Equivalent Diameter 2z101w

27/11/12

Equivalent Diameter

Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Ads by Google

Calculate Diameter

Duct Sizing

Air Duct Work Search

Home

Share

HVAC Duct

Recommend

Custom Search

Tw eet

Share this on Google+ 13

• Acoustics • Air Psychrometrics • Basics • Combustion • Drawing Tools

Sponsored Links

Equivalent Diameter Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator Duct Leakage Tester with imperial and SI-units Sponsored Links

• Dynamics • Economics • Electrical • Environment • Fluid Mechanics

Duct From 1M+ Global Exporters. Trusted Suppliers Now. Top Deals! www.alibaba.com

www.m illionage ncie s.com

Duct Leakage Tester Positive & Negative Duct Accreditation System www.millionagencies.com Recommend the corn dryer Grain will not change color, crack, The color and lustre will as same www.115e.com

• Gas and Compressed Air • HVAC Systems • Hydraulics and Pneumatics

Positive & Negative Duct Accreditation System

The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.

• Insulation

Duct From 1M+ Global Exporters. Trusted Suppliers Now. Top Deals! www.alibaba.com

Steel Pipe

• Material Properties

For Pressure Bolier,Oil&Gas, Fluid Transport and Machinery Components

• Mathematics • Mechanics • Miscellaneous

www.sinodragonpipe .com

• Physiology • Piping Systems • Process Control • Pumps • Standards Organizations • Steam and Condensate • Thermodynamics • Water Systems Ads by Google

Water & Air Flowmeters

The equivalent diameter of a rectangular tube or duct can be calculated as (Huebscher) de = 1.30 x ((a x b)0.625 / (a + b)0.25)

Rotameter, Turbine & Thermal types for process, environmental & OEM's!

(1)

where

www.e rdco.com

de = equivalent diameter (mm, inches)

Pipa Air Panas Rifeng

a = length of major or minor side (mm, inches)

Pasang dan Kirim kemana Saja 0315022485, 081 651 9697

b = length of minor or major side (mm, inches)

Oval Duct Heating Duct

Rectangular to Equivalent Circular Duct Calculator

Flow Meter

The calculator below is based on formula (1). The formula is generic and any unit can be used.

Convert Units Temperature

0 oC oF

Length side a - (mm, inches)

100

Length side - b - (mm, inches)

Free Industry Magazines Avionics Intelligence

Calculate!

Convert! Length

100

pipaair-panas.blogspot.c…

Equivalent diameters for some common mm rectangular dimensions are shown in the table below:

1

Circular equivalent diameter - de (mm) m km in ft yards miles nautical miles

Convert! Volume

1 m3 liters in3 ft3 us gal

Convert! Velocity

1

Duct side -a mm 100

100

150

200

250

300

400

500

109

133

152

168

183

207

227

150 200

133 152

164 189

189 219

210 244

229 266

261 305

287 337

310 365

250 300

168 183

210 229

246 266

273 299

299 328

343 378

381 420

400 500 600

207 227

260 287 310

305 337 365

343 381 414

378 420 457

437 488 531

414

470 517

520 574 620

800 1000

Duct side - b (mm)

1200 1400 1600 1800 2000

600

Medical Design Briefs

800

1000 1200 1400 1600 1800 2000

414 457

470 520

574

488 547 598

531 598 656

609 687 755

674 762 840

609 674

687 762

755 840

875 976

976 1066 1146 1219 1286 1093 1196 1289 1373 1451 1523

731 781

827 886

914 980

1066 1196 1312 1416 1511 1598 1680 1146 1289 1416 1530 1635 1732 1822

939

1041 1219 1373 1511 1635 1749 1854 1952 1096 1286 1451 1598 1732 1854 1968 2073 1523 1680 1822 1952 2073 2186

Photonics Online

731 827 914

886 980

1041

Engineering Standards

m/s

www.engineeringtoolbox.com/equivalent-diameter-d_205.html

1/3

27/11/12

Equivalent Diameter km/h

Equivalent diameters of some common inches rectangular ducts are shown in the table below:

ft/min

Circular equivalent diameter (inches) Length - a - (inches) 5 6 8 10

ft/s mph knots

Convert! Pressure

1 Pa (N/m 2 ) b ar mm H2 O kg/cm 2 psi inches H2 O

Convert! Flow

1

Length - b (inches)

4

4 5 6 8

4.4 4.9 5.3 6.1

10 12 16

4.9 5.5 6 6.9

5.3 6 6.6 7.6

6.1 6.9 7.6 8.6

7.6

8.4 9.1

9.8 10.7 12.2

12

16

7.6 8.4 9.8

9.1 10.7

12.2

10.9 12 13.7

12 13.1 15.1

13.7 15.1 17.5

Oval Equivalent Diameter (Ellipse) The equivalent diameter of a oval duct or tube (ellipse) can be calculated as (Heyt & Diaz) de = 1.55 A0.625/P0.2

(2)

where m 3 /s m 3 /h

A = cross-sectional area oval duct (m2, in2)

US gpm

P = perimeter oval duct (m, inches)

cfm

Convert!

Free Industry Magazines Avionics Intelligence The cross-sectional area of an oval duct can be expressed as A=πab/4 where a = major dimension of the flat oval duct (m, in) Medical Design Briefs

b = minor dimension of the flat oval duct (m, in) The perimeter of an oval duct (ellipse) can be approximated to P ≈ 2 π (1/2 ((a/2)2 + (b/2)2))1/2

(2b)

Oblong Ducts Photonics Online

Engineering Standards

Equivalent diameters of oblong ducts or pipes can be expressed as de = 1.55 (π b2 / 4 + a b - b2)0.625/(π b + 2 a - 2 b)0.25

(3)

Hydraulic Diameter Note! Equivalent diameter is not the same as hydraulic diameter. The hydraulic diameter express the rate between the area section of the duct or tube, and the wetted perimeter of the duct or tube. Hydraulic diameter is used to determine if the flow is laminar or turbulent and to calculate the pressure loss. Sponsored Links

Steel Pipe For Pressure Bolier,Oil&Gas, Fluid Transport and Machinery Components www.sinodragonpipe.com Water & Air Flowmeters Rotameter, Turbine & Thermal types for process, environmental & OEM's! www.erdco.com ASME Standards Stay Current on All ASME® Standards Process Piping Standards From ASME! ToolsBooks.com/ASME+Standards Stainless Steel Pipes Ex-stock A312 Stainless Steel Pipes We ship to Indonesia. Enquire now! www.chuankok.com.sg

Search the Engineering ToolBox Search

Custom Search

Related Topics Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.

www.engineeringtoolbox.com/equivalent-diameter-d_205.html

2/3

27/11/12

Equivalent Diameter Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

Related Documents Air Ducts Friction Loss Diagram - Major loss diagram air ducts - Imperial units ranging 10 - 100 000 cfm Converting Round Duct Diameter to Area - Converting round duct areas to square feet and square meters Friction Loss in Ducts - Friction loss or major loss in ducts - equations and online calculator for rectangular and circular ducts - imperial units Fuel Oil Storage Tanks - Dimensions of fuel oil storage tanks Hydraulic Diameter - Hydraulic diameter of ducts and tubes Hydraulic Diameter of Rectangular Ducts - Rectangular ducts and hydraulic diameter Rectangular Duct Sizes - Dimensions of common rectangular air ducts used in ventilation systems Rectangular and Circular HVAC Ducts - Equivalent Diameter - Equivalent diameters for rectangular and circular ducts - air flows between 100 - 50,000 cfm

Engineering ToolBox - SketchUp Edition - Online 3D modeling!

Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp

Translate the ToolBox Arabic - Chinese (Simplified) - Chinese (Traditional) - Dutch - French - German - Italian - Japanese - Korean Portuguese - Russian - Spanish - - Select Your own language . .

About the ToolBox We appreciate any comments and tips on how to make The Engineering ToolBox a better information source. Please us by email [email protected] if You find any faults, inaccuracies, or otherwise unacceptable information. The content in The Engineering ToolBox is copyrighted but can be used with NO WARRANTY or LIABILITY. Important information should always be double checked with alternative sources. All applicable national and local regulations and practices concerning this aspects must be strictly followed and adhered to.

in the ToolBox If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords.

www.engineeringtoolbox.com/equivalent-diameter-d_205.html

3/3