A shell and tube heat exchanger as Figure 2 has 390 tubes (k = 54 W/m-K). The length of each tube pass in the heat exchanger is 3 m. Water (cp = 4180 J/kg-K) enters the tubes at 10 kg/s and oil (n = 2100 J/kg-K) flows through the shell at 4 kg/s. The convection heat transfer coefficient for the water is 470 W/mK and for the oil is 120 W/mK. During the operation, deposits with fouling coefficient of 11350 W/mK and 1990 W/mK have developed on the inside and on the outside, respectively. By assuming the flow arrangement is in counter flow, answer the following. a) Determine the overall heat transfer coefficient of this heat exchanger based on the inner surface area of the tubes. 17 Marks CO3, PO3, C31 b) Determine the heat transfer rate in the heat exchanger. 111 Marks CO3, PO3, C4) c) An engineer suggests to double the heat transfer area so that the heat transfer rate will be doubled. Evaluate this suggestion to show if the heat transfer rate would increase doubles. 17 Marks CO3, PO3, C41 NT o Oil, 240C A shell and tube heat exchanger as Figure 2 has 390 tubes (k = 54 W/m-K). The length of each tube pass in the heat exchanger is 3 m. Water (cp = 4180 J/kg-K) enters the tubes at 10 kg/s and oil (n = 2100 J/kg-K) flows through the shell at 4 kg/s. The convection heat transfer coefficient for the water is 470 W/mK and for the oil is 120 W/mK. During the operation, deposits with fouling coefficient of 11350 W/mK and 1990 W/mK have developed on the inside and on the outside, respectively. By assuming the flow arrangement is in counter flow, answer the following. a) Determine the overall heat transfer coefficient of this heat exchanger based on the inner surface area of the tubes. 17 Marks CO3, PO3, C31 b) Determine the heat transfer rate in the heat exchanger. 111 Marks CO3, PO3, C4) c) An engineer suggests to double the heat transfer area so that the heat transfer rate will be doubled. Evaluate this suggestion to show if the heat transfer rate would increase doubles. 17 Marks CO3, PO3, C41 NT o Oil, 240C