A shell and tube heat exchanger with 2 shell passes and 12 tube passes is used to heat water (Cp = 4 180 J/Kg * ) in the tubes from 20 to 70 at a rate of 4.5kg/s Heat is supplied by hot oil ( Cp = 2300 J/Kg * ) entering the shell side at 170 at a rate of 10 kg/s. For a total heat transfer coefficient on the tube side of 350 W/m^2 * . Determine a) The effectiveness of the exchanger. b) The surface area of this transfer. c) the outlet temperature of the oil flow.