CN106679103B - A kind of central air conditioner system refrigerating water pump water-supply control and device - Google Patents

A kind of central air conditioner system refrigerating water pump water-supply control and device Download PDF

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CN106679103B
CN106679103B CN201710018329.4A CN201710018329A CN106679103B CN 106679103 B CN106679103 B CN 106679103B CN 201710018329 A CN201710018329 A CN 201710018329A CN 106679103 B CN106679103 B CN 106679103B
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water
pressure
air conditioner
conditioner system
central air
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CN106679103A (en
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薛雪
刚文杰
颜承初
孙雪
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Shenzhen Das Intellitech Co Ltd
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Shenzhen Das Intellitech Co Ltd
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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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F24F11/64—Electronic processing using pre-stored data

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention relates to central air conditioner system refrigerating water pump water-supply control and devices, the method comprising the steps of: S1, in the refrigerating water pump operational process of central air conditioner system, acquires the supply and return water temperature of freezing water conduit tube, for the valve opening of user terminal air processing machine chilled water pipeline each in pressure of return water and central air conditioner system in t moment；S2, according to chilled water supply and return water temperature collected, for pressure of return water, obtain chilled water supply backwater temperature difference value and the pressure difference for pressure of return water；S3, step S2 execute while, calculate each user terminal air processing machine chilled water pipeline of central air conditioner system valve opening in t moment exceed threshold value quantity N；S4, the pressure difference of chilled water is compared with the pressure differential resetting value of chilled water, chilled water is obtained in the comparison result of t moment pressure difference, and combined amount N obtains the control model that refrigerating water pump exports in corresponding moment t, and the operation of refrigerating water pump is controlled according to control model.This method is simple to operation, and can effectively energy conservation.

Description

A kind of central air conditioner system refrigerating water pump water-supply control and device
Technical field
The present invention relates to the technical fields of building Large Central Air Conditioning System, more specifically to a kind of central air conditioner system Refrigerating water pump water-supply control and device.
Background technique
In China, building energy consumption total amount in 2014 is more than 12.5 hundred million tons of standard coals, Zhan Shehui total energy consumption 30%.Central air-conditioning Energy consumption accounts for building total energy consumption 65%, wherein Air Conditioning Facilities energy consumption accounts for air conditioning energy consumption 70% or so.Whether chilled water system can Enough efficient operations play a crucial role Air Conditioning Facilities energy consumption height.The control method of traditional chilled water system has dry Pipe determines temperature difference control method and main pipe constant pressure difference control method, both control methods cut both ways.Main pipe determines temperature difference controlling party Method has benefited from it and is locked out optimal chilled water supply backwater temperature difference (or chilled water return water temperature), therefore, chilled water and refrigerating water pump Heat exchange efficiency it is high, energy-saving effect is obvious, but since this method is concerned only with supply and return water temperature, has ignored the pressure monitoring for return water And control, it be easy to cause air conditioning terminal part end water conservancy to lack of proper care；Main pipe constant pressure difference control method has benefited from its pressure/pressure difference and protects (i.e. flow guarantee) control is demonstrate,proved, when the certain branch road valves of air conditioning terminal turn down or close, other bypass flows are all larger than design Hydraulic misadjustment phenomenon will not occur for flow, and hydraulic stability is got well than determining temperature difference control, though main pipe level pressure difference can protect It is in liberal supply but and not energy-efficient to demonstrate,prove chilled water system index circuit chilled water.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of central air-conditioning system System refrigerating water pump water-supply control and device.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of central air conditioner system freezing water supplying pump Control method, comprising the following steps:
S1, in the refrigerating water pump operational process of central air conditioner system, t moment acquire freezing water conduit tube supply water temperature Tsup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd each user terminal air in the central air conditioner system The valve opening S of processor chilled water pipeline1, S2... Sk, K is more than or equal to 1；
S2, according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water PsupAnd pressure of return water Prtn, obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ TactAnd pressure of return water PrtnWith Pressure of supply water PsupBetween pressure difference Δ Pact；
Wherein, Δ Tact=Trtn-Tsup；
ΔPact=Prtn-Psup；
S3, the step S2 execute while, it is cold to calculate each user terminal air processing machine of the central air conditioner system Freeze the valve opening S of water lines1, S2... SkIn in t moment exceed the quantity N of threshold value, and the number is calculated by the following formula Measure N；
Wherein, n is the sum of user terminal air processing machine；
S4, the pressure difference Δ P by the chilled wateractWith the pressure differential resetting value Δ P of the chilled watersetIt is compared, obtains The chilled water is obtained in the comparison result of t moment pressure difference, and obtain the freezing in corresponding moment t in conjunction with the quantity N The control model for pumping output, the operation of the refrigerating water pump is controlled according to the control model.
In central air conditioner system refrigerating water pump water-supply control of the present invention, it is preferable that the method also includes The step S1 to S4 is repeated every prefixed time interval Δ t；The prefixed time interval Δ t is 5~10 minutes.
In central air conditioner system refrigerating water pump water-supply control of the present invention, it is preferable that the step S4 is also wrapped It includes the temperature difference Δ T of the chilled wateractWith the temperature difference setting value Δ T of the chilled waterset, the chilled water is obtained in t The comparison result of the temperature difference is carved, the comparison result based on the temperature difference adjusts the water flow of the refrigerating water pump.
In central air conditioner system refrigerating water pump water-supply control of the present invention, it is preferable that the method also includes:
Before the freezing pump startup of the central air conditioner system, the refrigerating water pump main pipe is set for the temperature difference setting value of return water ΔTsetWith pressure differential resetting value Δ Pset。
In central air conditioner system refrigerating water pump water-supply control of the present invention, it is preferable that in the step S4, The control model of the refrigerating water pump output in corresponding moment t is obtained by the following formula；
Wherein,
Temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become and is pressurized poor control model.
The present invention also provides a kind of central air conditioner system refrigerating water pump water supply control apparatus, comprising:
Acquisition unit, for acquiring the supply water temperature T of freezing water conduit tube in t momentsup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd the valve of each user terminal air processing machine chilled water pipeline is opened in the central air conditioner system Spend S1, S2... Sk, K is more than or equal to 1；
First computing unit, for according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water PsupAnd pressure of return water Prtn, obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ Tact、 And pressure of return water PrtnWith pressure of supply water PsupBetween pressure difference Δ Pact；
Wherein, Δ Tact=Trtn-Tsup；
ΔPact=Prtn-Psup；
Second computing unit, for calculating the central air conditioner system each use while the first computing unit executes The valve opening S of family end air processing machine chilled water pipeline1, S2... SkIn t moment exceed threshold value quantity N, and by with Lower formula calculates the quantity N；
Wherein, n is the sum of user terminal air processing machine；
PID controller, for by the pressure difference Δ P of the chilled wateractWith the pressure differential resetting value Δ P of the chilled waterset It is compared, obtains the chilled water in the comparison result of t moment pressure difference, and obtain in conjunction with the quantity N in corresponding moment t The control model of Shi Suoshu refrigerating water pump output, the operation of the refrigerating water pump is controlled according to the control model；
The acquisition unit is connect with first computing unit, first computing unit and the PID controller point It is not connect with second computing unit.
In central air conditioner system refrigerating water pump water supply control apparatus of the present invention, it is preferable that further include:
Unit is repeated, for repeating the step S1 to S4 every prefixed time interval Δ t；When described default Between interval of delta t be 5~10 minutes.
In central air conditioner system refrigerating water pump water supply control apparatus of the present invention, it is preferable that the PID controller is also For by the temperature difference Δ T of the chilled wateractWith the temperature difference setting value Δ T of the chilled waterset, the chilled water is obtained in t The comparison result of the moment temperature difference, the comparison result based on the temperature difference adjust the water flow of the refrigerating water pump.
In central air conditioner system refrigerating water pump water supply control apparatus of the present invention, it is preferable that the method also includes:
Before the freezing pump startup of the central air conditioner system, the refrigerating water pump main pipe is set for the temperature difference setting value of return water ΔTsetWith pressure differential resetting value Δ Pset。
In central air conditioner system refrigerating water pump water supply control apparatus of the present invention, it is preferable that in the PID controller In, the control model of the refrigerating water pump output in corresponding moment t is obtained by the following formula；
Wherein,
Temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become and is pressurized poor control model.
Implement central air conditioner system refrigerating water pump water-supply control of the invention, has the advantages that of the invention Central air conditioner system refrigerating water pump water-supply control provides a kind of fast and convenient controlling party for scene freezing water supplying pump Method, this method organically combines main pipe and determines the advantage of temperature difference control and main pipe constant pressure difference control, while considering central air-conditioning The aperture situation of each valve of the air processing machine chilled water pipeline of each user terminal of system, and then according to the real-time feelings of refrigerating water pump For condition to switch the control model of chilled-water flow and set corresponding pressure differential resetting value, user terminal cooling capacity can be guaranteed by having reached It is in liberal supply, the stability, energy-saving of waterpower can be also kept, while the heat exchange that chilled water and refrigeration host computer also can be improved is imitated Rate, the final purpose for realizing Energy Saving of Central Air-conditioning stable operation.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the flow chart of central air conditioner system refrigerating water pump water-supply control of the present invention；
Fig. 2 is the functional block diagram of central air conditioner system refrigerating water pump water supply control apparatus of the present invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail A specific embodiment of the invention.
As shown in Figure 1, this method includes following step in central air conditioner system refrigerating water pump water-supply control of the invention It is rapid:
S1, in the refrigerating water pump operational process of central air conditioner system, t moment acquire freezing water conduit tube supply water temperature Tsup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd each user terminal air in the central air conditioner system The valve opening S of processor chilled water pipeline1, S2... Sk, K is more than or equal to 1.
Specifically, in step sl, t moment is a certain moment of the refrigerating water pump of central air conditioner system in the process of running, Such as can central air conditioner system booting after half an hour, a hour, one and a half hours.
Further, the supply water temperature T of freezing water conduit tube is acquired in step S1sup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd the valve of each user terminal air processing machine chilled water pipeline is opened in the central air conditioner system Spend S1, S2... SkBefore further include: before the freezing pump startup of central air conditioner system, the temperature difference of the setting freezing water conduit tube for return water Setting value Δ TsetWith pressure differential resetting value Δ Pset.The freezing water conduit tube is to freeze the confession of water conduit tube for the temperature difference setting value of return water Difference between coolant-temperature gage and return water temperature, the temperature difference setting value are refrigerating water pump supply water temperature and return water temperature in the process of running Between difference target value to be achieved.Preferably, temperature difference setting value Δ TsetPreferably 5 DEG C, pressure differential resetting value Δ Pset is excellent It is selected as 0.3MPa.It is to be appreciated that freezing water conduit tube supply backwater temperature difference setting value and can lead to for the pressure differential resetting value of pressure of return water It crosses to operate on the operation panel of central air conditioner system and realize, the set-up mode is convenient, simple to operation, very convenient for management.
In the present embodiment, each user terminal air processing machine chilled water pipeline is central air-conditioning in central air conditioner system The chilled water of each user's air processing machine is for return pipe in system；Valve opening S1, S2... SkIt is primarily referred to as proportional integration valve The aperture of door, usual valve opening are generally 0%~100%.In other words, central air conditioner system collected in the present embodiment In each user terminal air processing machine chilled water pipeline the air processing machine of each floor of building that refers specifically to of valve opening Chilled water pipeline valve aperture, for example, one building in have 16 layers, then need acquisition chilled water pipeline valve opening have Total S1, S2... S1616 data need to acquire S in t moment1, S2... S1616 data.
S2, according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water PsupAnd pressure of return water Prtn, obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ TactAnd pressure of return water PrtnWith Pressure of supply water PsupBetween pressure difference Δ Pact；
Wherein, Δ Tact=Trtn-Tsup；
ΔPact=Prtn-Psup。
In this step, Δ TactTo freeze the supply water temperature of water conduit tube and the difference of return water temperature, reflection in t moment Be freeze water conduit tube supply water temperature and return water temperature t moment real time temperature, therefore, Δ TactReflection is freezing The real-time temperature difference of the water conduit tube in t moment.
S3, the step S2 execute while, it is cold to calculate each user terminal air processing machine of the central air conditioner system Freeze the valve opening S of water lines1, S2... SkIn in t moment exceed the quantity N of threshold value, and the number is calculated by the following formula Measure N；
Wherein, n is the sum of user terminal air processing machine.
It is to be appreciated that in the present embodiment, quantity N be in central air conditioner system each user terminal air processing machine it is cold Freeze the valve opening S of water lines1, S2... SkIn i.e. K valve opening data in beyond threshold value number.Preferably, valve The threshold value of aperture can be 95%.Exceed 95% number i.e. in the data of K valve opening, such as beyond in K data Beyond 95% number a total of 1, then N is 1；If there is 2, then N is 2.
S4, the pressure difference Δ P by the chilled wateractWith the pressure differential resetting value Δ P of the chilled watersetIt is compared, obtains The chilled water is obtained in the comparison result of t moment pressure difference, and obtain the freezing in corresponding moment t in conjunction with the quantity N The control model for pumping output, the operation of the refrigerating water pump is controlled according to the control model.
Above-mentioned steps S1 to S4 is carried out in refrigerating water pump operational process.
Preferably, in the present embodiment, step S1 to S4 is repeated every prefixed time interval Δ t；Between preset time Every Δ t be 5~10 minutes.Such as 5 minutes, 10 minutes.For example, in the data of acquisition in first time time interval 5 minutes, and hold Row step S1 to step S4 obtains the control model that the refrigerating water pump at the moment exports, and according to control model control obtained The operation of fine frozen pump, and then achieve the purpose that control central air conditioner system operation, it is final to realize that Energy Saving of Central Air-conditioning is steady Surely the purpose run.
It preferably, in step s 4 further include by the temperature difference Δ T of chilled wateractWith the temperature difference setting value of the chilled water ΔTset, the chilled water is obtained in the comparison result of the t moment temperature difference, and the comparison result based on the temperature difference adjusts the freezing The water flow of pump.
Further, in step s 4, the control of the refrigerating water pump output in corresponding moment t is obtained by the following formula Molding formula；
Wherein,
Temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become and is pressurized poor control model.Tool Body, by above equation, as the valve opening S of the air processing machine chilled water pipeline of each user terminal of central air conditioner systemkGreatly In or equal to 95% number N be less than or equal to 1 when, temperature difference control model is determined using main pipe；As each user of central air conditioner system The valve opening S of the air processing machine chilled water pipeline at endkWhen number N more than or equal to 95% is greater than or equal to 2, using dry Pipe constant pressure difference control mode.
It is to be appreciated that in the present embodiment, main pipe determines the control model of the temperature difference i.e. are as follows: when chilled water supply backwater temperature difference Δ TactLess than temperature difference setting value Δ TsetWhen, so that refrigerating water pump is slowed down by the control of PID controller 40 and reduces water flow；Work as freezing Water supply backwater temperature difference Δ TactGreater than temperature difference setting value Δ TsetWhen, make refrigerating water pump accelerate to increase by the control of PID controller 40 Add water flow.The control model of main pipe level pressure difference is are as follows: when chilled water is for return water pressure differential deltap PactLess than pressure differential resetting value Δ Pset When, the control of PID controller 40 makes refrigerating water pump accelerate to increase pressure of supply water；When chilled water is for return water pressure differential deltap PactIt is set greater than pressure difference Definite value Δ PsetWhen, the control of PID controller 40, which makes refrigerating water pump slow down, reduces pressure of supply water.
For example, when the control model of the output of the refrigerating water pump determined by t moment is that main pipe determines the control model of the temperature difference, if Chilled water supply backwater temperature difference Δ TactLess than temperature difference setting value Δ TsetWhen, by PID controller 40 control make refrigerating water pump slow down into And reduce water flow；Make refrigerating water pump slow down by PID controller 40 to reduce the water flow of current (t moment) chilled water, pass through It is usually that 10% is reduced on the basis of current water flow according to existing experience, specific calculation formula is as follows:
Mset, MactRespectively indicate chilled water setting target water flow and current water flow.
If chilled water supply backwater temperature difference Δ TactGreater than temperature difference setting value Δ Tset, then increase on the basis of current water flow 10% water flow, and then reach the condition for adjusting refrigerating water pump output, make chilled water supply backwater temperature difference Δ TactReach setting value Δ Tset。
If chilled water is for return water pressure differential deltap PactLess than pressure differential resetting value Δ PsetWhen, the control of PID controller 40 makes refrigerating water pump Accelerate to increase pressure of supply water；I.e. PID controller 40, which controls refrigerating water pump, accelerates refrigerating water pump, and increases on the basis of current pressure 10%, setting value is reached to improve chilled water for return water pressure difference.If chilled water is for return water pressure differential deltap PactGreater than pressure differential resetting It is worth Δ PsetWhen, the control of PID controller 40, which makes refrigerating water pump slow down, reduces pressure of supply water；I.e. the control of PID controller 40 refrigerating water pump makes cold Freeze pump to accelerate, and reduce 10% on the basis of current pressure, reaches setting value to reduce chilled water for return water pressure difference.And For PC+Become and increase pressure differential control type, is on the basis of PC constant pressure difference control mode, whenever condition meets Δ Pact≥Δ Pset, when N >=2, Δ Pset control model increases by 10%, i.e. Δ P on the basis of originalN set=(1+10%) Δ PO set, wherein ΔPO set, Δ PN setRespectively indicate old (Old) pressure differential resetting value and new (New) pressure differential resetting value.
Central air conditioner system refrigerating water pump water-supply control of the invention provides a kind of fast and convenient for Spot Cooling Freeze the control method of water supplying pump, this method organically combines the advantage that main pipe determines temperature difference control and main pipe constant pressure difference control, together When consider each user terminal of central air conditioner system air processing machine chilled water pipeline each valve aperture situation, in turn According to the real-time condition of refrigerating water pump to switch the control model of chilled-water flow and set corresponding pressure differential resetting value, reach i.e. Can guarantee that user terminal cooling capacity is in liberal supply, can also keep the stability, energy-saving of waterpower, at the same also can be improved chilled water with The heat exchange efficiency of refrigeration host computer, the final purpose for realizing Energy Saving of Central Air-conditioning stable operation.
As shown in Fig. 2, central air conditioner system refrigerating water pump water supply control apparatus of the invention, including acquisition unit 10, first Computing unit 20, the second computing unit 30 and PID controller 40.Acquisition unit 10 is connect with the first computing unit 20, and first Computing unit 20 and PID controller 40 are connect with the second computing unit 30 respectively.
Specifically, acquisition unit 10 is used in the refrigerating water pump operational process of central air conditioner system, is acquired and is freezed in t moment The supply water temperature T of water conduit tubesup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd the central air conditioner system In each user terminal air processing machine chilled water pipeline valve opening S1, S2... Sk, K is more than or equal to 1.
Specifically, in acquisition unit 10, t moment is certain a period of time of the refrigerating water pump of central air conditioner system in the process of running Carve, such as can central air conditioner system booting after half an hour, a hour, one and a half hours.
Further, the supply water temperature T of freezing water conduit tube is acquired in acquisition unit 10sup, return water temperature Trtn, pressure of supply water Psup, pressure of return water PrtnAnd the valve of each user terminal air processing machine chilled water pipeline is opened in the central air conditioner system Spend S1, S2... SkBefore further include: before the freezing pump startup of central air conditioner system, the temperature difference of the setting freezing water conduit tube for return water Setting value Δ TsetWith pressure differential resetting value Δ Pset.The freezing water conduit tube is to freeze the confession of water conduit tube for the temperature difference setting value of return water Difference between coolant-temperature gage and return water temperature, the temperature difference setting value are refrigerating water pump supply water temperature and return water temperature in the process of running Between difference target value to be achieved.Preferably, temperature difference setting value Δ TsetPreferably 5 DEG C, pressure differential resetting value Δ Pset is excellent It is selected as 0.3MPa.It is to be appreciated that freezing water conduit tube supply backwater temperature difference setting value and can lead to for the pressure differential resetting value of pressure of return water It crosses to operate on the operation panel of central air conditioner system and realize, the set-up mode is convenient, simple to operation, very convenient for management.
In the present embodiment, the chilled water pipeline of each user terminal air processing machine is central hollow in central air conditioner system The chilled water of each user's air processing machine is for return pipe in adjusting system；Valve opening S1, S2... SkIt is primarily referred to as proportional integration The aperture of valve, usual valve opening are generally 0%~100%.In other words, central air-conditioning system collected in the present embodiment The air-treatment for each floor of building that the valve opening of the chilled water pipeline of each user terminal air processing machine refers specifically in system The aperture of the valve of the chilled water pipeline of machine then needs the valve opening of acquisition chilled water pipeline for example, having 16 layers in a building There is total S1, S2... S1616 data need to acquire S in t moment1, S2... S1616 data.
First computing unit 20, for according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water PsupAnd pressure of return water Prtn, obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ Tact、 And pressure of return water PrtnWith pressure of supply water PsupBetween pressure difference Δ Pact；
Wherein, Δ Tact=Trtn-Tsup；
ΔPact=Prtn-Psup。
In the first computing unit 20, Δ TactTo freeze the supply water temperature of water conduit tube and the difference of return water temperature in t moment Value, reflection be freeze water conduit tube supply water temperature and return water temperature t moment real time temperature, therefore, Δ TactReflection It is to freeze water conduit tube in the real-time temperature difference of t moment.
Second computing unit 30, for calculating the central air conditioner system while the first computing unit is executed and calculated The valve opening S of each user terminal air processing machine chilled water pipeline1, S2... SkIn t moment exceed threshold value quantity N, and The quantity N is calculated by the following formula；
Wherein, n is the sum of user terminal air processing machine.
It is to be appreciated that in the present embodiment, quantity N be in central air conditioner system each user terminal air processing machine it is cold Freeze the valve opening S of water lines1, S2... SkIn i.e. K valve opening data in beyond threshold value number.Preferably, valve The threshold value of aperture can be 95%.Exceed 95% number i.e. in the data of K valve opening, such as beyond in K data Beyond 95% number a total of 1, then N is 1；If there is 2, then N is 2.
PID controller 40, for by the pressure difference Δ P of the chilled wateractWith the pressure differential resetting value Δ of the chilled water PsetIt is compared, obtains the chilled water in the comparison result of t moment pressure difference, and obtained when corresponding in conjunction with the quantity N The control model for carving refrigerating water pump output when t, the operation of the refrigerating water pump is controlled according to the control model.
Preferably, in the present embodiment, every prefixed time interval Δ t acquisition unit 10, the first computing unit 20, second It is primary that computing unit 30 and PID controller 40 are repeated in execution.Prefixed time interval Δ t is 5~10 minutes.Such as 5 minutes, 10 minutes etc..For example, in the data of acquisition in first time time interval 5 minutes, and execute acquisition unit 10, the first computing unit 20, the second computing unit 30 and PID controller 40 obtain the control model that the refrigerating water pump at the moment exports, and according to institute The operation of the control model control refrigerating water pump of acquisition, and then achieve the purpose that control central air conditioner system operation, finally in realization Entreat the purpose of air conditioner system energy saving stable operation.
It preferably, further include by the temperature difference Δ T of chilled water in PID controller 40actIt is set with the temperature difference of the chilled water Definite value Δ Tset, the chilled water is obtained in the comparison result of the t moment temperature difference, described in the comparison result adjusting based on the temperature difference The water flow of refrigerating water pump.
Further, in PID controller 40, it is defeated that the refrigerating water pump in corresponding moment t is obtained by the following formula Control model out；
Wherein, temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become pressurization difference control mould Formula.Specifically, by above equation, when the valve opening of the air processing machine chilled water pipeline of each user terminal of central air conditioner system SkWhen number N more than or equal to 95% is less than or equal to 1, temperature difference control model is determined using main pipe；When central air conditioner system is each The valve opening S of the air processing machine chilled water pipeline of user terminalkWhen number N more than or equal to 95% is greater than or equal to 2, adopt With main pipe constant pressure difference control mode.
It is to be appreciated that in the present embodiment, main pipe determines the control model of the temperature difference i.e. are as follows: when chilled water supply backwater temperature difference Δ TactLess than temperature difference setting value Δ TsetWhen, so that refrigerating water pump is slowed down by the control of PID controller 40 and reduces water flow；Work as freezing Water supply backwater temperature difference Δ TactGreater than temperature difference setting value Δ TsetWhen, make refrigerating water pump accelerate to increase by the control of PID controller 40 Add water flow.The control model of main pipe level pressure difference is are as follows: when chilled water is for return water pressure differential deltap PactLess than pressure differential resetting value Δ Pset When, the control of PID controller 40 makes refrigerating water pump accelerate to increase pressure of supply water；When chilled water is for return water pressure differential deltap PactIt is set greater than pressure difference Definite value Δ PsetWhen, the control of PID controller 40, which makes refrigerating water pump slow down, reduces pressure of supply water.
For example, when the control model of the output of the refrigerating water pump determined by t moment is that main pipe determines the control model of the temperature difference, if Chilled water supply backwater temperature difference Δ TactLess than temperature difference setting value Δ TsetWhen, by PID controller 40 control make refrigerating water pump slow down into And reduce water flow；Make refrigerating water pump slow down by PID controller 40 to reduce the water flow of current (t moment) chilled water, pass through It is usually that 10% is reduced on the basis of current water flow according to existing experience, specific calculation formula is as follows:
Mset, MactRespectively indicate chilled water setting target water flow and current water flow.
If chilled water supply backwater temperature difference Δ TactGreater than temperature difference setting value Δ Tset, then increase on the basis of current water flow 10% water flow, and then reach the condition for adjusting refrigerating water pump output, make chilled water supply backwater temperature difference Δ TactReach setting value Δ Tset。
If chilled water is for return water pressure differential deltap PactLess than pressure differential resetting value Δ PsetWhen, the control of PID controller 40 makes refrigerating water pump Accelerate to increase pressure of supply water；I.e. PID controller 40, which controls refrigerating water pump, accelerates refrigerating water pump, and increases on the basis of current pressure 10%, setting value is reached to improve chilled water for return water pressure difference.If chilled water is for return water pressure differential deltap PactGreater than pressure differential resetting It is worth Δ PsetWhen, the control of PID controller 40, which makes refrigerating water pump slow down, reduces pressure of supply water；I.e. the control of PID controller 40 refrigerating water pump makes cold Freeze pump to accelerate, and reduce 10% on the basis of current pressure, reaches setting value to reduce chilled water for return water pressure difference.And For PC+Become and increase pressure differential control type, is on the basis of PC constant pressure difference control mode, whenever condition meets Δ Pact≥Δ Pset, when N >=2, Δ Pset control model increases by 10%, i.e. Δ P on the basis of originalN set=(1+10%) Δ PO set, wherein ΔPO set, Δ PN setRespectively indicate old (Old) pressure differential resetting value and new (New) pressure differential resetting value.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (10)

1. a kind of central air conditioner system refrigerating water pump water-supply control, which comprises the following steps:
S1, in the refrigerating water pump operational process of central air conditioner system, t moment acquire freezing water conduit tube supply water temperature Tsup, return Coolant-temperature gage Trtn, pressure of supply water Psup, pressure of return water PrtnAnd each user terminal air processing machine in the central air conditioner system The valve opening S of chilled water pipeline1, S2... Sk, K is more than or equal to 1；
S2, according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water PsupAnd pressure of return water Prtn, Obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ TactAnd pressure of return water PrtnWith water supply Pressure PsupBetween pressure difference Δ Pact；
Wherein, △ Tact=Trtn-Tsup；
△Pact=Prtn-Psup；
S3, the step S2 execute while, calculate each user terminal air processing machine chilled water of the central air conditioner system The valve opening S of pipeline1, S2... SkIn in t moment exceed the quantity N of threshold value, and the quantity N is calculated by the following formula；
Wherein, n is the sum of user terminal air processing machine；
S4, the pressure difference Δ P by the chilled wateractWith the pressure differential resetting value Δ P of the chilled watersetIt is compared, obtains institute Chilled water is stated in the comparison result of t moment pressure difference, and defeated in conjunction with quantity N acquisition refrigerating water pump in corresponding moment t Control model out controls the operation of the refrigerating water pump according to the control model.
2. central air conditioner system refrigerating water pump water-supply control according to claim 1, which is characterized in that the method is also Including repeating the step S1 to S4 every prefixed time interval △ t；The prefixed time interval △ t is 5~10 minutes.
3. central air conditioner system refrigerating water pump water-supply control according to claim 1, which is characterized in that the step S4 It further include by the temperature difference Δ T of the chilled wateractWith the temperature difference setting value Δ T of the chilled waterset, obtain the chilled water and exist The comparison result of the t moment temperature difference, the comparison result based on the temperature difference adjust the water flow of the refrigerating water pump.
4. central air conditioner system refrigerating water pump water-supply control according to claim 1, which is characterized in that the method is also Include:
Before the freezing pump startup of the central air conditioner system, the refrigerating water pump main pipe is set for the temperature difference setting value Δ of return water TsetWith pressure differential resetting value Δ Pset。
5. central air conditioner system refrigerating water pump water-supply control according to claim 1, which is characterized in that in the step In S4, the control model of the refrigerating water pump output in corresponding moment t is obtained by the following formula；
Wherein, temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become and is pressurized poor control model.
6. a kind of central air conditioner system refrigerating water pump water supply control apparatus characterized by comprising
Acquisition unit, for acquiring the supply water temperature T of freezing water conduit tube in t momentsup, return water temperature Trtn, pressure of supply water Psup、 Pressure of return water PrtnAnd in the central air conditioner system each user terminal air processing machine chilled water pipeline valve opening S1, S2... Sk, K is more than or equal to 1；
First computing unit, for according to chilled water supply water temperature T collectedsup, return water temperature Trtn, pressure of supply water Psup, with And pressure of return water Prtn, obtain the chilled water return water temperature TrtnWith supply water temperature TsupBetween temperature difference Δ TactAnd it returns Water pressure PrtnWith pressure of supply water PsupBetween pressure difference Δ Pact；
Wherein, △ Tact=Trtn-Tsup；
△Pact=Prtn-Psup；
Second computing unit, for calculating the central air conditioner system each user terminal while the first computing unit executes The valve opening S of air processing machine chilled water pipeline1, S2... SkIn in t moment exceed the quantity N of threshold value, and pass through following formula Son calculates the quantity N；
Wherein, n is the sum of user terminal air processing machine；
PID controller, for by the pressure difference Δ P of the chilled wateractWith the pressure differential resetting value Δ P of the chilled watersetIt carries out Compare, obtain the chilled water in the comparison result of t moment pressure difference, and obtains in conjunction with the quantity N in corresponding moment t when institute The control model for stating refrigerating water pump output, the operation of the refrigerating water pump is controlled according to the control model；
The acquisition unit is connect with first computing unit, first computing unit and the PID controller respectively with The second computing unit connection.
7. central air conditioner system refrigerating water pump water supply control apparatus according to claim 6, which is characterized in that further include:
Unit is repeated, for repeating the step S1 to S4 every prefixed time interval △ t；Between the preset time Every △ t be 5~10 minutes.
8. central air conditioner system refrigerating water pump water supply control apparatus according to claim 6, which is characterized in that the PID control Device processed is also used to the temperature difference Δ T of the chilled wateractWith the temperature difference setting value Δ T of the chilled waterset, obtain the freezing For water in the comparison result of the t moment temperature difference, the comparison result based on the temperature difference adjusts the water flow of the refrigerating water pump.
9. central air conditioner system refrigerating water pump water supply control apparatus according to claim 6, which is characterized in that further include:
Before the freezing pump startup of the central air conditioner system, the refrigerating water pump main pipe is set for the temperature difference setting value Δ of return water TsetWith pressure differential resetting value Δ Pset。
10. central air conditioner system refrigerating water pump water supply control apparatus according to claim 6, wherein being characterized in that, described In PID controller, the control model of the refrigerating water pump output in corresponding moment t is obtained by the following formula；
Wherein, temperature difference control model is determined in TC expression, and PC indicates constant pressure difference control mode；PC+It indicates to become and is pressurized poor control model.
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