Saturated steam at 0.14 bar condenses in a shell and tube heat exchanger (1-2) that contains 130 brass tubes, each with a length of 2 m per step. The tubes have internal diameters and external of 13.4 and 15.9 mm, respectively. Cooling water enters the tubes at 20C with an average velocity of 1.25 m/s. The heat transfer coefficient on the shell side is 13,500 W/m2K. Use the NTU method and calculate a) the global heat transfer coefficient Uo. b) the leaving temperature of the cooling water and the rate of vapor condensation.