×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Cooling loss

Cooling loss

Cooling loss

(OP)
I have a 16 inches (outside diameter)chilled water pipeline (carbon steel) that is 20 feet long. Water is flowing through it with an initial temp of 1 degC. The line is exposed to an air temperature of 40 DegC and I would like to know the temperature at the end of the pipeline. The flow rate is 2000L/Hr.
I'm trying to generate some kind of pipeline heat gain table using the exposed pipe.
Can anybody helps

RE: Cooling loss

2 m3/ HOUR??

In a 16" pipe? Why. Far too big

Can you check your units and flow?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Cooling loss

(OP)
Sorry I was busy.
This statement is a scenario. You can change flow, dis of pipe. I just want to calculate cool in loss

RE: Cooling loss

(OP)
I want to calculate the temperature at other ends of the pipe. e.g if pipe length is 10m, water enters at 1 degC and 20000 L/hr.

RE: Cooling loss

Arslanash,

Use your engineering degree. Internal resistance to flow will be the standard convective heat transfer coefficient calculation based on Re and liquid properties. The pipe will, too, will be standard with the metal thickness and material properties.

It's the outside air that presents something not found standard in engineering textbooks. If this pipe is outside, there are usually too many factors to get an accurate number because the conditions change so wildly. If you want to approach this analytically, there is a method for calculating the Reynold's number of a gas flowing on the outsideof a pipe based on wind speed. You would treat this as convective heat transfer, with your thermal boundary layer thickness being dependent on the Re number. Then, you can do your usual Q = U*A*dT, with U being the inverse of the sum of the thermal resistances.

If it rains or if your pipe temperature is below the dewpoint, be prepared for all of the above calculations to wildly underestimate the heat loss.

RE: Cooling loss

(OP)
How to calculate temperature at other end of pipe. For example if length of pipe is 10ft and entrance temperature is 2 def C

RE: Cooling loss

Quote (Arslanash)

How to calculate temperature at other end of pipe. For example if length of pipe is 10ft and entrance temperature is 2 def C
Use a pipeline software. I was doing this in Inplant/Pipephase and bet Pipenet, Flowmaster and similar are able to do this also.

RE: Cooling loss

Try this? https://www.google.com/amp/s/www.engineeringtoolbo...

Also whilst there are many variables - wind speed being the main one, you're probably at about 10 to 20 W/m2K. Do the maths.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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! Already a Member? Login



News


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