In a tubular heat exchanger of the steam-water type, dry and saturated water vapor whose pressure is P = 3.5 x 105 Pa, condenses on the outer surface of the tubes. The water, which circulates through the tubes, is heated from 20C to 90C. Determine: a) The steam flow rate in the steam-water exchanger if the water flow rate is 8 L/h. Assume no condensate subcooling (15 points) b) The effectiveness of the exchanger (10 points) c) The heat exchange area, if the overall heat transfer coefficient is 250 W/m2K (10 points)