CN106871364A - Method for controlling outlet water temperature of cooling tower of central air-conditioning system - Google Patents
Method for controlling outlet water temperature of cooling tower of central air-conditioning system Download PDFInfo
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- CN106871364A CN106871364A CN201710136349.1A CN201710136349A CN106871364A CN 106871364 A CN106871364 A CN 106871364A CN 201710136349 A CN201710136349 A CN 201710136349A CN 106871364 A CN106871364 A CN 106871364A
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- cooling tower
- temperature
- cooling
- blower fan
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- 238000001816 cooling Methods 0.000 title claims abstract description 318
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004378 air conditioning Methods 0.000 title abstract description 5
- 239000000498 cooling water Substances 0.000 claims description 53
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
- 238000013459 approach Methods 0.000 abstract 2
- 238000005507 spraying Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 101150089473 CWP1 gene Proteins 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 101100008072 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CWP2 gene Proteins 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a control method of the outlet water temperature of a cooling tower of a central air-conditioning system, wherein the central air-conditioning system comprises a control device, a cooling tower group, a cooling pump group and a water chilling unit, the inlet side of the cooling pump group is connected with the water tank side of the cooling tower group, the outlet side of the cooling pump group is connected with the cooling side water inlet of the water chilling unit, the cooling side water outlet of the water chilling unit is connected with the spraying side of the cooling tower group, and the control device is connected with the cooling tower group and the cooling pump group; wherein the control method comprises the steps of: the control device controls the number of the cooling towers in operation and/or controls the number and/or frequency of the cooling tower fans in operation to achieve that the outlet water temperature of the cooling tower reaches or approaches the outdoor wet bulb temperature. The control method of the invention enables the outlet water temperature of the cooling tower to reach or approach the outdoor wet bulb temperature, and the central air-conditioning system has the characteristic of self-searching wet bulb temperature.
Description
Technical field
The present invention relates to air-conditioning technical field, and in particular to a kind of controlling party of central air conditioner system cooling tower leaving water temperature
Method.
Background technology
In central air conditioner system, the cold side return water temperature (namely leaving water temperature of cooling tower) of handpiece Water Chilling Units is to unit energy
Consumption influence is very big, for example, cold side return water temperature often raises 1 DEG C, the COP of unit may reduce by 3%.Cast aside cooling tower sheet
The performance of body, the leaving water temperature of cooling tower is influenceed by outdoor wet-bulb temperature, that is to say, that outdoor wet-bulb temperature is higher, cooling
The water outlet lower limit temperature of tower is also higher.
However, outdoor wet-bulb temperature be over time, the change of weather and change.Although can be passed by wet-bulb temperature
Sensor or Temperature Humidity Sensor are measured to outdoor wet-bulb temperature, but are constrained to the position of sensor installation, often not
The wet-bulb temperature on cooling tower periphery can be accurately measured, causes measurement error larger.In addition, wet bulb temperature sensor or humiture
The certainty of measurement of sensor can also shift over time.Therefore, according to outdoor wet bulb temperature sensor or temperature
The wet-bulb temperature of humidity sensor measurement is often inaccurate come the leaving water temperature for controlling cooling tower.
The content of the invention
Based on above-mentioned present situation, it is a primary object of the present invention to provide a kind of central air conditioner system cooling tower leaving water temperature
Control method, the control method does not need the outer wet-bulb temperature of measuring chamber, and cooling tower can be made to be kept on the premise of more energy-conservation
Leaving water temperature is constantly near lower limit temperature.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of control method of central air conditioner system cooling tower leaving water temperature, the central air conditioner system includes that control is filled
Put, cooling tower group, cooling pump group and handpiece Water Chilling Units, the entrance side of the cooling pump group connects the water tank side of the cooling tower group,
The outlet side of the cooling pump group connects the cold side water inlet of the handpiece Water Chilling Units, the cold side delivery port of the handpiece Water Chilling Units
The spray side of the cooling tower group is connected, the control device is connected with the cooling tower group, the cooling pump group；Wherein, institute
Stating control method includes step：The control device is by the quantity that controls cooling tower to put into operation, and/or control cooling tower wind
The number of units and/or frequency of machine operation are reached realizing cooling tower leaving water temperature or close to outdoor wet-bulb temperature.
Preferably, when central air conditioner system starts, the step of the quantity that the control device control cooling tower puts into operation
Suddenly include：
Quantity according to the cooling water pump of actual motion in the cooling pump group determines the quantity that cooling tower puts into operation.
Preferably, the principle for determining the quantity that cooling tower puts into operation is：The quantity that cooling tower puts into operation be more than etc.
In the smallest positive integral of quantity × 1.5 of cooling water pump operation.
Preferably, during central air conditioner system is run, the quantity that the control device control cooling tower puts into operation
Step includes：
Make the quantity that cooling tower puts into operation between maximum and minimum value, wherein, cooling tower puts into operation quantity
Maximum be quantity × 1.5 run more than or equal to cooling water pump smallest positive integral, cooling tower puts into operation the minimum of quantity
Quantity of the value equal to cooling water pump operation.
Preferably, during central air conditioner system is run, the quantity that the control device control cooling tower puts into operation
Step also includes：
Judge whether to need to reduce by an operation for cooling tower, if desired, then close accumulated running time cooling most long
Tower；
And/or, judge whether to need to increase an operation for cooling tower, if desired, then open accumulated running time most short
Cooling tower.
Preferably, when any one of following condition C 01-C04 meets, the control device is to be judged as needing reduction one
The operation of platform cooling tower：
The quantity of the quantity ＞ cooling water pumps that C01, cooling tower put into operation；
C02, in Jia Ta or when subtracting cumulative time >=the first prefixed time interval after tower flow terminates, if when first is default
Continuously meet in t1 long：The default temperature drop rate of temperature drop rate≤the first of cooling tower outfall sewer；
Temperature≤the first desired temperature of C03, cooling tower outfall sewer；
C04, cooling tower the quantity ＞ cooling towers that put into operation put into operation the maximum of quantity；
And/or, when any one of following condition C 11-C13 meets, the control device is to be judged as needing increase by
The operation of platform cooling tower：
C11, in Jia Ta or when subtracting cumulative time >=the first prefixed time interval after tower flow terminates, if when second is default
Continuously meet in t2 long：The default temperature rise rate of temperature rise rate >=the first of cooling tower outfall sewer；
Temperature >=second temperature the setting value of C12, cooling tower outfall sewer；
The quantity of the quantity ＜ cooling water pumps operation that C13, cooling tower put into operation.
Preferably, first prefixed time interval is 5~20 minutes；
And/or, the first preset duration t1 is 60~180 seconds；
And/or, the described first default temperature drop rate is 0.1~0.2 DEG C/min；
And/or, first desired temperature is 18-20 DEG C；
And/or, the second preset duration t2 is 60~180 seconds；
And/or, the described first default temperature rise rate is 0.1~0.2 DEG C/min；
And/or, the second temperature setting value is 28~32 DEG C.
Preferably, also including step：
During central air conditioner system is run, if continuously meeting in the 3rd preset duration t3：Cooling tower outfall sewer
Temperature >=the 3rd desired temperature, then open the blower fan of all cooling towers for putting into operation；
And/or, during central air conditioner system is run, when all cooling water pumps are to close, or, if default the 6th
Continuously meet in duration t6：The desired temperatures of temperature ＜ the 6th of cooling tower outfall sewer, then close the wind of all of cooling tower
Machine.
Preferably, the 3rd preset duration t3 is 30~90 seconds；
And/or, the 3rd desired temperature is 20~24 DEG C；
And/or, the 6th preset duration t6 is 5~30 seconds；
And/or, the 6th desired temperature is 14~20 DEG C.
Preferably, the step of number of units and/or frequency of the control device control blower fan of cooling tower operation includes：
If blower fan of cooling tower adjusts the number of units of the fan operation of the cooling tower for putting into operation to determine frequency blower fan；
If blower fan of cooling tower is frequency conversion fan, the frequency of the blower fan of all cooling towers for putting into operation is adjusted in synchronism.
Include preferably for the step of determining frequency blower fan, the number of units of the control device adjustment blower fan of cooling tower operation：
Judge whether to need to increase an operation for blower fan of cooling tower, if desired, then open accumulated running time most short
Blower fan of cooling tower；
And/or, judge whether to need to reduce by an operation for blower fan of cooling tower, if desired, then close accumulated running time
Blower fan of cooling tower most long.
Preferably, when following condition Cs 21 are met, the control device is to be judged as needing to increase a blower fan of cooling tower
Operation：
C21, continuously meet in the 4th preset duration t4：The temperature of cooling tower outfall sewer >=the 4th desired temperature；
And/or, when following condition Cs 22 are met, the control device is to be judged as needing to reduce by a blower fan of cooling tower
Operation：
C22, continuously meet in the 5th preset duration t5：The temperature of six desired temperatures≤cooling tower outfall sewer≤
5th desired temperature.
Preferably, the 4th preset duration t4 is 30~90 seconds；
And/or, the 4th desired temperature is 24~28 DEG C；
And/or, the 5th preset duration t5 is 30~90 seconds；
And/or, the 5th desired temperature is 20~24 DEG C；
And/or, the 6th desired temperature is 14~20 DEG C.
Include preferably for frequency conversion fan, the step of the control device is adjusted in synchronism the frequency of all blower fans：
If continuously meeting in the 7th preset duration t7：The temperature of cooling tower outfall sewer >=the 7th desired temperature, then
The frequency of all blower fans is raised into F1；
If continuously meeting in the 7th preset duration t7：The temperature ＜ of eight desired temperatures≤cooling tower outfall sewer
Seven desired temperatures, then raise F2 by the frequency of all blower fans, wherein, F2 ＜ F1；
And/or,
If continuously meeting in the 8th preset duration t8：The temperature ＜ of nine desired temperatures≤cooling tower outfall sewer
Ten desired temperatures, then by the frequency reduction F3 of all blower fans；
If continuously meeting in the 8th preset duration t8：The temperature ＜ of 11 desired temperatures≤cooling tower outfall sewer
9th desired temperature, then by the frequency reduction F4 of all blower fans, wherein, F3 ＜ F4.
Preferably, the 7th preset duration t7 is 5~30 seconds；
And/or, the 7th desired temperature is 28~30 DEG C；
And/or, the 8th desired temperature is 26~28 DEG C.
And/or, F1=2~8Hz；
And/or, F2=0.5~2Hz；
And/or, the 8th preset duration t8 is 5~30 seconds；
And/or, the 9th desired temperature is 14~19 DEG C；
And/or, the tenth desired temperature is 20~24 DEG C.
And/or, the 11st desired temperature is 14~19 DEG C；
And/or, F3=0.5~2Hz；
And/or, F4=2~8Hz.
Control method of the invention by the number of units and/or the number of units of blower fan of cooling tower that control cooling tower to put into operation and/
Or frequency, and monitor the temperature of cooling tower outfall sewer and carry out feedback control, so as to can reach optimal geomantic omen ratio so that cooling
Tower leaving water temperature can reach or close to outdoor wet-bulb temperature, system is had from the characteristic for seeking wet-bulb temperature, without surveying
The outdoor wet-bulb temperature of amount.
Especially, the cooling of temperature drop rate and air-conditioner water system that control method of the invention passes through cooling tower outfall sewer
System geomantic omen than control method come the number of units and the number of units of blower fan of cooling tower and/or frequency that control cooling tower to put into operation, from
And realize system from the characteristic for seeking wet-bulb temperature.
Brief description of the drawings
Hereinafter with reference to accompanying drawing to the excellent of the control method of central air conditioner system cooling tower leaving water temperature of the invention
Implementation method is selected to be described.In figure：
Fig. 1 is the schematic diagram of the handpiece Water Chilling Units cold side according to central air conditioner system of the invention；
Fig. 2 is to be shown according to the basic control flow journey of the control method of central air conditioner system cooling tower leaving water temperature of the invention
It is intended to；
Fig. 3 is the preferred embodiment of the control method according to central air conditioner system cooling tower leaving water temperature of the invention
Control flow schematic diagram.
Specific embodiment
Referring first to Fig. 1, the master of the handpiece Water Chilling Units cold side of central air conditioner system involved in the present invention is illustrated therein is
Want part.As shown in figure 1, central air conditioner system of the present invention includes control device 100, cooling tower group 200, cooling
Pump group 300 and handpiece Water Chilling Units 400.Wherein, the entrance side of the cooling pump group 300 connects the water tank side of the cooling tower group 200
(i.e. water outlet side), the outlet side of the cooling pump group 300 connects the cold side water inlet of the handpiece Water Chilling Units 400, the cold water
The cold side delivery port of unit 400 connects the spray side (i.e. influent side) of the cooling tower group 200, the control device 100 with
The cooling tower group 200, the cooling pump group 300 are connected.
Specifically, cooling tower group 200 includes many cooling towers, such as CT1, CT2, CT3 shown in Fig. 1 ... CTn,
N platforms, have blower fan of cooling tower inside every cooling tower altogether, and the blower fan of cooling tower can be frequency conversion fan, or determine frequency
Blower fan.Generally, the blower fan type of each cooling tower in cooling tower group 200 is consistent, otherwise frequency conversion fan is all, or
It is all and determines frequency blower fan.As shown in figure 1, every blower fan of cooling tower is connected with control device 100, so that can be by control device 100
Control its on off state and/or running frequency.
As shown in figure 1, be respectively equipped with can be by the controlling switch of control device 100 for the spray side (i.e. influent side) of each cooling tower
Valve, V1 as shown in Figure 1, V2, V3 ..., Vn, being also respectively equipped with can for the water tank side (i.e. water outlet side) of each cooling tower
By the valve of the controlling switch of control device 100, V1 ' as shown in Figure 1, V2 ', V3 ' ..., Vn '.Preferably, these valves
It is electric butterfly valve.Control device 100 is by controlling the on off state of the valve of the Inlet and outlet water both sides of each cooling tower, you can control
The switch of the passage of corresponding cooling tower is made, so as to control whether the cooling tower puts into operation.
In the present invention, for a cooling tower, as long as the valve of its Inlet and outlet water both sides is opened, then the cooling tower is logical
Road has just been opened, that is, think that the cooling tower has put into operation.In the case where cooling tower puts into operation, its internal blower fan can be with
It is to open running status, or closed mode.It is easily understood that for the cooling tower for putting into operation, when in it
When the blower fan in portion opens operation, the cold water temperature when cold water temperature in its water tank can be closed significantly lower than blower fan.
As shown in figure 1, cooling pump group 300 includes many cooling water pumps, and in the case where the number of units of cooling tower is for n, cooling
The number of units of water pump can be n or n+1, for example, show n+1 platform cooling water pumps in figure, respectively CWP1, CWP2, CWP3 ...
CWPn, CWP (n+1), these cooling water pumps are connected with control device 100, so as to can be opened under the control of control device 100
Or close.
As shown in figure 1, handpiece Water Chilling Units 400 include many handpiece Water Chilling Units, such as the n platforms of diagram.
In addition, as shown in figure 1, being provided with cooling water house steward between cold water pump group 300 and handpiece Water Chilling Units 400
One temperature sensor 501, for measuring cold side return water temperature (namely the temperature of cooling tower outfall sewer of handpiece Water Chilling Units 400
Degree, its leaving water temperature for representing cooling tower)；On cooling water return main between handpiece Water Chilling Units 400 and cooling tower group 200 also
Second temperature sensor 502 can be provided with, for measuring cold side supply water temperature (namely the cooling tower of handpiece Water Chilling Units 400
Inflow temperature).It should be noted that control method of the invention and cold side supply water temperature need not be measured.
In view of the inaccuracy of outdoor wet-bulb temperature measurement, the present invention proposes a kind of central air conditioner system cooling tower and goes out
The control method of coolant-temperature gage, it eliminates the measurement to outdoor wet-bulb temperature, but the platform by controlling cooling tower to put into operation
Number of units and/or frequency, the platform of cooling water pump of number (specially controlling the valve of cooling tower Inlet and outlet water both sides) and blower fan of cooling tower
Number etc., and monitor the temperature of cooling tower outfall sewer and carry out feedback control, so as to can reach optimal geomantic omen ratio so that cooling tower
Leaving water temperature can reach or close to outdoor wet-bulb temperature, and it (or is from seeking central air conditioner system is had from wet-bulb temperature is sought
It is excellent) characteristic.
Specifically, as shown in Fig. 2 the control method of central air conditioner system cooling tower leaving water temperature of the invention includes step
Suddenly：The control device 100 by the quantity that controls cooling tower to put into operation, and/or control blower fan of cooling tower operation number of units
And/or frequency is reached realizing cooling tower leaving water temperature or close to outdoor wet-bulb temperature.
The inflow temperature of cooling tower is determined by the operating condition of air-conditioner set, and the leaving water temperature of cooling tower is by cold
But the conditional decision such as performance (such as air quantity, filler etc.), outdoor temperature humidity, inflow temperature, flow of tower.The present invention is by regulation
The number of units and/or frequency of quantity that cooling tower puts into operation, control blower fan, i.e., by control the geomantic omen of cooling system than side
Formula, water-carrying capacity stablize it is constant on the premise of, with the change of the load variations and outdoor environment humiture of air-conditioner set, can
Cooling tower is allowed with energy-conservation the most, simple mode, and cooling tower leaving water temperature is tried one's best reduction.
Preferably, the quantity that the quantity of cooling water pump operation is run with handpiece Water Chilling Units is consistent.For example：3 cooling waters
3 handpiece Water Chilling Units of pump correspondence, 2 cooling water pump 2 handpiece Water Chilling Units of correspondence.Because the cooling water channel of system is generally open type system
System, water-carrying capacity is substantially corresponding with handpiece Water Chilling Units flow, if the quantity of cooling water pump operation is more than the quantity that handpiece Water Chilling Units are run,
Then cooling tower has the possibility sprayed water outward；If the quantity of cooling water pump operation is fewer than the quantity that handpiece Water Chilling Units are run, cold
Water dispenser group is possible to all report water flow switch to protect.Therefore the operation quantity of cooling water pump preferably keeps with the quantity of handpiece Water Chilling Units
Unanimously.
Shown in preferred specific control flow Fig. 3 of control method of the invention.
Preferably, when central air conditioner system starts, it is necessary first to open cooling tower passage, namely need to throw cooling tower
Enter operation, therefore, the control device 100 control cooling tower put into operation quantity the step of include：
Quantity according to the cooling water pump of actual motion in the cooling pump group determines the quantity that cooling tower puts into operation, really
Determining principle is：The quantity that cooling tower puts into operation is the smallest positive integral of quantity × 1.5 run more than or equal to cooling water pump.
That is, upon power-up of the system, by the principle of minimum run time, the quantity for determining as follows opens cooling tower
Passage (opening the valves of cooling tower Inlet and outlet water both sides)：
Quantity × 1.5 of the quantity that cooling tower puts into operation=cooling water pump operation, due to the number that cooling tower puts into operation
Amount can only be integer and can not be decimal, therefore should round up, as long as that is, there is decimal place after decimal point, then upward carry,
Round the integer that numerical digit plus 1 and obtained.
Such as, 1 cooling water pump 2 cooling tower of correspondence, 2 cooling water pump 3 cooling towers of correspondence, 3 cooling water pump correspondences 5
Platform cooling tower, the like.It is to be noted that, because the maximum number of cooling tower in system is n platforms, therefore, n platform cooling waters
Pump is finally likely to correspondence n platform cooling towers.
By above-mentioned control mode, can be dropped to cooling circulating water with most fast speed when central air conditioner system is opened
Temperature, and by water temperature stability in an ideal value.
Preferably, during central air conditioner system is run, the quantity that the control cooling tower of the control device 100 puts into operation
The step of include：
Make the quantity that cooling tower puts into operation between maximum and minimum value, wherein, cooling tower puts into operation quantity
Maximum be quantity × 1.5 run more than or equal to cooling water pump smallest positive integral, cooling tower puts into operation the minimum of quantity
Quantity of the value equal to cooling water pump operation.
The maximum of quantity=cooling water pump operation quantity × 1.5 that is, cooling tower puts into operation, and round up (
That is, as long as there is decimal place after decimal point, then upward carry rounds the integer that numerical digit plus 1 and obtained).For example, 1 cooling water pump
At most corresponding 2 cooling towers, 2 at most corresponding 3 cooling towers of cooling water pump, 3 cooling water pump 5 cooling towers of most correspondences,
The like.It is to be noted that, because the maximum number of cooling tower in system is n platforms, therefore, n platforms cooling water pump is at most
N platform cooling tower passages can only be corresponded to.
The quantity that the cooling tower determined according to above-mentioned maximum and minimum value puts into operation, the geomantic omen ratio of the cooling tower for obtaining
It is able to ensure that the heat-sinking capability of cooling tower is strong, system operation compares more efficient.
Preferably, during central air conditioner system is run, the quantity that the control cooling tower of the control device 100 puts into operation
The step of also include：
Judge whether to need to reduce by an operation for cooling tower, if desired, then close accumulated running time cooling most long
Tower；
And/or, judge whether to need to increase an operation for cooling tower, if desired, then open accumulated running time most short
Cooling tower.
That is, during central air conditioner system is run, control device 100 can judge whether to need to close (to subtract at any time
One or passage for cooling tower of unlatching (increasing) less), if desired, then correspondingly turn off or on a cooling tower.Tool
Body ground, when needing to close a cooling tower, then closes accumulated running time that cooling tower most long, and preferably also simultaneously
Close the blower fan of the cooling tower；When needing to open a cooling tower, then accumulated running time most short that cooling tower is opened,
And it is preferred that the blower fan of the cooling tower is also opened simultaneously.
Accumulated running time on cooling tower, the aggregate-value of the fan operation time of the cooling tower is referred to, work as blower fan
During operation, then run time is added up, and when blower fan stops, then run time stops accumulative, but run time before this is not
Can reset.The accumulated running time of cooling tower for example can be in units of hour, and precision is, for example, 0.1 hour.
Preferably, when any one of following condition C 01-C04 meets, the control device 100 is judged as that needs subtract
A few operation for cooling tower：
The quantity of the quantity ＞ cooling water pumps operation that C01, cooling tower put into operation；
C02, add tower in previous cooling tower or subtract the feelings of cumulative time >=the first prefixed time interval after tower flow terminates
Under condition, if continuously meeting in the first preset duration t1：The default temperature drop rate of temperature drop rate≤the first of cooling tower outfall sewer；
Temperature≤the first desired temperature of C03, cooling tower outfall sewer；
C04, cooling tower the quantity ＞ cooling towers that put into operation put into operation the maximum of quantity；
Wherein, the setting meaning of condition C 01 is that, when there is handpiece Water Chilling Units to close, correspondingly can also close cooling water pump,
Thus the quantity for causing cooling water pump to run is reduced, when the quantity of cooling water pump operation is less than the quantity that cooling tower puts into operation
When, then need to reduce by an operation for cooling tower.
In condition C 02, the first prefixed time interval may be defined as cooling tower plus-minus tower time interval, and the principle of setting should
For：When adding tower or subtract after tower flow terminates the cumulative time and be more than the time interval in previous cooling tower, cooling tower goes out water temperature
Degree has reached stabilization, carries out subsequent adjustment after stable in outlet water temperature again just meaningful.First prefixed time interval is preferably 5~
20 minutes, more preferably 15 minutes.The setting meaning of condition C 02 is, when the leaving water temperature of cooling tower no longer declines, can taste
Examination is closed a cooling tower and checks whether leaving water temperature raises；If water temperature is not raised after closing, illustrate that the cooling tower goes out water temperature
Degree is close to wet-bulb temperature critical value.Wherein, the first preset duration t1 is preferably 60~180 seconds, more preferably
120 seconds；Described first default temperature drop rate is preferably 0.1~0.2 DEG C/min, more preferably 0.1 DEG C/min, and preferably every
The temperature drop rate for calculating primary cooling tower outfall sewer in 10 seconds.
In condition C 03, first desired temperature is 18-20 DEG C, for example, being the field of screw machine for handpiece Water Chilling Units
Close, the first desired temperature is preferably 20 DEG C, be the occasion of centrifuge for handpiece Water Chilling Units, the first desired temperature is preferably 18
℃.The setting meaning of the condition C 03 is that the minimum temperature of cooling tower water outlet must meet the cooling water temperature requirement of unit, because
For cooling water temperature is too low, unit may report high voltage protective, therefore cooling tower leaving water temperature should be prevented too low.
In condition C 04, cooling tower put into operation quantity maximum for current cooling water pump run quantity × 1.5, and to
On round.Because the operation quantity of cooling water pump can be adjusted according to the operating mode of system, therefore, the maximum of cooling tower passage is opened
Open the actual motion quantity that quantity (namely cooling tower put into operation the maximum of quantity) should be all the time to cooling water pump related.
Preferably, when any one of following condition C 11-C13 meets, the control device 100 is judged as needing to increase
Plus an operation for cooling tower：
C11, add tower in previous cooling tower or subtract the feelings of cumulative time >=the first prefixed time interval after tower flow terminates
Under condition, if continuously meeting in the second preset duration t2：The default temperature rise rate of temperature rise rate >=the first of cooling tower outfall sewer；
Temperature >=second temperature the setting value of C12, cooling tower outfall sewer；
The quantity of the quantity ＜ cooling water pumps operation that C13, cooling tower put into operation.
Wherein, the setting meaning of condition C 11 is that, if water temperature rises, deviate from outdoor wet-bulb temperature value, then increase by one
Cooling tower passage, to reduce temperature.Specifically, the meaning of the first prefixed time interval is the same, and the second preset duration t2 is preferably
60~180 seconds, more preferably 120 seconds, the first default temperature rise rate was preferably 0.1~0.2 DEG C/min, more preferably 0.2 DEG C/
Minute, and calculate within preferably every 10 seconds the temperature rise rate of primary cooling tower outfall sewer.
The setting meaning of condition C 12 is, if water temperature over-high, unit efficiency declines, it is therefore desirable to plus a cooling tower
Passage, to reduce temperature.Specifically, the second temperature setting value is preferably 28~32 DEG C, more preferably 30 DEG C.
The setting meaning of condition C 13 is that the quantity that cooling tower puts into operation is too small (being less than its minimum value), causes cooling
The heat-sinking capability of tower declines, it is therefore desirable to increase a cooling tower passage, to reduce temperature.
When in one cooling tower of closing in the case of meeting above-mentioned condition or increase, can guarantee that water temperature change is more steady
It is fixed, and close outdoor wet-bulb temperature.
Preferably, control method of the invention also includes being controlled the number of units of blower fan of cooling tower, specifically includes step：
During central air conditioner system is run, if continuously meeting in the 3rd preset duration t3：Cooling tower outfall sewer
Temperature >=the 3rd desired temperature, then open the blower fan of all cooling towers for putting into operation；
And/or, during central air conditioner system is run, when all cooling water pumps are to close, or, if default the 6th
Continuously meet in duration t6：The desired temperatures of temperature ＜ the 6th of cooling tower outfall sewer, then close the wind of all of cooling tower
Machine.
That is, when system blower fan of cooling tower runs, if the temperature of cooling tower outfall sewer >=the 3rd desired temperature is (excellent
Elect 20~24 DEG C as, more preferably 24 DEG C, because 24 DEG C are relatively reasonable blower fans and start point) when, and in the 3rd preset duration
When continuously meeting in t3 (preferably 30~90 seconds, more preferably 60 seconds), then the blower fan of cooling tower that all passages have been opened is opened,
No matter each blower fan of cooling tower is frequency conversion fan or determines frequency blower fan.
And during central air conditioner system is run, when all cooling water pumps are to close, then all cooling towers are closed immediately
Blower fan, to avoid waste of energy.Or, the desired temperatures of temperature ＜ the 6th of cooling tower outfall sewer (may be defined as unit cold
But return water temperature protection value, more preferably preferably 14~20 DEG C, 18 DEG C), and in the 6th preset duration t6 (preferably 5~30
Second, more preferably 20 seconds) in it is continuous when meeting, all blower fans are also switched off, so as to protect handpiece Water Chilling Units, it is to avoid water temperature is too low to be caused
Unit report high voltage protective.
Preferably, the step of number of units and/or frequency of the operation of the control of the control device 100 blower fan of cooling tower includes：
If blower fan of cooling tower adjusts the number of units of the fan operation of the cooling tower for putting into operation to determine frequency blower fan；
If blower fan of cooling tower is frequency conversion fan, the frequency of the blower fan of all cooling towers for putting into operation is adjusted in synchronism, and
It is preferred that the control of blower fan number of units can not be related to these blower fans with opening with pass.
That is, when blower fan of cooling tower is to determine frequency blower fan, suitable wind can be realized by controlling the number of units of fan operation
Water ratio；And if when blower fan of cooling tower is frequency conversion fan, suitable geomantic omen can be realized by controlling the running frequency of blower fan
Than, it is not necessary to change the number of units of fan operation.
Wrapped preferably for the step of determining frequency blower fan, the number of units of the adjustment blower fan of cooling tower operation of the control device 100
Include：
Judge whether to need to increase an operation for blower fan of cooling tower, if desired, then open accumulated running time most short
Blower fan of cooling tower；
And/or, judge whether to need to reduce by an operation for blower fan of cooling tower, if desired, then close accumulated running time
Blower fan of cooling tower most long, but should ensure that at least remaining Fans operation.
Specifically, for determining frequency blower fan, when following condition Cs 21 are met, the control device 100 is judged as needing to increase
Plus an operation for blower fan of cooling tower：
C21, continuously meet in the 4th preset duration t4 (preferably 30~90 seconds, more preferably 60 seconds)：Cooling tower goes out
The temperature of supply mains >=the 4th desired temperature (preferably 24~28 DEG C, more preferably 26 DEG C).
When following condition Cs 22 are met, the control device 100 is judged as needing to reduce by a fortune for blower fan of cooling tower
OK：
C22, continuously meet in the 5th preset duration t5 (preferably 30~90 seconds, more preferably 60 seconds)：6th temperature
The temperature of setting value≤cooling tower outfall sewer≤the 5th desired temperature (preferably 20~24 DEG C, more preferably 22 DEG C).Its
In the 6th design temperature with it is hereinbefore consistent, be unit cooling backwater temperature protection value, preferably 14~20 DEG C, more preferably 18
℃。
In other cases, the operation number of units of blower fan of cooling tower keeps constant.
Added by above-mentioned blower fan, Control of decreasing load, can try one's best by cooling tower leaving water temperature control between 22~26 DEG C.
Include preferably for frequency conversion fan, the step of the control device 100 is adjusted in synchronism the frequency of all blower fans：
If continuously meeting in the 7th preset duration t7 (preferably 5~30 seconds, more preferably 10 seconds)：Cooling tower water outlet is total
The temperature of pipe >=the 7th desired temperature (preferably 28~30 DEG C, more preferably 28 DEG C), then raise the frequency of all blower fans
F1；
If continuously meeting in the 7th preset duration t7 (preferably 5~30 seconds, more preferably 10 seconds)：8th temperature sets
It is worth the desired temperatures of temperature ＜ the 7th of (preferably 26~28 DEG C, more preferably 26 DEG C)≤cooling tower outfall sewer (preferably
28~30 DEG C, more preferably 28 DEG C), then the frequency of all blower fans is raised into F2, wherein, F2 ＜ F1；For example, F1=2~8Hz,
F2=0.5~2Hz, it is preferable that F1=5Hz；F2=2Hz.
Controlled by above-mentioned raising frequency, can tried one's best the control of cooling tower leaving water temperature between 20~28 DEG C.
If continuously meeting in the 8th preset duration t8 (preferably 5~30 seconds, more preferably 20 seconds)：9th temperature sets
It is worth the desired temperatures of temperature ＜ the tenth of (preferably 14~19 DEG C, more preferably 19 DEG C)≤cooling tower outfall sewer (preferably
20~24 DEG C, more preferably 22 DEG C), then by the frequency reduction F3 of all blower fans；
If continuously meeting in the 8th preset duration t8 (preferably 5~30 seconds, more preferably 20 seconds)：11st temperature sets
The desired temperatures of temperature ＜ the 9th of definite value (preferably 14~19 DEG C, more preferably 18 DEG C)≤cooling tower outfall sewer are (preferably
It is 14~19 DEG C, more preferably 19 DEG C), then by the frequency reduction F4 of all blower fans, wherein, F3 ＜ F4；For example, F3=0.5~
2Hz, F4=2~8Hz, it is preferable that F3=2Hz；F4=5Hz.
Controlled by above-mentioned frequency reducing, can tried one's best the control of cooling tower leaving water temperature between 20~28 DEG C.
The frequency of blower fan is not adjusted in the case of other then.
To sum up, contrast is in the prior art using " method for installing outdoor temperature humidity sensor ", control method of the invention
Control cooling tower leaving water temperature is relatively reliable, and need not install outdoor temperature humidity sensor, because the present invention dissipating by water temperature
Thermal characteristics and geomantic omen than method, cooling tower leaving water temperature on the premise of more energy-conservation can be allowed to be constantly in lower limit temperature attached
Closely, so as to allow handpiece Water Chilling Units more energy-conservation.
Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each preferred scheme can be free
Ground combination, superposition.
It should be appreciated that above-mentioned implementation method is only illustrative, and not restrictive, without departing from of the invention basic
In the case of principle, various obvious or equivalent modification or replace that those skilled in the art can make for above-mentioned details
Change, be all included in scope of the presently claimed invention.
Claims (15)
1. a kind of control method of central air conditioner system cooling tower leaving water temperature, the central air conditioner system include control device,
Cooling tower group, cooling pump group and handpiece Water Chilling Units, the entrance side of the cooling pump group connects the water tank side of the cooling tower group, described
The outlet side for cooling down pump group connects the cold side water inlet of the handpiece Water Chilling Units, the cold side delivery port connection of the handpiece Water Chilling Units
The spray side of the cooling tower group, the control device is connected with the cooling tower group, the cooling pump group；Characterized in that,
The control method includes step：The control device is by the quantity that controls cooling tower to put into operation, and/or control cooling tower
The number of units and/or frequency of fan operation are reached realizing cooling tower leaving water temperature or close to outdoor wet-bulb temperature.
2. control method according to claim 1, it is characterised in that when central air conditioner system starts, the control dress
The step of putting the quantity for controlling cooling tower to put into operation includes：
Quantity according to the cooling water pump of actual motion in the cooling pump group determines the quantity that cooling tower puts into operation.
3. control method according to claim 2, it is characterised in that determine the principle of the quantity that cooling tower puts into operation
For：The quantity that cooling tower puts into operation is the smallest positive integral of quantity × 1.5 run more than or equal to cooling water pump.
4. control method according to claim 1, it is characterised in that during central air conditioner system is run, the control
The step of quantity that device control cooling tower puts into operation, includes：
Make the quantity that cooling tower puts into operation between maximum and minimum value, wherein, cooling tower puts quantity into operation most
Big value is the smallest positive integral of quantity × 1.5 more than or equal to cooling water pump operation, and cooling tower puts into operation the minimum value etc. of quantity
In the quantity of cooling water pump operation.
5. control method according to claim 4, it is characterised in that during central air conditioner system is run, the control
The step of quantity that device control cooling tower puts into operation, also includes：
Judge whether to need to reduce by an operation for cooling tower, if desired, then close accumulated running time cooling tower most long；
And/or, judge whether to need to increase an operation for cooling tower, if desired, then open accumulated running time most short cold
But tower.
6. control method according to claim 5, it is characterised in that
When any one of following condition C 01-C04 meets, the control device is to be judged as needing to reduce by a cooling tower
Operation：
The quantity of the quantity ＞ cooling water pumps that C01, cooling tower put into operation；
C02, in Jia Ta or when subtracting cumulative time >=the first prefixed time interval after tower flow terminates, if in the first preset duration t1
Interior continuous satisfaction：The default temperature drop rate of temperature drop rate≤the first of cooling tower outfall sewer；
Temperature≤the first desired temperature of C03, cooling tower outfall sewer；
C04, cooling tower the quantity ＞ cooling towers that put into operation put into operation the maximum of quantity；
And/or,
When any one of following condition C 11-C13 meets, the control device is to be judged as needing to increase a cooling tower
Operation：
C11, in Jia Ta or when subtracting cumulative time >=the first prefixed time interval after tower flow terminates, if in the second preset duration t2
Interior continuous satisfaction：The default temperature rise rate of temperature rise rate >=the first of cooling tower outfall sewer；
Temperature >=second temperature the setting value of C12, cooling tower outfall sewer；
The quantity of the quantity ＜ cooling water pumps operation that C13, cooling tower put into operation.
7. control method according to claim 6, it is characterised in that
First prefixed time interval is 5~20 minutes；
And/or, the first preset duration t1 is 60~180 seconds；
And/or, the described first default temperature drop rate is 0.1~0.2 DEG C/min；
And/or, first desired temperature is 18-20 DEG C；
And/or, the second preset duration t2 is 60~180 seconds；
And/or, the described first default temperature rise rate is 0.1~0.2 DEG C/min；
And/or, the second temperature setting value is 28~32 DEG C.
8. control method according to claim 1, it is characterised in that also including step：
During central air conditioner system is run, if continuously meeting in the 3rd preset duration t3：The temperature of cooling tower outfall sewer
>=the three desired temperature, then open the blower fan of all cooling towers for putting into operation；
And/or, during central air conditioner system is run, when all cooling water pumps are to close, or, if in the 6th preset duration
Continuously meet in t6：The desired temperatures of temperature ＜ the 6th of cooling tower outfall sewer, then close the blower fan of all of cooling tower.
9. control method according to claim 8, it is characterised in that
The 3rd preset duration t3 is 30~90 seconds；
And/or, the 3rd desired temperature is 20~24 DEG C；
And/or, the 6th preset duration t6 is 5~30 seconds；
And/or, the 6th desired temperature is 14~20 DEG C.
10. according to the control method that one of claim 1-9 is described, it is characterised in that the control device controls cooling tower wind
The step of number of units and/or frequency of machine operation, includes：
If blower fan of cooling tower adjusts the number of units of the fan operation of the cooling tower for putting into operation to determine frequency blower fan；
If blower fan of cooling tower is frequency conversion fan, the frequency of the blower fan of all cooling towers for putting into operation is adjusted in synchronism.
11. control methods according to claim 10, it is characterised in that for determining frequency blower fan, the control device adjustment
The step of number of units of blower fan of cooling tower operation, includes：
Judge whether to need to increase an operation for blower fan of cooling tower, if desired, then open accumulated running time most short cooling
Tower blower fan；
And/or, judge whether to need to reduce by an operation for blower fan of cooling tower, if desired, then close accumulated running time most long
Blower fan of cooling tower.
12. control methods according to claim 11, it is characterised in that
When following condition Cs 21 are met, the control device is to be judged as needing to increase an operation for blower fan of cooling tower：
C21, continuously meet in the 4th preset duration t4：The temperature of cooling tower outfall sewer >=the 4th desired temperature；
And/or, when following condition Cs 22 are met, the control device is to be judged as needing to reduce by a fortune for blower fan of cooling tower
OK：
C22, continuously meet in the 5th preset duration t5：Temperature≤the 5th of six desired temperatures≤cooling tower outfall sewer
Desired temperature.
13. control methods according to claim 12, it is characterised in that
The 4th preset duration t4 is 30~90 seconds；
And/or, the 4th desired temperature is 24~28 DEG C；
And/or, the 5th preset duration t5 is 30~90 seconds；
And/or, the 5th desired temperature is 20~24 DEG C；
And/or, the 6th desired temperature is 14~20 DEG C.
14. control methods according to claim 10, it is characterised in that for frequency conversion fan, the control device synchronization
The step of frequency for adjusting all blower fans, includes：
If continuously meeting in the 7th preset duration t7：The temperature of cooling tower outfall sewer >=the 7th desired temperature, then by institute
The frequency for having blower fan raises F1；
If continuously meeting in the 7th preset duration t7：The temperature of temperature ＜ the 7th of eight desired temperatures≤cooling tower outfall sewer
Degree setting value, then raise F2 by the frequency of all blower fans, wherein, F2 ＜ F1；
And/or,
If continuously meeting in the 8th preset duration t8：The temperature of temperature ＜ the tenth of nine desired temperatures≤cooling tower outfall sewer
Degree setting value, then by the frequency reduction F3 of all blower fans；
If continuously meeting in the 8th preset duration t8：The temperature ＜ the 9th of 11 desired temperatures≤cooling tower outfall sewer
Desired temperature, then by the frequency reduction F4 of all blower fans, wherein, F3 ＜ F4.
15. control methods according to claim 14, it is characterised in that
The 7th preset duration t7 is 5~30 seconds；
And/or, the 7th desired temperature is 28~30 DEG C；
And/or, the 8th desired temperature is 26~28 DEG C.
And/or, F1=2~8Hz；
And/or, F2=0.5~2Hz；
And/or, the 8th preset duration t8 is 5~30 seconds；
And/or, the 9th desired temperature is 14~19 DEG C；
And/or, the tenth desired temperature is 20~24 DEG C.
And/or, the 11st desired temperature is 14~19 DEG C；
And/or, F3=0.5~2Hz；
And/or, F4=2~8Hz.
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