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abueed
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Join Date: Apr 2012
Posts: 8

Underground Garage Ventilation

10/28/2013 6:27 PM

I Mohammed Abueed, an engineer who works in the field of buildings consultant.recently, I was asked to design duct plan for underground garage but i faced a problem that friction in duct was 6 Pa/m which is very high from my point of view if there is something else. Is this acceptable friction rate or it needed to change duct parameters.
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lyn
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#1

Re: underground garage ventilation

10/28/2013 6:45 PM

I'd engaged a consultant to help you.

We can't see any of the details and don't know what you know.

Why ask total strangers to do your work?
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Stedou73ish
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#19
In reply to #1

Re: underground garage ventilation

10/31/2013 12:43 PM

EXACTLY.........lyn...........EXACTLY

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SolarEagle
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#2

Re: underground garage ventilation

10/28/2013 7:23 PM

http://www.engineeringtoolbox.com/equivalent-diameter-d_443.html

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Fredski
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#3

Re: underground garage ventilation

10/28/2013 7:23 PM

I'm glad you're man enough to admit this assignment is over your head and you need other people to verify the expertise you're being paid to provide. I just really don't think an internet forum is a prudent choice. I think this one is going to cost you and or your firm a few bucks
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Tornado
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#4

Re: underground garage ventilation

10/28/2013 8:31 PM

Can you give some data about duct sizes, air flows, and velocities?

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Fredski
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#5
In reply to #4

Re: underground garage ventilation

10/28/2013 8:35 PM

and air changes per hour! and make up air that will be available
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lyn
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#6

Re: Underground Garage Ventilation

10/28/2013 8:53 PM

And total area to be conditioned. And location. And daily traffic load. And all the other things that are relevent to the job at hand.

What are your qualifications? Experience? Education? Other contemporary associates?

Give some actual facts with which to work!!!!!!!!!!!!!!
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IdeaSmith
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#7

Re: Underground Garage Ventilation

10/28/2013 9:21 PM

If you are an engineer you can crunch some numbers.

How much pressure drop do you actually get for say 1000 m of ductwork?

What would you change in the ductwork to reduce friction and how would this show on the balance of your building budget?

Why are you so concerned about fricion factor but not about how the layout of the ducts needs to be? You understand that you have the potential to kill someone in this garage?!

It is time to step back and hire a consultant that has done this before. If you leave a spot of fumes building up in a corner of you garage, the next person stepping into this unventilated room will collapse and potentially die.

Pay your insurenace as you might need it!

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1capybara
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#8

Re: Underground Garage Ventilation

10/29/2013 11:46 PM

CR4 ADMIN: Deleted Post

Vulgar/Rude/Improper Behavior: This post was deleted because it did not adhere to the behavioral policies of the site. Please review Section 14 of the CR4 Site FAQ and the CR4 Rules of Conduct.

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Geoffrey36
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#9
In reply to #8

Re: Underground Garage Ventilation

10/30/2013 6:31 AM

Not kind - if one can't help, one does not post!
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ozzb
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#11
In reply to #9

Re: Underground Garage Ventilation

10/30/2013 7:16 AM

Hey I didn't get that post on the new rule changes on this site.

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lyn
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#17
In reply to #9

Re: Underground Garage Ventilation

10/30/2013 9:41 AM

Take your own advice.

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Rixter
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#10

Re: Underground Garage Ventilation

10/30/2013 7:03 AM

A Pascal is pretty small. There are about 6895 Pa per PSI.
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ozzb
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#12

Re: Underground Garage Ventilation

10/30/2013 7:27 AM

As an engineer you should not let your opinion cloud issue. Look up what is acceptable. What most of the industry base the fiction loss on in their designs. If your still not happy change it your the designer. Hint SolarEagle's link if you dig deeper in to the site you will find the answers you seek.

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Ambrosius
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Join Date: Oct 2013
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#13

Re: Underground Garage Ventilation

10/30/2013 7:40 AM

Hi Mohammed. I suggest u use th same method used for underground mines ventilation. I hold a competency ticket for practicing as engineer in underground mines In South Africa. All u need to knw is the traffic volume to give u an insite of fumes and heat tobe extracted and the heat generation of the rocks. Thn you workout the required ventilation capacity, drill by raiserbore a ventilation shaft to surface and instal extraction fan on surface. And instal if necessary booster fans in corners. How deep is the garage? This method wrks fr massive underground excavations and deep operations
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Fredski
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#14
In reply to #13

Re: Underground Garage Ventilation

10/30/2013 8:04 AM

drill by raiser bore???in a garage?
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IdeaSmith
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#16
In reply to #14

Re: Underground Garage Ventilation

10/30/2013 8:54 AM

Well that would be a new selection of a duct size!

The shaft diameter is in question now. Any idea what the friction is gonna be?

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Geoffrey36
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#15

Re: Underground Garage Ventilation

10/30/2013 8:12 AM

The CIBSE Guide at Table B2.3 requires 6-10 fresh air changes per hour with no recirculation.
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Stedou73ish
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#18

Re: Underground Garage Ventilation

10/31/2013 12:33 PM

Try this

http://www.mobilecalibrationservices.com/Ventilation_for_enclosed_parking_garages.pdf

If nothing else it is a great read and will be good information for your next design.

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Users who posted comments:

1capybara (1); Ambrosius (1); Fredski (3); Geoffrey36 (2); IdeaSmith (2); lyn (3); ozzb (2); Rixter (1); SolarEagle (1); Stedou73ish (2); Tornado (1)

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