CN204830288U - Control system is pressed to variation suitable for air conditioner one -level pumping system - Google Patents
Control system is pressed to variation suitable for air conditioner one -level pumping system Download PDFInfo
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- CN204830288U CN204830288U CN201520571325.5U CN201520571325U CN204830288U CN 204830288 U CN204830288 U CN 204830288U CN 201520571325 U CN201520571325 U CN 201520571325U CN 204830288 U CN204830288 U CN 204830288U
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Abstract
The utility model provides a control system is pressed to variation suitable for air conditioner one -level pumping system relates to refrigeration control field, accuracy when improving the adjustment of cold quick -witted power sum hydraulic balance, reduces energy consumption and safety and stability operation invention. This variation presses control system to carry out power control according to cold water, return water temperature and cold water flow to cold machine including cold quick -witted power control unit, one -level pump variable frequency control device and cold water minimum flow control device, cold quick -witted power control unit, one -level pump variable frequency control device for calculating fan coil's equivalent valve position aperture value, according to the terminal cold water valve valve position aperture values of all air conditioners of air conditioning system, cold water temperature, cold water flow and confession return water differential pressure, carrying out frequency conversion control to the one -level pump, cold water minimum flow control device is controlled the balance pipe by pass vavle according to the cold water flow, the utility model is used for air conditioning system's quick -witted power control of cold and frequency conversion control technique.
Description
Technical field
The utility model relates to handpiece Water Chilling Units control field, particularly relates to a kind of variation pressure control system being applicable to air-conditioning Variable flow system.
Background technology
At present, what a part of handpiece Water Chilling Units, particularly Large Central Air Conditioning System system adopted is one-level variable frequency pump.
This be due to, as shown in Figure 1, traditional Variable flow system is as follows: comprise water chilling unit system (i.e. cold device), primary pump group, supply channel and water return pipeline, wherein, supply channel comprises water main 5 and the multiple water supply be arranged in parallel on water main 5 are in charge of 2, water return pipeline comprises return main 6 and the multiple backwater be arranged in parallel on return main 6 are in charge of 3, water chilling unit system comprises the multiple handpiece Water Chilling Units 1 be arranged in parallel, water main 5 comprises multiple water supply and is in charge of 2, return main 6 comprises multiple backwater and is in charge of 3, primary pump group comprises the multiple pumps 4 be arranged in parallel, the outlet pipe of water chilling unit system is connected with the water inlet pipe of primary pump group, the outlet pipe of primary pump group is aggregated into water main 5 and is in charge of 2 with water supply and is connected, and by utilizing backwater to be in charge of 3 and be in charge of 3 return mains gathered 6 by backwater and be back to water chilling unit system and recycle after user.
Different from general pump, the one-level variable frequency pump adopted within air-conditioning systems can regulate water flow, realizes the adjustment of cold water delivery needle to air conditioner load.
At present, for being applicable in the variation pressure control system of air-conditioning Variable flow system, in order to really overcome energy consumption waste, at least need to carry two aspects to start with from the adjustment of cold power and cold water, realize the cold equilibrium of supply and demand and hydraulic equilibrium is the most basic requirement, there is the technology of two aspects at present, one is based on adopting definite value for backwater pressure reduction or becoming the rotating speed that setting value single loop feedback control technology regulates one-level variable frequency pump, implement cold water pipage control, realize cold supply and mate with the effective of air conditioner load; Two is constant water outlet temperature setting values, adopts single loop feedback control technology automatically to adjust the change of cold power with return water temperature.
In existing cold power adjustment with cold water pipage control technology, cold water temperature, confession backwater differential pressure adopt single loop FEEDBACK CONTROL, often have ignored the unit when underload and there is the restriction of cold minimum discharge and protection problem, and Cold water-out temperature likely there will be to transfinite and is in runaway condition and cannot meets the requirement of air conditioning terminal to the matter of cold water when high load capacity, simultaneously, adopt single loop FEEDBACK CONTROL, only have controller after waiting until controlled Parameters variation just can intervene, there is hysteresis quality in adjustment, this control method can affect the stability of technological parameter undoubtedly, and in cold and central air conditioner system, there is various interference, as cold water flow, the change of return water temperature can have considerable influence to the change of cold leaving water temperature, the fluctuation of system pressure also can have influence on the change of cold water flow and then affect for backwater differential pressure, the simple problem that effectively cannot solve technological parameter stability by single loop FEEDBACK CONTROL, also hidden danger can be brought to the security of system cloud gray model.
In addition, adopt setting control also to have the place of its irrationality for backwater differential pressure, differential pressure setpoint is excessive, there is the energy waste problem that cold water conveying can be excessive; And too small, there is semen donors and just have not enough problem in some heating power least favorable loop of air-conditioning system, cannot meet comfort level requirement.
Further, in existing change in backwater differential pressure setpoint control technology, the occasion that cold valves belongs to continuously adjustable air conditioning terminal can only be adapted to, but the occasion containing fan coil air-conditioner type in air-conditioning system cannot be processed.
In sum, in above-mentioned existing cold power adjustment with the load adjustment technology of cold water pipage control air-conditioning, above-mentioned technology all there is cold power and cold water conveying hydraulic balancing regulation accuracy is not good, and security and stability is poor and be difficult to the problem meeting the comfort level requirement of least favorable loop.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of variation pressure control system being applicable to air-conditioning Variable flow system, for guaranteeing accuracy when cold power and hydraulic balancing regulation, so that energy-saving and cost-reducing, safe and stable operation, can be applicable to complicated applications occasion.
For achieving the above object, first aspect of the present utility model, provide a kind of variation pressure control system being applicable to air-conditioning Variable flow system, comprise cold device, be connected to the supply channel of the delivery port of described cold device, the water return pipeline being connected to the water inlet of described cold device, the equalizing line that is arranged on the air-conditioning system between described supply channel and described water return pipeline and is arranged in parallel with described air-conditioning system;
Wherein, described air-conditioning system comprises the air conditioning terminal of one or more parallel connection, and air conditioning terminal is the polytype comprising fan coil; Described water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold output control device, for the return water temperature of the cold water temperature according to described supply channel, described water return pipeline and the cold water flow of described cold device, carries out power control to described cold device;
Primary pump frequency-converting control device, for calculating the equivalent valve seat opening value of described fan coil, according to the confession backwater differential pressure of described air-conditioning system all air conditioning terminals cold valves valve seat opening value, the cold water temperature of described supply channel, the cold water flow of described cold device and described air-conditioning system, VFC is carried out to described primary pump;
Cold water Minimum Flow Control device, the cold water flow according to described cold device controls the return valve on described balance pipe.
In the first possible implementation of first aspect of the present utility model,
Described cold output control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Return water temperature meter, is arranged on described water return pipeline, measures the return water temperature of described water return pipeline;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Return water temperature feedforward controller, the return water temperature of the described water return pipeline measured by described return water temperature meter, calculates and exports the first power control signal;
Cold water flow feedforward controller, the cold water flow of the described cold device measured by described cold water flow meter, calculates and exports the second power control signal;
Cold water temperature controller, the cold water temperature of the described supply channel measured by described cold water temperature meter, calculates and exports the 3rd power control signal;
Adder, sues for peace to described first, second and the second power control signal, the value after summation is exported as power control signal.
In conjunction with first aspect of the present utility model or first aspect of the present utility model the first may, in the implementation that the second of first aspect of the present utility model is possible, described primary pump frequency-converting control device comprises:
Fan coil equivalence valve seat opening computing unit, for calculating the equivalent valve seat opening value of described fan coil;
Maximum value signal selector, receive the equivalent valve seat opening value that described fan coil equivalence valve seat opening computing unit calculates, and the cold valves opening value of other air-conditioning in air-conditioning system except fan coil, select the maximum in described equivalent valve seat opening value and described cold valves opening value, export as valve seat opening signal;
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Water flow temperature transfinites controller, for the cold water temperature measured according to described cold water temperature meter, calculates and exports the first frequency change control signal;
Cold valves valve positioner, according to the valve seat opening signal that described maximum value signal selector exports, calculates and exports for backwater differential pressure setpoint signal;
Confession backwater differential pressure measurement unit, for measuring the confession backwater differential pressure of described air-conditioning system;
For backwater differential pressure controller, according to described cold valves valve positioner export for backwater differential pressure setpoint signal and described for measured by backwater differential pressure computing unit for backwater differential pressure value, calculates and exports and supply backwater differential pressure control signal;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Cold water flow controller, according to described for backwater differential pressure controller export for backwater differential pressure control signal as the cold water flow measured by the setting value of cold water flow controller and described cold water flow meter, calculate and output flow control signal;
Frequency conversion Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low selector of signal, the low signal of signal value in select described water flow temperature to transfinite the first frequency change control signal that controller exports and the second frequency change control signal that described frequency conversion Staged cotrol device exports, exports as primary pump control signal;
Primary pump controller, according to the primary pump control signal that the low selector of described signal exports, carries out VFC to described primary pump.
The second in conjunction with first aspect of the present utility model may, in the third possible implementation of first aspect of the present utility model, cold water Minimum Flow Control device comprises, backflow Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculate and export the control signal of the return valve on described equalizing line.
The variation pressure control system of what the utility model embodiment provided be applicable to air-conditioning Variable flow system, because cold water temperature is realized by adjustment cold power, only have when cold power and air conditioning terminal customer charge match, cold water temperature just can be stablized, and cold water flow, the change of return water temperature is the Direct Variable of reflection air conditioning terminal load variations, with cold water flow, return water temperature is as the feed forward variable of load adjustment, substantially increase the promptness of cold power adjustment, cold water temperature adopts Multivariable Feedforward feedback control strategy effectively can stablize cold water temperature, meet the requirement of air-conditioning system to the matter of cold water, compensate for the lagging influence that traditional cold water temperature single loop feedback control strategy brings.
Adopt serials control for backwater differential pressure and cold water flow, can eliminate as system pressure changes the impact of exerting oneself on water supply pump, and then reach the object improved for backwater differential pressure stability.
Control strategy is selected because cold water flow and cold water temperature adopt, when cold water temperature overtemperature, volitional check water supply pump frequency conversion rotating speed can be promoted, usually under high loads, when preventing cold water flow excessive, cold water temperature is in runaway condition, cannot meet the requirement of air conditioning terminal to the matter of cold water.
And when underload, cool water quantity needed for air-conditioning system reduces, cold safe operation problem is caused by the flow of cold is too small under preventing extreme case, water supply pump frequency conversion and balance pipe return valve adopt Staged cotrol technology, when water supply pump minimum speed cannot ensure discharge minimum of a value, by return valve on adjustment balance pipe to ensure the minimum discharge by cold.
Its equivalent valve seat opening value is calculated on this basis by the fan coil equivalence valve seat opening computing unit be arranged on fan coil, thus solve the measurement problem of the valve seat opening under complicated applications occasion further, make it to operate in a high-value according to the maximum in cold water valve position in all air conditioning terminals of air-conditioning system, one can be obtained reasonably for backwater differential pressure setpoint, can ensure that in air-conditioning system, least favorable loop, to the demand of energy and simultaneously minimum cold water conveying energy, effectively establishes the equilibrium of supply and demand of cold water conveying and air conditioner load;
Thus can realize rapid adjustment can making handpiece Water Chilling Units power according to the change of air conditioner load according to the utility model, meet supply and demand energy balance; Can according to the change of air conditioner load, by adjusting cold water variable frequency pump rotating speed in time, realize cold water conveying energy consumption minimum, can ensure when high load capacity simultaneously, meet air-conditioning system to the safety assurance flowing through handpiece Water Chilling Units cold water minimum discharge when the requirement of the matter of cold water temperature and underload, with its simultaneously, by changing for backwater pressure differential resetting value strategy, to ensure that in air-conditioning system that the demand of least favorable loop to energy is gone forward side by side the low cold water conveying energy consumption of a step-down.
Accompanying drawing explanation
The schematic diagram of the air-conditioning Variable flow system that Fig. 1 provides for prior art;
Fig. 2 is the general frame schematic diagram being applicable to air-conditioning Variable flow system of the utility model embodiment;
Fig. 3 is the schematic diagram being applicable to the variation pressure control system of air-conditioning Variable flow system of the utility model embodiment;
The cold output control device C10a schematic diagram in systems in which that Fig. 4 is control system shown in Fig. 3;
The primary pump frequency-converting control device C10b that Fig. 5 is control system shown in Fig. 3 and cold water Minimum Flow Control device C10c schematic diagram in systems in which;
Fig. 6 is the principle key diagram of the cold output control device C10a of the control system of the utility model embodiment;
Fig. 7 is the primary pump frequency-converting control device C10b of the control system of the utility model embodiment and the principle key diagram of cold water Minimum Flow Control device C10c.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
First, the utility model embodiment provides a kind of variation pressure control system being applicable to air-conditioning Variable flow system.Below by way of specific embodiment, the variation pressure control system being applicable to air-conditioning Variable flow system that the utility model embodiment provides is described in detail.
As background technology propose as in the one-level variable frequency pump of prior art, cold power adjustment technology is owing to adopting single loop FEEDBACK CONTROL, and the adjustment of cold power exists hysteresis quality; If therefore controlled by the permanent cold water temperature single loop feedback cold power adjustment technology in background technology, then Mass Control is difficult to ensure.And to existing water supply pump frequency conversion control technique, owing to not considering that air-conditioning system may bring the problem of operation at high and low load, the requirement to cold water temperature matter cannot be met when high load capacity, and the safe operation problem that the requirement that cannot meet cold minimum discharge when underload causes; In addition, desirable for backwater differential pressure be can meet heating power least favorable loop in air-conditioning system energy requirement and the conveying energy consumption of water supply pump is minimum, regrettably, for containing the air-conditioning system of fan coil at interior multi-type air conditioner end, this existingly becomes the problem that cannot effectively solve for backwater differential pressure technology.
The cardinal principle of the utility model embodiment is, at the variation pressure control system being applicable to air-conditioning Variable flow system that the utility model embodiment provides, implements the timely rapid adjustment of cold power according to cold water temperature, return water temperature and cold water flow, and further according to the equivalent aperture of designed fan coil cold valves, faced by there is the hybrid a/c system of fan coil system time, suitable confession backwater differential pressure is found 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 meeting idle call energy demand, Optimum Hydraulic balances, reducing cold water pipe resistance and then reduce cold water conveying can, reach and realize energy-conservation object, the requirement of cold water temperature matter when simultaneously can take into account high load capacity, during underload, cold is to the safety requirements of cold water flow minimum of a value, enable the service requirement adapting to complicated applications occasion.
Specifically, for the problem existing for above-mentioned background technology, the utility model embodiment provides a kind of variation pressure control system being applicable to air-conditioning Variable flow system, as shown in Figures 2 and 3, the equalizing line L4 comprising cold device 10, be connected to the supply channel L1 of the delivery port of cold device 10, be connected to the water return pipeline L2 of the water inlet of cold device 10, be arranged on the air-conditioning system 20 between supply channel L1 and water return pipeline L2 and be arranged in parallel with described air-conditioning system.
Wherein, air-conditioning system 20 can comprise the air conditioning terminal of one or more parallel connection, and air conditioning terminal is the polytype comprising fan coil; Water return pipeline L2 is provided with for the primary pump P10 to cold device 10 backwater.
Control system also comprises:
Cold output control device C10a, for the return water temperature of the cold water temperature according to supply channel L1, water return pipeline L2 and the cold water flow of cold device 10, carries out power control to cold device 10.
Primary pump frequency-converting control device C10b, for calculating the equivalent valve seat opening value of fan coil, according to the cold valves valve seat opening value of air conditioning terminals all in air-conditioning system, the cold water temperature of supply channel L1, the cold water flow of cold device 10 and air-conditioning system 20 for backwater differential pressure, P10 VFC is carried out to primary pump.
Cold water Minimum Flow Control device C10c, for according to cold water flow, controls the return valve U on equalizing line L4.
Below the course of work of the utility model above-described embodiment is briefly explained.Current, under the VFC of primary pump P10, are supplied to supply channel L1 by cold device 10, and current flow through supply channel L1 and are 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 carry out the analog computation of valve seat opening to each fan coil in air-conditioning system 20, obtain the equivalent valve seat opening value of the cold valves aperture being equivalent to other types air-conditioning, thus select the maximum in described equivalent valve seat opening value and described cold valves opening value, and based on supply water and be respectively arranged with in water return pipeline L1, L2 water flow temperature measured by cold water temperature meter T1, cold water flow process meter F, air-conditioning system for backwater differential pressure, to for carrying out variable frequency adjustment to the primary pump of cold device 10 backwater; Cold output control device C10a then according to the cold water flow of the cold water temperature of supply channel L1, the return water temperature of water return pipeline L2 and cold device 10, carries out power control to cold device 10; Further, cold water Minimum Flow Control device C10c, then according to cold water flow, control the return valve on equalizing line L4.
Here, it should be noted that, equalizing line L4 is mainly used in overcoming Static Water force unbalance in system, also has the safeguard protection effect ensureing cold minimum discharge simultaneously.Return valve U is arranged on equalizing line L4, by guaranteeing cold water flow minimum of a value, can run play a protective role to cold.
In addition, fan coil is the desirable end prod of central air-conditioning, by heat exchanger, and water pipe, filter, fan, drip tray, air bleeding valve, the compositions such as support, its operation principle is the air in constantly recirculation room, place in unit, makes air by cooled after chilled water coil, to keep the constant of room temperature.Specifically, fan coil air-conditioner end is according to the deviation of room temperature and design temperature, according to fixing logic, opening and closing cold water two-way electromagnetic valve also adjusts the gear of fan high speed, middling speed, low speed, obviously, in all run mode automatic identification, fan in high speed mode open cold water solenoid valve heat exchange amount is maximum, because fan coil generally adopts the design of two-way electromagnetic valve, be thus difficult to adopt the valve seat opening obtaining two-way electromagnetic valve in prior art.
Because two-port valve only has conducting and cut-off two states, be different from the aperture that control valve directly can obtain cold water control valve like that, therefore, in order to weigh " aperture " of two-port valve, in the utility model, introduce the concept of equivalent valve seat opening value.The utility model to ask in air-conditioning system or branch road cold water valve position maximum in all air conditioning terminals to find, and thus calculates the make-and-break status information Wi that the calculating of fan coil equivalence valve seat opening value can be reduced to according to two-way electromagnetic valve.
To this, as the example of an embody rule scene of the utility model embodiment, as shown in Fig. 4 and Fig. 6, in this embodiment, described cold output control device C10a comprises:
Cold water temperature meter T1, is arranged on supply channel L1, measures the cold water temperature T1a of supply channel L1;
Return water temperature meter T2, is arranged on L2 water return pipeline, measures the return water temperature T2a of water return pipeline L2;
Cold water flow meter F, is arranged on cold device 10 place, measures the cold water flow Fa of cold device 10;
Return water temperature feedforward controller A1, the return water temperature T2a of the water return pipeline L2 measured by return water temperature meter T2, calculate and export the first power control signal TIC2;
Cold water flow feedforward controller A2, the cold water flow Fa of the cold device measured by cold water flow meter 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 measured by cold water temperature meter T1, calculate and export the 3rd power control signal TIC1;
Adder, sues for peace to described first, second and second power control signal TIC2, FICTIC1, the value after summation is exported as power control signal.
According to this power control signal, the power of cold device 10 is controlled.
More specifically, as shown in Figure 5 and 7, described primary pump frequency-converting control device C10b comprises:
Fan coil equivalence valve seat opening computing unit C1, for calculating the equivalent valve seat opening value of fan coil;
Maximum value signal selector S2, receive the equivalent valve seat opening value Va (being V1 ~ Vm in Fig. 7) that fan coil equivalence valve seat opening computing unit C1 calculates, and the cold valves opening value (being U1 ~ Un in Fig. 7) of other air conditioning terminal in air-conditioning system except fan coil, select the maximum in equivalent valve seat opening value and described cold valves opening value (being UV in Fig. 7), export as valve seat opening signal (being UV in Fig. 7);
Cold water temperature meter T1, is arranged on supply channel L1, measures the cold water temperature T1a of supply channel L1;
Water flow temperature transfinites controller A4, for the cold water temperature T1a measured according to cold water temperature meter T1, calculates and exports the first frequency change control signal TIC-1;
Cold valves valve positioner B3, according to the valve seat opening signal UV that maximum value signal selector S2 exports, calculates and exports for backwater differential pressure setpoint signals DP sp;
Confession backwater differential pressure measurement unit C2, for measuring the confession backwater differential pressure Pa of air-conditioning system 20;
For backwater differential pressure controller A5, according to cold valves valve positioner B3 export for backwater differential pressure setpoint signals DP sp and for measured by backwater differential pressure computing unit C2 for backwater differential pressure value Pa, calculates and exports and supply backwater differential pressure control signal FSP;
Cold water flow meter F, is arranged on cold device 10 place, measures the cold water flow Fa of cold device 10;
Cold water flow controller A6, supplies backwater differential pressure control signal FSP as the cold water flow Fa measured by cold water flow setting value and cold water flow meter F according to what export for backwater differential pressure controller C2, calculates and export cold water flow control signal FIC-1;
Frequency conversion Staged cotrol device A7, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low signal of signal value in the second frequency change control signal FIC-2 that the low selector S1 of signal, the first frequency change control signal TIC-1 that controller A4 exports and frequency conversion Staged cotrol device A7 that selects water flow temperature to transfinite export, exports as primary pump control signal;
Primary pump controller B2, according to the primary pump control signal that the low selector S1 of signal exports, carries out VFC to primary pump P10;
As shown in Figure 5 and 7, described cold water Minimum Flow Control device C10c also comprises:
Backflow Staged cotrol device A8, according to the flow control signal FIC-1 that described cold water flow controller exports, calculates the control signal of the return valve exported on balance pipe.
For example, in a specific embodiment of the present utility model, as shown in FIG. 6 and 7,
T2a is return water temperature, and the input of access return water temperature feedforward controller A1, as measured value.Fa is cold water flow, and the input of access cold water flow feedforward controller A2, as measured value.T1a is cold water temperature, and the input of access cold water temperature controller A3, as measured value.The output signal TIC1 sum of the output signal TIC2 of return water temperature feedforward controller A1, the output signal FIC of cold water flow feedforward controller A2, cold water temperature controller A3 is as the input signal of cold device 10.
Here, it should be noted that, cold water temperature controller A3 adopts pid control algorithm, feedforward controller algorithm adopts lead-lag algorithm, and form is K* (1+T1S)/(1+T2S), certainly, the utility model embodiment is only example to this, is not particularly limited.
In this embodiment of the present utility model, because cold water temperature is realized by adjustment cold power, only have when cold power and air conditioning terminal customer charge match, cold water temperature just can be stablized, and the change of cold water flow, return water temperature is the Direct Variable of reflection air conditioning terminal load variations, with cold water flow, return water temperature as the feed forward variable of load adjustment, substantially increase the promptness of load adjustment, cold water temperature adopts Multivariable Feedforward feedback control strategy effectively can stablize cold water temperature.
In addition, Wi (i=1 ~ m) for the on off operating mode signal of each fan coil two-way electromagnetic valve of air-conditioning system in air-conditioning system, this status signal be ON/OFF type, it is as the input variable of fan coil equivalence valve seat opening computing unit C1.Vi (i=1 ~ m) is the output variable of fan coil equivalence valve seat opening computing unit C1, Vi calculated value is following value, that is: in a control cycle, the ON time of fan coil fan two-way electromagnetic valve is taken advantage of in 100% with the ratio of total run time.Ui (i=1 ~ n) is the cold valves aperture of other air-conditioner set such as combined air conditioning box, PAU be subordinate to fan coil in same air-conditioning system or branch, Ui and Vi is in the lump as the input of maximum value signal selector S2, maximum value signal selector S2 is for selecting the maximum in all signals, but be not limited thereto, select the mode of signal can adjust according to the burden requirement of different unit.UV is the output of maximum value signal selector S2, specifically UV is the maximum of all inputs in maximum value signal selector S2, thus selected by maximum value signal selector S2 and export the input of cold valves valve positioner B3 to, as the measured value of cold valves valve positioner B3, the setting value of cold valves valve positioner B3 generally chooses high level, if scope is 90% ~ 95%, the output valve of cold valves valve positioner B3 is connected to for backwater differential pressure controller A5, as the setting value for backwater differential pressure controller A5.Pa be air-conditioning 20 for backwater differential pressure value Pa, obtain by calculating for backwater differential pressure computing unit C2, and export the input for backwater differential pressure controller A5 to, as measured value.Fa is cold water flow, and the input of access cold water flow controller A6, as measured value.Supply the output signal FSP of backwater differential pressure controller A5 as the input of the setting value access cold water flow controller A6 of cold water flow controller A6, for backwater differential pressure controller A5 as master selector, cold water flow controller A6 is as secondary controller, the two forms a cascade control system, adopts pid control algorithm for backwater differential pressure controller and cold water flow controller.
Have again, frequency conversion Staged cotrol device A7 receives the output flow control signal FIC-1 of cold water flow controller as input signal, the output signal of frequency conversion Staged cotrol device A7 calculates in the following manner, that is: when cold water flow control signal FIC-1 is in 60% ~ 100% change, the numerical value of the output signal FIC-2 of frequency conversion Staged cotrol device A7 equals FIC-1, when FIC-1 lower than 60% time, the output signal FIC-2 of frequency conversion Staged cotrol device A7 exports 60%;
In addition, T1a is cold water temperature, and access cold water temperature transfinites the input of controller A4, as measured value.The output signal FIC-2 of frequency conversion Staged cotrol device A7 and the cold water temperature controller A4 that transfinites outputs signal TIC-1 and inputs as two of the low selector S1 of signal, signal low selector S1 selects signal that input numerical value is low as the output signal of the low selector S1 of signal, and accesses the input of water supply pump frequency converter B 2.Thus the primary pump P10 of cold device carries out VFC by water supply pump frequency converter B 2;
Separately have; backflow Staged cotrol device A8; receive the output flow control signal FIC-1 of cold water flow controller as input signal; the output signal of backflow Staged cotrol device A8 calculates in the following manner; that is: when flow F IC-1 is in 0% ~ 60% change; the numerical value of the output signal U of backflow Staged cotrol device A8 changes 100% ~ 0%, that is: U=-5/3*FIC-1+100%, thus realizes cold cold water minimum discharge safety protection control by carrying out adjustment to balance pipe return valve.
In this embodiment of the present utility model, adopt Multivariable Feedforward feedback control technology to implement cold power according to cold water temperature, return water temperature and cold water flow and control, accuracy and the promptness of cold power adjustment can be promoted; Adopt serials control for backwater differential pressure and cold water flow, can eliminate as system pressure changes the impact of exerting oneself on water supply pump, and then reach the object improved for backwater differential pressure stability.Set minimum cold water flow controls, the safe operation hidden danger that when can avoid underload, cold water flow allows lower limit to bring lower than unit; And adopt for backwater differential pressure and cold water temperature and select control strategy, when cold water temperature overtemperature, volitional check water supply pump frequency conversion rotating speed can be promoted, usually under high loads, when preventing cold water flow excessive, cold water temperature is in runaway condition, can guarantee the requirement of air-conditioning system to cold water temperature matter.On this basis, further according to the equivalent aperture of designed fan coil cold valves, faced by there is the hybrid a/c system of fan coil system time, can according to the valve opening adjustment one-level pump variable frequency rotating speed in heating power least favorable loop, under the prerequisite meeting air-conditioning system energy requirement, Optimum Hydraulic balances, reducing cold water pipe resistance and then reduce cold water conveying can, reach realize energy-conservation, the object of safe and stable operation, and enable the service requirement adapting to complicated applications occasion.
In sum, the utility model is in the face of containing combined air conditioning box unit, the hybrid a/c system of PAU and fan coil system, for fan coil system, by the two-way electromagnetic valve ON time of calculating and the ratio of total run time, characterize the equivalent aperture of fan coil cold valves, solve and carry out according to the valve position in heating power least favorable loop the difficult problem that fan coil cold valves aperture that hydraulic balancing regulation runs into cannot directly measure or represent, valve opening adjustment according to heating power least favorable loop supplies backwater differential pressure setpoint, and then adjustment cold water flow setting value, minimum to realize Hydraulic transportation energy consumption eventually through carrying out control to primary pump frequency conversion rotating speed.
Finally, it should be noted that, although illustrate that each controller and temperature survey table are illustrated for integrated device in above-mentioned explanation, but, their accessible site are in an ICU, or respectively to should each functional module of ICU, the utility model embodiment limit this.
The above; be only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (4)
1. be applicable to a variation pressure control system for air-conditioning Variable flow system, comprise cold device, be connected to the supply channel of the delivery port of described cold device, the water return pipeline being connected to the water inlet of described cold device, the equalizing line that is arranged on the air-conditioning system between described supply channel and described water return pipeline and is arranged in parallel with described air-conditioning system;
It is characterized in that, described air-conditioning system comprises the air conditioning terminal of one or more parallel connection, and air conditioning terminal is the polytype comprising fan coil; Described water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold output control device, for the return water temperature of the cold water temperature according to described supply channel, described water return pipeline and the cold water flow of described cold device, carries out power control to described cold device;
Primary pump frequency-converting control device, for calculating the equivalent valve seat opening value of described fan coil, according to the confession backwater differential pressure of described air-conditioning system all air conditioning terminals cold valves valve seat opening value, the cold water temperature of described supply channel, the cold water flow of described cold device and described air-conditioning system, VFC is carried out to described primary pump;
Cold water Minimum Flow Control device, the cold water flow according to described cold device controls the return valve on described balance pipe.
2. control system according to claim 1, is characterized in that,
Described cold output control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Return water temperature meter, is arranged on described water return pipeline, measures the return water temperature of described water return pipeline;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Return water temperature feedforward controller, the return water temperature of the described water return pipeline measured by described return water temperature meter, calculates and exports the first power control signal;
Cold water flow feedforward controller, the cold water flow of the described cold device measured by described cold water flow meter, calculates and exports the second power control signal;
Cold water temperature controller, the cold water temperature of the described supply channel measured by described cold water temperature meter, calculates and exports the 3rd power control signal;
Adder, sues for peace to described first, second and the 3rd power control signal, the value after summation is exported as power control signal.
3. control system according to claim 1 and 2, is characterized in that,
Described primary pump frequency-converting control device comprises:
Fan coil equivalence valve seat opening computing unit, for calculating the equivalent valve seat opening value of described fan coil;
Maximum value signal selector, receive the equivalent valve seat opening value that described fan coil equivalence valve seat opening computing unit calculates, and the cold valves opening value of other air conditioning terminal in air-conditioning system except fan coil, select the maximum in described equivalent valve seat opening value and described cold valves opening value, export as valve seat opening signal;
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Water flow temperature transfinites controller, for the cold water temperature measured according to described cold water temperature meter, calculates and exports the first frequency change control signal;
Cold valves valve positioner, according to the valve seat opening signal that described maximum value signal selector exports, calculates and exports for backwater differential pressure setpoint signal;
Confession backwater differential pressure measurement unit, for measuring the confession backwater differential pressure of described air-conditioning system;
For backwater differential pressure controller, according to described cold valves valve positioner export for backwater differential pressure setpoint signal and described for measured by backwater differential pressure computing unit for backwater differential pressure value, calculates and exports and supply backwater differential pressure control signal;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Cold water flow controller, according to described for backwater differential pressure controller export for backwater differential pressure control signal as the cold water flow measured by the setting value of cold water flow controller and described cold water flow meter, calculate and output flow control signal;
Frequency conversion Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low selector of signal, the low signal of signal value in select described water flow temperature to transfinite the first frequency change control signal that controller exports and the second frequency change control signal that described frequency conversion Staged cotrol device exports, exports as primary pump control signal;
Primary pump controller, according to the primary pump control signal that the low selector of described signal exports, carries out VFC to described primary pump.
4. control system according to claim 3, is characterized in that,
Cold water Minimum Flow Control device comprises, backflow Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates and exports the control signal of the return valve on described equalizing line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520571325.5U CN204830288U (en) | 2015-07-31 | 2015-07-31 | Control system is pressed to variation suitable for air conditioner one -level pumping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520571325.5U CN204830288U (en) | 2015-07-31 | 2015-07-31 | Control system is pressed to variation suitable for air conditioner one -level pumping system |
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|---|---|
| CN204830288U true CN204830288U (en) | 2015-12-02 |
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|---|---|---|---|
| CN201520571325.5U Withdrawn - After Issue CN204830288U (en) | 2015-07-31 | 2015-07-31 | Control system is pressed to variation suitable for air conditioner one -level pumping system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020822A (en) * | 2015-07-31 | 2015-11-04 | 新智能源系统控制有限责任公司 | Variable pressure difference control system applicable to air conditioner first-stage pump system |
| CN115899999A (en) * | 2023-03-08 | 2023-04-04 | 宁德时代新能源科技股份有限公司 | Air conditioner air cabinet, control method thereof, storage medium and computer program product |
-
2015
- 2015-07-31 CN CN201520571325.5U patent/CN204830288U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020822A (en) * | 2015-07-31 | 2015-11-04 | 新智能源系统控制有限责任公司 | Variable pressure difference control system applicable to air conditioner first-stage pump system |
| CN115899999A (en) * | 2023-03-08 | 2023-04-04 | 宁德时代新能源科技股份有限公司 | Air conditioner air cabinet, control method thereof, storage medium and computer program product |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151202 Effective date of abandoning: 20171020 |