Example (2): A single effect evaporator is used to concentrate 5000 kg/h of solution of sodium hydroxide from 10% to 25% solids. Steam is available at 143.27KPa absolute; the vapor space is maintained at 62.745K Pa gage pressure. The feed enters at its boiling point corresponding to the vapor space pressure. Calculate: 1. The steam consumption per hour. 2. If the available heat transfer area is 35m estimate the heat transfer coefficient Take the specific heat capacity of vapor 1.8 kJ/kg K