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[chemeng498]

Hi,

 

I have been tasked with designing and sizing a simple lab trial. I am currently stuck on sizing the heat transfer section.Because the fluid being heated is very corrosive (and other reasons) the pipe work being used will be glassed lined steel tubing.

 

The original idea was to pass this tubing through a hot oil bath but the required duty may not met using this method. On the manufactures website for the tubing it mentions that the tubing can be heated by passing a low voltage across the metal casing.

 

Could any one please give guidance or point me in the right direction on calculating the maximum temperature and duty that could be reached using this method. Any help would be appreciated. 

 

[markymaark]

Same as your normal heating.  You have your Q source (in kW), your surface area of the tubing, and now you have two different thermal conductivities (glass and SS).

 

I do not have experience with glass lined pipes, but since glass is such a poor insulator I'd be looking to heatup the liquid in a small vessel, then pass it through the tubing to its intended source.