INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!

*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.

Jobs

Heat Transfer thorugh Cable Insulation from a single source

Heat Transfer thorugh Cable Insulation from a single source

(OP)
Hey all,

I am trying to determine the heat flow into the insulation of an electrical cable with insulation from a heat source touching it at one point along its length. (Like a cylinder sitting on a hot slab) I am ignoring any convection at the moment.

I have the equation:

Q = (2pi*k*l*(T1-T2))/(ln(r1/r2))

But i believe this is for a temperature source surrounding the entire circumference and not just at a point.

Please let me know if I am wrong about the equation and if not what equation i can use to solve for the heat flow into the cable insulation.

Thanks.

RE: Heat Transfer thorugh Cable Insulation from a single source

Is this a school assignment?

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: Heat Transfer thorugh Cable Insulation from a single source

(OP)
No.

It's a calculation to support the experimentally proven fact that conductors running single phased in metallic conduit will melt the insulation.

I left this out to try and keep my question simple as to not create a side discussion about the experiment itself, which will surely now happen.

Thanks for your input.

RE: Heat Transfer thorugh Cable Insulation from a single source

The simple one-dimensional equation you have is not going to get you where you need to be.

You would appear to have at least two-dimensional heat transfer, with internal heat generation.

Probably not safe to ignore convection either.

Start with a clear statement of the problem.

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


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