CN104214903B - Air conditioner cooling tower group control method based on half-closed space - Google Patents
Air conditioner cooling tower group control method based on half-closed space Download PDFInfo
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- CN104214903B CN104214903B CN201410512045.7A CN201410512045A CN104214903B CN 104214903 B CN104214903 B CN 104214903B CN 201410512045 A CN201410512045 A CN 201410512045A CN 104214903 B CN104214903 B CN 104214903B
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Abstract
The invention discloses a kind of air conditioner cooling tower group control method based on half-closed space, comprise the following steps：1）Set up physical model；2）Mesh generation is carried out to physical model and sets up grid model；3）Set the model parameter and variable parameter of numerical simulation air flow method；4）Preset each cooling tower negative pressure；5）The boundary condition and primary condition of setup algorithm；6）Initialization is calculated, numerical simulation calculation is carried out using finite volume method, numerical simulation calculation result is obtained；7）Extract and count each cooling tower intake, when calculating intake more than specified intake, the default negative pressure of reduction, when calculating intake is less than specified intake, the default negative pressure of raising；8）Resume at step 5）, when calculating intake equal to specified intake, into step 9）；9）Calculate the pressure drop of whole air flow stroke；10）Selected blower fan of cooling tower model.This method can avoid cooling tower intake skewness, be convenient for blower fan of cooling tower type selecting.
Description
Technical field
The invention mainly relates to field of heating ventilation air conditioning, more particularly to a kind of air conditioner cooling tower team control based on half-closed space
Method processed.
Background technology
Cooling tower is the important component of heating ventilation air-conditioning system, its act on be by carry waste heat recirculated water Ta Nei with
Air carry out heat exchange, water heat transmission is to air and spills into air, recirculated water is cooled.Cooling tower runnability
Quality directly affect the effect of air-conditioning system cooling and warming.
Influenceing the factor of cooling tower runnability includes air's wet bulb temperature, air mass flow, water, the arrangement of cooling tower
Deng wherein the position of cooling tower and mode are to influence one of cooling tower runnability quality very crucial factor.Cooling
Tower once arranges unreasonable, will cause damp-heat air back-mixing, so as to drastically influence cooling tower runnability.So, in order to drop
Low cooling tower damp-heat air back-mixing, cooling tower generally places draughty outdoor, such as roof or ground, and require exhaust outlet,
Air inlet is unobstructed.
However, cooling tower is positioned over roof or ground, will produce very big noise influences building overall appearance simultaneously.In recent years
Come, people are to urban environment growing interest, and cooling tower is placed in the refrigerating plant room or building of special outer wall more and more
In the space that conversion layer etc. is relatively closed；In addition with the increase of single building construction area, the quantity of required cooling tower
It is more and more.When substantial amounts of cooling tower is disposed in a half-closed space, it will result in close to half-closed space air inlet
Cooling tower intake it is excessive, and occupy that the cooling tower intake in the middle part of half-closed space is too small, blower fan of cooling tower type selecting is difficult to
It is determined that, cooling tower operational efficiency is low.These problems cause cooling tower can not be in Effec-tive Function under declared working condition, so as to directly affect
The effect of whole air-conditioning system cooling and warming.
At present, outdoor cooling tower arrangement is simple is carried out by engineering experience, and obtains good cooling effect.But for
If the arrangement of Cooling Towers is arranged and using outdoor Cooling Towers merely by engineering experience in half-closed space
Layout design method, it will make part cooling tower runnability deterioration, so that whole heat pump performance operational effect is influenceed, therefore must
The prioritization scheme of Cooling Towers arrangement and raising Cooling Towers runnability in another half-closed space must be found.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art to be avoided close to half-closed sky there is provided one kind
Between air inlet cooling tower intake is excessive, cooling tower intake that is occuping in the middle part of half-closed space is too small, be convenient for cooling
The air conditioner cooling tower group control method based on half-closed space of tower Fan Selection.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of air conditioner cooling tower group control method based on half-closed space, comprises the following steps：
1）Built according to the physical dimension in the half-closed space, the arrangement of air conditioner cooling tower group and physical dimension
Be based on half-closed space air conditioner cooling tower group physical model；
2）Mesh generation is carried out to the physical model and sets up grid model；
3）Set the model parameter and variable parameter of half-closed space interior air-flow distribution described in numerical simulation, the model ginseng
Number includes airflow patterns parameter at turbulence model parameter and cooling tower, and the variable parameter includes discrete pressure parameter, gas
Flow speed parameter, tubulence energy parameter and tubulence energy dissipative shock wave parameter；
4）Preset each cooling tower negative pressure；
5）The boundary condition and primary condition of setup algorithm；
6）The calculating is initialized, numerical simulation calculation is carried out using finite volume method, numerical simulation meter is obtained
Calculate result；
7）Extract and count each cooling tower intake, enter when the cooling tower intake obtained by calculating is specified more than the cooling tower
During air quantity, then the default negative pressure of the cooling tower is reduced, when the cooling tower intake obtained by calculating is less than the specified air intake of the cooling tower
During amount, then the default negative pressure of the cooling tower is improved；
8）Return to step 5）, when cooling tower intake is equal to the specified air intake of the cooling tower obtained by the calculating of each cooling tower
During amount, into step 9）；
9）The vertical ventilating shaft entrance in the half-closed space is calculated to the pressure drop of each cooling tower, each cooling tower internal drop and
Each cooling tower is exported to the pressure drop of cooling tower air exhaust box outlet, obtains from the vertical ventilating shaft entrance by each cooling tower to cooling
Tower air exhaust box exports the pressure drop of whole air flow stroke；
10）Blower fan of cooling tower model is selected according to cooling tower intake and pressure drop.
It is used as the further improvement of above-mentioned technical proposal：
The model parameter is also included at cooling tower air-discharge silencer at airflow patterns parameter and cooling tower demister
Airflow patterns parameter.
Airflow patterns parameter at cooling tower, airflow patterns parameter and cooling tower are removed at cooling tower air-discharge silencer
Airflow patterns parameter is set as porous media region parameter of a flow model at day with fog.
Carrying out step 2）When, mixed with tetrahedral grid with hexahedral mesh and grid stroke is carried out to the physical model
Point.
Carrying out step 3）When, the turbulence model parameter uses k-e two-equation models.
Carrying out step 3）When, the discrete pressure parameter, air velocity parameter discrete use Second-order Up-wind form.
Carrying out step 5）When, the inlet set of the vertical ventilating shaft is atmospheric pressure boundary condition, the cooling tower
Air intake is set as negative pressure boundary condition, and the cooling tower air exhaust box outlet is set as atmospheric pressure boundary condition, described half
It is set as at each wall in enclosed space without sliding wall boundary condition.
Air conditioner cooling tower group's physical model based on half-closed space includes half-closed space, vertical ventilating shaft, cooling
Tower, cooling tower exhaust duct, cooling tower air exhaust box, cooling tower air-discharge silencer, cooling tower demister, water main and backwater are total
Pipe.
Compared with prior art, the advantage of the invention is that：
The air conditioner cooling tower group control method based on half-closed space of the present invention, using Fluid Mechanics Computation method numerical value
Half-closed space interior air-flow distribution is simulated, cooling tower intake is optimized, can be avoided close to half-closed space air inlet
Cooling tower intake is excessive and to occupy the cooling tower intake in the middle part of half-closed space too small, so that cooling tower intake is all
Reach specified intake, it is ensured that cooling tower is efficiently run under specified operating mode；Meanwhile, cooling tower intake and pressure drop are selected
Blower fan of cooling tower model, it is to avoid blindly carry out blower fan of cooling tower type selecting.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the air conditioner cooling tower group control method of the invention based on half-closed space.
Fig. 2 is the structural representation of the air conditioner cooling tower group control method application example of the invention based on half-closed space.
Each label is represented in figure：
1st, half-closed space；11st, vertical ventilating shaft；2nd, cooling tower；21st, cooling tower exhaust duct；22nd, cooling tower air exhaust box；23、
Cooling tower air-discharge silencer；24th, cooling tower demister；3rd, water main；4th, return main.
Embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
Figures 1 and 2 show that the air conditioner cooling tower group control embodiment of the method based on half-closed space of the present invention, the party
Method comprises the following steps：
1）Set up and be based on according to the physical dimension in half-closed space 1, the arrangement of air conditioner cooling tower group and physical dimension
Air conditioner cooling tower group's physical model in half-closed space, is modeled using Solidwork 3D sculpting softwares, generates STEP files；
2）Mesh generation is carried out to physical model using ICEM CFD softwares and sets up grid model, msh files are generated；
3）Read in ANSYS FLUENT softwares described three-dimensional grid model and with the software set numerical simulation partly
The model parameter and variable parameter of the interior air-flow distribution of enclosed space 1, model parameter includes empty at turbulence model parameter and cooling tower 2
Flow of air model parameter, variable parameter includes discrete pressure parameter, air velocity parameter, tubulence energy parameter and tubulence energy dissipative shock wave
Parameter；
4）Each negative pressure of cooling tower 2 is preset, the present embodiment is set to -140Pa；
5）The boundary condition and primary condition of setup algorithm；
6）Calculating is initialized, numerical simulation calculation is carried out using finite volume method, numerical simulation calculation knot is obtained
Really；
7）Extract and count each intake of cooling tower 2, when the cooling tower intake obtained by calculating is specified more than the cooling tower 2
During intake, then the default negative pressure of the cooling tower 2 is reduced, entered when the cooling tower intake obtained by calculating is specified less than the cooling tower
During air quantity, then the default negative pressure of the cooling tower 2 is improved；
8）Return to step 5）, enter when cooling tower intake obtained by the calculating of each cooling tower 2 is specified equal to the cooling tower
During air quantity, into step 9）；
9）The entrance of vertical ventilating shaft 11 in half-closed space 1 is calculated to the pressure drop of each cooling tower 2, each internal drop of cooling tower 2 with
And each cooling tower 2 be exported to cooling tower air exhaust box 22 outlet pressure drop, obtain from the vertical entrance of ventilating shaft 11 by each cooling tower 2 to
Cooling tower air exhaust box 22 exports the pressure drop of whole air flow stroke；
10）Blower fan of cooling tower model is selected according to cooling tower intake and pressure drop.
The air conditioner cooling tower group control method based on half-closed space of the present invention, using Fluid Mechanics Computation method numerical value
The half-closed interior air-flow of space 1 distribution is simulated, cooling tower intake is optimized, can be avoided close to the half-closed air inlet of space 1
The intake of cooling tower 2 it is excessive and to occupy the intake of cooling tower 2 at the middle part of half-closed space 1 too small so that cooling tower air intake
Amount all reaches specified intake, it is ensured that cooling tower 2 is efficiently run under specified operating mode；Meanwhile, cooling tower intake and pressure
The selected blower fan of cooling tower model of drop, it is to avoid blindly carry out blower fan of cooling tower type selecting.
In the present embodiment, air conditioner cooling tower group's physical model based on half-closed space includes half-closed space 1, vertical wind
Well 11, cooling tower 2, cooling tower exhaust duct 21, cooling tower air exhaust box 22, cooling tower air-discharge silencer 23, cooling tower demister 24,
Water main 3 and return main 4.
In the present embodiment, model parameter also includes airflow patterns parameter and cooling tower at cooling tower air-discharge silencer 23
Airflow patterns parameter at airflow patterns parameter at demister 24, cooling tower 2, air at cooling tower air-discharge silencer 23
Airflow patterns parameter is set as porous media region flow model ginseng at parameter of a flow model and cooling tower demister 24
Number.
In the present embodiment, step 2 is being carried out）When, mixed with tetrahedral grid with hexahedral mesh and physical model is carried out
Mesh generation.
In the present embodiment, step 3 is being carried out）When, turbulence model parameter use k-e two-equation models, discrete pressure parameter,
Air velocity parameter discrete uses Second-order Up-wind form.
In the present embodiment, step 5 is being carried out）When, the inlet set of vertical ventilating shaft 11 is atmospheric pressure boundary condition, cooling
The air intake of tower 2 is set as negative pressure boundary condition, and the outlet of cooling tower air exhaust box 22 is set as atmospheric pressure boundary condition, semi-closure
It is set as at each wall in formula space 1 without sliding wall boundary condition.
In the present embodiment, 13 cooling towers 2 are set altogether, and it is respectively 301-313 that it, which is numbered,（As shown in Figure 2）, extract and statistics
The intake of each cooling tower 2, table 1 is each cooling tower intake obtained by calculating when setting each cooling tower negative pressure as -140Pa, from
As can be seen that each cooling tower intake is very uneven in table, close to the cooling tower intake mistake of the half-closed air inlet of space 1
Greatly, the cooling tower intake for occuping the half-closed middle part of space 1 is too small.
Table 1 assumes to calculate each cooling tower intake of gained when each cooling tower negative pressure is -140Pa（m3/h）
| 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 310 | 311 | 312 | 313 | |
| Intake | 43000 | 33000 | 42700 | 41600 | 36400 | 35300 | 35700 | 40700 | 41000 | 34900 | 35100 | 36100 | 40800 |
According to gained cooling tower intake is calculated, each negative pressure of cooling tower 2 is adjusted.When the cooling tower intake obtained by calculating is big
When cooling tower specified intake, then the negative pressure of cooling tower is reduced, reduction amplitude is 2Pa every time；When the cooling tower obtained by calculating
When intake is less than cooling tower specified intake, then cooling tower negative pressure is improved, each increase rate is 2Pa.
Cooling tower negative pressure boundary condition is reset, repetitive cycling step is calculated until each air volume cooling tower reaches specified wind
Amount.Table 2 is the intake of each cooling tower 2 obtained by final, from table 2 it can be seen that each cooling tower intake is equal after optimization
Substantially achieve cooling tower nominal air delivery.
Each cooling tower intake after the optimization design of table 2（m3/h）
| Numbering | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 310 | 311 | 312 | 313 |
| Intake | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 | 38230 |
Pass through the air-pressure drop of the whole stroke of each cooling tower after the optimization design of table 3（Pa）
| Numbering | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 310 | 311 | 312 | 313 |
| Pressure drop | 110 | 106 | 108 | 122 | 116 | 138 | 142 | 158 | 142 | 148 | 132 | 160 | 154 |
Blower fan of cooling tower model can be selected according to cooling tower intake and pressure drop, it is to avoid blindly carry out blower fan of cooling tower choosing
Type.
Although the present invention is disclosed as above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with ability
The technical staff in domain, in the case where not departing from technical solution of the present invention scope, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible variations and modification, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every
Without departing from the content of technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments,
Equivalent variations and modification, all should fall in the range of technical solution of the present invention protection.
Claims (8)
1. a kind of air conditioner cooling tower group control method based on half-closed space, it is characterised in that：Comprise the following steps：
1）According to the half-closed space（1）Physical dimension, the air conditioner cooling tower group arrangement and physical dimension build
Be based on half-closed space air conditioner cooling tower group physical model；
2）Mesh generation is carried out to the physical model and sets up grid model；
3）Set half-closed space described in numerical simulation（1）The model parameter and variable parameter of interior air-flow distribution, the model ginseng
Number includes turbulence model parameter and cooling tower（2）Locate airflow patterns parameter, the variable parameter include discrete pressure parameter,
Air velocity parameter, tubulence energy parameter and tubulence energy dissipative shock wave parameter；
4）Preset each cooling tower（2）Negative pressure；
5）The boundary condition and primary condition of setup algorithm；
6）The calculating is initialized, numerical simulation calculation is carried out using finite volume method, numerical simulation calculation knot is obtained
Really；
7）Extract and count each cooling tower（2）Intake, when the cooling tower intake obtained by calculating is more than the cooling tower（2）It is specified
During intake, then the cooling tower is reduced（2）Default negative pressure, when the cooling tower intake obtained by calculating be less than the cooling tower it is specified
During intake, then the cooling tower is improved（2）Default negative pressure；
8）Return to step 5）, when each cooling tower（2）Calculating obtained by cooling tower intake be equal to the specified air intake of the cooling tower
During amount, into step 9）；
9）Calculate the half-closed space（1）Vertical ventilating shaft（11）Entrance is to each cooling tower（2）Pressure drop, each cooling tower（2）
Internal drop and each cooling tower（2）It is exported to cooling tower air exhaust box（22）The pressure drop of outlet, is obtained from the vertical ventilating shaft（11）
Entrance passes through each cooling tower（2）To cooling tower air exhaust box（22）Export the pressure drop of whole air flow stroke；
10）Blower fan of cooling tower model is selected according to cooling tower intake and pressure drop.
2. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：It is described
Model parameter also includes cooling tower air-discharge silencer（23）Locate airflow patterns parameter and cooling tower demister（24）Locate air
Parameter of a flow model.
3. the air conditioner cooling tower group control method according to claim 2 based on half-closed space, it is characterised in that：Cooling
Tower（2）Locate airflow patterns parameter, cooling tower air-discharge silencer（23）Locate airflow patterns parameter and cooling tower demister
（24）Place's airflow patterns parameter is set as porous media region parameter of a flow model.
4. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：Entering
Row step 2）When, mixed with tetrahedral grid with hexahedral mesh and mesh generation is carried out to the physical model.
5. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：Entering
Row step 3）When, the turbulence model parameter uses k-e two-equation models.
6. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：Entering
Row step 3）When, the discrete pressure parameter, air velocity parameter discrete use Second-order Up-wind form.
7. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：Entering
Row step 5）When, the vertical ventilating shaft（11）Inlet set be atmospheric pressure boundary condition, the cooling tower（2）Air enter
Mouth is set as negative pressure boundary condition, the cooling tower air exhaust box（22）Outlet is set as atmospheric pressure boundary condition, the semi-closure
Formula space（1）Each wall at be set as without sliding wall boundary condition.
8. the air conditioner cooling tower group control method according to claim 1 based on half-closed space, it is characterised in that：It is described
Air conditioner cooling tower group's physical model based on half-closed space includes half-closed space（1）, vertical ventilating shaft（11）, cooling tower（2）、
Cooling tower exhaust duct（21）, cooling tower air exhaust box（22）, cooling tower air-discharge silencer（23）, cooling tower demister（24）, supply water
House steward（3）And return main（4）.
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| CN105240299B (en) * | 2015-11-17 | 2018-04-24 | 中国长江三峡集团公司 | Cavity Construction phase open air exhaust blower fan system and its implementation |
| CN106777542A (en) * | 2016-11-23 | 2017-05-31 | 大连理工大学 | Spring leaf propeller flow noise prediction method |
| CN108595828A (en) * | 2018-04-20 | 2018-09-28 | 广州电力机车有限公司 | The design method of dumper ventilating system |
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| CN202209894U (en) * | 2011-04-18 | 2012-05-02 | 襄樊九鼎昊天环保设备有限公司 | Atomizing cooling tower |
| CN103743289A (en) * | 2014-01-26 | 2014-04-23 | 德州贝诺风力机械设备有限公司 | Cooling tower fog dispersal and water collection device |
| CN203687243U (en) * | 2013-11-18 | 2014-07-02 | 西安工程大学 | Cooling-tower free cooling and refrigerant direct expansion air conditioning unit |
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| JP3783859B2 (en) * | 2002-07-19 | 2006-06-07 | 日立プラント建設株式会社 | Air conditioning equipment and control method thereof |
| CN101968250B (en) * | 2010-10-13 | 2012-12-05 | 濠信节能科技(上海)有限公司 | Energy-saving optimized control system and method for refrigerator room |
| CN103375878B (en) * | 2012-04-26 | 2016-07-06 | 上海宝信软件股份有限公司 | A kind of central air-conditioning freezing unit group control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202209894U (en) * | 2011-04-18 | 2012-05-02 | 襄樊九鼎昊天环保设备有限公司 | Atomizing cooling tower |
| CN203687243U (en) * | 2013-11-18 | 2014-07-02 | 西安工程大学 | Cooling-tower free cooling and refrigerant direct expansion air conditioning unit |
| CN103743289A (en) * | 2014-01-26 | 2014-04-23 | 德州贝诺风力机械设备有限公司 | Cooling tower fog dispersal and water collection device |
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