A triple-acting evaporator with direct current power must concentrate 15000 kg/h of an aqueous solution entering 25 C from 10% to 40% by weight. For the heating is available live steam at 2.2 at, and on the third effect a vacuum is maintained that allows the solution to boil at 30ºC. The dissolution does not present an appreciable increase in the point of boiling and its specific heat is equal to the unit for all concentrations. The integral heat transmission coefficients for effects I, II, III, in Kcal/m2*h*ºC, they are worth 2800, 2500 and 1600. Apply to each effect: a) Hourly consumption of heating steam b) Boiling temperature c) The heating surface.

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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Chapter1: Introduction
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A triple-acting evaporator with direct current power must concentrate 15000 kg/h of an aqueous solution entering 25 C from 10% to 40% by weight. For the heating is available live steam at 2.2 at, and on the third effect a vacuum is maintained that allows the solution to boil at 30ºC. The dissolution does not present an appreciable increase in the point of boiling and its specific heat is equal to the unit for all concentrations. The integral heat transmission coefficients for effects I, II, III, in Kcal/m2*h*ºC, they are worth 2800, 2500 and 1600. Apply to each effect: a) Hourly consumption of heating steam b) Boiling temperature c) The heating surface.
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