A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water (Cp = 4180 J/kg ( (C) in the tubes from 20(C to 70(C at a rate of 4.5 kg/s. Heat is supplied by hot oil (Cp = 2300 J/kg ( (C) that enters the shell side at 170(C at a rate of 10 kg/s. For a tube-side overall heat transfer coefficient of 600 W/m2 ( (C, determine the heat transfer surface area on the tube side. Answer: 15 m2