2. A triple-effect evaporator with forward feed is evaporating a sugar solution with negligible boiling-point rise and containing 10 wt % solids to 35% solids. Saturated steam at 205 kPa abs is being used. The pressure in the vapor space of the third effect is 13.65 kPa. The feed rate is 25,000 kg/hr and the temperature 300 K. The liquid heat сараcity is The heat-transfer coefficients are U1 = 3,123, U2 = 1,987, and U3 = 1,136 W/m²·K. Calculate a. the surface area of each effect if each effect has the same area, b. the steam economy, Cp= 4.19 - 2.35 x, where cp is in kJ/kg K and x in weight fraction solids.
2. A triple-effect evaporator with forward feed is evaporating a sugar solution with negligible boiling-point rise and containing 10 wt % solids to 35% solids. Saturated steam at 205 kPa abs is being used. The pressure in the vapor space of the third effect is 13.65 kPa. The feed rate is 25,000 kg/hr and the temperature 300 K. The liquid heat сараcity is The heat-transfer coefficients are U1 = 3,123, U2 = 1,987, and U3 = 1,136 W/m²·K. Calculate a. the surface area of each effect if each effect has the same area, b. the steam economy, Cp= 4.19 - 2.35 x, where cp is in kJ/kg K and x in weight fraction solids.
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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Transcribed Image Text:2. A triple-effect evaporator with forward feed is evaporating a sugar solution with
negligible boiling-point rise and containing 10 wt % solids to 35% solids. Saturated
steam at 205 kPa abs is being used. The pressure in the vapor space of the third effect is
13.65 kPa. The feed rate is 25,000 kg/hr and the temperature 300 K. The liquid heat
сараcity is
The heat-transfer coefficients are U1 = 3,123, U2 = 1,987, and U3 = 1,136 W/m2.K.
Cp= 4.19 - 2.35 x, where cp is in kJ/kg:K and x in weight fraction solids.
Calculate
a. the surface area of each effect if each effect has the same area,
b. the steam economy.
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