Hello,
I am currently specifying a 10,000 gal pressure vessel that will need to be equipped with heating abilities.
I am looking to have a half-pipe jacket installed on the vessel that covers the bottom head, and the bottom half of the shell. I know this will equate to a certain heat transfer area.
I would like to have a decent understanding of potential design of the jacket instead of blindly submitting it to a vendor. I'm trying to figure out how to design this, but I've run into a couple of sticking points -- can anyone help?
In short, I just haven't found a good guide for doing this jacket design.
I would believe my steps are:
- Calculate total area of heat transfer (assuming 2" or 3" half pipe)
- Using Q = UAΔTLM, calculate Q,max (ΔTLM is calculated, U is assumed)
- Use Q,max to calculate steam flow rate (based on 90 psig steam available)
- Assume three or four zones, determine flow per zone based on max velocity of 25 m/s
- Complete pressure drop calculations on each zone
- Use steam flow rate to determine batch heating time
I've tried doing some of these steps, I'll share my results as needed, however, I'd like to make sure I'm on the right track.
Also, I'm very confused by:
- How do I calculate the total heat transfer area for the jacket?
- How do I calculate the cross-sectional area of the jacket?
- I've seen some resources that require hydraulic diameter, some that require actual diameter, but no single, simple equation