A forced-circulation triple-effect evaporator using forward feed is to be used to concentrated a 10 wt% NaOH solution entering at 37.8°C to 50%. The steam used enters at 58.6 kPa gage. The absolute pressure in the vapor space of the third effect is 6.76 kPa. The feed rate is 13 608 kg/h. The heat transfer coefficients are U1 = 6246, U2 = 3407, U3 = 2271 W/m2 -K. All effects have the same area. Calculate the surface area, steam consumption and steam economy.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A forced-circulation triple-effect evaporator using forward feed is to be used to concentrated a 10 wt% NaOH solution entering at 37.8°C to
50%. The steam used enters at 58.6 kPa gage. The absolute pressure in the vapor space of the third effect is 6.76 kPa. The feed rate is 13 608
kg/h. The heat transfer coefficients are U1 = 6246, U2 = 3407, U3 = 2271 W/m2 -K. All effects have the same area. Calculate the surface area, steam consumption and steam economy.

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