# Be clear Problem 3 (60 Points). A 1-2 shell-and-tube heat exchanger must be designed to heat...

###### Question:

be clear
Problem 3 (60 Points). A 1-2 shell-and-tube heat exchanger must be designed to heat 2.5 kg/s of water from 15 to 85°C. The heating is to be accomplished by passing hot engine oil at a rate of 5.2 kg/s, which is available at 160°C, through the shell side of the exchanger. The oil is known to provide an average convection coefficient of 400 W/m2K on the outside of the tubes. Ten tubes passes the water through the shell. Each tube is 3 mm thick and diameter D-25 mm. The thermal conductivity is 120 W/mK, the cooling water side heat transfer coefficient is 3061 W/m? "K, a. Draw a schematic diagram of the process (5 points) b. What are the assumptions of designing a heat exchanger (5 Points) c. Draw the temperature profile. (10 points) d. Calculate the LMTD? (10 Points) e. What is the overall heat transfer co-efficient? (15 Points) f. How long must the tubes be to accomplish the desired heating? (15 Points) Hints: The Cp of engine oil at average temperature is C, -2350 J/kg K. A(Tn - Tc) 9 = = UAAT 11 T: 1.0 0.9 lis 0.8 Correction factor F 0.7 0.6 12-11 10 0.5 0.8 0.9 0.5 06 0.7 04 03 02 0 0.1 P-

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