Efficient Design of High flow rate Heat Exchanger

[fbn123]

Dear All,

Currently involved in a single phase shell and tube heat exchanger design but extreamly high flow rates. Due to space limitations, the size should be minimum. Only one HX should fulfil the requirements.
Flow rates are about 250 Kg/s.
Kindly give some guidelines. What i have already tried is as following:
increase in tube side passes and shell side as well (F type)
baffles spacing etc.

Thanks in advance...

 

[EdStainless]

High flow tube side or shell side?
I have seen S&T units with tubeside flow reaching 75 ft/sec (25m/s).
The erosion and flow stresses are very high, so both design details to minimize pressure drop and material selection are very important.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[fbn123]

Thanks for the response.
Actually both sides are at high flow rate. hot at 150kg/s and cold at 215 (250 is actually incorrect, as mentioned earlier).
Other problem is the temperature gradient between two fluids is very low i.e. around 14 oC .i.e the hot fluid at 46 and cold is 32.
so i want to reduce the size of HX in which i m feeling difficulty due to very low temperate gradient and high flows.

 

[fbn123]

Also cannot use finned tubes etc. and material choice is also limited to CS and SS.

 

[EdStainless]

If you have high shell side flow you will need lots of support to prevent vibration and minimal baffles to reduce pressure drop.
This leads toward a Phillips rod baffle or Brown Twisted tube style of unit.
And it is going to be SS.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube