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A forced - circulation triple - effect evaporator is fed 6 0 , 0 0 0 lb / h ( 2 7 , 2 1
A forcedcirculation tripleeffect evaporator is fed lbh kgh of a caustic soda solution at a temperature of deg F deg C The concentrated solution will contain NaOH. Saturated water vapor at lbfin atm abs is used as the heating vapor, and the condensation temperature of the vapor from the third effect will be deg F deg C The order of the effects is II III, I. Radiation and condensate subcooling are negligible. The overall coefficients corrected for boiling point elevation are given in Table Calculate a the heating surface required for each effect, assuming that the surfaces are the same for all effects; b the consumption of heating steam, and c the economy of such steam.
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