Shell and tube heat exchangers are widely used in process industries due to their large heat transfer area to volume ratio and mechanical robustness. They consist of tubes bundled together in a shell, with one fluid flowing inside the tubes and another outside in the shell. Key components include the shell, tubesheet, baffles, and tubes. Baffles divert shell-side flow across the tube bundle to enhance heat transfer and support the tubes. Kern's integral method is commonly used for shell-side thermal analysis, providing simple calculations of heat transfer coefficients and pressure drop based on experimental correlations. Design of shell and tube heat exchangers involves initial decisions on fluid allocation and geometry, followed by thermal and hydraulic analysis of the tube and