Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • 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!
  • Students Click Here

*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.

Students Click Here


Dual duct system ESP calculation

Dual duct system ESP calculation

Dual duct system ESP calculation

Hello everyone,

I'm sorry for doing this but I have a really novice question. I recently moved from a cooling only climate location to the US. Now I'm working with both cooling and heating systems. I have a doubt when calculating fan external static pressure for dual duct systems. Do I assume that in the worst case scenario all the airflow will be travelling through only one of the decks (e.g. summer or winter) or do I assume flow on both decks at any one point? I'm calculating the ESP from existing drawings so I don't have load calcs to know the peak load of the building, just what I'm seeing in the schedules and floor plans.

Thanks for any help you might provide.

RE: Dual duct system ESP calculation

Take a look at where the outdoor ventilation comes into the building. I have a dual duct VAV system where all the OA comes in via the cooling unit and therefore it will have to run year round.
Also, you may need to run the cooling unit if there are any spaces which would require cooling year round - internal spaces with high heat loads (kitchens, IDFs, etc)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

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