×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

HVAC Efficiency

HVAC Efficiency

HVAC Efficiency

(OP)
In a building with high ceiling, is there an advantage in operating efficiency or cost of operation to dropping the supply and return ducts of roof mounted HVAC units.  Does this really create a "dead air" zone with some insulating effect?
If there are benefits, are there reasonable limits,  ie  6 feet of "dead space" as a minimum?

RE: HVAC Efficiency

Hello Elwin

To get the main aspect from your question, if you say that the building has a high ceiling and you want to treat it efficiently and low cost operation, try to be caucious with diffusion system, you will choose. I call your attention to analyse diffusion systems, such as the so-called "displacement diffusion systems", which means a diffusion (supply) with slow motion at the occupied zones, according with the layout and architecture possibilities/limtations and the returns at the half-high and/or at the top, close to the ceiling. At this high, you should have always the extraction grids to extract the used and polluted air. Of course you need to use air ducts. Hoping this can help. zzzo

RE: HVAC Efficiency

I've been tossing your question around in my mind and to a coworker and it's very interesting. My guess would be yes, there would be some energy savings (and his was no!). This sounds like one of those things that only a before and after evaluation would really tell. Exhaust capture location, room dynamics, and diffuser air throw would make each analysis unique and providing definitive answer a little too difficult as a quick answer in a forum... Chas

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!


Resources