A forward feed triple effect evaporator is used to fed 13608 kg/hr of NaOH solution containing 10 wt% solute. The entering feed temperature is 37.8°C. It is to be concentrated to a 50% NaOH solution. The steam used to enter at 58.6 kPa gage. The absolute pressure in the vapor space of the third effect is 6.76 kPa. The heat transfer coefficient are U1=6246, U2=3407, and U3=2271 W/m²K. All effects must have the same area. Calculate the surface area and steam consumption

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A forward feed triple effect evaporator is used to fed 13608 kg/hr of NaOH solution containing 10 wt% solute. The entering feed temperature is 37.8°C. It is to be concentrated to a 50% NaOH solution. The steam used to enter at 58.6 kPa gage. The absolute pressure in the vapor space of the third effect is 6.76 kPa. The heat transfer coefficient are U1=6246, U2=3407, and U3=2271 W/m²K. All effects must have the same area. Calculate the surface area and steam consumption
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