saturated steam at 1 atm with quality of 0.1 and mass flow rate of 12 kg/min is to be cooled to 80 c. cooling water at 15 c and 20 kg/min mass flow rate is available. determine the surface area required for a counter flow double-pipe heat exchanger if the mean overall coefficient of heat transfer is 400 w/m?. c, with cooling fluid is flowing in the annulus. also draw the temperature distribution of both hot and cold fluids along the heat exchanger axis (x axis).