2) Crude oil at a flow rate of 63.77 kg/s enters the exchanger at 102°C and leaves at 65°C. The heat will be transferred to 45 kg/s of city water coming from a supply at 21°C. The exchanger data is given below: 3/4" OD, 18 BWG tubes on a 1 inch square pitch; 2 tube passes and 4 tube passes will be considered. Tube material is carbon steel. The heat exchanger has one shell. Two different shell diameters of ID 35 and 37 inches should be studied. Baffle spacing is 275 mm. Calculate the length of the heat exchanger for clean and fouled surfaces. Also calculate: a. Tube side velocity for 1-2 and 1-4 arrangements b. Overall heat transfer coefficients c. Pressure drops The allowable shell-side and tube-side pressure drops are 60 kPa and 45 kPa, respectively. The following properties are given: Specific heat, J/kg K Dynamic viscosity, N s/m2 Shell Side Tube Side 2177 4186.8 0.00189 Thermal conductivity, W/m K 0.122 0.00072 0.605 Density, kg/m³ 786.4 995 Prandtl number 33.73 4.98 Maximum pressure loss, Pa 60,000 45,000