×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

Thermal Resistance2

Thermal Resistance

(OP)
Hi there,

I am currently working on a project where I am putting together an excel spreadsheet to assist technicians/engineers in designing heat exchangers for generator sets. I have come across an issue in calculating the thermal resistance in which the formula I am supposed to be using appears as follows:

Could someone please confirm the sign between fo and fi? Also my understanding is the dividing factor of fo and fi is the length of pipe, could someone confirm this also? I have looked everywhere and I am unable to find the complete equation.

Thanks

Justin

RE: Thermal Resistance

That may be saying to multiply the terms, but not sure. This is what my book has:

RE: Thermal Resistance

Each companent (variable) of the resistance is in series with each other, thus there should be a plus sign between the fouling factors.

Edit:
Personally I would write the equation as

R = fo + 1/ho + t/k + 1/hi + fi

Following the flow of heat through the element.

RE: Thermal Resistance

(OP)
No worries thanks heaps guys!

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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!