STION 1: A shell and tube heat exchanger is required to cool 27.0 kg/s of process fluid in the shell from 180C to 120C. The tube side fluid is heated from 80C to 105C. The fluid properties are as follows: Shell-Side stream Tube-Side stream Heat capacity (kJ/kgK) 2.55 2.85 Density (kg/m3) 745 805 Viscosity (Ns/m2) 5 10-4 5.5 10-4 Thermal conductivity (W/mK) 0.085 0.09 The following heat exchanger configuration is available: The maximum allowable shell-side pressure drop is 0.25 bar. 1.1 Determine the heat duty of the heat exchanger. (2) 1.2 Calculate the shell-side pressure drop and state whether the pressure drop is within the allowable limit. (9) 1.3 Re-calculate the shell-side pressure drop for a baffle spacing of 350 mm. (6) 1.4 Based on your answers for 1.2 and 1.3, discuss the effect of increasing the baffle spacing on the shell-side pressure drop. (3) [20] Shell inside diameter 700 mm Tube outside diameter 19.05 mm Tube inside diameter 17.5 mm Tube arrangement 25 mm square tube pitch Number of tubes 760 Tube length 4.88 m Baf