CN105020822B - Suitable for the change differential pressure control system of air-conditioning Variable flow system - Google Patents
Suitable for the change differential pressure control system of air-conditioning Variable flow system Download PDFInfo
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- CN105020822B CN105020822B CN201510464559.4A CN201510464559A CN105020822B CN 105020822 B CN105020822 B CN 105020822B CN 201510464559 A CN201510464559 A CN 201510464559A CN 105020822 B CN105020822 B CN 105020822B
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- cold water
- air
- differential pressure
- water temperature
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Classifications
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
Abstract
The present invention provides the change differential pressure control system suitable for air-conditioning Variable flow system, is related to refrigeration control field, is invented to improve accuracy, reduction energy consumption and safe and stable operation when cold power and hydraulic balancing regulation.The change differential pressure control system includes cold output control device, primary pump frequency-converting control device and cold water Minimum Flow Control device, and cold output control device carries out Power Control according to cold water, return water temperature and cold water flow to cold device；Primary pump frequency-converting control device, equivalent valve seat opening value for calculating fan coil, according to all air conditioning terminal cold valves valve seat opening values of air-conditioning system, cold water temperature, cold water flow and confession backwater differential pressure, VFC is carried out to primary pump, cold water Minimum Flow Control device, balance pipe return valve is controlled according to cold water flow, cold Power Control and frequency conversion control technique of the present invention for air-conditioning system.
Description
Technical field
The present invention relates to handpiece Water Chilling Units control field, more particularly to a kind of variation suitable for air-conditioning Variable flow system are voltage-controlled
System processed.
Background technology
At present, a part of handpiece Water Chilling Units, particularly Large Central Air Conditioning System system use one-level variable frequency pump.
This is because, as shown in figure 1, traditional Variable flow system is as follows：Including water chilling unit system (i.e. cold device),
One-level pump group, supply channel and water return pipeline, wherein, supply channel includes water main 5 and is arranged in parallel on water main 5
Multiple water supply pipes 2, water return pipeline includes return main 6 and multiple backwater for being arranged in parallel on return main 6 are in charge of 3,
Water chilling unit system includes the multiple handpiece Water Chilling Units 1 being arranged in parallel, and water main 5 includes multiple water supply pipes 2, and return main 6
It is in charge of 3 including multiple backwater, one-level pump group includes the multiple pumps 4 being arranged in parallel, the outlet pipe and primary pump of water chilling unit system
The water inlet pipe of group is connected, and the outlet pipe of one-level pump group is aggregated into water main 5 and is connected with water supply pipe 2, and by sharp after user
It is in charge of 3 with backwater and 3 return mains 6 collected are in charge of by backwater are back to water chilling unit system and recycles.
Different from general pump, water flow can be adjusted for the one-level variable frequency pump used within air-conditioning systems, realize
Adjustment of the cold water delivery needle to air conditioner load.
At present, for suitable for the change differential pressure control system of air-conditioning Variable flow system, energy consumption wave is overcome in order to real
Take, at least need to start with terms of the adjustment of cold power and cold water convey two, realize that the cold equilibrium of supply and demand and hydraulic equilibrium are
Most basic requirement, the technology for having two aspects at present, one is based on for backwater pressure difference using definite value or change setting value single loop
Feedback control technology adjusts the rotating speed of one-level variable frequency pump, implements cold water conveying control, realizes cold supply and air conditioner load
It is effectively matched；Two be constant water outlet temperature setting value, using single loop feedback control technology to cold power with return water temperature
Change is automatically adjusted.
In the adjustment of existing cold power with cold water conveying control technology, cold water temperature, for backwater differential pressure using single loop
Feedback control, often have ignored the unit in underload and there is the limitation of cold minimum discharge and protection problem, and in high load capacity
Cold water-out temperature is possible to occur to transfinite can not meet requirement of the air conditioning terminal to the matter of cold water in runaway condition；Together
When, using single loop feedback control, only wait until that controller can just be intervened after controlled Parameters variation, regulation exists delayed
Property, this control method can undoubtedly influence the stability of technological parameter, and be existed in cold and central air conditioner system various
Interference, the change of such as cold water flow, return water temperature can have considerable influence, the fluctuation of system pressure to the change of cold leaving water temperature
Also influence whether the change of cold water flow and then influence to supply backwater differential pressure, simply can not effectively solve work by single loop feedback control
The problem of skill parametric stability, can also hidden danger be brought to the security of system operation.
In addition, also there is the place of its irrationality using setting control for backwater differential pressure, differential pressure setpoint is excessive, exists cold
The excessive energy waste problem of water conveying energy；And it is too small, there are semen donors and just have in some heating power least favorable loops of air-conditioning system
Not enough the problem of, it is impossible to meet comfort level requirement.
Further, in having become for backwater differential pressure setpoint control technology, cold valves can only be adapted to and belong to continuously adjustabe
The occasion of air conditioning terminal, but the occasion containing fan coil air-conditioner type in air-conditioning system can not be handled.
In summary, in above-mentioned existing cold power adjustment conveys the load adjustment technology of control air-conditioning with cold water, on
State technology exist cold power and cold water conveying hydraulic balancing regulation accuracy it is not good, security and stability difference and be difficult to meet
The problem of least favorable loop comfort level is required.
The content of the invention
In view of this, it is an object of the invention to provide a kind of voltage-controlled system system of variation suitable for air-conditioning Variable flow system
System, for ensuring accuracy when cold power and hydraulic balancing regulation, and then energy-saving, safe and stable operation, can
Enough it is applied to complicated applications occasion.
To achieve the above object, there is provided a kind of change differential pressure suitable for air-conditioning Variable flow system for the first aspect of the present invention
Control system, including cold device, be connected to the cold device delivery port supply channel, be connected to the cold device
The water return pipeline of water inlet, the air-conditioning system that is arranged between the supply channel and the water return pipeline and with the sky
The balance pipeline that adjusting system is arranged in parallel；
Wherein, the air-conditioning system includes one or more air conditioning terminals in parallel, and air conditioning terminal is to include fan coil
Polytype inside；The water return pipeline, which is provided with, is used for the primary pump to cold device backwater；
The control system also includes：
Cold output control device, the backwater temperature for the cold water temperature according to the supply channel, the water return pipeline
The cold water flow of degree and the cold device, Power Control is carried out to the cold device；
Primary pump frequency-converting control device, the equivalent valve seat opening value for calculating the fan coil, according to the air-conditioning
All air conditioning terminal cold valves valve seat opening values of system, the cold water temperature of the supply channel, the cold water stream of the cold device
The confession backwater differential pressure of amount and the air-conditioning system, VFC is carried out to the primary pump；
Cold water Minimum Flow Control device, according to the cold water flow of the cold device to the return valve on the balance pipe
It is controlled.
In the first possible implementation of the first aspect of the present invention,
The cold output control device includes：
Cold water temperature measurement table, is arranged on the supply channel, measures the cold water temperature of the supply channel；
Return water temperature measurement table, is arranged on the water return pipeline, measures the return water temperature of the water return pipeline；
Cold water flow measurement table, is arranged at the cold device, measures the cold water flow of the cold device；
Return water temperature feedforward controller, the backwater temperature of the water return pipeline according to measured by the return water temperature measurement table
Degree, calculates and exports the first power control signal；
Cold water flow feedforward controller, the cold water stream of the cold device according to measured by the cold water flow measurement table
Amount, calculates and exports the second power control signal；
Cold water temperature controller, the cold water temperature of the supply channel according to measured by the cold water temperature measurement table,
Calculate and export the 3rd power control signal；
Adder, to described first, second and second power control signal sum, regard the value after summation as work(
Rate control signal is exported.
The first with reference to the first aspect of the present invention or the first aspect of the present invention is possible, in the first aspect of the present invention
Second of possible implementation in, the primary pump frequency-converting control device includes：
The equivalent valve seat opening computing unit of fan coil, the equivalent valve seat opening value for calculating the fan coil；
Maximum value signal selector, receives the equivalent valve position that the equivalent valve seat opening computing unit of fan coil is calculated
The cold valves aperture value of other air-conditionings in opening value, and air-conditioning system in addition to fan coil, selects the equivalent valve position
Opening value and the maximum in the cold valves aperture value, are used as valve seat opening signal output；
Cold water temperature measurement table, is arranged on the supply channel, measures the cold water temperature of the supply channel；
Water flow temperature transfinites controller, for the cold water temperature measured according to the cold water temperature measurement table, calculates simultaneously defeated
Go out the first frequency change control signal；
Cold valves valve positioner, the valve seat opening signal exported according to the maximum value signal selector is calculated and defeated
Go out to supply backwater differential pressure setpoint signal；
For backwater differential pressure measurement unit, the confession backwater differential pressure for measuring the air-conditioning system；
For backwater differential pressure controller, the confession backwater differential pressure setpoint signal exported according to the cold valves valve positioner,
And the confession backwater differential pressure value measured by the confession backwater differential pressure computing unit, calculate and export for backwater differential pressure control signal；
Cold water flow measurement table, is arranged at the cold device, measures the cold water flow of the cold device；
Cold water flow controller, the confession backwater differential pressure control signal exported according to the confession backwater differential pressure controller is as cold
Cold water flow measured by the setting value of water flow controller and the cold water flow measurement table, is calculated and output flow control
Signal；
Frequency conversion Staged cotrol device, the flow control signal exported according to the cold water flow controller calculates output second
Frequency change control signal；
The low selector of signal, select the water flow temperature transfinite controller output the first frequency change control signal and the change
The low signal of signal value, is exported as primary pump control signal in second frequency change control signal of frequency division range controller output；
One-level pump controller, the primary pump control signal exported according to the low selector of the signal, enters to the primary pump
Row VFC.
Second with reference to the first aspect of the present invention is possible, in the third possible realization of the first aspect of the present invention
In mode, cold water Minimum Flow Control device includes, and flow back Staged cotrol device, the stream exported according to the cold water flow controller
Control signal is measured, the control signal of the return valve on the balance pipeline is calculated and export.
Change differential pressure control system provided in an embodiment of the present invention suitable for air-conditioning Variable flow system, because cold water temperature is
Realized by adjusting cold power, only when cold power and air conditioning terminal customer charge match, cold water temperature is
Can stablize, and the change of cold water flow, return water temperature be reflect air conditioning terminal load variations Direct Variable, with cold water flow,
Return water temperature substantially increases the promptness of cold power adjustment, cold water temperature is using more as the feed forward variable of load adjustment
Variable feedforward and feedback control strategy can effectively stablize cold water temperature, meet requirement of the air-conditioning system to the matter of cold water, compensate for
The lagging influence that traditional cold water temperature single loop feedback control strategy is brought.
Serials control is used for backwater differential pressure and cold water flow, can be eliminated as system pressure change is exerted oneself to water supply pump
Influence, and then reach the purpose improved for backwater differential pressure stability.
, can volitional check lifting when cold water temperature overtemperature because cold water flow and cold water temperature are using selection control strategy
Water supply pump frequency conversion rotating speed, generally under high loads, prevents that cold water temperature is in runaway condition when cold water flow is excessive, it is impossible to meet
Requirement of the air conditioning terminal to the matter of cold water.
And in underload, the cool water quantity needed for air-conditioning system is reduced, to prevent the flow under extreme case by cold
Too small to cause cold safe operation problem, cold water pump frequency conversion uses Staged cotrol technology with balance pipe return valve, when water supply pump most
When the slow-speed of revolution can not ensure water-carrying capacity minimum value, by adjusting on balance pipe return valve to ensure the minimum current by cold
Amount.
Its etc. is calculated by the equivalent valve seat opening computing unit of the fan coil being arranged on fan coil on this basis
Valve seat opening value is imitated, so that the measurement of the valve seat opening under complicated applications occasion is further solved the problems, such as, according to air-conditioning system
In all air conditioning terminals cold valves position in maximum and be allowed to operate in a high-value, one can be obtained and reasonably supplied back
Water differential pressure setpoint, ensure that least favorable loop is conveyed to the demand and simultaneously minimum cold water of energy in air-conditioning system
Can, effectively establish cold water conveying and the equilibrium of supply and demand of air conditioner load；
Can thus be realized according to the present invention can quickly adjust according to the change of air conditioner load so that handpiece Water Chilling Units power,
Meet supply and demand energy balance；, by adjusting cold water frequency conversion revolution speed in time, it can realize that cold water is defeated according to the change of air conditioner load
Send energy consumption minimum, while ensure that in high load capacity, meet requirement and underload of the air-conditioning system to the matter of cold water temperature
The safety assurance of Shi Liujing handpiece Water Chilling Units cold water minimum discharges, simultaneously, backwater pressure differential resetting value strategy is supplied by changing, protected
Least favorable loop in air-conditioning system has been demonstrate,proved to the demand of energy and cold water conveying energy consumption is further reduced.
Brief description of the drawings
The schematic diagram for the air-conditioning Variable flow system that Fig. 1 provides for prior art；
Fig. 2 is the general frame schematic diagram suitable for air-conditioning Variable flow system of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the change differential pressure control system for being applied to air-conditioning Variable flow system of the embodiment of the present invention；
Fig. 4 is the schematic diagrames of the cold output control device C10a of control system shown in Fig. 3 in systems；
Fig. 5 is the primary pump frequency-converting control device C10b and cold water Minimum Flow Control device of control system shown in Fig. 3
The schematic diagrames of C10c in systems；
Fig. 6 is the cold output control device C10a of the control system of embodiment of the present invention principle explanatory diagram；
Fig. 7 is the primary pump frequency-converting control device C10b and cold water Minimum Flow Control of the control system of the embodiment of the present invention
Device C10c principle explanatory diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
First, the embodiment of the present invention provides a kind of change differential pressure control system suitable for air-conditioning Variable flow system.Lead to below
Specific embodiment is crossed to carry out in detail the change differential pressure control system provided in an embodiment of the present invention suitable for air-conditioning Variable flow system
Describe in detail bright.
In the one-level variable frequency pump as prior art that such as background technology is proposed, cold power adjustment technology due to
Using single loop feedback control, there is hysteresis quality in the adjustment of cold power；So if passing through the permanent cold water temperature in background technology
Single loop feedback cold power adjustment technology is controlled, then controls quality to be difficult to ensure that.And to existing cold water pump frequency conversion control
Technology processed, due to not accounting for air-conditioning system the problem of high and low load may bring operation, can not meet pair in high load capacity
The requirement of cold water temperature matter, and the safe operation that can not be met in underload caused by the requirement of cold minimum discharge is asked
Topic；In addition, being preferably the energy requirement and water supply pump that disclosure satisfy that heating power least favorable loop in air-conditioning system for backwater differential pressure
Conveying energy consumption it is minimum, regrettably, for the air-conditioning system containing the multi-type air conditioner end including fan coil, this is
There is the problem of change can not be solved effectively for backwater differential pressure technology.
The cardinal principle of the embodiment of the present invention is, provided in an embodiment of the present invention suitable for air-conditioning Variable flow system
Become differential pressure control system, implement the timely quick adjustment of cold power according to cold water temperature, return water temperature and cold water flow；And
According further to the equivalent aperture of designed fan coil cold valves, in face of the hybrid air-conditioning system with fan coil system
During system, find suitable for backwater differential pressure according to the valve opening in heating power least favorable loop, and and then adjustment one-level pump variable frequency
Rotating speed, on the basis of idle call energy demand is met, Optimum Hydraulic balance reduces cold water pipe resistance and then reduces cold water conveying
Can, reach realize energy-conservation purpose, while when can take into account high load capacity cold water temperature matter requirement, cold is to cold water during underload
The safety requirements of flow minimum, enables to adapt to the service requirement of complicated applications occasion.
Specifically, for the problems of above-mentioned background technology, the embodiment of the present invention provides a kind of suitable for air-conditioning
The change differential pressure control system of Variable flow system, as shown in Figures 2 and 3, including cold device 10, is connected to going out for cold device 10
The supply channel L1 at the mouth of a river, be connected to cold device 10 water inlet water return pipeline L2, be arranged on supply channel L1 and backwater
Air-conditioning system 20 between pipeline L2 and the balance pipeline L4 being arranged in parallel with the air-conditioning system.
Wherein, air-conditioning system 20 can include one or more air conditioning terminals in parallel, and air conditioning terminal is to include fan unit
Polytype including pipe；Water return pipeline L2, which is provided with, is used for the primary pump P10 to the backwater of cold device 10.
Control system also includes：
Cold output control device C10a, the backwater temperature for the cold water temperature according to supply channel L1, water return pipeline L2
The cold water flow of degree and cold device 10, Power Control is carried out to cold device 10.
Primary pump frequency-converting control device C10b, the equivalent valve seat opening value for calculating fan coil, according to air-conditioning system
In the cold valves valve seat opening values of all air conditioning terminals, supply channel L1 cold water temperature, cold device 10 cold water flow with
And the confession backwater differential pressure of air-conditioning system 20, P10 VFC is carried out to primary pump.
Cold water Minimum Flow Control device C10c, for according to cold water flow, being carried out to the return valve U on balance pipeline L4
Control.
The course of work to the above embodiment of the present invention is briefly explained below.Cold device 10 is primary pump P10's
Under VFC, current are supplied to supply channel L1, current flow through supply channel L1 and supplied to the branch road L3 of air-conditioning system,
And finally flow back to cold device 10 via water return pipeline L2.Here, primary pump frequency-converting control device C10b can be to air-conditioning system 20
In each fan coil carry out the simulation of valve seat opening and calculate, obtain the equivalent of cold valves aperture equivalent to other types air-conditioning
Valve seat opening value, so that the equivalent valve seat opening value and the maximum in the cold valves aperture value are selected, and based in confession
The current temperature measured by cold water temperature measurement table T1, cold water flow measurement table F is respectively arranged with water and water return pipeline L1, L2
Degree, the confession backwater differential pressure of air-conditioning system, to for carrying out variable frequency adjustment to the primary pump of the backwater of cold device 10；Cold power control
Device C10a processed is then according to the cold water of supply channel L1 cold water temperature, water return pipeline L2 return water temperature and cold device 10
Flow, Power Control is carried out to cold device 10；Also, cold water Minimum Flow Control device C10c is right then according to cold water flow
Return valve on balance pipeline L4 is controlled.
Here, it is necessary to which explanation, balance pipeline L4 is mainly used in overcoming in system static waterpower uneven, while also having
The safeguard protection effect of guaranteed cold minimum discharge.Return valve U is arranged on balance pipeline L4, by ensuring cold water flow most
Small value, can play a protective role to cold operation.
In addition, fan coil is the preferable end prod of central air-conditioning, by heat exchanger, water pipe, filter, fan connects
Water pond, air bleeding valve, the composition such as support, its operation principle is the continuous air in room where recycling in unit, leads to air
It is subcooled after water coil and is cooled, keeps the constant of room temperature.Specifically, fan coil air-conditioner end is according to room temperature
And the deviation of design temperature, according to fixed logic, is opened and closed cold water two-way electromagnetic valve and adjusts fan high speed, middling speed, low speed
Gear, it is clear that in all run mode automatic identifications, fan open in high speed mode cold water magnetic valve heat exchange amount be it is maximum,
Because fan coil typically uses the design of two-way electromagnetic valve, thus it is difficult to obtain two-way electromagnetic valve using in the prior art
Valve seat opening.
Because two-port valve only has conducting and cut-off two states, cold water regulating valve can be directly obtained like that different from regulating valve
The aperture of door, therefore, in order to weigh " aperture " of two-port valve, introduces the concept of equivalent valve seat opening value in the present invention.This hair
Bright is to ask in air-conditioning system or branch road cold valves position maximum in all air conditioning terminals to find, thus to fan coil etc.
The calculating of effect valve seat opening value can be reduced to the make-and-break status information Wi according to two-way electromagnetic valve to calculate.
In this regard, the example of a concrete application scene as the embodiment of the present invention, as shown in Fig. 4 and Fig. 6, in the implementation
In example, the cold output control device C10a includes：
Cold water temperature measurement table T1, is arranged on supply channel L1, measurement supply channel L1 cold water temperature T1a；
Return water temperature measurement table T2, is arranged on L2 water return pipelines, measurement water return pipeline L2 return water temperature T2a；
Cold water flow measurement table F, is arranged at cold device 10, the cold water flow Fa of measurement cold device 10；
Return water temperature feedforward controller A1, the return water temperature of the water return pipeline L2 according to measured by return water temperature measurement table T2
T2a, calculates and exports the first power control signal TIC2；
Cold water flow feedforward controller A2, the cold water flow Fa of the cold device according to measured by cold water flow measurement table F,
Calculate and export the second power control signal FIC；
Cold water temperature controller A3, the cold water temperature T1a of the supply channel L1 according to measured by cold water temperature measurement table T1,
Calculate and export the 3rd power control signal TIC1；
Adder, to described first, second and second power control signal TIC2, FIC TIC1 sum, will ask
Value with after is exported as power control signal.
According to the power control signal, the power of cold device 10 is controlled.
More specifically, as shown in Figure 5 and 7, the primary pump frequency-converting control device C10b includes：
The equivalent valve seat opening computing unit C1 of fan coil, the equivalent valve seat opening value for calculating fan coil；
Maximum value signal selector S2, receives the equivalent valve position that the equivalent valve seat opening computing unit C1 of fan coil is calculated
Opening value Va (being V1~Vm in Fig. 7), and the cold valves of other air conditioning terminals in air-conditioning system in addition to fan coil are opened
Angle value (being U1~Un in Fig. 7), the equivalent valve seat opening value of selection (is in Fig. 7 with the maximum in the cold valves aperture value
UV), as valve seat opening signal (being UV in Fig. 7) output；
Cold water temperature measurement table T1, is arranged on supply channel L1, measurement supply channel L1 cold water temperature T1a；
Water flow temperature transfinites controller A4, for the cold water temperature T1a measured according to cold water temperature measurement table T1, calculates simultaneously
Export the first frequency change control signal TIC-1；
Cold valves valve positioner B3, the valve seat opening signal UV exported according to maximum value signal selector S2, are calculated simultaneously
Output is for backwater differential pressure setpoint signals DP sp；
For backwater differential pressure measurement unit C2, the confession backwater differential pressure Pa for measuring air-conditioning system 20；
For backwater differential pressure controller A5, the confession backwater differential pressure setpoint signal exported according to cold valves valve positioner B3
Confession backwater differential pressure value Pa measured by DPsp and confession backwater differential pressure computing unit C2, calculates and exports for the control of backwater differential pressure
Signal FSP；
Cold water flow measurement table F, is arranged at cold device 10, the cold water flow Fa of measurement cold device 10；
Cold water flow controller A6, makees according to the confession backwater differential pressure control signal FSP exported for backwater differential pressure controller C2
For the cold water flow Fa measured by cold water flow setting value and cold water flow measurement table F, calculate and export cold water flow control
Signal FIC-1；
Frequency conversion Staged cotrol device A7, the flow control signal exported according to the cold water flow controller calculates output the
Two frequency change control signals；
The low selector S1 of signal, selection water flow temperature transfinite controller A4 output the first frequency change control signal TIC-1 and
The low signal of signal value in second frequency change control signal FIC-2 of frequency conversion Staged cotrol device A7 outputs, controls to believe as primary pump
Number output；
One-level pump controller B2, the primary pump control signal exported according to the low selector S1 of signal, is carried out to primary pump P10
VFC；
As shown in Figure 5 and 7, the cold water Minimum Flow Control device C10c also includes：
Flowed back Staged cotrol device A8, and the flow control signal FIC-1 exported according to the cold water flow controller is calculated defeated
The control signal of the return valve gone out on balance pipe.
For example, in one particular embodiment of the present invention, as shown in FIG. 6 and 7,
T2a is return water temperature, access return water temperature feedforward controller A1 input, is used as measured value.Fa is cold water stream
Amount, access cold water flow feedforward controller A2 input, is used as measured value.T1a is cold water temperature, access cold water temperature control
Device A3 input, is used as measured value.Return water temperature feedforward controller A1 output signal TIC2, cold water flow feedforward controller
A2 output signal FIC, cold water temperature controller A3 output signal TIC1 sums as cold device 10 input signal.
Here, it is necessary to which explanation, cold water temperature controller A3 uses pid control algorithm, feedforward controller algorithm is used
Lead-lag algorithm, form is K* (1+T1S)/(1+T2S), and certainly, the embodiment of the present invention is merely illustrative to this, is not limited especially
It is fixed.
In this embodiment of the invention, because cold water temperature is realized by adjusting cold power, only when cold
When acc power matches with air conditioning terminal customer charge, cold water temperature can just be stablized, and the change of cold water flow, return water temperature is
Reflect air conditioning terminal load variations Direct Variable, with cold water flow, return water temperature as load adjustment feed forward variable, significantly
The promptness of load adjustment is improved, cold water temperature can effectively stablize cold water temperature using Multivariable Feedforward feedback control strategy
Degree.
In addition, on off operating modes of the Wi (i=1~m) for each fan coil two-way electromagnetic valve of air-conditioning system in air-conditioning system
Signal, the status signal be ON/OFF types, its as the equivalent valve seat opening computing unit C1 of fan coil input variable.Vi
(i=1~m) is the equivalent valve seat opening computing unit C1 of fan coil output variable, and Vi calculated values are following value, i.e.,：One
In individual controlling cycle, the ratio between ON time and total run time of fan coil two-way electromagnetic valve multiply in 100%.Ui (i=1~
N) to be subordinate to other air-conditioner sets such as combined air conditioning box, PAU in same air-conditioning system or branch with fan coil
Cold valves aperture, Ui and Vi are in the lump as maximum value signal selector S2 input, and maximum value signal selector S2 is used to select
The maximum in all signals, but not limited to this are selected, the mode of selection signal can be carried out according to the burden requirement of different units
Adjustment.UV is maximum value signal selector S2 output, and specifically UV is all inputs in maximum value signal selector S2
Maximum, so as to be selected and be exported to cold valves valve positioner B3 input, as cold by maximum value signal selector S2
Water valve valve positioner B3 measured value, cold valves valve positioner B3 setting value typically chooses high level, and such as scope is 90%
~95%, cold valves valve positioner B3 output valve are connected to for backwater differential pressure controller A5, as the control of backwater differential pressure
Device A5 setting value.Pa is the confession backwater differential pressure value Pa of air-conditioning 20, is obtained by being calculated for backwater differential pressure computing unit C2, and export
To the input for backwater differential pressure controller A5, measured value is used as.Fa is cold water flow, and access cold water flow controller A6's is defeated
Enter end, be used as measured value.Connect for backwater differential pressure controller A5 output signal FSP as cold water flow controller A6 setting value
Enter cold water flow controller A6 input, for backwater differential pressure controller A5 as master selector, cold water flow controller A6 makees
For secondary controller, the two constitutes a cascade control system, is controlled for backwater differential pressure controller and cold water flow controller using PID
Algorithm processed.
Further, frequency conversion Staged cotrol device A7 receives the output flow control signal FIC-1 of cold water flow controller as defeated
Enter signal, frequency conversion Staged cotrol device A7 output signal is calculated in the following manner, i.e.,：When cold water flow control signal FIC-1 exists
During 60%~100% change, frequency conversion Staged cotrol device A7 output signal FIC-2 numerical value is equal to FIC-1, when FIC-1 is less than
When 60%, frequency conversion Staged cotrol device A7 output signal FIC-2 outputs 60%；
In addition, T1a is cold water temperature, and access cold water temperature transfinites controller A4 input, is used as measured value.Become frequency division
Range controller A7 output signal FIC-2 transfinites controller A4 output signals TIC-1 as the low selector of signal with cold water temperature
S1 two inputs, the low signal of the low selector S1 selections input numerical value of signal is believed as the low selector S1 of signal output
Number, and access the input of water supply pump frequency converter B 2.So as to which the primary pump P10 of cold device is entered by water supply pump frequency converter B 2
Row VFC；
Separately have, flow back Staged cotrol device A8, receive the output flow control signal FIC-1 of cold water flow controller as defeated
Enter signal, backflow Staged cotrol device A8 output signal is calculated in the following manner, i.e.,：When flow F IC-1 is 0%~60%
During change, the numerical value of backflow Staged cotrol device A8 output signal U changes 100%~0%, i.e.,：U=-5/3*FIC-1+
100%, so as to realize cold cold water minimum discharge safety protection control by the way that balance pipe return valve is adjusted.
In this embodiment of the invention, it is anti-using Multivariable Feedforward according to cold water temperature, return water temperature and cold water flow
Present control technology to implement cold Power Control, the accuracy and promptness of cold power adjustment can be lifted；For backwater differential pressure
Serials control is used with cold water flow, system pressure such as can be eliminated and change the influence exerted oneself to water supply pump, and then reach raising
For the purpose of backwater differential pressure stability.Set minimum cold water flow control, can avoid cold water flow during underload from being less than
Unit allows the safe operation hidden danger that lower limit is brought；And supply backwater differential pressure with cold water temperature using selection control strategy, when cold
During coolant-temperature gage overtemperature, meeting volitional check lifting water supply pump frequency conversion rotating speed generally under high loads, prevents cold when cold water flow is excessive
Coolant-temperature gage is in runaway condition, it can be ensured that requirement of the air-conditioning system to cold water temperature matter.On this basis, according further to institute
The equivalent aperture of the fan coil cold valves of design, when in face of hybrid a/c system with fan coil system, Neng Gougen
One-level pump variable frequency rotating speed is adjusted according to the valve opening in heating power least favorable loop, the premise of air-conditioning system energy requirement is being met
Under, Optimum Hydraulic balance reduces cold water pipe resistance and then reduces cold water conveying energy, reaches realization energy-conservation, safe and stable operation
Purpose, and enable adapt to complicated applications occasion service requirement.
In summary, the present invention is in face of containing combined air conditioning box unit, PAU and fan coil system
Hybrid a/c system, for fan coil system, by the two-way electromagnetic valve ON time and the ratio of total run time of calculating,
To characterize the equivalent aperture of fan coil cold valves, solve the valve position according to heating power least favorable loop to carry out hydraulic equilibrium tune
Whole run into fan coil cold valves aperture can not direct measurement or expression problem, according to the valve in heating power least favorable loop
Aperture adjustment supplies backwater differential pressure setpoint, and then adjusts cold water flow setting value, is carried out eventually through to primary pump frequency conversion rotating speed
Control to realize that Hydraulic transportation energy consumption is minimum.
Finally, it is necessary to which what is illustrated is, although illustrate each controller and temperature in described above by taking integrated device as an example
Measurement table is illustrated, still, they can be integrated in an integrated controller, or respectively to should integrated controller
Each functional module, the embodiment of the present invention is not limited this.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (4)
1. a kind of change differential pressure control system suitable for air-conditioning Variable flow system, including cold device, it is connected to the cold dress
The supply channel for the delivery port put, be connected to the cold device water inlet water return pipeline, be arranged on the supply channel
Air-conditioning system between the water return pipeline and the balance pipeline being arranged in parallel with the air-conditioning system；
Characterized in that, the air-conditioning system includes one or more air conditioning terminals in parallel, air conditioning terminal is to include fan unit
Polytype including pipe；The water return pipeline, which is provided with, is used for the primary pump to cold device backwater；
The control system also includes：
Cold output control device, for the cold water temperature according to the supply channel, the water return pipeline return water temperature with
And the cold water flow of the cold device, Power Control is carried out to the cold device；
Primary pump frequency-converting control device, the equivalent valve seat opening value for calculating the fan coil, according to the air-conditioning system
All air conditioning terminal cold valves valve seat opening values, the cold water temperature of the supply channel, the cold device cold water flow with
And the confession backwater differential pressure of the air-conditioning system, VFC is carried out to the primary pump；
Cold water Minimum Flow Control device, is carried out according to the cold water flow of the cold device to the return valve on the balance pipe
Control.
2. control system according to claim 1, it is characterised in that
The cold output control device includes：
Cold water temperature measurement table, is arranged on the supply channel, measures the cold water temperature of the supply channel；
Return water temperature measurement table, is arranged on the water return pipeline, measures the return water temperature of the water return pipeline；
Cold water flow measurement table, is arranged at the cold device, measures the cold water flow of the cold device；
Return water temperature feedforward controller, the return water temperature of the water return pipeline according to measured by the return water temperature measurement table,
Calculate and export the first power control signal；
Cold water flow feedforward controller, the cold water flow of the cold device according to measured by the cold water flow measurement table,
Calculate and export the second power control signal；
Cold water temperature controller, the cold water temperature of the supply channel according to measured by the cold water temperature measurement table is calculated
And export the 3rd power control signal；
Adder, to described first, second and the 3rd power control signal sum, regard the value after summation as power control
Signal output processed.
3. control system according to claim 1 or 2, it is characterised in that
The primary pump frequency-converting control device includes：
The equivalent valve seat opening computing unit of fan coil, the equivalent valve seat opening value for calculating the fan coil；
Maximum value signal selector, receives the equivalent valve seat opening that the equivalent valve seat opening computing unit of fan coil is calculated
Value, and other air conditioning terminals in air-conditioning system in addition to fan coil cold valves aperture value, select the equivalent valve position
Opening value and the maximum in the cold valves aperture value, are used as valve seat opening signal output；
Cold water temperature measurement table, is arranged on the supply channel, measures the cold water temperature of the supply channel；
Water flow temperature transfinites controller, for the cold water temperature measured according to the cold water temperature measurement table, calculates and exports
One frequency change control signal；
Cold valves valve positioner, the valve seat opening signal exported according to the maximum value signal selector, calculates and exports confession
Backwater differential pressure setpoint signal；
For backwater differential pressure measurement unit, the confession backwater differential pressure for measuring the air-conditioning system；
For backwater differential pressure controller, the confession backwater differential pressure setpoint signal that is exported according to the cold valves valve positioner and
Confession backwater differential pressure value measured by the confession backwater differential pressure computing unit, calculates and exports for backwater differential pressure control signal；
Cold water flow measurement table, is arranged at the cold device, measures the cold water flow of the cold device；
Cold water flow controller, cold water stream is used as according to the confession backwater differential pressure control signal that the confession backwater differential pressure controller is exported
Cold water flow measured by the setting value of amount controller and the cold water flow measurement table, is calculated and output flow control letter
Number；
Frequency conversion Staged cotrol device, the flow control signal exported according to the cold water flow controller calculates the second frequency conversion of output
Control signal；
The low selector of signal, selects the water flow temperature to transfinite the first frequency change control signal and the change frequency division of controller output
The low signal of signal value, is exported as primary pump control signal in second frequency change control signal of range controller output；
One-level pump controller, the primary pump control signal exported according to the low selector of the signal, becomes to the primary pump
Frequency is controlled.
4. control system according to claim 3, it is characterised in that
Cold water Minimum Flow Control device includes, and flow back Staged cotrol device, the flow exported according to the cold water flow controller
Control signal, calculates and exports the control signal of the return valve on the balance pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510464559.4A CN105020822B (en) | 2015-07-31 | 2015-07-31 | Suitable for the change differential pressure control system of air-conditioning Variable flow system |
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| CN201510464559.4A CN105020822B (en) | 2015-07-31 | 2015-07-31 | Suitable for the change differential pressure control system of air-conditioning Variable flow system |
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| CN107466187B (en) * | 2017-08-08 | 2023-08-08 | 广东申菱环境系统股份有限公司 | Liquid cooling heat exchange device and control method thereof |
| CN108332362B (en) * | 2018-02-24 | 2020-05-12 | 浙江盾安自控科技有限公司 | Heating, ventilation and circulating water system energy-saving control system and method based on vectorization analysis |
| CN114087149B (en) * | 2021-11-17 | 2023-12-05 | 重庆大学 | Variable control loop of plunger pump with double-cavity independent control and multi-mode switching control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3652974B2 (en) * | 2000-09-26 | 2005-05-25 | ダイダン株式会社 | Primary pump heat source variable flow rate system |
| CN100445655C (en) * | 2007-01-23 | 2008-12-24 | 贵州汇通华城楼宇科技有限公司 | Heating ventilating and air conditioning hydraulic dynamic regulation method and device based on energy distribution equilibrium |
| CN101782260B (en) * | 2010-01-22 | 2012-08-15 | 华中科技大学 | Optimal control method and device for water system of air conditioning |
| CN101769586B (en) * | 2010-02-04 | 2013-02-06 | 无锡永信能源科技有限公司 | Cold (warm) water circulation energy efficiency control method for central air-conditioning system |
| CN102705956B (en) * | 2012-06-01 | 2014-07-30 | 武汉裕生智能节能设备有限公司 | Optimal control device and method for primary pump variable flow system |
| CN103277863B (en) * | 2013-06-24 | 2015-12-09 | 机械工业第三设计研究院 | Air conditioner cold water variable-flow system and control method thereof |
| CN103994554A (en) * | 2014-05-30 | 2014-08-20 | 厦门立思科技股份有限公司 | Variable pressure difference control device, method and system for air-conditioner |
| CN204830288U (en) * | 2015-07-31 | 2015-12-02 | 新智能源系统控制有限责任公司 | Control system is pressed to variation suitable for air conditioner one -level pumping system |
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