. . In a chemical production plant, a solution of sodium hydroxide leaves a dissolver at 90C and is to be cooled to 30C, using cooling water. The flowrate of the caustic solution will be 10 000 kg/hr. The inlet and outlet temperatures of the cooling fluid are 20C and 40C respectively. The maximum pressure drop allowance is 170 kPa for each stream. Perform the thermal design calculations of a suitable 12 shell and tube heat exchanger for this duty under the design considerations listed below. Stream allocation: Caustic solution to tube side Assume counter-current flow configuration Use an estimated value of 550 W/m2K as overall heat transfer coefficient Use carbon steel (thermal conductivity 66 W/m.K) as tube materials with an outside diameter of 20 mm and tube wall thickness of 2 mm; Assume U = 550 W/m2 C Select standard tube length of 5 m; Assume tube sheet total thickness of 50 mm; Use 1.25 triangular pitch: Use a split-ring floating head type with a shell-tube bundle clearance of 60 mm; . % Choose 25% baffle cut. Use 20% of shell diameter as baffle spacing The physical properties for sodium hydroxide and water at mean temperature are provided in the Table 1: . . . . . Table 1: Streams physical properties Sodium hydroxide Water 30 4.187 Mean temperature ("C) 60 Specific heat (kJ/kg. "C) 3.845 Density (kg/m) 982 Thermal conductivity (W/m 0.65 C) 998.23 0.6 1 0.8 Viscosity (mNs/m?) 0.915 Fouling coefficient (W/m2C) 5000 3000 Note: verify that the exchanger overall transfer coefficient and total pressure drop are acceptable