×
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

90 percent gas furnaces for packaged units

90 percent gas furnaces for packaged units

90 percent gas furnaces for packaged units

(OP)
Why is there not a 90% gas fired heating and cooling packaged units.  If there is a unit, where do I find it?

RE: 90 percent gas furnaces for packaged units

What the heck does this question want to ask ???

RE: 90 percent gas furnaces for packaged units

90% of what?

I assume you mean a 90% HHV efficiency.  Most smaller units that meet the 90% HHV efficiency use pulsed combustion and partial condensing of the fluegas. 2 issues with this are (a) noise from the pulsed combustion and (b) stack corrosion and required fan head to pressurize the stack to exhaust the fluegas. For smaller units a CPVC stack might meet building codes, but for larger units it might not meet fire code, and a pressurized exhaust is a risk to occupants.

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