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


furnace design

furnace design

furnace design

dear team,
please help.. whats the definition of :
1. crossover temperature
2. cold plate area tube wall
3. cold plate area shield tube
4. mean beam length

RE: furnace design

My experience is with direct fired heaters. I would suggest you find seek out the papers by Lobo and Evans in addition to the work of Hottel to understand more.

1. crossover temperature - this is temperature of the fluid being heated at the point exiting the convection section/entering the radiant section.

2. cold plate area tube wall - I've always seen this referred to as cold plane area. It depends on the radiant tube surface area and how the tubes are laid out. Generally though, it is equal to (exposed tube length)x(center-to-center spacing)x(number of tubes exclusive of the shield tubes)

3. cold plate area shield tube - Same as above but for the shield tubes. The lowest 1 to 3 rows (depending on who you talk to) of the convection section are called the shield (or shock) tubes. Beyond the 3rd row , there is not appreciable radiation from the radiant section.

4. mean beam length - A factor that seeks to account for the effect of the geometric layout on the radiation of a gas volume to its boundary. There are tables available with equations to calculate MBL for typical heater layouts.

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