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


Fresh air make up unit

Fresh air make up unit

Fresh air make up unit

Hi , we are upgrading the ambient and design temperature from 45 Deg & 25 Deg to 55 Deg & 22 Deg. So now the owner doesn't want to change the unit. Instead of changing the units he wants to add a FMAU. Here is the details

Existing Unit details:
Air flow - 9000 CMH
Cooling kW - 140. 0 Kw
Air On : 34.45°C DB, 29.88°C WB
Air Off: 13°C DB, 12.5°C WB

Please guide me, how to select the unit and I did rough calculation and the result is about 265.0 Kw.

RE: Fresh air make up unit

Your OP is not well stated. To me ambient temperature is the outside temperature, is that so? Design temperatures, to me, means the outside temperature on which you would size your heating or cooling requirements and both ambient and design temperatures have no units. There is no relative humidity mentioned under the design conditions. The existing unit details about Air On and Air Off On would those be the approximate DB and WB temp[eratured expected in the space to be cooled?

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