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What is the condition's of the good duct design?

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Question added by Ismael Hamad , Trainer , ANTONOIL DMCC , Lukoil project, WQ2
Date Posted: 2015/08/19
mohamedi kassim hassan kaila
by mohamedi kassim hassan kaila , Mechanical Engineer -Plumbing and Hvac designer , Mes Engineering Consultancy Ltd

The essential condtions for duct design

(a) The design meets requirements

(b) Design with high performance with low cost

(c) Design with High reliability

magdy abd al nour
by magdy abd al nour , HVAC Site manger , First United Co.

1-good air distribution is the most important cfm/meter square

2-average level noise criteria 

3-air velocity in the room from50 to300 fpm

4-good looking design 

5-the cost 

6-the critical path be short as possible 

Sherif Mohammed Ibrahim
by Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

low cost = aspect ratio near to 1:1

low noise according to usage of space

low friction loses

 

chetan sharma
by chetan sharma , Senior project engineer , trinity engineering services

take the ratio of duct in terms of width and height as one : four ratio,avoid unnecessary turns and curves

ABRAR ALI KHAN
by ABRAR ALI KHAN , MEP Project Manager , Golden Sand Engineering Services

Good efficiency.

Less losses.

Proper dimensions ( Maintaining proper cfm) Best material ( Low weight, less corrosive & good life)

Effective duct routing ( Less material to be incorporated i.e. cost effective)

Ali Soufan
by Ali Soufan , Senior Building Services & Sustainability Engineer , BUTEC

If duct design meant to be the duct sizing, then I would recommend following SMACNA or DW standards, and ASHRAE handbook

Nadeem Sheikh Mohammed
by Nadeem Sheikh Mohammed , QAQC Engineer Mechanical/ MEP Inspector , SOBHA ELECTROMECHANICAL WORKS LLC

If the system manages to give you the amount of air as required by the design of the duct i.e if the flow of air in your grilles/diffusers matches the design requirement you system is okay.

But for effective running of the system, we also need to check the following points.

i) The material quality of the duct.

ii) To check the installation of the duct and its air tightness by performing air leakage tests.

iii) Check how much is the noise criteria by proper installation of sound attenuators. 

iv) Check the duct routing and avoid lots of bend, as it results in air/pressure loss.

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