CN104214903A - Air conditioner cooling tower group control method based on semi-closed space - Google Patents
Air conditioner cooling tower group control method based on semi-closed space Download PDFInfo
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Abstract
The invention discloses an air conditioner cooling tower group control method based on a semi-closed space. The air conditioner cooling tower group control method comprises the following steps of (1) constructing an entity model; (2) performing grid division on the entity model to construct a grid model; (3) setting a model parameter and a variable parameter of value simulation air flow distribution; (4) presetting negative pressure of all cooling towers; (5) setting a boundary condition and an initial condition of calculation; (6) initializing calculation, and performing value simulation calculation by a finite volume method to obtain a value simulation calculation result; (7) extracting and counting air inlet volumes of all the cooling towers, when the calculated air inlet volumes are larger than a rated air inlet volume, reducing the preset negative pressure, and when the calculated air inlet volumes are smaller than the rated air inlet volume, increasing the preset negative pressure; (8) returning to the step (5), and when the calculated air inlet volumes are equal to the rated air inlet volume, entering step (9); (9) calculating pressure drop of the whole air flowing journey; (10) selecting the types of fans of the cooling towers. According to the method, non uniform distribution of the air inlet volumes of the cooling towers can be avoided, and the selection on the type of the fans of the cooling towers is facilitated.
Description
Technical field
The present invention relates generally to field of heating ventilation air conditioning, particularly relates to a kind of air conditioner cooling tower group control method based on half-closed space.
Background technology
Cooling tower is the important component part of heating ventilation air-conditioning system, its effect is that the recirculated water carrying waste heat is carried out heat exchange at Ta Nei and air, the delivered heat of water is spilt into air to air, lowers the temperature to recirculated water.The quality of cooling tower runnability directly affects the effect of air-conditioning system cooling and warming.
The factor affecting cooling tower runnability comprises the layout etc. of air ' s wet bulb temperature, air mass flow, the water yield, cooling tower, and wherein the position of cooling tower and mode affect one of very crucial factor of cooling tower runnability quality.Cooling tower, once arrange unreasonable, will cause damp-heat air back-mixing, thus drastically influence cooling tower runnability.So in order to reduce cooling tower damp-heat air back-mixing, draughty outdoor placed usually by cooling tower, as roof or ground, and require that exhaust outlet, air inlet are unobstructed.
But cooling tower is positioned over roof or ground, very large for generation noise is affected whole building simultaneously attractive in appearance.In recent years, people are to urban environment growing interest, and cooling tower is placed in the space that the refrigerating plant room of special outer wall or building conversion layer etc. relatively close more and more; In addition along with the increase of single building construction area, the quantity of required cooling tower gets more and more.When a large amount of cooling towers is disposed in a half-closed space, the cooling tower intake near half-closed space air inlet will be caused excessive, and the cooling tower intake occupy in the middle part of half-closed space is too small, blower fan of cooling tower type selecting is difficult to determine, cooling tower operational efficiency is low.These problems cause cooling tower at Effec-tive Function under declared working condition, thus can not directly affect the effect of whole air-conditioning system cooling and warming.
At present, outdoor cooling tower arranges that the simple engineering experience that relies on is carried out, and obtains good cooling effect.If but rely on merely engineering experience to carry out arranging and adopt outdoor Cooling Towers layout design method for the layout of Cooling Towers in half-closed space, part cooling tower runnability will be made to worsen, thus affect whole heat pump performance operational effect, therefore must find the prioritization scheme of Cooling Towers arrangement and raising Cooling Towers runnability in another half-closed space.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, thering is provided a kind of avoids the cooling tower intake cooling tower intake that is excessive, that occupy in the middle part of half-closed space near half-closed space air inlet too small, is convenient to the air conditioner cooling tower group control method based on half-closed space of carrying out blower fan of cooling tower type selecting.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
Based on the air conditioner cooling tower group control method in half-closed space, comprise the following steps:
1) the air conditioner cooling tower group physical model based on half-closed space is set up according to the physical dimension in described half-closed space, the arrangement of described air conditioner cooling tower group and physical dimension;
2) stress and strain model is carried out to described physical model and set up grid model;
3) model parameter and the variable parameter of air flow method in half-closed space described in numerical simulation is set, described model parameter comprises turbulence model parameter and cooling tower place airflow patterns parameter, and described variable parameter comprises discrete pressure parameter, air velocity parameter, tubulence energy parameter and tubulence energy dissipative shock wave parameter;
4) each cooling tower negative pressure is preset;
5) boundary condition of setup algorithm and primary condition;
6) described calculating is initialized, adopt finite volume method to carry out numerical simulation calculation, obtain numerical simulation calculation result;
7) extract and add up each cooling tower intake, when calculating the cooling tower intake of gained and being greater than the specified intake of this cooling tower, then reduce the default negative pressure of this cooling tower, when calculating the cooling tower intake of gained and being less than the specified intake of this cooling tower, then improve the default negative pressure of this cooling tower;
8) return to step 5), when the calculating gained cooling tower intake of each cooling tower equals the specified intake of this cooling tower, enter step 9);
9) pressure drop of vertical ventilating shaft entrance to each cooling tower in described half-closed space is calculated, each cooling tower internal drop and each cooling tower are exported to the pressure drop of cooling tower air exhaust box outlet, obtain the pressure drop exporting whole air flowing stroke from described vertical ventilating shaft entrance through each cooling tower to cooling tower air exhaust box;
10) blower fan of cooling tower model is selected according to cooling tower intake and pressure drop.
Further improvement as technique scheme:
Described model parameter also comprises cooling tower air-discharge silencer place airflow patterns parameter and cooling tower demister place airflow patterns parameter.
Cooling tower place airflow patterns parameter, cooling tower air-discharge silencer place airflow patterns parameter and cooling tower demister place airflow patterns parameter are all set as porous media region parameter of a flow model.
Carry out step 2) time, to mix with hexahedral mesh with tetrahedral grid and stress and strain model is carried out to described physical model.
When carrying out step 3), described turbulence model parameter adopts k-e two-equation model.
When carrying out step 3), described discrete pressure parameter, air velocity parameter discrete adopt Second-order Up-wind form.
When carrying out step 5), the inlet set of described vertical ventilating shaft is atmospheric pressure boundary condition, the air intake of described cooling tower is set as negative pressure boundary condition, described cooling tower air exhaust box outlet is set as atmospheric pressure boundary condition, and each wall place in described half-closed space is set as without slippage wall boundary condition.
The described air conditioner cooling tower group physical model based on half-closed space comprises half-closed space, vertically ventilating shaft, cooling tower, cooling tower exhaust duct, cooling tower air exhaust box, cooling tower air-discharge silencer, cooling tower demister, water main and return main.
Compared with prior art, the invention has the advantages that:
Air conditioner cooling tower group control method based on half-closed space of the present invention, adopt air flow method in the half-closed space of Fluid Mechanics Computation Method for Numerical Simulation, cooling tower intake is optimized, can avoid that the cooling tower intake near half-closed space air inlet is excessive and cooling tower intake that is that occupy in the middle part of half-closed space is too small, thus make cooling tower intake all reach specified intake, guarantee that cooling tower runs efficiently under specified operating mode; Meanwhile, blower fan of cooling tower model is selected in cooling tower intake and pressure drop, avoids blindly carrying out blower fan of cooling tower type selecting.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the air conditioner cooling tower group control method that the present invention is based on half-closed space.
Fig. 2 is the structural representation of the air conditioner cooling tower group control method application example that the present invention is based on half-closed space.
In figure, each label represents:
1, half-closed space; 11, vertical ventilating shaft; 2, cooling tower; 21, cooling tower exhaust duct; 22, cooling tower air exhaust box; 23, cooling tower air-discharge silencer; 24, cooling tower demister; 3, water main; 4, return main.
Detailed description of the invention
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
Fig. 1 and Fig. 2 shows the air conditioner cooling tower group control embodiment of the method based on half-closed space of the present invention, and the method comprises the following steps:
1) set up the air conditioner cooling tower group physical model based on half-closed space according to the physical dimension in half-closed space 1, the arrangement of air conditioner cooling tower group and physical dimension, adopt the modeling of Solidwork 3D sculpting software, generate STEP file;
2) adopt ICEM CFD software to carry out stress and strain model to physical model and set up grid model, generate msh file;
3) in ANSYS FLUENT software, described three-dimensional grid model is read in and by the model parameter of air flow method in the half-closed space 1 of this software set numerical simulation and variable parameter, model parameter comprises turbulence model parameter and cooling tower 2 place airflow patterns parameter, and variable parameter comprises discrete pressure parameter, air velocity parameter, tubulence energy parameter and tubulence energy dissipative shock wave parameter;
4) preset each cooling tower 2 negative pressure, the present embodiment is set to-140Pa;
5) boundary condition of setup algorithm and primary condition;
6) calculating is initialized, adopt finite volume method to carry out numerical simulation calculation, obtain numerical simulation calculation result;
7) extract and add up each cooling tower 2 intake, when the cooling tower intake calculating gained is greater than this cooling tower 2 specified intake, then reduce the default negative pressure of this cooling tower 2, when calculating the cooling tower intake of gained and being less than the specified intake of this cooling tower, then improve the default negative pressure of this cooling tower 2;
8) return to step 5), when the calculating gained cooling tower intake of each cooling tower 2 equals the specified intake of this cooling tower, enter step 9);
9) pressure drop of vertical ventilating shaft 11 entrance to each cooling tower 2 in half-closed space 1 is calculated, the internal drop of each cooling tower 2 and each cooling tower 2 are exported to the pressure drop that cooling tower air exhaust box 22 exports, and obtain the pressure drop exporting whole air flowing stroke from vertical ventilating shaft 11 entrance through each cooling tower 2 to cooling tower air exhaust box 22;
10) blower fan of cooling tower model is selected according to cooling tower intake and pressure drop.
Air conditioner cooling tower group control method based on half-closed space of the present invention, adopt air flow method in the half-closed space 1 of Fluid Mechanics Computation Method for Numerical Simulation, cooling tower intake is optimized, can avoid that cooling tower 2 intake near half-closed space 1 air inlet is excessive and cooling tower 2 intake that is that occupy in the middle part of half-closed space 1 is too small, thus make cooling tower intake all reach specified intake, guarantee that cooling tower 2 runs efficiently under specified operating mode; Meanwhile, blower fan of cooling tower model is selected in cooling tower intake and pressure drop, avoids blindly carrying out blower fan of cooling tower type selecting.
In the present embodiment, the air conditioner cooling tower group physical model based on half-closed space comprises half-closed space 1, vertically 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, water main 3 and return main 4.
In the present embodiment, model parameter also comprises cooling tower air-discharge silencer 23 place airflow patterns parameter and cooling tower demister 24 place airflow patterns parameter, and cooling tower 2 place airflow patterns parameter, cooling tower air-discharge silencer 23 place airflow patterns parameter and cooling tower demister 24 place airflow patterns parameter are all set as porous media region parameter of a flow model.
In the present embodiment, carry out step 2) time, to mix with hexahedral mesh with tetrahedral grid and stress and strain model is carried out to physical model.
In the present embodiment, when carrying out step 3), turbulence model parameter adopts k-e two-equation model, and discrete pressure parameter, air velocity parameter discrete adopt Second-order Up-wind form.
In the present embodiment, when carrying out step 5), the inlet set of vertical ventilating shaft 11 is atmospheric pressure boundary condition, the air intake of cooling tower 2 is set as negative pressure boundary condition, cooling tower air exhaust box 22 outlet is set as atmospheric pressure boundary condition, and each wall place in half-closed space 1 is set as without slippage wall boundary condition.
In the present embodiment, establish 13 cooling towers 2 altogether, its numbering is respectively 301-313(as shown in Figure 2), extract the intake with each cooling tower 2 of statistics, table 1 is for calculating each cooling tower intake of gained when each cooling tower negative pressure of setting is-140Pa, as can be seen from the table, each cooling tower intake is very uneven, cooling tower intake near half-closed space 1 air inlet is excessive, and the cooling tower intake occupy in the middle part of half-closed space 1 is too small.
Table 1 supposes that each cooling tower negative pressure is for calculating each cooling tower intake of gained (m during-140Pa
3/ 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 calculating gained cooling tower intake, adjust each cooling tower 2 negative pressure.When calculating the cooling tower intake of gained and being greater than the specified intake of cooling tower, then reduce the negative pressure of cooling tower, each reduction amplitude is 2Pa; When calculating the cooling tower intake of gained and being less than the specified intake of cooling tower, then improve cooling tower negative pressure, each increase rate is 2Pa.
Reset cooling tower negative pressure boundary condition, repetitive cycling step calculates until each air volume cooling tower reaches nominal air delivery.Table 2 is each cooling tower 2 intake of final gained, and as can be seen from Table 2, after optimizing, each cooling tower intake reaches cooling tower nominal air delivery all substantially.
Each cooling tower intake (m after table 2 optimal design
3/ 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 |
By the air-pressure drop (Pa) of the whole stroke of each cooling tower after table 3 optimal design
| 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, avoid blindly carrying out blower fan of cooling tower type selecting.
Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, when not departing from technical solution of the present invention scope, can utilize the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or being revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from 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 drop in the scope of technical solution of the present invention protection.
Claims (8)
1., based on the air conditioner cooling tower group control method in half-closed space, it is characterized in that: comprise the following steps:
1) the air conditioner cooling tower group physical model based on half-closed space is set up according to the physical dimension of described half-closed space (1), the arrangement of described air conditioner cooling tower group and physical dimension;
2) stress and strain model is carried out to described physical model and set up grid model;
3) model parameter and the variable parameter of half-closed space (1) interior air flow method described in numerical simulation is set, described model parameter comprises turbulence model parameter and cooling tower (2) place airflow patterns parameter, and described variable parameter comprises discrete pressure parameter, air velocity parameter, tubulence energy parameter and tubulence energy dissipative shock wave parameter;
4) each cooling tower (2) negative pressure is preset;
5) boundary condition of setup algorithm and primary condition;
6) described calculating is initialized, adopt finite volume method to carry out numerical simulation calculation, obtain numerical simulation calculation result;
7) extract and add up each cooling tower (2) intake, when the cooling tower intake calculating gained is greater than this cooling tower (2) specified intake, then reduce the default negative pressure of this cooling tower (2), when calculating the cooling tower intake of gained and being less than the specified intake of this cooling tower, then improve the default negative pressure of this cooling tower (2);
8) return to step 5), when the calculating gained cooling tower intake of each cooling tower (2) equals the specified intake of this cooling tower, enter step 9);
9) pressure drop of vertical ventilating shaft (11) entrance to each cooling tower (2) of described half-closed space (1) is calculated, (2) internal drop of each cooling tower and each cooling tower (2) are exported to the pressure drop that cooling tower air exhaust box (22) exports, and obtain the pressure drop exporting whole air flowing stroke from described vertical ventilating shaft (11) entrance through each cooling tower (2) to cooling tower air exhaust box (22);
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 based on half-closed space according to claim 1, is characterized in that: described model parameter also comprises cooling tower air-discharge silencer (23) place airflow patterns parameter and cooling tower demister (24) place airflow patterns parameter.
3. the air conditioner cooling tower group control method based on half-closed space according to claim 2, is characterized in that: cooling tower (2) place airflow patterns parameter, cooling tower air-discharge silencer (23) place airflow patterns parameter and cooling tower demister (24) place airflow patterns parameter are all set as porous media region parameter of a flow model.
4. the air conditioner cooling tower group control method based on half-closed space according to claim 1, is characterized in that: carry out step 2) time, to mix with hexahedral mesh with tetrahedral grid and stress and strain model is carried out to described physical model.
5. the air conditioner cooling tower group control method based on half-closed space according to claim 1, is characterized in that: when carrying out step 3), and described turbulence model parameter adopts k-e two-equation model.
6. the air conditioner cooling tower group control method based on half-closed space according to claim 1, is characterized in that: when carrying out step 3), and described discrete pressure parameter, air velocity parameter discrete adopt Second-order Up-wind form.
7. the air conditioner cooling tower group control method based on half-closed space according to claim 1, it is characterized in that: when carrying out step 5), the inlet set of described vertical ventilating shaft (11) is atmospheric pressure boundary condition, the air intake of described cooling tower (2) is set as negative pressure boundary condition, described cooling tower air exhaust box (22) outlet is set as atmospheric pressure boundary condition, and each wall place of described half-closed space (1) is set as without slippage wall boundary condition.
8. the air conditioner cooling tower group control method based on half-closed space according to claim 1, is characterized in that: the described air conditioner cooling tower group physical model based on half-closed space comprises half-closed space (1), vertically 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), water main (3) and return main (4).
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