A single effect evaporator is used to concentrate a solution from 10% solids to 50% solids at a flow rate of 7 kg/s. Heating is done with saturated steam at 198.5 kPa and the condensed steam leaves the evaporator as saturated liquid. Evaporation takes place at 12.35 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 is given by the equation KNY (oC)=10-1.2x, depending on the solution concentration.

a) The required amount of steam,

b) Required heat transfer surface area,

c) Evaporator capacity

d) Steam economy calculate.