CN108644993A - A kind of the low flow resistance plumbing installation and design method of balanced ventilation - Google Patents
A kind of the low flow resistance plumbing installation and design method of balanced ventilation Download PDFInfo
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- CN108644993A CN108644993A CN201810253219.0A CN201810253219A CN108644993A CN 108644993 A CN108644993 A CN 108644993A CN 201810253219 A CN201810253219 A CN 201810253219A CN 108644993 A CN108644993 A CN 108644993A
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- threeway
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- main pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0245—Manufacturing or assembly of air ducts; Methods therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Pipe Accessories (AREA)
- Ventilation (AREA)
Abstract
The invention discloses the low flow resistance plumbing installation and design method of a kind of balanced ventilation, described device includes main pipeline, threeway and lateral.The cross-sectional height of the main pipeline along its length is gradually reduced, to ensure that air output is uniform at each lateral；The face of threeway inlet and outlet junction is curved surface, and the form of curved surface is arc surface, for reducing the flow resistance in main pipeline.Air supply duct device disclosed in this invention can realize balanced ventilation, and have the advantages that flow resistance is low.
Description
Technical field
The invention belongs to air-conditioning control technology fields, more particularly, to a kind of low flow resistance of balanced ventilation
Plumbing installation and design method.
Background technology
With the development of society, industrial technology and human lives require to gradually increase to environmental protection and energy saving, gravity-flow ventilation is not
Modern crafts and the requirement of human lives can be met.The uneven air in living area can cause the comfort of people to decline, industrially
Uneven air can then influence production efficiency.
For air supply duct, the size of air output depends on the size of the static pressure of air outlet, it is ensured that each air outlet
Air output is uniform, then needs to ensure that the static pressure of each air outlet is identical, it is, the difference etc. of the dynamic pressure between two neighboring air outlet
The sum of friction pressure loss and local pressure loss between the two air outlets.For general air supply duct, along master
The cross-sectional area of duct orientation is typically all constant, and such air supply duct cannot be guaranteed that the air output of each air outlet is equal
It is even.In addition to this, with the increase of air supplying distance, the fan resistance along main pipeline direction can gradually increase, and dynamic pressure decaying also can
Increase, can also increase the inhomogeneities of each air outlet.
Nowadays air supply duct used by many megastore, house, factory cannot meet balanced ventilation, therefore, existing
There is technology to be developed and improves.
Invention content
Technical problem to be solved by the present invention lies in, for the big defect of prior art uneven air, flow resistance,
A kind of the low flow resistance plumbing installation and design method of balanced ventilation are provided.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of low flow resistance plumbing installation of balanced ventilation, including main pipeline, several threeways, several laterals；The master
The section of pipeline and lateral is rectangular or round；The main pipeline is connected with lateral by threeway；The master
The height of the cross section of pipeline along its length（Cross section is that circle then indicates diameter）It is gradually reduced；Described three are connected with four
A face is curved surface；The form of the threeway curved surface is arc surface；The radius of the threeway curved surface is respectively 20.05D（D is threeway
Be connected the hydraulic diameter of cross section with main pipeline）, 0.2d（D is that threeway is connected the hydraulic diameter of cross section with lateral）,
3.47d and 8.4d；The cross-sectional area of the threeway is more than the cross-sectional area of traditional threeway；The size of the threeway is according to supervisor
The design of the height of road and lateral；The cross section all same of each lateral；Tube fluid is in each branched pipe
The angle of emergence in road is not less than.
A kind of the low flow resistance plumbing installation and design method of balanced ventilation, wherein the method includes（With rectangular section
For face）：
Step 1：Determine the physical parameter of air-supply fluid（Including density and viscosity）, the material of pipeline；According to the total volume of pipeline
Flow rate, required threeway quantity, calculates the volume flow rate of each exhaust outlet；
Step 2：The cross-sectional area of volume flow rate and lateral needed for each exhaust outlet calculates each exhaust outlet
Air supply velocity, calculate the speed of first threeway hydrostatic driving accordingly；According to total volume flow rate, first threeway along supervisor
The size of road direction cross section calculates the speed of first threeway dynamic pressure driving, then calculates the angle of emergence, which needs not
It is less than；
Step 3：Calculate friction pressure loss, the local pressure loss between first threeway and second threeway；According to meter
The dynamic pressure calculation of friction pressure loss, local pressure loss and first threeway calculated goes out the dynamic pressure of second threeway；
According to the relationship for the speed that dynamic pressure and dynamic pressure drive, the speed of second threeway dynamic pressure driving is calculated；According to flowing through second three
The volume flow rate of logical main pipeline and the speed of second threeway dynamic pressure driving calculate cross of second threeway along main pipeline direction
The size in section calculates height of second threeway along the cross section in main pipeline direction accordingly；
Step 4：With step 2,3 similar methods, height of the remaining each threeway along main pipeline cross section is calculated.
The design principle of the present invention：
In an air supply duct, according to pressure conservation, at i-th of lateral with i+1 lateral, the relationship of pressure
By following equation（1）It indicates：
（1）
It wherein indicates the dynamic pressure at i-th of lateral, indicates the static pressure at i-th of lateral,\*
MERGEFORMAT indicates the friction pressure loss between i-th of lateral and i+1 lateral, \*
MERGEFORMAT indicates the local pressure loss between i-th of lateral and i+1 lateral.Ensure each air draft
The air output of mouth is uniform, then needs* MERGEFORMAT, formula（1）It can be reduced to formula（2）：
\* MERGEFORMAT （2）
For pipeline made of steel, formula（2）The value on the left side is significantly larger than the value on the right, therefore to ensure that balanced ventilation then needs
The cross-sectional area of main pipeline is set to be gradually reduced.
A kind of low flow resistance pipe design method of balanced ventilation provided by the invention has compared with the conventional method
Following advantages and advantageous effect：
（a）The surface of threeway, which is designed to arc-shaped curved surface, can increase the cross-sectional area of threeway, by increasing threeway
Cross-sectional area can reduce the velocity gradient in all directions of cross section, to reduce the fan resistance of pipeline.In addition, utilizing arc
Surface technology can save cost；
（b）The height of the main pipeline of pipeline cross section along its length is gradually reduced, and ensures the static pressure at each lateral
Pressure drop is all identical, therefore the exhaust air rate at each lateral is all identical, to realize balanced ventilation.
Description of the drawings
Fig. 1 is the structural schematic diagram of air supply duct device of the present invention.
Fig. 2 is the front view of air supply duct device of the present invention.
Fig. 3 is the structural schematic diagram of threeway of the present invention.
Specific implementation mode
In order to make the purpose of the present invention, technical solution, advantage be more clear, with reference to the accompanying drawings and embodiments, to this hair
It is bright to carry out detailed title.Present embodiments provide the pipe designed according to a kind of low flow resistance pipe design method of balanced ventilation
Road device, as shown in Figure 1, 2, it is made of main pipeline 1, several laterals 2 and several threeways 3.The main pipeline 1 is along length
Height on direction gradually decreases, and the shape of the threeway 3 is designed according to the height of main pipeline 1 along its length.It is setting
During counting the plumbing installation, following steps are experienced：
Step 1：Determine the temperature of fluid at conduit entranceT, the dynamic viscosity of the type of fluid and at this temperature fluid \*
MERGEFORMAT, density* MERGEFORMAT, determine the material of pipeline；According to the total volume flow rate of pipeline \*
MERGEFORMAT, required threeway quantity n, calculates the volume flow rate of each exhaust outlet\* MERGEFORMAT ；Really
The distance between fixed two neighboring threeway L, the width W, height H of first threeway inlet cross section1, each threeway edge point
The width w of the cross section of branch pipe(tube), height h.
Step 2：By following equation（3）、（4）Determine average speed of each threeway along lateral：
（3）
（4）
By following equation（5）Determine the speed of hydrostatic driving at first threeway, whereinIndicate flow coefficient:
（5）
First threeway goes out the speed of dynamic pressure driving, dynamic pressureRespectively by following equation（6）、（7）It determines：
（6）
（7）
Fluid is at first threeway along the angle of emergence of lateralBy following equation（8）It determines, the angle of emergenceOtherwise it is less than
60°：
（8）
Step 3：Fluid flow volume rate between first threeway and second threewayBy following equation（9）It indicates：
（9）
Friction pressure loss between first threeway and second threewayBy following equation（10）It indicates：
（10）
WhereinIndicate coefficient of frictional resistance,Indicate the distance between two threeways,It is first threeway along main pipeline
The hydraulic diameter of cross section,It is the density of fluids within pipes,Indicate the speed of dynamic pressure driving.
Coefficient of frictional resistance, hydraulic diameter are respectively by following equation（11）、（12）It indicates：
（11）
（12）
WhereinIt indicates roughness, can be determined according to pipeline material,Indicate Reynolds number,It can be by following equation（13）Table
Show：
（13）
Local pressure loss between first threeway and second threewayBy following equation（14）It determines, wherein
Indicate the coefficient of partial resistance between first threeway and second threeway：
（14）
Dynamic pressure at second threewayIt can be by formula（15）It calculates：
（15）
The speed that dynamic pressure drives at second threewayIt can be by following equation（16）It calculates
（16）
Height of second threeway along main pipeline cross sectionIt can be by following equation（17）It calculates：
（17）
Step 4：With step 2,3 similar methods, height of the remaining each threeway along main pipeline cross section is calculated.
The structure of the threeway is as shown in Figure 3：The diversion three-way is there are one import and two outlets, and there are four surfaces for threeway
For curved surface, and the form of curved surface is circular arc.Curved surface 1 is that radius is 20.05D（D is that threeway is connected the waterpower of cross section with main pipeline
Diameter）Circular arc, curved surface 2 be radius be 0.2d（D is that threeway is connected the hydraulic diameter of cross section with lateral）Circular arc, it is bent
Face 3 is the circular arc that radius is 3.47d, and curved surface 4 is the circular arc that radius is 8.4d.* MERGEFORMAT be respectively \* MERGEFORMAT 。
Claims (5)
1. the low flow resistance plumbing installation and design method of a kind of balanced ventilation, which is characterized in that described device includes supervisor
Road, threeway and lateral；The threeway connects main pipeline and lateral；The threeway is curved surface there are four face；
The cross section of the main pipeline and lateral can be rectangular or round；A kind of low flow resistance pipeline of the balanced ventilation
Design method includes following steps：
Step 1：Determine the physical parameter of air-supply fluid（Including density and viscosity）, the material of pipeline；According to the total volume of pipeline
Flow rate, required threeway quantity, calculates the volume flow rate of each exhaust outlet；
Step 2：The cross-sectional area of volume flow rate and lateral needed for each exhaust outlet calculates each exhaust outlet
Air supply velocity, calculate the speed of first threeway hydrostatic driving accordingly；According to total volume flow rate, first threeway along supervisor
The size of road direction cross section calculates the speed of first threeway dynamic pressure driving, then calculates the angle of emergence, which needs not
It is less than；
Step 3：Calculate friction pressure loss, the local pressure loss between first threeway and second threeway；According to meter
The dynamic pressure calculation of friction pressure loss, local pressure loss and first threeway calculated goes out the dynamic pressure of second threeway；
According to the relationship for the speed that dynamic pressure and dynamic pressure drive, the speed of second threeway dynamic pressure driving is calculated；According to flowing through second three
The volume flow rate of logical main pipeline and the speed of second threeway dynamic pressure driving calculate cross of second threeway along main pipeline direction
The size in section calculates height of second threeway along the cross section in main pipeline direction accordingly；
Step 4：With step 2,3 similar methods, height of the remaining each threeway along main pipeline cross section is calculated.
2. a kind of low flow resistance plumbing installation of balanced ventilation according to claim 1, which is characterized in that the supervisor
Road along its length on cross-sectional height be gradually reduced.
3. a kind of low flow resistance plumbing installation of balanced ventilation according to claim 1, which is characterized in that described each
The cross section all same of lateral.
4. a kind of low flow resistance plumbing installation of balanced ventilation according to claim 1, which is characterized in that described each
The angle of emergence at lateral should all be not less than.
5. a kind of low flow resistance plumbing installation of balanced ventilation according to claim 1, which is characterized in that the threeway
The radius of curved surface is respectively 20.05D（D is that threeway is connected the hydraulic diameter of cross section with main pipeline）, 0.2d（D is threeway and divides
The hydraulic diameter of the connected cross section of branch pipe(tube)）, 3.47d and 8.4d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253219.0A CN108644993B (en) | 2018-03-26 | 2018-03-26 | Low flow resistance pipeline device capable of uniformly supplying air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253219.0A CN108644993B (en) | 2018-03-26 | 2018-03-26 | Low flow resistance pipeline device capable of uniformly supplying air |
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| CN108644993A true CN108644993A (en) | 2018-10-12 |
| CN108644993B CN108644993B (en) | 2020-09-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109753760A (en) * | 2019-02-27 | 2019-05-14 | 哈尔滨哈锅锅炉容器工程有限责任公司 | A kind of blast cap drag computation method |
| CN112131696A (en) * | 2020-11-23 | 2020-12-25 | 中国人民解放军国防科技大学 | Performance optimization method of environment-friendly system and track device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109753760A (en) * | 2019-02-27 | 2019-05-14 | 哈尔滨哈锅锅炉容器工程有限责任公司 | A kind of blast cap drag computation method |
| CN112131696A (en) * | 2020-11-23 | 2020-12-25 | 中国人民解放军国防科技大学 | Performance optimization method of environment-friendly system and track device |
| CN112131696B (en) * | 2020-11-23 | 2021-02-26 | 中国人民解放军国防科技大学 | Performance optimization method of environment-friendly system and track device |
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