With a flow rate of 1.25 kg/s, a solution is evaporated using water vapor at 393 K (0=2211kJ/kg) in a single-effect evaporator until it contains 10% to 41%. Evaporation develops at a pressure of 13.5 kN/m2 (T=325 K 1=2277kJ/kg). KNY is neglected. Steam does not carry solvents and there is no heat loss by radiation. The supply temperature is taken as 291 K, Cp 4.0 and the overall heat transfer coefficient 1.25 kW/m2 K. Find the surface of the required information and the required water vapor charge that should be in the steam cabin