Smart questions
Smart answers
Smart people
Join Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

Join Eng-Tips
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

HVAC68 (Mechanical) (OP)
9 Nov 06 2:28
What's the air changes to be considered for pressurization of

(a)  Lift well
(b)  Lift lobby

HVAC68

atlas06 (Mechanical)
30 Nov 06 23:44
By lift well, I guess you mean elevator shaft.

This pressurization business comes into play only for buildings requiring smoke evacuation systems.
In the US, we simply don't pressurize elevator shafts. Unfortunately, life safety is one the vaguest areas in our industry in the US, there is so much liability (we have 60% of the world's lawyers) that the codes keep being revised with more and more "engineered systems" being called for by the code. There is not one code that will say pressurize or not pressurize elevator shafts (including ASHRAE).
The problem with elevator shafts is that here we require them to have a relief opening at the floor below the top floor. So pressurizing the elevator shaft is just not practical, we do use elevator lobby pressurization at o.5" static pressure when required such as pressure sandwitch in smoke control in jails and the likes.

If I were to pressurize, I will make sure that the system serving the lobby is a dedicated system and all other adjacent areas go into negative in a smoke control mode, this will keep the smoke from migrating from one floor to another through the elevator shaft.

why do you want to pressurize anyway? is your application a smoke control issue? or just comfort? Your air balance for your entire ebuilding should see a 5% to 10% positive pressure overall anyway.

Not much help from this side of the Atlantic on this one I am afraid.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close