×
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

Conversion calculation

Conversion calculation

Conversion calculation

(OP)
I am trying to get an idea of how long it would take to heat a train rail car above 120°F. Filled with a liquid weighing 10 lbs per gallon. Total gallons are 4,800.  The total liquid weight is 48,000 lbs.  Lets assume its summer time and the ambient temperature is and average 90°F.

Keith Mort
Franklin International
Technical Specialist
http://www.franklininternational.com

RE: Conversion calculation

The rail car will never get above 120F if the ambient temp is 90F. Unless you have another heat source.

RE: Conversion calculation

(OP)
Most rail cars are painted black. Therefore the sun's radiant heat will heat the container much hotter than the ambient temperature.

Keith Mort
Franklin International
Technical Specialist
http://www.franklininternational.com

RE: Conversion calculation


If both absorptivity coefficients (from solar radiation, and from low-temperature-radiation to the surroundings) in equilibrium are equal, say 0.95, and the solar flux is about 700 W/m2 the exposed tank wall temperature may get above 210oF, as explained by KMort.

The final temperature would depend on the heat absorption by the tank contents and any convection effects from the surrounding air.

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