The engineering task
Two fluids with a large temperature difference exchange heat in a shell-and-tube unit. A fixed-tubesheet construction would generate high differential-expansion forces, so a U-tube arrangement is considered. It accommodates expansion but complicates mechanical cleaning and creates different tube lengths and bend radii.
Thermal design, tube layout, minimum bend radius and tubesheet must be developed together. Shell-side crossflow can excite vibration, particularly near U-bends. Pressure drop, cleanability and bundle removability matter alongside surface area.
Required design data
- Fluid rates and complete temperature programme
- Pressure-drop limits and fouling requirements
- Tube material, diameter and minimum bend radius
- Cleaning, maintenance and bundle-removal requirements
Technical solution approach
Justify the construction
Compare fixed, floating-head and U-tube designs for differential expansion, cleaning and operating cases.
Size thermal area
Use temperature programme, transfer and fouling to determine area, tube length and passes.
Develop U-tube bundle geometry
Set tube layout, bend radii, clearances and effective lengths for fabrication.
Check hydraulics and vibration
Assess tube- and shell-side pressure drop plus fluid-elastic and vortex-induced vibration.
Verify tubesheet and pressure parts
Calculate U-tube tubesheet, shell, heads and flanges using final geometry.
Expected deliverables
Suitable SOL ALPHA modules
The modules form a technically plausible toolchain. Their final selection and sequence will be confirmed during the later calculation against the applicable code and project conditions.