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A triple-effect backward-feed evaporator concentrates 5 kg/s of liquor from 10 per cent to 50 per cent solids. Steam is available at 375 kN/m² and the condenser operates at 13.5 kN/m². What is the area required in each effect, assumed identical, and the economy of the unit? The specific heat capacity is 4.18 kJ/kg K at all concentrations and that there is no boiling-point rise. The overall heat transfer coefficients are 2.3, 2.0 and 1.7 kW/m² K respectively in the three effects, and the feed enters the third effect at 300 K.

A triple-effect backward-feed evaporator concentrates 5 kg/s of liquor from 10 per cent to 50 per cent solids. Steam is available at 375 kN/m² and the condenser operates at 13.5 kN/m². What is the area required in each effect, assumed identical, and the economy of the unit? The specific heat capacity is 4.18 kJ/kg K at all concentrations and that there is no boiling-point rise. The overall heat transfer coefficients are 2.3, 2.0 and 1.7 kW/m² K respectively in the three effects, and the feed enters the third effect at 300 K.

Introduction to Chemical Engineering Thermodynamics
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
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A triple-effect backward-feed evaporator concentrates 5 kg/s of liquor from 10 per cent to 50 per cent solids. Steam is available at 375 kN/m² and the condenser operates at 13.5 kN/m². What is the area required in each effect, assumed identical, and the economy of the unit? The specific heat capacity is 4.18 kJ/kg K at all concentrations and that there is no boiling-point rise. The overall heat transfer coefficients are 2.3, 2.0 and 1.7 kW/m² K respectively in the three effects, and the feed enters the third effect at 300 K.
Transcribed Image Text:A triple-effect backward-feed evaporator concentrates 5 kg/s of liquor from 10 per cent to 50 per cent solids. Steam is available at 375 kN/m² and the condenser operates at 13.5 kN/m². What is the area required in each effect, assumed identical, and the economy of the unit? The specific heat capacity is 4.18 kJ/kg K at all concentrations and that there is no boiling-point rise. The overall heat transfer coefficients are 2.3, 2.0 and 1.7 kW/m² K respectively in the three effects, and the feed enters the third effect at 300 K.
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