QUESTION 4: 6.25kg/s flow rate of a gas oil is to be cooled from 200C to 40C. The temperature of coolant fluid (wator) at tube side is avalable at 30C and temperature rise is to be limited to 20C. Alowance should be made for fouling by including a fouling factor of 0.0002(W/m2 "C)" for gas oil and 0.00025(WWm2 "C)" for cooling water tower. Thermal conductivity for tube material is 45WhmC. The heat exchanger conflgurations are: - Use pull-through, floating head exchanger. - Tube side: Use 20mm outside diameter, 16mm inside diameter, 4m long tubes. triangular pitch (1.25d0) carbon steel. - 1 shell pass, 4 tube passes. - Assume the overall heat transfer coefficient is 500Wm2C - Bundle diameter is 0.575m and shell diameter is 0.687m. - Shell side heat transfer coefficient is 1967Wim2CC. - Shell side: Use segmental bafle with 25% cut, Bafle spacing =1/5 shell diameter - Viscosity correction is negligible. hys inal mmnentias of water and gas oil is given in the belaw tabies. Physical propertien the MoGmen-1 From the data gtven, design a shell and tube exchanger by determne a) Heat transfer area b) Tube side heat Iransfer contficient c) Overal heat transfer coefficient and validate the calculated value with the a5sumted value. ( 5 marks)