A single-effect evaporator dissolves a solution containing 10% solids to 50% solids at a flow rate of 7 kg/s. used to concentrate. Heating is done with saturated steam at 198.5 kPa. and the condensed steam leaves the evaporator as a saturated liquid. Evaporation process 12.35 It takes place in kPa. The overall heat transfer coefficient is 3000 W/m2K. Solution feed temperature 294 K, specific heat capacity of 10% solution 3.76 kJ/kgK, specific heat capacity of 50% solution It is 3.14 kJ/kg K. The boiling point elevation (CNY) of the solution depends on the solution concentration. It is given by the equation KNY (oC)=10-1.2x.Caltulate:

a-The required amount of steam

b-Required heat transfer surface area

c-the Evaporator capacity

d-the steam economy