For Brazed Fin Aluminum exchangers, no fouling factors are typically applied. Overdesign or excess surface area margins are typically requested by licensors of about 10-15%.
For shell and tube exchangers and air cooled exchangers, TEMA has widely accepted fouling factors for all the process...
Placing the CO compression stream on the shellside and the chilled water on the tubeside TEMA type AXU, AJU, or AHU exchangers are all good for minimal pressure drop. A TEMA type X-shell with multiple shellside inlet/outlet nozzles would be the most conservative design for min pressure drop...
Tube layout pattern can also address vibration concerns. Triangular layout places the tubes closer together than 90° layout. If you have a vibration prone design due to high shellside velocity, 90° or 45° can help protect against vibration.
HTRI is not a mechanical design program. HTRI program is focused on the thermal and hydraulic modeling of heat exchangers. HTRI does not have the option for seismic and/or wind loading. Saddles are not "designed" in the program and the estimated saddle locations is just that, an estimation...
To some degree you can throttle plate and frame exchangers to control the duty. They are designed for a minimum wall shear-stress value to achieve a high heat transfer coefficient and prevent fouling. Plate and frame exchangers are not designed with fouling factors nor do they allow for much...
DAO78,
You can use HTRI to design SRU (Sulfur Recovery Unit) WHB. However, as you mentioned, you must use it with caution. Typically with SRU WHB there are other parameters, such as the velocity range of the sulfur gas which must be considered. Most of the design criteria considered in SRU...
