Heat loss from a pipe in the wind
Heat loss from a pipe in the wind
(OP)
Friends,
I am looking for a method to estimate heat losses (or U value) from a pipe carrying liquid that considers wind speed and ambient temperature. I used to have a nomograph (also required pipe diameter, surface temp, etc), but I have lost this ancient resource. I am looking for either a paper on the subject, calculation, nomograph, or a modern equivalent.
Thanks,
sshep
I am looking for a method to estimate heat losses (or U value) from a pipe carrying liquid that considers wind speed and ambient temperature. I used to have a nomograph (also required pipe diameter, surface temp, etc), but I have lost this ancient resource. I am looking for either a paper on the subject, calculation, nomograph, or a modern equivalent.
Thanks,
sshep





RE: Heat loss from a pipe in the wind
Regards
StoneCold
RE: Heat loss from a pipe in the wind
http://www.thermal-wizard.com/tmwiz/default.htm
RE: Heat loss from a pipe in the wind
I think newer versions of this standard use a more modern equation, but I still use the Langmuir equation.
RE: Heat loss from a pipe in the wind
and followed with an interesting article at: http://www.cheresources.com/insulationzz.shtml
For taking wind effects into account, you'll need to do a small calculation work for estimating U in the forced convection regime across a single cilinder/tube, and then replace the original value in the spreadsheet from above. It is good exercise and provides an insightful view how the presence of wind makes things completely different - when speaking about ambient heat losses.
http://antwrp.gsfc.nasa.gov/apod/astropix.html