CN204987365U - Become water temperature control system suitable for air conditioner one -level pumping system - Google Patents
Become water temperature control system suitable for air conditioner one -level pumping system Download PDFInfo
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- CN204987365U CN204987365U CN201520571542.4U CN201520571542U CN204987365U CN 204987365 U CN204987365 U CN 204987365U CN 201520571542 U CN201520571542 U CN 201520571542U CN 204987365 U CN204987365 U CN 204987365U
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Abstract
The utility model provides a become water temperature control system suitable for air conditioner one -level pumping system relates to refrigeration control field, accuracy when improving cold quick -witted the power adjustment with reduce the energy consumption and invent. This control system is including cooling machine, supply channel, return water pipeline, air conditioning system and balanced pipeline, and wherein, air conditioning system includes that the parallelly connected air conditioner of one or more is terminal, the terminal multiple type that is including fan coil of air conditioner, the wet return is equipped with the one -level pump on the road, this control system still is used for obtaining return water temperature including cold quick -witted power preprocessing device and cold quick -witted power control unit and water supply differential pressure controlling means, cold quick -witted power preprocessing device, cold quick -witted power control unit is the maximum value in the terminal cold water valve position apertures of all air conditioners and the rivers temperature of cold quick -witted power preprocessing device output in according to air conditioning system, carries out power control to cold machine. The utility model discloses can be used to be applicable to the quick -witted power control of the cold technique in the air conditioner one -level pumping system.
Description
Technical field
The utility model relates to handpiece Water Chilling Units control field, particularly relates to a kind of change water temperature 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 general 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 variable frequency pump, although the one-level general pump adopted within air-conditioning systems cannot carry out Flow-rate adjustment as one-level variable frequency pump, due to its fewer than one-level variable frequency pump trouble point, namely lacked a set of converter plant, therefore systematic function is more stable.
For being applicable in the change water temperature control system of air-conditioning Variable flow system, in order to really overcome energy consumption waste, because of primary pump employing is general pump, and cold water conveying can not need to consider, only need start with from the adjustment of cold power, realize the cold equilibrium of supply and demand simultaneously, reduce cold energy consumption, have the technology of two aspects at present, one is the cold power regulation technology based on air conditioner load, it calculates handpiece Water Chilling Units set value of the power according to the load of air-conditioning, realizes cold supply and mates with the effective of air conditioner load; Two is constant water outlet temperature setting values, and cold power adjusts automatically with the change of return water temperature; Hydraulic equilibrium control technology, in existing correlation technique, general employing is by adjusting balance pipe return valve to the stable burden requirement adapting to air-conditioning system for backwater differential pressure.
But, cold power regulation technology based on air conditioning design load calculation value, usual foundation water supply flow and supply backwater temperature difference calculating get, its reliability of flow instrument Long-Time Service and the degree of accuracy are difficult to guarantor and levy, obviously the time difference is there is because confession water return pipeline length is different, flow velocity is different in the supply water temperature simultaneously for air conditioning design load calculation from return water temperature, and this time difference is change, above factor often destroys the accuracy of air conditioning design load calculation, thus causing load adjustment there is deviation, the equilibrium of supply and demand is difficult to real foundation; And constant water outlet temperature setting value, cold power adjusts automatically with the change of return water temperature, Problems existing is the needs for meeting high load capacity, it is lower that typical temperature setting value is arranged, and when underload, cold efficiency can be in a lower state, causes the problem that energy consumption is too high.
In sum, in above-mentioned air-conditioned load adjustment technology, there is the not good problem of cold power adjustment accuracy in above-mentioned technology.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of change water temperature control system being applicable to air-conditioning Variable flow system, for guaranteeing accuracy when cold power adjusts, so that energy-saving and cost-reducing, complicated applications occasion can be applicable to.
For achieving the above object, first aspect of the present utility model, provide a kind of change water temperature 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 type is the polytype comprising fan coil; Water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold power pretreatment unit, for the equivalent valve seat opening value according to described fan coil, and the cold valves opening value of other air conditioning terminal in air-conditioning system except fan coil, select maximum in described air conditioning terminal cold water valve seat opening as output signal;
Cold output control device, for the valve seat opening signal, the water flow temperature of described supply channel and the water flow temperature of described water return pipeline that export according to described cold power pretreatment unit, carries out power control to described cold device;
Water supply difference pressure control device, for according to for backwater differential pressure, controls the return valve on equalizing line.
In the first possible implementation of first aspect of the present utility model, described cold power pretreatment unit 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.
In conjunction with the first possibility of first aspect of the present utility model, in the implementation that the second of first aspect of the present utility model is possible,
Cold output control device comprises:
Cold valves valve positioner, according to the valve seat opening signal that described maximum value signal selector exports, calculates and exports cold water temperature duty setting signal;
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 temperature controller, the cold water temperature duty setting signal exported according to described cold valves valve positioner and the cold water temperature measured by described cold water temperature meter, calculate and export the first control signal value;
Return water temperature feedforward controller, according to the return water temperature measured by described return water temperature meter, calculates and exports the second control signal value;
Adder, sues for peace to described first control signal value and described second control signal value, the value after summation is exported as power control signal.
The change water temperature control system of what the utility model embodiment provided be applicable to air-conditioning Variable flow system, owing to being respectively arranged with multiple temperature measurement equipment such as cold water temperature meter, return water temperature meter in water supply and water return pipeline, thus take full advantage of the parameter of comprehensive reflection such as cold water temperature, return water temperature cold power; 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, change cold water temperature setting value with this and power adjusting is carried out to cold device, effectively establish the equilibrium of supply and demand of cold power and air conditioner load, when control effects shows as underload, cold water temperature setting value is high, otherwise otherwise then; The cold-water reflux amount on equalizing line can be made to drop to minimum simultaneously, thus can realize making handpiece Water Chilling Units keep a higher operational efficiency to reach the object reducing cold energy consumption according to the change of air conditioner load according to the utility model, improve Consumer's Experience.
Accompanying drawing explanation
The schematic diagram being applicable to the change water temperature control system of air-conditioning Variable flow system that Fig. 1 provides for prior art;
Fig. 2 is the schematic diagram being applicable to the change water temperature control system of air-conditioning Variable flow system of the utility model embodiment;
Fig. 3 is the structural representation being applicable to the change water temperature control system of air-conditioning Variable flow system of the utility model embodiment;
The cold power pretreatment unit C10a schematic diagram in systems in which that Fig. 4 is control system shown in Fig. 3;
The cold output control device C10b schematic diagram in systems in which that Fig. 5 is control system shown in Fig. 4;
Fig. 6 is the cold power pretreatment unit of the control system of the utility model embodiment and the principle key diagram of cold output control device;
Fig. 7 is the principle key diagram of the water supply difference pressure control device of the control system of the utility model embodiment.
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 change water temperature control system being applicable to air-conditioning Variable flow system.Below by way of specific embodiment, the change water temperature 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 general pump system of prior art, based on the cold power adjustment technology of air conditioner load, because air conditioner load is difficult to obtain accurate calculated value, the cold equilibrium of supply and demand be difficult to realize; If therefore controlled by the cold power adjustment technology of the air conditioner load in background technology, then Mass Control is difficult to ensure.And for and constant water outlet temperature setting value, cold power adjusts automatically with the change of return water temperature, Problems existing is the needs for meeting high load capacity, it is lower that typical temperature setting value is arranged, and when underload, cold efficiency can be in a lower state, causes the problem that energy consumption is too high.
The cardinal principle of the utility model embodiment is, in the control system of the air-conditioning one-level water pump system provided in the utility model embodiment, 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, adjust cold water temperature setting value according to the valve opening in heating power least favorable loop and then implement the adjustment of cold power, cold energy consumption can be reduced, reach and realize energy-conservation object, 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 change water temperature 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, the water return pipeline L2 being connected to the water inlet of cold the device 10 and air-conditioning system L3 be arranged between supply channel L1 and water return pipeline L2 and be arranged in parallel with described air-conditioning system L3;
Wherein, air-conditioning system L3 comprises one and above air conditioning terminal 20, and air conditioning terminal 20 is the polytype comprising fan coil; Water return pipeline L2 is provided with for the primary pump P10 to cold device backwater;
Control system also comprises:
Cold power pretreatment unit C10a, for the equivalent valve seat opening value according to fan coil 20, and the cold valves opening value of other air conditioning terminal in air-conditioning system L3 except fan coil 20, select maximum in described air conditioning terminal cold water valve seat opening as output signal U V.
Cold output control device C10b, for the valve seat opening signal UV, the water flow temperature T1a of supply channel L1 and the water flow temperature T2a of water return pipeline L2 that export according to cold power pretreatment unit C10a, carries out power control to cold device 10.
Water supply difference pressure control device C10c, for according to for backwater differential pressure, 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 industrial frequency control 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 air-conditioning branch road L3, and finally flow back to cold device 10 via water return pipeline L2.Here, cold power pretreatment unit C10a can carry out the analog computation of valve seat opening to each fan coil in air-conditioning branch road 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, export as valve seat opening signal, cold output control device C10b is then based on supplying water and water return pipeline L1, cold water temperature meter T1 is respectively arranged with in L2, water flow temperature measured by return water temperature meter T2, further combined with the valve seat opening signal that cold power pretreatment unit C10a exports, power adjusting is carried out to cold device 10.Equalizing line L4 is provided with return valve U, water supply difference pressure control device C10c can pass through detected air conditioning terminal for backwater differential pressure, controls, make the cold-water reflux amount on equalizing line L4 drop to minimum to return valve U.
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 of the such adjustable gate of control valve, 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 Figure 4, in this embodiment, cold power pretreatment unit C10a comprises:
Fan coil equivalence valve seat opening computing unit C1, for calculating described fan coil 20 equivalent valve seat opening values;
Maximum value signal selector S1, receive the equivalent valve seat opening value that fan coil equivalence valve seat opening computing unit C1 calculates, and the cold valves opening value of other air-conditioning in same air-conditioning branch road except fan coil, select the maximum in equivalent valve seat opening value and cold valves opening value, export as valve seat opening signal.
More specifically, as shown in Figure 5, described cold output control device C10b comprises:
Cold valves valve positioner A1, according to the valve seat opening signal that maximum value signal selector S1 exports, calculates and exports cold water temperature set value calculation signal;
Cold water temperature meter T1, is arranged on supply channel L1, measures the cold water temperature of supply channel L3;
Return water temperature meter T2, is arranged on water return pipeline L2, measures the return water temperature of water return pipeline L2;
Cold water temperature controller A2, the cold water temperature setting value exported according to cold valves valve positioner A1 and the cold water temperature measured by cold water temperature meter T1, calculate and export the first control signal value TIC1;
Return water temperature feedforward controller A3, according to the return water temperature measured by return water temperature meter T2, calculates and exports the second control signal value TIC2;
Adder, sues for peace to the first control signal value TIC1 and the second control signal value TIC2, the value after summation is exported as power control signal.
For example, in a specific embodiment of the present utility model, as shown in FIG. 6 and 7, Wi (i=1 ~ m) is the on off operating mode signal of each fan coil system two-way electromagnetic valve of certain branch, this status signal is ON/OFF type, and 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, and Vi calculated value is following value, that is: in a control cycle, the ON time of fan coil 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 branch, Ui and Vi is in the lump as the input of maximum value signal selector S1, maximum value signal selector S1 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 S1, specifically UV is the maximum of all inputs in maximum value signal selector S1, thus selected by maximum value signal selector S1 and export the input of cold valves valve positioner A1 to, as the measured value of cold valves valve positioner A1, the setting value of cold valves valve positioner A1 generally chooses high level, if scope is 90% ~ 95%, the output valve of cold valves valve positioner A1 is connected to cold water temperature controller A2, as the setting value of cold water temperature controller A2.T1a is cold water temperature, and the input of access cold water temperature controller A2, as measured value.T2a is return water temperature, and the input of access return water temperature feedforward controller A3, as measured value.Adder S3 by the output signal TIC2 sum of the output signal TIC1 of cold water temperature controller A2, return water temperature feedforward controller A3, as the input signal of the power inverter in cold device 10, in order to control the power of refrigerator device.Here, cold water temperature preset value calculation device A1 and cold water temperature controller A2 can adopt pid control algorithm, return water temperature feedforward controller A3 can adopt lead-lag algorithm, form is K* (1+T1S)/(1+T2S), in addition, water supply difference pressure control device C10c obtains the confession backwater pressure reduction DP from air conditioning terminal 20 side, pid control algorithm etc. can be adopted, according to result of calculation, the return valve U on equalizing line L4 is controlled, the utility model embodiment is only example to this, is not particularly limited.
Wherein, it should be noted that, the quantity of described air-conditioning 20 can be one and more than.
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 the adjustment of cold power or hydraulic balancing regulation run into cannot directly measure or represent, the valve opening adjustment cold water temperature according to heating power least favorable loop and then adjustment cold power in the utility model.
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 (3)
1. be applicable to a change water temperature 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; Water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold power pretreatment unit, for the equivalent valve seat opening value according to described fan coil, and the cold valves opening value of other air conditioning terminal in air-conditioning system except fan coil, select maximum in described air conditioning terminal cold water valve seat opening as output signal;
Cold output control device, for the valve seat opening signal, the water flow temperature of described supply channel and the water flow temperature of described water return pipeline that export according to described cold power pretreatment unit, carries out power control to described cold device;
Water supply difference pressure control device, for according to for backwater differential pressure, controls the return valve on equalizing line.
2. control system according to claim 1, is characterized in that,
Described cold power pretreatment unit 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.
3. control system according to claim 2, is characterized in that,
Cold output control device comprises:
Cold valves valve positioner, according to the valve seat opening signal that described maximum value signal selector exports, calculates and exports cold water temperature duty setting signal;
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 temperature controller, the cold water temperature duty setting signal exported according to described cold valves valve positioner and the cold water temperature measured by described cold water temperature meter, calculate and export the first control signal value;
Return water temperature feedforward controller, according to the return water temperature measured by described return water temperature meter, calculates and exports the second control signal value;
Adder, sues for peace to described first control signal value and described second control signal value, the value after summation is exported as power control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520571542.4U CN204987365U (en) | 2015-07-31 | 2015-07-31 | Become water temperature control system suitable for air conditioner one -level pumping system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520571542.4U CN204987365U (en) | 2015-07-31 | 2015-07-31 | Become water temperature control system suitable for air conditioner one -level pumping system |
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| CN204987365U true CN204987365U (en) | 2016-01-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066343A (en) * | 2015-07-31 | 2015-11-18 | 新智能源系统控制有限责任公司 | Variable water temperature control system applicable to primary pump system of air conditioner |
| CN107588504A (en) * | 2017-09-07 | 2018-01-16 | 廖怒涛 | Air-conditioner water system integrated pump valve control device and control method |
-
2015
- 2015-07-31 CN CN201520571542.4U patent/CN204987365U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066343A (en) * | 2015-07-31 | 2015-11-18 | 新智能源系统控制有限责任公司 | Variable water temperature control system applicable to primary pump system of air conditioner |
| CN105066343B (en) * | 2015-07-31 | 2017-11-28 | 新智能源系统控制有限责任公司 | Suitable for the change water temperature control system of air-conditioning Variable flow system |
| CN107588504A (en) * | 2017-09-07 | 2018-01-16 | 廖怒涛 | Air-conditioner water system integrated pump valve control device and control method |
| CN107588504B (en) * | 2017-09-07 | 2020-07-14 | 廖怒涛 | Pump-valve integrated control device and control method for air-conditioning water system |
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