Evaporation is to be used to concentrate 3000 kg/h of a 10% solution of naoh in water entering at 70°c to a product of 45% solids. a single effect evaporator requires 2595 kg/hr of steam, resulting in a steam economy of 0.9. saturated steam at 198.53 kpa (120°c) is to be used. a triple-effect evaporator is used to reduce the amount of steam, and the overall heat-transfer coefficient is 1500 w/(m2⋅k) in each evaporator. calculate the temperature (boiling point of the liquid) in each evaporator, the steam required (kg/h), the steam economy (kg water vaporized per kg steam used), and the heating surface area (m2) for each evaporator. assume the pressure in the third evaporator is a maximum of 5 kpa.