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An aqueous solution of a solute is concentrated from 5% to 20% (mass basis) in a single- effect short-tube evaporator. The feed enters the evaporator at a rate of 10 kg/s and at a temperature of 300 K. Steam is available at a saturation pressure of 1.3 bar. The pressure in the vapor space of the evaporator is 0.13 bar and the corresponding saturation temperature of steam is 320 K. If the overall heat transfer coefficient is 5000 W/(m2.K), calculate the (a) steam economy (b) heat transfer surface area. Enthalpy (kJ/kg) Heat of vaporization (kJ/kg) Saturated steam (1.3 bar; 380 K) Saturated steam (0.13 bar; 320 K) Feed (5% ; 300 K) Concentrated liquor (20% ; 325 K) Boiling point elevation is 5 K. 2000 2200 80 400

An aqueous solution of a solute is concentrated from 5% to 20% (mass basis) in a single- effect short-tube evaporator. The feed enters the evaporator at a rate of 10 kg/s and at a temperature of 300 K. Steam is available at a saturation pressure of 1.3 bar. The pressure in the vapor space of the evaporator is 0.13 bar and the corresponding saturation temperature of steam is 320 K. If the overall heat transfer coefficient is 5000 W/(m2.K), calculate the (a) steam economy (b) heat transfer surface area. Enthalpy (kJ/kg) Heat of vaporization (kJ/kg) Saturated steam (1.3 bar; 380 K) Saturated steam (0.13 bar; 320 K) Feed (5% ; 300 K) Concentrated liquor (20% ; 325 K) Boiling point elevation is 5 K. 2000 2200 80 400

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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An aqueous solution of a solute is concentrated from 5% to 20% (mass basis) in a single- effect short-tube evaporator. The feed enters the evaporator at a rate of 10 kg/s and at a temperature of 300 K. Steam is available at a saturation pressure of 1.3 bar. The pressure in the vapor space of the evaporator is 0.13 bar and the corresponding saturation temperature of steam is 320 K. If the overall heat transfer coefficient is 5000 W/(m2.K), calculate the (a) steam economy (b) heat transfer surface area. Enthalpy (kJ/kg) Heat of vaporization (kJ/kg) Saturated steam (1.3 bar; 380 K) Saturated steam (0.13 bar; 320 K) Feed (5% ; 300 K) Concentrated liquor (20% ; 325 K) Boiling point elevation is 5 K. 2000 2200 80 400
Transcribed Image Text:An aqueous solution of a solute is concentrated from 5% to 20% (mass basis) in a single- effect short-tube evaporator. The feed enters the evaporator at a rate of 10 kg/s and at a temperature of 300 K. Steam is available at a saturation pressure of 1.3 bar. The pressure in the vapor space of the evaporator is 0.13 bar and the corresponding saturation temperature of steam is 320 K. If the overall heat transfer coefficient is 5000 W/(m2.K), calculate the (a) steam economy (b) heat transfer surface area. Enthalpy (kJ/kg) Heat of vaporization (kJ/kg) Saturated steam (1.3 bar; 380 K) Saturated steam (0.13 bar; 320 K) Feed (5% ; 300 K) Concentrated liquor (20% ; 325 K) Boiling point elevation is 5 K. 2000 2200 80 400
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