A solution is to be concentrated from 10% to 65% solids in a vertical tube evaporator. The solution has a negligible elevation of boiling point and its specific heat can be taken same as that of water. Steam is available at 203.6 kPa and the condenser operates at 13.33 kPa. The feed enters the evaporator at 295 K. The total evaporation is to be 25000 kg/hr of water. Calculate the heat transfer area required and the steam consumption in kg/hr if overall heat transfer coefficient is 2800 W/m2.K.