An aqueous solution at 15.5C, and containing 4% solids, is concentrated to 20% solids. A single effect evaporator with a heat transfer surface area of 37.2 m2 and an overall heat transfer coefficient of 2 KW/ m2 K is to be used. The steam is available at a pressure of 200 kPa and the evaporator operates under a pressure such that the boiling point of pure water is 60 C and the boiling point rise is 5C. If the feed enthalpy (hF), distillate enthalpy(hL) is: 65 kJ/ kg and 272 kJ/kg respectively. Take water Cp= 1.91 kJ/kg. C Calculate: 1. Amount of heat transfer. 2. The evaporator capacity (F) in kg/s. ( Feed mass flow ) 3. Steam economy.