CN108562016A - A kind of total air volume control method and device of more end integrated air exhausts - Google Patents
A kind of total air volume control method and device of more end integrated air exhausts Download PDFInfo
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- CN108562016A CN108562016A CN201810298710.5A CN201810298710A CN108562016A CN 108562016 A CN108562016 A CN 108562016A CN 201810298710 A CN201810298710 A CN 201810298710A CN 108562016 A CN108562016 A CN 108562016A
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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
- F24F11/0001—Control or safety arrangements for ventilation
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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
- F24F11/63—Electronic processing
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A kind of simple total air volume control method of more end integrated air exhausts, in the integrated air exhaust system of more ends, more ends are monitored to obtain operation required airflow, it calculates least favorable degree of hydraulic misadjustment to be modified to obtain running exhaust air rate operation required airflow, controls fan operation accordingly.The invention also discloses a kind of control devices of more end integrated air exhausts, including one or more frequency conversion fans (1), a degree of hydraulic misadjustment calculator (2), the monitoring system of end more than one (3)；One or more of frequency conversion fans are connected in parallel, and the degree of hydraulic misadjustment calculator (2) is connected with more end monitoring systems (3)；The present invention can be used for solving in more end integrated air exhaust systems, variable air volume running adjusting control problem.The defects of the present invention overcomes constant static-pressure in the prior art, Static pressure reset control method system complexity, high energy consumptions.
Description
Technical field
The invention belongs to Ventilation Control technical fields, are related to total air volume control method, concentrate and arrange in particular for more ends
The total air volume control method and device of wind system.
Background technology
Traditional ventilating system total air volume control method is constant static-pressure method and change static pressure method.The control of constant static-pressure method is simple, but
Fan energy consumption is higher, and serious noise problem is accordingly brought in each bottom valve position many places in state less than normal；It is multiple to become static pressure method algorithm
Miscellaneous, realization is more difficult, and the product that Heat ＆ Control Pty Ltd. provides generally is not providing the control algolithm for becoming static pressure, it is necessary to control people
Member's field programming, debugging, heavy workload.
Invention content
The purpose of the present invention is to provide a kind of easy total air volume control method and devices, can be directed to the concentration of more ends
Exhaust system, the defects of overcoming complicated aforementioned constant static-pressure in the prior art, Static pressure reset control method system, high energy consumption.
In order to achieve the above objectives, it the technical solution adopted by the present invention and has the beneficial effect that：
A kind of total air volume control method of more end integrated air exhausts, in the integrated air exhaust system of more ends, to more ends
It is monitored to obtain operation required airflow, calculates least favorable degree of hydraulic misadjustment and operation required airflow is modified to obtain system
Actual motion exhaust air rate, controls fan operation accordingly.
Further, the method includes：Least favorable imbalance degree according to more ends monitor system-computed unlatching rate by from
Line method solves, and precalculates hydraulic regime of the air draft pipe network system under different operation unlatching rates, forms a least favorable
The single-valued relationship of degree of hydraulic misadjustment and operation unlatching rate；In addition, according to the Performance Match of wind turbine, air quantity and wind turbine can be obtained
Gained least favorable degree of hydraulic misadjustment is modified ideal operation air quantity by the correspondence of rotating speed, further according to fan delivery and
The correspondence of rotating speed finds out fan operation frequency.
Total exhaust air rate unlatching rate calculated is multiplied by each tip designs exhaust air rate and obtains；Again by least favorable degree of imbalance
Exhaust air rate is modified, running exhaust air rate can be obtained；The operation of wind turbine is finally calculated according to this exhaust air rate
Frequency controls fan frequency conversion operation accordingly.
The design air flow of more each ends of end integrated air exhaust system is consistent, and each end has the operation opened and closed at random to need
It asks；In system operation, if having monitored, end occurs to open and close variation, and operation unlatching rate is calculated according to following formula：
Least favorable degree of hydraulic misadjustment is further calculated out according to calculated unlatching rate result.
If unlatching rate is unchanged, wind turbine maintains former rotating speed operation, if unlatching rate changes, wind turbine needs correspondingly frequency conversion
Operation；In air pipeline system, if system waterpower stability is equal to 1, system total impedance is constant, by advance water force
It is matched with fan performance, proportional relationship between total blast volume and rotation speed of fan that system needs：
The relational expression of operating status and design point is：
According to the relational expression of rotating speed and frequency：
Calculate running frequency f of the wind turbine under corresponding operating modeOperation；
Wherein, G1Indicate the systematic air flow before frequency conversion；G2Indicate the systematic air flow after frequency conversion；N1Indicate the wind turbine before frequency conversion
Rotating speed；N2Indicate the rotation speed of fan after frequency conversion；
GDesignIndicate the systematic air flow under design conditions；GOperationIndicate the systematic air flow under operating condition；NDesignIndicate design work
Rotation speed of fan under condition；NOperationIndicate the rotation speed of fan under operating condition；fOperationIndicate the wind turbine frequency under operating condition；P is indicated
Power of fan.
If more end system waterpower stabilitys are not 1, and also cover many open positions under each unlatching rate
Combined information has many operating modes under an i.e. unlatching rate；Under each operating mode, if there is different degree of hydraulic misadjustment x=in each end
The flow that actual motion flow/design needs；Least favorable degree of hydraulic misadjustment under each unlatching rate is calculated, this is most
Unfavorable degree of hydraulic misadjustment is the safety allowance coefficient 1/x under corresponding unlatching rate.
Under a certain unlatching rate, network hydraulic operation state is analyzed, system drag overall when terminal position is all gathered in distal end
It is the largest, under same wind turbine frequency, the sum of the operation total blast volume of system is minimum under the operating mode；With each end under the scene
The degree of hydraulic misadjustment minimum value x at endminAs a result as the safety allowance calculation basis under corresponding unlatching rate, and then by fan operation
Rotating speed is modified toFrequency is modified toThe operating mode that terminal position is all further gathered in proximal end, is scattered in both ends
Under xminAs a result it also precalculates out, then in the x of three operating modesminAs a result it is minimized in, most as fan frequency conversion
Whole foundation；Wherein, NOperationIndicate the rotation speed of fan under operating condition；fOperationIndicate the wind turbine frequency under operating condition.
Realize the control device of more end integrated air exhausts of the total air volume control method of above-mentioned more end integrated air exhausts, at least
System is monitored including a frequency conversion fan, a degree of hydraulic misadjustment calculator, end more than one, the running frequency of wind turbine is according to more
The least favorable hydraulic misadjustment angle value that end monitors the operation required airflow of system feedback and degree of hydraulic misadjustment calculator provides is come true
It is fixed.
Further, including one or more frequency conversion fans, least favorable degree of hydraulic misadjustment calculator, more ends monitoring system,
Multiple exhaust system branch pipes, end open and close valve, exhaust system supervisor；The frequency conversion fan is connected with exhaust system supervisor to provide
Air draft needed for system, exhaust system supervisor are equipped with several exhaust system branch pipes, and each exhaust system branch pipe is opened equipped with end
Valve closing, more end monitoring systems open and close valve with the end being arranged on each exhaust system branch pipe and are connected, to obtain monitoring signals, most
Unfavorable degree of hydraulic misadjustment calculator is connect with more ends monitoring system to obtain the unlatching rate of system, to reponse system wind turbine institute
Running frequency, least favorable degree of hydraulic misadjustment calculator is needed to be connected with frequency conversion fan to transmit current desired running frequency, to
Reach system total air volume control.
The wind turbine is driven by direct current or alternating current generator；The degree of hydraulic misadjustment calculator is for completing the mistake of least favorable waterpower
The calculating of scheduling and fan operation frequency.
More end monitoring systems transmit information using wired communication mode, are turned on and off by each end of monitoring
Situation, to calculate total unlatching rate；
Preferably, the connection of more end monitoring systems is packed into casing, inner wall, outer wall along exhaust system air hose
Installation is fixed.
In the integrated air exhaust system of more ends, wind turbine can be direct current or alternating current generator driving, be supervised by more ends
Examining system feedback obtains operation required airflow, and is carried out to it by the least favorable hydraulic misadjustment angle value that degree of hydraulic misadjustment calculator provides
It corrects.Advantage is that the simple total air volume control method that the invention proposes has the characteristic of no air quantity monitoring, control letter
Just, stablize, is reliable.
In some embodiments, more end monitoring systems therein are transmitted by wire communication mode, by monitoring each end
The case where end is turned on and off, calculates total unlatching rate；When more ends monitor the unlatching of each end of system monitoring, close situation,
The corresponding location information in each end need not be monitored；Its connection can be packed into casing, and installation is fixed along the inside and outside wall of air hose.
Advantage is that signal transmission is quick, stablizes, is reliable, it is ensured that the quick response of system.
In the simple total air volume control method of the integrated air exhaust system of more ends, degree of hydraulic misadjustment calculator therein can be right
Least favorable degree of hydraulic misadjustment and wind turbine operating frequency are calculated, and computational methods are as follows：The air draft pipe network system is precalculated to exist
Hydraulic regime under different unlatching rates forms the single-valued relationship of least favorable degree of hydraulic misadjustment x and unlatching rate, i.e., one unlatching
Rate corresponds to a least favorable degree of hydraulic misadjustment, using this least favorable degree of hydraulic misadjustment x as fan operation frequency fOperationAmendment system
Number；As shown in formula (1), (2) and formula (3).
Wherein, x indicates the least favorable imbalance degree under certain operating mode；GDesignIndicate the systematic air flow under design conditions；GOperationIt indicates
Systematic air flow under operating condition；NDesignIndicate the rotation speed of fan under design conditions；NOperationIndicate the rotation speed of fan under operating condition；
fOperationIndicate the wind turbine frequency under operating condition；fOperation is correctedIt indicates to utilize the revised wind turbine actual motion frequency of least favorable imbalance degree
Rate；P indicates power of fan, related with fan parameter.
Least favorable degree of hydraulic misadjustment is precalculated, needs to calculate the system least favorable imbalance under each degree of hydraulic misadjustment
Degree, i.e., unlatching rate is required to calculate from 0-1.Since each unlatching rate corresponds to a variety of open positions, workload is heavy, therefore this
Invention proposes, under each unlatching rate, only calculates open position and is located at remote fan end, the minimum degree of hydraulic misadjustment of the operating mode is
Least favorable degree of hydraulic misadjustment under the unlatching rate.
Advantage is to precalculate to obtain corresponding least favorable degree of hydraulic misadjustment and operating frequency under each unlatching rate,
Hydraulic pipeline complicated in actual motion is can avoid to calculate.
In the simple total air volume control method of the integrated air exhaust system of more ends, wherein total exhaust air rate monitors system by more ends
The unlatching rate that statistics is calculated is multiplied by each tip designs exhaust air rate and obtains；Exhaust air rate is modified by least favorable imbalance degree again, can be obtained
To running exhaust air rate；The running frequency of wind turbine is finally calculated according to this exhaust air rate, to make fan frequency conversion transport
Row.Advantage is to give up traditional constant static-pressure, become static pressure complex control mode, forms unlatching rate → least favorable waterpower and loses
The simple monotropic function control logic of scheduling → amendment air quantity → rotation speed of fan → wind turbine operating frequency, can quick response system
Simple variable air rate demand.
The computational methods of the least favorable imbalance degree are as follows：The air draft pipe network system is precalculated in different operation unlatching rates
Under hydraulic regime, form easy least favorable imbalance degree and run the single-valued relationship of unlatching rate, i.e., as waterpower
Offline simple, the reliable calculation basis of imbalance degree, constitutes the core of simple total air volume control method and technology；It is supervised further according to more ends
The unlatching rate that examining system calculates, substitution can be obtained running frequency needed for wind turbine, be a kind of offline computing methods.
The computational methods of the fan operation frequency are as follows：The air draft pipe network system is equally precalculated under design conditions
Air quantity and running frequency the correspondence of air quantity and rotation speed of fan can be obtained according to the Performance Match of wind turbine；Then by upper one
The least favorable degree of hydraulic misadjustment of step gained is modified ideal air quantity；Finally according to the correspondence of fan delivery and rotating speed,
Calculating finds out fan operation frequency.
Description of the drawings
Fig. 1 is each equipment connection diagram of simple total air volume control system in the embodiment of the present invention.
Reference numeral：Frequency conversion fan 1, least favorable degree of hydraulic misadjustment calculator 2, more ends monitoring system 3, exhaust system branch
Pipe 4, end open and close valve 5, exhaust system supervisor 6.
Specific implementation mode
The present invention is described in further detail for illustrated embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of simple total air volume control method of more end integrated air exhaust systems provided by the invention, each
The connection signal of relevant device, including one or more frequency conversion fans 1, least favorable degree of hydraulic misadjustment calculator 2, the monitoring of more ends
System 3, multiple exhaust system branch pipes 4, end open and close valve 5, exhaust system supervisor 6.
The least favorable degree of hydraulic misadjustment calculator needs, by testing in advance, to obtain the water under system difference unlatching rate first
Power imbalance degree, such as the present embodiment correspondence system, is calculated as shown in the table to obtain minimum i.e. least favorable degree of hydraulic misadjustment
Corresponding result：
Table 1-2 least favorable degree of hydraulic misadjustment result of calculations
It programs above-mentioned unlatching rate and least favorable imbalance degree to form computing module, is when degree of hydraulic misadjustment calculator receives
After the unlatching rate of system instantly, formula (2), (3), (4), in conjunction with the least favorable degree of hydraulic misadjustment result of calculation being previously implanted
xmin, you can obtain the fan operation frequency under corresponding unlatching rate.
The more ends monitoring system is led by the transmission of sensor, connection sensor and control system positioned at each end
The three parts such as line, control system form, and circuit and mechanical structure are obvious.
Frequency conversion fan 1 is connected with exhaust system supervisor 6 to provide air draft needed for system, if exhaust system supervisor 6 is equipped with
Dry exhaust system branch pipe 4, each exhaust system branch pipe 4 are equipped with end and open and close valve 5, more end monitoring systems 3 and each air draft system
The end being arranged on system branch pipe 4 opens and closes valve 5 and is connected, to obtain monitoring signals, least favorable degree of hydraulic misadjustment calculator 2 and mostly end
Monitoring system 3 is held to connect to obtain the unlatching rate of system, to running frequency, least favorable hydraulic misadjustment needed for reponse system wind turbine
Degree calculator 2 is connected with frequency conversion fan 1 to transmit current desired running frequency, to reach system total air volume control.
More end integrated air exhaust systems of the present embodiment meaning can be more end exhaust systems of arbitrary occasion, each end
Design air flow it is consistent, and there is the operation demand opened and closed at random in each end.For example, curing department's multiple devices exhaust gas centralized collection
System, welding shop multistation central exhaust system, the multiple rows of wind cabinet in laboratory integrated air exhaust system etc..In system operation
In, can be monitoring end valve, equipment etc. by more ends monitoring system monitoring statistics if there is end to occur to open and close variation
Keying signal, after obtaining monitoring signals, calculates operation unlatching rate, and unlatching rate result, which is transferred to degree of hydraulic misadjustment, to be calculated
The computational methods of device, unlatching rate are as follows：
If unlatching rate is unchanged, wind turbine maintains former rotating speed operation, if unlatching rate changes, wind turbine needs corresponding frequency conversion
Operation.In air pipeline system, it is assumed that system waterpower stability is equal to 1, then system total impedance is constant, by advance potamometer
It calculates and fan performance matches, proportional relationship between total blast volume and rotation speed of fan that system needs：
Wherein, G1Indicate the systematic air flow before frequency conversion；G2Indicate the systematic air flow after frequency conversion；N1Indicate the wind turbine before frequency conversion
Rotating speed；N2Indicate the rotation speed of fan after frequency conversion.
The relational expression that operating status and design point then can be obtained is：
Further according to the relational expression of rotating speed and frequency：
Running frequency f of the wind turbine under corresponding operating mode can be obtainedOperation。
Wherein, x indicates the least favorable imbalance degree under certain operating mode；GDesignIndicate the systematic air flow under design conditions；GOperationIt indicates
Systematic air flow under operating condition；NDesignIndicate the rotation speed of fan under design conditions；NOperationIndicate the rotation speed of fan under operating condition；
fOperationIndicate the wind turbine frequency under operating condition；fOperation is correctedIt indicates to utilize the revised wind turbine actual motion frequency of least favorable imbalance degree
Rate；P indicates power of fan, related with fan parameter.
In this way, the operation unlatching rate acquired by more ends monitoring system, you can determine the total blast volume and wind turbine at current time
Running frequency；But more end system waterpower stabilitys can not possibly be 1, and also cover much to open under each unlatching rate
The combined information of position is opened, is i.e. there are many operating modes under a unlatching rate, under each operating mode, there is different hydraulic misadjustments in each end
Spend x (flow that actual motion flow/design needs).The least favorable degree of hydraulic misadjustment under each unlatching rate, (i.e. waterpower is lost
Dispatch value minimum value) it calculates, this least favorable degree of hydraulic misadjustment is the safety allowance coefficient 1/x under corresponding unlatching rate.
It is analyzed according to hydraulic regime, (is exactly briefly, that certain ends keying valves are in opening state under a certain unlatching rate
Under state, the ratio of the quantity of unlatching and all end quantity), three kinds of limit scenes of terminal position are considered, first, the end opened
End is all gathered in nearly fan end, second is that the end opened all is gathered in remote fan end, third, the end opened is scattered in far
Two close end.With regard to network hydraulic operation state analyze, when being all gathered in distal end system drag overall be the largest, in same wind turbine frequency
Under, the operation total blast volume of system is minimum under the operating mode, that is, the practical operation by each end discharge opened is total
Air quantity is minimum.Therefore, the present invention is proposed with the degree of hydraulic misadjustment minimum value x of each end under the sceneminAs a result as correspondence
Safety allowance calculation basis under unlatching rate, and then fan operation rotating speed is modified toFrequency is modified toTake into account one
Step ensures the reliability of simple total air control preparation method, the x for being all gathered in proximal end, being scattered under the operating mode of both endsminAs a result it also counts in advance
It calculates, then in the x of three operating modesminAs a result it is minimized in, the final foundation as fan frequency conversion.
By taking the exhaust system positioned at Jiading Campus of Tongji University machinery Yu energy project institute roof as an example, 10 wind are shared
Mouthful, a total exhaust blower.It is 350mm × 350mm that the system, which uses the main air hose of cross-section, size, is separated by between each two branch pipe
3m；Branch length of tube is 1.5m, and cross sectional shape is square, length of side 150mm.In this example, single arms run air quantity is 400m3/
H, design unlatching rate are 0.6.It is 0.6 in unlatching rate, and under the equally distributed operating mode of open position, by designing air guide,
Ensure that each branch pipe exhaust air rate is uniformly distributed.According to design conditions, drag overall of the system under design air flow, which is calculated, is
200Pa, air quantity 2400m3/h.It selects wind turbine model, wind turbine frequency that can change in 15-100Hz according to design conditions, designs work
The corresponding wind turbine frequency of condition is 35Hz.
The present embodiment is illustrated with the rate of opening for 0.4, and when unlatching rate is 0.4, system corresponds to operation total blast volume and is
400m3/ h × 4=1600m3/h.In experiment test, consider three kinds of limit scenes of terminal position, first turn on 1#, 2#, 3#,
The air ports 4#, close other air ports, and adjustment fan operation rotating speed isCorresponding fan operation frequency is 23Hz；
Each air quantity for opening branch is measured using Pitot tube, differential manometer etc., records test result.Similarly, 7#, 8#, 9#, 10# branch are opened
Other branches are closed on road, maintain rotation speed of fan, measure the corresponding air quantity and record for opening branch.Last test unlatching 4#, 5#,
Air quantity under 6#, 7# branch operating mode, result treatment are the following table 1.According to test result, in three kinds of different open position combinations
Under, a worst degree of hydraulic misadjustment x can be obtainedmin=0.89.Thus the correction factor as wind turbine operating, i.e. wind turbine exist
When unlatching rate is 0.4, operating rotating speed is NOperation/xmin, since wind turbine operating rotating speed is proportional with frequency, frequency is repaiied
Just it is being 23Hz/0.89=26Hz.
Test result when 1 unlatching rate of table is 0.4
With reference to the above process, correction factor when by unlatching rate being 0.1,0.2,0.3,0.5,0.7,0.8,0.9,1 is all looked for
Out, as a result as listed in table 2.
The different unlatching rates of table 2 correspond to fan operation frequency
By the corresponding fan operation frequency resultant of each listed unlatching rate in table 2, fan control module is written, passes through end
Hold the detection of unlatching rate, you can provide fan operation frequency, ensure the exhaust air rate design of each branch, so far, complete the system
Simple total air volume control.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to implementations here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (10)
1. a kind of total air volume control method of more end integrated air exhausts, it is characterised in that：In the integrated air exhaust system of more ends,
More ends are monitored to obtain operation required airflow, calculate least favorable degree of hydraulic misadjustment to operation required airflow be modified with
Running exhaust air rate is obtained, controls fan operation accordingly.
2. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：
Including：The unlatching rate that least favorable imbalance degree monitors system-computed according to more ends is solved by off-line method, in advance
Hydraulic regime of the air draft pipe network system under different operation unlatching rates is calculated, a least favorable degree of hydraulic misadjustment and operation are formed
The single-valued relationship of unlatching rate；In addition, according to the Performance Match of wind turbine, the correspondence of air quantity and rotation speed of fan can be obtained,
Gained least favorable degree of hydraulic misadjustment is modified ideal operation air quantity, further according to the correspondence of fan delivery and rotating speed,
Find out fan operation frequency.
3. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：Total air draft
It measures unlatching rate calculated and is multiplied by each tip designs exhaust air rate acquisition；Exhaust air rate is modified by least favorable imbalance degree again,
Running exhaust air rate can be obtained；The running frequency of wind turbine is finally calculated according to this exhaust air rate, controls wind turbine accordingly
Converting operation.
4. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：More ends
The design air flow of each end of integrated air exhaust system is consistent, and there is the operation demand opened and closed at random in each end；In system operation
In, if having monitored, end occurs to open and close variation, and operation unlatching rate is calculated according to following formula：
Least favorable degree of hydraulic misadjustment is further calculated out according to calculated unlatching rate result.
5. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：
If unlatching rate is unchanged, wind turbine maintains former rotating speed operation, if unlatching rate changes, wind turbine needs correspondingly frequency conversion to transport
Row；In air pipeline system, if system waterpower stability is equal to 1, system total impedance is constant, by advance water force and
Fan performance matches, proportional relationship between total blast volume and rotation speed of fan that system needs：
The relational expression of operating status and design point is：
According to the relational expression of rotating speed and frequency：
Calculate running frequency f of the wind turbine under corresponding operating modeOperation；
Wherein, G1Indicate the systematic air flow before frequency conversion；G2Indicate the systematic air flow after frequency conversion；N1Indicate the rotation speed of fan before frequency conversion；
N2Indicate the rotation speed of fan after frequency conversion；
GDesignIndicate the systematic air flow under design conditions；GOperationIndicate the systematic air flow under operating condition；NDesignIt indicates under design conditions
Rotation speed of fan；NOperationIndicate the rotation speed of fan under operating condition；fOperationIndicate the wind turbine frequency under operating condition；P indicates wind turbine
Power.
6. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：
If more end system waterpower stabilitys are not 1, and also cover the combination of many open positions under each unlatching rate
Information has many operating modes under an i.e. unlatching rate；Under each operating mode, if each end has different degree of hydraulic misadjustment x=practical
The flow that operating flux/design needs；Least favorable degree of hydraulic misadjustment under each unlatching rate is calculated, this least favorable
Degree of hydraulic misadjustment is the safety allowance coefficient 1/x under corresponding unlatching rate.
7. the total air volume control method of more end integrated air exhausts according to claim 1, it is characterised in that：
Under a certain unlatching rate, network hydraulic operation state is analyzed, system drag overall is most when terminal position is all gathered in distal end
Big, under same wind turbine frequency, the sum of the operation total blast volume of system is minimum under the operating mode；With each end under the scene
Degree of hydraulic misadjustment minimum value xminAs a result as the safety allowance calculation basis under corresponding unlatching rate, and then by fan operation rotating speed
It is modified toFrequency is modified toTerminal position is further all gathered in proximal end, is scattered under the operating mode at both ends
XminAs a result it also precalculates out, then in the x of three operating modesminAs a result it is minimized in, as the final of fan frequency conversion
Foundation；Wherein, NOperationIndicate the rotation speed of fan under operating condition；fOperationIndicate the wind turbine frequency under operating condition.
8. realizing that more ends of the total air volume control method of any more end integrated air exhausts in claim 1 to 7 are concentrated
The control device of air draft, it is characterised in that：Including at least a frequency conversion fan (1), degree of hydraulic misadjustment calculator (2), one
A more end monitoring systems (3), multiple exhaust system branch pipes (4), end open and close valve (5), and exhaust system is responsible for (6)；Frequency conversion wind
Machine (1) is connected with exhaust system supervisor (6) to provide air draft needed for system, and exhaust system is responsible for (6) and is equipped with several air draft systems
System branch pipe (4), each exhaust system branch pipe (4) are equipped with end and open and close valve (5), more ends monitoring systems (3) and each air draft system
The end being arranged on system branch pipe (4) opens and closes valve (5) and is connected, to obtain monitoring signals, least favorable degree of hydraulic misadjustment calculator (2)
It is connect with more ends monitoring system (3) to obtain the unlatching rate of system, to running frequency, least favorable needed for reponse system wind turbine
Degree of hydraulic misadjustment calculator (2) is connected with frequency conversion fan (1) to transmit current desired running frequency, to reach the total wind of system
Amount control.
9. the control device of more end integrated air exhausts according to claim 8, it is characterised in that：The wind turbine by direct current or
Alternating current generator drives；The degree of hydraulic misadjustment calculator is by completing based on least favorable degree of hydraulic misadjustment and fan operation frequency
It calculates.
10. the control device of more end integrated air exhausts according to claim 8, it is characterised in that：More end monitorings
System transmits information using wired communication mode, by monitoring the case where each end is turned on and off, according to associated information calculation
Go out total unlatching rate；
Preferably, the connection of more end monitoring systems is packed into casing, and inner wall, the outer wall along exhaust system air hose carry out
It is fixedly mounted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109630447A (en) * | 2018-11-01 | 2019-04-16 | 浙江铭振电子股份有限公司 | A kind of control method and fan wall of fan wall |
| CN111271805A (en) * | 2020-03-26 | 2020-06-12 | 同济大学 | Centralized exhaust system and method |
| CN111578432A (en) * | 2019-02-19 | 2020-08-25 | 维谛技术有限公司 | Data center, and refrigeration control method and device of data center |
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| CN109630447A (en) * | 2018-11-01 | 2019-04-16 | 浙江铭振电子股份有限公司 | A kind of control method and fan wall of fan wall |
| CN109630447B (en) * | 2018-11-01 | 2021-04-20 | 浙江铭振电子股份有限公司 | Control method of fan wall and fan wall |
| CN111578432A (en) * | 2019-02-19 | 2020-08-25 | 维谛技术有限公司 | Data center, and refrigeration control method and device of data center |
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| CN111271805A (en) * | 2020-03-26 | 2020-06-12 | 同济大学 | Centralized exhaust system and method |
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| CN108562016B (en) | 2020-08-07 |
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