CN105865105B - The control method and device of chilled water secondary pumping system - Google Patents
The control method and device of chilled water secondary pumping system Download PDFInfo
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- CN105865105B CN105865105B CN201610193038.4A CN201610193038A CN105865105B CN 105865105 B CN105865105 B CN 105865105B CN 201610193038 A CN201610193038 A CN 201610193038A CN 105865105 B CN105865105 B CN 105865105B
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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
- 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
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Abstract
This application discloses the control method of chilled water secondary pumping system and devices.One specific embodiment of the method includes: the flow for acquiring the chilled water in chilled water secondary pumping system and the pressure value between water end (W.E.) and the backwater end；The first impedance based on the pressure value difference between water end (W.E.) and the backwater end, the flow and the preset chilled water secondary pumping system, determines the quantity reference value of the secondary pump under operating status；Quantity and the quantity reference value based on the secondary pump under current operating conditions control the operation of at least one secondary pump in chilled water secondary pumping system.The embodiment effectively reduces the energy consumption of chilled water secondary pumping system.
Description
Technical field
This application involves the control method and device of automation field more particularly to chilled water secondary pumping system.
Background technique
With the continuous soaring of energy cost and to environmentally protective attention, data center to energy-efficient demand increasingly
Strongly.Energy consumption rich and influential family of the chilled water system as large-scale data center, saves and reduces the energy consumption of the system relevant device, for number
Have according to the raising of center infrastructures efficiency and the reduction of electric energy service efficiency (Power Usage Effectiveness) important
Meaning.
It in the prior art, is that the frequency of secondary pump is controlled by pressure difference to the control method of chilled water secondary pumping system, i.e.,
Using the difference of the pressure for water end (W.E.) and the chilled water of backwater end as control variable, come by comparing actual measured value and setting value
The frequency of secondary pump is controlled, and the number of units of secondary pump operation is mainly determined by artificially being judged load capacity, in this way,
The imperfect theories integration of the adjustment of the secondary pump operation number of units of water, more extensive in chilled water secondary pumping system, meanwhile, two
During the adjustment of secondary pump operation number of units, only focuses on being operated without for secondary pump itself and consider system-head curve locating for secondary pump
Variation, causes secondary pump when actual motion to work long hours in characteristic inefficient section, so that chilled water secondary pump system
System inefficiency, is added significantly to power consumption.
Summary of the invention
The purpose of the application is to propose the control method and device of a kind of improved chilled water secondary pumping system, to solve
The technical issues of background section above is mentioned.
In a first aspect, this application provides a kind of control method of chilled water secondary pumping system, the chilled water secondary pump
System includes for water end (W.E.), backwater end, is connected to the pipeline between water end (W.E.) and the backwater end and for driving freezing
At least one secondary pump that water flows in the pipeline, which comprises the freezing in acquisition chilled water secondary pumping system
The flow of water and the pressure value between water end (W.E.) and the backwater end；Based on described between water end (W.E.) and the backwater end
Pressure value difference, the flow and the preset chilled water secondary pumping system the first impedance, determine two under operating status
The quantity reference value of secondary pump；Quantity and the quantity reference value based on the secondary pump under current operating conditions control chilled water
The operation of at least one secondary pump in secondary pumping system.
In some embodiments, the quantity and the quantity reference value based on the secondary pump under current operating conditions,
Control the operation of at least one secondary pump in chilled water secondary pumping system, comprising: judge the secondary pump under current operating conditions
Quantity and the quantity reference value it is whether equal；If equal, the chilled water for water end (W.E.) and the backwater end is acquired
Temperature value；Based on the preset range for water end (W.E.) and the chilled water temperature value difference of the backwater end and chilled water temperature value difference,
Adjust the running frequency of the secondary pump under current operating conditions.
In some embodiments, the method also includes: judge the chilled water temperature value difference for water end (W.E.) and backwater end
Whether in the preset range of the chilled water temperature value difference；If in the preset range of the chilled water temperature value difference,
Increase the valve opening of regulating valve, the regulating valve is set in pipeline, for controlling the flow of chilled water in the pipeline.
In some embodiments, described based on the pressure value difference between water end (W.E.) and the backwater end, the flow
With the first impedance of the preset chilled water secondary pumping system, the quantity reference value of the secondary pump under operating status is determined, wrap
It includes: determining taking for the secondary pump quantity under operating status according to the sum for the secondary pump for including in the chilled water secondary pumping system
It is worth range；Based on the pressure value difference, the flow, the corresponding freezing of each value in the value range is calculated separately
Second impedance of water secondary pumping system, obtains the set of the second impedance；Selection meets default in the set of second impedance
Second impedance of condition, the preset condition are arranged based on first impedance；Selected second impedance is corresponding
The quantity of secondary pump under operating status is determined as the quantity reference value of the secondary pump under operating status.
In some embodiments, first impedance is the spy for the secondary pump for including based on the chilled water secondary pumping system
Linearity curve and it is pre-set.
Second aspect, this application provides the control device of chilled water secondary pumping system, the chilled water secondary pumping system
Including for water end (W.E.), backwater end, be connected to the pipeline between water end (W.E.) and the backwater end and for driving chilled water to exist
At least one secondary pump flowed in the pipeline, which is characterized in that described device includes: acquisition unit, for acquiring freezing
The flow of chilled water in water secondary pumping system and the pressure value between water end (W.E.) and the backwater end；Determination unit,
For based on the pressure value difference between water end (W.E.) and the backwater end, the flow and the preset chilled water secondary pump
First impedance of system determines the quantity reference value of the secondary pump under operating status；Control unit, for based on current operation shape
The quantity of secondary pump under state and the quantity reference value control the fortune of at least one secondary pump in chilled water secondary pumping system
Row.
In some embodiments, described control unit is further configured to: judging the secondary pump under current operating conditions
Quantity and the quantity reference value it is whether equal；If equal, the chilled water for water end (W.E.) and the backwater end is acquired
Temperature value；Based on the preset range for water end (W.E.) and the chilled water temperature value difference of the backwater end and chilled water temperature value difference,
Adjust the running frequency of the secondary pump under current operating conditions.
In some embodiments, described device further include: adjust valve regulation unit, be configured to judge it is described for water end (W.E.) and
Whether the chilled water temperature value difference of backwater end is in the preset range of the chilled water temperature value difference；If in the freezing temperature
In the preset range of angle value difference, then increase the valve opening of regulating valve, the regulating valve is set in pipeline, described for controlling
The flow of chilled water in pipeline.
In some embodiments, the determination unit, comprising: value range determining module is configured to according to described cold
The sum for freezing the secondary pump for including in water secondary pumping system determines the value range of the secondary pump quantity under operating status；Calculate mould
Block, each value for being configured to calculate separately based on the pressure value difference, the flow in the value range are corresponding described
Second impedance of chilled water secondary pumping system, obtains the set of the second impedance；Selecting module is configured in second impedance
Set in selection meet the second impedance of preset condition, the preset condition is arranged based on first impedance；Quantity
Reference value determining module is configured to for the quantity of the secondary pump under the corresponding operating status of selected second impedance being determined as
The quantity reference value of secondary pump under operating status.
In some embodiments, first impedance is the spy for the secondary pump for including based on the chilled water secondary pumping system
Linearity curve and it is pre-set.
The control method and device of chilled water secondary pumping system provided by the present application, by acquiring chilled water secondary pumping system
In chilled water flow and the pressure value between water end (W.E.) and the backwater end, then based on described for water end (W.E.) and institute
The first impedance of the pressure value difference, the flow and the preset chilled water secondary pumping system between backwater end is stated, determines fortune
The quantity reference value of secondary pump under row state, quantity and quantity ginseng finally based on the secondary pump under current operating conditions
Value is examined, the operation of at least one secondary pump in chilled water secondary pumping system is controlled, effectively reduces chilled water secondary pumping system
Energy consumption.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the flow chart according to one embodiment of the control method of the chilled water secondary pumping system of the application；
Fig. 2 is the schematic diagram according to an application scenarios of the control method of the chilled water secondary pumping system of the application；
Fig. 3 is the flow chart according to another embodiment of the control method of the chilled water secondary pumping system of the application；
Fig. 4 is the structural schematic diagram according to one embodiment of the control device of the chilled water secondary pumping system of the application；
Fig. 5 is adapted for the structural schematic diagram for realizing the controller of the embodiment of the present application.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to related invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
With reference to Fig. 1, it illustrates according to one embodiment of the control method of the chilled water secondary pumping system of the application
Process 100.
Chilled water secondary pumping system include for water end (W.E.), backwater end, be connected between water end (W.E.) and backwater end pipeline and
At least one secondary pump for driving chilled water to flow in the duct, the control method of above-mentioned chilled water secondary pumping system, packet
Include following steps:
Step 101, the flow of the chilled water in chilled water secondary pumping system and the pressure for water end (W.E.) and backwater end are acquired
Value.
In the present embodiment, the electronic equipment of the control method operation of chilled water secondary pumping system thereon can be control
Device, such as programmable logic controller (PLC) (Programmable Logic Controller, PLC) or other programming devices.
Controller can the flow of the collected chilled water of sampler and for water end (W.E.), the pressure value of backwater end in reading system.It adopts
Collecting device includes flowmeter, pressure gauge.
In the present embodiment, chilled water is that cooling capacity is transmitted to the matchmaker that end load carries out cold and hot exchange by precision air conditioner
Matter is the carrier of export load heat.Secondary pump refers to load side water pump and load side end-equipment, pipe-line system and bypass
Pipe constitutes secondary loop.Corresponding with the secondary pump in the present embodiment, it may include primary for providing in the device of above-mentioned chilled water
Pump, primary pump refers to cold source side water pump corresponding with water cooler, and forms a loop with water cooler and bypass pipe.It is cold
Freeze flow, that is, secondary side total flow of water, can be obtained by the way that flow measurement is arranged in chilled water backwater end.
Step 102, based on for pressure value difference, flow and the preset chilled water secondary pumping system between water end (W.E.) and backwater end
The first impedance, determine the quantity reference value of the secondary pump under operating status.
In the present embodiment, it is obtained based on step 101 for the pressure value of water end (W.E.) and backwater end, flow, preset first resistance
Anti-, above controller can be calculated first for the pressure value difference between water end (W.E.) and backwater end；Later again by being based on above-mentioned pressure value
Difference, flow and the first impedance, determine the quantity reference value of the secondary pump under operating status.Impedance can be regarded as the pipe network of secondary side
Impedance, the first impedance can be corresponding impedance value when the secondary the way highest in chilled water secondary pumping system.Operation
The quantity reference value of secondary pump under state can be to be run when secondary the way highest in chilled water secondary pumping system
The quantity of secondary pump.
In some optional implementations of the present embodiment, the first impedance be can be based on chilled water secondary pumping system packet
The characteristic curve of the secondary pump included and it is pre-set.The Specifeca tion speeification of pump includes flow Q, lift H, shaft power N and effect
Rate η.Relationship between performance parameter is measured by testing, and one measured group relation curve is known as the characteristic curve pumped or working performance
Curve, this curve is usually provided by the manufactory pumped, and is invested in pump test sample or specification.It is bent with η-Q in characteristic curve
For line, η-Q curve embodies the efficiency of pump and the relationship of flow.Best efficiency point in η-Q curve, commonly referred to as design point
Or operating point.The economy the most that works under flow corresponding with peak efficiency and lift is pumped, so corresponding with best efficiency point
Q, H, N value be known as optimum condition parameter.It also can analyze the first resistance for calculating chilled water secondary pumping system by above-mentioned parameter
It is anti-.
In some optional implementations of the present embodiment, in order to determine the quantity reference of the secondary pump under operating status
Value can determine the number of the secondary pump under operating status according to the sum for the secondary pump for including in chilled water secondary pumping system first
It include three secondary pumps in the value range of amount, such as chilled water secondary pumping system, then the number of the secondary pump under operating status
The value range of amount is one to three；Later according under current state between water end (W.E.) and backwater end pressure value difference △ P and freezing
The flow Q of chilled water in water secondary pumping system, by formula K=△ P/ (Q/t)2Calculate different secondary pump operation number of units corresponding the
Two impedances, wherein K indicates the second impedance, and t is the operation number of units of secondary pump, and the value range of t can be under above-mentioned operating status
Secondary pump quantity value range；It is finally selected in the set for the second impedance being calculated and meets preset condition
Second impedance, two quantity of the secondary pump under the corresponding operating status of selected second impedance is determined as under operating status
The quantity reference value of secondary pump.Wherein, preset condition is arranged based on the first impedance, meets preset condition for example, selecting
Second impedance can be the second impedance of selection closest to the first impedance.May also occur multiple closest to the second of the first impedance
The case where impedance, can choose the smallest second impedance of operation number of units of corresponding secondary pump at this time.For example, the first impedance is
1.0×1010Pa, the second impedance is 1.01 × 10 when calculating five secondary pumps of operation10Pa, second when running three secondary pumps
Impedance is 0.99 × 1010Pa, then, the quantity reference value of the secondary pump under operating status is 3.
It, can also be by formula K=△ P/ (Q/t) in some optional implementations of the present embodiment2In K be equal to first
Impedance, at the same substitute under the current state of acquisition between water end (W.E.) and backwater end pressure value difference △ P and chilled water secondary pump system
The flow Q of chilled water in system, acquires the value of t.The t value acquired at this time may not be integer, can under operation two
Select the quantity closest to the t value acquired as quantity reference value in the value range of the quantity of secondary pump.
Step 103, quantity and quantity reference value based on the secondary pump under current operating conditions control chilled water secondary pump
The operation of at least one secondary pump in system.
In the present embodiment, the quantity reference value determined based on step 102, above controller can pass through Direct Digital control
The fortune of at least one secondary pump in device (Direct Digital Controller, DDC) control chilled water secondary pumping system processed
Row.For example, controller can keep the quantity of secondary pump and quantity reference value equal by opening or closing secondary pump.
In some optional implementations of the present embodiment, it can be determined that the quantity of the secondary pump under current operating conditions
It is whether equal with above-mentioned quantity reference value；If equal, the freezing temperature angle value for water end (W.E.) and backwater end is acquired；Based on water supply
The preset range of the chilled water temperature value difference and chilled water temperature value difference of end and backwater end is adjusted secondary under current operating conditions
The running frequency of pump.It, can be straight for water end (W.E.) and the chilled water temperature value difference of backwater end in chilled water secondary pumping system operational process
Junctor now loads one group of parameter most sensitive in variation and chilled water system.By the feedback energy of chilled water temperature value difference and
When adjust secondary pump frequency, make a response at the first time to the variation of load.When load increase when, for water end (W.E.) and backwater end
Chilled water temperature value difference increases, and increases secondary pump frequency at this time, increases the conveying capacity of chilled water, with available power；
When the load decreases, also decreased for the chilled water temperature value difference of water end (W.E.) and backwater end, at this time reduce secondary pump frequency with
Reduce the power consumption of every secondary pump.
In some optional implementations of the present embodiment, the chilled water temperature for water end (W.E.) and backwater end can also be judged
Whether value difference is in the preset range of chilled water temperature value difference；If increased in the preset range of chilled water temperature value difference
The valve opening of regulating valve, regulating valve are set in pipeline, for controlling the flow of chilled water in pipeline.Temperature value difference is default
When in range, illustrate the power match bearing power of secondary pump, the aperture at this moment increasing regulating valve reaches maximum, reduces system resistance
Power further improves the efficiency of system to reduce power consumed by conveying chilled water.
With continued reference to the application scenarios that Fig. 2, Fig. 2 are according to the control method of the chilled water secondary pumping system of the present embodiment
One schematic diagram, including a kind of typical data center's chilled water secondary side device and its control module.
In Fig. 2 heavy line can indicate secondary side chilled water for water return pipeline, dotted line can indicate various kinds of equipment and its
Signal transmission path between corresponding controller.
Control module mainly includes control equipment, transmission device and host computer in Fig. 2.Host computer may include chilled water two
The server and/or work station of secondary pumping system, have the human-computer interactions such as remote control, parameter configuration, showing interface, data monitoring
Function.Transmission device can be the network switch, by between Industrial Ethernet Ethernet and host computer and lower level controller
Construct network bridge.Control equipment includes DDC controller and PLC controller, and it is existing that the two is all made of Modbus communications protocol industry
Field bus RS485 Design of Communication Interface, is connected with end-equipment.Wherein, PLC controller carries the control of chilled water secondary pumping system
The frequency of the kernel program of method, i.e., determination, separate unit secondary pump including secondary pump operation number of units adjusts and the plus-minus of secondary pump
Control is carried, and reads various kinds of sensors and the value of feedback of control valve opening on secondary lateral line, completes relevant calculation or control.
DDC controller is then configured to individually control and detect each secondary pump, can be between PLC controller and each DDC controller
It is realized and is interconnected by Ethernet.
Chilled water secondary side device mainly includes that each secondary pump unit, end execute all kinds of biographies on equipment and pipeline in Fig. 2
Sensor.Secondary pump unit includes that several secondary pumps, regulating valve and butterfly valve, wherein secondary pump and regulating valve pass through RS485 bus
It is connected respectively with DDC or PLC controller, long-range control is realized with this.Butterfly valve then can be to manually control, it is ensured that regulating valve work
Make state it is abnormal when, can be realized pipeline and cut off on the spot.It may include air-conditioner set, water valve and fan unit that end, which executes equipment,
Pipe.The various kinds of sensors freezed on water ring net pipeline includes chilled water backwater end temperature sensor T1, chilled water is for water end (W.E.) temperature
Sensor T2, end differential pressure pickup P and secondary side flowmeter, the output end of various kinds of sensors can by RS485 bus with
The I/O module of PLC controller is connected.
The flow that the method provided by the above embodiment of the application passes through the chilled water in acquisition chilled water secondary pumping system
And for the pressure value between water end (W.E.) and backwater end, based on for pressure value difference, the flow and preset between water end (W.E.) and backwater end
First impedance of chilled water secondary pumping system determines the quantity reference value of the secondary pump under operating status, based on current operation shape
The quantity and quantity reference value of secondary pump under state control the operation of at least one secondary pump in chilled water secondary pumping system,
Effectively reduce the energy consumption of chilled water secondary pumping system.
With further reference to Fig. 3, it illustrates the processes of another embodiment of the control method of chilled water secondary pumping system
300.The process 300 of the control method, comprising the following steps:
Step 301, system initialization judges whether system each unit state is normal.
In the present embodiment, after system electrification initialization, controller reads the feedback letter of secondary pump unit and end-equipment
The feedback information of breath, secondary pump unit and end-equipment includes the number of units t that current chilled water secondary pump is opened0And its running frequency
F, each unit correspond to the state of regulating valve, the water valve aperture R of tail end air conditioner unit0And rotation speed of fan V0, and judge unit and secondary
Whether pump unit operating status is normal, if it is judged that the abnormal unit of existence then enters step 302 in system, if
Judge that system each unit state normally then enters step 303.
Step 302, it alerts.
In the present embodiment, if monitoring system each unit operating parameter and pre-set standard operating parameter not
Symbol, then send the parameter information of abnormal parameter and its information of said units by way of alarm to host computer.
Step 303, current end pressure difference △ P and secondary side flow Q is acquired, and obtains the pipe network impedance of host computer setting
K0。
In the present embodiment, host computer can be server and/or work station.Acquire current end pressure difference △ P and secondary
Effluent amount Q can be carried out periodically, and the period being acquired can be according to actual set.
The pipe network impedance K of host computer setting0It can be and obtained according to the characteristic curve analytical calculation of secondary pump.
Step 304, the secondary pump situation of different number of units is opened in simulation, analyzes the variation of pipe network impedance.
Calculate separately K=△ P/Q2, △ P/ (Q/2)2... △ P/ (Q/n)2, and with setting value K0It is poor to make, wherein n table
Show the total number of units for the secondary pump that can be run.
Step 305, the variation of the pipe network impedance number of units that corresponding secondary pump is opened when minimum is determined as under conditions present
Optimal secondary pump opens number of units.
To the analysis of pipe network impedance variations as a result, when opening the secondary pump of different number of units in available step 304 | △
P/(Q/t)2-K0| value, if there are minimum values for the absolute value of pipe network impedance variations value, i.e., | △ P/ (Q/t)2-K0| min exists,
The number of units that corresponding secondary pump is opened when then the corresponding secondary pump number of units t of this minimum value is the variation minimum of pipe network impedance；If depositing
Two or more | △ P/ (Q/t)2-K0| value it is equal, i.e., | △ P/ (Q/t1)2-K0|=...=| △ P/ (Q/tm)2-
K0| when, then the operation number of units of secondary pump takes a kind of wherein the smallest situation, i.e. t '=min { t1..., tmBe conditions present under most
Excellent secondary pump opens number of units.
Step 306, judge whether current secondary pump operation number of units with optimal secondary pump under conditions present opens number of units phase
Deng.
The current secondary pump operation number of units t read in comparison step 3010And in step 305 under identified conditions present
The size of secondary pump optimized operation number of units t '.If the two is equal, 308 are entered step；If the two is unequal, enter step
307。
Step 307, secondary pump operation number of units is adjusted to secondary pump optimized operation number of units under conditions present.
While secondary pump operation number of units is adjusted to secondary pump optimized operation number of units t ' under conditions present, due to secondary pump
The variation of number of units is opened, the secondary side flow and end pressure difference of chilled water system also change correspondingly, therefore turn again to step
303, read relevant parameter, calculate new secondary pump optimized operation number of units, until current secondary pump operation number of units and secondary pump most
Excellent operation number of units is equal.
Step 308, temperature T of the acquisition secondary side for backwater end chilled water1、T2Calculating temperature difference △ T, and judge △ T whether etc.
In preset temperature difference.
If otherwise entering step 309, if it is the water valve of adjustable tail end air conditioner unit reaches its aperture most
Greatly, reduce system resistance, to reduce power consumed by conveying refrigerating medium.
In the present embodiment, when judging whether △ T is equal to preset temperature difference, it is also possible to judge △ T whether at one
In the range of preset temperature difference.For example, preset temperature difference is 10 degrees Celsius, the range of preset temperature difference can be 8 and take the photograph
For family name's degree to 12 degrees Celsius, △ T is also approximately considered △ T equal to preset temperature difference when being 9 degrees Celsius, avoids subsequent step with this
In unnecessary frequent adjustment.
Step 309, secondary pump frequency is adjusted according to the size relation of temperature difference △ T and preset temperature difference, make temperature difference △ T with
Preset temperature difference matching.
When supply backwater temperature difference △ T is greater than preset temperature difference, increase secondary pump frequency according to preset gradient；When supplying back
When water temperature difference △ T is less than preset temperature difference, reduce secondary pump frequency according to preset gradient, thus gradually secondary pump frequency,
Finally it is equal or approximately equal supply backwater temperature difference with preset temperature difference.
Step 310, judge to adjust △ P before and after secondary pump frequency, whether the variable quantity of Q is more than preset range.
If it is step 303 is returned to.After secondary pump frequency adjustment, system end pressure difference △ P and the secondary effluent of chilled water
Amount changes, and may return to step 303 if variation is excessive and continues to acquire relevant parameter, and judges that system runs mould again
Formula, it is ensured that secondary pump can be operated in always in its characteristic high efficiency range.If after secondary pump frequency adjustment, system end
Side pressure difference △ P and chilled water secondary side changes in flow rate are little, then it is secondary to repeat chilled water according to the pre-set period
The process 300 of pumping system control method, the situation for avoiding the excessive system of data volume unstable.
From figure 3, it can be seen that the chilled water secondary pumping system control compared with the corresponding embodiment of Fig. 1, in the present embodiment
The process 300 of method processed highlights the step of working frequency of the number of units and secondary pump that adjust secondary pump.The present embodiment as a result,
The scheme of description can more in saving system secondary pumping unit power consumption, to realize the efficient fortune of chilled water secondary pumping system
Row.
The above embodiments of the present application are the optimization to the existing secondary pump operational mode of data center.
First, the control amount of the secondary pump frequency of separate unit is become into supply backwater temperature difference from pressure difference, make secondary pump frequency relative to
End load variation is more sensitive, and adjustment is much sooner.When load becomes smaller, secondary pump frequency is reduced rapidly, so that it is in height
The runing time of frequency range is reduced, and saves the energy consumption of every equipment.Made simultaneously by the adjusting of water pump frequency in operation air-conditioning
Water valve aperture reaches maximum, reduces system resistance, reduces power consumed by conveying refrigerating medium.
Second, the variation of moment attention location system system-head curve, by comparing the size of pipe network impedance under same frequency, to determine
Under system conditions present, the operation number of units of secondary pump.This scheme, so that system is guaranteeing every water pump all closest to itself
While characteristic curve operating point, secondary pump operation number of units is as few as possible, greatly reduces the energy consumption of whole system.
Third, control strategy proposed by the invention are improved for the defect of original scheme, are realized secondary side and are set
Standby comprehensive automation improves data center's intelligence degree, reduces the artificial work for participating in operation, saves certain
Human capital.
With further reference to Fig. 4, as the realization to method shown in above-mentioned each figure, this application provides a kind of chilled water is secondary
One embodiment of the control device of pumping system, the Installation practice is corresponding with embodiment of the method shown in FIG. 1, device tool
Body can be applied in various electronic equipments.
As shown in figure 4, in the present embodiment chilled water secondary pumping system include for water end (W.E.), backwater end, be connected to for water end (W.E.) and
Pipeline between backwater end and at least one secondary pump for driving chilled water to flow in the duct.Chilled water secondary pump system
The control device 400 of system includes: acquisition unit 401, determination unit 402 and control unit 403.Wherein, acquisition unit 401 configures
For acquiring the flow of the chilled water in chilled water secondary pumping system and for the pressure value between water end (W.E.) and backwater end；It determines single
Member 402 is configured to based on for pressure value difference, flow and the preset chilled water secondary pumping system between water end (W.E.) and backwater end
First impedance determines the quantity reference value of the secondary pump under operating status；And control unit 403 is configured to based on current operation
The quantity and quantity reference value of secondary pump under state control the fortune of at least one secondary pump in chilled water secondary pumping system
Row.
In the present embodiment, the electronic equipment of the control method operation of chilled water secondary pumping system thereon can be control
Device, such as programmable logic controller (PLC) or other programming devices, controller can read acquisition unit 401 and pass through collector
The flow of the collected chilled water of part, and for water end (W.E.), the pressure value of backwater end.Sampler includes flowmeter, pressure gauge.
In the present embodiment, it is obtained based on acquisition unit 401 for the pressure value of water end (W.E.) and backwater end, flow, preset
One impedance, above controller can be calculated first for the pressure value difference between water end (W.E.) and backwater end；Later again by being based on above-mentioned pressure
Force value is poor, flow and the first impedance, determines the quantity reference value of the secondary pump under operating status.Impedance can be regarded as secondary side
Pipe network impedance, the first impedance can be corresponding impedance value when the secondary the way highest in chilled water secondary pumping system.
The quantity reference value of secondary pump under operating status can be secondary the way highest luck in chilled water secondary pumping system
The quantity of capable secondary pump.
In the present embodiment, it is based on 402 quantification reference value of determination unit, above controller can pass through Direct Digital
Controller controls the operation of at least one secondary pump in chilled water secondary pumping system.For example, controller can by open or
Closing secondary pump keeps the quantity of secondary pump and quantity reference value equal.
In some optional implementations of the present embodiment, control unit 403 is further configured to judge currently to transport
Whether the quantity and quantity reference value of the secondary pump under row state are equal；If equal, acquire for the cold of water end (W.E.) and backwater end
Freeze water temperature angle value；Based on the preset range of chilled water temperature value difference and chilled water temperature value difference for water end (W.E.) and backwater end, adjust
The running frequency of secondary pump under current operating conditions.
In some optional implementations of the present embodiment, above-mentioned apparatus further include: adjust valve regulation unit, configuration is used
In judging for water end (W.E.) and the chilled water temperature value difference of backwater end whether in the preset range of chilled water temperature value difference；If cold
Freeze in the preset range of coolant-temperature gage value difference, then increase the valve opening of regulating valve, regulating valve is set in pipeline, for controlling pipe
The flow of chilled water in road.
In some optional implementations of the present embodiment, determination unit 402, comprising: value range determining module is matched
Set taking for the secondary pump quantity determined under operating status for the sum according to the secondary pump for including in chilled water secondary pumping system
It is worth range；Computing module, each value for being configured to calculate separately based on pressure value difference, flow in above-mentioned value range are corresponding
Chilled water secondary pumping system the second impedance, obtain the set of the second impedance；Selecting module is configured in the second impedance
Selection meets the second impedance of preset condition in set, and preset condition is arranged based on the first impedance；Quantity reference value determines
Module is configured to for the quantity of the secondary pump under the corresponding operating status of selected second impedance being determined as under operating status
Secondary pump quantity reference value.
In some optional implementations of the present embodiment, the first impedance is to include based on chilled water secondary pumping system
The characteristic curve of secondary pump and it is pre-set.
Below with reference to Fig. 5, it illustrates the structural schematic diagrams for the controller 500 for being suitable for being used to realize the embodiment of the present application.
As shown in figure 5, controller 500 includes central processing unit (CPU) 501, it can be according in storage section 506
Program and execute various movements appropriate and processing.CPU 501 is connected with input/output (I/O) interface 503 by bus 502.
I/O interface 503: importation 504 is connected to lower component；Output par, c 505；Storage section including hard disk etc.
506；And the communications portion 507 of the network interface card including LAN card, modem etc..Communications portion 507 is via all
As the network of internet executes communication process.
Particularly, in accordance with an embodiment of the present disclosure, it may be implemented as computer above with reference to the process of flow chart description
Software program.For example, embodiment of the disclosure includes a kind of computer program product comprising be tangibly embodied in machine readable
Computer program on medium, the computer program include the program code for method shown in execution flow chart.At this
In the embodiment of sample, which can be loaded and be installed by communications portion 507.
Flow chart and block diagram in attached drawing are illustrated according to the system of the various embodiments of the application, method and computer journey
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part of one module, program segment or code of table, a part of the module, program segment or code include one or more
Executable instruction for implementing the specified logical function.It should also be noted that in some implementations as replacements, institute in box
The function of mark can also occur in a different order than that indicated in the drawings.For example, two boxes succeedingly indicated are practical
On can be basically executed in parallel, they can also be executed in the opposite order sometimes, and this depends on the function involved.Also it wants
It is noted that the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, Ke Yiyong
The dedicated hardware based system of defined functions or operations is executed to realize, or can be referred to specialized hardware and computer
The combination of order is realized.
Being described in unit involved in the embodiment of the present application can be realized by way of software, can also be by hard
The mode of part is realized.Described unit also can be set in the processor, for example, can be described as: a kind of controller packet
Include acquisition unit, determination unit and control unit.Wherein, the title of these units is not constituted under certain conditions to the unit
The restriction of itself, for example, acquisition unit is also described as " for acquiring the stream of the chilled water in chilled water secondary pumping system
Amount and for the pressure value between water end (W.E.) and backwater end unit ".
As on the other hand, present invention also provides a kind of computer readable storage medium, the computer-readable storage mediums
Matter can be computer readable storage medium included in device described in above-described embodiment；It is also possible to individualism, not
The computer readable storage medium being fitted into terminal.The computer-readable recording medium storage have one or more than one
Program, described program are used to execute the chilled water secondary pumping system for being described in the application by one or more than one processor
Control method.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (8)
1. a kind of control method of chilled water secondary pumping system, the chilled water secondary pumping system include for water end (W.E.), backwater end, company
It connects in the pipeline between water end (W.E.) and the backwater end and for driving chilled water to flow at least in the pipeline
One secondary pump, which is characterized in that the described method includes:
The flow of chilled water in acquisition chilled water secondary pumping system and the pressure between water end (W.E.) and the backwater end
Value；
Based on the pressure value difference between water end (W.E.) and the backwater end, the flow and the preset chilled water secondary pump
First impedance of system determines the quantity reference value of the secondary pump under operating status；
Quantity and the quantity reference value based on the secondary pump under current operating conditions control in chilled water secondary pumping system
The operation of at least one secondary pump；
Wherein, described based on the pressure value difference between water end (W.E.) and the backwater end, the flow and preset described cold
The first impedance for freezing water secondary pumping system, determines the quantity reference value of the secondary pump under operating status, comprising:
The secondary pump quantity under operating status is determined according to the sum for the secondary pump for including in the chilled water secondary pumping system
Value range；
Based on the pressure value difference, the flow, the corresponding chilled water of each value in the value range is calculated separately
Second impedance of secondary pumping system, obtains the set of the second impedance；
Selection meets the second impedance of preset condition in the set of second impedance, and the preset condition is based on described the
One impedance setting；
The quantity of secondary pump under the corresponding operating status of selected second impedance is determined as the secondary pump under operating status
Quantity reference value.
2. the method according to claim 1, wherein the quantity based on the secondary pump under current operating conditions
With the quantity reference value, the operation of at least one secondary pump in chilled water secondary pumping system is controlled, comprising:
Judge whether quantity and the quantity reference value of the secondary pump under current operating conditions are equal；
If equal, the freezing temperature angle value for water end (W.E.) and the backwater end is acquired；
Based on the preset range for water end (W.E.) and the chilled water temperature value difference of the backwater end and chilled water temperature value difference, adjust
The running frequency of secondary pump under current operating conditions.
3. according to the method described in claim 2, it is characterized in that, the method also includes:
Judge it is described for water end (W.E.) and the chilled water temperature value difference of backwater end whether the chilled water temperature value difference preset range
It is interior；
If increasing the valve opening of regulating valve in the preset range of the chilled water temperature value difference, the regulating valve is set
It is placed in pipeline, for controlling the flow of chilled water in the pipeline.
4. the method according to claim 1, wherein first impedance is based on chilled water secondary pump system
The characteristic curve for the secondary pump that system includes and it is pre-set.
5. a kind of control device of chilled water secondary pumping system, the chilled water secondary pumping system include for water end (W.E.), backwater end, company
It connects in the pipeline between water end (W.E.) and the backwater end and for driving chilled water to flow at least in the pipeline
One secondary pump, which is characterized in that described device includes:
Acquisition unit, for acquiring the flow of the chilled water in chilled water secondary pumping system and described for water end (W.E.) and the return water
Pressure value between end；
Determination unit, for based on the pressure value difference between water end (W.E.) and the backwater end, the flow and preset institute
The first impedance for stating chilled water secondary pumping system determines the quantity reference value of the secondary pump under operating status；
Control unit controls chilled water for quantity and the quantity reference value based on the secondary pump under current operating conditions
The operation of at least one secondary pump in secondary pumping system；
Wherein, the determination unit, comprising:
Value range determining module is configured to be determined according to the sum for the secondary pump for including in the chilled water secondary pumping system
The value range of secondary pump quantity under operating status；
Computing module is configured to calculate separately each value in the value range based on the pressure value difference, the flow
Second impedance of the corresponding chilled water secondary pumping system, obtains the set of the second impedance；
Selecting module is configured to the second impedance that the selection in the set of second impedance meets preset condition, described pre-
If condition is arranged based on first impedance；
Quantity reference value determining module is configured to the number of the secondary pump under the corresponding operating status of selected second impedance
Measure the quantity reference value for the secondary pump being determined as under operating status.
6. device according to claim 5, which is characterized in that described control unit is further configured to:
Judge whether quantity and the quantity reference value of the secondary pump under current operating conditions are equal；
If equal, the freezing temperature angle value for water end (W.E.) and the backwater end is acquired；
Based on the preset range for water end (W.E.) and the chilled water temperature value difference of the backwater end and chilled water temperature value difference, adjust
The running frequency of secondary pump under current operating conditions.
7. device according to claim 6, which is characterized in that described device further include:
Adjust valve regulation unit, be configured to judge it is described for water end (W.E.) and the chilled water temperature value difference of backwater end whether described cold
Freeze in the preset range of coolant-temperature gage value difference；If increasing regulating valve in the preset range of the chilled water temperature value difference
Valve opening, the regulating valve are set in pipeline, for controlling the flow of chilled water in the pipeline.
8. device according to claim 5, which is characterized in that first impedance is based on chilled water secondary pump system
The characteristic curve for the secondary pump that system includes and it is pre-set.
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| CN111918523B (en) * | 2020-06-28 | 2023-05-09 | 北京百度网讯科技有限公司 | Refrigerating system, control method and equipment of refrigerating system and storage medium |
| CN112665233A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Control method and device for chilled water secondary pump, controller and water pump system |
| CN112880121A (en) * | 2021-01-22 | 2021-06-01 | 珠海格力电器股份有限公司 | Air conditioner water system terminal pressure difference control method and device, storage medium and air conditioner |
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