1HZ of the frequency of chilled water pump consider that the temperature of chilled water is because of freezing water when opening cooling pump
Increase can directly result in freezing host acting increase, need the water of cooling water also to will increase, so at this time cooling water
The frequency of pump should increase, and the upper limit of rising frequency is inquired in interactive rule base by program automatically, be high frequency region, if on
It is invalid to state condition, then carries out in next step, if the instant measured value of cooling water leaving water temperature and cooling water outlet desired temperature temperature
Difference is greater than 4 DEG C, then every 30 seconds rising 0.5HZ, the upper limit of rising frequency are inquired in interactive rule base, is time high frequency region, such as
Fruit above-mentioned condition is invalid, then carries out in next step, the instant measured value of cooling water leaving water temperature and cooling water outlet desired temperature temperature
When difference is between 3 DEG C~4 DEG C, if, when cooling backwater temperature drop value is greater than+0.09, every 30 seconds rising 1HZ of frequency, and cool back
When water temperature depreciation is less than -0.09, every 30 seconds decline 0.7HZ of frequency are carried out if above-mentioned condition is invalid in next step, when cold
But when the instant measured value of water leaving water temperature and the cooling water outlet desired temperature temperature difference are between 2 DEG C~3 DEG C, if, cooling backwater
When temperature drop value is greater than+0.09, every 30 seconds risings 0.7HZ of frequency, and when cooling backwater temperature drop value is less than -0.09, frequency every 30 seconds
Decline 0.5HZ, if above-mentioned condition is invalid, carries out in next step, when the instant measured value of cooling water leaving water temperature and cooling go out
When the coolant-temperature gage setting value temperature difference is between 1 DEG C~2 DEG C, if, when cooling backwater temperature drop value is greater than+0.09, on frequency every 30 seconds
Rise 0.5HZ, and cooling backwater temperature drop value be less than -0.09 when, every 30 seconds decline 0.5HZ of frequency, if above-mentioned condition is invalid,
It carries out in next step, when the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are between 0 DEG C~1 DEG C
When, if, cooling backwater temperature drop value be greater than+0.09 when, every 30 seconds risings 0.3HZ of frequency, and cooling backwater temperature drop value less than-
When 0.09, every 30 seconds decline 0.3HZ of frequency are carried out if above-mentioned condition is invalid in next step, when cooling water leaving water temperature is
When measured value and the cooling water outlet desired temperature temperature difference less than 0 DEG C when every 30 seconds decline 0.4HZ of frequency, the lower-frequency limit of decline can
It is inquired in cooling interactive rule base, is low frequency range.
Following table is freezing and cooling interactive rule base, TQc is surveyedFor cooling water outlet measured value, TCh is surveyedFor freezing return water measurement
Value, TccIt surveysIt is discharged measured value for freezing, the querying method of rule base is exactly to look into table according to corresponding temperature value and the temperature difference
Ask corresponding upper frequency limit and lower limit value
Remarks: in fmin~fmaxBetween f rise and fall highest frequency variation range be 1Hz/30s.
Claims (1)
1. a kind of control system for improving central air conditioner system comprehensive energy efficiency ratio, including Centralized Controller and is electrically connected
Freezing host, refrigerating water pump, cooling pump, cooling tower, electric control valve characterized by comprising
Central control board, Centralized Controller and central control board are electrically connected, and further include being electrically connected with central control board
Chilled water region hydraulic equilibrium and load judge in advance subsystem, cooling water radiating requirements and load judge in advance subsystem, freezing
Water pump and cooling water pump interactive mode vari- able flow control subsystem, and above three subsystem electrically connects with Centralized Controller respectively
It connects, Centralized Controller electrically connects with freezing host, refrigerating water pump, cooling pump, cooling tower, electric control valve, electric switching valve respectively
It connects；
The chilled water region hydraulic equilibrium and load judge in subsystem in advance, are mounted on flow on each branch pipe of water segregator
Sensor is equipped with temperature sensor, pressure sensor on water segregator general pipeline, is mounted on temperature on each branch pipe of water collector
Sensor, pressure sensor are equipped with temperature sensor, pressure sensor and flow sensor, and book on water collector general pipeline
Sensor in system is electrically connected with hydraulic equilibrium and the pre- judgment module of load respectively, is provided with static waterpower in pipe-line system
Balanced valve is adjusted system pipeline characteristic impedance number ratio in debugging at the beginning of water system, keeps it special with design requirement pipeline
Property resistance number ratio is consistent, is additionally provided with flow regulator or differential pressure regulator as dynamic hydraulic equilibrium equipment, and system
Least favorable point is equipped with the pressure sensor being electrically connected with Centralized Controller, the motorized adjustment when the workload demand in region is small
Valve opening is adjusted to-small aperture, when the pressure sensor of least favorable point detects that preset value is not achieved in the pressure of the point
When, which is failure to actuate, and still keeps big aperture until pressure reaches preset value, and end actual needs is negative
Lotus Computing Principle: G=(T1-T2) F*k
G: load is actually needed in end
T1: end return water temperature
T2: outlet water at tail end temperature
K: specific heat capacity coefficient
F: the flow that end flow sensor measures, the specific location of electric control valve are branch pipe each time that water collector is arranged in
On the road；
The cooling water radiating requirements and load judge in subsystem that the water outlet of cooling water and return water are respectively equipped with a temperature in advance
Sensor is spent, cooling backwater is also equipped with flow sensor, temperature sensor, cooling water return water are equipped on cooling water outfall sewer
Temperature sensor and flow sensor are installed, and the sensor in this subsystem and cooling water radiating requirements and load on general pipeline
Pre- judgment module is electrically connected, and passes through cooling water radiating requirements and the pre- judgment module of the load temperature that this is acquired to temperature sensor
Degree is compared according to the temperature data of last time acquisition, to obtain the trend of temperature change, obtains the condensation of refrigeration machine
Heat, then according to the condensation heat handled in every group of cooling tower can allow for unit time, cooling water radiating requirements and load are pre-
Judgment module is sent to Centralized Controller signal to control and open corresponding cooling tower and blower, calculates the principle of condensation heat:
QK=GK*K Δ T
GK: the internal circulating load of cooling water
QK: refrigeration machine condensation heat
Δ T: the temperature difference for going out return water of cooling water
K: specific heat capacity coefficient
Calculate the principle of the cooling tower group and corresponding blower number opened
N=QK/GS
N: the cooling tower group of unlatching and corresponding blower number
GK: the internal circulating load of cooling water
GS: the condensation heat that separate unit cooling tower is capable of handling；
In the chilled water pump and cooling water pump interactive mode vari- able flow control subsystem, in freezing host side, water pipe is cooled back
On temperature sensor is installed, temperature sensor is installed on cooling water outlet pipe, freezes and temperature sensing is installed on return pipe
Device, freezes mounting temperature sensor on outlet pipe, and the sensor in this subsystem respectively with freezing and cooling Interactive control
And the pre- judgment module of load is electrically connected, freezing and cooling Interactive control and the pre- judgment module of load and Centralized Controller are electrical
Connection, central air conditioner system starting when, if freezing the instant measured value of leaving water temperature be greater than freezing water outlet temperature setting value with
The sum of the adjustable deviation of temperature, then every 30 seconds increase 1HZ of the frequency of chilled water pump, the upper limit of rising frequency are handed in freezing cooling
Program is inquired automatically in mutual formula rule base, if above-mentioned condition is invalid, is carried out in next step, if freezing return water temperature is instant
The temperature difference of measured value and freezing water outlet temperature setting value is greater than 5 DEG C, then every 30 seconds rising 0.4HZ of the frequency of chilled water pump, rise
The upper limit of frequency is inquired in interactive rule base by program automatically, if above-mentioned condition is invalid, is carried out in next step, when cold
When freezing the instant measured value of return water temperature and freezing the temperature difference of water outlet temperature setting value between 4 DEG C~5 DEG C, and if freezed back
A measured value before a measured value-freezing return water temperature after water temperature depreciation=freezing return water temperature, freezing return water temperature drop value are big
When+0.09 degree Celsius, every 30 seconds rising 0.3HZ of the frequency of chilled water pump, and return water temperature drop value is freezed less than -0.09 degree Celsius
When, every 30 seconds decline 0.5HZ of the frequency of chilled water pump are carried out in next step, if above-mentioned condition is invalid when freezing return water temperature
When spending instant measured value and freezing the temperature difference of water outlet temperature setting value between 3 DEG C~4 DEG C, and if freezing return water temperature drop value
When greater than+0.09 degree Celsius, every 30 seconds rising 0.3HZ of the frequency of chilled water pump, and it is Celsius less than -0.09 to freeze return water temperature drop value
When spending, every 30 seconds decline 0.5HZ of the frequency of chilled water pump are carried out in next step, if above-mentioned condition is invalid when freezing return water
When the temperature difference of the instant measured value of temperature and freezing water outlet temperature setting value is less than 3 DEG C, then decline within the frequency of chilled water pump every 30 seconds
The lower-frequency limit of 0.5HZ, decline can inquire in freezing interactive rule base；In central air conditioner system starting, if freezing
The instant measured value of leaving water temperature be greater than the adjustable deviation of freezing water outlet temperature setting value and temperature and, then the frequency of chilled water pump
Every 30 seconds increase 1HZ of rate, the upper limit of rising frequency are inquired in interactive rule base by program automatically, if above-mentioned condition not at
It is vertical, then it carries out in next step, if the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are greater than 4 DEG C,
Then every 30 seconds rising 0.5HZ of the frequency of chilled water pump, the upper limit of rising frequency is inquired in interactive rule base, if above-mentioned item
Part is invalid, then carries out in next step, the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference 3 DEG C~
When between 4 DEG C, if, when cooling backwater temperature drop value is greater than+0.09 degree Celsius, every 30 seconds rising 1HZ of the frequency of chilled water pump, and
When cooling backwater temperature drop value is less than -0.09 degree Celsius, every 30 seconds decline 0.7HZ of the frequency of chilled water pump, if above-mentioned condition is not
It sets up, then carries out in next step, when the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are 2 DEG C~3
When between DEG C, if, when cooling backwater temperature drop value is greater than+0.09 degree Celsius, every 30 seconds rising 0.7HZ of the frequency of chilled water pump,
And cooling backwater temperature drop value be less than -0.09 degree Celsius when, every 30 seconds decline 0.5HZ of the frequency of chilled water pump, if above-mentioned condition
It is invalid, then carry out in next step, when the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference 1 DEG C~
When between 2 DEG C, if, when cooling backwater temperature drop value is greater than+0.09 degree Celsius, every 30 seconds rising 0.5HZ of frequency, and cooling backwater
When temperature drop value is less than -0.09 degree Celsius, every 30 seconds decline 0.5HZ of frequency are carried out in next step if above-mentioned condition is invalid,
When the instant measured value of cooling water leaving water temperature and the cooling water outlet desired temperature temperature difference are between 0 DEG C~1 DEG C, if, it is cooling
When return water temperature drop value is greater than+0.09, every 30 seconds risings 0.3HZ of frequency, and when cooling backwater temperature drop value is less than -0.09 degree Celsius,
Every 30 seconds decline 0.3HZ of frequency are carried out if above-mentioned condition is invalid in next step, when cooling water leaving water temperature measures immediately
Every 30 seconds decline 0.4HZ of frequency when value and the cooling water outlet desired temperature temperature difference are less than 0 DEG C, the lower-frequency limit of decline can be in cooling
It is inquired in interactive rule base, relational language illustrates table:
Following table is freezing and cooling interactive rule base, Tqc survey be cooling water outlet measured value, Tch survey be freeze return water measured value,
Tcc, which surveys, is discharged measured value for freezing, and the querying method of rule base is exactly to be inquired in table according to corresponding temperature value and the temperature difference
Corresponding upper frequency limit and lower limit value:
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| CN107401806B (en) * | 2017-06-22 | 2020-01-21 | 广州地铁集团有限公司 | Method for improving and controlling comprehensive energy efficiency of main engine and refrigerating pump in central air-conditioning refrigerating station |
| CN107576028A (en) * | 2017-09-19 | 2018-01-12 | 上海大众祥源动力供应有限公司 | A kind of flow control system and method for handpiece Water Chilling Units cooling water pump |
| CN108224632A (en) * | 2017-12-27 | 2018-06-29 | 广东中新节能环保有限公司 | Hotel Buildings central air conditioner room chilled water system comprehensive energy efficiency lifting control method |
| CN111200919B (en) * | 2018-11-19 | 2022-04-01 | 中国移动通信集团内蒙古有限公司 | Cold source BA control system and data center |
| CN109917656B (en) * | 2019-03-29 | 2022-03-01 | 重庆大学 | Circulating cooling water minimum pressure difference energy-saving control system and method based on process medium multi-temperature target |
| CN111412584B (en) * | 2020-04-03 | 2021-05-14 | 西安建筑科技大学 | Group intelligent optimization method for dynamic hydraulic balance of chilled water pipe network of central air conditioner |
| CN115682572A (en) * | 2022-11-07 | 2023-02-03 | 珠海格力电器股份有限公司 | Chilled water unit load determining and loading and unloading control method, device and equipment |
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| CN203869259U (en) * | 2014-05-30 | 2014-10-08 | 厦门立思科技股份有限公司 | Variable pressure difference control device based on openness of chilled water valve of tail-end air conditioning equipment |
| CN204285723U (en) * | 2014-09-21 | 2015-04-22 | 胡忠梁 | A kind of central air-conditioning multizone cooling cold balancing control appliance |
| CN204806608U (en) * | 2015-05-22 | 2015-11-25 | 青岛华新博源智能科技有限公司 | Water -cooled central air conditioning control system |
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