2 replies to this topic

[MGS RN]

Hello All,

 

Myself Goutham and I am working professional in the Shell & Tube exchanger design and have around 5 years experience in this field. We have in house methods of sizing heat exchangers in our company. Recently I designed 1-2 TEMA NEN Heat exchanger with water in both sides. There are 4 exchangers in series and so they are arranged like a 2 x 2 matrix. As the connections in the bottom exchangers comes laterally (from sides), we needed to rotate the partion plate 90deg for the flow alignment with the nozzles. We use 45% cut horizontal baffles in the shell side. My question is should we need to rotate the shell side baffles too inline with the partition plates? Attached picture would explain the issue better. Heating surface is 4 x 480m2. Shell ID is 1.1m.

 

I hope the problem is explained clear. My thiking is if we dont rotate the baffles aligning with the parition plate, there could be uneven heat trasnfer (shell & Tube side fluid) which could reduce the heat trasnfer coeffecient. Noramlly baffles are not inclined, they are horizontal or vertical? Could there be any issues with the inclined baffles?

 

Experts. I need your help!  Any further details requied please let me know. Thanks!

 

 

 Baffle orientation- Inclined.png   91.3KB   2 downloads

[Pilesar]

You do not 'need' to rotate the shellside baffles. My preference would be to try to make the horizontal cut baffles work. There may be inefficiencies due to low flow areas no matter what you choose. I think the rotated cut might be more inclined to collect sediment if you have dirty water. But you have the details and are best positioned to judge the design.

[MGS RN]

Hey,

 

Thank you very much for the feedback! Fluids are not that much sedimenting in this case.  Do you foresee any issues with Rotated Cut?  Thermally I feel rotated baffle are OK but mechanically would there be any issues like vibration or anything? Shell & tube side handles approximately 180kg/s flow. HEX dimensions (ID 1.1m, length 7.5m).