QUESTION 1 (14 marks) It is required to cool to 30C, in a counter-flow 1-2 heat exchanger, an oil whose initial temperature, flow rate and heat capacity are 100C,5,000kg/h and 2,100J/kgK. respectively. The other fluid is water entering the exchanger at 15C with a flow rate of 10,332kg/h. If the overall heat transfer coefficient of the exchanger is 300W/m2K, determine: a) the outlet temperature of the water if the heat capacity of water is 4184J/kgK (2marks) (CO3/PO3/C4) b) the required numbers of the tubes, and the length of each tubes if the average velocity of water in the tube are 0.89m/s and the diameter of the tube is 2cm. ( 6 marks) (CO3/PO3/C4) c) the new numbers of the tubes, and the length of each tubes if the configuration of the heat exchanger is change to 2 shell passes and 4 tubes passes. (4marks) (CO3/PO3/C4) d) Based on the answer from question 1 (c), estimate the new heat transfer if fouling is being considered in the heat exchanger. Given the heat transfer coefficients 750W/m2K for both fluid and a fouling factor of 8.81105m2K/W. (2marks) (CO3/PO3/C4)