A solution of organic colloids in water is to be concentrated from 8 to 45 percent solids in an evaporator. Steam is available at 120 C. A pressure of 102 mmHg abs is to be maintained in the vapor space. The feed rate to the evaporator is 2000 kg/hr at 51.7 C. If the product is collected at 353 K and the overall heat transfer coefficient is 2605.12 W/m^2 C. Calculate the BPE and the heat transfer area required.