A forward feed triple effect evaporator is used to fed 13608 kg/hr of NaOH solution containing 10 wt% solute entering the feed at 37.8 °C temperature. 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. (no BPR at 1st and 2nd effect)

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